JPH0612734A - Signal recording system in dcc system - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a misoperation and a malfunction by detecting the relationship between a recording completion position and a prescribed reference position at the time of the completion of a signal recording operation and automatically selecting an appropriate marker in accordance with the tape remainder. CONSTITUTION:At the time of audio signal recording operation, a recording completion position is detected, the relationship between the recording completion position and a prescribed reference position is judged and when the recording completion position is ahead of the reference position, a user gain marker is recorded on an auxiliary track at the recording completion position. On the other hand, if the recording completion position is after the reference position, a next marker is recorded to an auxiliary track at the recording completion position. When the recording completion position is judged to be ahead of the reference position, a user gain marker is recorded at the program recording completion position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records various sub-codes on one auxiliary track among a plurality of tracks extending in the tape longitudinal direction of a signal recording tape, and records on a plurality of other audio tracks. Relates to a DCC (Digital Compact Cassette) system having a multi-channel head for recording audio signals.

[0002]

2. Description of the Related Art As described in "Nikkei Electronics", September 2, 1991, pp. 134-141, DCC is applicable to cassette tapes having substantially the same shape as analog compact cassette players. , An audio signal is recorded digitally, and the digitized audio signal is data-compressed by high-efficiency coding called PASC method and recorded on an 8-channel audio track of a magnetic tape. Further, in the DCC, signals such as time information and music number information are recorded on a 1-channel auxiliary track of the magnetic tape.

FIG. 2 shows a head assembly (27) equipped in the DCC, which corresponds to one side area of the magnetic tape (22) in the width direction and has a recording thin film multi-head (6) and a channel (9) each. Reproducing thin film multi-heads (7) are arranged. The recording thin film multi-head (6) has an auxiliary head chip (23) at the uppermost stage and eight audio head chips (24) at the lower stage, and the reproducing thin film multi-head (7) is
The auxiliary head chip (25) is provided at the top and the eight audio head chips (26) are provided at the bottom.

Further, the head assembly (27) is equipped with a pair of head chips (28) and (29) for reproducing analog signals, corresponding to the other side area of the magnetic tape (22). By reversing the head assembly (27) 180 degrees,
It is possible to record and reproduce data on both sides A and B of the magnetic tape (22).

The DCC defines the mounting direction of the tape, and when the tape is run, the A surface and the B surface are uniquely determined.

By the way, in the DCC standard, sub-codes such as a marker ID, a sector marker, and a future marker are defined as additional information, in addition to time information and music number information. There are a label ID indicating a part, a sector marker ID indicating a program area, etc., a sector marker includes a reverse marker, a next marker, a home marker, a stop marker, a use again marker, etc., and a future marker includes a skip marker, There are mute markers, etc.

For example, the next marker can be used on both the A side and the B side, and when the marker is detected during reproduction, operation control is performed so that reproduction is started from the head portion of the surface opposite to the present. Be done. Also, the use again marker can be used on both the A side and the B side, and when recorded on the A side, the remaining tape portion on the A side and the B side can be used.
This means that the entire surface can be recorded, and if the recording is on the surface B, it means that the remaining tape portion on the surface B can be recorded.

The user can realize various recording and reproducing operations by recording these markers and IDs on the magnetic tape.

[0009]

However, at present, it is premised that the user manually records various markers and IDs, so that the user is familiar with the functions of various markers and IDs. The recording operation must be performed in a timely manner to record the desired marker or ID. This is extremely complicated and difficult for general users.

For example, when recording a signal on the A side or B side, it is left to the user to decide which marker is to be recorded at the end of recording. There is a problem that the signal recording or reproducing operation is disturbed.

It is an object of the present invention to, when the recording operation on the tape is finished, an appropriate marker is automatically selected according to the remaining tape amount at that time, and the DCC is recorded on the tape.
The purpose of the present invention is to provide a signal recording method for the system, thereby alleviating the complexity of the conventional sub-code assigning procedure and preventing erroneous operation or malfunction during signal recording or signal reproduction.

[0012]

In the signal recording method in the DCC system according to the present invention, the front-rear relationship between the recording end position and the predetermined reference position at the end of the signal recording operation on the A surface or B surface of the tape. Is detected, and if the recording end position is before the reference position, the use-again marker is recorded on the auxiliary track at the recording end position. On the other hand, when the recording end position is after the reference position, the next marker is recorded on the auxiliary track at the recording end position.

