JPH04282982A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the recording of video signals to a video area without intermission, that is, consecutive recording till the recording of a video signal of a still picture is finished from the video recording end operation and to prevent a video signal of a moving picture not intended by the photographer to be recorded to the video area. CONSTITUTION:A still picture video signal processing section 30 records one field of a video signal from a camera section 10 to a PCM audio area as a still picture. In this case, a moving picture video signal processing section 20 records a video signal from the camera section 10 to a video area as a moving picture. A control section 50 stops the operation of the still picture video signal processing section 30 with a video recording stop signal and the video signal from the camera section 10 is stored in a video RAM 22 and the stored video signal is repetitively read till the recording of the video signal of the still picture is finished by using the video recording stop signal and recorded on a video area.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a video signal recording and reproducing device, which records still images as digital video signals in a so-called PCM audio area of a magnetic tape used in, for example, a so-called 8 mm video tape recorder, and reproduces the same. The present invention relates to a video signal recording and reproducing device.

0002

2. Description of the Related Art Apparatuses for recording video signals on a recording medium, such as a magnetic recording medium, are used to record video signals of still images, for example.
In other words, there are so-called electronic still cameras that record video signals for one field or frame on a so-called still video floppy, and so-called camera-integrated 8mm video tape recorders (hereinafter referred to as camera-integrated 8mm VTRs) that record video signals of moving pictures on magnetic tape. ) etc. are known.

Specifically, for example, a camera-integrated 8mmV
In TR, magnetic tape is wound around a so-called rotating head drum at an angle of 211 degrees, and a pair of heads (hereinafter referred to as rotating heads) spaced 180 degrees apart helically scans the magnetic tape, as shown in Figure 6. Then, diagonal tracks 81 are formed on the magnetic tape 80. and,
In the video area 82 corresponding to 180 degrees of the rotating head drum of each track 81, a luminance signal is FM modulated, a carrier color signal is converted to a low frequency, an audio signal is FM modulated, and a tracking signal for tracking servo is applied. , for example, the so-called ATF (Automatic Track F
(inding) The signal is frequency-multiplexed and recorded together with a pilot signal for control. In addition, in the PCM audio area 83 corresponding to about 30 degrees of the remaining rotating head drum of each track 81, a non-linear quantized 8-bit/sample digital audio signal (hereinafter referred to as PCM audio signal) has an error. After being subjected to so-called cross-interleave code processing for correction, a synchronization signal, parity, ID, etc. are added and recorded. Further, fixed heads scan each side of the magnetic tape 80 to form a cue track 84.
and an audio track 85 is formed. In the cue track 84, a cue signal used for, for example, the address or beginning of the recorded content is recorded, and the audio track 84
5 includes, for example, after-recording.
g) audio signals are recorded.

[0004] Furthermore, as disclosed in, for example, Japanese Unexamined Patent Publication No. 58-164383, there is a method for displaying (superimposing) a title, cast, explanation, etc. on the video recorded in the video area 82. In addition, a technique is known in which still images such as text information are photographed and recorded in the PCM audio area 83 (dub-recording).

[0005]

By the way, the above-mentioned electronic still camera is generally known as a device for recording video signals of still images, but the above-mentioned camera-integrated 8 mm
It is conceivable to use a VTR as a video signal recording and reproducing device that records or reproduces a video signal obtained by photographing a still image in a PCM audio area as a still image digital video signal.

[0006] In this case, various photographing modes are possible. For example, each time a so-called record key is operated (pressed), one still image is generated, that is, one still image shot in which one field or one frame worth of video signal from the image sensor is converted into a digital signal and recorded in the PCM audio area. 2 from the shooting mode or the first operation of the recording key, for example.
A continuous still image shooting mode may be considered, in which video signals of a plurality of still images are continuously recorded before the second operation.

