JPH07118154B2 - Data playback device - Google Patents

Description

The present invention relates to a data recording / reproducing apparatus such as a PCM signal magnetic reproducing apparatus represented by a rotary head type digital audio tape recorder (R-DAT). More specifically, the present invention relates to a data reproducing device adapted to transmit reproduced data to a data recording device such as a PCM signal magnetic recording device.

[Problems to be Solved by Prior Art and Invention]

In the R-DAT, in addition to the main data (PCM audio data), sub data and sub ID for supplementarily adding information to the main data are recorded on the magnetic tape.

A so-called copy in which data obtained by reproducing a magnetic tape on which sub data and sub ID and main data are recorded is recorded by, for example, a PCM signal magnetic recording device to obtain a magnetic tape having the same content as the recorded magnetic tape. In order to do so, it is necessary to transfer the data from the PCM signal magnetic reproducing device to the PCM signal magnetic recording device.

In such a case, a generally considered method is to transmit and record the data reproduced by the PCM signal magnetic reproducing device as it is to all the PCM signal magnetic recording devices. However, the PCM signal magnetic recording device does not have a function to record the reproduced raw data as it is, and therefore the PCM signal magnetic recording device has a necessary portion from the received raw reproduction data, that is, main data, sub data and sub data. It is necessary to add a function to extract the ID and reconstruct the recorded data. Such a function is the same as that for extracting the main data, the sub data and the sub ID from the data reproduced by the PCM signal magnetic reproducing device and processing the signal. To provide
It is wasteful to provide the same function in both the reproducing and recording devices.

Therefore, it is possible to extract the main data, sub data, and sub ID from the reproduction data on the PCM signal magnetic reproduction device side and then directly transmit these to the recording device.However, in this case, the main data and sub data are simply And not only providing a signal line for transmitting the sub ID and
A signal line for transmitting a synchronization signal and the like must be provided, and a problem arises in that a large number of signal lines are required.

Therefore, the present invention makes it possible to transmit main data, sub data, and sub ID extracted from the data reproduced from the magnetic tape by the minimum number of signal lines, and to easily perform recording in a recording device that receives this. An object of the present invention is to provide a data reproducing device that can be performed.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, a data reproducing apparatus according to the present invention comprises main data in which one frame is composed of a predetermined number of data and a sub-data sub-addition unit for adding main information to the main data in units of one frame. In a device for reproducing a magnetic tape on which data and a sub ID are recorded, main data reproduced from the magnetic tape by forming a subframe format of a transmission interface including at least a preamble part, an AUX-DATA part, and a main data part. Is placed in the main data section, and sub data and sub
The AUX-DATA section is provided with data transmission means for arranging and transmitting the ID in units of one frame corresponding to the frame of the main data.

Further, according to the device of the present invention, the sub ID has the program NO and the control ID, and the program NO and the control ID are transmitted only once in one frame of the reproduction data, and the sub-ID is transmitted to the AUX-DATA section. It is characterized in that a flag indicating the status of data correction is further arranged and transmitted.

[Action]

In the above configuration, the data transmission means constitutes a subframe format of a transmission interface including at least a preamble part, an AUX-DATA part, and a main data part, and the subdata and subID and the main data reproduced from the magnetic tape. And AUX-DAT in the above format
The data is arranged in the A section and the main data section in units of one frame corresponding to the main data frame and transmitted. Therefore, from the data reproducing device, the main data, the sub data, and the sub ID of the data reproduced from the magnetic tape are assigned to the respective parts on the sub frame format of the transmission interface and are serially transmitted to, for example, the data recording device. In a data recording device that receives and records the data, a magnetic tape having the same content as the reproduction magnetic tape can be easily obtained without the need for a special additional function, and a signal between the reproduction device and the recording device can be obtained. The minimum number of lines is sufficient.

