JP3264432B2 - Digital signal processing method and digital signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of areas (hereinafter referred to as "tracks") within a predetermined period (hereinafter referred to as "frame").
In a digital playback device that plays back a recording medium on which a signal describing an audio mode is recorded for each time, when a signal indicating a different audio mode is detected within a certain period due to an error during connection recording or playback, or the like. The present invention relates to a digital signal processing method and a digital signal processing device.

[0002]

2. Description of the Related Art A digital VTR (hereinafter, referred to as a digital VTR) for recording a video signal and an audio signal by a digital signal has been developed. FIG. 7 shows a recording format of such a digital VTR on a tape. In the figure, a margin is provided at both ends of the track, and an ITI area for surely performing the after-recording, an audio area for recording an audio signal, and a video area for recording a video signal are provided from the recording start end side inside the margin. , A sub-code area for recording subsidiary data. An inter-block gap (IBG) is provided between the areas to secure the area. Such tracks are collected for 10 tracks and recorded as information for one frame (525/60 system).

Next, details of signals recorded in each of the above areas will be described.

(1) ITI area The ITI area is, as shown in an enlarged part of FIG.
1400 bit preamble, 1830 bit SS
A (Start-Sync Block Area),
90-bit TIA (Track Information)
on Area) and a 280-bit postamble.

[0005] Here, the preamble has a function such as a run-in of the PLL at the time of reproduction, and the postamble has a role to gain a margin. And SSA and TIA are
Each block data has a predetermined SY in the first 10 bits of the block data.
An NC pattern (ITI-SYNC) is recorded.

In the 20-bit portion following the SYNC pattern, SYNC block numbers (0 to 60) are mainly recorded in SSA, and 3-bit APT information (APT2 to APT0) is mainly used in TIA. An SP / LP flag for identifying a recording mode and a PF flag indicating a reference frame of the servo system are recorded. Note that A
PT is ID data that defines the data structure on the track, and takes a value “000” in the digital VTR of the conventional example.

From the above description, since a large number of sync blocks with a short code length are recorded at fixed positions on the magnetic tape in the ITI area, for example, S
By using the position where the 61st SYNC pattern of the SA is detected as a reference for defining the after-recording position on the track, the position to be rewritten at the time of after-recording can be defined with high accuracy, and good after-recording can be performed.

(2) Audio Area The audio area has a preamble and a postamble before and after the audio area as shown in the enlarged portion of FIG. 7, and the preamble is located before the run-up for pulling in the PLL and the audio SYNC block. Pre-S for detection
It is composed of YNC. Also, the postamble is
Post SYN to confirm end of audio area
C and a guard area for protecting the audio area at the time of video data dubbing.

[0009] The audio data recorded in the area sandwiched between the amble areas is generated as follows. First, an audio signal for one track to be recorded is subjected to A / D conversion and shuffling, then framing is performed, and further parity is added. FIG. 8 shows a format in which parity is added by performing framing.
In the figure, 5-byte audio accompanying data (hereinafter referred to as "AAUX data") is added to the beginning of 72-byte audio data to form 77-byte data per block, and these are vertically stacked into 9 blocks for framing. Then, an 8-bit horizontal parity C1 and a block 5
A vertical parity C2 corresponding to the number is added. 90 × (9 + 5) × 8 = 1,080 thus obtained
10080 obtained by subjecting a bit signal to 24-25 conversion
A digital signal of × (25/24) = 10500 bits is recorded in an audio section in one track shown in FIG.

(3) Video Area The video area has the same preamble and postamble as the audio area as shown in the enlarged part of FIG. However, it differs from that of the audio area in that the guard area is formed longer. Video data is formed between a preamble and a postamble.

(4) Subcode Area The subcode area is an area provided mainly for recording information for high-speed search, and is formed so that the front and rear portions thereof are sandwiched between a preamble and a postamble. However, unlike the audio area and the video area, the pre-SYNC and the post-SYNC are not provided.

