JP2956205B2 - Still image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to a still picture recording apparatus, and more particularly to a still picture recording apparatus, for example, a so-called PCM audio area of a magnetic tape used in a so-called 8 mm video tape recorder (hereinafter referred to as 8 mm VTR). The present invention relates to a still image recording device that records an image as a digital video signal.

B. Summary of the Invention A still image recording apparatus according to the present invention is a still image recording apparatus that records a still image as a digital video signal on a track on a magnetic tape formed by helical scanning, and has a track for tracking servo. Tracking signal recording means for recording a tracking signal; data recording means for recording a digital video signal on a track; and recording of a digital video signal on a track by the data recording means. Control means for controlling the tracking signal recording means and the data recording means so that only the tracking signal is recorded in at least one of the areas, so that the tracking signal is recorded before and after the area where the digital video signal of the still image is recorded. An area in which only the information is recorded is provided. Then, for example, when reproducing a still image, stabilize the tracking servo in an area where only the tracking signal is recorded,
At the time when the so-called rotary head scans the area where the still image is recorded, accurate tracking servo control is operating,
In addition to enabling stable playback of still images, inserting new still images or deleting unnecessary still images affects digital video signals of other recorded still images. It is something that has never happened.

C. Prior Art As a device for recording a video signal on a recording medium, for example, a magnetic recording medium, for example, a so-called electronic still camera using a so-called still video floppy, a so-called video tape recorder using a magnetic tape, and the like are known. .

Specifically, for example, in a so-called 8 mm video tape recorder (hereinafter referred to as 8 mm VTR), a magnetic tape is wound around a so-called rotary head drum at an angle of 211 degrees, and a pair of heads at 180-degree intervals (hereinafter referred to as a rotary head) Performs a helical scan on the magnetic tape, thereby forming an oblique track 71 on the magnetic tape 70, as shown in FIG.
Then, the luminance signal is FM-modulated, the carrier chrominance signal is converted to a low frequency, the audio signal is FM-modulated, and the tracking signal for tracking servo is applied to a video area 72 corresponding to 180 degrees of the rotating head drum of each track 71. A signal such as a pilot signal for so-called ATF (Automatic Track Finding) control is frequency-multiplexed and recorded. In a PCM audio area 73 corresponding to about 30 degrees of the remaining rotating head drum of each track 71, a non-linearly quantized 8-bit / sample digital audio signal is provided with a so-called cross interleave code for error correction. After the processing, a synchronization signal, parity, ID, etc. are added and recorded. The cue track 74 and the audio track 75 are formed on both sides of the magnetic tape 70 by scanning with the fixed head. The cue track 74 records a cue signal used for, for example, an address of a recorded content or a head, and the audio track 75 records, for example, after-recording (after record in).
g) audio signal is recorded.

By the way, as disclosed in, for example, JP-A-58-164383, a title, a cast, a description, and the like are superimposed on a moving image recorded in the video area 72 so as to be displayed (superimposed). There is known a technique of capturing a still image such as information and recording (after-recording) in the PCM audio area 73.

As a device for recording a still image, the above-mentioned electronic still camera is generally known.
When used as a still image recording apparatus for recording a still image as a digital video signal in the PCM audio area, a single still image, that is, a digital video signal for one field or one frame is recorded, for example, as shown in FIG. As shown, an area 76 of several tens to several hundred tracks is required.
Further, as a recording mode of a still image, as shown in FIG. 6, a still image # 1, # 2, # 3,... Is recorded continuously, and for example, as shown in FIG. An area 77 in which nothing is recorded (hereinafter referred to as an idle area) is provided between the areas 76 in which still images are recorded, and the still images # 1, # 2, # 3,
.. Are recorded.

