JPH09266563A - Audio / video data recording / reproducing apparatus and method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent generation of noise and the like when reproducing audio / video data recorded by a simple, compact and lightweight recording / reproducing apparatus. SOLUTION: Identification data is added to the head of audio / video data to be continuously recorded and newly recorded on a VTR tape 2.
The system control circuit 60 stops the output of the audio data reproduced from the VTR tape 2 immediately after the recording start point and invalidates it based on the identification data separated from the reproduced audio / video data, and starts recording. VTR tape 2 immediately after the point
The video data reproduced from is replaced with the audio / video data of the frame normally reproduced from before the recording start point to the end, and the freeze process is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple audio / video data recording / reproducing apparatus and method for overwriting new digital audio / video data on a tape recording medium without having an erasing head on a drum.

[0002]

2. Description of the Related Art A digital voice recorded / photographed is integrally formed with a camera.
A compact and lightweight audio / video data recording / playback device that records video data on the spot on a tape recording medium such as a video tape (hereinafter referred to as "cam-corder (camera recorde)".
r) ”) is widely distributed in the market. Such a camcorder generally has a "continuous shooting function" for continuously recording audio / video data of newly recorded / photographed audio / video on audio / video data recorded on a video tape before that.

On the other hand, a compact and lightweight camcorder is required to reduce the size of the drum, the weight of the device and the power consumption.
Erase head on drum (Flying erase head; fl
Often has no aying erase head). Therefore, in a camcorder that does not have such a flying erase head, a fixed erasing head erases the audio / video data already recorded on the video tape, and
Video data will be recorded.

However, when the data on the video tape is erased by the fixed head, the audio / video data (base data) already recorded before and after the head (recording start point) of the newly recorded audio / video data is erased. I can't. In other words, immediately before the recording start point, the background data remains recorded on the video tape even after the new audio / video data (top data) is recorded, and immediately after the recording start point, the background data is recorded. The ground data is overwritten.

Furthermore, recording of audio / video data on a video tape is performed by an azimuth recording system in which the azimuth angle is reversed for each helical track. Therefore,
When the azimuth angle of the land data immediately after the recording start point and the azimuth angle of the background data immediately before the recording start point match, audio and video data are mixed and played from the helical tracks immediately before and immediately after the recording start point. It becomes a voice,
The error correction may not be possible even by the error correction code added to the video data. Further, immediately after the recording start point, if the background data is overwritten on the background data, the background data may not be sufficiently erased, and the background data and the background data may be mixed and reproduced. Even in such a case, it may be impossible to correct the error of the upper ground data.
When such a situation occurs, noise is generated in the audio / video data reproduced from the boundary between the upper ground data and the ground data,
The quality deteriorates.

The present invention has been made in view of the above-mentioned problems of the prior art. For example, a voice that is continuously shot and recorded using a camcorder that is integrally formed with a camera and does not have a flying erase head is recorded. It is an object of the present invention to provide an audio / video data recording / reproducing apparatus and method in which noise or the like does not occur in audio / video obtained from a video tape at a boundary portion between upper ground data and ground data when reproducing the video data. To aim. The present invention also provides an audio / video data recording / reproducing apparatus capable of reproducing high-quality audio / video data from a video tape at a boundary portion between upper ground data and background data obtained by continuous shooting. To aim.

[0007]

In order to achieve the above object, an audio / video data recording / reproducing apparatus according to the present invention provides audio / video data including audio data and video data in units of one frame or a plurality of frames. A data dividing unit that divides into a predetermined recording unit in units, each of the divided recording units of the audio / video data, and at least the divided recording unit of the audio / video data are in the first frame of the audio / video data. Recording packet generating means for generating a predetermined recording packet by multiplexing position data indicating whether or not included, recording means for recording the generated recording packet on a tape recording medium, and recording on the tape recording medium. Reproducing means for reproducing the recording packet, recording unit of the audio / video data from the reproduced recording packet, and the position data Separating means for separating the separated position data, audio data invalidating means for invalidating the audio data included in this recording packet when the separated position data is included in the first frame, and the separated position data And a video data output means for outputting the video data of the frame reproduced immediately before this recording packet when it is included in the first frame.

