JPH08149506A - Reproduction signal processing unit for edtv-ii signal - Google Patents

Abstract

PURPOSE: To solve various problems relating to the transmission of an identification control signal between a VTR and an EDTV-II decoder in the case of special reproduction when an EDTV-II signal is recorded/reproduced by the VTR. CONSTITUTION: An identification control signal is stored in a storage circuit 2 in the case of usual reproduction and an output from the storage circuit 2 is replaced with an identification control signal of a high speed reproduction signal by a replacement circuit 3 in the case of special reproduction such as high speed reproduction. Then the identification control signal at the usual reproduction is replaced with the identification control signal at the special reproduction signal to send an identification control signal with a high S/N without time base fluctuation to the EDTV-II decoder and visual disturbance due to mis-discrimination of the identification control signal is not caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a second-generation EDTV (hereinafter referred to as a second-generation EDTV) which is a wide-box television in a letter box format with an aspect ratio of 16: 9, which is compatible with the current NTSC signal standard with an aspect ratio of 4: 3. , EDTV-II) signals to and from a video tape recorder (hereinafter referred to as VTR), and particularly to special reproduction (reproduction other than normal reproduction is hereinafter referred to as special reproduction).

[0002]

2. Description of the Related Art The wide aspect (16: 9) of television broadcasting and its receiver has become a worldwide trend. Against this background, in order to achieve wide aspect ratio and high image quality while maintaining compatibility with the current NTSC system, E
The DTV-II interim scheme proposal was decided.

In this system plan, the letterbox system is premised as a technique for achieving widening while ensuring compatibility with the current NTSC system. It embodies the following major technologies.

1) The 480 scanning lines in the current NTSC system are divided into 120 non-image areas and 360 main image areas,
Wide-letter television in letterbox format.

2) The luminance vertical resolution (still image) is improved by frequency multiplexing in the non-image portion by shifting the vertical high frequency component (VH signal) to the low frequency range.

3) Symmetric short kernel filter (SSKF
(Symmetric Short Kernel Filter)) is used to improve the luminance vertical resolution (moving image) using frequency multiplexing in the non-image area hole of the vertical temporal high frequency component (VT signal).

4) Reinforcement signal (VT signal, VH) to the non-image area
By the signal) multiplexed, current NTSC4: 3 receiver f _sc modulation to achieve the interference reduction in, limiter processing by the nonlinear companding, the like adaptive setup lowered.

5) The signal-to-noise ratio by boosting the small amplitude signal of the vertical reinforcement signal by the nonlinear companding in 4) (hereinafter,
It is called S / N).

6) The luminance horizontal resolution is improved by frequency multiplexing in the main picture area hole by shifting the horizontal high frequency component (HH signal) to the low horizontal frequency range.

7) NRZ, fsc modulated wave, 2.04 as identification control signal for discriminating NTSC system / EDTV-II system
The upper edge of the screen (22H, 285
H) (hereinafter, the scanning line number is shown as H).

The waveform of the identification control signal used in EDTV-II is shown in FIG. B1 to B5 and B24 are signals of NRZ waveforms indicating reference timing, letterbox, etc., and B6 to B23 are signals of color subcarrier suppression amplitude modulation waves indicating presence / absence of multiplexing of VH signal, VT signal, HH signal, etc. is there. B25 to B27 are EDTV-II confirmation signals of 2.04 MHz.

ED scheduled to start broadcasting in 1995
The TV-II signal is received at each home and is viewed at each home by a receiver incorporating an EDTV-II decoder, which is expected to be released in the future. On the other hand, the VT of this EDTV-II signal
Regarding recording / reproduction in R, there is currently no home-use VTR that completely supports recording / reproduction of EDTV-II video signals. Therefore, as a method of recording the EDTV-II video signal, the current VHS system or S-VHS (registered trademark) is used.
Recording and reproduction with a home VTR such as a system can be considered.

When recording / reproducing an EDTV-II signal with a current home VTR, the above-mentioned identification control signals 22H and 285H indicating the EDTV-II signal undergo the same processing as a normal video signal, but this poses a problem. Is for special playback. For the conventional technology, refer to “Home Video Technology” by Katsuya Yokoyama edited by the Japan Broadcasting Corporation and refer to the current V
The high speed reproduction of the special reproduction of TR is shown, and the problem that occurs during the high speed reproduction of the EDTV-II signal will be described.

High-speed reproduction in the current VTR will be described with reference to FIG. FIG. 3A shows a recording track pattern and a head locus during high-speed rewinding reproduction at 5 × speed.
FIG. 3B shows an output signal from the tape at the time of high-speed rewinding reproduction at 5 times speed. In FIG. 3A, at the time of recording, the video signal of one field is FM-modulated and then recorded on one recording track, and at the time of normal reproduction, the reproducing head traces this recording track one by one, and then on the tape. Play all signals in.

