JPH0644701A - Recording and recording / playback method - Google Patents

Abstract

(57) [Summary] [Purpose] Not only can the data error correction capability be added to the sub-data to increase the amount of information, but also the reliability of the data can be improved to facilitate the search and improve the search speed. The purpose is to [Structure] Main data is written in a memory circuit 102, an encoding circuit 103 generates a correction block while sequentially shifting each frame of the main data, and a modulator 104 records the correction block on a magnetic tape by a head. Sub data is the memory circuit 10
7, the correction word is generated by the encoding circuit 103 in the same manner as the main data, and is added to the sub data.
The modulator 108 writes on the magnetic tape by the head. The recorded main data is reproduced by the head, demodulated by the demodulator 113, and written in the memory circuit 111. Correction circuit 11
2 corrects the main data. The sub data is also reproduced by the head and demodulated by the demodulator 116, and then the memory circuit 117.
Is written into the memory and is corrected by the correction circuit 112.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and recording / reproducing method, and in particular, main data and sub-data composed of information such as time, address address and music address related to the main data are independently provided by different means. The present invention relates to a recording and recording / reproducing method for recording and reproducing on the same recording medium.

[0002]

2. Description of the Related Art FIG. 8 is a schematic block diagram of a digital audio recorder device using a magnetic tape as a medium as a conventional example of a device for independently recording and reproducing main data and sub data by different means. First, with reference to FIG. 8, the configuration and operation of a conventional digital audio recorder device will be described. The audio signal input to the input terminal 11 is supplied to the A / D converter 1 and converted into a digital signal at a predetermined sampling frequency and the number of quantization bits. This digital signal is given to the encoder 2, and a signal necessary for detecting and correcting a data error occurring in the magnetic tape medium 15 in the recording / reproducing operation is generated, which is converted into digitized audio data. Is added.

The output of the encoder 2 is given to the modulator 3 and subjected to the modulation processing necessary for recording on the magnetic tape medium 15. The output of the modulator 3 is given to two heads 16 and 17, and these heads 16 and 17 are alternately switched to record audio data on the magnetic tape 15. The recorded audio data is reproduced by the head 16 or 17 and given to the demodulator 4. The demodulator 4 demodulates the audio data and supplies it to the decoder 5. The decoder 5 detects and corrects a data error from the demodulated data. The audio data is applied to the D / A converter 6, the digital data is converted into an analog voltage, and the analog voltage is output from the output terminal 12. By using the two-head helical scan recording system which has been put into practical use in the video tape recorder device, for example, the above-described configuration and operation can realize a digital audio recorder device capable of recording and reproducing data on the magnetic tape medium 15.

The above description relates to recording / reproducing of main data, and next, recording / reproducing of sub-data will be described. Sub-data generated by a predetermined data source is SUB
It is input to the input terminal 13. This sub-data is given to the encoder 7 to generate a synchronization code or an error detection code,
This is added to the sub data to form a predetermined data string. This data string is given to the modulator 8 and subjected to the modulation processing necessary for recording the sub data on the magnetic tape 15. Then, the data is recorded on the magnetic tape 15 by the head 18.

At the time of reproduction, a signal is taken out by the head 18, the parallel recording array is restored by the demodulator 9, and the decoder 1
Given to 0. The decoder 10 uses the synchronization code as a reference,
Simultaneously with the data error detection, the sub-data reproduction process is performed. As a result, the sub data and the presence / absence of an error are SUB.
It is output from the output terminal 14. The head 18 for recording the sub data on the magnetic tape medium 15 is fixedly provided unlike the heads 16 and 17 described above. As described above, recording / reproducing is performed using the signal processing system for the main data and the sub data.

FIG. 9 is a diagram showing an example of use of the magnetic tape medium 15 used in the recording / reproducing apparatus shown in FIG. Figure 9
In, the main data and the sub data are recorded completely separately. Next, the reason for this will be described. In general, the amount of main data obtained by digitizing an audio signal is the product of the number of quantization bits, the sampling frequency, and the number of channels. If each is assumed to be 16 bits, 48 kHz, and 2 channels, 1.536 Mbits are assumed. / Sec. If error detection and correction codes are added to this with a redundancy of about 30%,
2 Mbit / sec or more.

On the other hand, the amount of sub-data consisting of date, performance time, address address, song number, song name, etc. is several hundred bits / second or less. The former data amount is directly searched at high speed (generally 10
It is impossible in terms of processing speed and capacity of the file, and the latter is used for the purpose of compensating for this.
The use of the latter is secondary, and the error correction function of data was not added for the purpose of making it as cheap as possible, and it was only to detect an error. Therefore, the amount of data is limited to a level that can be practically used without error correction.
This amount is about 200 bits / second.

