JPS59154616A - System and apparatus for recording digital signal - Google Patents

Abstract

PURPOSE:To decrease adverse effect given onto a peripheral device as much as possible even if a recording medium is reproduced by a wrong method by recording a sound signal with a prescribed bit from a high-order bit of a digital signal and recording a data signal with a low-order bit. CONSTITUTION:An analog sound signal time-compressed to 1/8 is reproduced at an analog sound reproducing device 50, a data is coded digitally at a digital data processing device 51 and the analog sound signal is converted digitally at a voice and data signal processing device 52 and applied to a signal recorder 53 together with a digital picture signal from a digital recorder 54. Further, a time- compressed sound signal is recorded to a high-order 12-bit of Ch-1 and Ch-2 and the digital data is recorded to a low-order 4-bit and a digital picture signal is recorded to Ch-3 and Ch-4. Even if the recording medium recorded in this way is reproduced as a sound signal in error, since the data signal is reproduced as pulsive noise having a high level, a peripheral device of the reproducing device is hardly destroyed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a digital signal recording method and a recording device thereof, and more particularly to a method and device for recording audio signals and data.

(Purpose of R-light) The present invention provides a method for converting a B re-signal and, if necessary, still and city image information into digital signals and adding a data signal to the recording medium on which the C-recording is performed. Playing recording media using the wrong H method can have negative effects on peripheral devices ()
The purpose of this invention is to provide a recording method and device that requires less cover.

(Technical Background of the Invention) The present applicant has previously disclosed that a type information signal is recorded on a spiral rack without forming a side groove,
In addition, the first and second transformers, which are at frequencies lower than the recording frequency band of the main information signal and which are very different from each other, are connected to a reference signal for control (hereinafter referred to as [1
-Ranking (No. 11) fpl and fp2 are alternately switched every rotation period of the disk to form a sub-track approximately in the middle between the track center lines of adjacent main tracks for recording. and fpl and fp
Digital signal recording using a disk with an electrode function is performed at the switching connection part of No. 2, in which the third tracking signal fp3 is recorded on the main track at a level higher than a predetermined level so as not to affect the main information signal. proposed a method.

In this proposed digital signal recording method, a four-channel digital signal transmission path is provided, and two-channel audio signals and two-channel still image signals are transmitted.

Figure 1 is a block diagram showing an example of the system on the recording side of the above recording method, where 1 and 2 are input terminals into which two channels of analog audio signals are input separately, and input terminal 3 is a block diagram showing an example of the system on the recording side of the above recording method. A cue signal is input to the input terminal 4 each time the music program of the analog audio signal is switched from the previous music program to another music program.

Assuming that a digital signal with a sampling frequency of 44.1 kiIZ and a quantization number of 16 bits is recorded in one track in time series for four channels as the information amount of one channel on the disk 11 to be described later, the above The two-channel analog audio signal is sampled for each channel by the AD converter 5 at a sampling frequency of 44.1 kHz.
In addition, a digital audio signal with a quantization number of 16 bits (PCM
The signal is converted into an audio signal) and supplied to the signal processing circuit 6.

Further, a control signal generated by the control signal generation circuit 7 is supplied to the signal processing circuit 6. The control signal is used for position control (random access) of the pickup reproducing element, etc.

Furthermore, the digital recorder 8 records a digital image signal in a signal format as shown in FIG.
This digital image signal is reproduced and supplied to the signal processing circuit 6. Here, the digital double-image signal is transmitted at a platform of 68°C (H1 to H684°C) shown in Figure 2 for transmitting one field.
4 header signals and Yi, Y2, Y3, Y in Figure 2.
4, . . . (RY)1, (13-1'>1).

First, to explain the component encoded signal,
Number of scanning lines: 625, horizontal scanning frequency: 15.625kHz
Of the color video signal for one frame, only the signal of the video period is sampled and quantized with a sampling frequency of 9MLlz and a quantization number of 8 bits for luminance (Y-5), and two types of color difference signals (R- Y) and (B-Y) are respectively sampling frequencies 2.
It is sampled and strung at 25 MHz with a frequency of 8 and 1. The digital luminance signal has a number of sample points per scanning line (
In the case where the number of pixels is 456, and the number of pixels is 456, and the number of effective scanning lines is 572 for one frame, the signal has 572 effective scanning lines.