D. Problems to be Solved by the Invention By the way, when a still image is continuously recorded as shown in FIG. 6, ATF control is performed using the pilot signal recorded together with the digital video signal as described above. Still images # 1, # 2, #
Can be reproduced stably, but if an idle area 77 is provided between adjacent still images as shown in FIG. 7, pilot signals can be obtained from the idle area 77. And ATF control cannot be performed. Therefore,
At the time when the rotating head starts scanning the area 76 on which the still image is recorded, there is a problem that the ATF control is not stable and the still image cannot be reproduced.

The 8 mm VTR has a standard recording / reproducing mode (hereinafter, referred to as SP mode) and a long-time recording / reproducing mode (hereinafter, referred to as LP mode), and the track pitch in each mode is defined as 20.5 μm and 10.2 μm, respectively. Therefore,
For example, 2ch rotary head with 15μm width or 4ch with 13μm width
When SP mode recording is performed using a rotating head, so-called guard bands of about 5.5 μm and about 7.5 μm are formed, respectively. On the other hand, when performing the recording in the LP mode, the rotating heads are adjacent to each other so as to conform to the prescribed track pitch (10.2 μm), that is, to reduce the track pitch formed for the head width (15 μm or 13 μm). A so-called overlap recording method of scanning (overlapping) a part of the track to be scanned is adopted.

Therefore, for example, as shown in FIG. 8, in the LP mode (track pitch = 10.2 μm), a still image as shown in FIG. 6 is continuously produced using a 2-channel rotating head (head width = 15 μm). When a new still image #i is inserted (inserted) into the recorded magnetic tape 70, about 5 (# 15) of the first track 71 of the area 76 of the already recorded still image (hereinafter referred to as a recorded still image) # i + 1 -10.2) μm, a new digital video signal is recorded. As a result, the digital video signal of the recorded still image # i + 1 cannot be correctly reproduced. FIG. 8 shows a state where the tracking servo control is performed so that the left end of the rotary head 81 coincides with the left end of the track 71. For example, the center of the rotary head is coincident with the center of the track. When the tracking servo control is performed, the rotary head overlaps and scans the area of the recorded still image # i-1 before the area where the new still image #i is inserted. The i-1 digital video signal cannot be correctly reproduced.

Further, as shown in FIG. 9, for example, in the SP mode (track pitch = 20.5 μm), a so-called flying erase head 82 having a width of, for example, 40 μm is used to continuously generate a still image as shown in FIG. When an arbitrary still image #i is erased from the magnetic tape 70 recorded by
The first track 71 of the area 76 where the next still image # i + 1 is recorded is also erased. As a result, the digital video signal of the recorded still image # i + 1 cannot be correctly reproduced.

The present invention has been made in view of such circumstances, and for example, when reproducing a still image, tracking is performed in an area where only a tracking signal provided in front of an area where a still image is recorded is recorded. The servo is stabilized, and when the rotating head scans the area where the still image is recorded, accurate tracking servo control is performed so that the still image can be reproduced stably and a new still image can be reproduced. It is an object of the present invention to provide a still image recording apparatus which does not affect a digital video signal of another recorded still image when inserted between recorded still images or when an unnecessary still image is deleted.

E. Means for Solving the Problems In the present invention, in order to solve the above problems, a still image recording device that records a still image as a digital video signal on a track on a magnetic tape formed by helical scanning, Tracking signal recording means for recording a tracking signal for tracking servo on the track; data recording means for recording a digital video signal on the track; and digital data when the digital video signal is recorded on the track by the data recording means. It is characterized by having a control means for controlling the tracking signal recording means and the data recording means so as to record only the tracking signal in at least one of the areas before and after the area where the video signal is recorded.

F. Function In the still picture recording apparatus according to the present invention, only the tracking signal is recorded in at least one of the areas before and after the area where the digital video signal of the still picture is recorded. Then, for example, when a still image is reproduced, the tracking servo can be stabilized in an area where only the tracking signal is recorded. For example, when inserting a new still image or deleting an unnecessary still image,
Do not affect other recorded still images.

