JPH09326172A - Method and device for transmitting data for recording and reproducing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform realtime error processing by comparing generated error correcting signal with an error correcting signal including reproduced data, and at the time of judging that error exists, by correcting error and outputting packet data. SOLUTION: The dummy data section succeeding to the check sum of the reproduced signals having come from a disk is sent to a check-sum effectiveness confirming means 108, where the data of the dummy data region is checked to judge whether the check sum added to the reproduced data is effective or not. When it is judged that the check sum is effective, the result of judgement is transferred to a check-sum collating means 109 and the reproduced check sum is collated with the check sum obtained by calculation to judge whether the data has error or not. And the result of judgement is sent to the debugging section 11 and if the data has error, it is subjected to error processing. Otherwise, packet data except the debugging data is made and sent to the outside of this system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission apparatus and method, and more specifically, in a conventional recording / reproducing system using a disc, when the length of information data is less than the end of a sector, Paying attention to the fact that the rest is filled with dummy data, and by making this dummy data area a data with a rule, while maintaining compatibility with the data recorded in the past, transmission system and disk recording The present invention relates to performing error detection of a recording / reproducing system including a reproducing device.

[0002]

When information data such as video signals, audio signals, computer data signals, etc. are recorded on a disc, the information data recorded on the disc is recorded in units of each sector on the disc. To be done.

On the other hand, the information data to be recorded is sectioned into a predetermined length and sent to the transmission system as a packet signal.
Therefore, when the length of the packet, in other words, the length of the information data is not exactly the length of the sector or an integral multiple thereof, the unrecorded portion of the sector or the last sector is normally filled with padding data. . This padding data is usually dummy data and has no meaning and is so-called dust on the disc.

Conventionally, there is a system for transmitting data from a system computer to a recording / reproducing apparatus through a circuit of a transmission system. In such a system, a transmission system from the input / output of the processor to the recording / reproducing apparatus (for example, SC
The error that occurs in SI) and the error that occurs in the recording / reproducing apparatus are detected separately and are processed via the system computer, so they are not suitable for applications in which signals are processed in real time.

Further, if error detection by a conventional method is additionally introduced in the middle of a system which is already in operation now, it is difficult to ensure compatibility with the already recorded data format.

The present invention provides a recording / reproducing system that overcomes the drawbacks of the conventional device described above, has a higher error detection rate while maintaining compatibility with the data recorded by the conventional device, and is capable of real-time processing. This is an issue.

[0007]

In order to solve the above-mentioned problems, according to the present invention, packet data is received, and the packet data is used as information data, which corresponds to the sector length on the disk to be recorded, or one of them. A recording data transmitting device for filling the above sectors, filling the remaining portion in the final sector with dummy data, and transmitting the same to the disc recording / reproducing device, wherein the packet data is received as the information data and the above-mentioned 1 or Means for packing the above sectors, means for making an error correction signal of the information data, and means for adding the above error correction signal to the end of the above information data as dummy data so that the remaining portion in the sector is Means to fill with an increment signal,
There is provided a recording data transmitting device including the.

Further, according to the present invention, the means for receiving the data reproduced and transmitted by the disk recording / reproducing apparatus and generating the error correction signal based on the information data in the data, and the means for initializing the error correction signal A means for determining the validity of the error correction signal by creating an increment signal that is sequentially incremented for each word as a value and comparing it with the value of the corresponding word in the dummy data of the received data; If the result is valid, the error correction signal generated above is compared with the error correction signal included in the reproduction data, and a means for outputting the determination result, and the result of the determination, it is determined that there is an error. In some cases, there is provided a reproduction data receiving apparatus including means for depacking and outputting packet data after performing error processing.

In the recording data signal transmitting apparatus and the reproduction data signal receiving apparatus, the error correction signal is
The signal is preferably made by adding all the words that make up the information data.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a case where the present invention is introduced into audio signal recording / reproducing of an AV server system will be described with reference to FIGS. FIG. 1 is a block diagram of the entire recording / reproducing system of the present invention.

