JPH0522703A - Device for correcting characteristic - Google Patents

Abstract

PURPOSE:To immediately obtain a satisfactorily reproduced picture and also to correctly operate level correction by updating level correction information through the use of reference data obtained by means of a reproduction video signal and level-corrcting the reproduction video signal. CONSTITUTION:A reference pulse and pulse height data for identifying it are inserted within one horizontal period in the vertical blanking period of a recording video signal by a gate pulse generating means 1, a reference pulse generating means 2, pulse hight data generating means 3 and a reference data inserting means 4. A reference signal generating and inserting means 10 generates a reference signal having a quantization level and inserts it within the succeeding one horizontal period of the horizontal period where the reference pulse and pulse height data in the vertical blanking period of the recording video signal are inserted. Then, an output where the reference pulse, pulse height data and the reference signal are inserted is recorded. When reproduction starts or reproduction changes from variable-speed one to normal one, the reproduction video signal is level-corrected through the use of the reference signal obtained from the reproduction video signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a characteristic correction device for a signal recording / reproducing device, which automatically corrects distortion caused by non-linearity of a signal processing system during recording and reproduction, and reproducing signal level. Is.

[0002]

2. Description of the Related Art In a signal recording device such as a VTR, one method for recording a wide band signal is to divide one signal into a plurality of channels to reduce the bandwidth required for each channel. There is a channel division recording method for recording. In such a system, if the recorded signal is a television signal, the signal is set to 1
A method is used in which the signals are divided for each horizontal scanning time and distributed to a plurality of channels, and the distributed signals are time-axis expanded and recorded.

FIG. 47 is a diagram showing an example of a recording method of this channel division recording method. In this example, the input video signal is distributed to the two channels A and B. FIG. 47 (a) shows the input signal, and the numbers in the order of time are given as H1, H2, H3, ... For each horizontal scanning period. The input signal is channel A and channel B for each horizontal scanning line.
47 and the time axis extension.
It is converted into the form of the recording signal shown in (b).

When the signals are expanded on the time axis by dividing the channels in this way, the band for each channel decreases, but since one signal is recorded and reproduced by two systems, characteristics between channels are reduced. If there is a difference, in the above example, the reproduction line image quality is deteriorated, for example, the scanning lines are conspicuous. Therefore, a device that automatically corrects the characteristic difference between channels is required.

An example of the configuration of a conventional characteristic correction device used in a VTR that records and reproduces data by dividing the channel as described above is "90 ITE Lecture Proceedings: Correction of Characteristic Difference Between Channels of Multi-Channel Recording VTR". , P.111 to p.112
Is shown. FIG. 42 is a block diagram showing the configuration of this apparatus. FIG. 42 (a) shows the recording system thereof.
(b) shows the regeneration system.

In FIG. 42 (a), 1 is a gate pulse generating means for generating a gate pulse by separating horizontal and vertical synchronizing signals from a recorded video signal, and 2 is at least a black level to a white level of the recorded video signal according to the gate pulse. A reference pulse generating means for generating a pulse having a height corresponding to a pulse height data generating means for generating pulse height data which is quantized data corresponding to the reference pulse in accordance with the gate pulse, and 4 a reference pulse and a pulse. The reference data inserting means inserts height data into the vertical blanking period of the recorded video signal indicated by the gate pulse.

Further, in FIG. 42 (b), 5 is a reproduction A / D converter for A / D converting the reproduction video signal, 6 is pulse height data selecting means for selecting pulse height data from the reproduction video signal, Reference numeral 7 is a reference pulse selecting means for selecting the reference pulse data inserted at the time of recording from the output data of the reproducing A / D converter 5, and 8 is output data of the reference pulse selecting means 7 and pulse height data selecting means 6. And a reproduction D / A for converting the level-corrected reproduction video signal to D / A.
It is a converter. The gate pulse generating means 1 can be the same one for the recording system and the reproducing system, but it is of course possible to use another circuit which operates exactly the same.

Next, the operation will be described with reference to FIGS. 42 to 46. Here, it is assumed that the recorded video signal is quantized by 8 bits. Gate pulse generation means 1 during recording
Separates the vertical and horizontal sync signals from the recorded video signal (see FIG. 43 (a)). Then, a gate pulse GP (see FIG. 43 (c) and FIG. 44 (a)) which becomes high in one horizontal period after three horizontal periods is generated from the vertical synchronizing signal (see FIG. 43 (b)).

The reference pulse generating means 2 is a gate pulse GP.
Goes high, it generates a reference pulse RP having a high quantization level of 0/225. The pulse height data generating means 3 generates pulse height data HD which is quantized data in serial format corresponding to a reference pulse having a quantization level height of 0/225. After that, each time the gate pulse becomes high, the reference pulse generating means 2 causes the reference pulse RP
Generated by increasing the quantization level of 1 by 1 (1/225, 2/225, ..., 254/255, 2
55/255), the quantization levels of all recorded video signals are generated. The pulse height data generating means 3 generates pulse height data HD corresponding to the reference pulse RP which increases by one quantization level each time the gate pulse GP becomes high. Pulse height data H corresponding to the reference pulse RP
D is used as the reference data RD (see FIG. 44 (b)), and the reference data insertion means 4 sets the reference data RD in the vertical blanking period.
Is inserted to obtain an output signal as shown in FIG. This output signal is recorded through the recording system circuit.

At the time of reproduction, for example, a reproduced video signal which has been distorted and contracted near the white level is A / D converted by the reproduction A / D converter 5. At the same time, the reproduction gate pulse G synchronized with the reproduction video signal including the time base fluctuation by the gate pulse generation means 1
P is generated (see FIG. 46 (a)). In accordance with the reproduction gate pulse GP, the reference pulse selection means 7 is distorted from the output data of the reproduction A / D converter 5 to change its height (D
Reproduction reference pulse RRP (reduced by 1, D2) (Fig. 46)
(see (b)), and the pulse height data selecting means 6 obtains reproduction pulse height data RHD from the reproduction video signal for identifying the pulse height at the time of recording (see FIG. 46 (c)).

Next, in the level correction means 8, for example, the pulse height data HD corresponding to all the reproduction reference pulse RRP data as addresses is written in the memory to create a level correction table, and the reproduction A / A is reproduced in the normal video period.
Performs level correction operation such as reading a value from the level correction table using the output data of the D converter 5 as an address,
When the reference pulse and the pulse height data inserted at the time of recording are removed and then D / A converted by the reproduction D / A converter 9, a level-corrected reproduced video signal is obtained.

An example of the configuration of a second conventional characteristic correction device used in a VTR that records and reproduces data by dividing the channel as described above is described in "Kiyoshi Sasaki et al .: Band compression type high definition VTR, National Technical Report Vol.32, No.4 ”. FIG. 50 is a block diagram showing the configuration of this device. In FIG.
Is a memory for storing a reproduction lamp signal, 64 is an arithmetic mean and check circuit for performing arithmetic mean and checking of the reproduction ramp signal, 65 is a level correction table memory, 66 is a reference ramp signal data memory, 67 is a data processing circuit, 68
Is a switch for switching the address, 69 is a reproduction signal input terminal, 70 is a reproduction lamp signal input terminal, 71 is a time axis data terminal, and 72 is a correction output terminal.

The second conventional characteristic correction device is configured as described above, and records the ramp signal changing from the black level to the white level within the vertical blanking period of the video signal and reproduces it. The recording level and the reproduction level are associated with each other. And FIG.
When the ramp waveform shown in (a) is recorded, if a distorted waveform is obtained as the playback signal as shown in FIG. Is corrected and the timing is matched with the ramp signal at the time of recording, so that the input signal level and the reproduction output level are associated with each other.

To explain this operation in detail, the reproduction ramp signal is first input to the arithmetic mean and check circuit 11,
Here, a plurality of reproduction lamp signals are added to improve the S / N, and the shape of the addition-averaged reproduction lamp signals is checked to remove the influence of dropout or the like. The reproduction ramp signal whose averaging and shape have been checked uses the reproduction axis data memory 6 with the time axis data as an address.
3 is stored. Next, the data and address of the reproduction lamp data memory 63 are reversed to each other and stored in the level correction table memory 65. The shape of the ramp signal at the time of recording is stored in the reference ramp signal data memory 66. If reproduced video signal data is given as an address of the level correction table memory 65 via the switch 68, the address of the reference ramp signal data memory 66 is stored. Is obtained, and video signal data whose level is corrected to match the output of the reference ramp signal data memory 66 is obtained.

[0015]

Since the conventional characteristic correction device is configured as described above, when the level correction information is newly created, such as when starting reproduction or when shifting from variable speed reproduction to normal reproduction. In addition, it takes time to obtain the reference data corresponding to all video signal levels, and during that time, since the level correction is performed by the level correction information that is not based on the current reproduction state, it is impossible to obtain a good reproduced image. was there.

Further, since the conventional characteristic correction device is constructed as described above, for example, n sets (n = 1, 2, 3, ...) Of two heads are mounted 180 degrees opposite to the rotary drum, 1 field or 1 frame of video signal mx
When a characteristic correction device such as the above-mentioned conventional example is used in a video signal recording device (hereinafter referred to as VTR) which is divided into n (m is an odd number) tracks for recording and reproduction, reproduction is performed by both heads. Since the level correction table is created from the pulse height data corresponding to the reference pulse, the characteristic difference between the heads cannot be corrected if there is a characteristic difference between the 2n heads. there were.

Further, since the conventional characteristic correction device is configured as described above, when the reproduction is performed at a speed different from the normal reproduction speed, the characteristics change depending on the reproduction speed, and at the time when the reproduction speed changes, a good level correction can be made. There was a problem that it could not be done. For example, forward search (hereinafter referred to as FS)
At times, since the relative speed during reproduction is lower than the relative speed during recording, the frequency of the reproduced FM signal becomes lower in the case of FM recording, and the demodulated reproduced video signal level becomes relatively lower than that during normal reproduction. . Further, during reverse search (hereinafter referred to as RS), the relative speed at the time of reproduction becomes higher than the relative speed at the time of recording, and thus the reproduced video signal level also becomes higher. In this way, the characteristics greatly change depending on the reproduction speed. Therefore, in the period immediately after shifting from normal playback to variable speed playback or from variable speed playback to normal playback, the level correction information corresponding to the previous playback speed is gradually updated with the reference data obtained at the current playback speed, and the current playback speed is updated. Since the corresponding level correction information is obtained, a reproduced image that has undergone good level correction cannot be obtained during that period.

Further, since the conventional correction device is configured as described above, for example, when the video signal is divided into two channels and the video signal of one field is recorded on two tracks, the reference data is different from each other. It is inserted in the vertical blanking period of the video signal of the channel, but when it is reproduced at a speed different from the normal reproduction speed, the reproduction head locus as shown in FIG. 38 is obtained, and the value of the reference data is obtained from the reproduction video signal. Since it can only be obtained at random intervals, the value of certain reference data may remain unobtainable. For this reason, there has been a problem that the reproduction image quality is deteriorated by the level correction during variable speed reproduction.

Further, since the conventional characteristic correction device is constructed as described above, it has the following problems. For example, when the height of the reference pulse is at the black level and the white level, the reproduced signals are affected by the sag, respectively.
, (B) tends to occur. This is because the average level of the video signal is almost the gray level, but the average level of the reference data is almost the quantization level of the reference pulse, and the influence of sag appears. As described above, the reference data composed of the pulse height data corresponding to the reference pulse having a certain time width is easily affected by the sag. Further, since the influence of the sag of the reproduced reference data differs depending on the value of the reference pulse, the characteristics of the level change of the recorded / reproduced video signal and the level change of the reference data are different, and a good correction operation cannot be performed. . In particular, the characteristics greatly differ near the maximum or minimum level of the video signal.

Further, in the case of the second conventional example, unlike the case of the first conventional example, characteristic correction signals corresponding to all video signal levels can be obtained even during variable speed reproduction. However, since the time axis changes depending on the reproduction speed during variable speed reproduction, the length of one horizontal period and the reproduction signal level change.
Fig. 52 (a) shows the characteristic correction signal (ramp waveform) during normal playback, and Fig. 52 (b) shows the case when it is higher than the normal playback speed.
FIG. 52 (c) shows the case where the reproduction speed is lower than the normal reproduction speed. There is a problem in that the levels at the time of recording and at the time of reproducing cannot be accurately associated from such a reproduced characteristic correction signal.

The present invention has been made to solve the above-mentioned problems, and when a new level correction information is created, a good reproduced image can be instantly obtained and the level correction operation can be performed correctly. It is an object to obtain a characteristic correction device that can be performed.

Another object of the present invention is to provide a characteristic correction device which does not need to newly use an area in a recorded video signal for recording a reference signal in addition to the above object. In addition, the present invention corrects the characteristics between the heads,
An object of the present invention is to obtain a characteristic correction device that provides a good reproduced image. Further, according to the present invention, the level correction operation can be properly performed during the normal reproduction and the variable speed reproduction, and a reproduced image with an excellent level correction can be instantly obtained even after shifting from the variable speed reproduction to the normal reproduction or from the normal reproduction to the variable speed reproduction. The purpose is to obtain a characteristic correction device. It is another object of the present invention to provide a characteristic correction device that does not cause deterioration of reproduced image quality due to level correction during variable speed reproduction. Another object of the present invention is to reduce the occurrence of sag and minimize the difference between the characteristics of the reference data and the video signal due to the influence of the sag to obtain a characteristic correction device that produces a good reproduced image. Further, according to the present invention, the level correction operation can be correctly performed during normal reproduction, the characteristic correction operation does not cause deterioration of reproduction image quality during variable speed reproduction, and further, the variable speed reproduction is switched to the normal reproduction, and the contents of the correction table are updated. An object of the present invention is to obtain a characteristic correction device capable of reproducing a good reproduced image even during a period.

[0023]

A characteristic correction device according to the present invention comprises a reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and the reference pulse. Pulse height data generating means for generating pulse height data for identifying the value of, and a set of reference data consisting of a predetermined number of reference pulses and pulse height data corresponding to the predetermined number of reference pulses. Reference data inserting means to be inserted within the blanking period of the recorded video signal, and a reference signal having a level near the minimum and maximum levels of the recorded video signal or near the black level and the white level are inserted into the recorded video signal. It is obtained from the reference signal insertion means and the reproduced video signal when the level correction information is newly created such as when the reproduction is started or when the variable speed reproduction is changed to the normal reproduction. Calculating a level correction information using the quasi-signals, in which to update the level correction information using reference data obtained from further regeneration video signals, provided the level correction means for level correction of the reproduced video signal.

Further, the characteristic correcting apparatus according to the present invention includes a reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and a pulse for identifying the reference pulse. A pulse height data generating means for generating height data, and a set of reference data consisting of a plurality of reference pulses and pulse height data corresponding to the reference pulses Reference data insertion means to be inserted during the blanking period, level correction means to correct the level of the reproduced video signal for each head using the reference data obtained from the video signal reproduced by each head, and the level correction means to be reproduced by each head. A correction means switching means for allocating the reference data to the level correction means of each head is provided.

Further, the characteristic correction device according to the present invention includes the reference pulse generating means for generating the reference pulse corresponding to at least the black level to the white level of the recorded video signal, and the pulse for discriminating the predetermined number of reference pulses. Pulse height data generating means for generating height data, reference data inserting means for inserting pulse height data corresponding to a predetermined number of reference pulses as reference data within a blanking period of a recorded video signal, and at least normal reproduction The level correction information corresponding to the time, FS, and RS is created, and the level correction information corresponding to the normal reproduction is created with reference data obtained from the video signal at the normal reproduction. Similarly, the correction information at the FS is F
Reference data for S is created, and level correction information for RS is R
Level correction means is provided for performing level correction of a video signal reproduced at each reproduction speed and reproduced at each reproduction speed by using level correction information corresponding to the reproduction speed.