Furthermore, in the one-shot still image shooting mode or the continuous still image shooting mode, an analog video signal that is continuously obtained from the image sensor while recording a still image video signal is used as a moving image video signal. One possible example is a simultaneous still image and moving image shooting mode in which the still image video signal is recorded in the video area of the track recorded. That is, for example, in the still image one-shot shooting mode, when the record key is operated, the video signal from the image sensor is converted into a digital signal, and one field or one frame of this digital video signal is temporarily stored in the memory. do. Then, when one field or one frame worth of video signal has been stored, it is read out, and the read out video signal is subjected to signal processing such as data compression as required, and then recorded in the PCM audio area of the magnetic tape. In this case, unlike recording an analog video signal in a video area, several tens to hundreds of tracks are required to record one field or one frame worth of video signal. Therefore, by simultaneously recording video signals continuously obtained from the image sensor as analog signals in the video area of several tens to hundreds of tracks, the above-mentioned simultaneous still image and moving image shooting mode can be performed. Note that the number of tracks required to record the digital video signal of one still image in the PCM audio area depends on, for example, the compression rate in the data compression described above.

By the way, in the still image and moving image simultaneous shooting mode, for example, in the still image single shot shooting mode, when the photographer operates (presses) the record key, the PCM audio area of the still image video signal is Thinking that recording has been completed, I moved the 8mm VTR with integrated camera from the subject.
There is a high possibility that it will be removed. However, to record one still image, that is, one field or one frame worth of digital video signals, dozens to hundreds of tracks are required as described above, and the video signal must be recorded after operating the record key. It takes time to complete the process, and when the camera-integrated 8mm VTR is removed from the subject, a video signal of a moving image that is contrary to the photographer's wishes will be recorded in the video area. For example, if the camera-integrated 8mm VTR is pointed at the ground immediately after operating the record key, a video signal with the ground as the subject will be recorded in the video area until recording of the still image video signal is completed. When the video signal recorded in the video area in this manner is reproduced, an unnecessary image that was not intended by the photographer will be displayed on the screen of, for example, a monitor receiver.

[0009] To avoid this, it is conceivable to stop recording the video signal of the moving image immediately upon operating the record key, but the end positions of the video signals of the still image and the moving image on the magnetic tape may be the same. I won't be able to do it. In other words, the video signal recorded in the video area of the magnetic tape is interrupted, making so-called continuous shooting impossible. As a result, when the video signal recorded in the video area is reproduced, the image is interrupted and becomes very unsightly.

[0010] The same can be said of the still image continuous shooting mode in the still image and moving image simultaneous shooting mode. That is, the above-mentioned problem occurs from the time when the recording key is operated for the second time to end photography until the recording of the video signal of the last still image is completed.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to simultaneously record a video signal of a moving image and a video signal of a still image in a video area and a PCM audio area of a magnetic tape. The video signal can be recorded in the video area without interruption from the time when the recording of the video signal of the still image is completed until the recording of the video signal of the still image is actually completed.
It is an object of the present invention to provide a video signal recording and reproducing device that can prevent a video signal of a moving image that is not intended by the photographer from being recorded in this video area.

0012

[Means for Solving the Problems] In order to solve the above problems, in the present invention, each track on a magnetic tape formed by helical scanning is divided into a first area and a second area. In a video signal recording and reproducing apparatus that records an analog video signal in the second region, records a digital signal in the second region, and reproduces the recorded analog video signal and digital signal, at least one of the video signals
a memory having a storage capacity for one field or one frame and storing an input video signal; and a first memory for recording a video signal read from the memory or the input video signal as a video signal of a moving image in the first area. a recording means;
a second recording means for converting the input video signal into a digital video signal and recording one field or one frame of the digital video signal in the second area as a video signal for one still image; A control signal for controlling the stop of the operation of the second recording means and writing in the memory is outputted, and after outputting the control signal, the second recording means records a video signal for one still image. A control means for controlling the first recording means to read and record the video signal stored in the memory according to the control signal, and a control means for controlling the analog video signal recorded in the first area until the completion of The present invention is characterized by providing a first reproducing means for reproducing a video signal of a moving image, and a second reproducing means for reproducing a digital video signal recorded in the second area as a video signal of a still image.

