JP3384160B2 - Digital video signal recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image compression recording type digital video signal recording apparatus and a reproducing apparatus, and particularly to a normal recording mode (SP mode) and a long time recording mode (high compression LP mode). Is related to what can be set.

[0002]

2. Description of the Related Art Development of a compression recording type digital VTR in which a digital video signal is compressed by a DCT and a variable length code and recorded on a magnetic tape by a rotary head is under way. Digital VTR of such compression system
Then, as shown in FIG. 6, an ITI area is provided at the beginning of each track, followed by an audio area,
A video area and a sub code area are provided. IT
The I area is a timing block for reliably performing post-recording, and is used for accurately performing positioning when post-recording and rewriting data written in subsequent areas. A digital audio signal is recorded in the audio area. A compressed digital video signal is recorded in the video area. The sub code area is used for high speed search. Normal recording mode (S
If P mode), the data of one frame, NT
The SC system records on 10 tracks, and the PAL system records on 12 tracks.

FIG. 7 shows the structure of a subcode area. The subcode area is, as shown in FIG. 7A,
It is composed of 12 sync blocks. One sync block is composed of 12 bytes as shown in FIG. 7B.

As shown in FIG. 7B, a sync pattern of 2 bytes is provided at the head of one sync block. Following this, ID data consisting of ID0 and ID1,
Three bytes of IDP, which is a parity for ID0 and ID1, are added. Next, a main area is provided in 5 bytes, and parity of 2 bytes is added. One sync block in the subcode area is 12 bytes,
It is shorter than the video and audio areas. This is to enable high speed search.

As shown in FIGS. 7C and 7D, ID0 is provided with an F / R flag for detecting an address during a high speed search. Following this, in sync block numbers SB0 and SB6, as shown in FIG. 7C, an application ID (AP3) indicating the data structure of the subcode is arranged, and an absolute track number is arranged so as to straddle the next ID1. It For sync block numbers other than that, as shown in FIG. 7D, an F / R flag is provided, followed by an index ID, a skip ID, and a photo picture ID, and an absolute track number so as to straddle ID1. Are placed. The index ID is for index search. The skip ID is for cutting unnecessary scenes. The photo picture ID is for searching a still image. The absolute track number and the sync number are recorded in ID1 so as to straddle ID0.

FIG. 8 shows data recorded in the main area of the subcode. The data in the main area is recorded in a pack structure based on 5 bytes as shown in FIG. The first 1 byte PC0 is a header. Data is arranged in the following 4 bytes PC1 to PC4. As shown in FIG. 7B, since the main data area of one sync block is 5 bytes, exactly one pack of data is recorded in one sync block.

As shown in FIG. 8, sync block number S
B3 to SB5 and SB9 to SB11 are main areas, and sync block numbers SB0 to SB2 and SB6 to SB.
8 is an optional area. The data in the main area of the subcode has a different structure in the first half of the frame (the first half 5 tracks in the NTSC system, the first half 6 tracks in the PAL system) and the second half (the latter half 5 tracks in the NTSC system, the latter half 6 tracks in the PAL system). ing. A title time code pack (TTC pack) and a title binary group pack (TBG pack) are recorded in the first half of one frame. In the latter half of one frame, a title time code pack (TTC pack), a video recording date pack (VRD pack) and a video recording time minute second pack (VDT pack), or an audio recording date pack (ARD pack). ) And audio recording hour minute second pack (A
RT pack) is recorded. In the optional area,
If the optional area is not used, it is recommended to record the same contents as the main area.

The F / R flag is, as shown in FIG. 10A,
5 tracks in the first half of one frame (NTSC system)
Alternatively, 6 tracks (in the case of the PAL system) are set to “1”, and the latter half 5 tracks or 6 tracks of one frame are set to “0”. This F / R flag can be used as an address at the time of search.

