JPH0231384A - Recording and reproducing system for rotary head type pcm recorder - Google Patents

Abstract

PURPOSE:To shorten time delay due to recording and reproducing and to conclude a format with one or plural tracks on time series by dividing one track on a magnetic tape into 2.5 or 3 subblocks. CONSTITUTION:An area in the left of the center line of a subblock 49 corresponds to odd data Oi, and an area 61 in the right of this center line corresponds to even data Ei, and data is recorded from the top to the bottom with a symbol as the unit and recorded from the left to the right with a block as the unit. An error correction code is concluded with one subblock. Since the subblock has a concluded format, the unit of the time required to store data is the subblock, and this time is shortened in comparison with track conclusion where data is stored with a track as the unit. Since edition is performed in the part of the concluded track, the problem of discontinuity at editing points does not occur.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a PCM recorder using a one-rotation head,
In particular, the present invention relates to a recording and reproducing method suitable for recording and reproducing PCM audio signals together with video signals.

[Conventional technology]

The conventional method, as described in Japanese Patent Application Laid-Open No. 195703/1983, arranges even-numbered data and odd-numbered data on different tracks, and completes digital data within a certain time range in two tracks. Furthermore, error correction codes are recorded and reproduced on magnetic tape so that each track completes the recording process.9.

Generally, PCM audio signals have a high correlation between data in chronological order, even if one data is missing.

By performing average value interpolation etc. from the data before and after that,
It becomes possible to reproduce and output. The conventional method described above takes advantage of the above, and even if a burst dropout occurs on the magnetic tape or one head becomes clogged and one track cannot be played, the remaining data will be Apply mean value interpolation.

Audio output can be performed.

[Problem to be solved by the invention]

In the conventional method described above, two tracks are completed in one time series. Therefore, during recording, data for two tracks is input and then recorded on the magnetic tape, resulting in a time delay of two tracks. Also, during playback, the audio is output after all data on two tracks on the magnetic tape has been played back, so there is also a delay of two tracks. Furthermore, since the error correction is completed in one track, the above-mentioned time delay is even larger, and the total number of tracks is about 4 to 6. This time delay is not a problem in the case of audio-only recording and playback methods, but
VT that records and plays back digital audio signals along with video signals
This is a problem in R. In other words, while analog video signals are recorded and played back with almost no delay,
Audio is 67m to 90m in 4-6 track tNTsc system.
This caused a delay of up to 1000 m seconds, and the difference between the sound and the sound was clearly perceived.

Nineteenth, if you use an incomplete format.

Although it is possible to reduce the time delay, there are problems such as abnormal sounds occurring due to discontinuity at one editing point when performing editing such as splice recording.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording/reproducing method for a rotary head type PCM recorder that causes little time delay due to recording and reproducing and in which tracks are completed in chronological order with a plurality of tracks.

[Means to solve the problem]

The above objective is achieved by dividing the track of the magnetic tape into 2.5 or 5 m subblocks. The sub-block is separated into 4A number f-data and odd number data, and an error correction code is added to complete the error correction. Also, even data and odd data within the same sub-program and track are data in different unit times, and in one time series.

, to be complete with a track or multiple tracks.

Each sub-block is placed.

[Effect j] Each sub-block has its own complete format, so the time to store data is in units of sub-blocks.9. It is shorter than in the case of complete track storage, which stores data in units of tracks.

Also, in order to avoid impairing the playback ability against burst errors, even if either even data or odd data is delayed in units of sub-blocks, if the amount of delay is within a track, the delay will be can prevent an increase in

Additionally, the ninth has a completed track.

By performing editing in the completed track portion, the problem of discontinuity in the li convergence does not occur. Nine.

Error correction is completed within a sub-block.

Even if editing is performed on a portion other than the complete track, there is also the advantage of being able to perform error correction, cross-fading, etc.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

This figure is a block diagram of a VTR that records and reproduces F) PCM audio along with video signals using a deep recording method.

In the figure, 1 is a magnetic tape, 2 is a rotary head for video, 3 is a rotary head for audio, 4 and 5 are recording/reproducing selector switches, 6 and 8 are recording amplifiers, 7 and 9 are reproduction amplifiers, 11
12 is a video output terminal, 15 is a data bus, and 28 is an audio output terminal.

29 is an audio input terminal, and 50 is a rotating cylinder.

First, the above-mentioned VTRf)@ production will be briefly explained using FIG.