During special reproduction, the tape feed is faster than in normal reproduction, and the reproducing head traces on the head locus during high speed reproduction shown in FIG. 3 (A). As a result, the output signal of the reproducing head becomes as shown in FIG. 3B, the S / N of the video signal after FM demodulation is high in the portion where the reproduction signal level is high, and the S / N of the video signal after FM demodulation is low in the portion where the reproduction signal level is small. Further, during special reproduction, due to its nature, the reproduced video signal contains a large time-axis fluctuation component. Then, the identification control signal 22H or 2 is generated in the portion where the S / N is low and the time-axis fluctuation component exists.
When 85H is included, the waveform of the identification control signal is not sufficiently reproduced in the recording / reproducing process, and the identification control signal deteriorates.

[0016]

However, the above-mentioned VH
When the EDTV-II signal is recorded / reproduced by the S method or the SVHS method, the EDTV-II signal is insufficient in waveform reproducibility of the identification control signal during special reproduction as described above.
Misjudgment of the identification control signal command in the decoder occurs.

The problems caused by insufficient waveform reproducibility during special reproduction in the current VTR are listed below. A) During special reproduction, the reproduced identification control signal contains a large time-axis fluctuation component, whereby the phase information of the reproduced identification control signal is lost, and carrier suppression and amplitude modulated B6 to B23.
It is difficult to demodulate commands and determine the commands. B) During special reproduction, the S / N of the reproduced identification control signal is low, which makes it difficult to determine the command of the reproduced identification control signal. C) During special reproduction, a track jump occurs on the tape pattern, so that the relative positional relationship between the vertical synchronizing signal and the horizontal synchronizing signal is not stable. Therefore, the identification control signal reproduced and output by the VTR is set to 1 on the EDTV-II decoder side.
It is detected as a scanning line before and after about two horizontal synchronization periods, and an erroneous determination of the identification control signal command occurs. D) The reinforcing signals of the VH signal and the VT signal multiplexed in the non-picture part should not interfere with the current NTSC receiver f
_Although it is _sc- modulated, during special reproduction, the reproduced identification control signal contains a large time-axis fluctuation component, and f- _sc- modulated V
The H signal and the VT signal are not demodulated accurately. If E
When it is decoded as a DTV-II signal, it is added to the main picture portion, so that visual disturbance occurs in the main picture portion. E) NTSC video (aspect ratio 4: 3) and ED
If the video of the TV-II system (aspect ratio 16: 9) is recorded on the tape so that it frequently switches,
When this tape is played back at high speed, the images of these two systems are frequently switched and played back, and switching between 16: 9 and 4: 3 is frequently performed on the receiver, which makes the image very difficult to see.

The problem of D) will be described in detail below with reference to FIG.

The VTR has an aspect ratio holding period in consideration of the fact that during the special reproduction, the aspect ratio is frequently changed on the receiver and the image becomes very hard to see. The aspect holding period is a time secured when changing the aspect ratio of the video signal in the reproduction signal between 4: 3 and 16: 9 during special reproduction.

As an example of the aspect ratio information holding period,
As shown in FIG. 4A, an EDT having an aspect ratio of 16: 9
Between video signals of V-II system, N of aspect ratio 4: 3
Consider a case where a TSC video signal is recorded for 30 seconds and the aspect ratio holding period is 1 second. At this time, as shown in FIG. 4B, when high speed reproduction of 40 times speed is performed, the EDTV-II having an aspect ratio of 16: 9 in the reproduced signal.
NTSC with aspect ratio of 4: 3 between system video signals
The system video signal is reproduced for 0.75 seconds. Since 0.75 seconds is shorter than the aspect holding period, the aspect ratio information of the identification control signal of the VTR output signal is not changed. For this reason, in the image on the receiver, as shown in FIG. 4C, the EDTV-II system image signal having the aspect ratio of 16: 9 is continuous, and the image is very easy to see. On the other hand, when high-speed reproduction with a reproduction speed of 20 times is performed in the same aspect holding period as above, the aspect ratio is 4: 3 as shown in FIG.
The NTSC system video signal of is reproduced for 1.5 seconds, and since this is for the aspect ratio holding period or more, the aspect ratio information of the identification control signal of the VTR output signal is changed, and the image on the receiver is ), An EDTV-II video signal with an aspect ratio of 16: 9, an NTSC video signal with an aspect ratio of 16: 9, and an N: 4: 3 signal.
The aspect ratio of the TSC system video signal, the 4: 3 EDTV-II video signal, and the 16: 9 EDTV-II system video signal is frequently changed, and the image becomes very hard to see.

The present invention solves the above problems A to E in recording / reproducing EDTV-II signals. In the VTR, even during recording / reproducing of EDTV-II signals, especially during special reproduction such as high-speed reproduction, VTR that does not cause visual interference
The purpose is to provide.