[0013]

The predetermined reference position is set at a position separated by a constant distance d from the tape end to the tape start end, and the constant distance d is, for example, one piece of a standard audio signal to be recorded in DCC. The time can be appropriately determined corresponding to a time slightly longer than the recording time (for example, 5 minutes).

The front-back relation between the recording end position and the predetermined reference position is, for example, the difference between the total recording time on one side (A side or B side) of the tape and the time information (absolute time) recorded on the auxiliary track of the tape. This can be easily determined based on the known tape remaining amount detection.

When the signal recording is to be continued for the DCC in which the signal is recorded up to the middle of the tape according to the above-mentioned recording method, first the sub-code recorded in the auxiliary track is searched.

As a result, when the user again marker is detected, if the recording is started from the detected position, the signal can be continuously recorded without the non-recorded portion.

On the other hand, when the next marker is detected on the surface A, the tape is run at high speed from the detection position to the end, and the signal is recorded from the start end of the surface B (end of the surface A). Therefore, the recording operation of one program (musical piece) is not interrupted at the end of the A side.

When a next marker is detected on the A side, for example, during signal reproduction, fast forward is performed to the end of the tape, and reproduction is started from the beginning of the B side. Therefore, the silent reproduction state is shortened as much as possible.

[0019]

According to the signal recording method in the DCC system of the present invention, when the recording operation on the tape is completed, the use-again marker or the next marker is automatically selected according to the remaining tape amount at that time. Since the data is recorded on the tape, the burden on the user due to the addition of the sub-code is reduced as compared with the conventional technique, and erroneous operations and malfunctions during signal recording or signal reproduction are prevented.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the circuit configuration of the DCC system will be described with reference to FIG.

Information signals such as audio signals are input terminals.
The signal is input from (1) to the A / D conversion circuit (2) and converted into a digital signal. The digital signal is supplied to a well-known PASC processing circuit (3), and is subjected to data compression and high efficiency encoding.

The digital signal output from the PASC processing circuit (3) is input to the digital signal processing (4), interleaved, added with an error correction code, and further added with a sub-code, and then a recording amplifier ( After 5), a recording signal for 9 channels is sent to the recording thin film multi-head (6). Then, the recording thin film multi-head (6) records a signal on the magnetic tape (22).

The 9-channel signal reproduced from the magnetic tape (22) by the reproducing thin-film multi-head (7) is supplied to the equalizer circuit (9) through the reproducing amplifier (8) and subjected to waveform equalization. , A PLL clock for data extraction is generated.

The output of the equalizer circuit (9) is sent to the digital signal processing circuit (10) and subjected to processing such as error correction. The processed signal is further supplied to the PASC processing circuit (11), and the original digital signal is obtained after time axis expansion and decoding.

The digital signal is converted into an analog signal through the D / A conversion circuit (12) and output from the output terminal (13) to the subsequent circuit.

The DCC magnetic tape (22) is a reel motor.
(14) and (17) perform winding and rewinding, and the capstan motors (15) and (16) convey the tape. The rotation of the capstan motor (15) (16)
It is controlled by the motor control circuit (18).

A control circuit for controlling the entire system
(19) is equipped with the motor control circuit according to the information from the key input terminal (20) and mechanical switch input terminal (21).
Control signals are issued to mechanisms such as (18), reel motors (14) and (17), and the tape running system.

Furthermore, a code generation / decoding circuit (30) for generating and decoding subcodes such as various markers and IDs is provided, and a subcode is created in accordance with data exchange with the control circuit (19). It is sent to the digital signal processing circuit (4) or the subcode from the digital signal processing circuit (10) is decoded.

Here, the control circuit (19) and the code generation / decoding circuit (30) are not limited to dedicated hardware but can be configured by a microcomputer.

FIG. 3 shows the structure of main data recorded on eight tracks of the magnetic tape. One tape frame is composed of 32 data blocks and an inter-frame gap.
(IFG). The tape block has a header (3
Individual symbols) and a body (48 symbols), and one symbol has 10 bits. Also, one header is divided into a synchronization pattern, a frame address and a block address (previously “Nikkei Electronics”).

Further, FIG. 4 shows the data structure of the subcode recorded on the auxiliary track. In order to suppress errors, the bit rate is reduced to 1/8 of that of the main data. Here, the above-mentioned various markers and IDs are recorded in the body of each tape block.