During recording, the analog audio signal 102 input from the audio input terminal is band-limited by the filter 27 and then output to the AD.
The D converter 26 converts it into a 16-bit PCM @ symbol. The switching circuit 25 is connected to the timing generation circuit 18Vc and the A/DR? Select either the right channel data (hereinafter referred to as R data) or the pressure damping data (hereinafter referred to as L data) of the A unit 26, and convert it into 2 bytes of data with 8 pits f per sample data. It is divided and output to the data bus 15, and 324
It is memorized to complete the sample. Next, according to the correction address circuit 17, parity for error correction is generated by the error) tr correct circuit 16 and written into the RAM 19.

Finally, according to the recording/reproducing address circuit 20, the RAM 19
The PCM audio signal and parity are read out.

A header circuit 14 adds a synchronization signal indicating the beginning of a block, and a modulation/demodulation circuit 15 modulates the signal.

After being amplified at a predetermined level tvi by the recording amplifier 6, the signal is transferred to the rotary cylinder via the recording/reproducing switch 4.

Deep recording is performed on the magnetic chip 11 using the rotary audio heads 3 installed at 50 Vc and 180 degrees opposite each other.

At the same time, a video signal is input from the video output terminal 11.

Processed by the video processing circuit 10 and recorded by the recording amplifier 8]
The video is amplified to a predetermined level, and then transmitted through the recording/reproduction switch 5 using the rotating head 2 for display.

Recorded on the surface layer of magnetic tape. At that time, the video signal is generally processed as much as the analog signal.

While the delay time from inputting to recording on the magnetic tape 1 is small, PCAI audio signals have a delay from inputting to recording due to code generation for the recording surface, etc. .

On the other hand, during playback, the magnetic tape 1 is
A good signal recorded in the deep layer of the . be remembered. vcK, the error data on RAIlhP is corrected using the error correction circuit 16 according to the correction address circuit, and the data address circuit 21 corrects the error data on the PC in a predetermined order.
The M audio data is read out and input to the interpolation circuit 22 via the data bus 15. The interpolation circuit 22 performs processing such as interpolation on the data determined to be uncorrectable by the error correction circuit 16.

The data is separated into L data and R data, converted into analog No. 1 data by a D/A converter 25, and after that, high-frequency components are removed by a filter 24 and outputted from an audio output device 28. At the same time, the video rotary head 2 reproduces the signals recorded on the surface layer of the magnetic tape 10.

The video output signal 12 is amplified to a predetermined level by the reproduction amplifier 9 and processed by the video processing circuit 10.
It is output as No. 8. In this case as well, the pCM audio code reproduced from magnetic tape 1 and Eitsu No. 1 at the same time are p
The delay time is longer for the cMf voice train. The delay between the reproduced PCM audio and the video signal is called a delay.

In addition, the error 9 correction in 11 VTRt/C is performed by correcting the error caused by the double-encoded read solo 7) code.
The first 0 correction is treated as a C“1 correction, and the second correction is treated as a 02 correction.

In addition, the sampling frequency of PCM audio is Nrsc
The method is 4&6KHtx/t, 001 #4&551KH
In the iiC"CIR method, the frequency is 48.6 KHz.

FIG. 42 and FIG. 3 show the recording format on the AQD 1 according to the present invention. FIG. 2 shows the NTSC system, and FIG. 3 shows the CCIR system. For each n, υ is odd number data, EL is even number data (L=0 to 14), and each 0. Each E consists of 30 blocks, and one block consists of 55 symbols (1 symbol=1 byte) as shown in FIG. In addition, in Fig. 4.

40 is a synchronization signal indicating the beginning of a block, and 41 is an ID in which access information, sampling frequency, etc. are recorded.

42 is a block address indicating the block position within the track, 43 is a parity that is the exclusive OR of ID 41 and block address 42, 44 is PCM audio data or 02 parity for C2 correction, and 45 is C1 parity for 01 correction. be. Also, from synchronization signal 40 to parity 4
The four symbols in 5t are called a header.

$2@ and as shown in Figure 5, odd number data CJA and even number data! 9 (/=0 to 14) constitutes an area consisting of 60 blocks, and this area will be called a subblock. , in the track, in the NTSC system, 2.5
d. In the CCIR method, five subblocks are arranged. The subscripts O and E are attached to one ridge of the time series, and the same subscripts indicate data within the same time. One QL block Ei- includes 324 samples each of L data and R data. Even data and odd data in a subblock are always p CM audio of different unit times.
It was 151, and there was a delay of 524 samples, resulting in 9 data. Maku, even data at the same time as 0φ50 is Eφ5
2 and is recorded on the magnetic tape 1 with a delay of 60 blocks. Also, in the NTSC system.