The above-mentioned digital luminance signal and two types of digital color difference signals are respectively written into a memory circuit (not shown), and further, by a readout control signal of a predetermined frequency, the digital luminance signal is converted to a sampling frequency of 88.2 kHz and a quantization number of 8 bits. The two types of digital color difference signals are also read out at a sampling frequency of 88.
．． The signal is read out at 2 kHz and quantized to 8 bits and applied to a switching circuit (not shown).

This switching circuit uses a separately generated sampling frequency of 44.1
kHz. A header signal with a quantization number of 16 bits is supplied, and a switching circuit switches each of these input digital signals in a predetermined order to generate a digital image signal for one field in a signal format as shown in Fig. 2. This is then recorded on the digital recorder 8 shown in FIG.

The signal processing circuit 6 in FIG. 1 receives a digital image signal in the signal format as shown in FIG. The parallel data is rearranged into serial data, the digital signals of each channel are divided into predetermined intervals, and they are interleaved and time-division multiplexed. Further, an error code correction signal, an error code detection signal, and a synchronization signal bit indicating the start of a block (frame) are added to form a recording signal.

FIG. 3 is a diagram schematically showing an example of one block (one frame) in the recording signal generated as a result of signal processing by the signal processing circuit 6, and one block is composed of 130 bits. . In the figure, SYNC indicates the multiplexing position of an 8-bit fixed pattern synchronization signal indicating the beginning of a block, and Ch-
1 and Ch-2 indicate the digital audio signals of the two channels, and Ch-3 and Ch-4 indicate the multiplexing positions of 16 bits and 1 word of the digital image signals of the two channels.

Further, P and Q shown in FIG. 6 are 10-bit error code detection signals, for example, []-W1■W2■W3■W4(1) Q=T4・Wi■T-3-W2sT2-W2O- “・W
4(2) This is a signal generated by the formula: However, (1),
(2) In the formula, Wl, W2. W3. W4 is Ch-1~C1
1 to 4 16-bit digital signals (usually digital signals in different blocks), T is an auxiliary matrix of a predetermined polynomial, and ■ indicates addition modulo 2 for each corresponding pit.

Furthermore, in FIG. 3, CRC is a 23-hit error code detection signal, and Ch-1 to Ch-4 arranged in the same block,
I], Q, for example, X-! 3+Xゝ+-X'+
This is the 23-bit remainder obtained when dividing by the generator polynomial where X41<J. When the remainder is zero, it is used to detect that there is no error. Also, in Figure 6, Δ
dr is a control signal used for random access, etc. Each bit of data is distributed and one bit is transmitted in one block. For example, all bits of the control signal are transmitted by 196 bits (that is, the control signal is 196 bits). (composed of bits).

Further, U is two reserved bits called user's bits. One block of signals is composed of a total of 130 bits from SYNC to U shown in Figure 3, and the digital signal is synthesized in units of this block at the same frequency as the sampling frequency of the digital audio signal, for example 44.1kHz. The data is transmitted serially to a disk 11 via a modulation circuit 9 and a recording device 10 using a laser beam.
recorded in Therefore, the number of rotations of the disk 11 is set to 900.
rpm, 2940 blocks are recorded and reproduced per one rotation of the disk, so the above 196-bit control signal is recorded and reproduced 15 times during one rotation of the disk.

The modulation circuit 9 modulates the digital signal from the signal processing circuit 6 using, for example, a modified frequency modulation (MFM) modulation method, or performs random addition by, for example, adding the M-sequence code and 2 to 1. After that, the carrier wave of, for example, 7 MHz is frequency-modulated to obtain a frequency-modulated signal. Further, the recording device 10 records data using a first modulated light beam modulated by a frequency modulated wave signal of a modulation circuit 9.1 and a second modulated light beam modulated by a tracking control reference signal. The photosensitive agent layer of the "master disc" is irradiated, and a stamper disc is created through a well-known development process and a disc making process. The disc 11 is copied by this stamper board.

This disk 11 is a bit string in which a frequency modulated wave of a signal obtained by chronologically synthesizing a digital audio signal and a digital image signal constituting one block in the signal format shown in FIG. 3 in block units is intermittent. The spiral main track recorded as A sub-track is formed by a bit string in which the first and second tracking control reference signals fp1 and fp2 on a burst of one frequency are intermittent, and
A third tracking control reference signal fp3 is recorded in the main track at the switching connection portion of pi and rp2. Further, this disk 11 does not have a guide groove for tracking the reproducing needle, and has an electrode function.