In the audio / video data recording / reproducing apparatus according to the present invention, the data dividing means is a GOP (composed of compressed audio / video data for one frame (frame unit) or several frames according to, for example, the MPEG system. gro
The audio / video data, which is compression-encoded in units of up of pictures and to which the error correction code is added, is divided into recording units suitable for recording on a helical track of a tape recording medium such as a video tape.

The recording packet generation means is for dividing the voice
The recording unit of the video data includes the header of the recording packet, the synchronization data, and the position data indicating whether the recording unit of the audio / video data included in the same recording packet is included in the head GOP of the land data. Are multiplexed and a recording packet is generated. The recording means records the recording packet in GOP units over a plurality of helical tracks of the tape recording medium.

The reproducing means reproduces a recording packet from the helical track of the tape recording medium in GOP units. The separating means separates the audio / video data, the position data, and the error correction code from the reproduced recording packet in units of GOP.

The voice invalidation means uses the G at the beginning of the landing data.
The audio data of the OP is invalidated (mute), error correction cannot be performed due to the influence of the background data immediately before and immediately after the recording start point, and the audio data of the land data that could not be reproduced normally is stopped and output to the outside. Prevents noise from being mixed into the voice that is played. The video data output means cannot correct errors due to the influence of the background data immediately before and immediately after the recording start point,
Instead of the video of the landing data that could not be played normally,
An image of the background data immediately before the recording start point that can be normally reproduced is output, and an image of the upper ground data immediately after the recording start point where the image quality has deteriorated is prevented from being output to the outside.

Further, the audio / video data recording / reproducing method according to the present invention is such that audio / video is recorded in one frame unit or a plurality of frame units on a tape recording medium on which other audio / video data may be already recorded. Data and the voice
The position data indicating the start position of the video data is overwritten and recorded, and the audio / video data and the position data overwritten and recorded on the tape recording medium are reproduced, and the reproduced position data is the start. Is invalidated, and the video data of the frame of the audio / video data indicating that the reproduced position data is the head is replaced with the other audio / video data.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below. FIG. 1 is a diagram showing the configuration of a recording / reproducing apparatus 1 according to the present invention. As shown in FIG. 1, the recording / reproducing apparatus 1 according to the present invention includes a drum 30 and a system control circuit 6.
0, tape running system 62, drum rotating system 64, camera unit 6
6, fixed erasing head (ERASE HEAD) 70, erasing control circuit 7
2, the recording unit 10 and the reproducing unit 48.

The recording unit 10 includes a compression encoding unit 12, a recording system 14, a memory circuit 18, and a recording head (REC HEAD;
g head) 20, a GOP data generation circuit (GOP GEN) 22, and a recording control circuit 24, and the compression encoding unit 12
Is composed of a compression encoding circuit 120 and a memory circuit 122. The reproducing unit 48 includes the decompression / decoding unit 58 and the reproducing system 5.
0, memory circuit 56 and playback head (PB HEAD: playba
ck head) 40, and the decompression decoding unit 58 includes a decompression decoding circuit 580 and a memory circuit 582.

FIG. 2 is a diagram showing the configuration of the recording system 14 shown in FIG. As shown in FIG. 2, the recording system 14 includes a pack circuit 150, an outer code encoder 152, an identification data adding circuit (ID add) 153, an inner code encoder 154, and a recording amplifier circuit (REC AMP; 156a, 1).
56b, an identification data generation circuit (ID GEN) 158 and a recording data connection / disconnection circuit (REC DATA ON / OFF) 160, and a clock of a recording signal applied to the helical track of the VTR tape 2 via the recording head 20. Signal (REC
It operates in sync with Freq.).