[0022]

In order to achieve this object, the VTR of the present invention has the following configurations A to F. A) A high-definition signal is multiplexed in order to realize a high-definition television image with a wide aspect while maintaining compatibility with a television signal with an aspect ratio of 4: 3, and aspect ratio information and supplementary signal additional information, etc. Is a device for reproducing an EDTV-II signal multiplexed as an identification control signal, and a storage circuit for storing the identification control signal included in the EDTV-II reproduction signal during normal reproduction, and an output signal of the storage circuit for an input signal. And a storage circuit for storing the identification control signal in the storage circuit, and replacing the output of the storage circuit with the identification control signal reproduced at the time of reproduction having a different reproduction speed from the normal reproduction. And a control circuit for controlling the replacement circuit. B) In A), an error correction code decoding circuit is provided, and at the time of normal reproduction, the error correction code decoding circuit decodes the error correction code included in the identification control signal of the reproduction signal to select the signal to be stored in the storage circuit. A control circuit for controlling the selection circuit to be performed is provided by using the decoding result. C) In A), in the case of a reproduction state in which the reproduction speed is different from the normal reproduction, the position of the identification control signal in the reproduction signal and the video signal at a position close to the position of the identification control signal are stored in the storage circuit and the total of n fields per field. A control circuit is provided to control the replacement circuit so as to perform replacement (n ≧ 2) times. D) In A), a replacement circuit for replacing the reproduced signal with the output signal of the storage circuit or the fixed level signal,
EDTV-II / N for judging V-II signal and NTSC signal
The TSC discriminating circuit is provided, and the substituting circuit is controlled to substitute a predetermined part of the output discriminating control signal at a fixed level when the disc is discriminated as an EDTV-II signal in the reproducing state in which the reproducing speed is different from the normal reproducing. And a control circuit for controlling. E) In D), an envelope detection circuit for detecting a reproduction signal level from the recording medium is provided, the determination circuit determines the EDTV-II signal, and the reproduction state in which the reproduction speed is different from the normal reproduction, and the envelope detection circuit In the case where the reproduction signal level is determined to be equal to or lower than a predetermined value, a control circuit for controlling the video signal of the non-picture part to be replaced with a fixed level signal is provided. In this case, the operation state of the replacement circuit is 4: 3 with the aspect ratio of 16: 9.
The time secured when switching between the states is defined as the aspect ratio holding period, and N1> N2 between the aspect ratio holding period T1 for N1 double speed high speed playback and the aspect ratio holding period T2 for N2 double speed high speed playback. A control circuit for controlling the replacement circuit is provided so as to have a relationship of T1 <T2 at the time.

[0023]

This structure has the following great advantages. A) At the time of special reproduction, even if the waveform reproducibility of the reproduction identification control signal is insufficient, the already reproduced identification control signal is output from the memory circuit and replaced with the identification control signal of the special reproduction signal and output. The identification control signal VTR → ED
It ensures the transmission between the TV-II decoder and enables the command identification. B) When the command of the reproduced identification control signal at the time of special reproduction includes an error, the identification control signal including the erroneous command is not stored in the storage circuit described above, and the identification control signal command It is possible to reduce the error rate. C) By inserting a plurality of identification control signals into the reproduction signal when the relative position of the horizontal synchronization signal with respect to the vertical synchronization signal is not stable in the output during special reproduction of the VTR,
The EDTV-II decoder enables reliable detection of the identification control signal. D) At the time of special playback, by deleting the signal of the identification signal indicating the addition of the enhancement signal component and the addition of the enhancement signal which are not necessary for the video of the special playback, the visual interference of the main picture portion caused by the decoding of the enhancement signal is prevented. Allows removal. E) NTSC video (aspect ratio 4: 3) and ED
If an image of the TV-II system (aspect ratio 16: 9) is frequently switched on the tape, even if the tape is played back at high speed, the images of the two systems are frequently switched. This reduces the number of occurrences and makes the image very easy to see.

[0024]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing the circuit configuration of this embodiment. In FIG. 1, reference numeral 1 is an input terminal for a reproduction signal,
2 is a storage circuit for storing the identification control signal of the reproduction signal, 3 is a replacement circuit for replacing a part of the reproduction signal with the output identification control signal of the storage circuit by switching the switch to a and b, 4
Is an output terminal of this embodiment, and 5 is a control circuit of this embodiment.

The operation of the reproduction signal processing apparatus for the EDTV-II signal configured as described above will be described with reference to FIG. (Hereafter, in the timing chart shown in the figure,
The active state is H. FIG. 5 shows signals output by the control circuit 5 for controlling the memory circuit 2 and the replacement circuit 3. During normal reproduction, a stable reproduction identification control signal with a high S / N on the time axis, which is input from the input terminal, is stored in the storage circuit 2 during the period of WE in FIG. At the time of special reproduction, the identification control signal stored in the storage circuit 2 is output during the RE period of FIG. The replacement circuit 3 switches between a and b at the timing shown in FIG. 5C, replaces the identification control signal of the special reproduction video signal with the identification control signal stored in the storage circuit 2, and outputs from the output terminal 4. Output.

By controlling the apparatus by the control circuit 5 as described above, the identification control signal portion of the special reproduction video signal is replaced, and the identification control signal having a low S / N including the time base fluctuation during the special reproduction is provided. Can be a stable discrimination control signal with a high S / N on the time axis.

As is clear from this result, the EDTV-II signal reproduction signal processing apparatus according to this embodiment has an excellent effect that it can output a stable identification control signal with a high S / N on the time axis during special reproduction. Is obtained.