Even number data with the same timing as 0.55 is E, 54 of the adjacent track.2) The track is not completed because it is wrapped around the rack, but as can be seen from Figure 2, It has 6 tracks, 15 subblocks, and 4860 samples each for L data and R data, and has nine formats. In addition, in the CCIR method, from Fig. 5,
The track is complete. The above format is shown in FIG. 5 as a 6-1 complete subblock O, and a configuration of a portion O excluding the header. In the figure, an area 60 on the left side of the center line corresponds to odd number data 0J-9, and an area 61 on the right side corresponds to even number data EJ-, symbol by symbol from top to bottom.

Data is recorded in block units from left to right.

The Reed-Solomon code for C1 (the code sequence for f-correction (called the C1 sequence) is the same as the one-way F), R5t 51, 27.5), and the code sequence for 02 correction (
(referred to as '2 series') is horizontal.

This is a Reed-Solomon code of RE (30, 24, 7). The direction on the M95 time series is the C2 series direction.

As shown in FIG. 5, the error correction code is completed in one subblock.

By using the sub-track complete format as described above, it is possible to reduce video/audio lag. Hereinafter, the pleasant sound delay will be explained using FIG. 6. The figure shows recording and reproduction.

This represents the timing in sub-block units.

In the same figure, input data 102 and playback data IQ4
It is assumed that the subscript D↓ corresponds to the subscript in FIG. That is, it is DA Eb, OL, and consists of L and R52# samples. In addition.

C2 encode 70. (1'1 encode 71 indicates the generation timing of C2 parity 44 and C'1 parity 45, respectively. In the C2 encode 70 and below in FIG. 6, L only stores from 0 to 2; 9 is the same timing for A>!SVc, so it is omitted here.

During recording, C2 parity 44 is generated for Dφ to D of input data 102 at the timing of C2 encoding 70.

As shown in the original diagram, Oφ and R2 have a delay of one subblock (hereinafter, this delay time will be referred to as D).

If the sampling frequency is Fs, D=5247F8
seconds), 0. and Eφ are delayed by 2D from °C to C
32 encoded. When C2 encoding is completed for each valley, Ct parity 45 is generated at the timing indicated by C1 encoder 45. At this time, as shown in FIG. 5, since the Ct sequence and the recording direction match, once the 01 operation is performed in block units, it becomes immediately possible to record on the magnetic tape 1.
Recording is performed at the timing shown in 3. As a result of the above,
The tape recording timing is based on the heka timing of the audio data 102.

There will be a delay of τ8 (2D delay). on the other hand.

Since the delay time of the video signal is very small, the pleasant sound delay is τ
It becomes 8.

During reproduction, the reproduction signal reproduced at the recording and reproduction timing 103 is subjected to 01 correction at the timing indicated by Ct correction 72. After completing the C1 correction in sub-block units, the 02 correction is performed at the timing indicated by the C2 correction 73, and the data after the 02 correction can be output. Therefore, at the timing of the reproduced data 104, the data is output as an audio signal to the audio output terminal 28. It is output from As a result of the above, the playback output timing of the audio signal is τ
There will be a delay of F (2D delay). On the other hand, since the delay of the video signal is very small, the pleasant sound delay during reproduction is τP.

From the above, let r be the delay of audio with respect to video when recording and reproducing.

τ; τ凰+τ, = 4D, p, approximately 247 msec, which is less than 40% of the delay of the conventional method, and poses no problem in practice.

FIG. 7 shows the amount of delay for even data and odd data in subblock units. In the same figure, D
80 means performing a delay operation of D, and 2Dso means performing a delay operation twice that of D. It can be seen that all data undergoes a delay twice as much as D through recording and reproduction.

As described above, by using the present invention.

It becomes possible to reduce the delay in pleasant sound.

Furthermore, by arranging even data and odd data in different subblocks, even if data is missing in bursts due to dropouts during playback, it is possible to obtain good playback output by performing interpolation, etc. I can do it.