Further, since the sub ID has the program NO and the control ID and is transmitted only once in one frame of these reproduction data, the work of transmitting and receiving this is reduced accordingly, which is efficient. .

Further, since the flag indicating the correction status of the sub data is transmitted, the sub data recording can be made highly reliable in the device that received the data.

〔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 apparatus which is an embodiment of a data reproducing apparatus according to the present invention. In FIG. 1, 11 is main data composed of PCM audio data,
It is a magnetic tape on which sub data and the like are recorded. The recording format on the magnetic tape 11 is as shown in FIG.

In FIG. 2, 111 and 112 are sub data areas in which sub data is recorded, and 113 is a main data area in which main data composed of PCM audio data is recorded. Sub-data areas 111 and 112 record sub-data for 16 blocks in total, 8 blocks for each track, and main data area 113 for main data for 128 blocks.

As shown in FIG. 3, the format of each of the 16 sub data blocks forming the sub data areas 111 and 112 is sync, sub ID (SW1, SW2), sub ID parity, sub data (SDij, SDij: i = 0 ... 15, j = 0 ... 31), 1 symbol (8 bits) for sync, 1 symbol for sub ID,
The sub ID parity is 1 symbol and the sub data is 32 symbols.

The sub IDs (SW1, SW2) are composed of two even and odd blocks as shown in FIG. 4, and B7 of SW2 is "1" to indicate that the block is a sub data block. SW3 B3, B2, B1 and B0 are 0 to 1 in one track.
It is a bit that represents the block address of 5. The sub data blocks in the sub data area 111 are assigned block addresses 0 to 7, and the sub data blocks in the sub data area 112 are assigned block addresses 8 to 15, respectively. B3, B2, B1, B0 of SW1 of even address block 4
The bit code is the data ID, which is a category code indicating the application of the sub ID and sub data. "0000"
Are for audio, others are spares. Sub ID parity is SW
Error detection code for 1 and SW2, 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, that is, data only and data + parity. Each symbol is 0 along the recording direction
Have a number of ~ 31. Sub data is data (SD _0,0 ~ SD
_{15, 23)} and consists of parity (SP _1,24 ~SP _15,31), sub-data per track has a parity of 448 symbol data and 64 symbols. Parity is used as a data error detection and correction code. The positioning of sub data is as shown in FIG.

When the data ID is "0000", the sub ID is specified by the table as shown in FIG. In the figure, B7, B6, B5 and B in SW1 of the even address block
4 is a control ID, which consists of four independent IDs, namely TOCID, shortening ID, start ID and priority ID. TOCID indicates that the current program is stored in TOC by "1" of B4, "0"
Indicates that it is not stored in the TOC, and the shortening ID is the start of shortening play, that is, 33 ± 3 frames due to B1 of "1" (start ID = 1 at the end of shortening play), and shortening play is set to "0". The start ID is B6.
There is a program start in which 300 ± 30 frames are continuously recorded by "1" of the above, the middle of the program is indicated by "0", and the program ID is recorded by the priority ID of "1" of B7 and well defined. It means that the program NOID is not recorded or is uncertain due to “0”. Priority ID
If "1" is recorded, priority ID "1"
The start point of and the start point of the start ID "1" are the same. The control ID does not change in one frame.

Program NOID 1 to 3 represent 3-digit number, 000 is no program NO, 001 to 799 is program NO represented by 3-digit binary coded decimal number, OAA (A = 1010) is invalid program NO, OBB (B = 1011) is the beginning of the area, OEE (E = 11
10) indicates the end of each area.

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

When the data ID is "0000", the sub-data consists of only packs, and the maximum capacity is 7 packs per 2 blocks. The number of bags actually used is indicated by the bark ID, and the rest of the sub-data pack area is all "0".

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

The above-described data recorded on the magnetic tape 11 is reproduced by the pair of heads 121 and 121 provided on the rotary drum 12. The reproduced data is amplified by the reproduction amplifier 13 and then demodulated by the 10-8 demodulation circuit 14. The demodulated data is input to the memory (RAM) 16 via the data bus 15 and temporarily stored.