As described above, according to the present embodiment, in order to realize a high-definition television image while widening the aspect while maintaining compatibility with a television signal having an aspect ratio of 4: 3, the reinforcement signal is not displayed at the top and bottom of the screen. A device for reproducing an EDTV-II signal which is multiplexed in an image section and in which aspect ratio information and additional information of a reinforcement signal are multiplexed as an identification control signal, and is included in the EDTV-II reproduced signal during normal reproduction. Memory circuit for storing identification control signal and EDT during special playback
The storage circuit includes a replacement circuit for replacing the V-II reproduction signal with the output signal of the storage circuit, and a control circuit for controlling the storage circuit and the replacement circuit, and the identification control signal reproduced during special reproduction is stored in the storage circuit. With the reproduction signal processing device for the EDTV-II signal, which is replaced with the output of the above, it is possible to output a stable S / N discrimination control signal on the time axis during special reproduction.

In the first embodiment, the case where the special reproduction continues immediately after the normal reproduction is shown. For example, when the special reproduction is performed immediately after the power of the VTR is turned on, the identification control signal storage circuit This object can be achieved even when the normal reproduction state is forcibly set for a short time in order to obtain the identification control signal data, which is beyond the scope of the present invention.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIGS. 6 and 7.

FIG. 6 is a block diagram showing the circuit configuration of this embodiment. In FIG. 6, 6 is an input terminal for the reproduction signal,
7 is a selection circuit for selecting an appropriate identification control signal from the identification control signal of the reproduction signal, 8 is a memory circuit for storing the identification control signal of the reproduction signal, and 9 is identification control of the reproduction signal by switching the switch between a and b. A replacement circuit for replacing the signal with the identification control signal output from the storage circuit, 10 is the output terminal of this embodiment, 1
Reference numeral 1 is an error correction code decoding circuit for decoding the error correction code included in the identification control signal of the reproduction signal, and 12 is a control circuit of this embodiment.

Regarding the reproduction signal processing apparatus for the EDTV-II signal configured as described above, the present embodiment will be described by using FIG. 7 to explain the difference between the output signals of the control circuit in the present embodiment and the first embodiment. An example will be described. FIG. 7A shows the storage timing of the storage circuit during normal reproduction in the first embodiment. In this embodiment, the error correction code included in the identification control signal is decoded during normal reproduction. As an example of this decoding result, the result shown in the error correction code output of FIG. 7 is obtained. Here, when the decoding result is correct, it is indicated by ◯, and when it is incorrect, by x. Then, the control circuit 12 controls the selection circuit and the memory WE of the memory circuit so as to store in the memory circuit only when the decoding result is O, as shown in FIGS. 7C and 7D. And
During special reproduction, the replacement circuit is controlled as in the first embodiment, and the result is output from the output terminal 10.

As described above, the identification control signal is stored in the storage circuit only when the identification control signal is correct according to the result of the error correction code decoding circuit. When the identification control signal contains an error, the identification control signal is stored in the storage circuit. Stop remembering.

As is clear from this result, the reproduction signal processing apparatus for the EDTV-II signal according to this embodiment discriminates a stable S / N on the time axis during special reproduction without error in the command. An excellent effect is obtained in that the control signal is output.

As described above, according to this embodiment, the first embodiment
The reproduction signal processing device described above is used for EDTV-II during normal reproduction.
A selection circuit for selecting a signal to be stored in the storage circuit from the identification control signal included in the reproduction signal, and an error correction code decoding circuit for decoding the error correction code of the identification control signal in the reproduction signal during normal reproduction are added, The control circuit for controlling the storage of the selection circuit and the storage circuit using the decoding result of the error correction code decoding circuit is provided, and the identification control signal stored in the storage circuit is the decoding result of the error correction code in the identification control signal. According to the reproduction signal processing device for the EDTV-II signal, which is selected according to
It is possible to output a discrimination control signal having a high S / N and containing no error in the command.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to FIGS. 1 and 8.

FIG. 1 is a block diagram showing the circuit configuration of this embodiment. In FIG. 1, reference numeral 1 is an input terminal for a reproduction signal,
2 is a storage circuit for storing the identification control signal of the reproduction signal, 3 is a replacement circuit for replacing a part of the reproduction signal with the output identification control signal of the storage circuit by switching the switch to a and b, 4
Is an output terminal of this embodiment, and 5 is a control circuit of this embodiment.

The operation of the reproduction signal processing apparatus for the EDTV-II signal configured as described above will be described with reference to FIG. The basic operation of the configuration of FIG. 1 has been described in the first embodiment. The memory timing of the memory circuit and the operation of the replacement circuit at this time are shown again in FIGS. 8A and 8B. In this way, in the first embodiment, the control circuit 5
The storage circuit 2 and the replacement circuit 3 are controlled by the above, and the identification control signal during special reproduction is replaced by the output signal of the storage circuit 2.

At the time of normal reproduction, the operation of this embodiment is similar to that of the first embodiment. At the time of special reproduction, in the present embodiment, as compared with the first embodiment, the read timing RE of the memory circuit 2 and the switching timing of the replacement circuit 3 of FIG. 8D are different as shown in FIG. 8C. Unlike the first embodiment during special playback,
The identification control signal stored in the memory circuit 2 is output during the RE period (21H, 22H, 23H) in FIG. 8C. Then, in the replacement circuit 3, switching between a and b is performed at the timing as shown in FIG. 8D, and the identification control signal of the special reproduction video signal is used as the identification control signal of the output of the storage circuit 2 during the period from 21H to 23H. It replaces and outputs from the output terminal 4.