The component encoded signals in the digital image signal recorded on the disk 11 are composed of one field of pixel data arranged in a checkered pattern on the screen. In addition, on the disk 11, component encoded signals related to a plurality of color still images are recorded corresponding to "Gorakubu 1" Duram, but these are all composed of the pixel data arranged in the above-mentioned checkerboard pattern. Is there a coded signal for one node consisting of a group, or one coded signal?
No. 1 No. 1 = 1 No. 1 ~ τ] What is the coded signal?

Next, a reproducing device for reproducing digital images recorded on the disc 11 will be explained. FIG. 4 shows a block system diagram of an example of the playback device of tJ.

In the figure, the disk 11 is placed on a turn (not shown) and rotated at 900 rpm, so that the bottom surface of the playback button 18 slides on the surface of the disk 11.

Reproduction 1118 is fixed at one end of campreper 19;
A +51 permanent magnet 20 is fixed to the base side of the other end of the cam lever 19. The part of the cantilever 19 to which the permanent magnet 20 is fixed (is surrounded by the jitter correction T]ile 22 fixed to the reproducing device. A magnetic field is generated in a direction perpendicular to the magnetic field direction of the permanent magnet 22 t! , 1st, 1-racking ribo circuit 23
J, Rino] - The Cambu lever 19 is displaced in one direction in the track width direction according to the polarity of the racking error No. 13, and by an amount of displacement I, according to the person's height.

In response to the fact that the capacitance formed between the disk 11 and the capacitance 10k (not shown) fixed by vapor deposition on the rear end surface of the playback disk 118 changes in accordance with the successive rows of pins. A resonant circuit whose resonant frequency changes, a circuit which applies a high frequency electric current of a constant frequency to this resonant circuit, and a circuit which detects the high frequency signal whose amplitude changes according to the change in the capacitance from the resonant circuit. circuit and this amplitude-detected high-frequency signal (
The high frequency reproduction No. 13 taken out from the pickup circuit 24 consisting of a circuit for pre-amplifying the reproduction signal (reproduction signal) is an FM
It is supplied to the demodulation circuit 25, where the main information of main 1 to rack 3 (here C is the f-digital sound 111 signal and the digital image signal synthesized in time series) is demodulated, while the The part is branched and t = Lucking Ribo circuit 23
supplied to

The 1-shoes 1ning servo circuit 23 receives the first to third tracking control reference signals 8 [p1
~rp3 is frequency-selected and extracted, and both reference signals fp1
, the 1-racking error signal obtained by differentially amplifying the envelope detection output of fp2 is applied to the 1-racking-1 to il-2
Output to 1. However, rpl for 11~Rack,
Since the positional relationship B of fp2 changes every rotation period of the disk 11, the switching pulse J, which is generated based on the detection horn of the reference signal Qrp3 for racking control, has a polarity of J and racking. or each rotation of the disk 11. In addition, the 1'' lagging servo circuit 23 connects the input 6NY2G to the input 6NY2G.
When J comes in, press play button 18 or 1 depending on the appearance.
The wheels 1 to 11' are driven so as to be forcibly moved in the track width direction by a track length or more.

On the other hand, [7N4 demodulation circuit 25! A time-series composite signal of the extracted demodulated digital signal (, (A":" - 27), where it is MFM decoded as shown in Fig. 3) - Matsu 1. After that, based on the synchronization signal bit 5YNC, the signal block (the beginning of one block is detected and the serial signal is -) is converted into a 6-column signal, and further error detection is performed.Only when an alternative is detected, The error signals are corrected and restored using the error correction signals P and Q.

In this way, if necessary, the correction and restoration can be performed (j4 [we have erroneous FIl(), and (Ni+'3 array is returned to its original order before interleaving. Of the two 1-1-channels, each of the two 1-1-channels has a digital height of 7 h, with 16 tunnels, and the I)△ exchanger in the data 27 causes the ab(]g signal 18. After being converted to output terminals 728 and 29, the output terminals 728 and 29 output signals J' for each person.The pick-up control signals J and J are output to a predetermined circuit (not shown) for high-speed position retrieval.

On the other hand, the i-digital l7Iii image signal g of IHlif:3-A-nts1- shown in FIG. The line number variable I angle 1fη path 30 is supplied, where the number of scanning lines is 62.
Converts from 5 horn type to 525 horn type.

