JPS63181174A - Magnetic recording and reproducing system - Google Patents

Abstract

PURPOSE:To attain efficient data transmission and processing by arranging a flag representing a deteriorated correcting state as the AUX DATA in the 1st and 2nd flags representing the correcting state of the 1st and 2nd correction blocks. CONSTITUTION:The format of the subframe of the transmission interface is constituted by at least the preamble, the AUX DATA and the audio data. The block of an even number address and the block of an odd number address larger by one are used for the unit of error correction by the set of the subcode data used by plural symbols. The 1st correction block is constituted by the set of even number symbols in two blocks constituting the unit and the 2nd correction block is constituted by the set of odd number symbols. Then the flag representing the deteriorated correction state is arranged as the AUX DATA in the 1st and 2nd flags representing the correcting state of the 1st and 2nd correction blocks. Thus, the efficient data transmission and processing are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing system represented by R-DAT.

[Summary of the invention]

In the present invention, among the flags representing the error correction situation, a flag representing a worse situation is transmitted.

[Conventional technology]

In R-DAT, subcode data is recorded together with PCM audio data. Subcode data is 1
It is recorded in two areas (SUB-1, 5UB-2) of the track. The subcode data of each area consists of 8 blocks of data, and one block consists of 32 symbols (one symbol is 8 bits) of data. Each block is assigned an address from 0 to F (hexadecimal number), and a set of odd symbols and a set of even symbols in two blocks, a block with an even number address and a block with an odd number address that is 1 larger than that block, are assigned one each. Error correction is performed as a unit.

Assuming that the odd symbols are error correction A blocks and the even symbols are error correction B blocks, two error correction blocks A and B exist in the two blocks. Each error correction block consists of 32 symbols, with 28 symbols being data and 4 symbols being parity.

This subcode data contains the program time.

It is possible to record absolute time, TOC information, etc. as a back (PACK). The subcodes are not updated in one frame consisting of two consecutive tracks with different head azimuths. For example, time codes at the same time are recorded on the two tracks. Each pack consists of a 4-bit item (ITEM) and 60-bit data and parity, and the item represents the content (item) of the data. For example, item (0001) is the program time, and (0010) is the absolute time. Each represents (00
00) represents no information (all data are O).

[Problems to be solved by the invention] For example, when a signal reproduced by a first device is transmitted to a second device and recorded by the second device, errors may occur in the data reproduced by the first device. At some point the error will be corrected. A flag F indicating the correction status of this error
a, Fb are transmitted together with the data. Follow? However, the conventional apparatus cannot finally determine the error correction status of the two corresponding blocks unless it receives two flags, and has the disadvantage that it takes time to transmit and process data.

[Means for solving problems]

In a magnetic recording and reproducing system, the present invention configures a subframe format of a transmission interface by at least a preamble, AUX DATA, and audio data, and consists of two blocks: a block with an even number address and a block with an odd number address that is 1 larger than the even address. , is a unit of error correction of subcode data consisting of a plurality of symbols, and among the two blocks constituting the unit, a set of even symbols constitutes a first correction block, and a set of odd symbols constitutes a second correction block. .

The present invention is characterized in that, of the first flag and the second flag representing the correction status of each of the first correction block and the second correction block, the flag with the worse correction status is arranged as AUX DATA. .

[Effect]

At least the preamble, AUX DATA, and audio data constitute a subframe format of the transmission interface.

Addresses are assigned to blocks of subcode data, and two blocks, a block with an even address and a block with an odd address that is one larger than the block, constitute a unit for error correction of the subcode data. Each block of subcode data consists of a plurality of symbols, and a set of even symbols and a set of odd symbols constitute a first correction block and a second correction block, respectively. The flag with the worse correction status of the first flag representing the correction status of the first correction block and the second flag representing the correction status of the second correction block is placed and transmitted as AUX DATA. Ru.

