JP2002319210A - Recording and reproducing device, and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly and easily obtain reproduced images for every channel during a search reproducing, in which the recorded contents are quickly observed, regardless of intermittent recordings and normal speed recordings, on a time-lapse VTR that is capable of conducting a multi-channel recording. SOLUTION: Recorded video information (channel number) is generated, added and recorded onto one continuous video signal that are generated by successively switching video camera outputs by a video switching means; during a search reproducing, a written interval to an image memory is controlled according to the recorded video information and reproducing head signal levels; then the reading of successive video signals from an image memory means, in which only a specific channel is stored, is controlled by a recording control means. Furthermore, rotation of a magnetic head and a tape running are controlled, so that reproduced signals of the portion of a prescribed position where recorded image video information is added are always obtained in an equal level to or more than a prescribed level. Moreover, control is made, to increase or to decrease the number of recorded video channels according to the number of channels of the input video signals and the search speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-lapse magnetic recording / reproducing apparatus (hereinafter abbreviated as "time-lapse VTR") which is used, for example, for surveillance and crime prevention, and intermittently skips frames of a video signal for recording and reproducing. .

[0002]

2. Description of the Related Art In recent years, in order to simultaneously monitor and record various places in factories, construction sites, stores, and the like, video signals from a plurality of video cameras are sequentially switched and intermittently recorded on a video tape intermittently. For example, a time-lapse VT capable of recording for a long time such as 720 hours on one tape
R is widely used. As a result, when an abnormality occurs, the recorded video signal can be reproduced to obtain valuable information.

For example, Japanese Patent Application Laid-Open No. 62-295581 discloses that the outputs of a plurality of video cameras are sequentially recorded on the same magnetic tape for each field (or frame), and only the desired video camera output is output from the magnetic tape during reproduction. 1
A time-lapse VTR is shown, which can be taken out in units of fields (or frames) and the recorded contents can be checked correctly.

Hereinafter, VH will be described as an example with reference to the drawings.
The configuration of a conventional time-lapse VTR using an S-system video cassette tape will be described.

FIG. 22 shows an example of a configuration of a monitoring system using a conventional time-lapse VTR. In FIG. 22, 1 is a time-lapse VTR, 2 is a switcher, 3
a to 3n are video cameras, and video cameras 3a to 3n
The video signals from (A, B, C to Nch) are sequentially switched by the video switching circuit 4 of the switcher 2 using a field or a frame as a minimum unit. Recorded video information is added to a predetermined position (for example, a part of a vertical blanking period) for each video field, and is supplied to the time lapse VTR1. Although FIG. 22 shows an example in which the switcher 2 is separated into another device, the same applies to a case where the switcher 2 is built in the time lapse VTR 1. In time lapse VTR1,
The chroma signal of the input video signal is converted to a low band by a color low band conversion circuit 7, while the luminance signal is converted to an FM modulation circuit 8.
, The outputs of both circuits 7 and 8 are added, and then the magnetic heads H1 + (12), H2- (13), and H3- (1) mounted on the cylinder 11 via the recording amplifier 10.
4) The video of each channel is sequentially recorded in a diagonal track on the magnetic tape 16 in a pair of H4 + (15) without frames. In this case, an intermittent recording / reproducing mode (for example, tape) in which the tape runs intermittently, in contrast to a normal speed mode (for example, 33.33 mm / sec in the VHS standard mode) in which the tape is continuously run at normal speed. Recording can be performed for a long time with the recording stopped. The magnetic head H
1+ (12), H4 + (15) and magnetic head H2- (13),
H3- (14) have different azimuth angles α and β (normally α = + θ, β = −θ), and are recorded alternately at different azimuth angles, greatly reducing interference from adjacent tracks during reproduction. ing.

At the time of reproduction, the magnetic head H1 + (1
2) The reproduced signals from H2- (13), H3- (14), and H4 + (15) are amplified by the preamplifiers 16, 17, 18, and 19, and then passed through the switch circuits 20, 21, and 22. Chroma signal and luminance signal restored to their original bands by the color high-frequency conversion circuit 23 and the FM demodulation circuit 24, respectively, and further added by the addition circuit 25 to obtain a reproduced video signal. Further, the system controller 27 operates the servo circuit 30 for controlling the cylinder 11, the control head 28, and the capstan motor 29 according to the operation mode input by the mode setting input unit 26 by the user,
The operation state of the time lapse VTR 1 is controlled. In addition, the system control means 27 activates the switching circuit 31 to make one of the outputs of the switch circuits 20 and 21 one of the outputs of the switch circuit 22 in the normal speed or intermittent running reproduction mode, so that the tape runs at a speed higher than the normal speed. In the search reproduction mode, the outputs of the switch circuits 20 and 21 are compared and detected by the level comparison detection circuit 32, and the larger one is used as the output of the switch circuit 22.