As shown in FIG.
To SC method? This circuit is necessary only for a playback device that plays back analog color image signals with a V-according system, and is unnecessary for playback devices that playback and output analog color image signals that comply with the 625-scanning-line PAL system or the SECAM system. It is a circuit. However, depending on the playback device, a changeover switch is provided to change the input/output of the scanning line number conversion circuit 30, and the circuit 30 is switched between operating and non-operating depending on the number of scanning lines of the television system to be played back. Good too.

The output pixel data of the scanning line number conversion circuit 30 is supplied to a field memory 37 or 38 by a switch circuit 31.

The digital image signals which are sequentially and chronologically extracted from the rough decoder 27 in the signal format shown in FIG. . The synchronization number 13 detection circuit 32 detects the synchronization signal in the header signal and supplies the detection signal to the control circuit 33. 4
, the header signal detection circuit 34 discriminately reproduces each code signal and address signal other than the sync signal in the header signal and supplies it to the control circuit 33.

The control circuit 33 is supplied with each code detection signal such as the synchronization No. 1 detection signal and the header signal, and furthermore, the control circuit 33 is supplied with the above synchronization No. 1 detection signal and each code detection signal of the header signal. (which can be selected arbitrarily when different images are recorded) are supplied from the input terminal 36, these input signals are discriminated and decoded, and the scanning line number conversion circuit 30 and the switch circuit 3
1. Controls the memory write controller 35, switching circuit 40, etc.

The memory write controller 35 writes the field memory 37 or 38 based on the address signal in the header signal.
The accumulated image data in the digital image signal supplied to the controller is written to a predetermined address, but header progress is controlled so as not to be written. The switch circuit 31 supplies the digital image signal to the field memory 37 or 38 designated by the memory write designation code in the header signal.

The field memories 37 and 38 are connected to the read control signal from the memory read controller and the synchronization signal generation circuit 39, and simultaneously read out the reproduced pixel data for one field that has been written. Also correct. Here, the digital luminance signals read out from the field memories 37 and 38 have a sampling frequency of 9 MHz.
, the quantization number is 8 bits, and the first and second digital color difference signals are each read out at a sampling frequency of 2.25 MHz and a quantization number of 8 bits, and are supplied to the switching circuit 40. The pixel data of the digital luminance signal is output to the DA converter 41, and the pixel data of the two digital color difference signals are output to the DA converters 42 and 43. Ru.

The analog luminance signal D taken out from the DA converter 41
Color difference signals (13) taken out from A converters 42 and 43
-Y) and (RY) are taken out from the memory read controller and the synchronous IS signal generation circuit 4', and the horizontal and vertical synchronization signals and the color perspective 1 signal are respectively supplied to the encoder 44. After the color image signal is generated in accordance with the NTSC system, it is outputted from the playback output terminal 45 to a monitor color television receiver (not shown), and the audio signal that is played back and sounded is useful for listening to music. It is displayed as a color still image or partial moving image as supplementary information.

The above recording medium has a storage capacity of 2.54 Gbytes when viewed as a digital signal recording medium.

That is, the sampling frequency is 44,100 Hz, the number of bits per channel is 16, the number of channels is 4, and the playback time is 360.
Since it is 0 seconds, the storage capacity of one side is the product of these, and since it is double-sided recording, the total storage capacity is 218 of these products and 4r, 44100 x 16 x 4 x 3600 x
2=20.32 (Gbit, )=2. ! i4(Ql+y
+e) becomes.

Furthermore, the color still image signal mentioned above has a rate of 2.2 mm per frame.
It will be transmitted in 4 seconds.

(Problems to be solved) Using such an already proposed recording method, a still image and a corresponding audio explanation are recorded, and then the specified data is converted into a digital signal and added to the audio signal transmission channel. It is possible to use this for educational purposes or as a data file. However, when data converted into a digital signal is recorded on an audio channel, if it is played back as is with a normal playback device,
Since the data portion is reproduced as a large-amplitude pulse-like signal, there is a risk of damaging peripheral equipment of the reproduction device, such as a speaker, a power amplifier, etc., which is not preferable.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a recording method for recording digitalized audio signals and data signals, in which the audio signals are The data signal is recorded using predetermined bits, and the data signal is recorded using the lower bits of the digital signal.

(Example) FIG. 5 schematically represents the format of the audio signal, digitized data signal, and still image signal recorded by the recording method of the present invention, and basically the format of the third
Using the format shown in the figure, the Ch-1 and C
The audio signal is time-compressed and recorded in the upper 12 bits of each h-2, and the digitized data is recorded in the lower 4 bits. In addition, for Ch-3 and Ch-4,
The still image signal is digitized and recorded in the same manner as described in conjunction with FIG.