〔Example〕

FIG. 1 is a block diagram when the magnetic recording/reproducing device (magnetic reproducing device) of the present invention is applied to an R-DAT. In the figure, 4 is a memory (RAM).

It stores signals (subcode data) that are reproduced from a magnetic tape (not shown) and input via a data bus. If there is an error in the data stored in the memory 4, a processing circuit (not shown) corrects the error using parity (C1 correction code) included in the data. A C1 correction flag indicating the error correction status is stored in the memory 4. This flag indicates no error, number of corrected data (1 digit, 2
f), it can be used to indicate that it cannot be corrected, etc.

Decoder 1 decodes the input data selection signal,
It is output to the timing signal generation circuit 2.

A timing signal generation circuit 2 generates a predetermined timing signal in response to the output of the decoder 1. The address generation circuit 3 outputs a predetermined address signal in synchronization with the input timing signal. This address signal is supplied to the memory 4 via the address bus, and data at the designated address is read out via the data bus.

The subcode data stored in the memory 4 is structured as shown in FIG. 4, for example. That is, on the magnetic tape, as shown in the 0th and 1st blocks, a total of 56 symbols, 32 symbols of even blocks and 24 symbols up to the 23rd symbol of odd blocks, are used as data, and from the 24th symbol of odd blocks For the 8 symbols up to the 31st symbol, the even symbols are recorded as the parity Pa of the error correction block A, and the odd symbols are recorded as the parity pb of the error correction block B.
The stored data is organized as shown in one, e.g., second and third blocks. Similarly, a total of 56 symbols, 32 symbols of even blocks and 24 symbols of odd blocks, are used as data, but parities Pa and Pb are not stored, and instead, a flag Ft indicating the error correction status is stored.
is memorized. The flag Ft is the error correction block A.
, B indicates the severity of the error correction situation (for example, the one with a larger number of errors or the one that cannot be corrected) among the flags Fa and Fb.

Data read from the memory 4 is latched by the latch circuit 5, and further stored in the shift register 7, which also constitutes the memory. The detection circuit 6 detects a flag from data supplied from the latch circuit 5 or the shift register 7. The detection circuit 6 detects a flag (
For example, when the number of errors is greater than a predetermined reference value or an uncorrectable flag is detected, the multiplexer (MPX) 8 serving as a conversion circuit converts the subcode data output from the shift register 7 into virtually no information. (For example, set all data to O).

A sync generation circuit 10 generates a predetermined sync signal. A process circuit controlled by a microcomputer or the like (not shown)], 1 generates and outputs V, U, and C signals. The (2) signal represents a validity flag regarding the reliability of the audio signal, the U signal represents data for the user (user data), and the C signal represents data regarding the channel status.

The outputs of multiplexer 8 , sync generation circuit 10 and process circuit 11 are selected by multiplexer 9 and supplied to parity generation circuit 12 .

The parity generation circuit 12 applies parity (P) to the input signal.
signal) is added and output to the modulation circuit 13.

The modulation circuit 13 performs pi-phase modulation on the input signal and outputs it to a magnetic recording device (not shown) via a transmission interface. A magnetic recording device processes signals transmitted via a transmission interface and records them on a magnetic tape.

FIG. 3 represents the format of the signals thus transmitted via the transmission interface. That is, 1440 frames of signals are transmitted during one rotation of a drum (not shown) to which a rotary head is attached. Each frame consists of a first channel subframe and a second channel subframe, and each subframe has a 4-bit preamble (sync) and an 8-bit AUX
It is composed of DATA (subcode data), 16-bit audio data, and 1-bit V, U, C, and P data each. The data of the first channel is arranged in a subframe of preamble M, and the data of the second channel is arranged in a subframe of preamble W, respectively. AUX DAT of the first subframe of one revolution
A flag Ft is placed as A, and 32 of the even address blocks are placed as AUXDATA of the following 56 subframes.
The symbol subcode data and the 24 symbol subcode data of odd address blocks are arranged sequentially. Furthermore, the following 7 frames of AUX DA
Uninformed data of odd address blocks as TA (
For example, all 0) are arranged sequentially.

