JPH01258271A - Pcm signal magnetic regenerating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a PCM signal magnetic reproducing device typified by a rotary head digital audio tape recorder (R-DAT). For example, PCM
The present invention relates to a PCM signal magnetic reproducing device configured to transmit a signal to a signal magnetic recording device.

[Prior art and problems to be solved by the invention] R-D
In AT, in addition to main data (PCM audio data), sub-data, sub-ID, etc. that add supplementary information to the main data are recorded on the magnetic tape.

For example, the data obtained by reproducing the magnetic tape on which the sub data, sub ID, and main data are recorded is stored on a PC.
When attempting to perform so-called copying, in which a magnetic tape is recorded using an M-signal magnetic recording device and has the same content as the already recorded magnetic tape, the data is transferred from the PCM signal magnetic reproducing device to the PCM
It becomes necessary to transmit the signal to a magnetic recording device.

In such a case, a commonly considered method is to transmit all of the data reproduced by the PCM signal magnetic reproducing device to the PCM signal magnetic recording device and record it as is. However, PCM signal magnetic recording devices do not have the ability to record the raw data that has been reproduced as is, and therefore
It is necessary to add a function to the CM signal magnetic recording device to reconstruct recorded data by extracting necessary parts, ie, main data, sub data, and sub ID, from the raw reproduction data taken. Such a function is the same as that for signal processing by extracting main data, sub data, and sub ID from the data reproduced by the PCM signal magnetic reproducing device, and such a function is provided in the PCM signal magnetic recording device. Providing the same function would be wasteful since the same function would be provided in both the playback and recording devices.

Therefore, it is conceivable that the PCM signal magnetic reproducing device side extracts the main data, sub data, and sub ID from the reproduced data and then transmits them as is to the recording device, but in this case, the main data and sub data are simply In addition to providing a signal line for transmitting the sub ID and sub-ID, it is also necessary to provide a signal line for transmitting a synchronization signal, etc., resulting in the problem of requiring a large number of signal lines. .

Therefore, the present invention makes it possible to transmit main data, sub data, and sub ID extracted from data reproduced from a magnetic tape using a minimum number of signal lines, and to record the data in the recording device that received the data. It is an object of the present invention to provide a PCM signal magnetic reproducing device that can be easily performed.

[Means to solve the problem]

PCM made according to the present invention to solve the above problems
The signal magnetic reproducing device has main data, sub-data for adding auxiliary information to the main data, and sub-ID.
In a device that plays back a magnetic tape recorded with
Configure a subframe format of a transmission interface consisting of an M data section, and place subdata, sub ID, and main data reproduced from the magnetic tape in the AUX-DATA section and PCM data section on the subframe format, respectively, and transmit. The invention is characterized by comprising a data transmission means for transmitting data.

Further, according to the apparatus of the present invention, sub data and sub ID are arranged in the AUX-DATA section in units of one frame of playback data, and the sub ID has a program number and a control ID, and these program numbers and The present invention is characterized in that the control ID is transmitted only once in one frame of reproduced data, and that a flag indicating the status of sub-data correction is further placed in the AUX-DATA section for transmission.

[For production]

In the above configuration, the transmission means configures a subframe format of a transmission interface consisting of at least a preamble section, an AUX-DATA section, and PCM data, and transmits subdata, subID, and main data reproduced from a magnetic tape. , AUX- in the above format
The data is placed and transmitted in the DATA section and the PCM data section, respectively.

Therefore, from the PCM signal magnetic reproducing device, the main data, sub data, and sub ID of the data reproduced from the magnetic tape are assigned to each part on the subframe format of the transmission interface and serially transmitted to, for example, the PCM signal magnetic recording device. Therefore, there is no need to add any special functions to the PCM signal magnetic recording device that receives and records this signal, and the number of signal lines can be kept to a minimum.

Also, change the arrangement of sub data and sub ID to 1 of the playback data.
Since this is done on a frame-by-frame basis, the processing when the recording device receives these and obtains a magnetic tape with the same content as the reproduced magnetic tape is simplified.

Furthermore, the sub ID is the program NO and control ID.
Since these are transmitted only once per frame of reproduced data, the work of transmitting and receiving them is eliminated, which is efficient.