For example, if all the data in the 1.5 sub-pack areas 55 indicated by diagonal lines in the rlc2 diagram are missing -011h
El and O8゜■ Data is lost and the machining finish is "11"
-'・and El. ■The data is being reproduced normally, so the chevron is from Ell, E is from O, and O is from El.
It becomes possible to perform average value interpolation, etc. from l1. In other words, as shown in Figure 8, the data in the "il" that cannot be reproduced (data marked with an "X") and the data in the reproduced Ell (data marked with an "O") are arranged alternately in a time series. Because there are
01. By calculating the average value interpolation of the 11 pieces of data existing around 1, a good reproduction output can be obtained, and there is no need to apply Mi &-).

As stated above, when using the formats shown in Figures 2 and 85, jt lengths up to 1.5 subblock length (5/5 track length in the Nrsc method and 2 minutes in the CCIR method) are possible. Interpolation processing is possible for burst errors.

As mentioned above, the NTSC system has 6 tracks, CC
In the IR method, the track is completed, so when editing such as splice recording, by setting this trough completion point (solid line 56 in Figures 2 and 3) as the editing point, the IA collection can be edited. No problems arise due to point discontinuities. Therefore, for example, when this VTR is used as a recording/reproducing device for digital data other than audio, by configuring sectors using the above-mentioned complete range as the minimum unit, recording/reproducing access can be performed at will.

Furthermore, in the case of the NTSC system, broken lines 57 and 58 in FIG.
When editing with
-I'm in the middle of nowhere. For example, 01 of the track before broken line 57
The even data for El of the track after the broken line 57 is
The odd number data for E is located at the 0 position. Therefore, during playback, the E4 and Oge θ data are played back while interpolating missing data and gradually fade out, and the 04 and El data (around 1 edit point when editing is recorded). The data becomes temporal VC@, so No. 0 and E4 and No. 0 and El are no longer audio data within the same time range.)
are played back while interpolating the missing data and gradually fading in. It is now possible to perform so-called crossfades, which can produce special effects.

In addition, when editing on tracks other than those listed above.

It is preferable (
-No. In addition, as shown in Figure 2, in the CCIR method, the track is complete, so the loss fade as described above cannot be performed, but if the track break is shifted to make it non-complete as shown in Figures 8g and 9. , so the above crossfade is possible.

Depending on the situation, it is also possible to use the complete form and the incomplete form.

10 and 11 show other embodiments of the present invention; FIG. 10 is for the NTSC system, and FIG. 11 is for the CCIR system. Similar to the format in Figures 2 and 3, 2.5 tracks (NTSC)'! ftBs
Although it is divided into 111A (CCIR) o subblocks, each even number data and odd number data are arranged so as to be completed in 4 tracks in the NTSC system and 2 tracks in the CCIR system. (below.

This is called the format 4-2 completion method. ) $12 Figure 12 shows the recording and reproducing timing in nine cases using the above format. In the same way as the timing in figure g6, in this case, the 4D is the same as in the case of our 5.6-1 completion method.

However, FIG. 15 shows nine cases of slow abrasion operations for each even number data and odd number data, and it can be seen that all data undergoes 2D slow abrasion through recording and reproduction.

Nine, as mentioned above, 4 tracks are completed in the NTSC system, C
In the CIR system, two tracks are completed, so editing is completed using the solid line 56, and cross-fading is possible when editing is performed using the broken line 57.

As mentioned above, by using the 4-2 complete system, the pleasant sound delay is 4D (same as the case of the 6-1 complete system), the recording and playback is ciJi12 and V, and the NTSC system and CCI
In either R method, it is possible to perform complete editing and non-complete editing (crossfade is 1).

However, in the 4-2 completion method, the maximum burst error length that can be interpolated is 2/5 track length in the CNTSC method, and 3 in the CCIR method. minute, track length), which is 6
-Reduced to two-fifths of the one-complete method.

Note that in both the 6-1 completion method and the 4-2 completion method, even if the positional relationship between even and odd data is switched, the same effect as described above can be obtained.

The interleave format within a subblock will be described below.

FIG. 14 shows the IPI of the data arrangement within the sub-block. In the figure, L is the data of the left channel, R is the data of the right channel, the numbers in each subscript indicate the chronological order, and 1 is the data of the upper 8 bits of the 16-bit sample data, and 1 is the data of the lower 8 bits. This is bit data. I think Qφ~Q is C2 parity, Pφ
~PM! 'j (' 1 parity 45, 5th parity
As shown in the figure, the C1 series consists of 31 symbols in the vertical direction, C
The second series is 30 symbols in the horizontal direction.