That is, as shown in FIG. 10B, F / R
The place where the flag rises from "0" to "1" is the beginning of the frame, and the place where the flag falls from "1" to "0" is the beginning of the latter half of the frame. Therefore, at the time of search, if it is detected whether the F / R flag rises from "0" to "1", the position of the beginning of one frame can be known.

[0010]

As described above, in the conventional digital VTR, one frame of video signal is 1
It is recorded on 0 or 12 tracks. In addition to such a recording mode (SP mode), it has been proposed to provide a mode (hereinafter referred to as a high-efficiency LP mode) in which the video signal compression rate is increased so that recording can be performed for a long time. . In the high efficiency LP mode, one frame of video signal is recorded on 5 tracks or 6 tracks. Therefore, a recording time twice as long as that in the SP mode can be obtained.

However, when such a high compression LP mode is provided, conventionally, it becomes difficult to detect an address at the time of search by the F / R flag.

That is, as described above, in the conventional case, F /
The R flag is set so that 5 or 6 tracks are "1" and the next 5 or 6 tracks are "0". In the high compression LP mode, since 5 tracks or 6 tracks are 1 frame, the F / R flag becomes “1” for the 5 tracks or 6 tracks and “0” for the next 5 tracks or 6 tracks as in the conventional case. With this setting, the F / R flag is recorded as shown in FIG. 11, and the F / R flag may not rise from "0" to "1" at the beginning of one frame. Therefore, S
The control must be changed between the P mode and the high compression LP mode as follows.

That is, as shown in FIG. 12, it is determined whether the mode is the SP mode or the high compression LP mode (step S10).
1). In the SP mode, it is detected whether the F / R flag has risen from "0" to "1" (step S
102), when the F / R flag rises from "0" to "1", it is set to the start position of one frame (step S).
103). In the LP mode, it is detected whether the F / R flag has changed from "0" to "1" or "1" to "0" (step S104), and the F / R flag has changed from "0" to "1" or When the change from "1" to "0" is detected, the start of one frame is set (step S10).
5).

However, the SP mode and the high compression LP mode may be recorded together on one tape. S
When the P mode and the high compression LP mode are recorded in a mixed manner, it is difficult to obtain an input signal in a high speed search such as 200 × speed, so it is difficult to determine the mode at the time of search. Thus SP mode and high compression LP
In the case where the modes are mixed and recorded, if the modes cannot be determined, the control by the F / R flag cannot be performed.

That is, as shown in FIG. 13, if the SP mode and the high compression LP mode are recorded together, the F / R
The state of the flag becomes as shown in FIG. 13B. Since the mode cannot be determined during high-speed search, for example, it is detected that the F / R flag has risen from "0" to "1" and
The control for detecting the beginning of the frame is continued (control in the SP mode). In this case, in the portion recorded in the SP mode, the F / R flag rises from "0" to "1" at the beginning of one frame, so the beginning of one frame (the beginning of frame F1) can be detected, but In the portion recorded in the compressed LP mode, the head portion of the frame can be detected only every two frames. That is, since the F / R flag rises from “0” to “1” at the beginning of the frames F2, F4, ..., The position of the beginning of the frame can be detected, but the F / R flag is detected at the beginning of the frames F3, F5 ,. Falls from "1" to "0", the position of the beginning of the frame cannot be detected.

Therefore, an object of the present invention is to provide a digital video signal recording apparatus and a reproducing apparatus capable of surely detecting an address from the state of the F / R flag even when recorded in different modes. is there.

[0017]