FIG. 3 is a diagram showing the structure of the reproducing head 40 shown in FIG. As shown in FIG. 3, the reproducing head 40
Is a playback head for non-tracking playback,
Each is connected to the memory circuit 500, and the VTR tape 2
Two positive azimuth reproducing heads 400 ₁ , 400 ₂ and two negative azimuths arranged on the tape running surface of the drum 30 at intervals of one width of the helical track. Playback heads (negative azimuth heads) 402 ₁ and 402 ₂ .

FIG. 4 is a diagram showing the configuration of the reproducing system 50 and the decompression decoding unit 58 shown in FIG. 1, and the connection relationship between these components and the system control circuit 60.
As shown in FIG. 4, the reproduction system 50 includes an inner code decoder circuit 500, a non-tracking control circuit 512, an outer code decoder circuit 518, a depacking circuit 524, and an identification data detection circuit 526. The circuit 580 is composed of a video expansion signal 584 and an audio processing circuit 586. The recording / reproducing apparatus 1 uses these components to compression-encode uncompressed digital audio / video data input from an audio / video processing apparatus such as an external editing apparatus, and the helical track already existing on the VTR tape 2. Recorded without tracing, VTR tape 2
The compressed and encoded audio / video data recorded in the above is reproduced and expanded / decoded by a so-called non-tracking method, and the original uncompressed audio / video data is restored and output.

The system control circuit (FIG. 1) 60 is used for recording and
The operation of each component of the recording / reproducing apparatus 1 is controlled based on the operation switch provided in the reproducing apparatus 1 or the operation data input from the terminal device or the like. Tape running system 6
2 runs the VTR tape 2. Drum rotation system 64
Rotates the drum 30. The camera unit 66 converts the captured audio signal and video signal into uncompressed audio data and uncompressed video data in digital format, and outputs them to the recording system 14 and the compression encoding unit 12, respectively.

The compression encoding circuit 120 of the compression encoding unit 12
Uses the memory circuit 122 to convert uncompressed video data (VIDEO) input from the camera unit 66 into, for example, MPEG (M
oving Picture Expert Group) method
Compression encoding is performed in units of (GOP; Group Of Picture) to generate compressed video data (REDUCTION DATA) and output to the recording system 14.

The GOP data generation circuit 22 generates GOP data indicating the boundary of GOP included in the compressed video data based on the operation timing of the compression encoding circuit 120, and outputs it to the recording control circuit 24. The recording control circuit 24 generates a recording data connection / disconnection signal and a helical track start signal based on the GOP data, and controls the operations of the recording system 14 and the erasing control circuit 26. The erasing control circuit 72 supplies an erasing signal to the fixed erasing head 70 to erase the audio / video data recorded on the VTR tape 2.

FIG. 5 is a diagram showing the structure of a recording block for audio / video data. In the recording system 14, the pack circuit 150 uses the memory circuit 18 to assemble the uncompressed audio data and the compressed video data into a predetermined recording format as shown in, for example, FIGS.・
Image data is generated and stored in the memory circuit 18. The outer code encoder 152 uses the outer code (FIGS. 5B and 5C; oute) from the audio / video data stored in the memory circuit 18.
r parity) is generated and added.

Recording data connection / disconnection circuit 160 (FIG. 2)
Is the recording data connection input from the recording control circuit 24.
A recording enable signal (rec enable) is generated based on the disconnection signal, and the output of the audio / video data of the recording amplification circuits 156a and 156b is controlled. Further, the recording data connection / disconnection circuit 160 generates a memory read signal based on the recording data connection / disconnection signal, and controls the output of the audio / video data to the identification data addition circuit 153 by the memory circuit 18.