Each of the SYNCs constituting the audio area, the video area, and the subcode area described above.
The blocks are subjected to a 24/25 conversion (a recording modulation method in which a data of every 24 bits of a recording signal is converted into 25 bits to add a tracking control pilot frequency component to a recording code) in the recording modulation. Therefore, the recording data amount of each area has the number of bits as shown in FIG.

(5) Structure and Type of Pack As described above, in the digital VTR, AA of the audio area on the tape is used as an area for recording accompanying data.
A UX area or the like is used, and these are configured in units of a pack having a fixed length of 5 bytes. Of these 5 bytes, the first byte (PC0) is an item indicating the content of the data. For example, "AUX SOUR" in FIG.
CE "and" AAUX SOURCE CONTROL ".

"AAUX SOURCE" is used to record accompanying data relating to audio. That is, as shown in the figure, a flag (LF) indicating whether the audio sample frequency is locked to the video signal, the number of audio samples per frame (AF SIZE), the number of audio channels (CH), each audio Mode information such as channel stereo / monaural (PA and AU)
DIO MODE), information on the television system (50/60 and STYPE), presence / absence of emphasis (EF), time constant of emphasis (TC), sample frequency (SMP), and quantization information (QUA) are recorded.

[0015] Also, "AAUX SOURCE CON"
"TROL" is SCMS data (the upper bits indicate whether or not there is a copyright, and the lower bits indicate whether or not the original tape), copy source data (which indicates whether the signal is an analog signal source), copy generation data, cipher (encryption) ) Type data (CP), cipher data (CI), flag (REC ST) indicating whether the frame is a recording start frame, flag (REC END) indicating whether the frame is a recording last frame, original recording / after-recording recording / insert recording, etc. The recording mode data (REC MODE), the flag (DRF) indicating the direction, the reproduction speed data, and the genre category of the recorded contents are recorded.

In the above described digital VTR, "AAUX
SOURCE ”information is at least one per track.
Times, that is, 10 times or more are recorded in one frame. Also, there are some information about the sample frequency, the number of channels, the type of signal of each channel (L, R, bilingual, etc.), the quantization method (16-bit linear, 12-bit non-linear, etc.), and the emphasis characteristics. You can select from among the settings, and select the setting
X Source ”is recorded in PC2, PC3, PC4, and at the time of reproduction, this information is analyzed to determine a processing method of the audio signal. The above information is hereinafter referred to as an audio mode.

Normally, since the above-mentioned audio mode does not change within one frame, the same audio mode is recorded for one frame. However,
In the following cases, two or more different audio modes may be detected in 10 tracks forming one frame.

(1) When another program having an audio signal of an audio mode different from the audio mode of a recorded program is recorded on a recording medium on which a certain program is already recorded, during the recording, the recording medium is always recorded. If it is configured to record a new program from the frame boundary,
The audio mode is not switched in the middle of the frame, but if such consideration is not taken, the audio mode may be switched in the middle of the frame.

(2) When the reproducing head of the digital VTR is clogged or dropped out, an accurate audio mode of the recorded program cannot be obtained, and the recorded program may not be correctly reproduced.

(3) When recording a digital VTR, the VTR may malfunction due to power supply noise or electromagnetic waves, and the audio mode of the recorded program may not be accurately recorded.

In the following cases, the audio mode of the recorded program may be an undefined value or a value outside the range may be detected.

(1) When the head of the digital VTR is clogged or dropout occurs.

(2) When a VTR malfunctions due to power supply noise or electromagnetic waves during recording of a digital VTR.

(3) When the number of channels, sample frequency, and the like are newly defined by a new format after the digital VTR is manufactured, and recording is performed based on this.

(4) When a recording medium on which special recording has been performed on the premise of reproduction by a special reproducing machine is reproduced for the purpose of viewing only at a specific place such as inside an airplane.

Despite the various problems described above, conventionally, the audio mode in the frame is determined by collecting the audio modes in "AUX SOURCE" recorded in each track and simply taking a majority decision, Information recorded on a specific track (for example, the first track or the n-th track) is used as representative information.