The present invention comprises first compression means for compressing a digital video signal, and second compression means for compressing the digital video signal at a higher compression ratio than the first compression means. Switching means for switching between a standard recording mode for compressing and recording the digital video signal by the first compression means and a long-time recording mode for compressing and recording the digital video signal by the second compression means, and an address detection flag. a recording unit Ru and a subcode data generating means for generating subcode data including standard SL
Decompress digital video signal compressed in recording mode
The first decompression means and the data compressed in the long-time recording mode.
Second decompression means for decompressing the digital video signal;
Digital video signal in standard recording mode by decompression means
The long-time recording mode by the second expansion means.
Switch between when expanding the digital video signal of the
Possible switching means and address detection in subcode
And a sub-code detecting means for detecting a flag for reproduction
It is composed of parts and when recording in standard recording mode
The number of tracks in one frame is M, in long-time recording mode
If the number of tracks in one frame when recording is N,
When recording in standard recording mode, the beginning of each frame
Position placed et shown people (M / 2) and tracks of the track to be in the rest of approximately (M / 2) of tracks position by inverting the address detection flag, upon reproduction subcode
From the output of the detection means, the address detection flag is in one state
Change from one state to the other state is detected
When the status flag changes from one state to the other,
This is a digital video signal reproducing apparatus for judging that the head position of the frame has been reached .

The present invention compresses a digital video signal
First compressing means and HDTV digital video signal
To compress the second pressure at a higher compression ratio than the first compression means.
Digital video signal by the compression means and the first compression means
Recording mode for compressing and recording data, and second compression means
HDTV digital video signal is compressed and recorded by
Switching means for switching between the HDTV recording mode
Generates subcode data including address detection flag
A recording unit having a subcode data generating means, and a standard
Decompress digital video signal compressed in recording mode
The first decompressing means and the HDTV recording mode compressed
Second decompressor for decompressing HDTV digital video signals
And the digital recording means of the standard recording mode by the first expanding means.
The case of decompressing the video signal and the second decompressing means.
Select whether to expand the HDTV digital video signal or not.
Switching means that can be changed and address detection in the subcode
A sub-code detecting means for detecting the use flag
It has a live part and when recording in standard recording mode
The number of tracks in one frame is P, HDTV recording mode
Q is the number of tracks in one frame when recorded in
When recording in the standard recording mode,
Almost (P / 2) tracks from the position of the first track
Minutes and the positions of the remaining approximately (P / 2) tracks
Invert the address detection flag to set the long-time recording mode.
Mode, the track at the beginning of each frame
About (Q / 2) tracks from the position of KU and the rest
(Q / 2) Track position and address detection flag
Invert the lag and output from the subcode detection means during playback
To address detection flag from one state to the other
It is detected that the address detection flag changes to
When the state of changes to the other state, the top position of the frame
Digital video signal that is judged to have reached
It is a recording / reproducing device.

[0019]

For example, in the NTSC system, one frame of video signal is recorded on 10 tracks in the SP mode, and one frame of video signal is recorded on 5 tracks in the high compression LP mode. It Therefore, NT
In the case of the SC system, in the SP mode, it is F with 5 tracks.
When the / R flag is inverted and the high compression LP mode is set,
The F / R flag is inverted on the third and second tracks.

In the PAL system, in the SP mode,
A video signal for one frame is recorded on 12 tracks,
In the high compression LP mode, one frame of video signal is recorded on 6 tracks. Therefore, in the PAL system, the F / R flag is inverted in 6 tracks in the SP mode, and the F / R flag is inverted in 3 tracks in the high compression LP mode.

By recording the F / R flag in this way, address detection by the F / R flag can be performed with the same control.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of a recording system of a digital VTR to which the present invention is applied. In this embodiment, in addition to the normal recording mode (SP mode), it is possible to set a recording mode (high compression LP mode) that enables long-time recording by increasing the compression rate. The mode settings are
It is performed by the input key 12.

In FIG. 1, reference numeral 1 is an input terminal for a digital video signal, and 2 is an input terminal for a digital audio signal. The digital video signal from the input terminal 1 is supplied to the switch circuit 3. A switch control signal is supplied from the controller 4 to the switch circuit 3. The switch circuit 3 is switched between the SP mode and the high compression LP mode by this switch control signal. Switch circuit 3
Is set to the terminal 3A side in SP mode, and high compression L
In the P mode, it is set on the terminal 3B side.

The output of the terminal 3A of the switch circuit 3 is supplied to the SP mode compression circuit 5. Terminal 3 of switch circuit 3
The output of B is supplied to the LP mode compression circuit 6. The SP mode compression circuit 5 and the LP mode compression circuit 6 are for highly efficient compression coding of a digital video signal by DCT and variable length coding.