One type of data is recorded every 3 seconds of playing time,
A guard band G of 0.1 seconds is provided before and after this 3 seconds, and the audio signal is transmitted to the upper 12 bits of the first channel.
ia and the upper 12 bits Ch2a of the second channel are used to record for 2.8 seconds, and the digital data is recorded using the lower 4 bits Ch-1b of the first channel and the lower 4 bits of the second tunnel.
The still image signal was recorded for 2.8 seconds using bit Ch-2b, and the still image signal was recorded using Ch-2b in the same format as the previously proposed method.
Record one frame for 2.4 seconds using -3 and Ch-4. The remaining 0.4 seconds of Ch-3 and Ch4 record the control mode, etc. as a preliminary mode.

The 0.1 second guard bands on both sides are 3 on the master tape.
This corresponds to one frame, and is provided as a margin when connecting recorded signals during editing, so that editing can be performed easily.

The audio signal is assigned 12 bits from the most significant bit of Ch-1 and Ch-2, and its sampling frequency is:
It is set at 11.02kHz (=44.1/4kHz), and can be transmitted up to approximately 5kHz, and is transmitted with 1/4 the number of bits in proportion to the previously proposed method.
Since it is recorded in monaural sound, it is 22.4 (= 2,8 x 8
) seconds (uncompressed).

Note that the sound quality of audio in the 5kHz transmission band is approximately the same as that of AM broadcasting, and for reference, the transmission band of a telephone is approximately 3K.
It is about Hz.

Digital data is transmitted at 4+4=8 bits=1 byte/sample, and is sent twice in consideration of the case where errors cannot be corrected. The amount of data in this case is 61.74K bytes (=44100 x 2,8/2), which is about 30,000 characters (about 70 minutes in the specification) if one kanji character is 2 bytes.

The still image signal is recorded at 2.4 seconds/frame in the same format as in the previously proposed method. 0.4 seconds (70,56 seconds) behind the recorded portion of this still image signal.
It has a spare code of Kby1-), which is used as a control code, etc.

FIG. 6 is a block diagram showing a schematic configuration of an embodiment of the digital signal recording method of the present invention, in which the analog audio playback device 50 is, for example, a recorder, and records analog audio signals recorded in real time. The tape is played back by running it at eight times the recording speed, and an analog audio signal compressed to one-eighth of the time is played back.

The digital data processing device 51 is a device that generates necessary digital data, and outputs a digital data signal obtained by digitally encoding data such as a detailed description of a still image, for example.

The outputs of the analog audio playback device 50 and digital data processing device 51 are supplied to a high voice and data signal processing device 52, where the analog combined voice signal is converted from analog to digital to a digital audio signal. , it is converted into a signal format in which the audio signal is encoded in the upper 12 bits and the data signal is encoded in the lower 4 bits, and is supplied to the signal recording device 53.

On the other hand, in the digital recorder 54, a digital image signal of 18 minutes per frame and preliminary data of 0.4 seconds are recorded in advance in the above-mentioned format, and these signals are reproduced and outputted to the signal recording device. 53.

The signal recording device 53 is supplied with these signals and creates and records one data portion of 3 seconds. Create and record data one after another ten times.

The signal recorded by this signal recording device 53 is recorded on a recording medium by a recording device similar to the recording device in the above-described recording method, thereby completing a recording medium on which digital signals are recorded.

FIG. 7 is a block diagram showing an example of a reproducing apparatus for a recording medium recorded by the method of the present invention, and the same parts as the previously proposed reproducing apparatus shown in FIG. is omitted.

This playback device has substantially the same configuration as the proposed playback device shown in FIG. 4, but must have a 1/8 speed playback function. This 1/8 speed nail regeneration function is a function that reduces the radial feed speed of the regeneration needle and repeatedly regenerates the same location eight times.

During playback, first, specified information is searched by random access and playback is started from a predetermined location. Next, 3 seconds of playback is performed to capture the still image signal into the field memories 37 and 38, and the digital data signal is captured into the data memory 46. After 3.3 seconds of playback, the still image signal and digital data are captured. Once completed, return to the predetermined location and 1. While performing /8 speed playback, the audio signal is stored in the audio memory 47 for each track, and the audio is time-expanded by reading it out. The user issues appropriate instructions according to the captured data, and the playback device performs appropriate operations accordingly.

In the figure, 48 is an output terminal of the data memory, and 49 is an output terminal of the audio memory.