G. Embodiment Hereinafter, an embodiment of the still image recording apparatus according to the present invention will be described with reference to the drawings.

In this embodiment, the present invention is applied to a so-called camera-integrated 8 mm VTR (hereinafter simply referred to as VTR), and FIG. 1 is a block circuit diagram showing a circuit configuration of the VTR.

As shown in FIG. 1, the VTR includes a camera unit 10 that converts an image pickup signal into a digital video signal and performs signal processing such as so-called knee and gamma processing.
A video signal processor 20 converts a digital video signal from the digital video signal into an analog video signal and supplies the analog video signal to the head unit 40, and reproduces an analog video signal based on, for example, the so-called NTSC system from the reproduced RF signal from the head unit 40. And performing data compression processing or the like on one field or one frame of the digital video signal from the camera unit 10,
And a still image video signal processing unit for reproducing a digital video signal from the reproduced RF signal from the head unit 40.
30, the analog video signal from the moving picture video signal processing unit 20 and the digital video signal from the still picture video signal processing unit 30 are time-division multiplexed and
It comprises the above-mentioned head unit 40 for recording in the audio area and reproducing the reproduced RF signal, and the control unit 50 for controlling the above-mentioned still image / video signal processing unit 30 and the like.

The magnetic tape 1 has a tape format similar to that of the magnetic tape 70 shown in FIG. 5, for example. That is, the track formed obliquely on the magnetic tape 1 by the helical scanning of the rotary head 45 of the head unit 40 is divided into a video area and a PCM audio area,
Moving images are recorded as analog video signals in the video area,
Still images are recorded as digital video signals in the PCM audio area.

The camera unit 10 samples a CCD image sensor (hereinafter, referred to as a CCD) 11 and an image pickup signal from the CCD 11 at a predetermined cycle, and a so-called AGC (Automatic Gain Control).
l) an S / H & AGC circuit 12, an analog / digital (hereinafter A / D) converter 13 for converting a sampled video signal from the S / H & AGC circuit 12 into a digital signal,
And a camera process circuit 14 for subjecting the video signal converted to the digital signal to signal processing such as knee and gamma processing as described above.

The video image signal processing unit 20 converts the video signal from the camera unit 10 into a video signal compliant with the NTSC system, FM-modulates the luminance signal with a predetermined carrier, and converts the carrier chrominance signal into a low-frequency signal. A video processing circuit 21 for frequency-multiplexing these signals (hereinafter, this frequency-multiplexed signal is referred to as moving image data) and, conversely, reproducing a video signal from the moving image data; A D / A converter 23 for converting a video signal (digital signal) compliant with the NTSC system supplied from the still picture video processing circuit 31 of the processing unit 30 via the changeover switch 22 into an analog signal; It is composed of a D / A converter 24 for converting to an image signal, and an A / D converter 25 for converting an analog image signal obtained as a reproduction RF signal from the head unit 40 into moving image data. .

The still image video signal processing unit 30 performs a predetermined data compression process on the video RAM 32 that stores the video signal from the camera unit 10 or the like for one field or one frame, and the video signal read from the video RAM 32. (Hereinafter, the compressed video signal is referred to as compressed data). Conversely, the still image video processing circuit 31 for performing data decompression processing on the compressed data to reproduce the video signal, the RAM 34 for storing the compressed data, A synchronization signal, an error correction code, and an ID from the control unit 50 are added to the compressed data (hereinafter, the compressed data to which the ID and the like are added is referred to as still image data), and the ID is separated from the still image data. And a PCM process circuit 33 for detection.

By the way, the above-mentioned predetermined data compression process uses, for example, a strong correlation between video signals in space and time. When an image is divided into blocks, the dynamic range of the video signal included in each block is determined by local correlation. Smaller. Therefore, adaptive dynamic range coding (ADRC: Adaptive Dyanmic Range Coding) that allocates the number of bits according to the dynamic range of each block is used.