That is, the SP mode compression circuit 5 and the LP
The mode compression circuit 6 is a blocking circuit that blocks the input video signal, a DCT conversion circuit that performs DCT conversion on the input video signal, a quantizer that quantizes the DCT-converted data, and a total code amount is estimated and optimized. It includes an estimator that determines a different quantizer and a variable-length coding circuit that performs variable-length coding using a two-dimensional Huffman code. The compressed video signal is arranged in a predetermined sync block and framed. When compressed by the SP mode compression circuit 5, one frame of video signal is recorded on 10 tracks or 12 tracks. When compressed by the LP mode compression circuit 6, a video signal of 1 frame has 5 tracks or 6 tracks.
Recorded on the track.

The output of the SP mode compression circuit 5 is supplied to the terminal 7A of the switch circuit 7. The output of the LP mode compression circuit 6 is supplied to the terminal 7B of the switch circuit 7. A switch control signal is supplied from the controller 4 to the switch circuit 7. The switch circuit 7 is switched between the SP mode and the high compression LP mode by this switch control signal. The switch circuit 7 is set to the terminal 7A side in the SP mode, and is set to the terminal 7B side in the high compression LP mode. The output of the switch circuit 7 is supplied to the multiplexer 8.

The digital audio signal from the input terminal 2 is supplied to the audio processing circuit 9. In the audio processing circuit 9, the audio signal is arranged in a predetermined sync block. The output of the audio processing circuit 8 is supplied to the multiplexer 8.

Subcode data is generated from the subcode generation circuit 10 based on a command from the controller 4. The subcode is used during high speed search. This subcode data is supplied to the multiplexer 8.

The multiplexer 8 switches between video data, audio data, and subcode data. The output of the multiplexer 8 is supplied to the head 11. The head 11 records the digital video data, the digital audio data signal, and the subcode data on the magnetic tape.

In such a digital VTR, as shown in FIG. 7, the subcode ID0 is provided with an F / R flag for address detection during high speed search. In one embodiment of the present invention, the setting of this F / R flag is S
The P mode recording is different from the high efficiency LP mode recording. That is, if the NTSC system, SP
In the mode, one frame of video signal is recorded on 10 tracks, and in the high compression LP mode, one frame of video signal is recorded on 5 tracks. Therefore, in the NTSC system, 5 in the SP mode.
The F / R flag is inverted on the track, and in the high compression LP mode, the F / R flag is inverted on the 3rd track and the 2nd track.

In the PAL system, in the SP mode,
A video signal for one frame is recorded on 12 tracks,
In the high compression LP mode, one frame of video signal is recorded on 6 tracks. Therefore, in the PAL system, the F / R flag is inverted in 6 tracks in the SP mode, and the F / R flag is inverted in 3 tracks in the high compression LP mode.

FIG. 2 shows the structure of a reproducing system of a digital VTR to which the present invention is applied. In FIG. 2, the reproduction signal of the head 21 is supplied to the demultiplexer 22. The demultiplexer 22 separates the reproduction signal of the audio area, the reproduction signal of the video area, and the reproduction signal of the subcode area.

The reproduction signal of the audio area is supplied from the demultiplexer 22 to the audio processing circuit 23. The audio processing circuit 23 performs processing such as time axis conversion and interpolation. The output of the audio processing circuit 23 is output from the output terminal 26.

The reproduction signal of the video area is supplied from the demultiplexer 22 to the switch circuit 24. A switch control signal is supplied from the controller 29 to the switch circuit 24. The switch circuit 24 is switched between the SP mode and the high compression LP mode by this switch control signal. The switch circuit 24 is set to the terminal 24A side in the SP mode, and the terminal 24B in the high compression LP mode.
Set on the side. The output of the terminal 24A of the switch circuit 24 is supplied to the SP mode expansion circuit 25. The output of the terminal 24B of the switch circuit 24 is supplied to the LP mode expansion circuit 26.