However, for example, using a date as an example,
Even the number of December 31, 1983 requires a minimum of 4 bits x 6 digits = 24 bits, and if the maximum Kanji JIS code is used, it will be 104 bits. Thus, 20
With a data amount of about 0 bits, it is not possible to sufficiently record / reproduce information necessary for retrieval. In addition, the magnetic tape medium 15 has a problem such as scratches and dust, which causes a data error without fail. For example, when searching with data recorded only one per second, the data has an error. If so, the problem is that the required time is longer than the design value. Further, at the time of high-speed search, the tape movement amount increases in proportion to the speed of normal reproduction, so that the influence of data error becomes large and the search speed becomes slower.

As described above, the conventional apparatus for recording / reproducing main data and sub-data independently has the drawback that the information amount of the sub-data is small and that the data error countermeasure is insufficient. Due to this, the search or the speed is limited, and there is a drawback that a device that is easy to use cannot be obtained.

[0010]

SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to add data error correction capability to sub-data to increase the amount of information as well as to improve the reliability of data. It is an object of the present invention to provide a recording and recording / reproducing method that facilitates a search and can improve the search speed.

[0011]

The invention according to claim 1 is
In a recording method for recording main data and sub data on the same recording medium, for main data and sub data,
Encoding for error correction is performed using codes having the same inter-code distance, and main data and sub data are recorded in different areas of a recording medium.

According to a second aspect of the present invention, in a recording / reproducing method for recording and reproducing main data and sub data on the same recording medium, the main data and the sub data have the same intersymbol distance. The main data and the sub data are recorded in different areas of the recording medium by performing encoding for error correction with a code, and the main data and the sub data are reproduced from the different areas of the recording medium. The error of is corrected by time division.

According to a third aspect of the present invention, the main data of the second aspect is recorded / reproduced by using a plurality of rotary heads, and encoding for error correction is completed with the data recorded by one scan of the rotary heads. .

According to the invention of claim 4, the sub signal of claim 3 is recorded at the end of the tape by a head different from the main signal.

[0015]

According to the recording and recording / reproducing method of the present invention, the main data and the sub-data are coded for error correction with the codes having the same inter-code distance to record the main data and the sub-data, respectively. Record on different areas of the medium. Then, the main data and the sub data are reproduced from different areas of the recording medium, and the error of the main data and the sub data is corrected by time division.

[0016]

1 is a diagram showing an example of a data word string to which an error correction code is added according to an embodiment of the present invention.
FIG. 2 is a diagram showing a memory usage example of main data encoding,
FIG. 3 is a diagram showing a memory usage example of sub-data encoding,
FIG. 4 is a diagram showing an encoding configuration of a recording system, FIG. 5 is a diagram showing an encoding configuration of a reproducing system, FIG. 6 is a time chart in encoding, and FIG. 7 is a time chart in decoding. is there.

Next, with reference to FIG. 1 to FIG. 7, a specific configuration of an embodiment of the present invention and its operation will be described. As shown in FIG. 1, for four sample words W ₀ to W ₃ each consisting of r bits (r is an integer),
A case where two correction words P and Q are added will be described. In FIG. 4, a sample word A / D converted from the input terminal 101 by the A / D converter 1 shown in FIG. 8 is stored in the memory circuit 102. The memory circuit 102 has a capacity for the number of words (sample words + correction words) written in one scanning period. As an example, FIG. 2 shows a case having a capacity of 6 × n words. 4 × n stored in this memory 102
Encoding is performed on the sample words. That is, the sample word read from the memory circuit 102 is given to the encoding circuit 103.

In the encoding circuit 103, as shown by the blocks a and b in FIG. 2, four sample words are input in the diagonal direction and two correction words P and Q are generated and sampled. Add to word, 1 in 6 words
One correction block. Various methods can be considered for this generation method, but they will not be described here. Encoding circuit 10
3 sequentially shifts horizontally for each frame to generate 3n correction blocks and complete encoding. Next, the correction blocks are sequentially read out in the vertical direction from the memory circuit 102 and given to the next modulator 104. The modulator 104 modulates the correction block and supplies the correction block to the head from the terminal 105.

On the other hand, the sub data is input from the input terminal 106, and the memory 10 having a capacity of 6 × m words shown in FIG.
Written in 7. Then, the encoding circuit 103, like the main data, generates two correction words for the four data and adds them to the sub data written in the memory circuit 107. Then, the sub-data to which the correction word is added and written in the memory circuit 107 is sequentially read out in the vertical direction and given to the modulator 108. The modulator 108 modulates the sub-data to which the correction word is added, and outputs the output terminal 109.
To the head through.