The switcher 2 includes an A / D unit 33 for writing and reading a video signal, an image memory 34, and a D / A
Means 35 and a memory control means 36 for controlling these means. First, the video channel number recorded by the recorded video information detecting means 37 is detected from the reproduced video signal from the time lapse VTR 1 and this video channel number is also detected. At this time, only the reproduced image of the desired channel set by the reproduction channel setting means 38 is written to the image memory and further read, so that only the reproduced image of the desired channel is set to T.
It is being reproduced on the V monitor 39.

Here, when intermittently reproducing the tape on which the intermittent recording is performed, as shown in FIG.
23 (e) or (f), a substantially flat and good head reproduction signal can be obtained based on the SW30 signal 40 indicating the period during which the tape 15 is in contact with the tape. When the tape on which the intermittent recording is performed is played back at normal speed and viewed a little earlier, as shown in FIG. 24, the inclination of the recording track and the reproduction trace is different by one track, so that the tape slightly looks like an abacus ball, but it is higher than a required level. A head reproduction signal is obtained. Therefore, the channel number added to the predetermined position can be accurately detected, and the video signal of each channel is reproduced for each track, and each of the A, B, and C selected and set via the switcher 2 is used. To Nch reproduced images can be obtained favorably.

[0009]

However, in the conventional time lapse VTR, in a search / reproduction mode in which a tape in which each channel is sequentially recorded without frames is run at a high speed, the reproduction trace locus of the magnetic head is, for example, as shown in FIG. As shown in the example of 4ch video recording and 5x speed search, the track spans a plurality of tracks. In this case, the outputs of the switch circuits 20 and 21 look like an abacus ball as shown in FIGS. 26 (f) and 26 (g), the higher level is selected by the level detection circuit 32, and the output of the switch circuit 22 is FIG.
(H), and as shown in FIG. 26 (i), during one reproduction field period, the reproduction channels are switched to A, B, C, and Dch in response to the switching of the track. Partially exist. Therefore, when the reproduction signal at the predetermined position to which the channel number is added is near the track switching,
The channel number added to the predetermined position cannot be accurately detected, resulting in an incorrect reproduction channel. Moreover, even if the recording channel number can be accurately detected, a plurality of channels other than the channel whose number is detected partially exist in each reproduction field as shown in FIG. Since the writing and reading to the memory are performed for each field, as shown in FIG. 27, for example, in the field T1, for example, the reproduction signals of B1, C1, D1, and B2 for the detection number Ach are erroneously written to the image memory. As a result, each of A, B, C, and Dch is multiplexed and reproduced, so that a reproduced image of only a predetermined channel cannot be obtained, and there is a problem that it is very difficult to see.

An object of the present invention is to provide a time lapse VTR which can accurately detect a recording channel number even during search reproduction, can obtain a good search reproduction image for each video channel without screen disturbance, and can quickly recognize and confirm recorded contents. To provide.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a video switching means for sequentially switching a plurality of input video signals to generate a continuous video signal; Recording video information generating and adding means for generating a signal indicating recorded video information such as a channel number corresponding to each channel, and adding the recorded video information signal to a predetermined position of the continuous video signal from the video switching means; A magnetic recording / reproducing means for recording / reproducing an output video signal from the recorded video information generating / adding means on an oblique track on a tape by a rotating magnetic head; and a reproducing means for generating a reproduced video signal from an output signal from the magnetic head during reproduction. A video signal generating means for generating a signal indicating a switching point for each track to be reproduced during search reproduction in which the magnetic head traces across a recording track; A reproducing track switching signal generating means for detecting the recorded video information added at the time of recording from the output of the reproduced video signal generating means, an A / D conversion of the reproduced video signal to an image memory Image memory means for writing once, and then D / A conversion and reading, and a writing period to the image memory means for each video channel according to the output from the recorded video information detecting means and the reproduction track switching signal generating means. Period control means for controlling the writing, image writing means for controlling writing to the image memory means, reading control means for controlling reading from the image memory means, and control of rotation of the magnetic head and running operation of the tape. And servo means for performing the operation.

Further, the servo means controls the rotation of the magnetic head and the tape running so that a reproduction signal at the predetermined position to which the recorded video information signal is added can always be obtained at a predetermined level or more during search reproduction. Let it.

Further, there is provided recording channel control means for controlling so as to increase or decrease the number m of video channels recorded by the magnetic recording / reproducing means.

[0014]

Each input video signal is selected by the video switching means using a field or a frame as a minimum unit to become one continuous video signal, and then incorporated into the continuous video signal by the recorded video information adding means. After video information such as the total number m of channels of each video signal and each channel number is added to the continuous video signal, for example, in a vertical blanking period, for each field, it is recorded on a magnetic tape by the magnetic head.