[0027]

However, in the above-mentioned conventional example, when determining the audio mode of the current frame, the past state and the reliability of the information recorded in the current frame can be reflected. Therefore, the most reliable audio mode could not be determined according to the situation.

When information indicating an audio mode different from the already determined audio mode is detected in the current frame, the entire audio signal reproduced from the frame has been muted. The sound during the period (frame) was sometimes interrupted.

[0029]

[Means for Solving the Problems ] To solve the above problems,
In order, a digital signal processing method according to the present invention, a period of time
Recording medium that divides the information signal of
When reproducing the information signal from the body or when the recording medium
Digital signal processing when receiving the information signal reproduced from the
The track , wherein each of the tracks has the information signal
Mode data indicating the mode is respectively stored, the
When detecting mode data in each track,
A mode of a previous period forming a certain period immediately before the certain period,
Mode data indicating the same mode is more than half of the plurality
If detected, change the mode of the previous period to the plurality of tracks.
And the mode of the previous period.
Mode data indicating the same mode is less than half of the plurality
And a mode different from the mode of the previous period.
If the mode data is detected for a predetermined number or more, the
The plurality of modes indicated by the mode data detected by more than
While determining the mode in the track, the front
The mode data indicating the same mode as the mode of the period is
Less than half and different from the previous period mode
Mode data that indicates the
If so, the mode of the previous period can be
Mode, and according to the determined mode
A digital signal of the information signal in the plurality of tracks;
Signal processing is performed.

A digital signal processing method according to the present invention
Divides the information signal for a certain period into multiple tracks and records
When reproducing the information signal from the recorded recording medium or before
Data for receiving the information signal reproduced from the recording medium.
A digital signal processing method, wherein each track is
The mode data indicating the mode of the information signal is stored respectively.
And the mode data in each of the tracks is detected.
The first and third tracks in three consecutive tracks
And the mode data of the third track is the same,
The mode data of the first track is different from the first and third modes.
If the mode data of the second track is 1
Replaced by the mode data of the third and third tracks
Of the plurality of tracks after the replacement process is completed.
The majority process in the
Mode is the mode indicated by the mode data detected most often.
The plurality of tracks according to the determined mode.
Performing digital signal processing of the information signal in the network
It is characterized by the following.

A digital signal processing method according to the present invention
The information signal at
Tracks are recorded separately in the track, and the
The information signal on the plurality of tracks according to the
When performing digital signal processing of items, the plurality of tracks
Detecting the presence or absence of an error in the mode data in the click, before
The determined mode and the stored mode data
Is a track different from the mode indicated by
For tracks where data errors have been detected,
Process all information signals in the rack as if they were mistaken.
The determined mode and the stored mode
The track is different from the mode indicated by the data, and
Tracks for which no mode data error was detected
Then, the information signal in the track is changed to the determined mode.
The processing is performed according to the password.

A digital signal processing method according to the present invention
The information signal at
Tracks are recorded separately in the track, and the
The information signal on the plurality of tracks according to the
When performing digital signal processing of items, the determined model
Mode and the mode indicated by the stored mode data.
For tracks with different numbers, set in the mode data.
Depending on which detail item is inconsistent
All information signals in the track are regarded as errors.
Or determine the information signal in the track
Determining whether to process according to the set mode
It is assumed that.

A digital signal processing device according to the present invention
Has applied the digital signal processing method as described above.
It is characterized by the following.

[0034]

[0035]

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital signal processing method and a digital signal processing device according to the present invention will be described below with reference to the drawings.

The signal reproducing system of the digital VTR has, for example, a configuration as shown in FIG. In the figure, a reproduced signal obtained from a magnetic tape (not shown) by a magnetic head 1 is supplied to an equalizer 3 after being amplified by a preamplifier 2. Then, the signal subjected to the equalization processing by the equalizer 3 is further supplied to the digital signal detection circuit 4, where the logical values "1" and "0" are set.
Is obtained. This digital signal is supplied to the digital signal processing circuit 5, where AA
“AAUX S” is output by the UX SOURCE extraction circuit 6.
OURCE ”is extracted.