Further, the characteristic correction device according to the present invention includes the reference pulse generating means for generating the corresponding reference pulse of at least the black level to the white level of the recorded video signal and the pulse height for discriminating the predetermined number of reference pulses. Data for generating pulse height data, reference data using pulse height data corresponding to a predetermined number of reference pulses as reference data, and reference data inserting means for inserting during the blanking period of the recorded video signal, and reproduction during normal reproduction Level correction information is created using the reference data obtained from the video signal, the level of the playback video signal is corrected based on this level correction information, and the level correction information during normal playback and the current playback speed during variable speed playback Level correction that uses the level correction information calculated from the above to perform level correction and retains the corresponding level correction information during normal playback It is provided with a and the stage.

Further, the characteristic correcting apparatus according to the present invention distinguishes the reference pulse from the reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least the black level to the white level of the recorded video signal. A pulse height data generating means for generating pulse height data, and a plurality of reference pulses and reference pulse height data corresponding to the reference pulses so that the average level of the reference data is almost equal to the gray level of the video signal. Reference data insertion means for inserting the data into the blanking period of the video signal and level correction means for correcting the level of the reproduced video signal using the reference data obtained from the reproduced video signal are provided.

Further, the characteristic correcting device according to the present invention is obtained from the correction signal generating means for generating the correction signal, the correction signal inserting means for inserting the correction signal into the recorded video signal, and the reproduced video signal. A level correction means for correcting the level of the reproduced video signal using the correction signal is provided. An update prohibition means for prohibiting update of the correction information is provided.

Further, the characteristic correcting apparatus according to the present invention includes a reference pulse generating means for generating a reference pulse corresponding to at least a black level to a white level of a recorded video signal, and a pulse for identifying a predetermined number of reference pulses. A pulse height data generating means for generating height data, a reference data inserting means for inserting the pulse height data corresponding to a predetermined number of reference pulses as reference data into a blanking period of a recorded video signal, and a normal reproduction. Sometimes level correction information is created using reference data obtained from the reproduced video signal, and the reproduced video signal is level-corrected based on the level correction information.
In the variable speed reproduction, level correction means for correcting the level of the reproduced video signal by using the level correction information obtained in advance according to the reproduction speed and holding the level correction information in the normal reproduction is provided.

[0030]

According to the present invention, the reference pulse corresponding to each level of the recorded video signal, the height data for identifying the reference pulse, and the levels near the minimum and maximum levels of the recorded video signal or near the black level and the white level are set. Inserting a reference signal that exists, into the blanking period of the recorded video signal, when creating new level correction information, create the level correction information using the reproduced reference signal, and then reproduce this level correction information. The level correction information is sequentially updated using the reference pulse and pulse height data obtained from the video signal, and the playback video signal is level-corrected, so when starting playback or shifting from variable speed playback to normal playback Even in such a case, a good reproduced image can be instantly obtained.

Further, in the present invention, n heads (n = 1, 2,
3, ...) Mounting, in a VTR in which a video signal of one field or one frame is divided into n × m (m is an odd number) tracks for recording and reproducing, each head corresponds to all video signals. Since the reference data is stored and the level is corrected for each head by using the reference data obtained from the video signal reproduced by each head at the time of reproduction, the characteristic difference of each head is corrected to achieve good reproduction. Images can be obtained.

Further, in the present invention, level correction information corresponding to at least normal reproduction, FS and RS is provided, and created using only reference data obtained at the reproduction speed corresponding to each level correction information. Since it is configured to be updated, each level correction information is not updated by the reference data obtained at other reproduction speeds and is maintained during other reproduction speeds, so that it is good for normal reproduction and variable speed reproduction. Level correction can be performed, and good level correction can be instantaneously performed even if the reproduction speed changes.

Further, according to the present invention, level correction information is created using reference data obtained from the reproduced video signal during normal reproduction, and the reproduced video signal is level-corrected based on the level correction information. The level correction information for the normal playback just before the playback and the current playback speed are used to calculate the level correction information for the playback speed, and the playback video signal is level-corrected based on the level correction information. Since the level correction information for normal reproduction is held, good level correction can be performed during normal reproduction and variable speed reproduction, and good level correction can be instantaneously performed even if the reproduction speed changes.

Further, in the present invention, pulse height data corresponding to a plurality of reference pulses is used as reference data,
Since the average value of the plurality of reference pulses is set to the gray level of the video signal, the influence of sag is reduced,
The characteristics of the reference data and the video signal become substantially equal, which allows the level to be corrected accurately.

Further, in the present invention, during normal reproduction, the level correction means performs level correction by using the correction signal from which the reproduced video signal is obtained, and during variable speed reproduction, the update prohibiting means prohibits updating of the level correction information. However, since the level correction information of the immediately preceding normal reproduction is held, the characteristic correction signal cannot always be obtained, and it is good even during variable speed reproduction when the frequency of the reproduction signal is different from that during normal reproduction. A reproduced image can be obtained.

Further, according to the present invention, level correction information is created using reference data obtained from the reproduced video signal during normal reproduction, and the reproduced video signal is level-corrected based on the level correction information, and during variable speed reproduction. Since the level of the reproduced video signal is corrected using the level correction information that is obtained in advance according to the playback speed, and the level correction information during normal playback is retained, a good level is achieved during both normal playback and variable speed playback. Correction can be performed, and good level correction can be instantaneously performed even if the reproduction speed changes.

[0037]

1 is a block diagram showing the structure of a characteristic correcting apparatus according to an embodiment of the present invention. FIG. 1 (a) shows its recording system and FIG. 1 (b) shows its reproducing system. In these figures, the same reference numerals as those in FIG. 42 are the same or corresponding parts. Reference numeral 10 is a reference signal creating / inserting means for creating a reference signal so that there are levels near the minimum and maximum levels of the recorded video signal or near the black level and the white level, and 11 is inserted into the recorded video signal. It is a reference signal selection means for selecting the data of the reference signal inserted at the time of recording from the output data of the / D converter 5.

Next, the operation will be described with reference to FIGS. In the recording system shown in FIG. 1 (a), the gate pulse generating means 1, the reference pulse generating means 2, the pulse height data generating means 3, and the reference data inserting means 4 are used to perform the reference pulse and the reference pulse in the same manner as in the conventional example. The pulse height data for identifying is inserted in one horizontal period of the vertical blanking period of the recorded video signal. The reference signal creation / insertion means 10 creates a reference signal having a quantization level of 0/225 and 255/255 as shown in FIG. 2, and the reference pulse and pulse height data in the vertical blanking period of the recorded video signal. Is inserted within one horizontal period following the horizontal period in which was inserted. Thus, as shown in FIG. 3, the output signal in which the reference pulse, the pulse height data, and the reference signal are inserted is recorded through the recording system circuit.

At the time of reproduction, in the reproduction system shown in FIG. 1 (b), the reference pulse and the pulse height data obtained from the reproduced video signal are used in the same manner as in the conventional example to associate the levels at the time of recording and at the time of reproduction. , Correct the level of the playback video signal. However, it is not possible to obtain all the reference pulses and pulse height data corresponding to each level of the video signal when the playback is started or when the variable speed playback is changed to the normal playback. The level at the time of recording corresponding to the reproduced video signal level is calculated by using the signal, and the level is corrected. Hereinafter, this operation will be described in detail.

When updating the level correction information (when starting reproduction or when shifting from variable speed reproduction to normal reproduction)
The level correction information update signal is inputted to the reference signal selection means 11, and the reference signal selection means 11 selects the reference signal from the reproduced video signal. At this time, the reference signal as shown in FIG.
And 255/255 levels are 0/225 + D1 and 255
It becomes / 255 + D2. 0/25 in level correction means 8
5 + D1 and 255/255 + D2 levels other than 5 + D1 and 255/255 + D2 at the time of recording, which are obtained from the reference signal (here, 0/255 + D1 and 255/255).
+ D2) is used for the calculation. Level correction information is created from the level at the time of recording corresponding to the level at the time of reproduction thus obtained, and the level is corrected. For example, a level correction table is created by writing the corresponding recording level in a memory by using the reproduction level as an address, and reading the value from the level correction table using the output data of the reproduction A / D converter 5 as an address. When the operation is performed and the reproduction D / A converter 9 performs D / A conversion, a level-corrected reproduction video signal is obtained. After that, the level correction information is sequentially updated from the reference pulse and pulse height data obtained from the reproduced video signal.

As described above, in this embodiment, the reference pulse corresponding to each level of the recorded video signal, the height data for identifying the reference pulse, and the reference signal such that the minimum and maximum levels of the recorded video signal exist are provided. When creating and inserting and newly creating level correction information, the level correction information is created using the reproduced reference signal, and this level correction information will be referred to as the reference pulse and pulse height data obtained from the reproduced video signal. Since the level correction information is sequentially updated by using, and the level of the reproduced video signal is corrected, it is possible to instantly obtain a good reproduced image even when starting reproduction or shifting from variable speed reproduction to normal reproduction. You can

In the above embodiment, the reference pulse and the pulse height data are inserted in one horizontal period in the vertical blanking period, and the reference signal is inserted in the next one horizontal period. The reference pulse, the pulse height data, and the reference signal may all be inserted in one horizontal period of the vertical blanking period as shown in FIG.

Further, as shown in FIG. 5, the reference signal may be inserted in the horizontal blanking period of all recording video signals. It may also be inserted during the horizontal blanking period of some of the recorded video signals.

As shown in FIG. 6, the reference signal indicating the level of 0/255 is set in the vertical blanking period of one field, and the reference signal indicating the level of 255/255 is set in the vertical blanking period of the other field. May be inserted into. Further, as shown in FIG. 7, the reference signal indicating the level of 0/255 and the reference signal indicating the level of 255/255 may be alternately inserted in the horizontal blanking period.

Thus, the level of 0/255 and 255 /
If the reference signal indicating the level of 255 is inserted into the recorded video signal and recorded, the same effect as the above embodiment can be obtained.

In the above embodiment, 0/255 and 255 /
Although the example using the reference signal indicating the level of 255 has been described, a reference signal having a form indicating the black level and the white level as shown in FIG. 8 may be used. Further, as shown in FIG. 9, a reference signal indicating a black level, a gray level and a white level may be used. Also 0/255 and 128/255
And a reference signal indicating levels of 255/255 may be used.

If the reference signal is configured so that there are at least two levels such as the minimum and maximum levels of the video signal or the black level and the white level in this way, the same effect as in the above-described embodiment can be obtained. Here, the reference signal may be composed of two levels near the minimum and maximum levels of the video signal, or may be composed of two levels near the black level and the white level.

In the above embodiment, the reference signal is composed of at least two levels near the minimum and maximum levels of the video signal or two levels near the black level and the white level,
Although what is inserted into the recorded video signal has been described, instead of newly creating and inserting the reference signal as described above, for example, as shown in FIG. Alternatively, the level correction information may be created by using this signal as a reference signal, recording it by inserting it into a recorded video signal.

Here, the level correction using the reference pulse and the pulse height data obtained from the reproduced video signal is the same as in the conventional example. The level correction information is created from the vertical synchronizing signal in the same manner as the level correction information is created using the reference signal when the level correction information is newly created in the above embodiment. Thereafter, the level correction information is used to correct the level of the reproduced video signal, and the level correction information is sequentially updated using the reference pulse and pulse height data obtained from the reproduced video signal.

As described above, the vertical synchronizing signal is set to 0/2.
Instead of having levels 55 and 255/255, all or part of the horizontal sync signal may have levels 0/255 and 255/255, as shown in FIG. Further, as shown in FIG. 12, a burst signal (a signal used when correcting the time axis during reproduction) indicates two specific levels (L0 and L1) and is used as a reference signal. Good. Furthermore, two or three of the horizontal and vertical sync signals and the burst signal may be used in combination. In addition to the above signals, the same effects as those of the above-described embodiment can be obtained as long as the signals are used during reproduction and can identify at least two levels during recording. A plurality of types of signals that can identify the level at the time of recording may be used in combination.

As described above, one or a plurality of signals whose levels at the time of recording at the time of reproduction can be identified are used as reference signals,
If you use this to create level correction information,
Similar to the case where a reference signal is newly generated and inserted as described above, a good reproduced image can be instantaneously obtained even when reproduction is started or when variable speed reproduction is changed to normal reproduction. Furthermore, by using a signal used for normal recording / reproduction, such as a vertical synchronizing signal, a horizontal synchronizing signal, or a burst signal, as a reference signal, it is not necessary to provide a new area for recording the reference signal, and the recording video signal Can be effectively utilized.

FIG. 13 is a block diagram showing the structure of the reproducing system of the characteristic correcting apparatus showing the second embodiment of the present invention. In this embodiment, a circuit having the same configuration as that of FIG. 42 (a) is used as a circuit for creating the reference data and inserting it into the recorded video signal. In FIG. 13, the same symbols as in FIG. 42 (b) are the same or corresponding parts. Further, this characteristic correction device is a V in which two heads (a head A and a head B) which are opposed to the rotary drum by 180 ° are arranged.
This is a case where the TR is used in a VTR which records a video signal of one field by dividing it into three tracks.

Here, 20 is a correction means switching means for switching the level correction means for each reproducing head by a reproducing head identification signal indicating whether the head A is reproducing or the head B is reproducing, and 22 is the head A. A level correction means A for correcting the level of the reproduced video signal, a level correction means B for correcting the level of the video signal reproduced by the head B,
Reference numeral 21 inputs the reproduced video signal and the reference pulse and pulse height data obtained from the reproduced video signal to the level correction means A22 by the correction means switching means 20 or the level correction means B.
A selector for selecting whether to input to 23, and 24 is a switch for synthesizing the level-corrected video signal reproduced by the head A and the reproduced video signal reproduced by the head B.

Next, the operation will be described with reference to FIGS. 13 to 15. In the recording system of this embodiment, the gate pulse generating means 1 generates the gate pulse GP in the same manner as the conventional example (see FIG. 14 (a)). When the gate pulse GP becomes high, the reference pulse generating means 2 generates the reference pulse RP having 0/255 and a high quantization level. The pulse height data generating means 3 generates the pulse height data HD which is the quantized data in the serial format corresponding to the reference pulse RP having the height of the quantization level of 0/255. Next, when the gate pulse GP becomes high, the reference pulse generating means 2 generates a reference pulse having the same 0/255 quantization level (see FIG. 14 (b)), and the pulse height data generating means 3 generates the reference pulse. Pulse height data corresponding to RP is generated (see FIG. 14 (c)). Thereafter, each time the gate pulse GP is high, the reference pulse generating means 2 increases the quantization level of the reference pulse RP by one quantization level, and generates the reference pulse RP having the same quantization level twice in succession. Then (1/255, 1/255, 2/255, 2/255,
... 254 / 255,254 / 255,255 / 255
255/255), the quantization levels of all recorded video signals are generated. The pulse height data generation means 3 generates the pulse height data HD corresponding to the reference pulse RP which increases by one quantization level at the same quantization level twice each time the gate pulse GP goes high. The pulse height data HD corresponding to the reference pulse RP is used as the reference data RD (see FIG. 14 (d)), and the reference data inserting means 4 inserts the reference data RD in the vertical blanking period.
An output signal such as 5 is obtained. This output signal is recorded through the recording system circuit.

In the recording system of the present embodiment, as described above, the pulse height data HD corresponding to the reference pulse RP having the same quantization level is created twice in succession, inserted into the recorded video signal, and recorded. Since the head A reproduces the pulse height data corresponding to the first reference pulse having the quantization level of 0/255, the next reference pulse having the quantization level of 0/255 is obtained (see FIG. 15). The corresponding pulse height data will be reproduced by the head B. 1/2
The pulse height data corresponding to the reference pulse of the quantization level of 55 is similarly reproduced by the heads A and B, respectively. The reference pulses corresponding to the quantization levels of all video signals and the pulse height data corresponding to the reference pulses are reproduced by the heads A and B, respectively.