The head unit 40 time-division multiplexes the analog video signal (analog video signal obtained by converting the video data) from the video video signal processing unit 20 and the digital video signal (still image data) from the still video signal processing unit 30. As well as terminal 46
Signal for tracking servo control, supplied via an external device, for example, a so-called ATF (Automatic Track Findin).
g) MUX41 for superimposing a pilot signal for control, and MUX4
An amplifier 43 for amplifying the time-division multiplexed recording signal from 1 and supplying an exciting current to the rotary head 45, an amplifier 44 for amplifying the reproduced RF signal from the rotary head 45, the amplifier 43 and the amplifier 44 And a changeover switch 42 for switching between during recording and during reproduction.

The control unit 50 controls the operation mode of the VTR, such as a still image shooting / playback mode and a moving image shooting / playback mode, and generates an ID for identifying a track on which still image data is recorded. A system controller 52,
A memory controller 53 for controlling the address and the like of the video RAM 32; and detecting the envelope of the reproduced RF signal to determine whether or not the still image data has already been recorded. And an ATF circuit 55 that performs ATF control, detects tape speed, and supplies tape speed information to the system controller 52. It is composed of

Next, the operation of the VTR having the following configuration will be described.

For example, in a still image shooting mode, operating a shutter (not shown) records a still image in the PCM audio area of the magnetic tape 1.

That is, when the system controller 52 sets, for example, a mode for capturing a still image on an operation panel (not shown), the system controller 52 detects a control signal corresponding to the setting and controls each unit to operate in the still image capturing mode. I do. For example, when the shutter is operated, a shutter signal transmitted from the shutter via the terminal 51 is detected, and the camera unit is operated.
One frame or one field of the video signal photographed at 10 is recorded as a digital video signal in the PCM audio area of the magnetic tape 1 via the still picture video signal processing unit 30 and the head unit 40, and the digital video signal is recorded. Only the pilot signal is recorded in an area before and after the area where the signal is recorded.

Specifically, when the still image capturing mode is set, the system controller 52 first controls a motor (not shown) that drives the magnetic tape 1 to rewind the magnetic tape 1 by a predetermined length. Thereafter, the respective parts are controlled so as to reproduce the rewinded area of the magnetic tape 1. At this time, the envelope detection circuit 54 detects the envelope of the reproduced RF signal supplied from the rotary head 45 via the amplifier 44, and determines whether the still image data has already been recorded in the PCM audio area of the magnetic tape 1. Is determined, and the presence / absence information of the recorded still image is supplied to the system controller 52. The ATF circuit 55 performs ATF control during the reproducing operation, detects the tape speed at that time, and supplies the tape speed information to the system controller 52.

Next, when the shutter is operated, the system controller 52 sets an area for recording a still image based on the recorded still image presence / absence information, the tape speed information, and the tape speed information newly set on the operation panel. Each part is controlled so that an area in which only a pilot signal is recorded is provided before and after the step (a), and still image data is recorded.

That is, the imaging signal from the CCD 11 is transmitted to the S / H & AGC circuit 1
2. After being converted into a digital signal in the A / D converter 13 and the camera process circuit 14, signal processing such as knee and gamma processing is performed. The video signal subjected to this signal processing is supplied to a video processing circuit 21 and a still image video processing circuit 31.
Is supplied to the video RAM 32 via the.

When the shutter is operated, the system controller 52 controls the motor for moving the magnetic tape 1 so that the magnetic tape 1 starts running, and the video signal from the camera process circuit 14 is stored in the video RAM 32. The memory controller 53 is controlled in such a manner that Video RAM3
2 sequentially stores one field or one frame of a video signal by a write address synchronized with, for example, line-sequential scanning of the CCD 11 from the memory controller 53.