As shown in the figure, this system includes a data input unit 100, a disk packing unit 101, a checksum calculation unit 102, and an error detection data addition unit 10.
3, disk interface 104, transmission system 105,
Disk recording / reproducing device 106, checksum computing means 1
07, checksum validity confirmation means 108, checksum collation means 109, depacking means 110, and data output 111.

The audio packet signal sent from the outside is input from the data input 100 to the disc packing means 101, where it is converted into the disc format and sent to the checksum computing means 102 in the next stage.
The checksum calculation means 102 calculates the checksum of the information data portion for each packet, and the error detection data adding means 103 in the next stage increments the checksum data and the checksum data in the dummy data portion. Add data.

In the above, the term checksum is used, which is a kind of error correction signal as will be described later, and means to obtain the total value of the words forming the data signal. Other suitable error correction signals can be used in place of this checksum. The data thus created is transmitted from the disc interface 104 through the transmission system 105 to the disc recording / reproducing apparatus 10.
It is sent to 6 and recorded there.

In reproducing the data, the data reproduced from the disc recording / reproducing device 106 is sent to the reproducing system through the disc interface 104, and the checksum computing means 107 calculates the checksum of the reproduced data. Then, the dummy data portion following the checksum of the signal reproduced from the disc and sent on the transmission line is sent to the checksum validity checking means 108, where the data in the dummy data area is checked to find in the playback data. Determine whether the added checksum is valid.

The checksum validity is determined, for example, by checking the regularity of the dummy data. Therefore, when creating dummy data, a checksum is added to the beginning, the next word is a value obtained by incrementing the checksum by a predetermined value, and the next word is incremented by a predetermined value from the previous value. In this method, the value up to the last word of the sector is incremented by a predetermined value for each word is recorded. Upon reproduction, these dummy data are read, and it is determined to be valid if a value incremented by the predetermined value (for example, 1) is detected.

This method has an advantage that the length of dummy data can be arbitrarily selected. If a fixed length valid / invalid display signal is recorded in the dummy data portion, accurate display cannot be performed when the length of the dummy data portion is shorter than the length of the display signal.

As a result of the checksum validity check test, if it is determined that the checksum is valid, the fact is transmitted to the checksum collating means 109, and the checksum reproduced by the checksum collating means 109 is transmitted. The checksum obtained by the calculation is collated to determine whether or not the data has an error. The determination result is the depacking unit 11
0, and if there is an error, error processing is performed. This error handling can be performed according to each system. If there is no error, it creates packet data excluding padding data and sends it out of this system.

FIG. 2 shows a data block of audio packet data. CH-1 to CH1 illustrated in FIG.
One packet of data is assigned to each of the four sectors indicated by CH4, and error detection data is added to the shaded dummy data area.

Each sector, as shown in FIG.
It consists of an information data area and a dummy data area that follows it. Checksum data is added to the beginning of the dummy data, and the second and subsequent ones are filled up to the end of the sector with data in which the checksum data is sequentially incremented.

The length of the dummy data area changes complementarily to the length of the information data area. In that case, it may happen that the dummy data area is too short to write the valid / invalid code. In order to be able to deal with the above, it is more suitable to use an increment signal that can always compare all data even if the data length changes, rather than using coded fixed data.

In the checksum validity checking means 108, an error check code such as a checksum is used as an initial value and a value obtained by incrementing a predetermined value for each word and a corresponding word included in the reproduced data. If the values match for each word, it is determined to be valid, and if not, it is determined to be invalid. By performing such validity confirmation operation,
Compatibility with recording formats prior to the introduction of the present invention is maintained.

FIG. 3 is a block diagram showing an example of the reproducing system for explaining the error detection on the reproducing side. As shown in the figure, this system includes a data input 301, a data position detection means 302, a system control signal input 303, a checksum calculation and extraction means 304, an increment counter 305, a checksum validity confirmation means 306, an error processing means. 307, checksum collating means 308, and data output 309.