Furthermore, since a flag indicating the correction status of the sub-data is transmitted, the recording of the sub-data by the device receiving the data can be made highly reliable.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an R-DAT reproducing device which is an embodiment of the PCM signal magnetic reproducing device according to the present invention.
In the figure, numeral 11 is a magnetic tape on which main data, sub data, etc. consisting of PCM audio data are recorded. The recording format on the magnetic tape 11 is the second
It is as shown in the figure.

In FIG. 2, 111 and 112 are sub-data areas where sub-data are recorded, and 113 is a main data area where main data consisting of PCM audio data is recorded. Sub data areas 111 and 112
has a total of 16 blocks, each with 8 blocks per track.
The sub data for the block is also stored in the main data area 1.
13 has 128 blocks of main data recorded therein.

The format of each of the 16 sub data blocks that make up the sub data areas 111 and 112 is as shown in FIG.
D parity, sub data (SDij, 5Pij: i=
0...15. j=o...31), the sync consists of one symbol (8 bits), the sub 10 consists of one symbol, the sub ID parity consists of one symbol, and the sub data consists of 32 symbols.

The sub ID (SWI, 5W2) is composed of two blocks, an even number and an odd number, as shown in Figure 4, and 87 of SW2 is "1".
” indicates that the block is a sub-data block. SW2 B3. B2. Bl and B
O is a bit representing a block address of 0 to 15 in one track. The sub data blocks in the sub data area 111 are given block addresses 0 to 7, and the sub data blocks in the sub data area 112 are given block addresses 8 to 15, respectively.

B3 of SWI of even address block. B2. B1, B
The 4-bit code of O is the data ID, which is the sub-I
This is a category code indicating the application of D and sub-data. roooOJ is for audio, and the others are spares. The sub ID parity is an error detection code for SWI and SW2, and the sub ID parity=SW■SW2 (■ is mode 2).

One sub data block has 32 symbols of sub data, and there are two types of blocks: data only and data parity. Each symbol has a number from 0 to 31 along the recording direction.

Sub data is data (SD,...~SD+s,z:+)
and parity (SP+, ga to 5 PIS, 31), and the sub data per track has 448 symbols of data and 64 symbols of parity. Parity is used as a data error detection and correction code. The positioning of the sub data is as shown in FIG.

When the data ID is ro 000J, the sub ID is specified by a table as shown in FIG. In the same figure, B in SWI of even address block
7. B6. B5 and B4 are control IDs, which consist of four independent IDs: TOC ID, shortening ID, start ID, and priority ID.

TOCID indicates that the current program is T by rlj of B4.
The shortening ID indicates that it is stored in the OC, °0'' indicates that it is not stored in the TOC, and the shortening ID is ``1'' in B5, indicating the start of shortening play, that is, 33
There are ±3 frames (the end of shortening play is start ID - 1), "0" indicates that there is no start of shortening play, and start ID is "0" in B6.
1" indicates that there is a program start in which 300 ± 30 frames are consecutively recorded, "0" indicates the middle of the program, and the priority ID is "1" of B7 indicates that the program N0 ID is recorded and is well defined. "0" indicates that the program N0ID is not recorded or is uncertain. If priority ID "1" is recorded, the start point of priority IDrlJ and start ID rl,
The starting point is the same. The control ID does not change in one frame.

Program N0IDI~3 represents a 3-digit number, 000
must have no program number, 001 to 799 must be 3 digits 2
Program N02OAA expressed in evolved decimal (A=
1010) is the disabled program N01OBB (
B=1011) is the beginning of the area, OEE (E=111
0) represents the end of the area.

The pack ID indicates the number of packs included in the subdata of two blocks starting with an even block.

When the data ID is roooo, +, the sub data consists only of packs, and the maximum capacity is 7 packs per 2 blocks. The number of packs actually used is indicated by the pack ID, and the rest of the subdata puncture area is all "0".
be made into

The pack ID of SW2 indicates the number of packs included in the subdata, and pack areas 1 to 7 are arranged as shown in FIG. Pack data is recorded continuously according to area numbers.

The above-mentioned data recorded on the magnetic tape 11 is transferred to a pair of heads 12 provided on a rotating drum 12.
1 and 121.