Next, the system controller 52 controls the memory controller 53 so that a video signal stored in the video RAM 32 is read out after a predetermined time has elapsed since the shutter was operated, that is, after the rotary head 45 scans a predetermined number of tracks. Control. Video RAM 32 is a memory controller 5
The video signal is sequentially read out from the read address 3 and synchronized with the data compression processing or the like, for example, and supplied to the still image video processing circuit 31. Still image video processing circuit 31
Performs a compression process on the sequentially read video signal to generate compressed data, and supplies the compressed data to the PCM process circuit 33.

After temporarily storing the compressed data in the RAM 34, the PCM process circuit 33 sequentially reads out the compressed data from the RAM 34, and outputs a synchronization signal, an error correction code, and a system controller 52.
The still image data is generated by adding an ID for identifying the track on which the still image data supplied from the server is recorded, and the still image data is supplied to the MUX 41.

On the other hand, the video process circuit 21 is a camera process circuit.
The video signal from 14 is converted into a video signal conforming to, for example, the NTSC system, and supplied to a D / A converter 23 via a changeover switch 22. The D / A converter 23 converts a video signal (digital signal) compliant with the NTSC system into an analog signal, and sends out the analog signal via a terminal 26 to, for example, a monitor receiver. As a result, the image being photographed can be monitored. The video process circuit 21 may also be provided with a luminance signal from the camera process circuit 14 when necessary, for example, when recording a moving image captured while recording a still image in the video area of the magnetic tape 1. The color signal is frequency-multiplexed to generate moving image data, and the moving image data is supplied to the D / A converter 24. The D / A converter 24 converts the video data into an analog video signal and
Supply 1

The MUX 41 is a moving image video signal from the D / A converter 24, that is, an analog video signal obtained by converting the above moving image data into an analog signal, and a still image video signal from the PCM process circuit 33, that is, the above still image data Are time-division multiplexed, a pilot signal for ATF control supplied via a terminal 46 is superimposed, and supplied to a rotary head 45 via a changeover switch 42 and an amplifier 43.

Next, after reading of the video signal for one field or one frame from the video RAM 32 has been completed, the system controller 52 waits for a predetermined time to elapse before the magnetic tape 1 is read.
The motor for moving the magnetic tape 1 is controlled so as to stop the scanning of.

In this manner, only the pilot signal is recorded in the PCM audio area of the magnetic tape 1 for a predetermined time from when the shutter is operated to when the reading of the video signal from the video RAM 32 is started. Is read out, still image data is recorded, and only a pilot signal is recorded again for a predetermined time from when the reading of the video signal from the video RAM 32 is completed to when the running of the magnetic tape 1 is stopped.

That is, by repeating the above operation, for example, as shown in FIG. 2, the still images # 1 and # 2 are stored in the area 5 of the tens to hundreds of tracks of the PCM audio area 3 of the magnetic tape 1.
Are recorded together with IDs for identifying tracks on which still images are recorded, and still images # 1, # 2, # 3,.
Areas 6 and 7 where only the pilot signal is recorded before and after the area 5 where... Are recorded, that is, where no still image data is recorded are formed. In addition, if necessary, an analog video signal of a moving image taken while a still image is being recorded is recorded in an area of a video area 2 corresponding to an area 5 of the magnetic tape 1 where a still image is recorded. Incidentally, the number of tracks required to record one still image depends on the data compression ratio. When a still image is recorded in the PCM audio area 3 and only a pilot signal is recorded in the video area 2, the operation of the moving image signal processing unit 20 is stopped.

Thus, in the present embodiment, the MUX 41 to the rotating head 45 are used as tracking signal recording means, the still image video processing circuit 31 to the RAM 33 and the MUX 41 to the rotating head 45 are used as data recording means, and the system controller 52 is used as the control means. Used.

Here, a specific example of the control operation of the system controller 52 in the one-shot shooting mode in which one still image is shot each time the shutter is operated will be described with reference to the flowchart shown in FIG. 3 and FIG.