FIG. 6 shows the identification data (ID) shown in FIG.
It is a figure which shows the content of. The identification data generation circuit 158
Edit identification data (E
The identification data shown in FIGS. 5A to 5D and FIG. 6 is generated based on the DIT ID) and is output to the identification data addition circuit 153. 4 shown in FIG. 5 (A) and FIG.
Of the bit identification data, the 0th bit (ID0) indicates the position in the track, the 1st bit (ID1) indicates the track number and the distinction between audio data and video data, and the 2nd and 3rd bits.
(ID2, ID3) are used for edit recording and non-tracking control.

As shown in FIG. 6, the identification data generating circuit 1
Of the edit identification data (EDIT ID) input from the system control circuit 60, the 0th bit is set as the sync block identification data (Sync Block ID) and the first bit is set as the video / audio identification data (VIDEO / AUDIO). ID) and track identification data (TRACK ID), the 2nd bit is the 0th to 7th bits of the history data (HISTORICAL ID),
The third bit is the in-point identification data (IN POINT), camcorder identification data (CAMCODER), cyclic identification data (CYCLI)
C ID) and the 8th to 9th bits of the history data.

Among these identification data, the in-point identification data is audio / video data which is logically 1 and included in the same recording block
The video data is included in the head GOP, and the logical value 0 indicates that the audio / video data included in the same recording block is included in the GOP other than the head of the audio / video data. Also, the camcorder identification data has a logical value of 1, and the audio / voice included in the same recording block
Indicates that the video data was recorded by a camcorder that does not have a flying erase head, and the audio / video data contained in the same recording block with a logical value of 0 is recorded by a camcorder that does not have a flying erase head. Indicates that it was recorded.

The identification data adding circuit 153 receives the parallel voice / audio input from the inner code encoder circuit 154.
The identification data input from the recording data connection / disconnection circuit 158 and the sync code shown in FIG. 5D are added to the video data, and the data is serialized in sync block units shown in FIGS. 5A and 6. The converted audio / video data is output to the inner code encoder circuit 154.

The inner code encoder circuit 154 generates and adds an inner code (FIGS. 5 (B) and (C); inner parity) from the audio / video data input from the identification data adding circuit 153 and adds the inner code to FIG. The recording blocks shown in B) to (D) are assembled and output to the recording amplifier circuits 156a and 156b. As described above, the error correction code added to the audio / video data by the outer code encoder 152 and the inner code encoder circuit 154 takes the form of a product code, and at least 1
Even if the audio / video data for one helical track of the VTR tape 2 is lost for each GOP, the missing audio / video data can be reproduced. However, in the present embodiment, in order to enable the reproduction of higher quality audio / video data, the outer code encoder 152 and the inner code encoder circuit 154 output audio / video data for two helical tracks for each GOP. A product code (FIGS. 5B and 5C) is added so that reproduction is possible even if it is lost.

The recording / amplifying circuits 156a and 156b respectively output the audio signals input from the inner code encoder circuit 154.
Amplify the image data, generate a recording signal, and print head 2
Output to the positive azimuth head and the negative azimuth head of 0.

FIG. 7 is a diagram showing audio / video data recorded on the VTR tape 2 shown in FIG. The recording head 20 (FIG. 1) is composed of a positive azimuth head A and a negative azimuth head B (not shown), and as shown in FIG.
The positive azimuth head A and the negative azimuth head B output the recording signals input from the recording amplifier circuits 156a and 156b to 1
2 helical tracks (for audio / video data in 625/50 format) or 10 helical tracks (525/6
The azimuth angle is alternately inverted for each helical track and recorded on the VTR tape 2 so that 1 GOP worth of audio / video data is included for each 0 format audio / video data).

FIG. 8 is a diagram for explaining non-tracking control by the non-tracking control circuit 512 (FIG. 4) of the reproducing system 50 shown in FIG. The positive azimuth heads 400 ₁ and 400 ₂ and the negative azimuth heads 402 ₁ and 402 ₂ (FIG. 3) of the reproducing head 40 read the recording signal recorded on the VTR tape 2 and read the inner code decoder circuit 500 (FIG. 3) of the reproducing system 50. Output to 4).