Writing to the magnetic tape medium 15 is performed according to the time chart shown in FIG. That is, FIG.
Shows the case where the winding angle between the head and the tape is 90 ° by using the two-head rotary head. In FIG. 6, since the winding angle is 90 °, about half of one scanning period is the recording period, and the remaining part is the non-signal period. Therefore, main data is encoded within the no-signal period. Let it complete. In order to realize this, there are two systems of memories A and B, the memory A is used for writing samples generated in one scanning period, the memory B is used for encoding and recording, and the sequential memory A is used. , B can be realized.

Next, the sub-data is encoded using the recording period shown in FIG. In this way, the dedicated memory circuits 102 and 103 are provided corresponding to the main data and the sub-data, respectively, and the same encoding circuit 103 is used in a time-division manner, so that the encoding of both data is the same. This can be performed by the encoding circuit 103.

The operation of the reproducing system will be described below. The reproduction main data is input to the demodulator 113 via the input terminal 114. The demodulator 113 demodulates the reproduced data and writes it in the memory circuit 112. When the reproduction main data for one scanning period is written, the correction circuit 112 reads the data of one correction block from the memory circuit 111 and corrects it. FIG. 7 shows a time chart of the main signal processing at the time of reproduction, in which the main signal reproduced at half the time of one scanning period is written in the memory 111 and at the half of the next non-signal section. The correction is performed in the scanning period, and the data for one scanning period corrected in the next one scanning period is output from the output terminal 110 to D /
It is output to the A converter. And in the same way as when recording,
This can be continuously realized by alternately switching the memories A and B having the same capacity.

On the other hand, the sub data is input to the demodulator 116 via the input terminal 115. The demodulator 116 demodulates the sub data and writes it in the memory circuit 117. The correction circuit 112 performs correction processing within the period of the main signal shown in FIG. 7 to sequentially read the sub data from the memory circuit 117 and output the output terminal 118.
Output to. The sub data memory circuit 117 also has A and B
The above operation can be realized by having two systems.

In the above embodiment, the case where four sample words and two correction words are used has been described, but these numerical values can be set arbitrarily. Further, in the above-described embodiment, the case where the magnetic tape medium 15 is wound around the head by 90 ° has been described, but the angle of 90 ° is not limited to this and can be realized at any predetermined angle. The time interval only changes depending on the angle.
Further, in the above description, the main data memory circuit 10
2, 107 and sub-data memory circuits 111, 117
However, the same large-capacity memory may be used in different recording areas.

In the above description, the case of using the 2-head helical scan type recording / reproducing system has been described, but the present invention is not limited to this, and the fixed head type recording / reproducing system and the disk type recording / reproducing system are also applicable. It is also possible to apply the invention.

[0026]

As described above, according to the present invention, the main data and the sub-data are coded for error correction with the codes having the same inter-code distance, and the main data and the sub-data are respectively processed. Recording in different areas of the recording medium, reproducing main data and sub-data from different areas of the recording medium,
Since each error is corrected by time division, highly reliable data recording / reproducing of both data can be realized by an inexpensive method.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a data word string to which an error correction code according to an embodiment of the present invention is added.

FIG. 2 is a diagram showing an example of use of a memory for encoding main data.

FIG. 3 is a diagram showing an example of use of a memory for encoding sub data.

FIG. 4 is a block diagram showing a coding configuration of a recording system in an embodiment of the present invention.

[Fig. 5] Fig. 5 is a diagram similarly showing a coding configuration of a reproduction system.

FIG. 6 is a time chart for encoding.

FIG. 7 is a time chart in decoding.

FIG. 8 is a schematic block diagram showing the configuration of a conventional recording / reproducing apparatus.

FIG. 9 is a diagram showing an example of use of a magnetic tape in a conventional recording / reproducing apparatus.

[Explanation of symbols]

 1 A / D converter 6 D / A converter 15 Recording tape medium 16, 17, 18 Head 102, 107, 111, 117 Memory circuit 103 Encoding circuit 104, 108 Modulator 112 Correction circuit 113, 116 Demodulator

Claims (4)

[Claims] 1. A recording method for recording main data and sub data on the same recording medium, wherein the main data and the sub data are coded for error correction with a code having the same inter-code distance. And the main data and the sub data are recorded in different areas of the recording medium. 2. A recording / reproducing method for recording and reproducing main data and sub-data on the same recording medium, wherein error correction is performed on the main data and the sub-data with codes having the same inter-code distance. To record the main data and the sub data in different areas of the recording medium, reproduce the main data and the sub data from different areas of the recording medium, and generate an error in the main data and the sub data. A recording / reproducing method, characterized in that correction processing is performed in a time division manner. 3. The main data is recorded and reproduced by using a plurality of rotary heads, and encoding for error correction is completed which is completed by data recorded by one scan of the rotary heads. 2. Recording / reproducing method. 4. The sub signal is recorded at the end of the tape by a head different from the main signal.
Recording and playback method.