[0013]

[Operation] In the video signal recording and reproducing apparatus according to the present invention, the second
The input video signal is converted into a digital video signal by the recording means, and one field or one frame of this digital video signal is recorded in the second area as a video signal for one still image, and at the same time, the first recording When the means records the input video signal as a video signal of a moving image in the first area, the control signal causes the recording operation of the second recording means to be stopped at the time when the recording of the video signal of the still image is completed; The input video signal is stored in the memory according to the control signal. During the period from when the second recording means receives the control signal to when the second recording means completes recording of the video signal for one still image,
The first recording means reads out the video signal stored in the memory and records it in the first area. Further, the analog video signal recorded in the first area is played back as a video signal of a moving image, and the digital video signal recorded in the second area is played back as a video signal of a still image.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a video signal recording and reproducing apparatus according to the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a so-called camera-integrated 8mm VTR (hereinafter simply VTR).
This is applied to a VTR (referred to as a TR), and Figure 1 shows this VTR.
There is a block circuit diagram showing the circuit configuration of.

As shown in FIG. 1, this VTR includes a camera section 10 that converts an image signal into a digital video signal and also performs signal processing such as so-called contour compensation and gamma correction.
Then, the video signal from the camera section 10 is converted into an analog signal and outputted as a video signal of a video recorded on the magnetic tape 1, and each video signal of the reproduced video or still image is converted into, for example, the so-called NTSC system. A moving image signal processing unit 20 that converts into a compliant video signal, and the camera unit 10
1 field or frame of the video signal is subjected to signal processing such as data compression as necessary, outputted as a still image video signal to be recorded on the magnetic tape 1, and reproduced as a still image video signal. A still picture video signal processing section 30 time-division multiplexes the analog video signal from the moving picture video signal processing section 20 and the digital video signal from the still picture video signal processing section 30 to produce a so-called video area of the magnetic tape 1. and a head section 40 that records video signals of moving pictures and digital video signals of still pictures, respectively, in a so-called PCM audio area, and controls the moving picture signal processing section 20, still picture video signal processing section 30, etc. 50.

The camera unit 10 performs various signal processing on the video signal obtained by photographing the subject, such as contour compensation and blackout to compensate for the insufficiency of the high spatial frequency components of the optical system and image sensor. Signal processing such as so-called pedestal clamping is performed to prevent the so-called pedestal level, which is a level reference, from changing, and the video signal subjected to this signal processing is sent to the moving picture video signal processing section 20 and the still picture video signal processing section 30.
It is designed to be supplied to This camera section 10 has C
A CD image sensor (hereinafter referred to as CCD) 11 and the C
The so-called AGC (Automatic
ic Gain Control) and the S/H & AGC circuit 12 which performs sampling, and the S/H &
An analog/digital (hereinafter referred to as A) converts the sampled video signal from the AGC circuit 12 into a digital signal.
/D) converter 13, and the digital video signal converted into a digital signal from the A/D converter 13 is subjected to contour compensation, pedestal clamp, white clip, etc.
It is comprised of a camera processing circuit 14 that performs various signal processing such as knee correction, gamma correction, and black clipping.

The moving image signal processing section 20 sequentially records the digital image signal from the camera section 10, for example, field by field under the control of the control section 50, and sequentially reads out the stored digital image signal. In addition to converting the video signal into an analog video signal and supplying it to the head section 40, the video signal reproduced from the video area by the head section 40 or the video signal from the still image video signal processing section 30 is converted into an analog video signal based on, for example, the so-called NTSC system. It is designed to convert to an analog video signal and output it. This moving image signal processing section 20 includes the camera process circuit 14
a video RAM 22 for storing, for example, one field or one frame of a video signal from the video RAM 2;
The luminance signal of the video signal read out from 2 is FM modulated by a predetermined carrier wave, the carrier color signal is converted to a low frequency, and then frequency multiplexed (hereinafter, this multiplexed signal is referred to as video data). For example, the video signal from the video signal processing section 30 or the reproduced video data is
A video processing circuit 21 that converts into a video signal compliant with the SC system, and an NTSC signal from the video processing circuit 21.
A digital/
An analog (hereinafter referred to as D/A) converter 23, a D/A converter 24 that converts the video data from the video processing circuit 21 into an analog video signal, and an analog video reproduced from the video area by the head section 40. Analog/digital (hereinafter referred to as A/D) that converts signals into video data
) converter 25.