The extracted "AAUX SOURCE" is processed by the microcomputer 7 to determine an audio mode and an audio signal processing method, and are supplied to the audio processing circuit 8 for processing the audio signal. The video signal is processed by the video processing circuit 9, and the audio signal and the video signal are converted into analog signals by the D / A converter 10 and output from the audio out and the video out.

<First Embodiment> Next, the processing performed by the microcomputer 7 will be described with reference to FIG.

[0040] The extracted "AAUX SOURCE"
Is recorded once or more in one track as described in the conventional example, but in this embodiment, "AAUX
SOURCE "is recorded once on one track, and one frame is formed on ten tracks. From the extracted "AAUX SOURCE", data other than the undefined and out-of-range data is removed, and only data without error is extracted. In the remaining data, when the data indicating the same audio mode as the previous frame (the audio mode determined in the previous frame) is half or more (5 or more in the present embodiment), the previous frame is used. Is continuously used as the audio mode of this frame. This is because the audio mode is not changed frequently, and it is estimated that the audio mode of the previous frame is likely to be continued.

On the other hand, less than half the data indicating the same audio mode as the previous frame (less than 5 in this embodiment)
When the data indicating one audio mode different from the previous frame is half or more (five or more in this embodiment), the audio mode is set as the audio mode of the frame. At this time, it is presumed that the possibility that the audio mode of the signal recorded by rewriting or the like has been changed is high.

Also, less than half the data indicating the same audio mode as the previous frame (less than 5 in this embodiment)
If the data indicating one audio mode different from the previous frame is also less than half (less than 5 in this embodiment) (if there is no data indicating one audio mode that is more than half), The same audio mode as that of the frame is continuously used as the audio mode of the frame. This is because it is highly likely that good data could not be acquired in this frame due to damage to the tape, etc. If this factor (such as damage to the tape) is removed, the original audio mode may be restored. This is because it is presumed to be expensive.

At the start of tape reproduction without data indicating the audio data of the "previous frame", the preset predetermined mode is treated as data indicating the audio mode of the "previous frame".

A more specific example will be described with reference to FIG. As described above, the frame is composed of 10 tracks, and only frames having no error are extracted. (1) The audio mode of the previous frame is pattern A, and of the ten subsequent “AAUX SOURCEs”, four indicate pattern A, six indicate pattern B, and six indicate pattern B. Because it is more than half
The audio mode of the frame is pattern B. (2) The audio mode of the previous frame is pattern A. Of the ten subsequent “AAUX SOURCEs”, patterns A and B each have the same number as four, and both patterns have the same number. Since the number is less than half, the audio mode of the frame uses the pattern A continuously. (3) The audio mode of the previous frame is pattern A, and of the ten subsequent “AAUX SOURCEs”, those indicating pattern B and pattern C are 4 respectively.
Since the number is the same as the number and the maximum number is not determined to be one, the audio mode of this frame is continuously set to pattern A.

<Second Embodiment> Of the "AAUX SOURCE" recorded on ten tracks, the latest one (backward track) is weighted to determine the audio mode of the frame. Specifically, numbers are assigned from the first track, and the numerical values are added to perform weighting.

For example, in the case of (1) of the first embodiment, the track indicating the pattern A in the audio mode has one track.
1 + 2 + 3 + 4 = 10
Becomes On the other hand, since the track indicating the pattern B exists from the fifth to the tenth, 5 + 6 + 7 + 8 + 9 + 10 =
It becomes 45. Therefore, the pattern B located in the rear is emphasized, and the audio mode of the frame is set to the pattern B.

Similarly, in the above-mentioned first embodiment (2), the track indicating the audio mode pattern A is one.
+ 2 + 3 + 4 = 10, and the pattern B indicates 7
+ 8 + 9 + 10 = 34. Therefore, the pattern B located in the rear is emphasized, and the audio mode of the frame is set to the pattern B.