Ma2. The numbers shown above and below the block are block addresses 42 in FIG.

As shown in a rectangular area 141 in the figure, the data of one sample of the left channel and the right channel are arranged so that the upper and lower parts are arranged vertically, and the R and L are arranged horizontally. Even number data and odd number data are 6 each to the right from
One sample data is sequentially arranged in the direction from the top to the bottom 27 sample data. By doing this, it is possible to make the C2 series and the time series substantially coincide with each other, and to make the data in the time series disjoint with respect to the recording direction. Also, 1 pool a
Since the block contains the upper and lower parts of one PCM audio data, even if a burst error occurs in a block unit, the effect on the reproduced audio signal can be halved. For example, 5. 20 symbols cannot be played within one block. Even if correction is not possible even if CI correction or 02 correction is performed, the sample data to be interpolated is 10 words (
1 word = 16 bit sample data).

In addition, in the case of this interleaved format.

Since only one block of VCL data or only R data is included, if all the data in one block becomes erroneous and interpolation is performed, there is a risk that the amount of interpolation will be concentrated on one channel, resulting in significant deterioration of sound quality.

The 9 format shown in Fig. 15 solves the above problem, and replaces L data and R data every 3 sample data in the vertical direction (for example, data in the area indicated by 150), and stores data within one block. Contains data for both channels. In this format, even if one block is all interpolated amount.

By distributing the signals to both the L and R channels, it is possible to alleviate sound quality deterioration.

In both Figures 14 and 15.

The 1-hour regions on the left and right sides of the center are different, so they are not continuous in the time series. For example, O in Figure 2
If we take the sub-blocks formed by φ and El into columns, the data Oφ in the left area is the data E1 in the right area.
The data is at time t, delayed by 524 samples, and the number of subscripts is also 524 fewer than in the same figure, but here, for the sake of simplicity, the above series characters are expressed as numbers in the 524 digit modulus. . Also, in the same figure, position 1' of L data and R data, or upper data and lower data! Even if the relationship is reversed, there will be no difference in the above effect.

By the way, in the above format, since the CI is completed in one block, the time between C1 encoding, tape recording, tape playback, and 01 correction can be reduced to the minimum, but during playback, an error may occur in the header shown in Figure 4. If this occurs and the block address 42 is incorrectly detected, there is a risk that each block will be judged as data at a different location, and C1
C1 correction is performed normally for the series. On the other hand, the interpolation process performed by the interpolation circuit 22 is generally performed only on those that cannot be corrected with 02 correction, and cannot be corrected with 01 correction, or that have undergone false 9 correction. If a different block address is determined, and C1 correction shows no error, but C2 correction makes it uncorrectable, it will be output without being interpolated. However, since it is reproduced at a position different from the original position, the ratio value will be different from the data around 2, and there is a risk that abnormal sound will be generated.

As a means to solve this problem, add block address 42 to the CI series and read/write R5 (52, 28, 5).
There is a method of forming a 7amon code and, when an error is detected in a block address, treating it as (:'Iff).

9. As shown in C1 series 160 and 161 in Fig. 16, Ct parity 45 is exchanged and added to the upper and lower two blocks.
By adopting a format in which two symbols out of the four symbols of one parity 45 are exchanged over the upper and lower two blocks, when a block address is erroneously detected, C1 cannot be corrected, and the above problem can be solved.

In the above description, the sampling frequency of the pcMf audio was set to 4a6KHz (or 48.6KHI), but it is also possible to handle PCM audio with a lower sampling frequency by inserting dummy data. Even if the sampling frequency and the rotating head frequency are out of sync, this can be handled by making adjustments by increasing or decreasing the amount of data recorded in the track.

For example, similar effects can be obtained by using the present invention for PCM audio having sampling frequencies such as 48 KHz, 4 TL KHz, and 52 KHz.

[Effect of the Invention J According to the present invention, in a device that records and reproduces a PCM audio signal together with a video signal, the recording and reproduction are completed in chronological order within a time range shorter than the track, thereby reducing the delay in pleasant sound that occurs during recording and reproduction. effective.

(9) Since even data and odd data within the same time range are recorded in different areas, the maximum burst error length that can be interpolated can be increased.

Furthermore, since there are tracks that are completed and tracks that are not completed in one chronological order, it is possible to arbitrarily select between complete editing and non-complete editing, especially when performing non-complete editing.