During reproduction, the reproduction signal processing circuit means selectively switches the output from the magnetic head to generate a reproduction head signal, and restores and demodulates the reproduction head signal to an original video signal. On the other hand, recorded video information added at the time of recording is detected from the reproduced video signal by the recorded video information detecting means, and is output to the writing period control means. Further, the writing period control means generates a control signal indicating a writing period to the image memory in accordance with the total number m of channels detected from the recorded video information detecting means and the channel number for each reproduction field. Therefore, the writing control means controls the writing to the predetermined portion of the image memory means in accordance with the writing period control signal, whereby a plurality of channels are continuously reproduced in each reproduction field. A reproduced video signal portion of only a specific desired channel from the video signal is written in the image memory means. Next, by controlling the reading of the video signal sequentially from the image memory means in which only the specific channel is stored by the read control means, a search reproduction image of only the desired specific channel is obtained without multiplex reproduction of each channel. The recorded contents can be searched and confirmed very easily and at high speed.

Further, during the search reproduction, the servo means automatically performs tracking control so that a reproduction signal of the predetermined position portion is always obtained at a predetermined level or more. It is possible to accurately detect the channel number that is present, obtain a normal write period control signal without mistake in the reproduction channel, and always realize a good search reproduction image of only a specific channel.

Further, the servo means controls the tape running speed to k × v (v: normal tape running speed, the sign of k indicates each forward / reverse search) at the time of search reproduction, and at the time of search. Is the prime number P,
As the product of n,

[0018]

[Equation 1] | k | = P1 ^L1 · P2 ^L2 · P3 ^L3 ····· Pn
^{When Ln} (Ln is a natural number), the number q of video channels input to the video switching means is:

[0019]

## EQU2 ## When q = a.Pn (a is a natural number), the recording channel control means sets the number m of recording channels to

[0020]

## EQU3 ## By increasing or decreasing the number of recorded video channels so as to satisfy m ≠ a · Pn (a is a natural number), a search image can be displayed over the entire screen area for each video channel.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 is a block diagram of a time lapse VTR according to a first embodiment of the present invention.

In FIG. 1, reference numerals 40a, 40b to 40n denote input video signal terminals, 41 denotes a sync separation circuit, 42 denotes a switching means for selecting and outputting a reference sync signal, and 43 denotes presence or absence of video input based on the input sync signal. And a recording channel control means 44 for detecting the number of input video channels and controlling the number of video channels to be recorded, 44 generates a recorded video information signal such as a video channel number and the total number of channels, and adds the recorded video information signal to the video output from the video switching circuit 4 Information adding means, 45 is a recording signal conversion circuit for converting a chroma signal of a video signal into a low band and frequency-modulating a luminance signal, 46 is a logic circuit comprising an exclusive NOR gate, and 47 is a circuit for converting a chroma signal to a high band. On the other hand, a reproduction signal conversion circuit for frequency-demodulating the luminance signal and restoring it to the original band, 48 is a reproduced chroma signal. A digitizing fine luminance signal /
D converter, 49 is an image memory, 50 is a D / A converter that converts a video signal into an analog signal, 51 is an encoder circuit that converts a luminance signal and each color difference signal from the D / A converter 50 into a video signal and outputs the video signal. , 52 is a sync separation circuit for separating a sync signal from the reproduced video signal, 53 is a recorded video information detecting means for detecting recorded video information from the reproduced video signal, 54 is a signal from the recorded video information detecting means 53 and the logic circuit 46. A writing period control circuit that generates a control signal indicating a writing period to the image memory 49 according to the output; 55, a writing control circuit that controls writing of a video signal to the image memory 49;
Reference numeral 56 denotes a reference signal generation circuit for generating a reference signal having a stable frequency, and reference numeral 57 denotes a read control circuit for controlling reading of a video signal from the image memory 49. Reference numeral 58 denotes an envelope detection circuit for detecting the envelope level of the reproduced signal,
9 is a recording information period generating means for generating a recording information period signal indicating a predetermined period to which the recording information is added, and 60 is a tracking for generating a tracking control signal for controlling scanning of a magnetic head on a recording track on a magnetic tape. It is a control signal generation means. In FIG. 1, the same reference numerals are given to the same or equivalent parts as those in the conventional example shown in FIG.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIGS.
18 will be described. FIG. 2 shows an example in which an input video signal of four channels is recorded by intermittent tape running, and
It shows each signal timing at the time of reproduction at the double speed (k = 5) search. The video signal from each video camera is selected by the video switching circuit 4 for each field or frame and becomes one continuous video signal. on the other hand,
The synchronization separation circuit 41 separates a synchronization signal of each input video signal. The recording channel control means 43 determines the presence or absence of each input video signal based on the separated synchronization signal,
A reference channel is selected in a predetermined order from the input video channels, and the switching circuit 42 controls so that the synchronization signal of the reference channel is selectively output to the video switching means 4. In addition, the recording channel control means 43 controls the video switching means 4 so as to switch the input video signal by adding the reference synchronizing signal to the input video signal according to the number of input video channels and the search traveling speed, or there is an input. The video switching means 4 is controlled so as to reduce the number of video channels to be recorded for the video channel. In the recording channel control means 43, recorded video information such as a channel number corresponding to the video channel selected by the video switching means 4 or the total number m of selected channels is stored in a predetermined position of the video signal for each field. (For example, as part of the vertical retrace interval)
The recording video information signal generation / addition means 44 is controlled. FIG.
FIG. 4 shows an example of a predetermined position to which recorded video information is added without damaging the original video portion. FIGS. 4 and 5 show a case where a channel number is coded and added to this predetermined position as recorded video information. . Thereafter, the magnetic heads (H1 +, H1) are passed through the recording signal conversion circuit 45 and the recording amplifier 10.
(3- or H2-, H4 +) is recorded on the magnetic tape.