As shown in FIG. 3, when the one-shot shooting mode is set in step ST1, the system controller 52 sets each unit to operate in the one-shot shooting mode, and proceeds to step ST2.

In step ST2, the system controller 52
For example, as shown in FIG. 4, a motor for moving the magnetic tape 1 so as to rewind the magnetic tape 1 by a predetermined length (hereinafter simply referred to as a motor) is controlled, and the process proceeds to step ST3.

In step ST3, the system controller 52
As shown in FIG. 4, the motor is controlled to stop when the magnetic tape 1 has been rewound by a predetermined length, and the step ST
Proceed to 4.

In step ST4, the system controller 52
As shown in FIG. 4, the respective parts are controlled so as to start the reproduction operation of the rewinded area 8 of the PCM audio area 3 of the magnetic tape 1, and the process proceeds to step ST5.

In step ST5, the system controller 52
At the time of reproduction of the rewinded area 8 shown in FIG. 4, the envelope detection circuit 54 is controlled so as to detect the envelope of the reproduced RF signal and to output the presence / absence information of the recorded still image. When a still image is recorded, the tape speed at the time of recording of the rewinded area 8 is detected and the tape speed information is output.
The ATF circuit 55 is controlled, and the process proceeds to step ST6.

In step ST6, the system controller 52
The presence / absence information of the recorded still image from the envelope detection circuit 54 is compared, and if a still image is already recorded in the rewinded area 8 shown in FIG. 4, the process proceeds to step ST7, where the still image is recorded. If not, the process proceeds to step ST9.

In step ST7, the system controller 52
The tape speed information of the recorded still image in the rewinded area 8 from the TF circuit 55 and the tape speed information at the time of recording a new still image set on the operation panel are determined. The process proceeds to ST8, and if the tape speed is different, proceeds to step ST9.

In step ST8, the system controller 52
As shown in FIG. 4, an area (hereinafter referred to as a front gap) 6 in which only a pilot signal provided in front of a still image to be newly recorded is set to, for example, two tracks, and is provided behind a still image to be newly recorded. An area (hereinafter referred to as a rear gap) 7 in which only the pilot signal is recorded is, for example, one track, and the process proceeds to step ST10.

On the other hand, in step ST9, the system controller 5
In step 2, the front gap 6 is set to, for example, 120 tracks and the rear gap 7 is set to one track, and the process proceeds to step ST10.

That is, when the tape speeds of the adjacent still images are the same at the time of reproduction, the tracking servo control only needs to maintain the previous state between the two still images. Shorter,
When the tape speeds of the adjacent still images are different, it is necessary to shift the tracking servo control to a state corresponding to the new tape speed at the time when the tape speed changes. That is why.

In step ST10, the system controller 52
As shown in FIG. 4, the motor is controlled so that the running of the magnetic tape 1 is stopped, and a recording pause state, that is, a state in which recording can be started when the shutter is operated, is entered, and the process proceeds to step ST11.

In step ST11, the system controller 52
Determine whether the shutter has been operated based on the shutter signal,
If so, the process proceeds to step ST12; otherwise, the process stands by in step ST11.

In step ST12, the system controller 52
The memory controller 53 is controlled so that one field or one frame of the video signal from the camera unit 10 is stored in the video RAM 32, and the motor is controlled so that the magnetic tape 1 starts running, and the process proceeds to step ST13. As a result, the pilot signal supplied via the terminal 46 shown in FIG. 1 is recorded in the front gap 6 having the length set in the above-mentioned step ST8 or ST9. That is,
In the front gap 6, only the pilot signal is recorded.

In step ST13, the system controller 52
A video signal (hereinafter referred to as image data) is read from the video RAM 32, and as shown in FIG. 4, the image data is stored in the PCM audio area 3 of the magnetic tape 1, for example, in the area 5 for 144 tracks. The memory controller 53 is controlled, and the process proceeds to step ST14.