Operations such as close fades are possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a VTR using the present invention. 2, 5, 9, 10, and 11 are recording format diagrams for tapes according to embodiments of the present invention.
The figure is a block diagram, and Figure 5 is a schematic diagram of sub-blocks.
6 and 12 are timing charts for recording and reproduction, FIGS. 7 and 15 are block diagrams showing delay operations, and FIG. 8 is an explanatory diagram of interpolation. FIGS. 14 and 815 are detailed diagrams of the format within the sub-block, and FIG. 16 is a diagram showing another example of the C1 series. 49...Sub block. 56...Complete editing point. 57.58...Incomplete editing point. 46...Block. 44...PCM or C2 parity. 45...C1 parity 42...Block address. Figure Figure Figure Collection District Collection Figure Collection // Bi Figure! + 11--E,. × −0jl Map of the map

Claims (1)

[Claims] 1. Recording and reproducing a video signal and a PCM audio signal using a rotating head, performing error correction to correct errors in the PCM audio signal during reproduction, and generating the error correction code during recording. This is a recording and reproducing method for devices that perform PCM audio signals, in which one track on a recording medium is divided into 2.5 or 3 sub-block areas, and the sub-blocks contain even-numbered data, which is the even-numbered data of the PCM audio signal. Including part and above PC
The even data and the odd data included in one sub-block are data in different time ranges, and each sub-block A rotating head type PC characterized in that the error correction code is completed within a block.
Recording and playback method of M recorder. 2. If one track is divided into 2.5 sub-blocks, it will be completed in 6 tracks.
2. The recording and reproducing system for a rotary head type PCM recorder according to claim 1, wherein each sub-track is arranged so that when divided into sub-blocks, each sub-track is completed in one track. 3. If one track is divided into 2.5 sub-blocks, it will be completed in 4 tracks, and if the track is divided into 3.
2. The recording and reproducing system for a rotary head type PCM recorder according to claim 1, wherein each sub-track is arranged so that when divided into two sub-blocks, each sub-track is completed in two tracks. 4. When D is the time required to input or output the same amount of audio signal as the PCM audio signal recorded in one sub-block from the outside, a certain time range D
τ_
R_O, the time from when it is reproduced from the recording medium until it is output as an audio signal is τ_P_O, and after odd data, which is the odd-numbered data of the audio signal within the same time range D as above, is input from the outside. It is characterized by the following relationship: τ_R_O≠τ_R_E τ_P_O≠τ_P_E τ_R_O+τ_P_O=τ_R_E+τ_P_E, where τ_R_E is the time until it is recorded on a recording medium, and τ_P_E is the time from when it is reproduced from the recording medium until it is output as an audio signal. 2. A recording and reproducing method for a rotary head type PCM recorder according to claim 1. 5. When S is an arbitrary integer, during recording, odd number data (or even data 1) in the time range of (3S)D to (3S+1)D from a certain point in time is D, even data 1 (or odd number Data 1) is delayed by 2D and (3S
+1) Odd data 2 (or even data 2) in the time range from D to (3S+2)D is delayed by 2D, even data 2C or odd data 2) is not delayed, (3S+2)
)D to (3S+3)D Odd number data 3 (or even number data 3) is not delayed, and even number data 3 (or odd number data 3) is delayed by D before being recorded on the recording medium, and during playback, the above After being reproduced from the recording medium, the odd data 1 (or even data 1) is delayed by D, the even data 1 (or odd data 1) is not delayed, and the parsimonious data 2 (or even data 2) is delayed. Without delay, the even data 2 (or odd data 2) is delayed by 2D, and the odd data 3 (or even data 3) is delayed by 2D,
The rotating head type PCM according to claim 4, wherein the even number data 3 (or the odd number data 5) is delayed by D.
Recorder recording and playback method. 6. When T is an arbitrary integer, during recording, odd number data 4 (or even number data 4) within a time range of (2T)D to (2T+1)D from a certain point in time is set to D, and even number data 4 (or Odd data 4) is delayed by 2D, and (2
Odd data 5 (or even data 5) within the time range from T+1)D to (2T+2)D is delayed by D, even data 5 (or odd data 5) is recorded on the recording medium without delay, and during playback, , after being reproduced from the recording medium, the odd data 4 (or even data 4) is delayed by D, the even data 4 (or odd data 4) is not delayed, and the odd data 5 (or even data 5) is D. The rotating head type PC according to claim 4, wherein the even number data 5 (or the odd number data 5) is delayed by 2D.
Recording and playback method of M recorder.