The still image video signal processing unit 30 performs signal processing such as data compression on one field or one frame of the video signal from the camera unit 10 as necessary, and then converts it into a synchronization signal and an error correction code. etc. are added and supplied to the head section 40, and conversely, the head section 40 supplies the PC
The digital video signal reproduced from the M audio area is subjected to signal processing such as data expansion processing and is supplied to the moving image video signal processing section 20. This still image video signal processing section 30 includes a video RAM 32 that stores one field or one frame of the camera process circuit 14 or the reproduced video signal, and
For example, so-called adaptive dynamic range coding (ADRC) is applied to the video signal read out from 2.
Dynamics Range Coding) or so-called sub-sampling (Sub Sampling) as necessary (hereinafter, this compressed video signal will be referred to as compressed data), or conversely, the compressed data may be subjected to data expansion processing. A still image video processing circuit 31 that reproduces a video signal, a RAM 34 that temporarily stores the compressed data, and a synchronization signal, an error correction code, and a video signal input from the control section 50 to the compressed data read out from the RAM 34. An identification code (hereinafter referred to as ID) indicating the sampling frequency, presence or absence of data compression, etc. is added (hereinafter compressed data with this ID etc. added is referred to as still image data), and conversely, error correction processing is performed on the still image data. and a PCM process circuit 33 that reproduces the ID from the still image data and supplies it to the control section 50.

The head unit 40 time-division multiplexes the analog video signal from the moving video signal processing unit 20 and the digital video signal (still image data) from the still image video signal processing unit 30 to generate the data on the magnetic tape 1. In addition to recording in the video area and the PCM audio area, the moving image analog video signal and still image data are reproduced and supplied to the moving image video signal processing section 20 and the still image video signal processing section 30, respectively. This head section 40 time-division multiplexes the analog video signal from the moving video signal processing section 20 and the still image data from the still image video signal processing section 30, and also converts the analog video signal of the moving image and the still image from the reproduction RF signal. A MUX 41 that reproduces data, an amplifier 43 that amplifies the time-division multiplexed recording signal from the MUX 41,
an amplifier 44 that amplifies the reproduced RF signal; and the amplifier 43
and a changeover switch 42 that switches the amplifier 44 between recording and reproduction, and a signal is recorded on the magnetic tape 1 based on the excitation current from the amplifier 43, and a reproduced RF signal is reproduced and supplied to the amplifier 44. It is composed of a rotating head 45.

The control unit 50 controls the VTR to operate in various operation modes, such as a video shooting mode in which a video signal of a video is recorded, each time a so-called record key is operated (pressed) to record a video signal of one still image. Single-shot still image shooting mode for recording, continuous still image shooting mode for recording video signals of multiple still images continuously from the first operation of the record key until the second operation, and video The video signal processing unit 20, still image signal processing unit 30, etc. are controlled to operate in a video playback mode for playing back video signals of a still image, a still image playback mode for playing back a still image video signal, etc. It has become. This control unit 50 includes a function control circuit 51 that sets an operation mode, controls each unit to operate in accordance with the mode set by the function control circuit 51, and also inputs the above-mentioned ID to the PCM process circuit. 33 and conversely the recovered ID from the PCM process circuit 33.
A system controller 52 that controls signal processing such as data expansion processing of the still image video signal processing section 30 based on
and a memory controller 53 that controls the addresses of the video RAMs 22 and 32 under the control of the system controller 52.

The magnetic tape 1 has a tape format similar to, for example, the magnetic tape 80 shown in FIG. 6 described above. That is, the tracks formed diagonally by the helical scanning of the rotary head 45 are divided into the video area and the PC.
It is divided into M audio areas, in which video signals of moving images are recorded as analog signals, and video signals of still images are recorded as digital signals in the PCM audio area.

Next, a VTR having the above configuration will be described.
The operation will be explained. By setting the operation mode of this VTR in the function control circuit 51, this VTR is capable of performing various types of photographing/playback as described above. Furthermore, in the above-mentioned still image single-shot shooting mode or still image continuous shooting mode, the video signal of the still image is transferred to the magnetic tape so that so-called continuous shooting of the video area, that is, an area where no video signal is recorded, does not occur. P of
At the same time as recording in the CM audio area, the video signal from the camera unit 10 is recorded in the video area corresponding to the PCM audio area where the still image video signal is recorded. Also, at this time, to prevent the video signal of the subject not intended by the photographer from being recorded in the video area,
One field or one frame of the video signal from the camera unit 10 at the time when the operation to stop shooting is performed is stored in the memory, and from the time when the operation to stop shooting is performed until the recording of the video signal of the still image is completed. The video signal stored in the memory is repeatedly read out and recorded in the video area.