The SP mode decompression circuit 25 and the LP mode decompression circuit 26 perform the decoding of the variable length code and the inverse DCT,
It expands a compressed video signal into an original video signal. That is, the SP mode decompression circuit 25 and the LP mode decompression circuit 26 perform the opposite processing to the SP mode compression circuit 5 and the LP mode compression circuit 6 on the recording side (FIG. 1). SP mode decompression circuit 25 and LP mode decompression circuit 2
The output of 6 is supplied to the terminals 27A and 27B of the switch circuit 27. The switch circuit 27 includes a controller 29.
Is supplied with a switch control signal. Switch circuit 27
This switch control signal causes SP mode and high compression L
It can be switched between P mode. The switch circuit 27 is S
In the P mode, it is set on the terminal 27A side, and in the high compression LP mode, it is set on the terminal 27B side. Switch circuit 27
Is output from the output terminal 28.

The reproduction signal of the subcode area is supplied from the demultiplexer 22 to the subcode detection circuit 30. The subcode detection circuit 30 decodes the subcode data. The output of the subcode detection circuit 30 is supplied to the controller 29. During high-speed reproduction, a subcode is detected by the subcode detection circuit 30, and this subcode is supplied to the controller 29. A search or edit process is performed based on this subcode.

In one embodiment of the present invention, as described above, in the NTSC system, the F / R flag is inverted in 5 tracks in the SP mode and 3 tracks in the high compression LP mode. The F / R flag is inverted in two tracks. In the PAL system, the F / R flag is inverted in 6 tracks in the SP mode, and the F / R flag is inverted in 3 tracks in the high compression LP mode.

That is, FIG. 3 is a flow chart showing the setting of the F / R flag when recording in the NTSC system. As shown in the flowchart of FIG. 3, it is determined whether to record in the SP mode or the high efficiency LP mode (step S1). When recording in SP mode, F
The / R flag is set to "1" for the first 5 tracks and "0" for the latter 5 tracks (step S2). When recording in the high efficiency LP mode, the F / R flag is set to "1" for the first three tracks and "0" for the second two tracks (step S3).

When the F / R flag is set in this way,
With the same control in both SP mode and high efficiency LP mode,
The position of the beginning of the frame can be detected.

That is, FIG. 4 is a flow chart showing the control when the position of the beginning of the frame is detected using the F / R flag. As shown in FIG. 4, it is determined whether the F / R flag rises from "0" to "1" (step S21). F / R flag is "0" to "1"
When it rises to, the position of the beginning of the frame is set (step S22).

In one embodiment of the present invention, when an NTSC signal is recorded in a mixture of the SP mode and the high compression LP mode, the state of the F / R flag becomes as shown in FIG. Then, in one embodiment of the present invention, at the time of high-speed search, as shown in FIG. 4, it is detected that the F / R flag has risen from "0" to "1" and the position of the beginning of one frame is detected. Control is continued. In this case, FIG.
As shown in, even in the part recorded in SP mode,
Even in the portion recorded in the high compression LP mode, since the F / R flag rises from "0" to "1" at the beginning of one frame, the beginning of all frames can be detected.

In the above embodiment, in the case of the NTSC system and the high efficiency LP mode, the F / R flag is set to "1" for the first three tracks and "0" for the second two tracks. The track may be “1” and the latter three tracks may be “0”.

Further, the present invention can be similarly applied to the case where the mode for recording the video signal of the current television system and the mode for recording the video signal of the HDTV system are set. When recording an NTSC signal in SP mode, one frame is recorded on 10 tracks,
When recording a (1125-60) system HDTV signal, one frame is recorded on 20 tracks. Therefore, in the NTSC SP mode, the F / R flag is set to "1" for the first five tracks and "0" for the second five tracks.
When an HDTV signal of the (1125-60) system is recorded, the F / R flag is set to "1" for the first 10 tracks and "0" for the second 10 tracks. Also,
1 when recording a PAL system signal in SP mode
A frame is recorded on 12 tracks, and (1250-5
When recording the 0) type HDTV signal, one frame is recorded on 24 tracks. Therefore, in the SP mode of the PAL system, the first six tracks of the F / R flag are set to "1" and the second six tracks are set to "0".
0-50) system HDTV signal is recorded, F
For the / R flag, the first 12 tracks are "1" and the second 12
The track is set to "0".