When the rotary drum 12 makes one rotation and data of one frame is recorded, the error correction circuit (ECU) 17 corrects the error by using the parity (correction code) included in the data, and The memory 16 stores the C1 correction flag indicating the error status.

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 the data selection signal. This address signal is supplied to the memory 16 via the address bus 19, and the data stored at the specified address is read out via the data bus 15.

The main data and the C1 correction flag read from the memory 16 are supplied to the interface modulation circuit 20. The interface modulation 20 includes a frame sync generation circuit 21, a preamble generation circuit 22, a sub ID detection circuit 23, a sub data generation circuit 24, in addition to the main data and the C1 correction flag.
The outputs of the main data ID detection circuit 25 are input, and these are biphase-modulated and output to another magnetic recording device (not shown).

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

In the preamble part, there are three types of patterns B, W and M. B is CH1 at the beginning of the block and M is C other than the beginning.
H1 and W are added to the head of the subframes of CH2, CH3 ..., Each of which has a pattern as shown in FIG. Also, NRZ "1" and "0" are modulated by T and 2T biphase patterns, respectively, as shown in FIG.

When the data recorded on the magnetic tape 11 is reproduced and transmitted, 1440 rotations of the rotary drum 12 are performed.
It is necessary to transmit a frame signal, and the format at that time is as shown in FIG. And a rotating drum
In the first sub-frame of the first frame of 12 revolutions, as shown in FIG. 13, the main data L ₀ , AUX is added to the PCM data part.
− Program ID ₁ of sub ID and control ID in DATA section
In the next sub-frame, main data R ₀ is assigned to the PCM data part, and sub-ID programs NO2 and NO3 are assigned to the AUX-DATA part. Second
In the third frame and the third frame, L ₁ , R ₁ , L ₂ , and R ₂ are assigned to the PCM data part of each subframe, and AUX-DAT
Nothing is assigned to Part A. Then, in the PCM data part of the first sub-frame of the fourth frame, L ₃ , AUX-DA
TA portions respectively assigned pack ID and data ID of the sub-ID to have assigned to the PCM data portion of the next subframe R _3, AUX-DATA portion C1 flags, respectively.

In the subsequent sub-frame, the main data L
₄ ..., L ₃₁ , R ₄ ..., R ₃₁ are assigned respectively, and sub data are assigned to the AUX-DATA section in the order of packs 1, 3, 5, 7, 7, 2, ₄ , and 6. With the above, transmission of sub-IDs and sub-data for 2 blocks is completed, and transmission of sub-data for the next 2 blocks is performed after the 33rd frame. In this case, as shown in FIG. Program NOID in ID, control
The ID is not transmitted, and only the remaining sub ID and sub data are transmitted. FIG. 14 shows the sub ID and sub data transmitted in the AUX-DATA section per one rotation of the drum, that is, one frame of reproduction data, and the control ID of the sub ID is 1.
Since it does not change during a frame, it is sufficient to transmit only once, and this can reduce the burden on the transmitting side and the receiving side.

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 the preamble generation circuit 22 uses this frame sync as a reference.
Generates one of three patterns at the beginning of each subframe and supplies it to the modulation circuit 20. Then, the sub-ID detection circuit 23 detects the sub-ID in the data read from the memory 16 and determines the predetermined ID data such as various ID data at the head of one rotation of the rotary drum and the head of every two sub-data blocks. Is supplied to the modulation circuit 20 at the timing. Further, the modulation circuit 20 biphase-modulates and transmits the C1 correction flag supplied from the memory 16 at the head of one rotation of the rotary drum. 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 from the memory 16 and supplies the data to the modulation circuit 20 for V, U, C and P.