Specifically, when the function control circuit 51 is set to, for example, a still image continuous shooting mode, the system controller 52 detects a control signal corresponding to the setting and operates each part in the still image continuous shooting mode. control to do so. Then, when the recording key (not shown) is operated for the first time, the system controller 52 detects a recording start signal supplied as a trigger signal, for example, via the terminal 54, and the system controller 52 detects the recording start signal supplied as a trigger signal, for example. One field or one frame obtained at a predetermined period of the signal is continuously recorded in the PCM audio area 3 of the magnetic tape 1 as video signals of still images #1, #2, and #3, as shown in FIG. 2, for example. At the same time, these still images #1, #2, #
The video signal from the camera unit 10 is controlled to be recorded as the video signal of the moving image #1 in the video area corresponding to the PCM audio area in which the video #3 is recorded. Next, when the recording key is operated for the second time, the system controller 52 detects a recording stop signal also supplied as a trigger signal from the terminal 54, and detects one field or one frame of the video signal from the camera section 10. is stored in the video RAM 22, and the time t from when the recording stop signal is detected until the recording of the video signal of still image #3 is actually completed is controlled to repeatedly read the video signal from the video RAM 22 and record it in the video area. It is supposed to be done. Note that the period of the above-mentioned predetermined period depends on, for example, the sampling frequency, data compression, etc.
This is the reciprocal of the recording time required to record a frame's worth of video signals.

That is, the imaging signal from the CCD 11 is
The signal is subjected to AGC in the S/H&AGC circuit 12 and the A/D converter 13, and is converted into a digital signal and supplied to the camera process circuit 14.

The camera processing circuit 14 subjects the video signal from the D/A converter 13 to signal processing such as contour compensation, pedestal clamp, white clip, knee, gamma correction, and black clip. The video signal subjected to this signal processing is supplied to the video RAM 22 via the video processing circuit 21 and also supplied to the video RAM 32 via the still image video processing circuit 31.

The video RAM 32 stores one field or one frame of a video signal based on a write address from the memory controller 53 that is synchronized with the line sequential scanning of the CCD 11. The video signal for one field or one frame recorded in the video RAM 32 is sequentially read out from the memory controller 53 using read addresses synchronized with data compression processing, etc., and is supplied to the still image video processing circuit 31.

The still image video processing circuit 31 processes, for example, ADRC on the sequentially read out video signals as necessary.
The video signal subjected to the data compression processing, that is, the compressed data, is supplied to the RAM 34 via the PCM process circuit 33. Then, the RAM 34 temporarily stores this compressed data.

The PCM process circuit 33 adds a synchronization signal, an error correction code, and an ID supplied from the system controller 52 to the compressed data read out in a predetermined order from the RAM 34 to identify the sampling frequency, presence or absence of data compression, etc. still image data is generated, and this still image data is supplied to the MUX 41.

On the other hand, the video RAM 22 is controlled by the camera process circuit based on a so-called write enable signal high level (hereinafter referred to as H level) from the memory controller 53 that permits writing, and a write address synchronized with the line sequential scanning of the CCD 11. The so-called read enable signal, for example, H
The video signals are read out in the order in which they were stored based on the level and read address, and the read video signals are supplied to the video processing circuit 21.

The video process circuit 21 includes a video RAM
After FM modulating the luminance signal of the video signal from 22 using a predetermined carrier wave and converting the carrier color signal to a low frequency, frequency multiplexing is performed to generate video data, and this video data is D/A
Converter 24 is supplied. The D/A converter 24 converts the video data into an analog video signal and supplies it to the MUX 41 . Further, the video process circuit 21 includes a video RAM 22
The video signal from the converter is converted into a video signal based on the NTSC system, for example, and is supplied to the D/A converter 23. The D/A converter 23 converts a video signal (digital signal) conforming to the NTSC system into an analog signal, and sends it to, for example, a monitor receiver via a terminal 26. As a result, the image being captured can be monitored.