This will be described more specifically. For example, in FIG.
As shown in FIG.₁, 40
0_TwoHowever, there is a bend on the VTR tape 2
If you trace the helical track of the square,
Jimus head 400₁, 400 _TwoAudio and video read by
The intensity of the data (reproduction signal) is, for example, as shown in FIG.
The line width is shown in A and A '. Meanwhile, Ajma
Negative azimuth head 402 with different angle₁, 402_TwoIs a sound
Cannot read voice / video data. like this
In addition, the azimuth differs from the width of one helical track.
VTR tape with two heads each with corners
By tracing 2, each head can precisely
Positive / negative, both azimuths without tracing the track
You can read all of the tracks in the
Data can be obtained.

In the reproduction system 50 (FIGS. 1 and 4),
The inner code decoder circuit 500 includes a positive azimuth head 400.
₁ , 400 ₂ and negative azimuth heads 402 ₁ , 402
_The four playback signals input from ₂ are converted into four digital audio / video data. Further, the inner code decoder circuit 500 performs error detection and error correction on the audio / video data using the internal codes added to these four audio / video data, and identifies these audio / video data as identification data. It outputs to the detection circuit 526 and the non-tracking control circuit 512.

The non-tracking control circuit 512 is shown in FIG.
As shown in (A) and (B), the audio / video data error-corrected by the inner code is recorded in the memory circuit 560 in order of priority in the order of the number of errors. At this time, FIG.
As shown in (B), each GOP is set so that the VTR tape 2 can be reproduced even if the tracking is largely deviated.
Audio / video data for the two helical tracks before and after is also stored in the memory circuit 560.

In the outer code decoder circuit 518, the non-tracking control circuit 512 gives priority to the memory circuit 5.
The audio / video data is error-corrected by using the outer code added to the audio / video data stored in 60, and is output to the jog memory circuit 562. Identification data detection circuit 526
Is the speech that has been error-corrected by the inner code decoder 500.
The camcorder identification data and the in-point identification data (FIG. 6) included in the identification data of the video data are separated and output to the system control circuit 60. The jog memory circuit 562 outputs the stored audio / video data to the depacking circuit 524 according to the control of the system control circuit 60 and sends the screen at an arbitrary speed, so-called jog shuttle reproduction or the like.

The depacking circuit 524 separates the audio data and the video data from the audio / video data and outputs them to the external and expansion decoding circuit 580 (FIG. 1). In the decompression decoding circuit 580, the video decompression signal 584 expands the compressed video data input from the depacking circuit 524 of the reproducing system 50 by a method corresponding to the compression encoding circuit 120, and further freezes under the control of the system control circuit 60. Process and output to the outside. The identification data detection circuit 526 performs a predetermined process on the audio data input from the depacking circuit 524, further performs a mute process under the control of the system control circuit 60, and outputs the result to the outside.

The operation of the recording / reproducing apparatus 1 according to the present invention will be described below. First, the operation of the recording / reproducing apparatus 1 when recording new audio / video data (upper ground data) on the VTR tape 2 on which audio / video data (background data) has already been recorded, such as by continuous shooting. Will be explained. The compression encoding unit 12 compression encodes the uncompressed audio data (VIDEO) generated by the camera unit 66 by continuous shooting or the like. GO
The P data generation circuit 22 generates GOP data indicating the start point of the audio / video data (REDUCTION DATA) compressed and encoded by the compression encoding unit 12. Recording control circuit 24
Is a helical track start signal based on GOP data.
(TRACK START) and recording data connection / disconnection signal (REC O
(N / OFF) is generated and output to the recording system 14.