The reproduction data supplied from the disk reproduction device 106 of FIG. 1 is sent to the disk interface 104 through the transmission system 105, and the data directed to the reproduction system is supplied to the data input of this system. . This data is sent to the data position detecting means 302, which detects the start position and end position of the information data in the audio packet and also detects the end (end position) of the packet.

The output of the data position detection means 302 is sent to the checksum calculation and extraction means 304. The checksum calculation and extraction means 304 calculates the checksum of the received information data and extracts the checksum data added during the recording.

Here, the checksum operation is a process for adding information data in word units from the beginning to the end, and the addition result constitutes an error detection signal. Therefore,
Instead of this checksum calculation, it goes without saying that error detection can be performed using another error detection signal.

This checksum calculation and extraction means 304
The checksum data added at the time of recording, which has been extracted in step 3, is sent to the increment counter 305 and preset in the counter provided therein. This counter starts increment counting using the received checksum data as an initial value. The count output is the checksum validity confirmation means 30 each time the increment count is performed.
Sent to 6.

The above checksum validity confirmation means 306
Receives the reproduction data signal from the checksum calculation and extraction means 304, receives the increment signal obtained by the counting from the increment counter means 305, and outputs the dummy signal included in the increment signal and the reproduction data. The second and subsequent data of the data are compared to the end of the packet.

As a result of comparison, if there is no difference between the increment signal reproduced after the second dummy data and the increment signal obtained by counting, it is judged that the extracted checksum data is valid, and the difference is found. If there is, it is judged to be invalid and a validity flag is set (that is, for example, a signal to make valid 1 and invalid 0 is made) and this is sent to the checksum collating means 308. The output of the checksum validity checking means 306 is sent to the error processing means 307.

The checksum checking means 308 checks the checksum if it is valid. That is, when a valid flag signal is sent from the checksum validity confirming means 306, the checksum collating means 308 extracts the checksum obtained by the checksum calculation and the calculation sent from the extracting means 304 and extracts it. The obtained checksum is collated to detect whether there is an error.

If an error is detected, the result is sent to the error processing means 307. The error processing unit 307 performs error processing according to the system being used. If no error is detected, do nothing.

When the validity flag from the checksum validity checking means 306 indicates invalidity, the data packed in the dummy data area of the data cannot be used for error checking by the conventional data format. Therefore, the checksum collating means 308 does not collate the checksum. Therefore, the error processing means 307 does not perform error processing on the data sent from the checksum validity checking means 306 to the error processing means 307.

As is clear from the above description, the error detecting method in the recording / reproducing data transmitting apparatus of the present invention is an error detecting method compatible with the data recorded by the conventional recording / reproducing apparatus. . In other words, since the validity flag indicates invalidity for the conventional recording data, no error processing is performed, and the validity flag indicates valid for the recording data according to the present invention, an error check is performed. If the checksum verification results in the verification means do not match, no error processing instruction is given to the error processing means in the same manner as described above.
The error processing means 307 is the checksum validity checking means 3
The data from 06 is output as it is.

Only when the checksum validity checking means 306 outputs the validity flag output indicating validity, the checksum checking means 308 checks the checksum, and an error occurs only when the check results match. Since the processing means 307 is instructed to perform error processing, it can be handled in exactly the same way as the conventional recording data except that the error detection probability for the recording data according to the present invention is high.

[0034]

According to the disk recording / reproducing system of the present invention, the following effects can be obtained. 1. Error processing can be done in real time. 2. Error processing can be performed in sector units. However, the packet size must be within the sector. 3. The present invention can be applied to a system that is already in operation. In other words, the compatibility with the already recorded recording format is taken into consideration. Moreover, it does not affect the error detection and processing already introduced. 4. The introduction of the present invention does not affect the recording capacity at all. 5. It does not depend on the disc recording / reproducing device and the transmission system. 6. It is possible to detect an error that has occurred in all systems from the processor exit (record OUT) to the processor input (play IN) via the recording / playback device.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an example of a recording / reproducing data transmission device of the present invention.

