JPS60147972A - Method of data recording - Google Patents

Abstract

PURPOSE:To enable recording of additional information small in redundancy and easy to detect in block recording of PCM signals by a rotary head by constituting additional information of controlling signals of plural tracks and multiple recording the same signal plural times in a track. CONSTITUTION:A controlling signal formed of intermusic signal, PCM signal information 6, block address 7, track discrimination signal 8 etc. is added to 1 track by rotary head recording together with a synchronizing signal and parity for each block of PCM signal divided into specified number of symbols to be recorded such as 128 blocks etc. The information 6 including sampling frequency, number of quantizing bits, method of quantizing, analog characteristic, dubbing prohibition and mute is formed of controlling signals extending over 32 tracks etc., and multiple recorded in the same position for each block, and number of record bits of the information 6 in each track is decreased. Accordingly, redundancy in block recording is small, and easily detectable additional information can be recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] - The present invention relates to additional information transmission added to each block of a one-rotation head PCM recorder, and in particular reduces the redundancy of each block, 7.C Data recording method suitable for distributing W notification signals within 10 blocks.

[Background of the invention]

A PCM recorder that converts an analog signal into a digital 4i signal and reproduces the digital signal on a recording medium can achieve a dramatic increase in f/4i compared to a conventional analog 20 audio recorder. . However, the transmission information @i violet is about 50 times higher than that of the analog type, and when using a ``C magnetic tube'' as a glued medium, the number of trunks is increased and the number of trunks is increased, such as a one-rotation head type. Therefore, it is necessary to increase the amount of information transmitted per unit time by increasing the speed of tape and head.

At present, this is the method for PCM recorders.

There are single head type and rotary head type with multi-tracks, but in order to popularize pCM recorders among general users, it is necessary to consider not only lower prices but also running costs and multi-functionality. The rotating head type has many possibilities. One of the functions that the rotary head type has a central function, while the fixed head type has a central function, is an address search function in double speed mode. This feature is.

1) Add a special address blue code to each block mother of the CM take, and during normal playback [112
At the same time as Ibaraki 1-6, it is possible to create an address that saves time in 1f speed mode.・Rotating hand PC
For M recorders, several symbols (1 symbol = 8 bits)
For example, a PCM signal is divided into units of 12 symbols, and these several symbols are treated as one flock. Then, several blocks, for example 128 blocks, are recorded on one track.

Figure 81 shows the block configuration of the rotary head 10M lefter. 1 is a synchronization signal and serves as a reference when reproducing data. 2 is the control signal 169. Record information related to the PCM signal. 3 is a PCM signal, and 4 is a parity for error detection and correction. For control signals, PC
The information necessary to correctly reproduce the M signal must be recorded.

FIG. 2 shows an example of the structure of the control signal. 5 is an inter-song signal, and for example, it is 1019 during a song and 11' between songs. This signal is used for finding the beginning of a song or for random song selection. 6 is PCM
Information related to the signal, including sampling frequency and number of digitized bits.

There are digitization methods (@*quantization, compression, etc.), analog characteristics (emphasis, noise reduction, etc.), dubbing prohibition codes, me-F signals, signal types, etc. If this information is to be recorded in 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.

The Kono signal requires about 4 bits. 8 is a gummy address, which is a signal for preventing interleaving deviation during reproduction. When recording 127 blocks on one track, 7 bits are required.

In this way, the control signal requires about 66 bits, or
This is a PCM signal (12 symbols = 96 bits) Q) 4
719. My drowsiness and anxiety worsen.

[Purpose of % Ming]

An object of the present invention is to provide a take recording method for recording additional information that has little redundancy and is easy to detect.

[Summary of the invention]

In the present invention, the fj addition information is composed of the control signal of the track of the arguend, and one track [the same signal is transmitted multiple times]. By recording the information, there is less redundancy and it is easier to post.

[Example of invention in action]

The following is a complete explanation of a 7m example of the present invention with reference to FIGS. 6 and 4.

No.! The first factor is the configuration of the control signal of the present invention. The control signal is 16 bits. Inter-song signal 5 and track identification signal 7. Block address 8 is similar to that in FIG. It is preferable to add the inter-song signal 5 to each block in order to facilitate detection during random access. Also,
Signal by truck fleet 7. It is natural that the ag address 8 must be added to each block. Mow on this.

It is sufficient to add the PCM signal information 6 in units of several tracks. Therefore, as shown in Figure 4, information is expressed using 62 tracks of 2 bits, that is, 32 bits. moreover,
The pCM signal information '4&6' is stored in one block at 128 locations from 0 to 127, and contains a large amount of information.

FIG. 5 shows the structure of 52-bit PCM signal information. 6
-1 is the sampling frequency, 6-2 is the number of digitized bits,
6-3 is the display of box carp/non-naikogan of the Nikko method, and 6-4 is the presence or absence of emphasis.

6-5 is a dubbing prohibition code, 6-6 is a mute signal,
6-7 is a signal type, and 6-8 is an error detection parity. Information on 6-1 to 6-7 is of course available in other configurations as well. 1, the parity 6-8 for detection is 8 hits, and 2
You can also add 4-bit reconnaissance information. In this way, the number of 60 bits of pCM signal information can be reduced by expressing information by combining the signals of a plurality of blocks into one. Also, by adding 6 parities for error detection,
Malfunctions due to data errors can be prevented.