In this way, the control signal is generated from the control circuit 5 to control the present reproduction signal processing apparatus, and the signals for the total of three lines, that is, the scanning line of the identification control signal of the special reproduction video signal and the scanning lines before and after it are generated. By making the identification control signal by substituting, the identification control signal with low S / N including the time axis fluctuation at the time of special reproduction is made into the identification control signal with high S / N stable on the time axis, and further in one field. Identification control signal position is not stable even during special reproduction, the identification control signal EDT
The transmission to the V-II decoder is ensured.

As is apparent from this result, the EDTV-II signal reproduction signal processing apparatus according to the present embodiment provides the EDTV-II decoder with the identification control signal at the time of special reproduction even when the position in the field is not stable. It is possible to obtain an excellent effect that it is possible to surely perform transmission of.

As described above, according to this embodiment, at the time of special reproduction, the position of the identification control signal in the reproduction signal and the video signal at a position close to the position of the identification control signal are stored in the storage circuit, and the total of n fields per field. By the reproduction signal processing device of the EDTV-II signal according to the first embodiment, which includes a control circuit for controlling the replacement circuit so as to perform replacement (n ≧ 2) times, a discrimination control signal having a high S / N on the time axis is stable. In addition, the EDTV of the identification control signal can be obtained even in the special reproduction in which the position of the identification control signal in one field is not stable.
-The transmission to the II decoder can be ensured.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to FIGS. 9 and 10.

FIG. 9 is a block diagram showing the circuit configuration of this embodiment. In FIG. 9, 13 is a reproduction signal input terminal, 15 is a memory circuit for storing the reproduction signal identification control signal, 16 is a fixed level generation circuit for generating a signal of 0IRE level, and 17 is a switch to a, b, c. A replacement circuit for replacing a part of the reproduction signal with the output identification control signal of the storage circuit or the signal of 0IRE level by switching
Reference numeral 18 is an EDTV-II / NTSC discriminating circuit for discriminating a letterbox EDTV-II signal and an NTSC signal from a reproduced signal, 19 is a control circuit of this embodiment, and 20 is an output terminal of this embodiment.

The operation of the EDTV-II signal reproduction signal processing apparatus configured as described above will be described with reference to FIG. At the time of normal reproduction, the identification control signal in the reproduction signal is stored in the storage circuit 15 as in the first embodiment.

During special playback and EDTV-II / NTSC
When the determination circuit 18 determines that the signal is an EDTV-II signal, the switches of the replacement circuit 17 are shown in FIGS.
It operates as shown in (D). That is, in the period other than the discrimination control signal period (22H and 285H), the reproduction signal of the switch c is selected, and the discrimination control signal period (22H and 285H) is selected.
In H), the first half of the identification control signal (B1 to B5)
Then, the switch a which is the output of the memory circuit 15 is selected, and the switch b is selected in the latter half (B6 and later) of the identification control signal.

As described above, the control circuit 19 controls the present apparatus, so that the output signal shown in FIG. And this output signal is E
It is transmitted to the DTV-II signal decoder. EDTV-II
The signal decoder recognizes only a signal having an aspect ratio of 16: 9 by the commands B1 to B5 of the identification control signal, and displays it on the receiver as a signal having an aspect ratio of 16: 9 without a reinforcement signal.

As is clear from this result, the EDTV-II signal reproduction signal processing apparatus according to this embodiment transmits only the identification control signals B1 to B5 to the EDTV-II decoder during special reproduction. An excellent effect is obtained in that only the 16: 9 information is transmitted, and during the special reproduction, the decoding of the reinforcement signal, which is apt to cause interference by decoding, is stopped, and a very easy-to-see image without interference is obtained. .

As described above, according to this embodiment, the first embodiment
In the reproduction signal processing device described above, it is a replacement circuit for replacing a predetermined portion of the reproduction signal with the output signal of the storage circuit or a fixed level signal during special reproduction.
-EDTV-II / NT for judging II signal and NTSC signal
An embodiment comprising a SC discriminating circuit and a control circuit for controlling the replacing circuit so as to replace a predetermined portion of the output discriminating control signal with a fixed level during special reproduction and when the discriminating circuit discriminates an EDTV-II signal. In the special reproduction, the reproduction signal processing device for the EDTV-II signal described in 1 transmits only the identification control signals B1 to B5 to the EDTV-II decoder to transmit only the information having the aspect ratio of 16: 9. , The decoding of the reinforcement signal, which is apt to cause interference by decoding, is stopped, and a very easy-to-see image without interference can be obtained.

(Embodiment 5) A fifth embodiment of the present invention will be described below with reference to FIGS. 11 and 12.