FIG. 2 shows a flowchart when the operation of transmitting data in this manner is executed by a microcomputer or the like. As shown in FIG. 2(a), first, SYNC is sent out.

A sub-flowchart of this sink transmission is shown in FIG. 2(b). That is, a sync is generated by the sync generating circuit 10 and sent out via the multiplexer 9.

Next, it is determined whether the transmission of the 01 correction flag has been completed. No flags have been sent yet in the first subframe of one revolution. Therefore, as shown in the sub-flowchart of FIG. 2(c), for example, the flag Ft detected by the detection circuit 6 is transmitted via the multiplexer 8.9.

Further, like the subcode data, audio (PCM) data stored in the memory 4 (or other memory may be used) and output from the shift register 7 is sent to the multiplexer 8.9.
Sent via . Thereafter, the V, U, and C signals generated by the process circuit 11 are transmitted via the multiplexer 9, and the parity generation circuit 12 generates the parity (P) signal.
signal) is transmitted.

After the data for the first subframe is transmitted in this manner, since the flag transmission has been completed in the second and subsequent subframes, subcode data is transmitted instead of the flag. As for the subcode data, data exists only in the first 24 symbols in an odd block, and since data does not substantially exist in the remaining 7 symbols, all of them are set to O. Furthermore, when data substantially exists, the output of the shift register 7 is transmitted as is when the detection circuit 6 detects the correctable flag, as shown in the subflowchart of FIG. When , substantially all data is set to O.

In this way, the subcode data and audio data are
is transmitted from the magnetic reproducing device to the magnetic recording device via the transmission interface according to the format shown in the figure,
stored in the memory of a magnetic recording device. A magnetic recording device processes the data and records it on magnetic tape.

As is clear from FIG. 3, the flag Ft is transmitted before the subcode data and audio data. Therefore, the recording device first detects the flag Ft, and when the flag indicates that correction is not possible, for example, it stops recording the subcode data of the two corresponding blocks, and the next correctable flag is set for the corresponding two blocks. Record subcode data.

〔effect〕

As described above, in the magnetic recording and reproducing system, the present invention configures the format of a subframe of a transmission interface by at least a preamble, AUX DATA, and audio data, and a block with an even address and a block with an odd address that is one larger than the even address. Two blocks are used as a unit for error correction of subcode data consisting of a plurality of symbols, and among the two blocks constituting the unit, a set of even symbols constitutes a first correction block, and a set of odd symbols constitutes a second correction block. constitutes,
Since the flag with the worse correction status of the first flag and the second flag representing the correction status of each of the first correction block and the second correction block is arranged as AUX DATA, It becomes possible to efficiently transmit and process data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the magnetic recording/reproducing apparatus of the present invention, and FIG.
The figure is a flowchart, FIG. 3 is an explanatory diagram of the transmission format, and FIG. 4 is an explanatory diagram of the subcode data. 1...Decoder 2...Timing signal generation circuit 3...Address generation circuit 4...Memory 5...Latch circuit 6...Detection circuit 7...Φ shift register 8.9...Multiplexer 10...Sink generation circuit 11...Process circuit 12...Parity generation circuit 13...Modulation circuit or higher

Claims (1)

[Claims] At least a preamble, AUXDATA, and audio data constitute a subframe format of a transmission interface, and two blocks, a block with an even number address and a block with an odd number address that is 1 larger than the even number address, are subcode data consisting of a plurality of symbols. of the two blocks constituting the unit, a first correction block is constituted by a set of even symbols, a second correction block is constituted by a set of odd symbols, and the first correction block is The flag with the worse correction status of the first flag and the second flag representing the correction status of each of the AUX and the second correction block is
A magnetic recording and reproducing method characterized by being arranged as DATA.