When a track on which video signals of four channels are sequentially recorded is reproduced by a 5 × speed search as shown in FIG. 25, first, a switch is switched in accordance with the SW30 signal shown in FIG. The outputs of the magnetic head are selected by the circuits 20 and 21, and two sets of reproduction head signals (a set of H1 + and H3- and a set of H2- and H2- as shown in FIGS.
4+ pairs) are generated. Next, the higher level of the two sets of reproduction head signals is detected by the level comparison detection circuit 32, and the higher level is always selected from the switch circuit 32 via the switch circuit 31 during search reproduction. A reproduction head signal as shown in FIG. 2D is obtained, and subsequently the reproduction video signal is restored by the reproduction signal conversion circuit 47. Here, the level comparison detection circuit 32
Then, as shown in FIG. 2E, the two envelope waveforms of the two sets of reproduction head signals whose amplitude levels are obtained are compared to generate a level comparison signal V1 as shown in FIG. 2F.
Next, in the logic circuit 46, the level comparison signal and S
From the AND operation with the W30 signal and the AND operation of the inverted signals of these two signals, y shown in FIGS.
2 (g) and 2 (h).
By the R operation, a signal as shown in FIG.
As can be seen from comparison with (d), a signal indicating the switching point of the reproduction track is obtained. In this case, in other words, since the azimuth angles α and β are recorded alternately,
FIG. 2 (i) and FIG. 2 (j), which is an inverted signal thereof, are signals indicating the azimuth angle of the track being reproduced, and the first azimuth signal (High is on the α side) and the second azimuth signal, respectively. (High is on the β side). The recorded video information detecting means 53 detects recorded video information such as a channel number and a total number of channels for each field from the reproduced video signal, and supplies it to the writing period control circuit 54. Even when only the channel numbers are recorded as illustrated in FIGS. 4 and 5, the channel total number can be determined by sequentially detecting the channel numbers at a predetermined position during search reproduction and counting the number of different channel numbers. ,
Alternatively, it is also possible to determine the total number of channels by temporarily setting the normal reproduction state and sequentially detecting channel numbers accurately. 2 (k), (l) and (m) based on the signal indicating the switching of the reproduction track, the total number m of detection determination channels, and the detection channel number for each reproduction field. ), (N)
A control signal indicating the write period of each channel as shown in FIG. That is, according to the total number of detection channels m = 4, each count value when the number of states of High and Low of the first azimuth signal (or the second azimuth signal) is sequentially counted every m = 4 (FIG. 2). (I)
A control signal indicating the writing period of each channel is generated by extracting only the period of (number appended to
The channel number added during the predetermined period shown in (o) is detected and determined, and the reproduction channel can be determined for each field as shown in FIG. , (L), (m),
As shown in (n), a good write period control signal for each channel can be generated. Therefore, the write period control signal of each channel corresponds to each specific channel number appended to FIG. Can be memorized.

At this time, the reference signal generation circuit 56 and the read control circuit 57
As shown in FIG. 6, the screen searched and reproduced on the monitor includes the fields T1 and T1, which are half cycle periods of the SW30 signal.
The reproduction portion of each channel is different for each T2, T3... For example, when viewing Ach, the entire screen can be reproduced in four fields. It goes without saying that the same applies to other channels. If the number of recorded video channels is 2,
It is clear that similar effects can be obtained with 3, 6, and the like.

However, as shown in FIG. 7, when a video signal of five channels is input and recorded and reproduced by a search at a speed of 5.times. Cannot write to memory and cannot play full screen.

On the other hand, during normal speed recording (for example, 33.33 mm / sec in the standard mode of the VHS system) in which the tape is continuously run at the normal speed for recording, the tape runs during the recording trace of the magnetic head. On the other hand, the inclination of the tape recording pattern is such that the inclination occurs by one track with respect to the intermittent recording. Therefore, the reproduction trace locus at the time of the search reproduction also becomes as shown in FIG. 8 at the time of, for example, a 5 × speed search, and is different from that at the time of the intermittent recording shown in FIG. As an example of this case, FIG. 9 shows each signal timing when a 4-channel video signal is input and recorded at a normal speed and reproduced by a 5 × speed (k = 5) search. S
Although the video channel immediately after the W30 signal is different, it operates in the same manner as in FIG. 2 and achieves the same effect as shown in FIG. Also in this case, similarly, at the time of 5-channel recording, the entire screen cannot be reproduced as shown in FIG.