Further, in (3) of the first embodiment, the audio mode B and the audio mode C have the same number, but in consideration of the fact that the audio mode C is distributed more rearward, the pattern B Is present in the third to sixth tracks, so 3 + 4 + 5 + 6 = 18. Since the pattern C exists in the seventh to tenth tracks,
7 + 8 + 9 + 10 = 34. Therefore, the pattern C is set to the audio mode of the frame.

Third Embodiment Next, a third embodiment will be described with reference to FIGS. First, "AAUX SOURCE" and "AA" obtained from 10 tracks
An error flag indicating whether or not there is an error in “UX SOURCE” is input to the microcomputer 7.

When there is an error in “AUX SOURCE” and a correct audio mode cannot be obtained,
The audio mode of the track on both sides of the track in which “AUX SOURCE” has an error is checked, and if it is the same audio mode, “AUX with error” is detected.
SOURCE "is replaced with the audio mode on both sides.

If the audio modes of the tracks on both sides of the track in which “AUX SOURCE” has an error are not the same audio mode, the erroneous “AUX SOURCE” is deleted.

Then, the error-free "AAUX SOU"
RACE "and" AUX SOURCE "replaced with the same audio mode as the adjacent tracks are deleted from the undefined and out-of-range data, and the remaining majority is taken.

When the maximum number of audio modes is determined to be one by the above processing, the audio mode determined by majority is set as the audio mode of the frame. When the maximum number of audio modes is not determined to one, the previous frame is determined. Is continuously used as the audio mode of the frame.

A more specific example will be described with reference to FIG. (1) There is an error in the data of the fifth track and the data of the seventh track.
Since the data of the fifth track is not the same, the data of the fifth track is deleted. Since the data of the sixth and eighth tracks on both sides of the seventh line both indicate the pattern B, the audio mode of the seventh track is replaced with the pattern B. Thereafter, when a majority decision is made, the number of patterns A is four and the number of patterns B is five, so that the audio mode of the frame is pattern B. (2) There is an error in the data of the fourth track and the data of the fifth track, and the data adjacent to each other is an error, so that the data on both sides are not the same. Therefore,
When all the data are deleted and the majority decision of the remaining data is taken, the pattern A is 3 pieces and the pattern B is 5 pieces.
Therefore, the audio mode of the frame is pattern B.

<Fourth Embodiment> By the way, there is a greater possibility that the audio mode changes at a place where the recording signal is switched than at other places. In the digital video format, information indicating the start and end of recording is indicated in the recording start frame and the recording end frame by “REC ST” and “REC E” in “AUXSOURCE CONTROL”. Alternatively, the algorithm for determining the audio mode or the parameters of the criterion may be changed between the recording start frame and other frames and / or the recording end frame and other frames. For example, in the first embodiment shown in FIG. 2, when the number of tracks indicating the same audio mode as the previous frame is less than 5 out of 10, the start frame of recording and / or the end frame of recording may If there are four or more tracks showing different audio modes from the frame, the new audio mode is adopted, and elsewhere,
A method of switching to a new audio mode when there are six or more tracks indicating an audio mode different from that of the previous frame is conceivable.

As described in the second embodiment, the method of determining the weight of the audio mode of the rear track by weighting may be adopted only at the transition of recording. At the start of tape reproduction, the same treatment as at the transition of recording may be performed.

Next, the handling of audio data of each track in the frame for which the audio mode has been determined will be described.

Regarding a track whose audio mode indicated by "AAUX SOURCE" is different from the determined audio mode (the audio mode obtained by each of the above-described embodiments), regardless of the presence or absence of an error, the audio in the track is determined. All signals are considered to be in error and audio signal processing can be performed. In this case, if the audio signal is completely reproduced from the data shuffled and distributed to each track by using an error correction technique, the audio signal can be heard without any deterioration. In addition, since the audio signal is layered and encoded and cannot be completely reproduced, if the reproduction can be performed with some loss of sound quality, the user can listen to the contents of the sound.