From the video signals reproduced by the heads A and B, the reference pulse RP and the pulse height data HD are obtained in the same manner as in the conventional example. When the head A is reproducing, the correction means switching means 20 switches the selector 21 so that the reference pulse RP and the pulse height data H obtained from the reproduced video signal.
D is input to the level correction means A22, and is input to the level correction means B23 when the head B is reproducing. Further, the reproduction video signal of the head A is inputted to the level correction means A22 by the correction means switching means 20 switching the selector 21, and the reproduction video signal of the head B is inputted to the level correction means B23.

Next, in the correcting means A22, all the reference pulses RP reproduced by the head A as in the prior art example.
And a level correction table is created from the pulse height data HD, and the level of the video signal reproduced by the head A is corrected using this level correction table. Further, the level correction means B
Similarly in 23, a level correction table is created from all the reference pulses RP reproduced by the head B and the pulse height data HD, and the level of the video signal reproduced by the head B is corrected.

After that, the video signal reproduced by the head A and the video signal reproduced by the head B, which have undergone the level correction, are combined by the switch 24, and the reproduction D / A / converter 9 performs D / A / D conversion.
When the A conversion is performed, a reproduced video signal whose level is corrected for each head can be obtained.

As described above, in this embodiment, each head stores the reference data corresponding to all the video signals, and at the time of reproduction, the reference data obtained from the video signal reproduced by each head is used for each head. Since the configuration is such that the level correction is performed, it is possible to correct the characteristic difference between the heads and obtain a good reproduced image.

In the embodiment shown in FIG. 14, one reference pulse and the corresponding pulse height data (collectively referred to as reference data) are continuously quantized at the same quantization level twice, and the quantized level is the smallest. Inserted in the vertical blanking period of the recorded video signal, each head records reference data corresponding to the quantization level of all video signals, and at the time of playback, level correction for each head using the reference data played by each head However, other than this, the same quantization level may be repeated twice, and the quantization levels may be inserted in descending order. Alternatively, the same quantization level may be repeated twice, and reference data that changes based on a certain fixed rule may be sequentially inserted. Further, the reference data to be recorded by the head A may be small, and the reference data to be recorded by the head B may be large. Further, the reference data to be recorded by the heads A and B may change according to a certain rule for each of the heads A and B. As described above, if the reference data is inserted within the blanking period so that the heads A and B can record the reference data corresponding to all the video signal quantization levels, it is possible to change the reference data regardless of how the reference data is changed as shown in FIG. The same effect as the embodiment shown in FIG.

Although the reference data has been described as being composed of pulse height data corresponding to one reference pulse, it may be composed of pulse height data corresponding to two reference pulses. Further, it may be composed of pulse height data corresponding to three or more reference pulses.

Further, as shown in the recorded video signal of FIG. 16, only one or a plurality of reference pulses are generated in one horizontal period.
The corresponding pulse height data may be inserted within the next one horizontal period. Further, as shown in the recorded video signal of FIG. 17, the pulse height data may be inserted first, followed by one or more reference data. Any pattern may be used as long as the pulse height data corresponding to one or a plurality of reference pulses is inserted in the blanking period, and the same effect as the embodiment shown in FIG. 14 is obtained. Play.

Further, in the embodiment shown in FIG. 13, as the level correction method, the pulse height data corresponding to the A / D data of the reproduction reference pulse is written in the memory to create the correction table for each head. In an ordinary video period, an example is used in which the output data of the reproduction A / D converter 8 is allocated by the reproducing head and the corrected value is read from the memory as the address of the correction table of each head. As described above, as the level correction method, for example, as the level correction method, the difference between the reproduction reference pulse data and the pulse height data is written in the memory as the correction data, and the output data of the reproduction A / D converter 8 in the normal video period. The correction data is read from the memory by using as an address and added to the output data of the reproduction A / D converter 8 to correct the level. To. Further, another level correction method such as creating level correction data by software using a microcomputer and interpolating the data when a discontinuity occurs in the level correction data may be used.

In the embodiment shown in FIG. 13, the reproducing head is identified and the reproduced video signal, the reference pulse and the pulse height data are distributed to the level correcting means A22 and B23 of each head. As described above, the switching of the heads may be identified and the reproduced video signal, the reference pulse, and the pulse height data may be distributed to the level correction means of each head. Further, as shown in FIG. 18, the correction means switching means 20 identifies the reproducing head, and when the head A reproduces, the writing to the level correcting means B23 is prohibited, and the head B reproduces. At this time, the writing to the level correcting means A22 may be prohibited, and the same effect as the embodiment of FIG. 13 is obtained.

In the above embodiment, an example using binary pulse height data of high or low has been described, but quantized data such as ternary data may be used. Further, in the above-mentioned embodiment, the example in which the reproduction reference data obtained at the time of reproduction is used as it is has been described. Further effects can be expected by using a means such as not using the data of 1.

In the above embodiment, the rotary drum has 180
A VTR that arranges two heads facing each other and records a video signal of one field by dividing it into three tracks.
The case of applying to a VTR
In addition to the above case, n sets (n = 1, 2, 3 ...) Of two heads opposed to the rotary drum by 180 ° are arranged, and one field or one frame of video signal is n × m (m is an odd number).
In the VTR so as to divide the recording into the tracks, the 2n heads respectively record the reference data corresponding to the quantization levels of all the video signals in the characteristic correcting device, and the level correcting means corresponding to the 2n heads are provided. If the correction means switching means is provided so as to distribute the reference data reproduced by each head to the level correction means corresponding to each head, the same effect as the embodiment shown in FIG. 13 can be obtained.

FIG. 19 is a block diagram showing the structure of the reproducing system of the characteristic correcting apparatus according to the third embodiment of the present invention. In this embodiment, a circuit having the same configuration as that of FIG. 42 (a) is used as a circuit for creating the reference data and inserting it into the recorded video signal. 19, the same reference numerals as those in FIG. 42 denote the same or corresponding parts.
Here, reference numeral 30 is used to create level correction information corresponding to normal reproduction using reference data obtained from the reproduction video signal during normal reproduction, and the level correction information is used to correct the level of the reproduction video signal during normal reproduction. Sometimes, the level correction information at the time of FS is created by using the reference data in the same manner as at the time of the normal reproduction, and the level of the reproduced video signal at the time of FS is corrected and R
Similarly, at S time, level correction information at RS time is created,
The level correction means for correcting the level of the reproduced video signal at the time of RS, 31 selects which level correction information is to be created according to the normal reproduction, the FS time or the RS time, and corrects the level of the reproduced video signal. It is a level correction information creation control means for selecting which level correction information to use.

FIG. 20 shows the level correction means 3 in FIG.
It is a block diagram which shows the detailed structure of 0. In the figure,
Reference numeral 32 is a normal reproduction level correction means for correcting the level of the reproduced video signal using only reference data obtained from the normal reproduction video signal, and 33 is a reproduced video using only the reference data obtained from the FS video signal. FS correcting means for level correcting the signal, 34 is an RS time level correcting means for level correcting the reproduced video signal using only reference data obtained from the RS video signal, and 35 is a reference obtained from the reproduced video signal. A selector for allocating the data to either the normal reproduction level correction means 32, the FS time level correction means 33 or the RS time level correction means 34 according to the reproduction speed, and 36 selects which level correction means output according to the reproduction speed. It is a switch that decides whether to do it.

Next, the operation will be described. Reference data is created using the circuit of FIG. 32 (a) in the same manner as the conventional example, and is inserted into the recorded video signal. When the reproduction speed identification signal indicates the reproduction at the normal speed, the level correction information creation control means 31 operates the selector 35 to input the reference data obtained from the reproduced video signal only to the normal reproduction level correction means 33. To do so. The normal reproduction level correction means 32 uses the obtained reference data to create level correction information corresponding to normal reproduction, and uses the level correction information to correct the level of the reproduced video signal. Since no reference data is input to the correction means 33 at the FS time and the level correction means at the RS time, the level correction information corresponding to the FS time and the RS time is not changed. Level correction information creation control means 31
Controls the switch 36 so that the level-corrected reproduced video signal is selected using the corresponding level correction information during normal reproduction, and is output to the reproduction D / A converter 9. The reproduction D / A converter 9 performs D / A conversion to obtain a level-corrected reproduction video signal. The method of correcting the level of the reproduced video signal is the same as in the conventional example.

Next, when the normal reproduction is shifted to the FS, the level correction information creation control means 31 operates the selector 35 to input the reference data to the normal reproduction level correction means 32. Change to be input to 33. Hereinafter, the level of the reproduced video signal is corrected in the same manner as in the normal reproduction. The switch 36 outputs the reproduced video signal whose level has been corrected by the FS level correcting means 33 so as to output the level correction information creation control means 31.
Controlled by. Here, the correction information corresponding to the normal reproduction does not change because the reference data is not input, and the level correction information corresponding to the normal reproduction immediately before the FS is held. Further, the level correction information corresponding to the RS time is also held in the same manner.

Further, when the mode is shifted from FS to normal reproduction, the level correction information creation control means 31 operates the selector 3 in the same manner as described above.
5 is switched so that the reference data is input to the level correction means 32 during normal reproduction. At this time, since the level correction information corresponding to the normal reproduction immediately before the FS is held, it is updated based on this level correction information using the reference data. In addition, even when shifting to RS, only the level correction information corresponding to RS is updated in the same manner.

As described above, in this embodiment, the normal reproduction level correction means 32, the FS level reproduction means 33 and the RS time level correction means 34 are provided, and the selector 35 is switched according to the reproduction speed to determine which level correction means. Select whether or not to input the reference data to, the level correction information is updated only in the level correction means to which the reference data is input, the reproduced video signal is level-corrected based on the level correction information, and the other level correction information is Since it is configured to be held, a good level-corrected reproduced image can be instantly obtained even if the reproducing speed changes.

In the above embodiment, normal reproduction, FS and RS
Although the level correction means corresponding to the above is provided and the reference data is distributed to each level correction means according to the reproduction speed, the level correction means 30 in FIG. 19 is shown.
May be configured as shown in FIG. Here, 37 is level correction means for creating level correction information using reference data obtained from the reproduced video signal, and level correction is performed for the reproduced video signal using the level correction information, and 38 is normally created by the level correction means 37. The level correction information storage means stores level correction information corresponding to reproduction, FS, and RS.

Next, the operation will be described. When the reproduction speed identification signal indicates normal reproduction, the level correction means 37
Uses the reference data obtained from the reproduced video signal to create level correction information corresponding to normal reproduction, and uses the level correction information to correct the level of the reproduced video signal. When shifting from normal reproduction to FS, the level correction information creation control means 31 saves and stores the level correction information in the current level correction means 37 (level correction information corresponding to normal reproduction) in the level correction information storage means 38. The level correction information storage means 38 is returned to the level correction information level correction means 37 corresponding to the FS. Thereafter, the level correction means 37 can obtain this level correction information. The level of the reproduced video signal is corrected on the basis of this level correction information by updating with the reference data. The level correction information in the current level correction means 37 is saved and stored in the level correction information storage means 38 at every transition between normal reproduction, FS reproduction, and RS reproduction, and the level corresponding to the current reproduction speed is stored. The correction information is returned to the level correction means 37.

As described above, each time the reproduction speed changes, the level correction information in the level correction means 37 is saved, the level correction information corresponding to the current reproduction speed is returned to the level correction means 37, and the reproduced video signal has its level. Since the level is corrected based on the correction information, the same effect as that of the level correcting means 30 shown in FIG. 20 is obtained.

Further, the level correction means 30 in FIG. 19 can also be constructed as shown in FIG. In FIG. 22,
Reference numeral 39 is a level correction means at the time of variable speed reproduction for correcting the level of the reproduced video signal using only the reference data obtained from the video signal at the time of variable speed reproduction. The normal reproduction level correction means 32 distributes the selector to the variable speed reproduction level correction means 39. Reference numeral 41 indicates either the normal reproduction level correction means 32 or the variable reproduction time level correction means 39 according to the normal reproduction or the variable speed reproduction. Switch to decide which to select,
Reference numeral 42 is a level correction information storage means for storing the level correction information corresponding to the FS time and the RS time created by the variable speed reproduction level correction means 39. The normal reproduction level correction means 32 is the same as that shown in FIG.

Next, the operation will be described. When the reproduction speed identification signal indicates reproduction at the normal speed, the level correction information creation control means 31 operates the selector 40 to input the reference data obtained from the reproduced video signal only to the normal reproduction level correction means 32. To do so. The normal reproduction level correction means 32 uses the obtained reference data to create level correction information corresponding to normal reproduction, and uses the level correction information to correct the level of the reproduced video signal. The level correction information creation control means 31 controls the switch 41 so as to select the output of the level correction means 32 during normal reproduction.

When the normal reproduction is shifted to the FS, the level correction information creation control means 31 operates the selector 40 to input the reference data to the normal reproduction level correction means 32 so that the variable reproduction level correction means 39 is operated. Input to the storage means 42, and the level correction information currently stored in the level correction means 39 during variable speed reproduction is saved in the level correction information and storage means 42.
The level correction information at the time of variable speed reproduction is stored and the level correction information corresponding to the FS at the time of FS is stored from the level correction information storage means 42.
Return to. After that, the level correction means 39 at the time of variable speed reproduction updates this level correction information with the reference data that can be obtained,
The level of the reproduced video signal is corrected based on this level correction information. Hereinafter, the level correction information currently stored in the level correction means 39 during variable speed reproduction is saved and stored in the level correction information storage means 42 each time the normal reproduction is changed to the FS reproduction or the RS reproduction or between the FS reproduction and the RS reproduction. Then, the level correction information corresponding to the current reproduction speed is returned to the level correction means 39 during variable speed reproduction.

As described above, in the embodiment shown in FIG. 22, the reference data is input only for the normal reproduction level correction means 32 during the normal reproduction, the level correction information is updated, and only the variable reproduction level correction means 39 is used as the reference during the variable speed reproduction. Data is input, the level correction information in the variable speed reproduction level correction means 39 is saved and stored according to FS or RS, and the level correction information corresponding to the current reproduction speed is returned to the variable speed reproduction level correction means 39. In this way, the reproduced video signal is level-corrected by the normal reproduction level means 32 during normal reproduction and by the variable reproduction level correction means 39 during variable speed reproduction. Therefore, the level correction means 3 shown in FIGS.
The same effect as 0 is achieved.

In the above embodiment, the level correction information corresponding to the normal reproduction and the three areas of FS and RS are created according to the reproduction speed, and the level correction information corresponding to the normal reproduction is created by the reference data obtained during the normal reproduction. The information is updated, similarly, the level correction information corresponding to the FS is updated with the reference data during the FS, and the level correction information corresponding to the RS is updated with the reference data during the RS. Based on each level correction information, Although the video signal having the corresponding reproduction speed is level-corrected, the FS and the RS are divided into two or more areas depending on the difference in the reproduction speed, and the level correction means corresponding to each area is provided similarly to the configuration of FIG. May be provided to create level correction information corresponding to each area, and thereby the level of the reproduced video signal may be corrected. Also,
In this way, FS and RS are each divided into two or more areas depending on the difference in reproduction speed, and level correction information corresponding to each area is saved and stored and restored similarly to the reproduction speed as in FIGS. It may be configured as follows.

In the above embodiment, as the level correction method, the reproduction reference pulse digital data is used as the write address, the corresponding pulse height data is written in the memory, and the output data of the reproduction A / D converter 5 is used as the read address. As an example, the method of reading out the value to be corrected by the memory has been described. However, for example, the difference between the reproduction reference pulse data and the pulse height data is written in the memory as the correction data, and the output of the reproduction A / D converter 5 is output. The correction data is read from the memory by using the data as an address, and is added to the output data of the reproduction A / D converter 5 to perform the level correction, or the level correction data is created by software using a microtamper, Use another level correction method such as interpolating data when discontinuity occurs in the correction data. It may be.

Further, in the above-mentioned embodiment, an example in which the data of the reproduction reference pulse obtained at the time of reproduction is used as it is has been described. Further effects can be expected by using a means such as not using the reproduction reference pulse data.