[0044]

According to the present invention, for example, in the NTSC system, in the SP mode, the first 5 tracks are "1" and the latter 5 tracks are "0", and in the high compression LP mode, the first 3 tracks are The F / R flag is set such that when the track is "1", the latter two tracks are set to "0". In the PAL system, in the SP mode, the first six tracks are "1" and the latter six tracks are "0", and in the high compression LP mode, the first three tracks are "1" and the latter three tracks are "0". The F / R flag is set so that Therefore, F /
By detecting that the R flag rises from "0" to "1", the head of one frame can be detected, and it is not necessary to change the control according to the mode. Therefore, even when the SP mode and the high compression LP mode are mixed, the position of the beginning of the frame can be detected reliably.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a recording system of a digital VTR to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a reproducing system of a digital VTR to which the present invention is applied.

FIG. 3 is a flowchart used to describe an embodiment of the present invention.

FIG. 4 is a flowchart used to describe an embodiment of the present invention.

FIG. 5 is a schematic diagram used to describe an embodiment of the present invention.

FIG. 6 is a schematic diagram used for explaining a digital VTR.

FIG. 7 is a schematic diagram used to describe a subcode of a digital VTR.

FIG. 8 is a schematic diagram used for explaining a subcode of a digital VTR.

FIG. 9 is a schematic diagram used to describe a pack structure.

FIG. 10 is a schematic diagram used for explaining a conventional digital VTR.

FIG. 11 is a schematic diagram used to describe a conventional digital VTR.

FIG. 12 is a flowchart used for explaining a conventional digital VTR.

FIG. 13 is a schematic diagram used to describe a conventional digital VTR.

[Explanation of symbols]

5 SP mode compression circuit 6 LP mode compression circuit 10 Subcode generation circuit

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5 / 76,5 / 7826,5 / 783 H04N 5/91-5/93 G11B 27/28

Claims (6)