The MUX 41 receives a video signal of a moving image from the D/A converter 24, that is, an analog video signal obtained by converting the moving image data into an analog signal, and a video signal of a still image from the PCM process circuit 33, that is, still image data. are time-division multiplexed and supplied to the rotary head 45 via the changeover switch 42 and amplifier 43. As a result, P of the magnetic tape 1
Digital video signals of still images are recorded with IDs in tens to hundreds of tracks in the CM audio area, and digital video signals of still images are recorded in the corresponding tracks of the video area. An analog video signal is recorded. Specifically, for example, as shown in FIG.
Each video signal of n, #n+1, and #n+2 is recorded in the PCM audio area, and a video signal of a moving image is recorded in the corresponding video area.

The operation of the continuous still image shooting mode described above is completed as follows. When the recording key is operated for the second time, the system controller 5
2, as shown in FIG. 3 above, detects a recording stop signal supplied as a trigger signal via the terminal 54, and controls the memory controller 53 to set the write enable signal of the video RAM 22 to L level and send it out. do. That is, updating of the video signal stored in the video RAM 22 is stopped, and the video signal for one field or one frame photographed by the camera section 10 at the time when the recording stop signal is detected is held in the video RAM 22.

At this time, the system controller 52 selects the still image #n stored in the video RAM 32.
The memory controller 53 is controlled to maintain the read enable signal of the video RAM 22 at H level until all of the +2 video signals are recorded in the PCM audio area of the magnetic tape 1. That is, video RAM 22
One field or one frame worth of video signals held in is repeatedly read out and repeatedly recorded in the video area corresponding to the PCM audio area where the video signal of still image #n+2 is recorded. In other words, the video RAM 22 is in the area from the detection of the recording stop signal in the video area until the recording of the video signal of still image #n+2 is completed.
The video signal held in is recorded as a still image. As a result, it is possible to match the position where recording of the video signal ends in the PCM audio area and the video area. It is possible to record video signals, that is, to perform continuous shooting. Furthermore, even if the VTR is removed from the subject immediately after the second operation of the record key, video signals of the subject not intended by the photographer will not be recorded.

[0034] In the above-described embodiment, whenever the video signal of a moving image is recorded in the video area, the video signal from the camera unit 10 is always passed through the video RAM 22, that is, it is written once and then read out. ,for example,
When recording the video signal of a video, the video RAM 22
Alternatively, the video signal from the camera section 10 may be stored in the video RAM 22 by a recording stop signal only when shooting ends.

[0035] Also, for example, when the recording key is operated for the second time,
In other words, from the time when the operation to stop recording is performed, the level of the video signal repeatedly read out from the video RAM 22 gradually decreases.
Out) processing may be performed and recorded. This fade-out is performed, for example, based on a data block number that identifies a track on which a still image video signal is recorded.

Specifically, a signal processing circuit that performs a fade-out (hereinafter referred to as a fade-out circuit) has a coefficient α (x
), (1-α(x)), a multiplier 62 that multiplies the video signal supplied through the terminal 65 by a coefficient α(x), and the video signal supplied through the terminal 66. It consists of a multiplier 63 that multiplies the video signal by a coefficient (1-α(x)), and an adder 64 that adds the outputs of the multipliers 62 and 63.

Then, this fade-out circuit is provided, for example, in the video processing circuit 21, and the video signal from the video RAM 22 is supplied to the multiplier 62 via the terminal 65.
A video signal corresponding to, for example, a black level is supplied to the multiplier 63 via the terminal 66, and a control signal for controlling the coefficient α(x) from the system controller 52 is supplied to the fader level control circuit 61 via the terminal 67. , the faded out video signal is outputted via the terminal 68.