FIG. 23 is a block diagram showing the structure of the reproducing system of the characteristic correcting apparatus according to the fourth embodiment of the present invention. In this embodiment, a circuit having the same configuration as that of FIG. 42 (a) is used as a circuit for creating the reference data and inserting it into the recorded video signal. In FIG. 23, the same symbols as those in FIG. 42 (b) are the same or corresponding portions. A reference numeral 50 is used to create level correction information using reference data obtained from the reproduced video signal during normal reproduction, level-corrects the reproduced video signal based on the level correction information, and performs level correction corresponding to normal reproduction during variable speed reproduction. This is a level correction means for creating level correction information from the information and the reproduction speed, correcting the level of the reproduced video signal based on the level correction information, and holding the level correction information corresponding to the normal reproduction during the variable speed reproduction.

FIG. 24 is a block diagram showing the structure of the level correcting means 50 shown in FIG. In the figure, 51
Is a level correction means during normal reproduction that creates level correction information using reference data obtained from the reproduced video signal and corrects the level of the reproduced video signal based on the level correction information.
Reference numeral 52 is a variable speed reproduction for calculating the level correction information corresponding to the reproduction speed from the level correction information created by the normal reproduction level correction means 51 and the reproduction speed, and correcting the level of the reproduced video signal based on the level correction information. The hour level correcting means 53 is a switch for prohibiting reference data from being input to the normal reproducing level correcting means 51 during variable speed reproduction. Further, 54 is a switch for selecting the output of the normal reproduction level correction means 51 during normal reproduction, and the output of the variable reproduction level correction means 52 during variable speed reproduction, and 55 is for creating level correction information and level correction of the reproduced video signal. It is a level correction information creation control means for controlling.

Next, the operation will be described. In the recording system, the gate pulse generating means 1, the reference pulse generating means 2, the pulse height data generating means 3, and the reference data inserting means 4 are used to identify the reference pulse and the reference pulse in the same manner as in the conventional example. Reference data consisting of height data is inserted into the recorded video signal.

On the other hand, in the reproduction system, when the reproduction speed identification signal indicates normal reproduction, the level correction information creation control means 55 operates the switch 53 to input the reference data to the normal reproduction level correction means 51. To do so. The normal reproduction level correction means 51 creates level correction information corresponding to the normal reproduction using the obtained reference data, and corrects the level of the reproduced video signal based on the level correction information.
The level correction information creation control means 55 operates the selector 54 to reproduce the reproduced video signal which has undergone the level correction and reproduces the D / D signal.
Output to the A converter 9. The method of correcting the level of the reproduced video signal is the same as in the conventional example.

When the reproduction speed identification signal is not normal reproduction,
That is, when the variable reproduction is indicated, the level correction information creation control means 55 operates the switch 53 so that the reference data is not input to the level correction means 51 during normal reproduction,
The level correction information of the normal reproduction immediately before the variable speed reproduction is transferred to the level correction means 52 during the variable speed reproduction. The variable-speed reproduction level correction means 52 calculates and obtains level correction information corresponding to the reproduction speed from the level correction information and the reproduction speed. For example, it is obtained from an expression such as (level correction information during variable speed reproduction) = (level correction information during normal reproduction immediately before variable speed reproduction) × A + B. It should be noted that A and B are values determined by the variable reproduction speed. The level correction information creation control means 55 switches the selector 54 so that the reproduction video signal whose level is corrected based on the obtained level correction information is output to the reproduction D / A converter 9.

As described above, in the present embodiment, the level of the reproduced video signal is corrected using the reference data obtained from the reproduced video signal during the normal reproduction, and the level is corrected using the level correction information and the reproduction speed during the normal reproduction during the variable speed reproduction. Since the correction is performed, level correction can be performed during normal reproduction and variable speed reproduction, and since level correction means is provided separately for normal reproduction and variable speed reproduction, the level correction information during normal reproduction is changed. It is held during reproduction, and good level correction can be instantaneously performed even if the normal reproduction is changed to the variable speed reproduction or the variable speed reproduction is changed to the normal reproduction.

In the above embodiment, an example in which the switch 53 is provided so that the reference data during the variable speed reproduction is not inputted to the level correction means 51 during the normal reproduction is shown.
As described above, the level correction information creation control means 55 may be controlled so as not to update the level correction means 51 during normal reproduction during variable speed reproduction, and the same effect as the above-described embodiment is obtained.

Further, in the above-mentioned embodiment, an example in which different level correction means are provided for the normal reproduction and the variable speed reproduction has been described, but it may be configured as shown in FIG. In FIG. 26, reference numeral 56 is a level correction means for correcting the level of the reproduced video signal based on the level correction information corresponding to the normal reproduction or variable speed reproduction, and 57 is a level correction information storage means for storing the level correction information corresponding to the normal reproduction. Reference numerals 58 denote level correction information generation means for variable speed reproduction for generating level correction information according to the reproduction speed during variable speed reproduction.

Next, the operation will be described. When the reproduction speed identification signal indicates normal reproduction, the level correction information creation control means 55 creates level correction information using the reference data obtained from the reproduced video signal by the level correction means 56, and based on the level correction information. Control is performed so that the reproduced video signal is level-corrected. When the normal reproduction is changed to the variable speed reproduction, the level correction information creation control means 55 saves and stores the level correction information corresponding to the normal reproduction immediately before the variable speed reproduction in the level correction information storage means 57 and the level correction information corresponding to the normal reproduction. Using the reproduction speed, the level correction information creation means 58 for variable speed reproduction creates level correction information corresponding to the reproduction speed and transfers it to the level correction means 56. When shifting from variable speed reproduction to normal reproduction, the level correction information creation control means 55 restores the level correction information in the level correction information storage means 55 to the level correction means 56.
When the reproduction speed changes during the variable speed reproduction period, level correction information corresponding to the normal reproduction immediately before variable speed reproduction and the changed reproduction speed are used to newly generate level correction information corresponding to the reproduction speed. It is created by the means 58 and transferred to the level correction means 56 by the level correction information creation control means 55.

As described above, the level correction is performed according to the reference data obtained during the normal reproduction, and the level correction information is saved and stored when the variable speed reproduction is performed. 25 and 26, the level correction information for normal reproduction is restored when shifting from variable speed reproduction to normal reproduction. It has the same effect as the example.

In the embodiments of FIGS. 25 and 26, the level correction information is sequentially updated using the reference data obtained during the variable speed reproduction period, and the reproduced video signal is level-corrected based on the level correction information. If so, a further effect can be expected.

Further, in the above-described embodiment, as the level correction method during normal reproduction, the digital data of the reproduction reference pulse is used as the write address, the corresponding pulse height data is written in the memory, and the output of the reproduction A / D converter 5 is output. An example using the method of reading the value to be corrected by the memory using the data as the read address has been described. The correction data is read from the memory by using the output data of the device 5 as an address, and the level correction data is added to the output data of the reproduction A / D converter 5 to correct the level. Create other level correction data such as interpolating data when discontinuity occurs in the level correction data. Method may be used.

In the above embodiment, the data of the reproduction reference pulse obtained at the time of reproduction is used as it is.
Further smoothing effect can be expected by using a means such as not using the reproduction reference pulse data when dropout occurs.

FIG. 27 is a diagram for explaining the operation of the characteristic correction device according to the fifth embodiment of the present invention. The recording system and the reproducing system of the characteristic correcting apparatus according to the present embodiment have the same configuration as the conventional example shown in FIG.

Next, the operation will be described. The gate pulse generating means 1 is a gate pulse GP in the same manner as the conventional example.
Is generated (see FIG. 27 (a)). Reference pulse generating means 2
Generates a reference pulse having a quantization level height of 0/255 and a reference pulse having a quantization level height of 255/255 successively when the gate pulse GP becomes high, and these two reference pulses are used as a set. The reference pulse RP is used.
The pulse height data generating means 3 are 0/255 and 255/2.
The pulse height data HD which is the quantized data in the serial format corresponding to the reference pulse RP which is the set of reference pulses having the height of the quantization level of 55 is generated. Here, the pulse height data HD is composed of 7 bits.

Thereafter, each time the gate pulse GP becomes high, the reference pulse generating means 2 increases the reference level (1/25 by 1 quantization level from the quantization level of 0/255).
5, 2/255, ... 127/255) and 255/255
Of the reference pulse (254/255, 253/255 ... 128/2
55) is continuously generated. The pulse height data generating means 3 is a reference pulse RP (1/255 and 254/25) which is a set of two reference pulses generated by the reference pulse generating means 2.
5, 2/255 and 253/255, 127/255 and 128/255) are generated. Two reference pulses RP and pulse height data HD
The reference data RD is used as reference data, and the reference data insertion means 4 inserts the reference data RD in the vertical blanking period to obtain an output signal as shown in FIG. This output signal is recorded through the recording system circuit.

When the reference pulse is generated in this way,
The average value of the reference data RD is, for example, two reference pulses R
When the quantization level of P is 0/255 and 255/255, it is (0/255 + 255/255) / 2, and the average value of all the reference data RD is 127.5 / 255, which is almost the gray level of the video signal. Is equal to That is, the value of the reproduction reference pulse does not depend on the quantization level at the time of recording and becomes almost equal to the characteristic of the video signal, and the output of reproducing such reference data RD is affected by the sag as shown in FIG. Has been reduced. At the time of reproduction, level correction is performed using the reference pulse and pulse height data obtained from the reproduced video signal in the same manner as in the conventional example.

In the embodiment shown in FIG. 27, one reference pulse of the two reference pulses is increased by one quantization level from the quantization level of 0/255, and the other reference pulse is increased by 255 /. The case has been described in which the quantization level is decreased from the quantization level of 255 by 1 quantization level and the reference data is combined with the pulse height data corresponding to the two reference pulses, and the reference data is inserted in the blanking period of the recorded video signal. Alternatively, one reference pulse may be decreased by 1 quantization level from the quantization level of 127/255, and the other reference pulse may be increased by 1 quantization level from the quantization level of 128/255. In addition, a combination of two reference pulses (0/255 and 255/255,
1/255 and 254/255, ..., 127/255 and 1
28/255), and the two reference pulses may be changed in a certain order.

From the quantization level of 0/255, 255
Instead of the reference pulse corresponding to the quantization level of / 255, the corresponding reference pulse from the black level to the white level of the video signal is generated, and the reference pulse is adjusted so that the average value of the two reference pulses becomes the gray level. It is also possible to form groups and use the pulse height data corresponding to each group as the reference data. Again 2
The average value of the individual reference pulses is not limited to 127.5 / 255 or the gray level, but may be approximately equal to the gray level of the video signal or 128/255. Thus, if the average value of the reference pulse is almost equal to the gray level of the video signal or 128/255 and the reference pulse corresponding to all the quantization levels of the video signal is generated, the embodiment shown in FIG. It has the same effect as the example.

The number of reference pulses forming the reference data is not limited to two, and the reference data is formed by pulse height data corresponding to three or more reference pulses, and the average value of the reference pulses is The gray level of the video signal may be approximately equal to the gray level of the video signal.

As shown in the recorded video signal of FIG. 29,
Only a plurality of reference pulses may be inserted in one horizontal period, and pulse height data may be inserted in the next one horizontal period. Alternatively, as shown in the recorded video signal of FIG. 30, a plurality of reference pulses may be inserted after the pulse height data. In this way, by inserting pulse height data corresponding to a plurality of reference pulses into the blanking period and selecting so that the average value of the plurality of reference pulses is approximately the gray level of the video signal, a pattern such as May be obtained, and the same effect as that of the above-described embodiment can be obtained.

In the embodiment shown in FIG. 27, an example using binary pulse height data of high or low has been described, but quantized data such as ternary data may be used. Further, in the embodiment shown in FIG. 27, the example in which the pulse height data composed of the 7-bit quantized data in the binary serial format is used has been described, but this can be further configured as follows. The effect of can be expected. That is, in the case of binary serial format, the pulse height data is 1
Of these 10-bit quantized data, pulse height data corresponding to two reference pulses is selected from a combination in which H level is 5 bits and L level is 5 bits.

When all pulse height data is generated in this way, the number of bits of H level and L level of the pulse height data becomes 5, respectively, so that the quantum of H level and L level of the pulse height data is generated. If the average of the quantization levels is selected to be the gray level of the video signal, the average quantization level of the pulse height data will be equal to the gray level of the video signal. Therefore, the average value of the entire reference data becomes substantially equal to the gray level of the video signal, and the influence of sag can be further reduced. Also, when the pulse height data is in a serial format of three or more values, similar to the case of two values, if the pulse height data is selected so that the average value of the pulse height data becomes a gray level, the same effect can be obtained. can get.

FIG. 32 is a block diagram showing the structure of a characteristic correction device according to the sixth embodiment of the present invention. In this example,
Correction signal (here, reference pulse and pulse height data)
The same circuit as that shown in FIG. 42 (a) is used as a circuit for creating and inserting it in the recorded video signal. In FIG. 32, the same reference numerals as those in FIG. 42 indicate the same or corresponding parts, and 60 indicates a normal reproduction by a reproduction speed identification signal (a signal indicating the current reproduction speed) output from a microcomputer or the like (not shown). At the time, it is permitted to update the level correction information stored in the level correction table of the level correction means using the correction signal obtained from the reproduced video signal, and at the time of variable speed reproduction, the update of the level correction information is prohibited. It is an update prohibition means.

Next, the operation will be described. In the recording system, the gate pulse generating means 1, the reference pulse generating means 2, the pulse height data generating means 3, and the reference data inserting means 4 are used to identify the reference pulse and the reference pulse in the same manner as in the conventional example. Reference data consisting of height data is inserted into the recorded video signal.

When the reproduction speed identification signal indicates reproduction at the normal speed, the update prohibiting means 60 permits updating the level correction information using the correction signal obtained from the reproduced video signal. The level correction means 8 performs level correction using the level correction information. The method of correcting the level of the reproduced video signal is the same as in the conventional example.

When the reproduction speed identification signal is not in the normal speed reproduction state, that is, when the reproduction is variable speed reproduction, the update prohibiting means 60 uses the correction signal obtained from the reproduced video signal to detect the level correction information. Prohibit update. At this time, the level correction means 8 holds the level correction information of the normal reproduction immediately before the variable speed reproduction. Therefore, the level correction means 8 performs level correction based on this level correction information.

In this way, during normal reproduction, level correction is performed based on the correction signal obtained from the reproduced video signal, during variable speed reproduction, updating of the level correction information is prohibited, and normal reproduction immediately before variable speed reproduction is performed. Since the level correction operation is performed on the basis of the level correction information of 1, the image quality is not deteriorated due to the level correction during the variable speed reproduction, and a good reproduced image can be obtained even in the period immediately after the transition from the variable speed reproduction to the normal reproduction.

In the above embodiment, an example in which the update prohibiting means 60 controls whether to permit or prohibit the update of the level correction information by using the correction signal obtained from the reproduced video signal in accordance with the reproduction speed is shown. However, as shown in FIG. 33, a switch may be used together to control whether updating is permitted or prohibited. Here, reference numeral 61 is a switch for selecting either a level-corrected reproduced video signal or a level-uncorrected reproduced video signal.

Next, the operation of FIG. 33 will be described. The update prohibiting means 60 controls whether to permit or prohibit the update of the level correction information according to the reproduction speed, as in the first embodiment. Further, the update prohibiting means 60 controls the switch 61 so that the level-corrected reproduced video signal can be selected during normal reproduction and the level-corrected reproduced video signal can be selected during variable speed reproduction. Even with this structure, the same effect as that of the embodiment shown in FIG. 32 can be obtained.

In the above embodiment, the correction signal is composed of the reference pulse and the pulse height data. However, when the ramp signal is used as the correction signal as in the conventional example shown in FIG. The present invention can also be applied. In this case, the structure shown in FIG. 34 may be used, and the same effects as those of the embodiments of FIGS. 32 and 33 can be obtained. In the embodiment shown in FIG. 34, reference numeral 62 is an input terminal for a reproduction speed identification signal.

In the embodiment of FIG. 34, the level correction is performed using the reproduction ramp signal during normal reproduction, and the update of the contents of the level correction table memory 65 using the reproduction ramp signal is prohibited during variable speed reproduction.