As mentioned above, PCM signal information 6 is %1 track 1.
It has multiple investments in 28 locations. Thereby, even if part of the reproduction signal is lost due to scratches or the like on the tape, the information can be reproduced correctly.

Other information is recorded in m 5 + L 4 bits. These three parts can also record a large amount of information by representing the information with several tracks.

A track identification signal 7 is used to identify the track during reproduction, that is, to identify which bit of the information shown in Fig. 5 is recorded on the track. Since the track identification signal 6 has 4 bits, 16 tracks can be identified. Also.

Adjacent tracks can be identified by their azimuth angles. Therefore, 62 tracks can be identified using the track identification signal 6.

The iA6 is a 5-rotation head PCM recorder that records control signals according to the present invention. 16 is a synchronization signal generation time M, 1
4 is a control signal generation circuit, 15 is a timing generation circuit, 1
6 is A11) conversion circuit, 17 is a signal processing circuit, 18 is a signal switching circuit, and 19 is a recording circuit.

Two-channel audio signals input from input terminals 11 and 12 are converted into PCM digital signals by a 4/1) conversion circuit 16. Interleague and parity signals are added by a seven-degree signal processing circuit 17.

The ft1lJ control signal is generated by the 1st decoration No. 18 generation circuit 14. Reference numeral 21 is a music dark signal generator circuit which generates 1g No. 5 during one music. 22 is the PCM signal @1% main circuit, which is connected to a 32-bit shift register, FIIIjJx
.

has been done. The shift register has #! 5 I lost it badly 3
Load 2-bit data. 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 track period, the PC recording on each track can be adjusted.
M signal information #16 can be generated. 23 and 24
is a circuit that generates the information to be recorded at 9 and 10 in FIG.

During recording, the synchronization signal 1. generated by the synchronization signal generation circuit. The signal generated by the control signal generation circuit 14 and the track identification 1 generated by the timing generation circuit 15
The signal switching circuit 18 sequentially switches the No. 6 and 10 block addresses, the PCM signal and the parity generated by the signal processing circuit 17, and generates one flock of data shown in FIGS. 1 and 6. The signal is then converted into a predetermined rectangular 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 present invention. In FIG. 7, the control signal is composed of 8 bits, and FIG. 7A is the control signal for even two locks, and FIG. 48 is the control signal for odd number blocks. The w, 1 bit of the control signal indicates whether it is an even block or an odd block, and 2'0° is an even block, and '11' is a life block. - Even number in Figure 7A. In the block, the block address is recorded in the remaining 7 bits.Of course, the least significant bit of the block address may be recorded.

In the odd song in Figure 7B, the second focus is the inter-song signal 5.
, the sixth bit is PC'M signal information 6. The fourth bit is other information 9S, and the fifth to eighth bits are a track identification signal 7. The PCM signal information 6 and other information 9 represent one piece of information in 32 tracks as in FIG. In this case, since there are 64 odd-numbered 7-occupations, there are 64 superimpositions.

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 18 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 block address excluding the least significant bit when the least significant bit of the block address is 101, and selects the block address excluding the least significant bit when the least significant bit of the block address is 1'. The track identification signal generated by the timing generation circuit 15 is selected.

Then, a control signal is constituted by the output of the signal switching circuit 27 and the least significant bit of the block address.

As described above, the number of bits of the control signal can be reduced by representing information that can be recorded track by track by control signals of several tracks. Furthermore, even for information expressed in several tracks, by performing multiple identical lines in one track, it is possible to cope with missing reproduction takes due to false information on the tape, etc.

Note that the capacity of information can be increased by reducing the number of times of writing. For example, in the embodiment shown in FIG. 3, if the number of times of multiple writing is 64 and two blocks represent one piece of information.

The information capacity can be reduced to 64 pits.

〔Effect of the invention〕

According to the present invention, information related to a pCM signal can be recorded with a small capacity, and even if a playback signal is missing, the information can be easily reproduced.

[Brief explanation of the drawings] Figure 1 shows 10 configurations of a rotating head pCM recorder.
Fig. 2 is a configuration diagram of the control signal, Fig. 3 is a configuration diagram of the control signal '#4M of the present invention, Fig. 4 is a configuration diagram of the take of one track, and Fig. 5 is the configuration of PCM signal information of the present invention. 6 is a diagram showing an embodiment of a rotary head PCM recorder, FIG. 7 is a diagram showing another embodiment of the control signal configuration of the present invention, and FIG. 8 is a diagram showing another embodiment of a rotary head PCM recorder. FIG. 1... Synchronization signal 2... Control signal 5... PCM signal 4... Parity 5... Inter-song 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@ number information generation circuit 27...Signal switching circuit agent Patent attorney Akio Shiro 1st figure 3M Moeda Ω 4th figure 32 dob 1. Figure) 3 7th item! li'i ”1

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 1 m PCM signals to form a "'c1 block." The block signal is recorded on a magnetic tape. In a rotary head PCM recorder that records on one track, the information is composed of 1 bit or NXk bits, in which the control signal of 1 bit or 2 bits is assembled into N tracks, and the control signal of 1 bit or 2 bits is recorded on 1 track. A data recording method characterized in that the information of the /V bit or the IVxk bit is transmitted to one track or the n/k Ig1 crime is recorded. A data II IC recording method characterized in that N' bits of the bits are used as central division information, and (It-N') bits or (NXk'-N') bits are used as an error detection signal.