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

The data transmitted from the reproducing apparatus shown in FIG. 1 is the receiving interface demodulation circuit 3 of the PCM signal magnetic recording apparatus shown in FIG.
It is supplied to 0, where it is bi-phase demodulated and divided into main data, sub data and sub ID, U bit, and C bit. The main data is supplied to the memory (RAM) 31 and temporarily stored. Further, based on the demodulated data, sub data and sub ID are generated by the sub data / sub ID generation circuit 32, and these are stored in the memory 31 via the data bus 33.
And is temporarily stored. The data stored in the memory 31 is subjected to error detection and correction by an error correction circuit (ECU) 34, and C1 and C2 parities are stored in the memory 31.

The C-bit data demodulated by the demodulation circuit 30 is input to the microcomputer (μ-con) 35, and μ
Main ID generation circuit 3 based on the data generated by −con35
The main ID generated by 6 is stored in the memory 31 via the data bus 33.
Memorized in. The u-bit data demodulated by the demodulation circuit 30 is input to the frame sync detection circuit 37, the frame sync detection circuit 37 detects a frame sync based on the u-bit data, and supplies the frame sync to the timing generation circuit 38. The timing generation circuit 38 generates various timing signals based on the frame sync, and uses these as the address control circuit.
Supply to 39. The address control circuit 39 generates an address signal used for writing and reading data in the memory 31 based on the timing signal from the timing generation circuit 38, and supplies the address signal to the memory 31 via the address bus 40. The flag detection circuit 41 detects the C1 correction flag from the sub ID demodulated by the demodulation circuit 30, controls the address control circuit 39 based on the detected flag, and permits or stops writing sub data in the memory 31. To do

The main data, main ID, sub data, and sub ID written in the memory 31 are then read from the memory,
It is 8-10 modulated by the 10 modulation circuit 42, amplified by the recording amplifier 43, and then recorded on the magnetic tape 45 by the heads 441 and 442 on the rotating drum 44.

Since the magnetic reproducing apparatus according to the present invention in FIG. 1 transmits all reproduction data, the magnetic tape 45 recorded in the magnetic recording apparatus in FIG. 15 is completely different from the magnetic tape 11 reproduced in the magnetic reproducing apparatus. They will have the same recorded content. Further, since the correction flag is also transmitted at the same time, it is possible to avoid recording meaningless data in the reproduction data, or to record based on the most reliable data.
It is possible to realize a highly reliable copy of a magnetic tape.

FIG. 16 shows another preferred embodiment when the present invention is applied to a magnetic recording / reproducing apparatus.
20 and reception interface demodulation circuit 30 are digital I / O
The interface 500a is incorporated in the signal processing circuit LSI 500. The signal processing circuit LSI has a signal output terminal OU for sending a signal to other digital audio equipment.
T and a signal input terminal IN for inputting a signal from another digital audio device are provided.

The modulation circuit 20a of the digital I / O interface 500a is the LSI 5
Input the main data, main ID, sub data, sub ID, and frame sync generated by the processing in other parts of 00 to form a transmission interface signal by performing bi-phase modulation, etc. Sent from. The demodulation circuit 30 bi-phase demodulates the signal input to the signal input terminal IN, separates it into main data, main ID, sub data, sub ID, and frame sync and outputs them.
Used for signal processing in other parts of 00.

The digital signal processing circuit LSI 500 having the above-described configuration has a so-called copy function in which a pair of tape decks are housed in a single housing and the data reproduced by one tape deck is recorded by the other tape deck. When applied to the signal processing circuit of the tape deck on the playback side, as shown in Fig. 17
The modulation circuit 20 in the LSI 500 and the demodulation circuit 30 in the signal processing circuit LSI 500 of the recording side tape deck may be directly connected.

With the above configuration, master / slave digital copying can be performed, and it is not necessary to provide an input / output terminal for copying of LSI500 or a new input / output terminal for synchronization. Since the number of input / output terminals is reduced, the number of pins is reduced and the package can be downsized.