The reproduced data is amplified by a reproduction amplifier 13 and then demodulated by a 10-8 demodulation circuit 14.

The demodulated data is sent to the memory (R
AM) 16 and is temporarily stored.

When the rotating drum 12 rotates once and one frame of data is recorded, the error correction circuit (ECU) 17 corrects the error using the parity (correction code) included in the data. A 01 correction flag indicating the error situation is stored in the memory 16.

The address control circuit 18 generates a predetermined address signal in synchronization with a predetermined timing signal generated by a decoder (not shown) based on a data selection signal. This address signal is supplied to the memory 16 via the address bus 19,
The data stored at the designated address is read out via the data bus 15.

The main data and C1 correction flag read from the memory 16 are supplied to the interface modulation circuit 20.

The interface modulation 20 includes the main data and 0
In addition to the 1 correction flag, the outputs of the frame sync generation circuit 21, preamble generation circuit 22, sub ID detection circuit 23, sub data generation circuit 24, and main data ID detection circuit 25 are input, and these are pie-phase modulated and shown in the figure. output to other magnetic recording devices.

FIG. 8 shows the format of the signal output from the modulation circuit 20 and transmitted to another magnetic recording device. In the figure, the format is completed with 192 frames, and each frame is composed of two subframes. As shown in Fig. 9, the format of each subframe is a preamble section to which 4 time slots are assigned, an AUX-DATA section to which 8 time slots are assigned, a PCM data section to which 16 time slots are assigned, and the remaining 4 time slots.
It consists of 32 slots including time slots. In the remaining time slots, ■ is a bit indicating validity, U is a user's pit, and C is a channel status bit. These are used in units of 192 frames, and P
is a parity pit.

There are three types of patterns in the preamble part: B, W, and M. B is CHI at the beginning of the block, M is CHI other than the beginning, W is CH2, CH3, etc. at the beginning of the subframe. Each of them has a pattern as shown in FIG. Also, NRZ's "1",
"0" is rotated in a bi-phase pattern of T and 2T, respectively, as shown in FIG.

When reproducing and transmitting data recorded on the magnetic tape 11, it is necessary to transmit a signal of 1440 frames during one revolution of the rotating drum 12, and the format at that time is shown in FIG. It comes to show. In the first subframe of the first frame of one revolution of the rotary drum 12, as shown in FIG. 13, the main data L is assigned to the PCM data section, and the sub ID program NO. , In the next subframe, the main data R is stored in the PCM data section, and the program N of the sub ID is stored in the AUX-DATA section.
O2 and program No. 3 are respectively assigned. In the second and third frames, L+, R1, R2, R2 are added to the PCM data part of each subframe.
is assigned, and nothing is assigned to the AUX-DATA section. Then, R3 is placed in the PCM data section of the first subframe of the fourth frame, and sub-I is placed in the AUX-DATA section.
D's pack ID and data! D respectively, and R1 and AUX-DA are assigned to the PCM data part of the next subframe.
The 01 flag is assigned to each TA section.

In the subsequent subframes, main data L4...s R31+R4..., R3, is assigned to the PCM data section, and sub data is assigned to the AUX-DATA section, back 1, 3, 5, 7, 2, 4. They are assigned in the order of .6. As described above, the transmission of the sub ID and sub data for two blocks is completed, and the transmission of the next two blocks of sub data is performed from the 33rd frame onwards.
As shown in the figure, the program N0 ID and control ID in the sub ID are not transmitted, and only the remaining sub ID and sub data are transmitted. Figure 14 shows drum 1
AUX-DA per rotation or one frame of playback data
Indicates the sub-ID and sub-data transmitted in the TA section, and since the control ID of the sub-ID does not change in amount per frame, it is sufficient to transmit it only once, thereby reducing the burden on the transmitting and receiving sides. be able to.

In order to do the above, the frame sync generation circuit 21 generates a frame sync in synchronization with the rotation of the rotary drum 12, and based on this frame sync, the preamble generation circuit 22 generates three types of patterns at the beginning of each subframe. One is generated and supplied to the modulation circuit 20. Then, the sub-ID detection circuit 23 detects the sub-ID in the data read out from the memory 16, and at the beginning of one revolution of the rotating drum and the beginning of every two blocks of sub-data, predetermined information such as various ID data of the sub-ID is detected. The signal is supplied to the modulation circuit 20 at the timing of .