It is also possible to capture the entire audio signal into the audio memory during the first 3 seconds of playback, but if you do this, the audio memory will also have a large capacity, but as mentioned above, 1
If you extend the time while performing /8-speed general playback, you only need to provide memory for I/15 seconds.
It is also economical as it increases memory usage efficiency.

Further, when the recording medium recorded in the above embodiment is reproduced again using the reproduction apparatus according to the previously proposed method, the Shizui image will be reproduced normally because it has the same format.
The audio signal is the same as playing at 8 times the speed, making a so-called kyurokuro sound, but the quality as an audio signal is maintained, and the digital data is the lower 4 bits of 16 bits. Therefore, compared to the maximum level of the audio signal, the level is (24-1)/(2-1>,
This corresponds to approximately -72 dF3, which is only a slight increase in the noise level.

Therefore, even if a recording medium recorded in accordance with the following embodiment is erroneously reproduced by the reproducing apparatus of the method generally proposed,
There is no risk that digital data will be reproduced as high-level Halsian noise and damage peripheral devices such as speakers and power amplifiers.

Note that in the above embodiment, the digital data signal was recorded using the lower 4 bits of the audio signal channel, but this is not limitative. It goes without saying that the number of bits can be used, and the signal format can also be changed as appropriate, limited to those in the above embodiments.

In addition, the terms "upper bit" and "lower bit" in this specification are used to mean that when a digital signal is converted into an analog signal, the higher voltage is converted as higher voltage, and the upper bit is converted as lower voltage. The lower bits are the lower bits, and do not necessarily have to match the bit positions in the memory or format.

(Effects of the Invention) According to the recording method of the present invention, the audio signal is recorded using predetermined bits from the higher bits of the digital signal, and the data signal is recorded using the lower bits of the digital signal. Therefore, even if this data signal is played back as an audio signal by mistake, there is no risk of the data signal being played back as high-level pulse noise and damaging the peripheral equipment of the playback device, and the audio signal is time-compressed. A means for increasing the amount of audio information by recording, and further for obtaining a time-compressed audio signal by reproducing the audio signal recorded in real time at a faster speed than when it was recorded;
means for obtaining a digital signal by supplying the time-compressed audio signal and data signal, digitizing both signals such that the audio signal becomes the upper bits and the data signal becomes the lower bits; Since the time-compressed audio signal can be obtained by a simple means such as playing back the tape of a tape recorder while fast-forwarding, Compared to the case where time compression is performed by loading the audio signal into memory, thinning it out, and reading it out, the configuration is simpler, and the time-compressed audio signal can be obtained using almost all existing equipment. There are many advantages.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of the system on the recording side of the previously proposed recording method, Figure 2 is a diagram schematically showing the signal format of a digital image signal, and Figure 3 is a diagram showing the internal structure of the recording signal. A diagram schematically showing an example of one block (one frame) of
FIG. 4 is a block diagram of an example of a playback device using the previously proposed method, and FIG. 5 is a schematic diagram of the formats of audio signals, digitized data signals, and still image signals recorded by the recording method of the present invention. FIG. 6 is a block diagram showing a schematic configuration of an embodiment of the digital signal recording method of the present invention, and FIG. 7 is a block diagram showing an example of a reproducing apparatus for a recording medium recorded by the method of the present invention. It is. G...guard band, Ch-1a...upper 12 bits of the first channel, Ch-2a...upper 12 bits of the second channel, Ch-1b...lower 4 bits of the first channel, Ch- 2b...lower 4 of the second channel
Bit Ch-3...3rd channel, Ch-4...
4th channel, 50...analog audio playback device, 5
1... Digital data processing device, 52... Audio and data signal processing device, 46... Data memory, 47.
...Voice memory, 54...Digital recorder Fig. 4 Fig. 5 Fig. θ

Claims (3)

[Claims] (1) The recording method for recording the voice signal and the 7'-event signal that has been converted into a digital signal is used.
A digital signal recording method characterized in that the data signal is recorded using lower pitches of the digital number 1,1. (2) The audio signal is subjected to time compression 1. Digital IgS according to claim 1 recorded by recording method 3
゜ (3) In order to reproduce the blind voice recorded in real time with recordability and even faster speed, there is a means for reproducing the time-compressed sound 1h signal, and the time-compressed 11 voice signals and data (, HR3, and
Digitize the digital signal so that it is input to 1
A digital signal recording device comprising a stage and means for recording the digital signal.