FIG. 11 is a block diagram showing the circuit configuration of this embodiment. In FIG. 11, 21 is a reproduction signal input terminal, 23 is a storage circuit for storing a reproduction signal identification control signal, 24 is a fixed level generation circuit for generating a 0 IRE level signal, and 25 is reproduction reproduced from a recording medium. An envelope detection circuit for detecting the signal level, and an ED for discriminating the EDTV-II signal and the NTSC signal from the reproduced signal.
A TV-II / NTSC discriminating circuit, 27 is a control circuit of this embodiment, and 28 is a switch between a, b and c.
A substitution circuit for substituting a part of the reproduction signal by the output identification control signal of the storage circuit or the signal of the level of 0IRE, and 29 is an output terminal of this embodiment.

The operation of the reproduction signal processing apparatus for the EDTV-II signal configured as described above will be described with reference to FIG. At the time of normal reproduction, the identification control signal in the reproduction signal is stored in the storage circuit 23 as in the first embodiment.

During special playback and EDTV-II / NTSC
When it is determined that the signal is the EDTV-II signal by the determination circuit 26, the switches of the substitution circuit 28 are shown in FIGS.
It operates as shown in (E). That is, in the discrimination control signal period (22H and 285H), the output discrimination control of the memory circuit of the switch a is selected. In the non-image area, when the output of the envelope detection circuit, which is the result of judging the level of the reproduction output of the recording medium, is H, that is, when the level of the reproduction output is sufficiently high (when the signal S / N is high), the input terminal When the envelope detection circuit is at L, the switch c which is the output signal of the fixed level generation circuit 24 for generating the fixed level signal of 0IRE is selected. Even when the 0IRE signal is decoded as a reinforcement signal in the non-image part,
As a result of decoding, the VT and VH components are 0. In the main image section, the reproduction signal c input to the input terminal is selected and output from the output terminal 29.

As is clear from this result, the reproduction signal processing apparatus for the EDTV-II signal according to the present embodiment has a low reproduction level of the reinforcement signal of the non-picture part of the EDTV-II signal (S of the signal) during special reproduction. (When / N is low), the reinforcement signal is replaced with a signal of 0IRE level and transmitted to the EDTV-II decoder, so that interference due to decoding of the reinforcement signal with a low S / N that is likely to cause interference does not occur. , It has an excellent effect in that it is possible to obtain an image that is very easy to see and has no interference.

As described above, according to this embodiment, the fourth embodiment
An envelope detection circuit for detecting a reproduction signal level from a recording medium at the time of special reproduction is added to the reproduction signal processing device described, and the EDTV-II / NTSC discrimination circuit at the time of special reproduction discriminates from the EDTV-II signal and detects the envelope. A control circuit that controls the replacement circuit to replace the video signal corresponding to the signal missing portion of the non-image area with the fixed level signal when the circuit detects the signal missing portion where the reproduction signal level is equal to or lower than the predetermined value. The EDTV-II signal reproduction signal processing device provided makes it possible to obtain a very easy-to-see image without causing interference due to decoding of a reinforcement signal having a low S / N which is likely to cause interference.

(Embodiment 6) A sixth embodiment of the present invention will be described below with reference to FIGS.

The control method of the control circuit 19 of FIG. 9 shown in the fourth embodiment is different in this embodiment. FIG. 9 is a block diagram showing the circuit configuration of this embodiment. In FIG. 9, 13 is a reproduction signal input terminal, 15 is a memory circuit for storing the reproduction signal identification control signal, 16 is a fixed level generation circuit for generating a signal of 0IRE level, and 17 is a switch to a, b, c. Switching circuit for replacing a part of the reproduced signal with the output identification control signal of the memory circuit or the signal of 0IRE level, and 18 is a letterbox type E from the reproduced signal.
EDTV-II for discriminating between DTV-II signal and NTSC signal
/ NTSC discrimination circuit, 19 is the control circuit of this embodiment, 20
Is the output terminal of this embodiment.

The operation of the EDTV-II signal reproduction signal processing apparatus configured as described above will be described with reference to FIG. The time secured when switching the operating state of the replacement circuit between the state of 16: 9 and the state of 4: 3 during special reproduction is defined as the aspect ratio holding period.
As an example of the aspect ratio information holding period configured as described above, the aspect ratio 16:
Consider a case where an NTSC video signal having an aspect ratio of 4: 3 is recorded for 30 seconds between 9 EDTV-II video signals and the aspect ratio holding period is 1 second. At this time, as shown in FIG. 4 (B), when high-speed reproduction of 40 times speed is performed, the ED having an aspect ratio of 16: 9 in the reproduction signal.
NT with aspect ratio of 4: 3 between TV-II video signals
The SC video signal is reproduced for 0.75 seconds. Since 0.75 seconds is shorter than the aspect holding period, the aspect ratio information of the identification control signal of the VTR output signal is not changed. Therefore, in the image on the receiver, the EDTV-II image signal having the aspect ratio of 16: 9 is continuous as shown in FIG.
The image is very easy to see. On the other hand, when high-speed reproduction with a reproduction speed of 20 times is performed in the same aspect holding period as above, an NTSC video signal with an aspect ratio of 4: 3 is displayed for 1.5 seconds as shown in FIG. Since it is reproduced and is longer than the aspect ratio holding period, the aspect ratio information of the identification control signal of the VTR output signal is changed, and the aspect ratio of the image on the receiver is 16: 16 as shown in FIG. 9 EDTV-II video signal, aspect ratio 16: 9 NTSC video signal, 4: 3 NTSC video signal, 4: 3 EDTV-II video signal, 16:
The 9EDTV-II video signal and the aspect ratio change frequently, resulting in an image that is very difficult to see.