In the recording system 14, the pack circuit 150
FIG. 2 shows compressed video data and uncompressed audio data assembled into the recording blocks shown in FIGS. 5A to 5D and stored in the memory circuit 18 as audio / video data. Reference numeral 152 adds an outer code to the audio / video data stored in the memory circuit 18. The recording data connection / disconnection circuit 160 generates a memory read signal based on the GOP data, the helical track start signal, and the recording data connection / disconnection signal input from the recording control circuit 24, and the memory circuit at the timing indicated by the memory read signal. The first GOP of the audio / video data (upper ground data) to be newly recorded by reading the audio / video data recorded in 18 and adding the inner code and the synchronization code to the camcorder identification data of the identification data as a logical value 1. The in-point identification data of the recording block including is output as the logical value 1 to the recording amplification circuits 156a and 156b.

Recording data connection / disconnection circuit 160 (FIG. 3)
Generates a recording permission signal (REC ENABLE A, B) that permits the positive azimuth head A and the negative azimuth head B of the recording head 20 to apply the recording signal to the VTR tape 2. The positive azimuth head A and the negative azimuth head B of the recording head 20 are respectively recording amplifying circuits 156a, 156a while the recording permission signals A, B permit the application of the recording signal.
The recording signal input from 156b is applied to the VTR tape 2 for recording. The erase control circuit 72 generates an erase signal and outputs it to the erase head 72. The erasing head 72 erases audio / video data (background data) already recorded on the helical track.

FIG. 9 shows a case where the audio / video data (background data) already recorded in the video data compression apparatus 2 is overwritten with new audio / video data by continuous shooting or the like. It is a figure which shows the audio | video data recorded on. Since the recording / reproducing apparatus 1 does not have a flying erase head, in the range a in FIG.
The background data until just before the recording start point (IN point) of the upper ground data on the VTR tape 2 remains as it is, and in the range b of FIG. 9, the fixed erasing head 70 overwrites the upper ground data without erasing the background data. Recorded,
In the range c in FIG. 9, the fixed erasing head 70 causes the VT
The ground data is recorded after the background data on the R tape 2 is erased. Therefore, at the time of reproduction, the audio / video data recorded on the helical track after the IN point is mixed and reproduced. That is, from the range of FIG. 9B, there is a possibility that the base data and the top data, which have not been completely erased even when the top data is overwritten, are mixed and reproduced.

Next, the recording / reproducing apparatus 1 uses the VTR tape 2
Describes the operation when playing back audio / video data recorded in
I do. Positive azimuth head 40 of reproducing head 40 (FIG. 1)
0₁, 400_TwoAnd negative azimuth head 402₁, 40
2_Two(FIG. 3) is a recording signal recorded on the VTR tape 2.
Is read. Inner code decoder circuit 500 of reproduction system 50
(FIG. 4) is a positive azimuth head 400. ₁, 400_TwoAnd
And negative azimuth head 402₁, 402_TwoEntered from
Each of the four recorded signals is converted into four voices in digital format.
・ Converting to video data and performing error detection and
Error correction is performed to generate an error rate signal.

The non-tracking control circuit 512 stores four pieces of audio / video data in the memory circuit 560, prioritizes them in the order in which there are few errors detected by the inner code decoder circuit 500, and stores them in the memory circuit 560. To do. The outer code decoder circuit 518 performs error correction on the audio / video data stored in the memory circuit 560 using the outer code, outputs the error / correction data to the depacking circuit 524 via the jog memory circuit 562, and outputs the depacking circuit 524. Separates the error-corrected audio / video data into audio data and video data. The identification data detection circuit 526 outputs identification data corresponding to the output audio / video data to the system control circuit 60.

The system control circuit 60 checks the camcorder identification data and the in-point identification data among the identification data input from the identification data detection circuit 526, and the logic value of the camcorder identification data is 1 and the in-point is When the 4 logical values of the identification data are 1, the voice processing circuit 5
By activating the mute signal (MUTE) for 86, the output of the audio data reproduced from the VTR tape 2 immediately after the in point (FIG. 9) is stopped and the invalidation processing (mute) is performed.
Further, the system control circuit 60 activates a freeze signal (FREEZE) for the video expansion signal 584, and instead of the video data reproduced from the VTR tape 2 immediately after the IN point, normally reproduces from before the IN point to last. The audio / video data of the selected frame is output and freeze processing is performed.

