JPH06139755A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To proyide a digital compact cassette(DCC) system which starts time information from absolute time [0:00:00:0] in the case of recording a side B and does not miss a next marker at the time of ending the recording of a side A even when the recording of the side B is started without recording the next marker at the time of ending the recording of the side A of a tape. CONSTITUTION:When a user does not perform the recording operation of the next marker after the recording of the side A is completed, recording is started from the leading part of recording start of the side B at the absolute time [0:00:00:0] by judging the existence of the next marker at the recording end position of the side A. When the recording of the side B is completed, editing work such as the rearrangement of music numbers (called renumbering) is performed and when the next marker does not exist at the recording end part of the side A although the time information is started from the absolute time [0:00:00:0] for both of sides A and B, the next marker is automatically recorded.

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. The present invention relates to a DCC (Digital Compact Cassette) system having a multi-channel head for recording an audio signal.

[0002]

2. Description of the Related Art As described in "Nikkei Electronics" September 2, 1991, pp. 134-141, DCC is a cassette tape of approximately the same size as an analog compact cassette player. On the other hand, an audio signal is recorded by a digital method, and a digitized audio signal is data-compressed by a high efficiency encoding called PASC 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 installed in the DCC, which has a recording thin film multi-head 6 and a reproducing thin film multi-head 7 each consisting of 9 channels corresponding to one side area of the magnetic tape 22 in the width direction. It is arranged.

The recording thin-film multi-head 6 is provided with 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 provided with an auxiliary head chip 25 at the uppermost stage. , 8 audio head chips 26 are provided in the lower stage.

Further, the head assembly 27 is equipped with a pair of head chips 28 and 29 for reproducing an analog signal corresponding to the other side area of the magnetic tape 22.
By rotating the head assembly 27 by 180 degrees, recording and reproduction can be performed on both the A side and the B side 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, additional information other than time information and music number information, a marker ID,
Subcodes such as sector markers and future markers are defined. The marker ID includes a label ID indicating the beginning of a song, a sector marker ID indicating a program area, and the like, and the sector marker includes a reverse marker, a next marker, a home marker, a stop marker, a use again marker, and the like. Future markers include skip markers and mute markers.

For example, the next marker can be used on both the A side and the B side, and when the marker is used during reproduction, operation control is performed so that reproduction is started from the head portion of the surface opposite to the present. .

Also, the use again marker can be used on both sides A and B, and the marker is A
If it is recorded on the side B, it means that the remaining tape portion of the side A and all of the side B can be recorded. If it is recorded on the side B, the remaining tape portion of the side B is recorded. It means recordable.

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

[0011]

However, at present, since it is premised that a user manually records the above-mentioned various markers and IDs,
The user is familiar with the functions of various markers and IDs,
It is necessary to record the desired marker or ID by performing a recording operation in a timely manner. For this reason, there are problems that the operation is complicated and that a trouble or the like occurs due to the incorrect recording of the marker or the ID.

FIG. 3 is a diagram showing the operation of the next marker. When the tape 22 is reproduced from the side A, the next marker recorded at the end of reproduction of the program 4 is detected to reach the end of the tape. Fast-forwarding is performed, the head assembly 27 is rotated 180 degrees, and the tape is driven in the reverse direction to reproduce the program 5 from the start end of the B side.

By the way, the time information is the program 1 of the A side.
Is recorded from the absolute time [0: 00: 00: 00] at the beginning of the program, and is continuously recorded up to the end of the program 4 on the A side, and again at the beginning of the program 5 on the B side. : 00: 00: 0].

Therefore, if the programs on the A side and B side are completely different, that is, the program on the A side and the program on the B side are not continuous contents, the next marker is used to automatically terminate the program on the A side. And immediately B
Suitable for playing from the beginning of the surface program.

In order to perform such an operation, the user records the next marker at the time when the recording on the side A is completed, and then fast forwards the tape to the end of the side A (= the beginning of the side B). After that, it is necessary to start recording on the B side.