Further, as still another embodiment, it may be constructed as shown in FIG. In the embodiment shown in FIG. 35, the updating prohibiting means 60 prohibits updating of the contents of the level correction table memory 65 during variable speed reproduction, as in the embodiment of FIG. Further, the update prohibiting means 60 controls the switch 61 so as to select the reproduced video signal which has undergone the level correction during the normal reproduction and the reproduced video signal which has not undergone the level correction during the variable speed reproduction.

Further, in the embodiments of FIGS. 32 and 33, the example in which the data of the reproduction reference pulse obtained at the time of reproduction is used as it is has been described. By using
Further correction effect can be expected.

Further, a further correction effect can be expected by using the means of not using the reproduction correction signal when dropout occurs in the embodiment of FIGS. 32 to 35.

FIG. 36 is a block diagram showing the structure of a characteristic correction device according to the seventh embodiment of the present invention. Here, the circuit for creating the reference data and inserting it into the recorded video signal is shown in FIG.
Same as (a). 36, the same reference numerals as those in FIG. 42 denote the same or corresponding parts. Here, reference numeral 80 denotes level correction information for normal reproduction created by using reference data obtained from the reproduced video signal during normal reproduction, level-corrects the reproduced video signal based on the level correction information, and previously obtained during variable speed reproduction. The level correction means performs level correction based on the level correction information corresponding to the current reproduction speed, and holds the level correction information during normal reproduction during the variable speed reproduction period.

FIG. 37 is a block diagram showing the detailed structure of the level correcting means 80 in FIG. Where 8
Reference numeral 1 is a normal reproduction level correction means for creating level correction information using reference data obtained from the reproduction video signal and correcting the level of the reproduction video signal based on the level correction information. Reference numeral 82 is a specific level during FS. FS level correction means for obtaining level correction information corresponding to the reproduction speed in advance and level correcting the reproduced video signal based on the level correction information, and 83 is level correction information corresponding to a certain reproduction speed at RS time. Is obtained in advance, and RS level correction means for level-correcting the reproduced video signal based on the level correction information, and 84 is prohibited from inputting reference data to the normal reproduction level correction means 81 during the variable speed reproduction period. A switch, 85 is a level correction means 8 during normal reproduction during normal reproduction.
1, a selector for selecting the output of the FS level correction means 82 during FS and the output of the RS time level correction means 83 during RS, and 86 is a level for controlling the creation of level correction information and the level correction of the reproduced video signal. It is a correction information creation control means.

Next, the operation will be described. In the same manner as the conventional example, reference data is created using the circuit of FIG. 42 (a) and inserted into the recorded video signal. When the reproduction speed identification signal indicates normal reproduction, the level correction information creation control means 86 operates the switch 84 to input the reference data to the normal reproduction level correction means 81. The normal reproduction level correction means 81 uses the obtained reference data to create level correction information corresponding to normal reproduction, and corrects the level of the reproduced video signal based on the level correction information. The level correction information creation control means 86 is operated by the selector 85 so as to output the reproduced video signal subjected to the level correction.
Is operated to output to the reproduction D / A converter 9. In addition,
The method of correcting the level of the reproduced video signal is the same as that of the conventional example.

After shifting from the normal reproduction to the FS, the level correction information creation control means 86 operates the switch 84 so that the reference data is not input to the level correction means 81 during the normal reproduction. The level correction information at the time of FS is shown in FIG.
8, the reproduced video signal is level-corrected based on the level correction information. For example, in the FS level correction means 82, a level correction table in which the relationship of data to addresses is as shown in FIG. When the data is read and D / A converted by the reproduction D / A converter 7, a level-corrected reproduction video signal is obtained. A is a value determined by the reproduction speed. The level correction information creation control means 16 switches the selector 85 so that the reproduced video signal subjected to the level correction is output to the reproduction D / A converter 9.

Further, even when shifting from normal reproduction to RS, level correction information for RS as shown in FIG. 38 is created in advance in the same manner as when shifting to FS, and based on the level correction information. Corrects the level of the playback video signal. B is a value determined by the reproduction speed. Further, even when the FS is changed to the RS or the RS is changed to the FS, the reproduced video signal level-corrected by the FS time level correction means 82 during the FS and the reproduced video signal level-corrected by the RS time level correction means 83 during the RS time. The level correction information creation control means 86 switches the selector 85 so as to select.

In this manner, during normal reproduction, the reproduced video signal is level-corrected using the reference data obtained from the reproduced video signal, and level correction information at the time of FS and RS is obtained in advance. With level correction information,
At the time of RS, the reproduction video signal is level-corrected by the level correction information at the time of RS, so that even during normal reproduction,
Level correction can be performed even during variable speed reproduction, and level correction means is provided so as to correspond to normal reproduction, FS time, and RS time respectively, so that the level correction means during normal reproduction is not updated during the variable speed reproduction period. As configured, normal playback and FS
Good level correction can be performed instantly even if the transition is made between RS and RS.

In the embodiment shown in FIG. 37, during variable speed reproduction,
The example in which the switch 84 is provided so that the reference data is not input to the level correction means 81 during the normal reproduction is shown.
As shown in FIG. 39, even when the normal reproduction level correction means 81 is configured so that the level correction information at the normal reproduction is not updated during the variable speed reproduction, the same effect as that of the embodiment of FIG. 37 is obtained. Further, in the embodiments of FIGS. 37 and 39 described above, an example in which different level correcting means is provided for normal reproduction, FS, and RS has been described, but it may be configured as shown in FIG. Here, 87 is a level correction means for level correcting the reproduced video signal based on the level correction information at the time of normal reproduction or variable speed reproduction, 88 is a level correction information storage means for storing level correction information at the time of normal reproduction, and 89 is FS and RS
Is a level correction information storage unit for variable speed reproduction, which stores the level correction information. The same reference numerals as those in FIG. 37 denote the same or corresponding parts.

Next, the operation will be described. When the reproduction speed identification signal indicates normal reproduction, the level correction information creation control means 86 operates the switch 84 to input the reference data obtained from the reproduced video signal to the level correction means 87. The level correction means 87 creates level correction information using the reference data, and corrects the level of the reproduced video signal based on the level correction information. When the normal reproduction is shifted to the FS, the level correction information creation control means 86 stores the level correction information of the normal reproduction immediately before the FS in the level correction information storage means 88.
The FS level correction information is transferred from the level correction information storage means 89 for variable speed reproduction to the level correction means 87. The level correcting means 87 corrects the level of the reproduced video signal based on the level correction information of the FS. Also, when the normal reproduction is switched to the RS, the level correction information of the normal reproduction immediately before the RS is similarly saved and stored,
The level correction information of RS is transferred, and the level of the reproduced video signal is corrected based on the level correction information. Note that FIG.
It is assumed that the FS and RS level correction information as shown in FIG. The level correction information shown in FIG. 38 is also used in the following cases.

When the mode is shifted from FS or RS to normal reproduction, the level correction information creation control means 86 restores the level correction information at the normal reproduction in the level correction information storage means 88 to the level correction means 87 and operates the switch 84. Then, the reference data is input to the level correction means 87. The level correction means 87 sequentially updates the level correction information based on the restored level correction information with reference data, and corrects the level of the reproduced video signal based on the level correction information.

As described above, the level correction is performed by the reference data obtained during the normal reproduction, the level correction information is saved and stored in the variable speed reproduction, the level correction is performed based on the level correction information of FS or RS, and the normal reproduction is performed. Since the level correction information at the time of normal reproduction is restored, the same effect as the embodiment of FIG. 37 can be obtained.

In the embodiment shown in FIG. 40, during variable speed reproduction,
An example in which the switch 84 is provided so that the reference data is not input to the level correction means 87 has been shown.
The level correction means 87 may be configured not to update the level correction information during the variable speed reproduction during the variable speed reproduction, as in the embodiment of FIG.

Other than the embodiments shown in FIGS. 37, 39, and 40, the structure shown in FIG. 41 may be adopted. Where 90
Is a level correction means during variable speed reproduction for level-correcting the reproduced video signal based on the level correction information during variable speed reproduction. The same reference numerals as those in FIGS. 37 and 40 denote the same or corresponding parts.

Next, the operation will be described. At the time of normal reproduction, the level correction means 81 during normal reproduction corrects the level of the reproduced video signal using the obtained reference data as in the embodiment shown in FIG.

When shifting to FS, the level correction information creation control means 86 operates the switch 84 so that the reference data is not input to the level correction means 81 during normal reproduction, and the level correction information storage means 89 for variable speed reproduction stores the FS. The level correction information is transferred to the level correction means 90 during variable speed reproduction.
The variable reproduction level correction means 90 corrects the level of the reproduced video signal based on the level correction information of the FS. Also,
Similarly, when the shift to the RS is performed, the variable speed reproduction level correction means 90 corrects the level of the reproduced video signal based on the RS level correction information transferred from the variable speed reproduction level correction information storage means 89. The level correction information creation control means 86 switches the selector 85 so as to select the output of the normal reproduction level correction means 81 during normal reproduction and the output of the variable reproduction time level correction means 90 during variable speed reproduction.

As described above, the means for correcting the level of the reproduced video signal during the normal reproduction and the variable speed reproduction are provided respectively, and the level is corrected using the reference data obtained during the normal reproduction.
Since the FS or RS level correction information is transferred at the time of variable speed reproduction and the level correction is performed based on the level correction information, the same effect as the embodiment of FIG. 37 is obtained.

In the embodiment shown in FIG. 41, during variable speed reproduction,
The example in which the switch 84 is provided so that the reference data is not input to the level correction means 81 during the normal reproduction is shown.
As in the other cases, the normal correction level correction means 81 may be configured so that the level correction information during normal reproduction is not updated during variable speed reproduction, and the same effect as the embodiment of FIG. 41 is achieved. .

In the above embodiment, the example in which the updating of the level correction information is prohibited by the reference data obtained during the variable speed reproduction has been described. However, if the level correction information is sequentially updated by the obtained reference data, Further effects can be expected.

Further, in the above embodiment, an example in which the level correction information of one reproduction speed for each of FS and RS is obtained in advance and the level of the reproduced video signal is corrected based on the level correction information has been described. The level of the reproduced video signal may be corrected based on the level correction information corresponding to one or more reproduction speeds.

Further, in the above embodiment, as the level correction method during normal reproduction, the digital data of the reproduction reference pulse is used as an address, the corresponding pulse height data is written in the memory, and the output data of the reproduction A / D converter 5 is obtained. An example using the method of reading the corrected value from the memory as the address has been described. For example, the difference between the reproduction reference pulse data and the pulse height data is written in the memory as the correction data, and the reproduction A / D conversion is performed. Using the output data of the device 5 as an address, the correction data is read from the memory and added to the output data of the reproduction A / D converter 5,
A level correction method or another level correction method may be used, such as creating level correction data by software using a microcomputer and interpolating the data when a discontinuity occurs in the level correction data.

Further, in the above-mentioned embodiment, an example in which the data of the reproduction reference pulse obtained at the time of reproduction is used as it is has been described. However, the means for averaging and smoothing the data of the reproduction reference pulse of a plurality of times and the dropout are generated. Further effects can be expected by using a means such as not using the reproduction reference pulse data in such a case.

[0138]

As described above, according to the present invention, the reference pulse corresponding to each level of the recorded video signal, the height data for discriminating the reference pulse, the minimum and maximum levels of the recorded video signal, or the vicinity of the black level. Create and insert a reference signal such that a level near the white level exists. When creating new level correction information, the level correction information is created using the reproduced reference signal, and this level correction information is then corrected using the reference pulse and pulse height data obtained from the reproduced video signal. Since the information is sequentially updated and the level of the reproduced video signal is corrected, there is an effect that a good reproduced image can be instantaneously obtained even when starting reproduction or shifting from variable speed reproduction to normal reproduction. .

Further, according to the present invention, since a signal used for reproduction such as a horizontal or vertical synchronizing signal or a burst signal is used as the reference signal, a new area for recording the reference signal is formed. You do n’t have to
There is an effect that the recorded video signal can be effectively utilized.

According to the present invention, the rotary drum has 18
Two sets of n heads (n = 1, 2, 3, 3, facing each other at 0 degrees)
...) Installation, recording a 1-field or 1-frame video signal by dividing it into n × m (m is an odd number) tracks,
In a VTR that is adapted to reproduce, each head stores reference data corresponding to all video signals, and at the time of reproduction, level correction is performed for each head using the reference data obtained from the video signals reproduced by each head. Since the above configuration is adopted, there is an effect that the characteristic difference of each head can be corrected and a good reproduced image can be obtained.

Further, according to the present invention, level correction information corresponding to at least normal reproduction, FS, and RS is provided, and created using only the reference data obtained at the reproduction speed corresponding to each level correction information, Since it is configured to be updated, each level correction information is not updated by the reference data obtained at other reproduction speeds, and is maintained during other reproduction speeds, so that it is suitable for normal reproduction and variable speed reproduction. It is possible to obtain a characteristic correction device capable of performing level correction and instantaneously obtaining a good level-corrected reproduced image even if the reproduction speed changes.

Further, according to the present invention, level correction information is created using reference data obtained from the reproduced video signal during normal reproduction, and the reproduced video signal is level-corrected based on the level correction information. The level correction information for the normal playback just before the playback and the current playback speed are used to obtain the level correction information for that playback speed, and the level of the playback video signal is corrected based on the level correction information. Since the level correction information is stored, good level correction can be performed during normal reproduction and variable speed reproduction, and even if the reproduction speed changes, a good level-corrected reproduced image can be obtained instantly. There is an effect that the correction device can be obtained.

According to the present invention, the pulse height data corresponding to the plurality of reference pulses is used as the reference data, and the average value of the plurality of reference pulses is set to the gray level of the video signal. The effect of is reduced, and the characteristics of the reference data and the video signal become substantially equal, which has the effect of enabling accurate level correction.

According to the present invention, the level correction is performed by using the correction signal obtained from the reproduced video signal during the normal reproduction, and the update of the level correction information is prohibited by using the reproduced correction signal during the variable speed reproduction. I configured it to
During the variable speed reproduction, the level correction information for the immediately preceding normal reproduction is retained, so during the variable speed reproduction, the level correction operation does not cause deterioration of the reproduced image, and the period is good even after the transition from the variable speed reproduction to the normal reproduction. There is an effect that a characteristic correction device that provides a reproduced image of various types can be obtained.

Further, according to the present invention, level correction information is created using reference data obtained from the reproduced video signal during normal reproduction, and the reproduced video signal is level-corrected based on the level correction information, and during variable speed reproduction. The playback video signal is level-corrected based on the level correction information corresponding to the playback speed that was previously obtained, and the level correction information during normal playback is retained during the variable-speed playback period, so variable-speed playback is also performed during normal playback. There is an effect that it is possible to obtain a characteristic correction device capable of performing good level correction even at times and obtaining a good level-corrected reproduced image even if the reproduction speed changes.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a recording system and a reproducing system of a characteristic correction device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a reference signal used in the first embodiment.

FIG. 3 is a diagram showing an example of an output of the recording system of the first embodiment.

FIG. 4 is a diagram showing another example of the output of the recording system of the first embodiment.

FIG. 5 is a diagram showing still another example of the output of the recording system of the first embodiment.

FIG. 6 is a diagram showing still another example of the output of the recording system of the first embodiment.

FIG. 7 is a diagram showing still another example of the output of the recording system of the first embodiment.

FIG. 8 is a diagram showing another example of the reference signal used in the first embodiment.

FIG. 9 is a diagram showing still another example of the reference signal used in the first embodiment.

FIG. 10 is a diagram showing an output of a recording system when a vertical synchronizing signal is used as a reference signal in the first embodiment.

FIG. 11 is a diagram showing an output of the recording system when a horizontal synchronizing signal is used as a reference signal in the first embodiment.

FIG. 12 is a diagram showing an output of a recording system when a burst signal is used as a reference signal in the first embodiment.

FIG. 13 is a block diagram showing a configuration of a reproduction system of a characteristic correction device according to a second embodiment of the present invention.