The processing of the system control circuit 60 during reproduction will be further described below. FIG. 10 is a flowchart showing the processing of the system control circuit 60 when the recording / reproducing apparatus 1 (FIG. 1) according to the present invention reproduces the audio / video data recorded on the VTR tape 2. As shown in FIG. 10, in step 01 (S01), the system control circuit 60
Controls each component of the recording / reproducing apparatus 1 to
Playback of audio / video data from the tape 2 is started.

In step 02 (S02), the system control circuit 60 determines the camcorder identification data (CAM) and the in-point data (IN) among the identification data input from the identification data detection circuit 526, and determines which one of them. If Momo is the logical value 1, the process proceeds to S03. Step 03
In (S03), the reproduced audio / video data is delayed, and the identification data detected in the process of S02,
Match the timing of the reproduced audio / video data.

In step 04 (S04), the system control circuit 60 controls the video expansion signal 584 and the audio processing circuit 586, and at least the first G of the upper ground data.
The video data of the first frame of OP is replaced with the video data of the frame of the background data that was reproduced normally at the end. In step 05 (S05), the system control circuit 60 controls the jog memory circuit 562 to invalidate at least the audio data of the first frame of the first GOP of the upper ground data.

Under the control of the system control circuit 60 of the recording / reproducing apparatus 1 described above, the background data is recorded without being erased by the camcorder before and after the IN point, and the reproduction is performed by mixing the upper ground data and the background data during reproduction. If the reproduced audio / video data is that of the first GOP, invalidation processing and freeze processing are performed on the audio data and the video data of the first land data, respectively. As a result, it is possible to prevent noise from being generated in the reproduced audio data and video data, and to prevent deterioration in quality. Moreover, the recording / reproducing apparatus 1 according to the present invention can be realized by simply changing the software of the system control circuit without adding any hardware to the conventional camcorder. Therefore, there is no obstacle to downsizing and cost reduction of a simple recording / reproducing apparatus such as a camcorder.

[0047]

As described above, the voice according to the present invention
According to the video data recording / playback apparatus and the method thereof, for example, even if the recorded audio / video data is played back by continuously shooting using a camcorder that is configured integrally with a camera and does not have a flying erase head, Noise or the like does not occur in the audio / video obtained from the video tape at the boundary between the upper ground data and the ground data. Further, according to the audio / video data recording / reproducing apparatus of the present invention, it is possible to reproduce high-quality audio / video data from the video tape at the boundary portion between the upper ground data and the ground data which are continuously shot.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration of a recording system shown in FIG.

FIG. 3 is a diagram showing a configuration of a reproducing head shown in FIG.

FIG. 4 is a diagram showing a configuration of a reproduction system and a configuration of a decompression decoding unit shown in FIG. 1, and a connection relationship between these components and a system control circuit.

FIG. 5 is a diagram showing a configuration of a recording block of audio / video data.

6 is a diagram showing the contents of the identification data shown in FIG.

FIG. 7 is a voice recorded on the VTR tape shown in FIG.
It is a figure which shows video data.

8 is a diagram illustrating non-tracking control by the non-tracking control circuit (FIG. 4) of the reproduction system shown in FIG.

FIG. 9 is a diagram showing audio / video data recorded in the video data compression apparatus when the background data already recorded in the video data compression apparatus is overwritten with the upper ground data by continuous shooting or the like.