Here, in the first embodiment of FIG. 1, the search reproduction images obtained respectively in the case of different recording running modes such as the total number m of recording channels, the number k of search double speeds, and intermittent or normal speed are collectively shown. , As shown in FIG. From FIG. 12, the tape running speed k at the time of search is defined as the product of the prime numbers Pn.

[0030]

[Equation 1] | k | = P1 ^L1 · P2 ^L2 · P3 ^L3 ····· Pn
^{When Ln} (Ln is a natural number), the number m of video channels input to and recorded by the video switching means is:

[0031]

## EQU2 ## When m 場合 a · Pn (a is a natural number), a good search image can be displayed over the entire screen area of each video channel.

Further, in the present invention, the number m of video channels input to and recorded by the video switching means is:

[0033]

## EQU3 ## When m = aPn (a is a natural number), the recording channel control means 43
With respect to the number q of video channels input to the video switching means, control is performed such that the reference synchronization signal from the switching circuit 42 is added to the input video signal and the video switching means 4 sequentially switches and outputs the signals. Or, a certain channel among the input video channels is controlled so as not to be output and the number m ′ of video channels to be recorded is

[0034]

By increasing or decreasing the number of recording video channels with respect to the number of input video channels so as to satisfy m'ｍa · Pn (a is a natural number), as shown in FIG. In both cases, the search image can be displayed over the entire screen area.

FIGS. 13 and 14 show a case where a video signal of 5 channels is inputted and recorded and reproduced by a search at 5 × speed (k = 5), and a reference synchronization signal, that is, a video signal of a black screen is added as a sixth channel. It shows a reproduction trace locus and a search reproduction image at the time of recording, and a search reproduction image of the entire screen can be obtained with respect to FIG.

In the first embodiment, the vertical synchronizing signal from the synchronizing / separating circuit 52 shown in FIG. 15B is used together with a signal indicating the envelope level of the reproduced video signal detected by the envelope detecting circuit 58. The recording information period signal of FIG. 15C generated by the recording information period generation unit 59 based on the
Supplied to The tracking control signal generating means 60 generates a signal indicating a reproduction signal level during a period in which the recorded video information is added based on the two input signals so that the reproduction signal level during the recorded video information period is maximized. The servo unit 30 is controlled. That is, for the recording position 63 of the recorded video information in the recording tracks 61 and 62 having the azimuth angles α and β, respectively, the reproduction trace locus 64 is
For example, in the case shown in FIGS. 16 and 17, as shown in FIGS. 15D and 15E, the reproduced video signal output does not sufficiently obtain the reproduced signal level during the recorded video information period, Cannot be detected. On the contrary,
In the present invention, tracking control is performed from the state shown in FIGS. 16 and 17 to the state shown in FIG.
As shown in (2), the operation is performed so that the reproduction signal level in the recorded video information period is maximized, and at least a predetermined level at which the recorded video information can be normally detected is always obtained.

FIG. 19 shows an embodiment of a main part of the present invention, and the same or equivalent parts as those in FIG. 1 are denoted by the same reference numerals. In FIG. 19, the rotation phase pulse from the rotation phase detector 65 becomes the SW30 signal via the waveform shaping circuit 66, and the phase comparison circuit 67 outputs the reference signal generator 68
Is compared with the reference signal REF1 from the
6 rotates in phase with the reference signal REF1. on the other hand,
Reference signal REF2 from reference signal generator 68 is delayed by tracking variable circuit 69, and delayed reference signal DR
The phase of the EF2 and the control signal detected by the control head 28 are compared by a phase comparison circuit 70 to control the capstan motor 29. As a result, the capstan motor 29 controls the control signal and the delay reference signal DRE.
Drive control is performed so that F2 is phase-synchronized. Here, by varying the delay time in the tracking variable circuit 69, the phase relationship in the track width direction between the recording tracks 61 and 62 and the reproduction trace locus 64 can be varied. Therefore, the data processing circuit 71 receives a signal indicating the reproduction signal level during the recorded video information period from the tracking control signal generating means 60 and
Variably controls the delay time Td.