[Effect]

As described above, according to the present invention, since all the necessary reproduction data of the magnetic tape is arranged and transmitted in the sub-frame format of the transmission interface, it is special for a device for receiving and recording this. There is no need to add functions, and the signal lines are minimal and better.

Further, according to the present invention, since the arrangement of the sub data and the sub ID is performed for each frame of the reproduction data, the processing when the recording device obtains the magnetic tape having the same content as the reproduction magnetic tape is received. Will be easier.

Moreover, since the sub ID has the program NO and the control ID and these are transmitted only once in one frame of the reproduction data, the work of transmitting and receiving these is reduced accordingly, which is efficient. Moreover, since the flag indicating the correction status of the sub data is transmitted, it is possible to obtain an effect that the recording of the sub data in the device that receives the data can be made highly reliable.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data reproducing apparatus according to the present invention, FIG. 2 is a diagram showing a track format on a magnetic tape in R-DAT, and FIG. 3 is sub-data of each track of FIG. FIG. 4 is a diagram showing a format of sub data blocks forming an area, FIG. 4 is a diagram showing sub IDs (SW1, SW2) formed by combining two sub data blocks of FIG. 3, and FIG. 5 is one track. FIG. 6 is a diagram showing an array of sub-data per hit, FIG. 6 is a diagram showing a sub-data table for a specific data ID, FIG. 7 is a diagram showing arrangement of pack areas, and FIG. 8 is a transmission interface format. FIG. 9, FIG. 9 is a diagram showing a subframe format, FIG. 10 is a diagram showing a preamble pattern in FIG. 8, FIG. 11 is a diagram showing a biphase modulation method, and FIG. 12 is reproduction data. FIG. 13 is a diagram showing a format of a transmission interface for one frame, FIG. 13 is a diagram showing sub-data, sub-ID and main data for one block transmitted in the format of FIG. 12, and FIG. 14 is a format of FIG. FIG. 15 is a block diagram of a PCM signal magnetic recording device for recording by the data transmitted from the reproducing device of FIG. 1, FIG. 16 and 17 are block diagrams showing another embodiment to which the present invention is applied. 16 ... Memory, 17 ... Error correction circuit, 20 ... Transmission interface modulation circuit, 21 ... Frame sync generation circuit,
22 …… Preamble generation circuit, 23 …… Sub ID detection circuit,
24: Sub data generation circuit, 25: Main ID detection circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunichiro Sakamoto 25-1, Nishimachi, Yamada, Kawagoe-shi, Saitama 1 Pioneer Co., Ltd. Kawagoe factory (72) Inventor Takao Arakawa 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa In-house Hitachi Appliances Research Laboratories (72) Inventor Hiroo Okamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock Company Hitachi In-house Appliance Research Laboratories (72) Inventor Yuji Hatanaka 292 Yoshida-cho, Totsuka-ku, Yokohama-shi Kanagawa Home Appliance Research Laboratory (56) Bibliography Sho 63-300466 (JP, U)

Claims (3)

[Claims] 1. Main data in which one frame is composed of a predetermined number of data, and sub data and sub ID for adding auxiliary information to the main data in units of one frame.
In a device for reproducing a magnetic tape on which is recorded, a subframe format of a transmission interface including at least a preamble part, an AUX-DATA part, and a main data part is formed, and main data reproduced from the magnetic tape is converted into the main data. A data reproducing device, wherein the data reproducing device is arranged in a unit, and the sub data and the sub ID are arranged and transmitted in the AUX-DATA unit in units of one frame corresponding to the frame of the main data. 2. The sub ID is program NO and control ID
The data reproducing apparatus according to claim 1, further comprising: a program NO and a control ID, which are transmitted only once per frame of the reproduced data. 3. The data reproducing apparatus according to claim 1, further comprising a flag indicating the status of sub-data correction arranged in the AUX-DATA section for transmission.