(57) [Claims] 1. A first compression means for compressing a digital video signal, a second compression means for compressing the digital video signal at a compression ratio higher than that of the first compression means, and a first compression means. Switching means for switching between a standard recording mode for compressing and recording a digital video signal by means of a switching means and a long-time recording mode for compressing and recording a digital video signal by the second compression means, and a subcode including an address detection flag. a recording unit Ru and a subcode data generating means for generating data, digital video signal compressed by the standard recording mode
And a digital video signal compressed in the long-time recording mode.
Second expansion means for expanding the digital signal and digital data in the standard recording mode by the first expansion means.
When the video signal is expanded and when the second expansion means is used.
The digital video signal in long-time recording mode
Switching means that can be switched depending on the case, and a sub code that detects an address detection flag in the sub code.
And a reproducing section having a mode detecting means, and at the time of recording, one frame when recording in the standard recording mode.
The number of tracks in the track is M
When the number of tracks in one frame is N,
When recording in the semi-recording mode,
From the position of the track that is about (M / 2) tracks,
With the positions of the remaining approximately (M / 2) tracks, the address
Invert the recording flag and record in the long-time recording mode.
When recording, the track position at the beginning of each frame
Almost (N / 2) tracks from the storage and the remaining (N /
2) Set the address detection flag at the track position.
The address is reversed from the output of the subcode detection means during inversion and reproduction.
The detection flag may change from one state to the other.
And whether the above address detection flag is in one state
When the state changes from one to the other, the beginning position of the frame is reached
A digital video signal reproducing device adapted to determine that the 2. The first compression means comprises (525-6).
0) system video signal is recorded on 10 tracks
Is to be compressed into The second compression means is a (525-60) type video device.
Compressing so that the audio signal is recorded on 5 tracks
And When recording in the standard recording mode above,
Position of first trackFrom 5 tracksWhen,Remaining
The address detection flag is reversed at the position of 5 tracks.
Turn it over, When recording in the long-time recording mode, each frame
Position of the beginning track ofFrom 3 or 2 tracks
When,2 remainingOrThreeAddress above with track position
The device according to claim 1, wherein the detection flag is inverted.
Digital video signal recordingPlaybackapparatus. 3. The first compression means comprises (625-5).
The video signal of 0) system is compressed so that it is recorded on 12 tracks, and the second compression means compresses the video signal of (625-50) system on 6 tracks. When recording in the standard recording mode, the address detection flag is inverted at the positions of 6 tracks from the beginning of each frame and the positions of the remaining 6 tracks, and When recording in the time recording mode, 3 tracks from the position of the beginning track of each frame and the remaining
2. The digital video signal recording / reproducing apparatus according to claim 1, wherein the address detection flag is inverted at the positions of three tracks. 4. A first compression means for compressing a digital video signal; a second compression means for compressing an HDTV digital video signal at a compression ratio higher than that of the first compression means; and a first compression means. Switching means for switching between a standard recording mode for compressing and recording a digital video signal by the HDTV recording mode for compressing and recording an HDTV digital video signal by the second compression means, and a subcode including an address detection flag. a recording unit Ru and a subcode data generating means for generating data, digital video signal compressed by the standard recording mode
A first decompression means for decompressing the HDTV, and an HDTV digitizer compressed in the HDTV recording mode.
Second decompression means for decompressing the video signal, and digital recording in the standard recording mode by the first decompression means.
When the video signal is expanded and when the second expansion means is used.
HDTV digital video signal
Switching means that can be exchanged and a sub code that detects the address detection flag in the sub code.
And a reproducing section having a mode detecting means, and at the time of recording, one frame when recording in the standard recording mode.
Record the number of tracks in the P in the above HDTV recording mode
If the number of tracks in one frame is Q,
When recording in standard recording mode, the beginning of each frame
About (P / 2) tracks from the position of the track
And the positions for the remaining approximately (P / 2) tracks,
The flag for dress detection is reversed and the above long-time recording mode
When recording with, the track at the beginning of each frame
About (Q / 2) tracks from the position of, and the rest
(Q / 2) Track position and address detection flag
The lag is reversed and the address above is output from the output of the subcode detection means during playback.
The detection flag may change from one state to the other.
And whether the above address detection flag is in one state
When the state changes from one to the other, the beginning position of the frame is reached
A digital video signal recording / reproducing apparatus adapted to determine that the video signal has been recorded. 5. The first compression means is (525-6).
The video signal of 0) system is compressed so that it is recorded on 10 tracks, and the second compression means is (1125-60) system HD.
The TV video signal is compressed so that it is recorded on 20 tracks. When recording in the standard recording mode, 5 tracks from the position of the track at the beginning of each frame and the remaining 5 tracks are recorded. When the address detection flag is inverted depending on the position and recording is performed in the HDTV recording mode, 10 tracks from the position of the head track of each frame,
5. The digital video signal recording / reproducing apparatus according to claim 4, wherein the address detection flag is inverted at the positions of the remaining 10 tracks. 6. The first compression means is (625-5).
The video signal of 0) system is compressed so as to be recorded on 12 tracks, and the second compression means is (1250-50) system HD.
The TV video signal is compressed so that it is recorded in 24 tracks. When recording in the standard recording mode, 6 tracks from the position of the track at the beginning of each frame and the remaining 6 tracks are recorded. When the address detection flag is inverted at the position and recording is performed in the HDTV recording mode, 12 tracks from the position of the head track of each frame,
5. The digital video signal recording / reproducing apparatus according to claim 4, wherein the address detecting flag is inverted at the positions of the remaining 12 tracks.