In the data processing circuit 71, first, the level signal during the recorded video information period at the present time (t1) is temporarily stored, and then the delay time Td in the tracking variable circuit 69 is increased by ΔT or And this results in
At this time (t2), it is determined whether the level signal during the recorded video information period has increased or decreased from the temporarily stored value. As a result, if it has increased, the delay time Td is further increased or decreased in the same direction by ΔT. If the temporary storage value has decreased, the direction of increase or decrease is reversed, and the delay time Td is decreased or increased by ΔT. At this time, the value of the level signal in the recorded video information period obtained at (t3) and the temporary storage value immediately before (t2) are repeatedly compared again, and the same operation is performed. By repeating such a series of operations, it is possible to automatically set and control the reproduction signal level during the period in which the recorded video information is added to almost the maximum value.

In the above embodiment, the case where the recording channel is sequentially changed for each recording track has been described. However, as shown in FIG. 20, the same recording channel has a plurality of tracks or a plurality of tracks. Even when the recording channel changes for each track, as shown in the operation of FIG. 21, the channel number is once detected in the normal reproduction mode or in the search reproduction mode. By keeping the write period control signal unchanged for the same channel, a good write period control signal can be obtained, and it goes without saying that the same effect as described above can be obtained.

[0040]

As described above, according to the present invention, the recorded video information such as the channel number added to the predetermined position can be detected automatically and accurately, and the normal writing period can be performed without mistake in the reproduction channel. A control signal is obtained, and a search reproduction image in which only a specific channel is always visible over the entire screen area can be realized. Moreover, a good search reproduction image can be obtained irrespective of the number of input video channels, the number of search double speeds, and the recording / running mode such as intermittent or normal speed. Thus, there is an effect that the recorded contents can be searched and confirmed very easily and easily at high speed.

[Brief description of the drawings]

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

FIG. 2 is an operation timing diagram at the time of intermittent 4ch recording and 5 × speed search in the configuration of the first embodiment of the present invention.

FIG. 3 is a timing chart of recording video information code addition according to the present invention.

FIG. 4 is a diagram showing encoding of channel number discrimination according to the present invention.

FIG. 5 is a diagram showing the position of a channel number discrimination code signal according to the present invention.

FIG. 6 shows an intermittent 4ch video recording / recording in the first embodiment of the present invention.
Playback screen for 5x search.

FIG. 7 shows an intermittent 5ch recording / recording in the first embodiment of the present invention.
Playback screen for 5x search.

FIG. 8 is a diagram illustrating a normal speed recording and a 5 × speed search.

FIG. 9 is an operation timing diagram at the time of normal speed 4ch recording and 5 × speed search in the configuration of the first embodiment of the present invention.

FIG. 10 is a reproduction screen at the time of normal speed 4ch recording and 5 × speed search in the first embodiment of the present invention.

FIG. 11 is a reproduction screen at the time of normal speed 5ch recording and 5 × speed search in the first embodiment of the present invention.

FIG. 12 is a diagram showing a state of a search reproduction image in the first embodiment of the present invention.

FIG. 13 is a diagram showing a recording pattern when 5 channels are input and a 5 × speed search in the first embodiment of the present invention.

FIG. 14 is a reproduction screen at the time of 6ch recording and 5 × speed search with respect to 5ch input in the first embodiment of the present invention.

FIG. 15 is a view for explaining an auto tracking operation in the first embodiment of the present invention.

FIG. 16 is a diagram showing a trace pattern at the time of search in the first embodiment of the present invention.

FIG. 17 is a diagram showing a trace pattern at the time of search in the first embodiment of the present invention.

FIG. 18 is a diagram showing a trace pattern at the time of a search in the first embodiment of the present invention.

FIG. 19 is a block diagram of an embodiment of a main part of the present invention.

FIG. 20 is a diagram showing a case where the same channel is recorded a plurality of times and a 5 × speed search is performed according to the present invention.

FIG. 21 is a diagram showing operation timings during multiple-time recording and 5 × speed search on the same channel according to the present invention.

FIG. 22 is a block diagram illustrating a configuration of a conventional example.

FIG. 23 is an operation diagram at the time of intermittent recording / reproduction with a conventional configuration.

FIG. 24 is an operation diagram at the time of intermittent recording / normal speed reproduction in a conventional configuration.

FIG. 25 is a diagram illustrating a case of a 5 × speed search in intermittent recording.

FIG. 26 is an operation timing diagram at the time of intermittent 4ch recording and 5 × speed search in the configuration of the conventional example.

FIG. 27 is a reproduction screen at the time of intermittent 4ch recording and 5 × speed search in a conventional example.

[Explanation of symbols]

4: video switching circuit, 11: cylinder, 12, 13, 1
4,15 ... magnetic heads H1 +, H2-, H3-, H4 +, 20,
21, 22, switch circuit, 27 system control means, 30
... Servo circuit, 32 ... Level detection circuit, 41, 52 ... Synchronization separation circuit, 42 ... Switching circuit, 43 ... Recording channel control means, 44 ... Recorded video information signal generation and addition means, 45 ...
Conversion circuit for recording, 46: Logic circuit, 47: Conversion circuit for reproduction, 48: A / D converter, 49: Image memory, 50
... D / A converter, 51 ... encoder circuit, 53 ... recorded video information detecting means, 54 ... write period control circuit, 55 ... write control circuit, 56 ... reference signal generation circuit, 57 ... read control circuit, 58 ... embero detection Circuit, 60: tracking signal generating means, 61, 62: recording track, 63: recording position of recorded video information, 64: trace position at the time of search,
66: waveform shaping circuit, 67, 70: phase comparison control circuit,
68: Reference signal generator, 69: Tracking variable circuit,
71: Data processing circuit.