Another method of handling audio data will be described with reference to FIG. If the audio mode of the frame is determined, it is checked whether the audio mode of each track forming the frame matches the audio mode of the frame, and if it is, the audio data of the track is processed according to the audio mode of the frame. I do. On the other hand, if the audio mode of the track does not match the audio mode of the frame, the presence / absence of an audio data error flag is checked.
If the error flag is “error present”, “AUX S
Although there is an error in the data of “OURCE”, the audio mode is regarded as the audio mode of the frame and the audio data is processed. "AAUX SO
If there is no error in the data of "URCE" and an audio mode different from the audio mode of the frame is indicated, it is highly possible that the audio data of the track is different from the audio data of the frame, and All audio data is processed assuming that it is an error.

In the case where "AUX SOURCE" indicating the audio mode as described in the third embodiment causes an error and the audio modes of the tracks adjacent to the track are checked, a method of processing the audio data will be described. When the audio modes of the tracks on both sides of the track in which the error has occurred match the audio mode of the frame, the audio data of these tracks is processed as if they match the audio mode of the frame. On the other hand, when any one of the tracks on both sides is different from the audio mode of the frame, the audio mode becomes indefinite, and the audio data of the erroneous track may be regarded as an error, and the audio data may be processed.

Also, the "AAUX SOUR" of each track
The handling when the audio mode indicated by “CE” is different from the audio mode of the frame may be determined in accordance with the magnitude of the effect of misinterpreting the audio mode.

For example, when the sampling frequency is wrong, the audio data is interpreted completely differently, which has a significant effect on the output audio signal.
However, when two modes having different emphasis, equalization, and the like are mistaken, the sound quality slightly changes, but does not cause a major failure. Therefore, the audio mode indicated by "AUX SOURCE" of each track is different from the audio mode of the frame, and when an error flag is set, if the influence of misinterpretation is large, all data of the track is regarded as an error. When the effect of misinterpretation is relatively small, it is considered that the frame is recorded in the audio mode of the frame,
It is also possible to take advantage of utilizing the audio data of the track. To achieve this, the audio mode of the frame and the "AAUX SOUR"
According to the type of combination with the audio mode indicated in "CE", the processing method of the audio data of the track is stored in the memory in advance, and after the current situation is searched by the microcomputer, the audio data is processed according to the predetermined method. Just do it.

Here, when the audio mode of the track is undefined or indicates a value out of the range, the audio mode of the frame does not become such a value. The modes will be different. Therefore, when an undefined or out-of-range value is detected as having no error, all audio data of the track is regarded as having an error. When an undefined or out-of-range value is detected as having an error, the audio data is regarded as having an error. All audio data of the track is regarded as an error or is processed as audio data according to the audio mode of the frame.

Although the example of recording and reproducing the audio signal in the digital VTR has been described above, the present invention is not limited to this. For example, the information signal is a video signal, the mode is a compression method such as MPEG1 or MPEG2, and its parameters. And so on. The present invention is not limited to recording / reproducing, but also supports digital signal processing in transmission / reception using a transmission path.

[0065]

As described above, according to the digital signal processing method and the digital signal processing apparatus of the present invention, the number of modes and the weights of the modes of each field of the frame are considered in consideration of the mode of the frame before the frame. Determines the mode for processing digital signals, and also changes the data processing method depending on the mode of each field and the presence or absence of errors, so that the most reliable mode can be determined according to the situation. And the data processing can be performed appropriately.

[Brief description of the drawings]

FIG. 1 is a diagram showing a reproduction system of a digital VTR to which a digital signal processing method according to the present invention is applied.

FIG. 2 is a diagram showing one embodiment of a digital signal processing method according to the present invention.

FIG. 3 is a diagram showing a specific example of processing according to an embodiment of the digital signal processing method according to the present invention.

FIG. 4 is a diagram showing another embodiment of the digital signal processing method according to the present invention.