Further, the modulation circuit 20 biphasically modulates the 01 correction flag supplied from the memory 16 at the beginning of one rotation of the rotary drum and transmits it. Further, the sub-data generation circuit 20 generates sub-data, that is, pack data 1 to 7, at a predetermined timing based on the data read from the memory 16, and supplies this to the modulation circuit 20. The main data ID detection circuit 25 detects various data based on the data read out from the memory 16 and outputs V, U.

It is supplied to the modulation circuit 20 for C and P.

The modulation circuit 20 is supplied with main data read from the memory 16, performs biphase modulation on the main data, and transmits the biphase modulated data to the outside.

The data transmitted from the first playback device is
The PCM signal is supplied to the reception interface demodulation circuit 30 of the magnetic recording device shown in the figure, where it is biphase demodulated to main data, sub data, sub ID, U bit, C
Divided into bits.

The main data is supplied to a memory (RAM) 31 and temporarily stored. Further, based on the demodulated data, the sub data and sub ID are generated by the sub data/sub ID generation circuit 32.
These are supplied to the memory 31 via the data bus 33 and stored therein. The data stored in the memory 31 is subjected to error detection and correction by an error correction circuit (EC1J) 34, and CI and C2 parity are stored in the memory 31.

The C-bit data demodulated by the demodulation circuit 30 is input to the microcomputer (μmcon) 35, and the main ID generated by the main ID generation circuit 36 based on the data issued by the μ-con 35 is input to the data bus 33. The data is stored in the memory 31 via. The U-bit data demodulated by the demodulation circuit 30 is sent to the frame sync detection circuit 37.
The frame sync detection circuit 37 detects frame sync based on this U-bit data and supplies it to the timing generation circuit 38. The timing generation circuit 38 generates various timing signals based on the 7 frame sync and supplies them to the address control circuit 39. Based on the timing signal from the timing generation circuit 38, the address control circuit 39 generates an address signal used when writing or reading data to the memo IJ 31, and supplies this to the memory 31 via the address bus 40.

The flag detection circuit 41 detects the 01 correction flag from the sub-ID demodulated by the demodulation circuit 30, controls the address control circuit 39 based on the detected flag, and allows or stops writing sub-data to the memory 31. I do things.

Main data written in the memory 31, main ID,
The sub data and sub ID are then read out from the memory, 8-10 modulated by the 8-IO modulation circuit 42, amplified by the recording amplifier 43, and then sent to the head 441 on the rotating drum 44.
, 442 on the magnetic tape 45.

Since the magnetic reproducing apparatus according to the present invention shown in FIG. 1 transmits all of the reproduced data, the magnetic tape 45 recorded in the magnetic recording apparatus shown in FIG. 15 is completely identical to the magnetic tape 11 reproduced by the magnetic reproducing apparatus. They will have the same recorded content. In addition, since the correction flag is also transmitted at the same time, it is possible to avoid recording meaningless data among the reproduced data, or to record based on the most reliable data, making it possible to create highly reliable magnetic tapes. Copying can be accomplished.

FIG. 16 shows another preferred embodiment when the present invention is applied to a magnetic recording/reproducing device, in which a transmission interface modulation circuit 20 and a reception interface demodulation circuit 30 are built into a signal processing circuit LSI 500 as a digital I10 interface 500a. There is. LS for signal processing circuits
I is provided with a signal output terminal OUT for sending signals to other digital audio equipment and a signal input terminal IN for inputting signals from other digital audio equipment.

Modulation circuit 2 of digital I10 interface 500a
0a is main data, main ID, sub data, sub ID generated by processing in other parts within the LSI 500
, frame sync is input, bi-phase modulation is performed, etc. to form a transmission interface signal, and the signal is sent out from the signal output terminal OUT. The demodulation circuit 30 has a signal input terminal I
After bi-phase demodulating the signal input to N, it is separated into main data, main ID, sub data, sub ID, and frame sync and output, and is used for signal processing in other parts of the LSI 500.