FIG. 14 is a diagram for explaining the operation of the recording system of the second embodiment.

FIG. 15 is a diagram showing a recording state on a recording medium in a second embodiment.

FIG. 16 is a diagram showing an example of an output of the recording system of the second embodiment.

FIG. 17 is a diagram showing another example of the output of the recording system of the second embodiment.

FIG. 18 is a block diagram showing the configuration of another example of the reproduction system of the characteristic correction device according to the second embodiment.

FIG. 19 is a block diagram showing a configuration of a reproduction system of a characteristic correction device according to a third embodiment of the present invention.

20 is a block diagram showing an example of a specific configuration of the level correction means 30 in FIG.

21 is a block diagram showing another example of a specific configuration of the level correction means 30 in FIG.

22 is a block diagram showing still another example of the specific configuration of the level correction means 30 in FIG.

FIG. 23 is a block diagram showing a configuration of a reproduction system of a characteristic correction device according to a fourth embodiment of the present invention.

24 is a block diagram showing an example of a specific configuration of the level correction means 50 in FIG.

FIG. 25 is a block diagram showing another example of a specific configuration of the level correction means 50 in FIG.

FIG. 26 is a block diagram showing still another example of the specific configuration of the level correcting means 50 in FIG. 23.

FIG. 27 is a diagram for explaining the operation of the recording system of the characteristic correction device according to the fifth embodiment of the present invention.

FIG. 28 is a diagram showing an example of the output of the recording system of the fifth embodiment.

FIG. 29 is a diagram showing another example of the output of the recording system of the fifth embodiment.

FIG. 30 is a diagram showing still another example of the output of the recording system of the fifth embodiment.

FIG. 31 is a diagram showing the reproduction output of the fifth embodiment.

FIG. 32 is a block diagram showing a configuration of a reproduction system of a characteristic correction device according to a sixth embodiment of the present invention.

FIG. 33 is a diagram showing another example of the reproduction system of the characteristic correction device according to the sixth embodiment.

FIG. 34 is a diagram showing still another example of the reproduction system of the characteristic correction device according to the sixth embodiment.

FIG. 35 is a diagram showing still another example of the reproduction system of the characteristic correction device according to the sixth embodiment.

FIG. 36 is a block diagram showing the structure of a reproduction system of a characteristic correction device according to a seventh embodiment of the present invention.

FIG. 37 is a block diagram showing an example of a specific configuration of the level correction means in FIG. 36.

FIG. 38 is a diagram showing level correction information of the characteristic correction device according to the seventh example.

FIG. 39 is a block diagram showing another example of a specific configuration of the level correcting means in FIG. 36.

FIG. 40 is a block diagram showing still another example of the specific configuration of the level correction means in FIG. 36.

41 is a block diagram showing still another example of the specific configuration of the level correction means in FIG. 36. FIG.

FIG. 42 is a block diagram showing a configuration of a recording system and a reproducing system of a conventional characteristic correction device.

FIG. 43 is a diagram for explaining the operation of the recording system of the conventional example.

FIG. 44 is a diagram for explaining the operation of the recording system of the conventional example.

FIG. 45 is a diagram showing an output of a recording system of a conventional example.

FIG. 46 is a diagram for explaining the operation of the reproduction system of the conventional example.

[Fig. 47] Fig. 47 is a diagram for explaining an example of a channel division recording method in the signal recording device.

FIG. 48 is a diagram for explaining the problems of the conventional example.

FIG. 49 is a diagram for explaining a problem of the conventional example.

FIG. 50 is a block diagram showing a configuration of a characteristic correction device of a second conventional example.

FIG. 51 is a diagram for explaining the operation of the characteristic correction device of the second conventional example.

FIG. 52 is a diagram for explaining a problem of the characteristic correction device of the second conventional example.

[Explanation of symbols]

1 Gate pulse generation means 2 Reference pulse generation means 3 Pulse height data generation means 4 Reference data insertion means 5 Playback A / D converter 6 Pulse height data selection means 7 Reference pulse selection means 8, 30, 50, 80 Level correction means 9 Playback DA converter 10 Reference signal creation / insertion means 11 Reference signal selection means 20 Correction means switching means 21, 35, 40, 54, 85 selector 22 Level correction means A 23 Level correction means B 24, 36, 41, 53, 61, 68, 84 switches 31,86 Level correction information creation control means 32,81 Level correction means during normal reproduction 33,82 FS level correction means 34,83 RS level correction means 37,87 Level correction means 38, 42, 88 level correction information storage means 39,90 Level correction means during variable speed reproduction 51 Normal playback level correction means 52 Level correction means during variable speed reproduction 55 Level correction information creation control means 56 Level correction means 57 level correction information storage means 58 Level correction information creating means for variable speed reproduction 60 Update prohibition means 89 Variable-speed playback level correction information storage means

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 17, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

Further, since the conventional characteristic correction device is constructed as described above, it has the following problems. For example, when the height of the reference pulse is at the black level and the white level, the reproduced signals are affected by the sag, respectively.
, (B) tends to occur. This is because the average level of the video signal is almost gray level and constant, but the average level of the reference data is almost the quantization level of the reference pulse, which causes the influence of sag. As described above, the reference data composed of the pulse height data corresponding to the reference pulse having a certain time width is easily affected by the sag. Further, since the influence of the sag of the reproduced reference data differs depending on the value of the reference pulse, the characteristics of the level change of the recorded / reproduced video signal and the level change of the reference data are different, and a good correction operation cannot be performed. . In particular, the characteristics greatly differ near the maximum or minimum level of the video signal.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

[0023]

A characteristic correction device according to the present invention comprises a reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and the reference pulse. Pulse height data generating means for generating pulse height data for identifying the value of, and a set of reference data consisting of a predetermined number of reference pulses and pulse height data corresponding to the predetermined number of reference pulses. Reference data inserting means to be inserted within the blanking period of the recorded video signal, and a reference signal having a level near the minimum and maximum levels of the recorded video signal or near the black level and the white level are inserted into the recorded video signal. It is obtained from the reference signal insertion means and the reproduced video signal when the level correction information is newly created such as when the reproduction is started or when the variable speed reproduction is changed to the normal reproduction. Calculating a level correction information using the quasi-signal, it updates the level correction information using <br/> the reference data obtained from further regeneration video signals, provided the level correction means for level correction of the reproduced video signal It is a thing.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

Further, the characteristic correction device according to the present invention includes the reference pulse generating means for generating the reference pulse corresponding to at least the black level to the white level of the recorded video signal, and the pulse for discriminating the predetermined number of reference pulses. Pulse height data generating means for generating height data, reference data inserting means for inserting pulse height data corresponding to a predetermined number of reference pulses as reference data within a blanking period of a recorded video signal, and at least normal reproduction The level correction information corresponding to the time, FS, and RS is created, and the level correction information corresponding to the normal reproduction is created with reference data obtained from the video signal at the normal reproduction. Similarly, the correction information at the FS is F
Created with reference data at S, level correction information at RS is created with reference data at RS, and a video signal reproduced at each reproduction speed is level-corrected using level correction information corresponding to the reproduction speed. And a level correcting means for performing.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

[0030]

According to the present invention, the reference pulse corresponding to each level of the recorded video signal, the pulse height data for identifying the reference pulse, and the levels near the minimum and maximum levels of the recorded video signal or near the black level and the white level. Is inserted in the blanking period of the recorded video signal, and when the level correction information is newly created, the level correction information is created using the reproduced reference signal. The level correction information is sequentially updated using the reference pulse and pulse height data obtained from the playback video signal, and the playback video signal is level-corrected. It is possible to instantly obtain a good reproduced image even when making a transition.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

Further, in the present invention, n heads (n = 1, 2,
3, ...) Mounting, in a VTR in which a video signal of one field or one frame is divided into n × m (m is an odd number) tracks for recording and reproducing, each head corresponds to all the video signals. the reference data as serial to record, since each head at the time of reproduction is configured to level correction using the reference data obtained from the video signal for each head to be reproduced, good to correct the characteristic difference of each head A reproduced image can be obtained.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

Further, according to the present invention, level correction information is created using reference data obtained from the reproduced video signal during normal reproduction, and the reproduced video signal is level-corrected based on the level correction information. The level correction information of the normal playback just before the playback and the current playback speed are used to calculate the level correction information of the playback speed, and the level of the playback video signal is corrected based on the level correction information. Since the level correction information for normal reproduction is held, good level correction can be performed during normal reproduction and variable speed reproduction, and good level correction can be performed instantaneously even when the reproduction speed changes.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction content]

As described above, in the present embodiment, the reference pulse corresponding to each level of the recorded video signal, the pulse height data for identifying the reference pulse, and the reference signal such that the minimum and maximum levels of the recorded video signal exist. When creating and inserting a new level correction information, create the level correction information using the reproduced reference signal, and refer to this level correction information as the reference pulse and pulse height obtained from the reproduced video signal. Since the level correction information is sequentially updated using the data and the level of the reproduced video signal is corrected, a good reproduced image can be obtained instantly even when starting reproduction or shifting from variable speed reproduction to normal reproduction. be able to.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction content]

As described above, one or a plurality of signals whose levels at the time of recording can be discriminated during reproduction are used as reference signals.
If you use this to create level correction information,
Similar to the case where a reference signal is newly generated and inserted as described above, a good reproduced image can be instantaneously obtained even when reproduction is started or when variable speed reproduction is changed to normal reproduction. Furthermore, by using a signal used for normal recording / reproduction, such as a vertical synchronizing signal, a horizontal synchronizing signal, or a burst signal, as a reference signal, it is not necessary to provide a new area for recording the reference signal, and the recording video signal Can be effectively utilized.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction content]

Next, the operation will be described with reference to FIGS. 13 to 15. In the recording system of this embodiment, the gate pulse generating means 1 generates the gate pulse GP in the same manner as the conventional example (see FIG. 14 (a)). When the gate pulse GP becomes high, the reference pulse generating means 2 generates the reference pulse RP having 0/255 and a high quantization level. The pulse height data generating means 3 generates the pulse height data HD which is the quantized data in the serial format corresponding to the reference pulse RP having the height of the quantization level of 0/255. Next, when the gate pulse GP becomes high, the reference pulse generating means 2 generates a reference pulse having the same 0/255 quantization level (see FIG. 14 (b)), and the pulse height data generating means 3 generates the reference pulse. Pulse height data corresponding to RP is generated (see FIG. 14 (c)). After that, the gate pulse GP becomes high.
Reference pulse generating means 2 to increase the quantization level of the reference pulse RP by one quantization level for each that, by generating a reference pulse RP having a height of the same quantization level twice in succession (1/255, 1/255, 2/255, 2/255,
... 254 / 255,254 / 255,255 / 255
255/255), the quantization levels of all recorded video signals are generated. The pulse height data generation means 3 generates the pulse height data HD corresponding to the reference pulse RP which increases by one quantization level at the same quantization level twice each time the gate pulse GP goes high. The pulse height data HD corresponding to the reference pulse RP is used as the reference data RD (see FIG. 14 (d)), and the reference data inserting means 4 inserts the reference data RD in the vertical blanking period.
An output signal such as 5 is obtained. This output signal is recorded through the recording system circuit.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0058

[Correction method] Change

[Correction content]

[0058] Then, a video signal reproduced by the video signal reproduced by the head A that received the level correction and the head B is synthesized by the switch 24, the playback D / A variant exchanger 9 D / A
When converted, a reproduced video signal whose level is corrected for each head can be obtained.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0059

[Correction method] Change

[Correction content]

[0059] Thus, in this embodiment, the reference data corresponding to all of the video signals in each head so as serial to record, at the time of reproduction using the reference data obtained from a video signal each head reproduces the heads Since the level correction is performed for each of the heads, it is possible to correct the characteristic difference between the heads and obtain a good reproduced image.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0063

[Correction method] Change

[Correction content]

Further, in the embodiment shown in FIG. 13, as the level correction method, the pulse height data corresponding to the A / D data of the reproduction reference pulse as an address is written in the memory to create the correction table for each head. Regarding an example using a system in which the output data of the reproduction A / D converter 5 is allocated by the reproducing head during the normal video period and the corrected value is read from the memory as the address of the correction table of each head It has been described, in the other of <br/> level correction method, writing into the memory the difference between the playback reference pulse data and the pulse height data as correction data for example, reproducing a / D converter in a normal video period The correction data is read from the memory by using the output data of the converter 5 as an address, and is added to the output data of the reproduction A / D converter 5 to correct the level. Further, another level correction method such as creating level correction data by software using a microcomputer and interpolating the data when a discontinuity occurs in the level correction data may be used.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction content]

In the above embodiment, the rotary drum has 180
A VTR that arranges two heads facing each other and records a video signal of one field by dividing it into three tracks.
The case of applying to a VTR
In addition to the above case, n sets (n = 1, 2, 3 ...) Of two heads opposed to the rotary drum by 180 ° are arranged, and one field or one frame of video signal is n × m (m is an odd number).
In a VTR that is divided into and recorded on
The characteristic correction device uses 2n heads to record reference data corresponding to the quantization levels of all video signals.
If level correction means corresponding to each head is provided and the correction means switching means is configured to distribute the reference data reproduced by each head to the level correction means corresponding to each head, the same as in the embodiment shown in FIG. Produce an effect.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0068

[Correction method] Change

[Correction content]

FIG. 20 shows the level correction means 3 in FIG.
It is a block diagram which shows the detailed structure of 0. In the figure,
Reference numeral 32 is a normal reproduction level correction means for correcting the level of the reproduced video signal using only the reference data obtained from the normal reproduction video signal, and 33 is a reproduced image using only the reference data obtained from the FS video signal. FS at the level correction means for level correction signal, RS when the level correcting means 34 for level correction of the reproduced video signal by using only the reference data obtained from the video signal at the time of RS, 35 is that obtained from the reproduced video signal reference A selector for allocating the data to either the normal reproduction level correction means 32, the FS time level correction means 33, or the RS time level correction means 34 according to the reproduction speed.
A switch 6 determines which level correction means output is selected according to the reproduction speed.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0069

[Correction method] Change

[Correction content]

Next, the operation will be described. Reference data is created using the circuit of FIG. 32 (a) in the same manner as the conventional example, and is inserted into the recorded video signal. When the reproduction speed identification signal indicates the reproduction at the normal speed, the level correction information creation control means 31 operates the selector 35 to input the reference data obtained from the reproduced video signal only to the normal reproduction level correction means 33. To do so. The normal reproduction level correction means 32 uses the obtained reference data to create level correction information corresponding to normal reproduction, and uses the level correction information to correct the level of the reproduced video signal. Note Since FS at levels complement <br/> positive means 33 and RS at the level correcting means 34 reference data is not input, the level correction information corresponding to at FS when the RS is not changed. Level correction information creation control means 3
1 controls the switch 36 so as to select the reproduced video signal subjected to the level correction by using the corresponding level correction information at the time of normal reproduction, and outputs it to the reproduction D / A converter 9. The reproduction D / A converter 9 performs D / A conversion to obtain a level-corrected reproduction video signal. The method of correcting the level of the reproduced video signal is the same as in the conventional example.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Name of item to be corrected] 0072

[Correction method] Change

[Correction content]

As described above, in the present embodiment, the normal reproduction level correction means 32, the FS time level correction means 33, and the RS time level correction means 34 are provided, and the selector 35 is switched according to the reproduction speed to determine which level correction means. Select whether or not to input the reference data to, the level correction information is updated only in the level correction means to which the reference data is input, and the reproduced video signal is level-corrected based on the level correction information. Since it is configured to be held, a good level-corrected reproduced image can be instantaneously obtained even if the reproducing speed changes.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0074

[Correction method] Change

[Correction content]

Next, the operation will be described. When the reproduction speed identification signal indicates normal reproduction, the level correction means 37
Uses the reference data obtained from the reproduced video signal to create level correction information corresponding to normal reproduction, and uses the level correction information to correct the level of the reproduced video signal. When shifting from normal reproduction to FS, the level correction information creation control means 31 saves and stores the level correction information in the current level correction means 37 (level correction information corresponding to normal reproduction) in the level correction information storage means 38, returning the level correction information corresponding to the level correction information storage unit 38 at the time of FS in level <br/> Le correction means 37. After that, the level correction means 37
Updates the reference data obtained this level correction information, the level is corrected on the basis of the reproduced video signal to the level correction information. The level correction information in the current level correction means 37 is saved and stored in the level correction information storage means 38 at every transition between normal reproduction, FS reproduction, and RS reproduction, and the level corresponding to the current reproduction speed is stored. The correction information is returned to the level correction means 37.