Therefore, the storage circuit 15 and the replacement circuit 17 in FIG. 9 are controlled so that the aspect ratio holding period for high speed reproduction at 40 times speed is 1 second and the aspect ratio holding period for high speed reproduction at 20 times speed is 2 seconds. As shown in FIG. 4F, EDTV-II video signals having an aspect ratio of 16: 9 are continuous,
The image is very easy to see.

As is clear from this result, the reproduction signal processing apparatus for the EDTV-II signal according to the present embodiment has an NTSC video signal with an aspect ratio of 4: 3 and an EDTV-with an aspect ratio of 16: 9.
An excellent effect is obtained in that the aspect ratio does not change frequently even when a tape recorded so that the II video signal is switched frequently is played back at high speed.

As described above, according to this embodiment, the time secured when switching the operation state of the replacement circuit between the state of 16: 9 and the state of 4: 3 during the special reproduction is the aspect ratio. The holding period is T1 when N1> N2 between the aspect ratio holding period T1 for high-speed playback at N1 double speed and the aspect ratio holding period T2 for high-speed playback at N2 double speed.
The EDTV-II signal reproduction signal processing apparatus according to the fourth embodiment, which includes the control circuit that controls the replacement circuit so as to satisfy the relationship of <T2, can provide a very easy-to-see image in which the aspect ratio does not change frequently.

In the first to sixth embodiments, no mention is made of whether analog signal processing or digital signal processing is performed. However, both analog and digital processing can achieve the object of the present invention. Does not leave.

[0064]

As described above, the present invention has the following configuration. (A) In order to realize a wide-spectrum and high-definition television image while maintaining compatibility with a television signal having an aspect ratio of 4: 3, reinforcing signals are multiplexed in the non-image parts at the top and bottom of the screen, and the aspect ratio information and A device for reproducing an EDTV-II signal in which additional information of a reinforcement signal or the like is multiplexed as an identification control signal, and a storage circuit for storing the identification control signal included in the EDTV-II reproduction signal during normal reproduction, and a special circuit. A replacement circuit for replacing the EDTV-II reproduction signal with the output signal of the storage circuit at the time of reproduction, and a control circuit for controlling the storage circuit and the replacement circuit are provided, and the identification control signal reproduced at the time of special reproduction is described above. The output of the memory circuit is replaced to form an output signal. (B) In the reproduction signal processing device described in (a), a selection circuit that selects a signal to be stored in the storage circuit from the identification control signal included in the EDTV-II reproduction signal during normal reproduction, and a reproduction circuit An error correction code decoding circuit for decoding an error correction code of an identification control signal is added, and the control circuit controls the storage of the selection circuit and the storage circuit using the decoding result of the error correction code decoding circuit. The identification control signal stored in the memory circuit is selected according to the decoding result of the error correction code in the identification control signal. (C) At the time of special reproduction, the position of the identification control signal in the reproduction signal and the video signal at a position close to the position of the identification control signal are stored in the storage circuit, and the total number of times per field is n (n ≧ 2).
A configuration similar to that of (a) is adopted while including a control circuit that controls the substitution circuit to perform substitution. (D) In the reproduction signal processing device described in (a), it is a replacement circuit for replacing a predetermined portion of the reproduction signal with the output signal of the storage circuit or the fixed level signal during special reproduction, and the EDTV-II signal and the NTSC signal during normal reproduction. EDT to judge
A control circuit which comprises a V-II / NTSC discriminating circuit and controls the permuting circuit so as to substitute a predetermined part of the output discriminating control signal at a fixed level during special reproduction and when the discriminating circuit discriminates the EDTV-II signal. It has the same configuration as that of (a). (E) An envelope detection circuit for detecting a reproduction signal level from a recording medium at the time of special reproduction is added to the reproduction signal processing device described in (d), and the EDTV-II / N is used at the time of special reproduction.
When the TSC discriminating circuit discriminates the EDTV-II signal and the envelope detecting circuit detects the reproduced signal level as a signal missing portion of a predetermined value or less, the video signal corresponding to the signal missing portion of the non-image area is fixed level. It is configured to include a control circuit that controls the replacement circuit so as to replace the signal. (F) During special playback, the time secured when switching the operating state of the replacement circuit between the state of 16: 9 aspect ratio and the state of 4: 3 aspect ratio is the aspect ratio holding period, and high-speed playback at N1 double speed is performed. N1> N between the aspect ratio holding period T1 and the N2 double speed high-speed playback aspect ratio holding period T2.
In the case of 2, a configuration similar to that of (d) is adopted while including a control circuit for controlling the replacement circuit so as to have a relationship of T1 <T2.

With the above configuration, the problem in recording and reproducing the EDTV-II signal can be solved, and the EDTV can be used in the VTR.
It is possible to realize an excellent reproduction signal processing device for an EDTV-II signal, which can provide a VTR that does not cause visual interference even during recording / reproduction of a -II signal, particularly special reproduction such as high-speed reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a waveform diagram of a discrimination control signal in EDTV-II.