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[Procedure amendment]

[Submission Date] February 28, 2002 (2002.2.2)
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Recording / reproducing apparatus and reproducing apparatus

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

1. A recording and reproducing apparatus for recording and reproducing a magnetic recording medium a plurality of kinds of video signal by the rotary magnetic head, for each of the plurality of types of video signals, the additional video information for identifying the type of the video signal Recording means for recording the video information, detecting the video information from the reproduction signal during search reproduction,
A recording / reproducing apparatus, comprising: reproducing means for identifying a type of a video signal based on detected video information and outputting a desired type of video signal.

2. The recording / reproducing apparatus according to claim 1, wherein the plurality of types of video signals are video signals of a plurality of channels, and the video information is information for identifying a channel.

3. The recording / reproducing apparatus according to claim 1, wherein said reproducing means has storage means for storing a desired type of video signal identified by said video information.

Wherein said reproducing means, recording and reproducing apparatus according to claim 1, characterized in that outputs the reconstructed full screen video signal from the video signal of the rotating partial screen reproduced by the magnetic head .

5. A reproducing apparatus for reproducing a plurality of types of video signals recorded on a magnetic recording medium with video information for identifying the type of the video signal added thereto by a rotating magnetic head. Detecting the video information,
A reproducing apparatus comprising: reproducing means for identifying a type of a video signal based on detected video information and outputting a desired type of video signal.

Wherein said plurality of types of video signals is a video signal of a plurality of channels, reproduction apparatus according to claim 5 wherein the video information to be information for identifying a channel.

Wherein said reproducing means, reproducing apparatus according to claim 5, characterized in that it comprises a storage means for storing the desired type of video signal identified by said image information.

8. The reproducing apparatus according to claim 5 , wherein said reproducing means reconstructs and outputs a full-screen video signal from a partial-screen video signal reproduced by said rotary magnetic head.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus and a reproducing apparatus which are used, for example, for monitoring and crime prevention and which record and reproduce video signals intermittently without frames.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010] It is an object of the present invention, even at the time of search reproduction, recording channel number can be accurately detected, and good search reproduction picture of each video channel can be obtained without any irregularity of the screen, the recording and reproducing apparatus can be confirmed recognize quickly recorded contents And a playback device .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

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[0011]

According to the present invention, in order to achieve the above object, a plurality of types of video signals are supplied to a rotating magnetic head.
Recording / reproducing apparatus that records / reproduces data on / from a magnetic recording medium.
And for each of the plurality of types of video signals,
Recording means for adding and recording video information for identifying
Detects the video information from the playback signal during search playback
And identifies the type of video signal based on the detected video information
Playback means for outputting a desired type of video signal.
I did.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012] Further, a type for identifying the type of the video signal is provided.
Multiple types recorded on magnetic recording media with video information added
Device that reproduces video signals of a kind with a rotating magnetic head
At the time of search reproduction, the video information from the reproduction signal
And the type of video signal is determined based on the detected video information.
Playback means for identifying and outputting a desired type of video signal.
Provided.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0013

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[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

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[0014]

According to the above arrangement, at the time of recording, each input video signal
After video information such as each channel number is added to
The data is recorded on the magnetic recording medium by the rotating magnetic head.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

At the time of reproduction, video information added at the time of recording
Is detected and a reproduced video signal of only a specific desired channel is detected.
Write the portion to the storage means. Next, only specific channels
The video signal is sequentially read from the stored storage means.
U. This allows each channel to be played back without being multiplexed.
A search playback image of only the desired specific channel can be obtained.
You can search and confirm the recorded content easily and easily at high speed.
You.