That is, as shown in FIG. 5, for example, the system controller 52 determines the number of tracks TE required to record the video signal of one still image, and when recording of the video signal of the still image has started. The number of tracks (TE- TS) and supplies a control signal indicating the number of remaining tracks to the fader level control circuit 61. The fader level control circuit 61 calculates a reduction rate Δ for reducing the video signal for each track using the following formula, for example, and calculates this reduction rate Δ and a track number representing the number of tracks based on the track in which the recording stop signal was detected. The fader level α(x) of each track is calculated using x. Δ=1/(TE-TS) α(x)=1-Δ×x

The multiplier 62 then adjusts the fader level α
(x) and the level Y of the video signal from the video RAM 22, a video signal of level Z is determined by the following formula and is supplied to the adder 64. Z=α(x)×Y

The adder 64 adds the video signal from the multiplier 62 (level Z) and the video signal from the multiplier 63 (a black level video signal is supplied, and the output level is zero) and outputs the result. do. As a result, the level Z decreases as the track number x increases, and when the recording of the still image video signal is completed, a faded video signal whose level Z becomes zero is output via the terminal 68, and this video signal is A signal is recorded in the video domain.

Next, a video signal of a moving image is recorded as an analog signal in the video area as described above, and a video signal of a still image or The operation of reproducing a video signal of a moving image will be explained.

For example, when the system controller 52 sets the function control circuit 51 to a video playback mode,
A control signal corresponding to the setting is detected and each part is controlled to operate in the video playback mode.

Specifically, an analog video signal of a moving image reproduced by the head unit 40 from the video area of the magnetic tape 1 is converted into moving image data by the A/D converter 25 and supplied to the video processing circuit 21. .

The video processing circuit 21 performs various types of signal processing on this moving image data, such as contour compensation to compensate for deterioration of high-frequency components of the video signal in the reproduction system, and also performs signal processing on the video data that has been subjected to this signal processing. After converting the signal into a video signal compliant with the NTSC system, it is sent to a monitor receiver via a D/A converter 23 and a terminal 24. As a result, a moving image is displayed on the screen of the monitor receiver. In this case, when continuous shooting is performed in the simultaneous video and still image shooting mode as described above, the video signal is played back without interruption, and images can be displayed continuously.

Furthermore, by subjecting the video signal to fade-out signal processing as described above and recording it in the video area, it is possible to perform playback in which the movement of the image stops and the image gradually disappears. .

On the other hand, for example, when the function control circuit 51 sets the still image playback mode, the system controller 52 detects a control signal corresponding to the setting and controls each part to operate in the still image playback mode. .

Specifically, the PCM process circuit 33:
From the PCM audio area of the magnetic tape 1 to the head section 40
Error correction processing is performed on the still image data reproduced by the system, and synchronization signals, IDs, etc. are separated and detected. The detected ID is supplied to the system controller 52, and the error-corrected compressed data is temporarily stored in the RAM 34. The compressed data read from the RAM 34 is then supplied to the still image video processing circuit 31.

The system controller 52 determines the conditions under which the still image video signal is recorded, such as the sampling frequency and the presence or absence of data compression, based on the ID from the PCM process circuit 33, and the still image video process circuit 31 determines the conditions under which the still image video signal is recorded. Control so that it operates in accordance with the conditions.

The still image video processing circuit 31 performs ADRC decoding processing and interpolation processing on the compressed data as necessary under the control of the system controller 52 to reproduce a video signal. This reproduced video signal is supplied to the video RAM 32.

Video RAM 32 stores video signals based on write addresses from memory controller 53. Then, when one field or one frame of the video signal is stored, the video RAM 32 repeatedly reads out the recorded video signal based on the read address from the memory controller 53 and supplies it to the video processing circuit 21.

The video processing circuit 21 performs various signal processing such as contour compensation on this video signal, and converts the video signal subjected to this signal processing into a video signal compliant with the NTSC system. , D/A converter 23
and is sent to the monitor receiver via the terminal 24. As a result, a still image is displayed on the screen of the monitor receiver.

Next, a still image one-shot shooting mode will be described in which the video signal of one still image is recorded each time the recording key is operated once. When the function control circuit 51 sets the still image one-shot shooting mode, the system controller 52 detects a control signal corresponding to the setting and controls each part to operate in the still image continuous shooting mode. ing. That is, when the recording key is operated, the system controller 52 connects the terminal 5 every time the recording key is operated.
4, one field or one frame of the video signal shot by the camera unit 10 is transferred to the video area of the magnetic tape 1 and the PCM every time the recording key is operated. It is designed to control what is recorded in each audio area.