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0076

[Correction method] Change

[Correction content]

Further, the level correction means 30 in FIG. 19 can also be constructed as shown in FIG. In FIG. 22,
Reference numeral 39 is a level correction means during variable speed reproduction for level-correcting the reproduced video signal using only reference data obtained from the video signal during variable speed reproduction, and 40 is reference data obtained from the reproduced video signal depending on whether normal reproduction or variable speed reproduction. And a selector for allocating to the normal reproduction level correction means 32 or the variable speed reproduction level correction means 39. Reference numeral 41 indicates either the normal reproduction level correction means 32 or the variable speed reproduction level correction means 39 according to the normal reproduction or the variable speed reproduction. Switch to decide which to select,
Reference numeral 42 is a level correction information storage means for storing the level correction information corresponding to the FS time and the RS time created by the variable speed reproduction level correction means 39. The normal reproduction level correction means 32 is the same as that shown in FIG.

[Procedure Amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0078

[Correction method] Change

[Correction content]

When the normal reproduction is shifted to the FS, the level correction information creation control means 31 operates the selector 40 to input the reference data to the normal reproduction level correction means 32 and the variable reproduction level correction means 39. varied as input to the save level correction information for the current speed reproduction level correcting means within 39 level correction information broom憶unit 42, is stored, the level corresponding the level correction information storage unit 42 when FS correction The information is returned to the level correcting means 39 during variable speed reproduction. After that, the variable speed reproduction level correction means 39 updates this level correction information with the reference data that can be obtained, and corrects the level of the reproduced video signal based on this level correction information. Below, from normal playback to FS playback or RS playback,
Alternatively, every time the transition between FS reproduction and RS reproduction is made, the level correction information in the current variable speed reproduction level correction means 39 is saved and stored in the level correction information storage means 42, and the level correction information corresponding to the current reproduction speed is stored. To the level correcting means 39 during variable speed reproduction.

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0080

[Correction method] Change

[Correction content]

In the above-described embodiment, the normal reproduction, the FS, and the RS are divided into three areas according to the reproduction speed , level correction information corresponding to each area is created, and the reference data obtained during the normal reproduction corresponds to the normal reproduction. The level correction information is updated, similarly, the level correction information corresponding to the FS time is updated with the reference data during the FS, and the level correction information corresponding to the RS time is updated with the reference data during the RS time. Although the video signal of the corresponding reproduction speed is level-corrected based on the above, the FS and the RS are divided into two or more areas depending on the difference in the reproduction speed.
Similar to the configuration of 0, level correction means corresponding to each area may be provided to generate level correction information corresponding to each area, and the reproduced video signal may be level corrected by this.
Further, in this way, FS and RS are divided into two or more regions depending on the difference in reproduction speed, and when the reproduction speed changes, the level correction information corresponding to each region is saved and stored as in the case of FIG. 21 and FIG. It may be configured to return.

[Procedure correction 21]

[Document name to be amended] Statement

[Correction target item name] 0081

[Correction method] Change

[Correction content]

In the above embodiment, as the level correction method, the reproduction reference pulse digital data is used as the write address, the corresponding pulse height data is written in the memory, and the output data of the reproduction A / D converter 5 is used as the read address. as it has been described example using a method called reading the corrected value from the memory but, for example, the difference between the data and the pulse height data of the reproduced reference pulse writing in the memory as correction data, the reproducing a / D converter 5 Using the output data as an address, the correction data is read out from the memory and added to the output data of the reproduction A / D converter 5 to perform level correction, or the level correction data is created by software using a microtamper, If there are discontinuities in the level correction data, use another level correction method such as interpolating the data. It can have.

[Procedure correction 22]

[Document name to be amended] Statement

[Correction target item name] 0089

[Correction method] Change

[Correction content]

In the above embodiment, the switch 53 is provided so that the reference data is not inputted to the level correcting means 51 during the normal reproduction during the variable speed reproduction.
As described above, the level correction information creation control means 55 may be controlled so as not to update the level correction means 51 during normal reproduction during variable speed reproduction, and the same effect as the above-described embodiment is obtained.

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0094

[Correction method] Change

[Correction content]

Further, in the above-described embodiment, as the level correction method during normal reproduction, the reproduction reference pulse digital data is used as the write address, the corresponding pulse height data is written in the memory, and the output of the reproduction A / D converter 5 is output. Although the data as a read address was described an example of using the method of reading the memory corrected value, for example, writes to the memory the difference between the data and the pulse height data of the reproduced reference pulse as the correction data, reproducing a / D converter The correction data is read from the memory by using the output data of the device 5 as an address, and the level correction data is added to the output data of the reproduction A / D converter 5 to correct the level. Create other level correction data such as interpolating data when discontinuity occurs in the level correction data. Method may be used.

[Procedure correction 24]

[Document name to be amended] Statement

[Correction target item name] 0095

[Correction method] Change

[Correction content]

[0095] In the above embodiment has been describes the example using as the data of the reproduced reference pulses obtained during reproduction, averaging the data of a plurality of times of reproduction reference pulse,
Further smoothing effect can be expected by using a means such as not using the reproduction reference pulse data when dropout occurs.

[Procedure correction 25]

[Document name to be amended] Statement

[Correction target item name] 0103

[Correction method] Change

[Correction content]

As shown in the recorded video signal of FIG. 29,
Only a plurality of reference pulses may be inserted in one horizontal period, and pulse height data may be inserted in the next one horizontal period. Alternatively, as shown in the recorded video signal of FIG. 30, a plurality of reference pulses may be inserted after the pulse height data. Thus by inserting a pulse height data corresponding to the plurality of reference pulses in the blanking period, it is selected so that the average value of the plurality of reference pulse becomes a gray level of approximately video signal, throat pattern such as May be obtained, and the same effect as that of the above-described embodiment can be obtained.

[Procedure Amendment 26]

[Document name to be amended] Statement

[Name of item to be corrected] 0138

[Correction method] Change

[Correction content]

[0138]

As described above, according to the present invention, the reference pulse corresponding to each level of the recorded video signal, the pulse height data for discriminating the reference pulse, the minimum and maximum levels of the recorded video signal, or the vicinity of the black level. And a reference signal having a level near the white level is created and inserted. When creating a level correction information to new creates a level correction information using the reference signal reproduced level using the level correction information reproduced video signal or we obtained the reference pulse and the pulse height data below sequentially updating the correction information, than was configured to level corrected reproduced video signal, the effect capable of obtaining a good reproduced image instantly even such as when shifts to the normal reproduction from and variable speed playback when starting the reproduction is there.

[Procedure Amendment 27]

[Document name to be amended] Statement

[Correction target item name] 0140

[Correction method] Change

[Correction content]

According to the present invention, the rotary drum has 18
Two sets of n heads (n = 1, 2, 3, 3, facing each other at 0 degrees)
...) Installation, recording a 1-field or 1-frame video signal by dividing it into n × m (m is an odd number) tracks,
In VTR which is adapted to reproduce the reference data corresponding to all of the video signals in each head so as serial to record, level correction at the time of reproduction using the reference data which each head is obtained from the video signal to be reproduced for each head Since such a configuration is adopted, there is an effect that the characteristic difference of each head can be corrected and a good reproduced image can be obtained.

[Procedure correction 28]

[Document name to be amended] Statement

[Name of item to be corrected] 0142

[Correction method] Change

[Correction content]

Further, according to the present invention, level correction information is created using reference data obtained from the reproduced video signal during normal reproduction, and the reproduced video signal is level-corrected based on the level correction information. The level correction information for the normal playback just before the playback and the current playback speed are used to obtain the level correction information for that playback speed, and the level of the playback video signal is corrected based on the level correction information. Since the level correction information is stored, good level correction can be performed during normal reproduction and variable speed reproduction, and even if the reproduction speed is changed, a good level-corrected reproduced image can be obtained instantly. There is an effect that the correction device can be obtained.

[Procedure correction 29]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

5 is a diagram showing still <br/> another example of the output of the recording system of the first embodiment.

[Procedure amendment 30]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

6 is a diagram showing still <br/> another example of the output of the recording system of the first embodiment.

[Procedure correction 31]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

7 is a diagram showing still <br/> another example of the output of the recording system of the first embodiment.

[Procedure correction 32]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Description of Reference Signs] 1 gate pulse generating means 2 reference pulse generating means 3 pulse height data generating means 4 reference data inserting means 5 reproduction A / D converter 6 pulse height data selecting means 7 reference pulse selecting means 8, 30, 50, 80 level correction means 9 reproduction D / A converter 10 reference signal creation / insertion means 11 reference signal selection means 20 correction means switching means 21, 35, 40, 54, 85 selector 22 level correction means A 23 level correction means B 24, 36, 41, 53, 61, 68, 84 Switch 31, 86 Level correction information creation control means 32, 81 Normal reproduction level correction means 33, 82 FS level correction means 34, 83 RS level correction means 37, 87 level correction means 38, 42, 88 level correction information storage means 39, 90 variable speed reproduction level correction means 51 Time level correction means 52 variable speed reproduction level correction means 55 level correction information creation control means 56 level correction means 57 level correction information storage means 58 variable speed reproduction level correction information creation means 60 update prohibition means 89 variable speed reproduction level correction information storage means ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 6

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 7

[Correction method] Change

[Correction content]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Next, the operation will be described with reference to FIGS. 42 to 46. Here, it is assumed that the recorded video signal is quantized by 8 bits. During recording, the gate pulse generator 1 separates the vertical and horizontal sync signals from the recorded video signal (see FIG. 43 (a)). And vertical sync signal (see Fig. 43 (b))
A gate pulse GP (see FIGS. 43 (c) and 44 (a)) which becomes high in one horizontal period after three horizontal periods is generated.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Further, since the conventional correction device is configured as described above, for example, when the video signal is divided into two channels and the video signal of one field is recorded on two tracks, the reference data is different from each other. While being inserted into the vertical blanking interval of the channel of the video signal, when reproduced at a speed different from this normal playback speed, it becomes reproducing head locus as shown in FIG. 4 8, the value of the reference data from the reproduced video signal Since it can only be obtained at random intervals, the value of certain reference data may remain unobtainable. For this reason, there has been a problem that the reproduction image quality is deteriorated by the level correction during variable speed reproduction.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Further, the characteristic correcting apparatus according to the present invention distinguishes the reference pulse from the reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least the black level to the white level of the recorded video signal. A means for generating pulse height data for generating pulse height data and a plurality of reference pulses and pulse height data corresponding to the reference pulses are selected so that the average level of the reference data is almost equal to the gray level of the video signal. Reference data insertion means for inserting the reference data in the blanking period of the video signal,
The level correction means for correcting the level of the reproduced video signal is provided by using the reference data obtained from the reproduced video signal.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

In the present invention, level correction information corresponding to at least normal reproduction, FS and RS is provided, and each level correction information is created using only reference data obtained at the corresponding reproduction speed. Since it is configured to be updated, each level correction information is not updated by the reference data obtained at other reproduction speeds, and is maintained during other reproduction speeds, so that it is suitable for normal reproduction and variable speed reproduction. Level correction can be performed, and good level correction can be instantly performed even if the reproduction speed changes.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

Further, in the present invention, during normal reproduction, the level correction means performs level correction by using the correction signal from which the reproduced video signal is obtained, and during variable speed reproduction, the update prohibiting means prohibits updating of the level correction information. However, since the level correction information for the previous normal playback is retained, the speed change
When live, there is no deterioration in playback image quality due to level correction, and shifting
Instantly good level correction even when switching from playback to normal playback
The reproduced image thus obtained is obtained.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

[0038] Next, the operation will be described with reference to FIGS. In the recording system shown in FIG. 1 (a), the gate pulse generating means 1, the reference pulse generating means 2, the pulse height data generating means 3, and the reference data inserting means 4 are used to perform the reference pulse and the reference pulse in the same manner as in the conventional example. The pulse height data for identifying is inserted in one horizontal period of the vertical blanking period of the recorded video signal. Reference signal creating / inserting means 10
Creates a reference signal having a quantization level of 0/225 and 255/255 as shown in FIG. 2, and the reference pulse in the vertical blanking period of the recorded video signal and the horizontal period in which the pulse height data is inserted Insert within the next horizontal period. Thus, as shown in FIG. 3, the output signal in which the reference pulse, the pulse height data, and the reference signal are inserted is recorded through the recording system circuit.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction content]

As described above, in the present embodiment, the reference pulse corresponding to each level of the recorded video signal, the pulse height data for identifying the reference pulse, and the reference signal such that the minimum and maximum levels of the recorded video signal exist. When creating and inserting a new level correction information, create the level correction information using the reproduced reference signal, and refer to this level correction information as the reference pulse and pulse height obtained from the reproduced video signal. data sequentially updates the level correction information using, than was configured to level corrected reproduced video signal to obtain a satisfactory reproduced image instantly even such as when shifts to the normal reproduction from and variable speed playback when starting the reproduction be able to.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction content]

As described above, one or a plurality of signals whose levels at the time of recording can be discriminated during reproduction are used as reference signals.
If you use this to create level correction information,
Just as inserting forms newly created as a reference signal, as described above, it is possible to obtain a satisfactory reproduced image instantly even such as when shifts to the normal reproduction from and variable speed playback when starting playback. Furthermore, by using a signal used for normal recording / reproduction, such as a vertical synchronizing signal, a horizontal synchronizing signal, or a burst signal, as a reference signal, it is not necessary to provide a new area for recording the reference signal, and the recording video signal Can be effectively utilized.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction content]

[0054] Next, the operation will be described with reference to FIGS. 13 to 15. In the recording system of this embodiment, the gate pulse generating means 1 generates the gate pulse GP in the same manner as the conventional example (see FIG. 14 (a)). When the gate pulse GP becomes high, the reference pulse generating means 2 generates the reference pulse RP having 0/255 and a high quantization level. The pulse height data generating means 3 generates the pulse height data HD which is the quantized data in the serial format corresponding to the reference pulse RP having the height of the quantization level of 0/255. Next, when the gate pulse GP becomes high, the reference pulse generating means 2 has the same 0 /
A reference pulse having a high quantization level of 255 is generated (see FIG.
4 (b)), the pulse height data generating means 3 generates pulse height data corresponding to the reference pulse RP (FIG. 14).
(See (c)). After that, each time the gate pulse GP becomes high, the reference pulse generating means 2 increases the quantization level of the reference pulse RP by one quantization level and generates the reference pulse RP having the same quantization level twice in succession. Then (1/2
55, 1/255, 2/255, 2/255, ... 254
/ 255,254 / 255,255 / 255,255 /
255), the quantization levels of all recorded video signals are generated. The pulse height data generation means 3 generates the pulse height data HD corresponding to the reference pulse RP which increases by one quantization level at the same quantization level twice each time the gate pulse GP goes high. The pulse height data HD corresponding to the reference pulse RP is used as the reference data RD (see FIG.
(See (d)), the reference data inserting means 4 inserts the reference data RD in the vertical blanking period to obtain an output signal as shown in FIG. 45 of the conventional example. This output signal is recorded through the recording system circuit.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0062

[Correction method] Change

[Correction content]

Further, as shown in the recorded video signal of FIG. 16, only one or a plurality of reference pulses are generated in one horizontal period.
The corresponding pulse height data may be inserted within the next one horizontal period. Alternatively, as shown in the recorded video signal of FIG. 17, the pulse height data may be inserted first, followed by one or more reference pulses . Any pattern may be used as long as the pulse height data corresponding to one or a plurality of reference pulses is inserted in the blanking period, and the same effect as the embodiment shown in FIG. 14 is obtained. Play.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0069