In step ST14, the system controller 52
After the recording of the image data is completed, the motor is controlled so that the running of the magnetic tape 1 continues for a predetermined length.
Proceed to 15. As a result, as shown in FIG. 4, the pilot signal is recorded in the rear gap (for one track) 7 set in step ST8 or ST9 described above. That is, only the pilot signal is recorded in the rear gap 7.

In step ST15, the system controller 52
As shown in FIG. 4, the state shifts to the recording pause state. That is, it waits until the next shutter is operated or the one-shot shooting mode is canceled by the operation panel. Then, when the shutter is operated, step ST is performed again.
Start the operation from 12. The process ends when the one-shot mode is released.

For example, a track number recorded at the beginning of each track may be used as an ID so that the gaps 6 and 7 and the area 5 in which image data is recorded can be easily identified at the time of reproduction. Specifically, the track numbers of the front gap 6 and the rear gap 7 are expressed as “00000000” in binary notation.
The track numbers of the area 5 where the image data is recorded are “00000001” to “11111111” in order from the first track.

Further, for example, in the still image continuous shooting mode for continuously shooting still images, the VTR does not have the recording pause state of step ST15 shown in FIG. ~ Repeat step ST14,
While providing a front gap and a rear gap respectively,
Still image data is recorded continuously.

Next, a description will be given of a still image playback mode in which a still image is played back from a magnetic tape on which image data, that is, still image data is recorded with gaps provided before and after as described above.

For example, when the operation panel is set to the still image reproduction mode on the operation panel, the system controller 52 detects a control signal corresponding to the setting and controls each unit to operate in the still image reproduction mode.

Specifically, as shown in FIG. 1, the system controller 52 controls the motor to start running the magnetic tape 1 in order to reproduce the still image data recorded in the PCM audio area of the magnetic tape 1. I do. At this time, the ATF circuit 55 also applies A to the front gap and the rear gap.
Since pilot signals for TF control are recorded, ATF control, that is, tracking servo control is performed using these pilot signals and pilot signals recorded together with still image data. When the tracking servo control operates normally, the PCM process circuit 33 separates and detects a synchronization signal, an ID, and the like from the still image data reproduced by the head unit 40 from the PCM audio area of the magnetic tape 1,
The detected ID is supplied to the system controller 52.

The system controller 52 controls the rotating head based on the ID
45 determines whether the track currently being scanned is a track on which still image data is recorded. For example, when the track number is used as the ID as described above, when the track number is detected as "00000000", the track is a track of the front gap or the rear gap, and the track number is set to "00000001" to "11111111". If detected, it is determined that the track is a track on which still image data is recorded. If the track scanned by the rotary head 45 is a track on which still image data is recorded, error correction is performed on the still image data, and the error-corrected compressed data is temporarily stored in the RAM 34. Control as follows. Instead of using the track number to determine the track currently being scanned by the rotary head 45, the presence / absence information of the still image data detected by the envelope detection circuit 54 may be used as the ID.

Then, the compressed data read from the RAM 34 is supplied to the still image video processing circuit 31. The still image video processing circuit 31 performs a data decompression process on the compressed data to reproduce a video signal and supplies the video signal to the video RAM 32.

The video signal stored in the video RAM 32 is repeatedly read out by the read address synchronized with the NTSC system synchronization signal from the memory controller 53 when the video signal is stored in the video RAM 32 for one field or one frame. It is supplied to the still picture video processing circuit 31. The still image video process circuit 31 converts the video signal into a video signal conforming to the NTSC system, and then sends the video signal to the monitor receiver via the changeover switch 22, the D / A converter 23, and the terminal 26.
As a result, the still image recorded in the PCM audio area of the magnetic tape 1 is displayed on the monitor receiver.