[Procedure amendment 10]

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[Correction target item name] 0016

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[Correction method] Deleted

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/915 H04N 7/18 D 7/18 5/91 K (72) Inventor Hajime Takasugi Katsuta, Ibaraki 1410 Inada, Hitachi, Ltd.AV Equipment Division (72) Inventor Tetsuo Sakai Inada 1410, Inada, Katsuta, Ibaraki Prefecture Hitachi, Ltd. AV Equipment Division (72) Inventor Minoru Ueda, Inada, Katsuta, Ibaraki 1410 Address: Hitachi, Ltd., AV Equipment Division (72) Inventor: Yuji Sato Inada, Katsuta-shi, Ibaraki 1410 Address: Hitachi, Ltd., AV Equipment Division (72) Inventor: Hideo Nishijima Yoshida, Yoshida, Totsuka-ku, Yokohama-shi F-term (reference) in Hitachi, Ltd. Video Media Research Laboratories, 292, Machi. 5C018 JA02 JA07 JA10 JB04 JC04 5C053 FA12 HA24 HA29 HA33 KA01 LA01 5C054 CA01 CC02 EA07 EB05 EB07 GA01 GB01 HA18 5D044 BC01 CC03 DE49 FG18 FG24 GK11 5D097 AA02 BB06 CC02 CC05 EE02 JJ04 JJ07 LL02 LL13

Claims (3)

[Claims] A video switching means for switching a plurality of input video signals in units of fields or frames to generate a continuous video signal, and a channel number corresponding to each channel of the plurality of input video signals. A recording video information generating and adding unit for generating a signal indicating the recorded video information and adding the recorded video information signal to a predetermined position of the continuous video signal from the video switching unit, and an output from the recorded video information generating and adding unit A magnetic recording / reproducing means for recording / reproducing a video signal on a diagonal track on a tape by a rotating magnetic head, and a servo means for controlling rotation of the magnetic head and a running operation of the tape, wherein the servo means,
A time-lapse magnetic recording / reproducing device that performs tracking control of rotation of the magnetic head and tape running so that a reproduction signal of a portion at the predetermined position to which the recorded video information signal is added is obtained at a predetermined level or more during search reproduction. apparatus. 2. A video switching means for switching a plurality of input video signals on a field or frame basis to generate a continuous video signal, and a channel number corresponding to each channel of the plurality of input video signals. A recording video information generating and adding means for generating a signal indicating the recorded video information and adding the recorded video information signal to a predetermined position of the continuous video signal from the video switching means; A magnetic recording / reproducing means for recording and reproducing the output video signal from the means on an oblique track on the tape, and a search / reproduction video signal by selectively switching a magnetic head having a higher output level from among the reproduction outputs from the magnetic head during search reproduction. Playback video signal generation means for generating
Recorded video information detecting means for detecting the recorded video information added at the time of recording from the output of the reproduced video signal generating means; A / D conversion of the reproduced video signal and temporarily writing it in an image memory, and then D / A conversion Image memory means for reading;
Writing period control means for controlling a writing period to the image memory means for each video channel in accordance with an output from the recorded video information detecting means; writing control means for controlling writing to the image memory means; Reading control means for controlling reading from the means, and a tape running speed k × v (v: normal tape running speed, k
Servo means for controlling the forward / reverse search in each forward / reverse direction), and the tape traveling speed k during the search is defined as the product of the prime numbers Pn, and | k | = P1 ^L1 · P2 ^L2・ P3 ^L3 ......... Pn
^{When Ln} (Ln is a natural number) and the number q of video channels input to the video switching means is expressed by the following equation, q = a · Pn (a is a natural number), A time-lapse magnetic recording / reproducing apparatus characterized by increasing or decreasing the number m of video channels recorded by a reproducing means so as to satisfy the following equation: m ≠ a · Pn (a is a natural number). 3. A video switching means for switching a plurality of input video signals on a field or frame basis to generate a continuous video signal, and a channel number corresponding to each channel of the plurality of input video signals. Generating a signal indicating the recorded video information, and adding the recorded video information signal to a predetermined position of the continuous video signal from the video switching unit; The two magnetic head pairs provided are arranged on the rotary cylinder in opposition to each other at approximately 180 degrees, and the output video signal from the recorded video information generation / addition means is recorded on the diagonal track on the tape by the magnetic head pair. Magnetic recording / reproducing means for reproducing, and for each track reproduced at the time of search reproduction in which the magnetic head pair traces across recording tracks A reproducing track switching signal generating means for generating a signal indicating a switching point; and a magnetic field having a large output level among reproduction outputs from the magnetic head pair in response to an output from the reproducing track switching signal generating means during search reproduction. Playback video signal generation means for selectively switching the head side to generate a playback video signal; recorded video information detection means for detecting recorded video information added during recording from an output of the playback video signal generation means; A / D converted and temporarily written into the image memory, and then D /
Image memory means for A-converting and reading, and writing period control means for controlling a writing period to the image memory means for each video channel in accordance with an output from the recorded video information detecting means and the reproduction track switching signal generating means When,
Writing control means for controlling writing to the image memory means, reading control means for controlling reading from the image memory means, and a tape traveling speed of k × v (v:
Servo means for controlling the normal tape running speed, and the sign of k indicates the time of each forward / reverse search), and generates the write period control signal based on the reproduction track switching signal, In the case where only the video channel is written into the image memory means and the same video channel is searched and reproduced a plurality of r consecutive tracks,
A time-lapse magnetic recording / reproducing apparatus, wherein the same r image channels are written to the image memory means for the plurality of r times.