FIG. 5 is a diagram showing a specific example of processing according to another embodiment of the digital signal processing method according to the present invention.

FIG. 6 is a diagram showing a data processing method by a digital signal processing method according to the present invention.

FIG. 7 is a diagram showing a recording format of one track of a digital VTR.

FIG. 8 is a diagram showing a structure of an audio frame format.

FIG. 9: AAUX SOURCE pack, AAUX S
It is a figure showing an OUR CONTROL pack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 2 Preamplifier 3 Equalizer 4 Digital signal detection circuit 5 Digital signal processing circuit 6 AAUX SOURCE extraction circuit 7 Microcomputer 8 Audio signal processing circuit 9 Video signal processing circuit 10 D / A converter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/782-5/783 H04N 5/91-5/956 H04N ⁷ /24-7/68 G11B 20 / 10-20/12

Claims (4)

(57) [Claims] An information signal for a predetermined period is divided into a plurality of tracks.
Reproducing the information signal from a recording medium recorded by splitting
Or the information signal reproduced from the recording medium is received.
A digital signal processing method, wherein each track has a mode indicating a mode of the information signal.
Data is stored, and when detecting the mode data in each track,
The mode of the previous period forming the predetermined period immediately before the predetermined period
Mode data indicating the same mode as the mode
If the above is detected, the mode of the previous period is changed to the plurality of triggers.
Mode data indicating the same mode as that of the previous period determined as the mode in the rack
Is less than half of the plurality, and the mode of the previous period is
Mode data indicating a mode different from the above is detected for a predetermined number or more.
Then, the mode data detected for the predetermined number or more is
Mode as the mode in the plurality of tracks
Mode data indicating the same mode as the mode of the previous period while being determined
Is less than half of the plurality, and the mode of the previous period is
Mode data indicating a mode different from the above is detected for a predetermined number or more.
If not, the mode of the previous period is
In the plurality of tracks according to the determined mode.
Performing digital signal processing of the information signal.
Digital signal processing method. 2. An information signal for a predetermined period is divided into a plurality of tracks.
Reproducing the information signal from a recording medium recorded by splitting
Or the information signal reproduced from the recording medium is received.
A digital signal processing method, wherein each track has a mode indicating a mode of the information signal.
Data is stored, and when detecting the mode data in each track,
The first and third in three consecutive tracks
Mode data are the same, and the second of the Tiger of the track
When the mode data of the lock is different from the first and third
The mode data of the second track is
Replaced by the mode data of the third track, and among the plurality of tracks after the replacement process,
The mode in the plurality of tracks can be changed
Determined as the mode indicated by the mode data detected most
In the plurality of tracks according to the determined mode.
Performing digital signal processing of the information signal.
Digital signal processing method. 3. The information signal is shuffled to form the duplicated signal.
Recorded in a number of tracks, and
Information on the plurality of tracks according to the selected mode.
When performing digital signal processing of the report signal, the error of each mode data in the plurality of tracks is detected.
Presence / absence is detected, and the determined mode and the stored mode data are detected.
Track is different from the mode indicated by the
For tracks where data error has been detected,
A process in which all information signals in a track are regarded as errors and processed.
The determined mode and the stored mode data.
Track is different from the mode indicated by the
Tracks for which no data error was detected
Changes the information signal in the track to the determined mode.
3. The method according to claim 1, wherein the processing is performed.
Digital signal processing method. 4. The information signal is shuffled to generate the information signal.
Recorded in a number of tracks, and
Information on the plurality of tracks according to the selected mode.
In performing digital signal processing of the notification signal, the determined mode and the stored mode data are stored.
For tracks with different modes than the mode indicated by the
There is a mismatch in any of the detailed items provided in the
All the information signals in the track
Process or consider the information in the track
Signal processing according to the determined mode.
3. The digital device according to claim 1, wherein
Signal processing method. 5. A digital signal processing apparatus according to the method described in any one of claims 1 to 4.