FIG. 10 shows a recording / reproducing apparatus (FIG. 1) according to the present invention, which is a VT.
9 is a flowchart showing processing of a system control circuit when reproducing audio / video data recorded on an R tape.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing apparatus, 10 ... Recording part, 12 ... Compression encoding part 12, 120 ... Compression encoding circuit 120, 122 ... Memory circuit 122, 14 ... Recording system, 150 ... Pack circuit, 1
52 ... Outer code encoder, 153 ... Identification data addition circuit, 154 ... Inner code encoder circuit, 156a, 156
b ... recording amplification circuit, 158 ... identification data generation circuit, 16
0 ... Recording data connection / disconnection circuit, 18 ... Memory circuit, 2
0 ... Recording head, 22 ... GOP data generation circuit, 24 ...
Recording control circuit, 70 ... Erase head, 72 ... Erase control circuit, 30 ... Drum 30, 40 ... Reproducing head, 50 ... Reproducing system, 500 ... Inner code decoder circuit, 512 ... Non-tracking control circuit, 518 ... Outer code decoder circuit 524
Depacking circuit, 526 Identification data detecting circuit, 56,
560 ... Memory circuit, 562 ... Jog memory circuit, 58
Decompression / decoding unit, 580 ... Decompression / decoding circuit, 582 ... Memory circuit, 584 ... Video decompression signal, 586 ... Audio processing circuit.

Claims (5)

[Claims] 1. A data dividing means for dividing audio / video data including audio data and video data into a predetermined recording unit in a unit of one frame or a plurality of frames, and each recording unit of the divided audio / video data. When,
Recording packet generation means for generating a predetermined recording packet by multiplexing at least the divided recording unit of the audio / video data with position data indicating whether or not the head frame of the audio / video data is included. Recording means for recording the generated recording packet on a tape recording medium, reproducing means for reproducing the recording packet recorded on the tape recording medium, recording unit of the audio / video data from the reproduced recording packet, and the position Separating means for separating the data, audio data invalidating means for invalidating the audio data contained in this recording packet when the separated position data indicates that it is included in the first frame, and the separated position Video of the frame that was played immediately before this recording packet to indicate that the data is included in the first frame Audio and video data recording and reproducing apparatus and a video data output means for outputting the over data. 2. The audio / video data is recorded in the frame unit over a plurality of helical tracks of the tape recording medium, and the audio / video data is recorded in the frame unit in units of one helical track in the frame unit. The audio / video data having the error correction code is further provided with an error correction code adding means for adding an error correction code so that the audio / video data can be reproduced even if the audio / video data is lost. Is divided into the recording units, the recording packet generating unit multiplexes each of the divided recording units and the position data to generate the recording packet, and the recording unit generates the recording packet from the recording unit. The audio / video data recording / reproducing apparatus according to claim 1, wherein azimuth recording is performed on a helical track of a tape recording medium. 3. The reproducing means has two reproducing heads for scanning the tape recording medium at intervals of the width of one helical track, respectively, and the helical of the tape recording medium having different azimuth angles. A plurality of data reading means for reading the recording packet from the track, wherein the separating means records the audio / video data from each recording packet read by each of the two reproducing heads of the plurality of data reading means; The error correction code and the position data are separated in the frame unit, and the error rate of the audio / video data separated in the frame unit is detected in the frame unit using the error correction code separated in the frame unit. The error rate detecting means and the detected error in the audio / video data separated by the frame unit. A selection unit that selects one of the lowest rates in the frame unit, and an error correction unit that uses the error correction code separated in the frame unit to error-correct the audio / video data selected in the frame unit are further included. The audio / video data recording / reproducing device according to claim 2. 4. A compression means for compressing at least the video data included in the audio / video data and supplying the compressed data to the data dividing means, and a decompression means for decompressing the audio / video data error-corrected in frame units. The audio / video data recording / reproducing apparatus according to claim 3, further comprising: 5. A tape recording medium on which other audio / video data may be already recorded, in one frame unit or in a plurality of frame units, and a position indicating a start position of the audio / video data. Data is overwritten and recorded, and the audio / video data overwritten and recorded on the tape recording medium and the position data are reproduced, of the audio / video data indicating that the reproduced position data is the head. An audio / video data recording / reproducing method of invalidating audio data of a frame and replacing the video data of the frame of the audio / video data indicating that the reproduced position data is the head with the other audio / video data.