[Correction method] Change

[Correction content]

Next, the operation will be described. Similar to the conventional example, reference data is created using the circuit of FIG. 42 (a) and inserted into the recorded video signal. When the reproduction speed identification signal indicates the reproduction at the normal speed, the level correction information creation control means 31 operates the selector 35 to input the reference data obtained from the reproduced video signal only to the normal reproduction level correction means 33. To do so. The normal reproduction level correction means 32 uses the obtained reference data to create level correction information corresponding to normal reproduction, and uses the level correction information to correct the level of the reproduced video signal. Since no reference data is input to the FS time level correction means 33 and the RS time level correction means 34, the level correction information corresponding to the FS time and the RS time is not changed. Level correction information creation control means 3
1 controls the switch 36 so as to select the reproduced video signal subjected to the level correction by using the corresponding level correction information at the time of normal reproduction, and outputs it to the reproduction D / A converter 9. The reproduction D / A converter 9 performs D / A conversion to obtain a level-corrected reproduction video signal. The method of correcting the level of the reproduced video signal is the same as in the conventional example.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Name of item to be corrected] 0070

[Correction method] Change

[Correction content]

Next, when the normal reproduction is shifted to the FS, the level correction information creation control means 31 operates the selector 35 to input the reference data to the normal reproduction level correction means 32. Change to be input to 33. Hereinafter, the level of the reproduced video signal is corrected in the same manner as in the normal reproduction. The switch 36 outputs the reproduced video signal whose level has been corrected by the FS level correcting means 33 so as to output the level correction information creation control means 31.
Controlled by. Here, the level corresponding to normal playback is
The standard correction data does not change, so the correction information does not change,
Level correction information corresponding to normal reproduction immediately before FS is held. Further, the level correction information corresponding to the RS time is also held in the same manner.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0080

[Correction method] Change

[Correction content]

In the above-described embodiment, the normal reproduction, the FS, and the RS are divided into three areas according to the reproduction speed, level correction information corresponding to each area is created, and the reference data obtained during the normal reproduction corresponds to the normal reproduction. update the level correction information, in a similar manner to update the level correction information corresponding to the time of FS in the reference data at the time of FS, updates the level correction information corresponding to the time of RS with the reference data at the time of RS, each regeneration speed
Although the video signal of the corresponding reproduction speed is level-corrected based on the level correction information corresponding to the frequency, the FS and the RS are divided into two or more regions depending on the difference in the reproduction speed. Similarly, level correction means corresponding to each area may be provided to create level correction information corresponding to each area, and the reproduced video signal may be level-corrected thereby. In addition, the FS and the RS are divided into two or more areas according to the difference in the reproduction speed, as shown in FIG.
1, the level correction information corresponding to each area may be saved, stored and restored when the reproduction speed changes.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Name of item to be corrected] 0083

[Correction method] Change

[Correction content]

FIG. 23 is a block diagram showing the structure of the reproducing system of the characteristic correcting apparatus according to the fourth embodiment of the present invention. In this embodiment, a circuit having the same configuration as that of FIG. 42 (a) is used as a circuit for creating the reference data and inserting it into the recorded video signal. In FIG. 23, the same symbols as those in FIG. 42 (b) are the same or corresponding portions. A reference numeral 50 is used to create level correction information by using reference data obtained from the reproduced video signal during normal reproduction, level-corrects the reproduced video signal based on the level correction information, and performs level correction corresponding to normal reproduction during variable speed reproduction. information and to create a level correction information from the playback speed, the level of the reproduced video signal level-corrected based on the correction information, a level correction means for holding a level correction information corresponding to the time during variable speed reproduction normal playback.

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0091

[Correction method] Change

[Correction content]

Next, the operation will be described. When the reproduction speed identification signal indicates normal reproduction, the level correction information creation control means 55 creates level correction information using the reference data obtained from the reproduced video signal by the level correction means 56, and based on the level correction information. Control is performed so that the reproduced video signal is level-corrected. When the normal reproduction is changed to the variable speed reproduction, the level correction information creation control means 55 saves and stores the level correction information corresponding to the normal reproduction immediately before the variable speed reproduction in the level correction information storage means 57 and the level correction information corresponding to the normal reproduction. Using the reproduction speed, the level correction information creation means 58 for variable speed reproduction creates level correction information corresponding to the reproduction speed and transfers it to the level correction means 56. Speed playback normally shifts to the playback from the level correction information creation control unit 55 to return the level correction information level correction information storage unit 5 in the 7 to the level correcting means 56.
When the reproduction speed changes during the variable speed reproduction period, level correction information corresponding to the normal reproduction immediately before variable speed reproduction and the changed reproduction speed are used to newly generate level correction information corresponding to the reproduction speed. It is created by the means 58 and transferred to the level correction means 56 by the level correction information creation control means 55.

[Procedure Amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0092

[Correction method] Change

[Correction content]

As described above, the level correction is performed based on the reference data obtained during the normal reproduction, and the level correction information is saved and stored at the time of the variable speed reproduction, and the level correction information corresponding to the variable speed reproduction is set to the level correction information and the reproduction speed during the normal reproduction. obtained by calculation using the level correction on the basis of the level correction information, usually from was configured to return the level correction information at the time of reproduction when the transition to normal reproduction from the variable speed reproduction, the embodiment of FIG. 2 5 Has the same effect.

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0094

[Correction method] Change

[Correction content]

Further, in the above-described embodiment, as the level correction method during normal reproduction, the reproduction reference pulse digital data is used as the write address, the corresponding pulse height data is written in the memory, and the output of the reproduction A / D converter 5 is output. An example using the method of reading the corrected value from the memory using the data as the read address has been described. For example, the difference between the data of the reproduction reference pulse and the pulse height data is written in the memory as the correction data to reproduce the reproduction A / D. Converter 5
The correction data is read from the memory by using the output data of No. 2 as an address, and the level correction data is created by software using a method such as adding the output data of the reproducing A / D converter 5 to correct the level. Alternatively, another level correction method such as interpolating the data when a discontinuity occurs in the level correction data may be used.

[Procedure correction 21]

[Document name to be amended] Statement

[Correction target item name] 0097

[Correction method] Change

[Correction content]

Next, the operation will be described. The gate pulse generating means 1 is a gate pulse GP in the same manner as the conventional example.
Is generated (see FIG. 27 (a)). Reference pulse generating means 2
Generates a reference pulse having a quantization level of 0/255 and a reference pulse having a quantization level of 255/255 in succession when the gate pulse GP becomes high, and these two reference pulses are generated. The reference pulse RP is used as a set. The pulse height data generating means 3 are 0/255 and 25.
The pulse height data HD which is the quantized data in the serial format corresponding to the reference pulse RP which is the set of reference pulses having the height of the quantization level of 5/255 is generated. Here, the pulse height data HD is composed of 7 bits.

[Procedure correction 22]

[Document name to be amended] Statement

[Correction target item name] 0099

[Correction method] Change

[Correction content]

When the reference pulse is generated in this way,
The average value of the reference data RD is, for example, two reference pulses R
When the quantization level of P is 0/255 and 255/255, it is (0/255 + 255/255) / 2, and the average value of all the reference data RD is 127.5 / 255, which is almost the gray level of the video signal. Is equal to That is, the value of the reproduction reference pulse changes depending on the quantization level during recording.
Without having to reduction, to vary the characteristics of the video signal
Then, the output of reproducing such reference data RD is reduced in the influence of sag as shown in FIG. At the time of reproduction, level correction is performed using the reference pulse and pulse height data obtained from the reproduced video signal in the same manner as in the conventional example.

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0117

[Correction method] Change

[Correction content]

Further, a further correction effect can be expected by using the means of not using the reproduction correction signal when the dropout occurs in the embodiment of FIGS. 32 to 35.

[Procedure correction 24]

[Document name to be amended] Statement

[Name of item to be corrected] 0135

[Correction method] Change

[Correction content]

Further, in the above embodiment, an example in which the level correction information of one reproduction speed for each of FS and RS is obtained in advance and the level of the reproduced video signal is corrected based on the level correction information has been described. One or more reproduced video signal based on the level-correction information corresponding to the playback speed may be configured to level corrected.

[Procedure correction 25]

[Document name to be amended] Statement

[Correction target item name] 0141

[Correction method] Change

[Correction content]

According to the present invention, level correction information corresponding to at least normal reproduction, FS, and RS is provided, and each level correction information is created using only reference data obtained at the corresponding reproduction speed. Since it is configured to be updated, each level correction information is not updated by the reference data obtained at other reproduction speeds, and is maintained during other reproduction speeds, so that it is suitable for normal reproduction and variable speed reproduction. It is possible to obtain a characteristic correction device capable of performing level correction and instantaneously obtaining a good level-corrected reproduced image even if the reproduction speed changes.

[Procedure Amendment 27]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 38

[Correction method] Change

[Correction content]

FIG. 38

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshifumi Fujii             No. 1 Baba Institute, Nagaokakyo City, Kyoto Prefecture Mitsubishi Electric             Electronic Product Development Laboratory Co., Ltd. (72) Inventor Hideki Kaneko             No. 1 Baba Institute, Nagaokakyo City, Kyoto Prefecture Mitsubishi Electric             Kyoto Works Co., Ltd.

Claims (7)

[Claims] 1. A characteristic correction device for correcting the characteristics of a signal processing system when recording and reproducing a video signal, wherein a plurality of reference pulses corresponding to at least a black level to a white level of the recorded video signal can be generated. A reference pulse generating means, a pulse height data generating means for generating pulse height data for identifying the reference pulse, a predetermined number of reference pulses among the plurality of reference pulses, and the predetermined number of reference pulses. Reference data insertion means for inserting a set of reference data consisting of pulse height data into the blanking period of the recorded video signal, and a reference data insertion means near the minimum and maximum levels of the recorded video signal or near the black level and the white level. A reference signal inserting means for inserting a reference signal having a level into the recorded video signal and a special signal such as when reproduction is started or when variable speed reproduction is changed to normal reproduction. The level correction information is calculated by using the reference signal obtained from the reproduced video signal when newly creating the level correction information for correcting the level correction information, and thereafter the reference pulse obtained from the reproduced video signal and the reference pulse at the time of recording are calculated. Updating the level correction information using pulse height data identifying the value,
A characteristic correction device, comprising: a level correction means for correcting the level of the reproduced video signal. 2. Two sets of n heads (n = 1, 2, 3, ...) Arranged opposite to the rotary drum by 180 degrees are provided, and one field or one frame video signal is n × m (m is In a video signal recording device for recording / reproducing by dividing into (odd number) tracks, a characteristic correcting device for correcting the characteristics of each head and the characteristics of a signal processing system of each head when recording / reproducing a video signal. A reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and a pulse height for generating pulse height data for discriminating the value of the reference pulse. Data generating means, a predetermined number of reference pulses among the plurality of reference pulses, and pulse height data corresponding to the predetermined number of reference pulses form one set of reference data, and each head outputs each of the recorded video signals. Reference data inserting means for inserting the reference data within the blanking period of the recorded video signal, and a reference pulse obtained from the video signal reproduced by each head, so that all the reference data corresponding to the bell can be recorded. Level correction means for correcting the level of the reproduced video signal of each head for each head by using the pulse height data for identifying the value of the reference pulse at the time of recording, and the reference data reproduced by each head to each head. A characteristic correction device, comprising: a correction means switching means for allocating to a corresponding level correction means. 3. A reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and pulse height data for identifying a value of the reference pulse. A set of reference data consisting of a pulse height data generating means, a predetermined number of reference pulses of the plurality of reference pulses, and pulse height data corresponding to the predetermined number of reference pulses is stored in the recorded video signal. Reference data insertion means to be inserted within the blanking period,
Level correction information for level correction is created using a reference pulse obtained from a reproduced video signal and pulse height data for identifying the value of the reference pulse at the time of recording, and the reproduced video is reproduced using the level correction information. A characteristic correction device for correcting characteristics of a signal processing system at the time of recording and reproducing a video signal, which has a level correcting means for correcting the level of a signal, and supports at least normal reproduction, forward search and reverse search. Level correction information is created, each level correction information is created using reference data obtained from a playback video signal at a corresponding playback speed, and the playback video signal is level-corrected using the level correction information corresponding to the playback speed. A characteristic correction device characterized by: 4. A reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and pulse height data for identifying a value of the reference pulse. A set of reference data consisting of a pulse height data generating means, a predetermined number of reference pulses of the plurality of reference pulses, and pulse height data corresponding to the predetermined number of reference pulses is stored in the recorded video signal. Reference data insertion means to be inserted within the blanking period,
Level correction information for level correction is created using a reference pulse obtained from a reproduced video signal and pulse height data for identifying the value of the reference pulse at the time of recording, and the reproduced video is reproduced using the level correction information. In a characteristic correction device for correcting the characteristics of a signal processing system at the time of recording and reproducing a video signal, the characteristic correction device having a level correction means for correcting the level of a signal, wherein reference data obtained from the reproduced video signal is used as a normal reproduction signal. Level correction information is created, the reproduced video signal is level-corrected using the level correction information, and the level correction information corresponding to the normal reproduction during the variable speed reproduction and the level correction information corresponding to the reproduction speed from the current reproduction speed are generated. It is characterized in that it is calculated and obtained, the reproduced video signal is level-corrected based on the level correction information, and the level correction information corresponding to the normal reproduction is held. Characteristic correction device. 5. A characteristic correction device for correcting the characteristics of a signal processing system of a reproduced video signal for recording and reproducing the video signal, wherein a plurality of reference pulses corresponding to at least a black level to a white level of the recorded video signal are generated. Reference pulse generating means, pulse height data generating means for generating pulse height data for identifying the value of the reference pulse, predetermined number of reference pulses and pulse height corresponding to the predetermined number of reference pulses Within the blanking period of the recorded video signal, the predetermined number of reference pulses are selected so that the average value of the predetermined reference pulses is substantially equal to the gray level of the video signal. Reference data inserting means for inserting the reference data into the frame, and level correcting means for level correcting the reproduced video signal using the reference data obtained from the reproduced video signal. Characteristic correction apparatus characterized by comprising. 6. A correction signal creating means for creating a correction signal serving as a reference when correcting the characteristics of a reproduced video signal, a correction signal inserting means for inserting the correction signal into a recording video signal, and a recording video signal. Of a signal processing system for recording and reproducing a video signal having level correction means for correcting the level of the reproduced video signal using a correction signal obtained from the reproduced video signal reproduced from the recording medium in which In the characteristic correction device for correcting the characteristic, the level correction means is allowed to update the level correction information for performing the level correction using the correction signal obtained from the reproduced video signal during the normal reproduction, and during the variable speed reproduction, A characteristic correction apparatus comprising update prohibition means for prohibiting updating of level correction information. 7. A reference pulse generating means capable of generating a plurality of reference pulses corresponding to at least a black level to a white level of a recorded video signal, and pulse height data for discriminating the predetermined number of reference pulses. Within the blanking period of the recorded video signal, a set of reference data consisting of pulse height data generating means and pulse height data corresponding to a predetermined number of reference pulses of the plurality of reference pulses is generated. Information for level correction (hereinafter referred to as level correction information) is created using reference data insertion means to be inserted and reference data obtained from the reproduced video signal, and the reproduced video signal is generated using the level correction information. In a characteristic correction device for correcting characteristics of a signal processing system at the time of recording and reproducing a video signal, which is provided with a level correction means for level-correcting Level correction information is created using the reference data obtained from the image signal, the reproduced video signal is level-corrected using the level correction information, and a level corresponding to the reproduction speed according to each reproduction speed during variable speed reproduction. A characteristic correction apparatus characterized in that correction information is obtained in advance, a reproduced video signal is level-corrected based on the level correction information corresponding to a current reproduction speed, and the level correction information corresponding to a normal reproduction is held.