When the recording mode is set according to the operation key signals and the mechanism detection signals of the operation input terminals (20) and (21) at the time of recording , the recording on the A side is performed under the control of the control circuit (19). At times, the tape (22) runs in the forward direction at the normal 1x speed of the standard mode, and the recording thin film multi-head
(6) scans the upper half of the tape (22). On the other hand, at the time of recording on the B side, the magnetic tape (22) runs in the reverse direction at the reverse speed of the standard mode in the opposite direction, the head assembly is reversed, and the recording thin film multi-head (6) is placed under the tape (22). Scan half.

At this time, for the digital signal processing circuit (4), the subcode generated by the code generation / decoding circuit (30), that is, various IDs such as LABEL indicating the beginning of each song, markers, and time information. , The track number, etc., and the error correction code is added to the subcode information,
It is supplied to the recording thin film multi-head (6) via (5) and recorded on the auxiliary track of the magnetic tape (22).

FIG. 5 shows a subcode recording procedure at the end of audio signal recording, and FIGS. 6 and 7 show a state in which a use-again marker or a next marker is recorded on the magnetic tape 22 by the procedure. There is.

In the present invention, when the recording end operation of the audio signal is performed as shown in FIG. 5, the recording end position is detected, the front-rear relationship between the recording end position and a predetermined reference position is judged, and recording is performed. When the end position is before the reference position, the use-again marker is recorded on the auxiliary track at the recording end position. On the other hand, when the recording end position is after the reference position, the next marker is recorded on the auxiliary track at the recording end position.

FIG. 6 shows a case where it is determined that the recording end position is before the reference position at the end of recording of programs 1 to 4, and a use-again marker is recorded at the recording end position of program 4.

When the program 5 is continuously recorded on the tape, the user again marker is detected as a result of the auxiliary track search, so that the program 5 is continuously recorded from the recording end point of the program 4. It In this case, there is little risk that the tape will end during recording of the program 5.

FIG. 7 shows a case where it is judged that the recording end position is after the reference position at the end of recording of the programs 1 to 4 ', and the next marker is recorded at the recording end position of the program 4'. To be done.

When the program 5 is subsequently recorded on the tape, the next marker is detected as a result of the auxiliary track search, so that the program 4'is fast forwarded from the recording end point to the tape end, and Program 5 is recorded from the beginning of the surface. Therefore, the tape does not end during the recording of the program 5, and the non-recorded portion is shortened to the minimum.

Operation during reproduction The subcode recorded on the magnetic tape (22), that is, various IDs such as LABEL indicating the beginning of each song, markers, time information, track numbers, etc. are reproduced thin film multi-heads.
After being reproduced in (7), error detection and correction are performed in the digital signal processing circuit (10), and the code generation / decoding circuit (3
0).

Then, the code generation / decoding circuit (30) decodes the subcode, and the result is supplied to the control circuit (19), whereby various operation controls are executed.

When the magnetic tape (22) shown in FIG. 7 is reproduced from the A side, the next marker is detected at the end of reproduction of the program 4 ', so that the tape is fast forwarded to the end of the tape and the beginning end of the B side. The reproduction of the program 5 is started from.

Incidentally, when the signal recording is restarted after the recording operation is once ended, when the non-recorded portion is detected during the search of the auxiliary track, the recording operation can be started from the detected position. .

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a DCC system according to the present invention.

FIG. 2 is a perspective view of a head assembly mounted on the DCC.

FIG. 3 is a diagram illustrating a data structure of main data.

FIG. 4 is a diagram illustrating a data structure of sub data.

FIG. 5 is a flowchart showing a recording method of the present invention.

FIG. 6 is a diagram illustrating an example of a recording operation of the present invention.

FIG. 7 is a diagram illustrating another example of the recording operation of the present invention.

[Explanation of symbols]

 (22) Magnetic tape (6) Recording thin film multi-head (7) Reproducing thin film multi-head (30) Code generation / decoding circuit (30)

Claims (1)

[Claims] 1. A sub-code is recorded on one auxiliary track of a plurality of tracks extending in the longitudinal direction of a signal recording tape, and an audio signal is recorded on the other plurality of audio tracks. In a DCC (digital compact cassette) system equipped with a multi-channel head, an audio signal supplied from the outside is
A method of recording on a side A or a side B formed by dividing the tape signal surface into two in the width direction, and at the end of the signal recording operation, the front-back relation between the recording end position and a predetermined reference position is detected, When the recording end position is before the reference position, the use-again marker is recorded on the auxiliary track at the recording end position, and when the recording end position is after the reference position, the auxiliary track is set at the recording end position. A signal recording method in a DCC system characterized by recording a next marker.