The LSI 500 for digital signal processing circuits having the above-mentioned configuration was applied to an R-DAT which houses a pair of tape decks in a single housing and has a so-called copy function in which data played back on one tape deck is recorded on the other tape deck. In this case, as shown in FIG. 17, the modulation circuit 20 in the signal processing circuit LSI 500 of the tape deck on the playback side and the demodulation circuit 30 in the signal processing circuit LSI 500 of the tape deck on the recording side may be directly connected.

The above configuration makes it possible to perform master-slave digital copying, eliminating the need to provide input/output terminals for copying of the LSI500 or new input/output terminals for synchronization. The number of input/output terminals is reduced, so the number of pins is reduced.
Effects such as the possibility of reducing the size of the package can be obtained.

〔effect〕

As explained above, according to the present invention, all the necessary parts of the playback data of the magnetic tape are arranged and transmitted in the subframe format of the transmission interface, so that the data can be received by the device for recording, for example. There is no need to add special functions, and the number of signal lines is minimized.

Further, according to the present invention, since the sub data and sub ID are arranged in units of one frame of the reproduced data, processing is performed when the recording device receives these and obtains a magnetic tape with the same content as the reproduced magnetic tape. The sub-ID has a program number and a control ID, and these are transmitted only once per frame of playback data, so the work of transmitting and receiving them is eliminated.
It is efficient, and since a flag indicating the correction status of the sub-data is transmitted, it also has the effect of making it possible to record sub-data with high reliability in the device that receives the data. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the PCM signal magnetic reproducing device according to the present invention, FIG. 2 is a diagram showing the track format on the magnetic tape in R-DAT, and FIG. 3 is a diagram showing the track format of each track in FIG. Figure 4 is a diagram showing the format of the sub data blocks that make up the sub data area. The figure shows the arrangement of sub-data per track, Figure 6 shows the table of sub-data for a specific data ID, Figure 7 shows the arrangement of pack areas, and Figure 8 shows the transmission Figure 9 shows the format of the interface, Figure 9 shows the format of the subframe, Figure 10 shows the format of the subframe.
The figure shows the preamble pattern in Figure 8, Figure 11 shows the method of bi-phase modulation, Figure 12 shows the format of the transmission interface for one frame of reproduced data, and Figure 13. is a diagram showing two blocks of sub data, sub ID, and main data transmitted using the format shown in Fig. 12. Fig. 14 shows one frame of sub data and sub 10 playback data transmitted using the format shown in Fig. 12. FIG. 15 is a block diagram of a PCM signal magnetic recording device that performs recording using data transmitted from the reproducing device of FIG. It is a block diagram showing an example. 16...Memory, 17...Error correction circuit, 2o...
- Transmission interface modulation circuit, 21... Frame sync generation circuit, 22... Preamble generation circuit, 2
3... Sub ID detection circuit, 24... Sub data generation circuit, 25... Main ID detection circuit. 8 9 10 11 12 13 14
15 ■Figure Preamble sync 3T TT 3T 3T TT
3T “B””-1-Lf1--fAlso: Yoshi-111 “1”-m-]-3T 3TT
3T 3TTT“M” go-ori-11-f]-“or 1-111”-m-t”-L3T
2TT2T 3T 2TT2T"W
” -111-"-rim-"or]-111-
-L"--L after biphase modulation T T "1"-"l"-or]-"L2T
2T Figure 11 Figure 12

Claims (4)

[Claims] (1) In an apparatus for reproducing a magnetic tape on which main data, sub data for adding auxiliary information to the main data, and a sub ID are recorded, at least a preamble section, an AUX-DATA section, and a PCM data section are provided. A subframe format of a transmission interface is configured, and the subdata, subID, and main data reproduced from the magnetic tape are placed in the AUX-DATA section and the PCM data section on the subframe format, respectively, and transmitted. A PCM signal magnetic reproducing device comprising a data transmission means. (2) Sub data and sub ID to AUX-DATA section
2. The PCM signal magnetic reproducing apparatus according to claim 1, wherein the arrangement is performed in units of one frame of reproduced data. (3) Sub ID is program NO and control ID
3. The PCM signal magnetic reproducing apparatus according to claim 2, wherein the program number and control ID are transmitted only once per frame of reproduced data. (4) The PCM signal magnetic reproducing apparatus according to claim (1), wherein a flag indicating the status of sub-data correction is further placed in the AUX-DATA section for transmission.