However, if the user resumes recording from the B side of the tape without recording the next marker at the end of the program 4 on the A side, the recording is interrupted midway, and the DCC standard In such a case, the time information is not recorded in such a case. Therefore, B
This causes an inconvenience that time information is not recorded on the surface.

[0017]

In order to solve the above problems, 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, In a DCC (Digital Compact Cassette) system equipped with a multi-channel head for recording audio signals on a plurality of other audio tracks, an audio signal supplied from the outside is divided into two in the width direction of the tape signal surface. Is a method of recording on the A side or B side formed by
The time information recorded on the surface is [0: 00: 00: 00]
If the next marker is not recorded at the recording end portion of the A side, the next marker is automatically recorded at the recording end portion of the A side. It is intended to be provided.

[0018]

With the above-mentioned structure, the tapes A and B
The time information recorded on the surface is [0: 00: 00: 00]
If the next marker is not recorded at the recording end portion of the A side, the next marker is automatically recorded at the recording end portion of the A side.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. First, FIG. 1 is a diagram showing a circuit configuration of a DCC system. Information signals such as audio signals are
It is input from the input terminal 1 to the A / D conversion circuit 2 and converted into a digital signal. The digital signal is supplied to the PASC processing circuit 3 and is subjected to data compression and high efficiency coding.

The digital signal output from the PASC processing circuit 3 is input to the digital signal processing circuit 4, subjected to interleaving, addition of an error correction code, and further addition of a subcode, and further, through the recording amplifier 5, 9 It is sent to the recording thin film multi-head 6 as a recording signal for channels. 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 via the reproducing amplifier 8 for waveform equalization and 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 is subjected to time axis expansion and encoding to become the original digital signal.

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 taken up and rewound by the reel motors 14 and 17, and the tape is conveyed by the capstan motors 15 and 16. The rotation of the capstan motors 15 and 16 is controlled by the motor control circuit 18.

Further, a control circuit 19 for controlling the entire system is provided, and in accordance with information from the key input terminal 20 and the mechanical switch input terminal 21, the motor control circuit 18, the reel motors 14, 17, the tape running system, etc. Control signals to the respective mechanisms.

Further, a code generation / decoding circuit 30 for generating and decoding sub-codes such as various markers and IDs is provided, and a sub-code is created according to data exchange with the control circuit 19 to generate a digital signal processing circuit 4. Or the subcode from the digital signal processing circuit 10 is decoded.

FIG. 4 shows the structure of main data recorded on 8 tracks of the magnetic tape. One tape frame is composed of 32 data blocks and an interframe gap (IFG). The tape block is composed of a header (3 symbols) and a body (48 symbols), and one symbol is 10 bits.

Further, one header includes a synchronization pattern,
Divided into frame address and block address (above-mentioned "Nikkei Electronics").

FIG. 5 shows the data structure of the sub-code 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 on the body of each tape block.

Here, the information contained in the subcode will be described in detail. The subcode information is divided into system information and auxiliary information. The system information is sub data recorded in the above-mentioned main data of 8 channels, and includes copy information, tape format information, and character information.

On the other hand, the auxiliary information is sub-data recorded on the auxiliary track of the above-mentioned channel 1, which is time information, track number. (Song number), marker information, TOC information, etc. are included. The markers included in the marker information include start markers, sector markers, and future markers. Among these, a lead-in, a lead-out, a reverse marker, a next marker, a home marker, a stop marker, and a use again marker are set in the sector marker, and a future marker includes a skip marker, a mute marker, and a fade marker.

Next, the operation during recording and reproduction in this DCC system will be described.

[Operation at the time of recording] When the recording mode is set according to the operation key signal and the mechanism detection signal of the input terminals 20 and 21, the tape is recorded at the time of recording on the surface A under the control of the control circuit 19. The recording thin film multi-head 6 scans the upper half portion of the tape 22 while the recording medium 22 travels in the normal direction at the normal speed of the normal mode. On the other hand, at the time of recording on the B side, the magnetic tape 22 travels in the reverse direction at the reverse speed of the standard mode, the head assembly is reversed, and the recording thin film multi-head 6 scans the lower half of the tape 22.

