JPS60136958A - Data recording method - Google Patents

Abstract

PURPOSE:To decrease the redundancy and to attain ease of detection by constituting a control signal of plural blocks of data and recording while multiplexing plural control signals on one track. CONSTITUTION:The control signal consists of 16-bit and it is enough to add a PCM signal 6 in the unit of tracks. Then 32 blocks of the 2nd bit, that is, 32 bits represent information. The same information is written multiplexedly in the PCM signal information 6 at 0-31 blocks, 32-63 blocks, 64-95 blocks and 96-127 blocks. Thus, even if a part of the reproducing signal is missing due to flaws on a tape, the information is reproduced correctly. The 3rd and the 4th bits are recorded with the other information. Much information is recorded by representing the information with several blocks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to address signals and additional information signals corresponding to each block of a rotary head PCM recorder, and particularly to reducing redundancy for each block and arranging additional information signals within blocks. Relating to a data formation method suitable for.

Compared to conventional analog audio recorders, the 5PCM recorder converts analog signals into digital signals, records the digital signals on a recording medium, and plays them back.
A dramatic improvement in sound quality can be achieved. However, on the other hand, the amount of information transmitted is about 50 times that of the analog method, and when using magnetic tape as a recording medium, the number of tracks must be increased, or the relative speed of the tape and head must be increased as in the case of a rotating head method. Therefore, there is a need to increase the amount of information transmitted per unit time.Currently, there are two types of PCM recorders: fixed head type with multi-track and rotary head type, but it is difficult for general users to use PCM recorders. In order to spread the use, the rotary head type has a lot of potential, considering not only low prices but also running costs and multi-functionality. One of the functions that can be achieved with a rotating head type but is difficult to achieve with a fixed head type is an address search function in double speed mode. This feature is
A rotating head PCM recorder has the ability to add a specific address number to each block of PCM data, display the song position in blocks during normal playback, and at the same time find a specific address in double speed mode. The PCM signal is divided into seven units of several symbols (one symbol M8 bits), for example, 12 symbols, and these several symbols are defined as one block. Then, several blocks, for example 128 blocks, are recorded on one track.

FIG. 1 shows a block configuration of a rotary head PCM recorder. 1 is a synchronization signal and serves as a reference when reproducing data.

Reference numeral 2 denotes a control signal, which records information related to the PCM signal. 3 is a PCM signal, and 4 is a parity for performing error detection and correction. Information necessary for correctly reproducing the PCM signal must be recorded in the control signal.

FIG. 2 shows an example of the structure of the control signal. 5 is an inter-song signal; for example, it is I'o" during a song, and *1'm between songs. This signal is used for random song selection at the beginning of a song. 6 is a P
Information related to CM signals, including sampling frequency,
Dojikapi) & quantization method (linear quantization, broken line compression, etc.)
, analog characteristics (emphasis, noise reduction, etc.), dubbing prohibition code, mute signal, signal type, etc. If this information is to be recorded using the File-BCD code, approximately 24 bits will be required. 7 is a track identification signal, which is used to detect when a track jump occurs during playback. This signal requires about 4 bits. 8 is a block address, which is a signal for preventing interleaving deviation during reproduction. 1 track sum 12
When recording 8 blocks, 7 bits are required.

In this way, the control signal requires about 36 bits,
This is 40% of the PCM signal (96 bits per 12 symbols), resulting in poor redundancy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for recording additional information that has less redundancy and is easy to detect. This data recording method attempts to reduce redundancy and facilitate detection by multiplexing control signals.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 shows the structure of the control signal of the present invention. The control signal is 1
It consists of 6 bits. The inter-song signal 5, track identification signal 7, and block address 8 are the same as those shown in FIG.

It is better to add the inter-track signal 5 to each block in order to facilitate detection during random access.Also, it is necessary to add the track identification signal 7 and block address 8 to each block. On the other hand, it is sufficient to add the PCM signal 6 on a track-by-track basis.Therefore, as shown in FIG. is 0~
The same information is multiplexed in four locations: 51st block, 32nd to 63rd block, 64th to 95th block, and 96th to 127th block.

FIG. 5 shows the structure of 32-bit PCM signal information. 6
-1 is the sampling frequency, 6-2 is the number of quantization bits,
6-3 is the linear/non-linear display of the quantization method, 6-4 is the emphasis function, 6-5 is the dubbing prohibition code, 6-6
is a mute signal, 6-7 is a signal type, and 6-8 is a parity for error detection. Of course, the information 6-1 to 6-7 may have other configurations. In addition, error detection parity 6-8Y
It is 8 bits and can also contain 24 bits of information. In this way, the number of bits of the PCM signal information 6 can be reduced by collectively representing the information of the signals t of multiple blocks.Also, by adding parity for error detection, malfunctions due to data errors can be prevented. can be prevented.

As mentioned above, the PCM signal information 6 is divided into four parts of one track.
There is multiple writing in some places. As a result, even if part of the reproduced signal is lost due to a scratch on the tape, the information can be reproduced correctly.

Other information is recorded in the third and fourth bits. In this part as well, a large amount of information can be recorded by representing the information in several blocks.

FIG. 6 shows a rotary head P for recording control signals of the present invention.
It is a CM recorder. 13 is a synchronization signal generation circuit, 14 is a control signal generation circuit, 15 is a timing generation circuit, and 16 is an A/D conversion circuit.

