JPS63181170A - Magnetic reproducing device - Google Patents

Abstract

PURPOSE:To process a data efficiently by arranging a subcode data sequentially to an AUX DATA at each a symbol and arranging a flag representing the error correcting state of the subcode data in the AUX DATA before the symbol. CONSTITUTION:The format of the subframe of a transmission interface is constituted by at least a preamble, the AUX DATA and an audio data. The subcode data of plural symbols taking a block of an even order address and a block of an odd number address larger by one than the even order address as the error correction unit is arranged sequentially to the AUX DATA at each symbol. Then the flag representing the error correcting state of the subcode data is arranged before the symbol of the AUX DATA. Thus, it is possible to discriminate and receive simply the flag representing the correcting stage of the subcode data at the same location of the subcode data relatingly and the data is sent and processed quickly.

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, a flag indicating the error correction status of subcode data is transmitted at the same position in the format as the subcode data and before the subcode data.

[Conventional technology]

In R-DAT, subcode data is recorded together with PCM audio data. Subcode data is 1
Two areas of the track (SUB-1, 5UB-2
) is recorded. 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 the block with an even number address, are assigned one each. Error correction is performed as a unit.

If the odd numbered symbols are assumed to be error correction A blocks and the even numbered symbols are assumed to be error correction B blocks, then two error correction blocks A and B exist in the two blocks. Each error correction block consists of 32 symbols, 28 symbols being data and 4 symbols being parity.

In this subcode data, program time, absolute time, TOC information, etc. can be recorded as a pack (PACK). The subcodes are not updated within 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) represents program time, (OO10) represents absolute time, and (000
0) represents no information (all data is 0).

[Problem that the invention seeks to solve]

For example, when a signal reproduced by a first device is transmitted to a second device and recorded by the second device, conventionally
The signal reproduced by the first device is transmitted as is to the second device, and processed by the second device. Therefore, it has not been possible to efficiently and quickly transmit and process signals.

[Means for solving problems]

In a magnetic recording and reproducing system, the present invention configures a subframe format of a transmission interface with at least a preamble, AUX DATA, and audio data, and corrects errors in blocks with even addresses and blocks with odd addresses that are 1 larger than the even addresses. Subcode data of multiple symbols in units of AUX DAT
Each symbol is sequentially arranged in A, and AUX DA
The TA is characterized in that a flag indicating the error correction status of the subcode data is placed before the symbol.

[Effect]

At least the preamble, AUX DATA, and audio data constitute the format of the transmission interface. Two blocks of subcode data, a block with an even number address and a block with an odd number address that is 1 larger than the block, are used as a unit of error correction. The subcode data of each block is composed of a plurality of symbols. Each symbol of subcode data is sequentially arranged as AUX DATA on the format. A flag indicating the error correction status of subcode data is also sent to AUX DA.
It is placed before the symbol and transmitted as a TA.

〔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), and a signal (RAM) reproduced from a magnetic tape (not shown) and input via a data bus.
subcode data). 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. The memory 4 stores a 01 correction flag indicating the error correction status. This flag can indicate whether there is no error, the number of corrected data (1, 2), correction is impossible, 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, 32 symbols in even blocks and 24 symbols up to the 23rd symbol in odd blocks, a total of 56 symbols, are used as data, and data starts from the 24th symbol in 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 structured, for example, as shown in the 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 Fa indicating the error correction status is stored.
, Fb are stored. Flags Fa and Fb are flags for error correction blocks A and B, respectively. Or the fourth and fifth
As shown in the block (illustration of 56 symbols of data is omitted), the flag with the worse error correction status (for example, the one with a larger number of errors or the one that cannot be corrected) of the flags Fa and Fb is the flag Ft. is stored as.

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. data (for example, set all data to 0).

A sync generation circuit 10 generates a predetermined sync signal. Further, a process circuit 11 controlled by a microcomputer or the like (not shown) generates and outputs signals ①, U, and C.

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 another 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 the subframe of the preamble M, and the data of the second channel is arranged in the subframe of the preamble W, respectively. AUX of the first two subframes of one revolution
Flags Fa and Fb are arranged as DATA (flag F
t, it is placed in the first subframe), and 32 symbols of subcode data in even address blocks and 24 symbols of subcode data in odd address blocks are sequentially placed as AUX DATA in the subsequent 5G subframe. Ru. Further, data with no information (for example, all O's) is placed in the subsequent 6 (7 in the case of flag Ft) subframes.

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 C1 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 Fa 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, the data for the second subframe is transmitted in the same manner. At this time, flag Fb is used instead of flag Fa.
is transmitted. In the third and subsequent subframes, the sending of the flag has ended, so subcode data is sent instead of the flag. In the subcode data, data exists only in the first 24 symbols in an odd block, and data is substantially absent in the remaining 6 (7 in the case of flag Ft) symbols, so they are all set to 0.

Furthermore, when data actually exists, as shown in the sub-flowchart of FIG. 2(d), when the detection circuit 6 detects a flag that can be corrected, the output of the shift register is transmitted as is; When , the data is substantially all zero.

On the other hand, when sending out the flag Ft, the process shown in FIG. 2 (,) is performed. That is, the flags Fa and Fb are compared, and the flag that is less favorable is set as the flag Ft, and this flag Ft is sent out in place of the aforementioned flag Fa.

In this way, the subcode data and audio data are
The data is transmitted from the magnetic reproducing device to the magnetic recording device via the transmission interface according to the format 1 shown in the figure, and is stored in the memory of the magnetic recording device. A magnetic recording device processes that data.

Record on magnetic tape.

As is clear from FIG. 3, flags Fa-Fb or Ft are transmitted prior to subcode data and audio data. Therefore, the recording device first detects the flags Fa and Fb, and when the flag indicates that the correction is not possible, for example, it stops recording the corresponding two blocks of subcode data, and the next correctable flag is used. Record 2 blocks of subcode data. Even if the first flag Fa sent out indicates that correction is possible, it is not known whether or not the corresponding two blocks of subcode data are correctable unless the next flag Fb is detected. Even if flag Fa indicates that correction is possible, 5 flag Fb
indicates uncorrectability, the two blocks of subcode data eventually include uncorrectable data, that is, erroneous data, and the recording device must detect both flags Fa and Fb. , it is not possible to determine whether two blocks of subcode data are recordable data. Therefore, if the worse of flags Fa and Fb is sent as flag Ft instead of flags Fa and Fb, it is possible to check whether two corresponding blocks of subcode data can be recorded by simply detecting flag Ft. It becomes clear. For example, when the flag Ft indicates that correction is impossible, the recording device immediately shifts to the operation of receiving the next two blocks of data, thereby making it possible to efficiently process the data.

〔effect〕

As described above, the present invention relates to a magnetic recording and reproducing system.

At least the preamble and AUX DATA.

The subframe format of the transmission interface is configured by the audio data, and subcode data of multiple symbols in which the units of error correction are blocks of even addresses and blocks of odd addresses that are 1 larger than the even addresses are sent to AUX DATA sequentially symbol by symbol. At the same time, a flag indicating the error correction status of the subcode data is placed in front of the symbol in AUXDATA, so the flag indicating the correction status of the subcode data is placed in the same position as the subcode data and related. This makes it possible to easily identify and receive data, and to quickly 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, No. 31jA 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...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 a multi-symbol subcode in which a block with an even address and a block with an odd address that is 1 larger than the even address are units of error correction. A magnetic recording and reproducing method characterized in that data is sequentially arranged in the AUXDATA for each symbol, and a flag indicating the error correction status of the subcode data is arranged in front of the symbol in the AUXDATA.