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

In the present invention, if the user does not perform the recording operation of the next marker after the recording of the A side, it is considered that the next marker is present at the recording end position of the A side, and B Time information is recorded from the absolute time [00: 00: 00: 0] from the beginning of the recording start of the surface. Then, when recording on side B is completed, editing work such as rearranging song numbers (this is called renumbering) is performed, and
The time information is absolute time [00: 00: 0: 00:
[0], the next marker is automatically recorded when there is no next marker at the recording end portion of the A side.

FIG. 6 is a flow chart showing the operation at the start of recording on the B side. First, if it is the head of the B side (S1), the time information is set to the absolute time [0: 00: 00: 0]
(S2), and the recording mode is set (S3).

FIG. 7 is a flowchart showing the operation when the side B recording is completed and the editing work is being performed. First B
It is checked whether the head of the surface recording starts at the absolute time [0: 00: 00: 00] (S1), and the absolute time [0: 0]
If the recording is started from [0: 00: 0], it is checked whether or not there is a next marker at the recording end portion of the A side (S2). If there is no next marker, the next marker recording mode for the A side is set (S3).

[Operation During Reproduction] The sub-code recorded on the magnetic tape 22, that is, various IDs such as labels indicating the beginning of each song, markers, time information, track numbers, etc. are recorded in the reproducing thin film multi-head 7. After being reproduced, the digital signal processing circuit 10 performs error detection and correction,
It is supplied to the code generation / decoding circuit 30.

Then, the code generation / decoding circuit 30 decodes the sub-code and supplies the result to the control circuit 19, whereby various operation controls are executed.

[0040]

As described above in detail, according to the present invention, of the plurality of tracks extending in the tape longitudinal direction of the signal recording tape, one sub-track is recorded with various sub-codes, and other sub-codes are recorded. DCC with multi-channel head for recording audio signals on multiple audio tracks
In a (digital compact cassette) system, an audio signal supplied from the outside is recorded on a surface A or a surface B formed by dividing the tape signal surface into two in the width direction. If the time information recorded on side A and side B starts from [00: 00: 00: 00] and no next marker is recorded at the end of recording on side A, the next marker is set to A. Since the recording is automatically performed on the recording end portion of the side B, even if recording is started on the side B without recording the next marker at the end of the recording on the side A of the tape, the recording on the side B The time information starts from the absolute time [00: 00: 00: 00], and the next marker is not lost at the end of recording on the A side.

[Brief description of drawings]

FIG. 1 is a block diagram showing the 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 the operation of a next marker.

FIG. 4 is a diagram showing a structure of main data.

FIG. 5 is a diagram showing a structure of auxiliary data.

FIG. 6 is a flowchart illustrating the operation of the present invention.

FIG. 7 is a flowchart illustrating the operation of the present invention.

[Explanation of symbols]

 1 Input Terminal 2 A / D Conversion Circuit 3 PASC Processing Circuit 4 Digital Signal Processing Circuit 5 Recording Amplifier 6 Recording Thin Film Multihead 7 Reproducing Thin Film Multihead 8 Reproducing Amplifier 9 Equalizer Circuit 10 Digital Signal Processing Circuit 11 PASC Processing Circuit 12 D / A Conversion circuit 13 Output terminal 14 Reel motor 15 Capstan motor 16 Capstan motor 17 Reel motor 18 Motor control circuit 19 Control circuit 20 Key input terminal 21 Mechanical switch input terminal 22 Magnetic tape

Claims (1)

[Claims] 1. A multi-recorder for recording various sub-codes on one auxiliary track of a plurality of tracks extending in the tape longitudinal direction of a signal recording tape and recording audio signals on the other plurality of audio tracks. In a DCC (Digital Compact Cassette) system equipped with a channel head, an audio signal supplied from the outside is recorded on the A side or B side formed by dividing the tape signal surface into two in the width direction. Yes, the A side and B side of the tape
The time information recorded on the surface is [0: 00: 00: 00]
The magnetic recording / reproducing apparatus is characterized by automatically recording the next marker at the recording end portion of the A side if the next marker is not recorded at the recording end portion of the A side.