FIG. 2 is a signal array diagram of audio packet signals handled in an example of the recording / reproducing data transmission device of the present invention.

FIG. 3 is a block diagram of an example of a receiving system of the recording / reproducing data transmitting apparatus of the present invention.

[Explanation of symbols]

100 data input, 101 disk packing means, 102 checksum computing means, 103 error detection data adding means, 104 disk interface, 105 transmission system, 106 disk recording / reproducing device,
107 checksum computing means, 108 checksum validity checking means, 109 checksum collating means, 1
10 depacking means, 111 data output

Claims (9)

[Claims] 1. A means for receiving packet data, packing the packet data as information data into one or more sectors corresponding to a sector length on a recording disk, and a means for producing an error correction signal of the information data. And a means for adding the error correction signal to the end of the information data as dummy data and filling the remaining portion in the sector with an increment signal obtained by sequentially incrementing the error correction signal. . 2. The recording data transmitting apparatus according to claim 1, wherein the error correction signal is created by adding all the words forming the information data. 3. A means for receiving data reproduced and transmitted by a disk recording / reproducing apparatus and generating an error correction signal based on information data in the data; and a unit for each word with the error correction signal as an initial value. Means for determining the validity of the error correction signal by creating increment signals that are sequentially incremented and comparing with the value of the corresponding word in the dummy data of the received data, and the result of the validity determination are effective. In this case, a means for comparing the generated error correction signal with the error correction signal included in the reproduction data and outputting the judgment result, and if the judgment result indicates that there is an error, error processing is performed. And a packet data output unit for depacking and outputting the packet data. 4. The reproduction data receiving apparatus according to claim 3, wherein the error correction signal is created by adding all the words forming the information data. 5. A means for receiving packet data, packing the packet data as information data into one or more sectors corresponding to a sector length on a recording disk, and a means for producing an error correction signal of the information data. And a means for adding the error correction signal to the end of the information data as dummy data and filling the remaining portion in the sector with an increment signal obtained by sequentially incrementing the error correction signal. A means for receiving the data reproduced and transmitted by the disk recording / reproducing apparatus and generating an error correction signal based on the information data in the data; and a means for sequentially incrementing for each word with the error correction signal as an initial value. By creating an increment signal and comparing it with the value of the corresponding word in the dummy data of the received data, the error A means for judging the validity of the correction signal and, when the result of the validity judgment is valid, compares the generated error correction signal with the error correction signal included in the reproduction data and outputs the judgment result. And a reproduction data receiving system including means for depacking and outputting packet data after performing error processing when it is determined that there is an error as a result of the determination. Playback data transmission device. 6. A step of receiving packet data, packing the packet data as information data into one or more sectors corresponding to a sector length on a recording disk, and a step of producing an error correction signal of the information data. And a step of adding the error correction signal to the end of the information data as dummy data and filling the remaining portion in the sector with an increment signal obtained by sequentially incrementing the error correction signal. 7. The recording data transmitting method according to claim 6, wherein the step of producing the error correction signal is a step of producing an error correction signal by adding all the words forming the information data. . 8. A step of receiving data reproduced and transmitted by a disk recording / reproducing device and generating an error correction signal based on information data in the data, and the error correction signal as an initial value for each word The step of determining the validity of the error correction signal by making incremental increment signals and comparing with the value of the corresponding word in the dummy data of the received data, and the result of the validity determination are effective. In this case, a step of comparing the error correction signal generated above with the error correction signal included in the reproduction data and outputting the determination result, and if the result of the determination is that there is an error, error processing is performed. And then outputting the packet data after depacking. 9. The reproduction data receiving method according to claim 8, wherein the error correction signal is created by adding all the words forming the information data.