By the way, for example, when a new still image is inserted (inserted) into an area where a still image is already recorded (hereinafter referred to as a recorded still image area) and recorded, as described in the related art, When a still image is recorded by the overlap recording, the track pitch formed with respect to the width of the rotating head is narrow, and a new track is added to a part of the first track or the last track of the recorded still image area. The still image data of the still image is recorded, and the still image data of the previously recorded still image cannot be reproduced correctly. However, as in the present embodiment, before and after the area where the still image is recorded, By providing the gap, the last track of the front gap or the first track of the rear gap is overlapped, but the area where the still image data is recorded is not affected at all. It is possible to be without, to play a still image of the front and rear of the still image that you insert also correctly.

Further, even when erasing unnecessary still image data of a still image using a flying erase head of about twice the track pitch, the front gap is equivalent to two tracks and the rear track is equivalent to one track as in this embodiment. By doing so, there is no effect on the still image data of the still images before and after the erased still image, and the still images before and after can be correctly reproduced.

Further, as described above, by recording the pilot signal in the front gap and the rear gap, the tracking servo control can be operated stably in these gaps. Further, even when the tape speed changes between two still images, the rotating head starts scanning the area where the rear still image is recorded by increasing the front gap of the rear still image as described above. At this point, the tracking servo control can be operated stably.

It is needless to say that the VTR according to the present embodiment can record a moving image or reproduce the recorded moving image by setting the recording mode of the moving image or the reproduction mode of the moving image on the operation panel.

VTR that performs tracking servo by CTL signal
Needless to say, this is also applicable.

H. Effects of the Invention As is clear from the above description, according to the present invention, when a data recording unit records a still image as a digital video signal on a track on a magnetic tape, the data before and after the area where the still image is recorded is recorded. By recording a tracking signal in at least one of the areas by the tracking signal recording means, for example, when reproducing a still image, an area in which only the tracking signal provided in front of the area where the still image is recorded is recorded In this case, the tracking servo can be stabilized, and accurate tracking servo control can be performed when the rotary head operates the area where the still image is recorded, so that the still image can be stably reproduced. In addition, when a new still image is inserted between recorded still images or when an unnecessary still image is deleted, the digital video signal of another recorded still image can be prevented from being affected. .

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a circuit configuration of a camera-integrated 8 mm video tape recorder (hereinafter referred to as a VTR) to which the present invention is applied. FIG. 2 shows a specific example of a recording form of a magnetic tape used in the VTR. FIG. 3 shows the above.
FIG. 4 is a flowchart for explaining the operation of the VTR in the one-shot shooting mode, and FIG. 4 is a diagram showing the recording form of the magnetic tape and the time course of the operation for explaining the operation of the VTR in the one-shot shooting mode. FIG. 5 is a diagram showing a tape format of a magnetic tape used in an 8 mm video tape recorder, FIG. 6 is a diagram showing a first recording mode example of the magnetic tape shown in FIG. Fig. 7 shows the fifth
FIG. 8 is a diagram showing a second recording mode example of the magnetic tape shown in FIG. 8, FIG. 8 is a diagram showing the relationship between the width of the rotating head and the track pitch, and FIG. 9 is a diagram showing the width of the flying erase head and the track; FIG. 4 is a diagram illustrating a relationship between pitches. 1 Magnetic tape 31 Still image video processing circuit 32 Video RAM 33 PCM processing circuit 41 MUX 45 Rotating head 52 System controller 53 Memory controller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 5/782-5/783 H04N 5/91-5/956

Claims (1)

(57) [Claims] 1. A still picture recording apparatus for recording a still picture as a digital video signal on a track on a magnetic tape formed by helical scanning, and a tracking signal recording means for recording a tracking signal for tracking servo on said track. Data recording means for recording a digital video signal on the track; and when recording the digital video signal on the track by the data recording means, at least one of an area before and after an area where the digital video signal is recorded. And a control means for controlling the tracking signal recording means and the data recording means so as to record only the tracking signal.