Specifically, when the recording start signal is detected, the system controller 52 converts one field or one frame of the video signal from the camera unit 10 into a video R.
The memory controller 53 is controlled so that the information is stored in the AMs 22 and 32, respectively.

Then, the video signal stored in the video RAM 22 is repeatedly read out and recorded in the video area, as in the case of recording the video signal of still image #n+2 in the above-described still image continuous shooting mode. .

[0055] Furthermore, the video signal recorded in the video RAM 32 is also read out and recorded in the PCM audio area in the same manner as in the case of recording the video signal of still image #n+2 in the above-described still image continuous shooting mode. .

That is, even in this one-shot still image shooting mode, the positions at which video signal recording ends can be matched in the PCM audio area and the video area, and continuous shooting can be performed. Further, even if the VTR is removed from the subject immediately after operating the record key, it is possible to prevent a video signal of the subject not intended by the photographer from being recorded.

It should be noted that the present invention is not limited to the above-described embodiments; for example, a so-called deep recording method in which the recording area is divided in the thickness direction of the magnetic tape is adopted, and analog video signals and digital signals are It goes without saying that the present invention can be applied to a video tape recorder and the like that can record in each area and reproduce the recorded analog video signal and digital signal.

[0058]

As is clear from the above description, in the present invention, one field or one frame of an input video signal, for example, a video signal from an image sensor, is converted into a video signal for one still image (digital video signal). ) as P of magnetic tape
When recording in the CM audio area, the video signal from the image sensor is recorded in the video area as a moving image video signal (analog video signal). Then, the recording operation of the still image video signal is stopped by a control signal to stop recording, and
The video signal from the image sensor is stored in the memory by this control signal to stop recording, and the memory is stored in memory from the time the control signal to stop recording is received until the recording of the video signal for one still image is completed. By repeatedly reading out the video signal stored in the memory and recording it in the video area, the video signal can be read out repeatedly and recorded in the video area. In other words, it is possible to record a video signal without interruption, that is, it is possible to perform continuous shooting, and it is possible to prevent a video signal of a moving image that is not intended by the photographer from being recorded in this video area.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing the circuit configuration of a camera-integrated 8 mm video tape recorder to which the present invention is applied.

FIG. 2 is a diagram schematically showing a recording format of a video signal on a magnetic tape.

FIG. 3 is a diagram showing a time chart for explaining the operation of a simultaneous video and still image shooting mode.

FIG. 4 is a block circuit diagram showing a specific circuit configuration of a signal processing circuit that performs fade-out.

FIG. 5 is a diagram showing a time chart for explaining the operation of the signal processing circuit that performs the fade-out.

FIG. 6 is a diagram showing a tape format of magnetic tape used in an 8 mm video tape recorder.

[Explanation of symbols]

1...Magnetic tape 10...Camera part 20...Movie video signal processing section 22...Video RAM 30...Still image video signal processing section 52...System controller

Claims (1)

[Claims] 1. Each track on a magnetic tape formed by helical scanning is divided into a first area and a second area, an analog video signal is recorded in the first area, and an analog video signal is recorded in the second area. In a video signal recording and reproducing apparatus that records a digital signal and reproduces the recorded analog video signal and digital signal, at least one of the video signals is
a memory having a storage capacity for one field or one frame and storing an input video signal; and a first memory for recording a video signal read from the memory or the input video signal as a video signal of a moving image in the first area. a recording means;
a second recording means for converting the input video signal into a digital video signal and recording one field or one frame of the digital video signal in the second area as a video signal for one still image; A control signal for controlling the stop of the operation of the second recording means and writing in the memory is outputted, and after outputting the control signal, the second recording means records a video signal for one still image. A control means for controlling the first recording means to read and record the video signal stored in the memory according to the control signal, and a control means for controlling the analog video signal recorded in the first area until the completion of A video characterized in that it is provided with a first reproducing means for reproducing the digital video signal recorded in the second area as a video signal of a moving image, and a second reproducing means for reproducing the digital video signal recorded in the second area as a video signal of a still image. Signal recording and reproducing device.