3A is a schematic diagram of a track pattern and a head locus during high-speed reproduction, and FIG. 3B is a schematic diagram of a reproduction output signal during high-speed reproduction.

FIG. 4 is an explanatory diagram of a sixth embodiment of the present invention.

FIG. 5 is a timing diagram of control signals according to the first embodiment of the present invention.

FIG. 6 is a block diagram of a second embodiment of the present invention.

FIG. 7 is a timing diagram of control signals in the second embodiment of the present invention.

FIG. 8 is a timing diagram of control signals in the third embodiment of the present invention.

FIG. 9 is a block diagram of a fourth embodiment of the present invention.

FIG. 10 is a timing chart of the fourth embodiment of the present invention.

FIG. 11 is a block diagram of a fifth embodiment of the present invention.

FIG. 12 is a timing diagram of control signals in the fifth embodiment of the present invention.

[Explanation of symbols]

 1 Input Terminal 2 Storage Circuit 3 Replacement Circuit 4 Output Terminal 5 Control Circuit 6 Input Terminal 7 Selection Circuit 8 Storage Circuit 9 Replacement Circuit 10 Output Terminal 11 Error Correction Code Decoding Circuit 12 Control Circuit 13 Input Terminal 15 Storage Circuit 16 Fixed Level Generation Circuit 17 Replacement Circuit 18 EDTV-II / NTSC Discrimination Circuit 19 Control Circuit 20 Output Terminal 21 Input Terminal 23 Storage Circuit 24 Fixed Level Generation Circuit 25 Level Generation Circuit 26 EDTV-II / NTSC Discrimination Circuit 27 Control Circuit 28 Replacement Circuit 29 Output Terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display part H04N 7/00 A

Claims (6)

[Claims] 1. A widening aspect ratio compatible with a television signal having an aspect ratio of 4: 3, and reinforcement signals are multiplexed in non-image areas above and below the screen in order to realize a high-definition television image, and an aspect ratio. A device for reproducing an EDTV-II signal in which information and additional information of a reinforcement signal are multiplexed as an identification control signal, and a storage circuit for storing the identification control signal contained in the EDTV-II reproduction signal during normal reproduction. An identification control signal reproduced during special reproduction, comprising a replacement circuit for replacing the EDTV-II reproduction signal with the output signal of the storage circuit during special reproduction, and a control circuit for controlling the storage circuit and the replacement circuit. Is replaced with the output of the storage circuit to obtain an output signal, and a reproduction signal processing device for an EDTV-II signal. 2. A reproduction signal processing apparatus according to claim 1, wherein a selection circuit for selecting a signal to be stored in a storage circuit from an identification control signal included in an EDTV-II reproduction signal during normal reproduction,
An error correction code decoding circuit for decoding the error correction code of the identification control signal in the reproduction signal during normal reproduction, and controlling the storage of the selection circuit and the storage circuit using the decoding result of the error correction code decoding circuit. An ED including a control circuit, wherein the identification control signal stored in the storage circuit is selected according to a decoding result of an error correction code in the identification control signal.
TV-II signal reproduction signal processing device. 3. At the time of special reproduction, an identification control signal in which a position of the identification control signal in the reproduction signal and a video signal at a position close to the position of the identification control signal are stored in a storage circuit is n times (n in total) per field.
≧ 2) The reproduction signal processing device for an EDTV-II signal according to claim 1, further comprising a control circuit for controlling the replacement circuit so as to perform replacement. 4. The reproduction signal processing apparatus according to claim 1, wherein the replacement circuit replaces a predetermined portion of the reproduction signal with an output signal of the storage circuit or a fixed level signal during special reproduction, and with the EDTV-II signal during normal reproduction. An EDTV-II / NTSC discriminating circuit for discriminating an NTSC signal is provided, and a replacing circuit is provided for replacing a predetermined portion of the output discriminating control signal with a fixed level during special reproduction and when the discriminating circuit discriminates an EDTV-II signal. The EDTV-II signal reproduction signal processing apparatus according to claim 1, further comprising a control circuit for controlling. 5. The reproduction signal processing apparatus according to claim 4, further comprising an envelope detection circuit for detecting a reproduction signal level from a recording medium during special reproduction, and the EDTV during special reproduction.
-When the II / NTSC discriminating circuit discriminates the EDTV-II signal and the envelope detecting circuit detects the reproduced signal level as a signal missing portion equal to or lower than a predetermined value, a video signal corresponding to the signal missing portion of the non-image area. EDT comprising a control circuit for controlling the replacement circuit to replace the signal with a fixed level signal
Reproduction signal processing device for V-II signal. 6. The aspect ratio holding period is defined as the time secured when switching the operating state of the replacing circuit between the state of 16: 9 and the aspect ratio of 4: 3 during special reproduction.
Aspect ratio holding period T1 for high-speed playback at 1 × speed and N
N during the aspect ratio holding period T2 of double speed high speed reproduction
5. The ED according to claim 4, further comprising a control circuit for controlling the replacement circuit so as to have a relationship of T1 <T2 when 1> N2.
TV-II signal reproduction signal processing device.