17 is a signal processing circuit, 18 is a signal switching circuit, and 19 is a recording circuit.゛The two-channel audio signals inputted from the input terminals 11 and 12 are converted into PCM digital signals by the A/D conversion circuit 16. Then, the signal processing circuit 17 adds interleave and parity signals.

The control signal is generated by the control signal generation circuit 14.

21 is an inter-song signal generation circuit, which generates an inter-song signal 5; Reference numeral 22 denotes a PGM signal information generation circuit, which is composed of a 32-bit shift register. The 32-bit data '4e+- shown in FIG. 5 is loaded into the shift register. The input and output of a shift register are connected, and data is circulated by shifting.

When recording control signals, by shifting this shift register at the block cycle, the PC recorded in each block is
M signal information 6 can be generated. 23 and 24 are circuits that generate information to be recorded in 10 of FIG.
It performs the same operation as the PCM signal information generation circuit 22.

During recording, the synchronization signal 1. generated by the synchronization signal generation circuit. The signal generated by the control signal generation circuit 14, the track identification signal and block address generated by the timing generation circuit 15, and the PCM signal and parity generated by the signal processing circuit 17 are transferred to the signal switching circuits 1a&C.
The data is sequentially switched to generate one block of data shown in FIGS. 1 and 3. The signal is then converted into a predetermined signal by the recording circuit 19, and recorded on the tape 26 by the head 25 on the cylinder.

FIG. 7 shows another embodiment of the invention. In FIG. 7, the control signal is composed of 8 bits, and FIG. 7A is the control signal for even blocks, and FIG. 8 is the control signal for odd blocks. The first bit of the control signal indicates whether the block is an even number block or an odd number block; when it is '0', it is an even number block, and when it is '1', it is an order number block. In the even numbered blocks in FIG. 7A, the block address is recorded in the remaining 7 bits. Naturally, the least significant bit of the block address does not need to be recorded. In the odd-numbered blocks in FIG. 7B, the second bit is the inter-track signal 5, the fifth bit is the PCM signal information 6, the fourth bit is other information 9, and the fifth to eighth bits are the track identification signal 7. PCM signal information 6 and
Other information 9 represents one piece of information with the Fc 527' lock as in FIG. In this case, since there are 64 odd blocks, double writing is performed. In addition, the number of multiple writes is
The number of blocks and information J [can be arbitrarily determined depending on the number of blocks and information J]. For example, if one track consists of 240 blocks, the PCM signal information is expressed in 140 bits, and 3
It can be made into a double book.

FIG. 8 shows a rotary head PCM for recording the embodiment of FIG.
It's a recorder. The control signal input to the signal switching circuit 1B is switched by the least significant bit of the block address generated by the timing generation circuit 15. That is, the signal switching circuit 27 selects the lowest bit of the block address, excluding the lowest bit of the block address if it is @o', and selects the output of the control signal generation circuit 14 if it is '1''. 1 and the track identification signal generated by the timing generation circuit 15. Then, the output of the signal switching circuit 27 and the least significant bit of the block address constitute a control signal'.

As described above, the number of bits of the control signal can be reduced by representing information that only needs to be recorded track by track by several blocks of control signals. Furthermore, even for information expressed in several blocks, by overwriting a plurality of pieces of the same length in one track, it is possible to cope with the loss of reproduced data due to hot water on the tape or the like.

According to the present invention, information related to a PCM signal can be recorded in a small capacity, and even if a reproduction signal is missing, the information can be easily reproduced.

[Brief explanation of the drawing]

Fig. 1 shows the block configuration of the rotary head PCM recorder, Fig. 2 shows the control signal structure, Fig. 3 shows the control signal structure of the present invention, Fig. 4 shows the data structure of one track, and Fig. 5 shows the present invention. The structure of the PCM signal information, wc6 diagram shows the rotating head PC
An embodiment of the M recorder, FIG. 7 shows another embodiment of the control signal structure of the present invention, and FIG. 8 shows another embodiment of the rotary head PCM recorder. 1... Synchronization signal 2... Control signal 3... PCM signal 4... Parity 5... Inter-track signal 6... PCM signal information 7... Block address 8... Track identification signal 13... Synchronization signal generation circuit 14... Control signal generation circuit 15... Timing generation circuit 17... Signal processing circuit 18... Signal switching circuit 21... Inter-song signal generation circuit 22... PCM signal information generation circuit 27...signal switching circuit, patent attorney Takahashi FIil USA? Peo l head / λ J9'! J2 Town t Go 7 g No. 513iX Minogawa No. 6 Nagi 13/4/7 Calculation procedure amendment (method) Indication of case 1988 Patent Application No. 245859 Title of the invention
First order of cases related to those who amend data recording methods Name of patent applicant (510) Manufactured by Hitachi Co., Ltd. Procurement fee
Application and specification subject to amendment by the administrator

Claims (1)

[Claims] A synchronization signal, a control signal related to the PCM signal, and a parity signal for error detection and correction are added to tm PCM signals to form one block, and n blocks of signals are recorded on a magnetic tape. In a rotary head PCM recorder that records on one track, the 1-bit or 4-bit control signal is
=s Q. Information is composed of n, bits or n,×4 bits summarized for a block, and the above n. bit or nBXA bit information in one track,
A data recording method characterized by recording data twice. 2. In the data recording method according to claim 1, n of the information of n bits or n1×A bits.
Let s bit or n, XA bit be the actual information, (”
1. A data recording method characterized in that the error detection signal is an error detection signal using the (t-nm) bit or the (nl-n.)XA bit.