JP2673038B2 - DAT post-recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DAT dubbing device, and more particularly to a DAT dubbing device that solves an operational problem caused by recording only in a subcode area during dubbing.

(Prior Art) A DAT (digital signal) that digitally records an audio signal on a tape and, at the time of reproduction, reads this digital signal, converts it to an analog signal, and outputs it as a reproduced audio signal.
Audio tape recorders) have very little deterioration in sound quality.

In this DAT device, signals recorded on the DAT tape track are recorded in various areas divided on the track. Normally, each signal is recorded in eight areas, which are a margin area, a sub area 1, a ATF area 1, a main area, an ATF area 2, a sub area 2, and a marginal area 2. The marginal area is an area for obtaining stable contact between the tape and the head, and the ATF signal recorded in the ATF area is used for servo control. Subareas (subcode areas) 1 and 2 are subcode signals, such as time, address, song number, start ID
(S-ID), skip ID (SK-ID), end ID (END-I)
D) and the like are written, and information for reproduction of the main signal and high-speed search is written.

In a conventional DAT post-recording device, after writing a data signal as a PCM signal on a DAT tape, new data such as S-ID, SK-ID, and END-ID is written or erased in the subcode area by overwriting. After-recording operation is performed.

(Problems to be Solved by the Invention) As described above, in the conventional DAT post-recording device, the subcode information is written only in the subcode area.

By the way, the RF signal reproduced by the rotary magnetic head contains noise generated during recording / reproduction switching, leakage of the recording subcode signal, etc. Even if the original RF signal is not recorded on the tape. The output RF signal may be output as if present.

Therefore, in such a case, the post-recording operation is performed only in the subcode area where the original RF signal is not recorded. In particular, in the vicinity of the end of the recording portion of the tape, when the after-recording operation is performed in the area where the main signal is not recorded, the portion recorded in only the subcode area on the tape may be up to 9 seconds (300 frames). is there.

Not only is there a problem that a frame with only this subcode area does not follow the DAT's regular format, but as a result, various troubles during tape playback (for example, search mistakes, shock noises, splice recording errors, etc.) Etc.) will occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a DAT dubbing device that solves the above-mentioned problems and can make a maximum of one frame in which only a subcode area that causes various troubles exists.

(Means for Solving the Problems) In order to solve the above problems, the DAT dubbing apparatus according to the present invention is based on an RF signal obtained from a rotary magnetic head based on a signal indicating the existence section of a subcode area to be dubbed. Masking means for masking and removing the signal of the area indicating the existing section of the sub-code area, and determining the presence or absence of the RF signal recorded on the tape based on the RF signal obtained by the masking means. It is configured by including an RF judgment means.

(Operation) In the present invention, the RF signal recorded on the tape based on the RF signal obtained by masking and removing the signal of the area indicating the existence section of the subcode area to be post-recorded from the RF signal obtained from the rotary magnetic head By determining the presence or absence of the frame, the number of frames in which only the subcode region exists is greatly reduced.

(Embodiment) Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of a DAT dubbing device according to the present invention.

The signals recorded on the magnetic tape 1 are read and reproduced by the rotary magnetic heads 2A and 2B which have opposite azimuth angles and are rotated by the drum motor 7. This reproduction signal is amplified by the RF amplifier 3 and then sent as an RF signal to the signal processing unit 4 and the RF detection unit 8.

The RF detection unit 8 determines that the RF signal is present when the level of the RF signal becomes a certain value or more, and detects the envelope signal RFENV.
Is sent to the mask unit 10.

The timing generator 9 is a DF generated by the drum FG sensor 5 and the drum PG sensor 6, respectively, by the rotation of the drum motor 7 equipped with the rotary magnetic heads 2A and 2B.
Necessary signals are generated in each part, such as a switching signal SWP for switching the magnetic heads 2A and 2B based on the G signal and the DPG signal, and an RFINH signal described later.

The signal processing unit 4 is controlled by the microcomputer 12 and receives the RECPB signal for instructing recording / reproduction based on the head switching signal SWP from the timing generating unit 9 and the RF signal from the RF amplifier 3 and RDATA which is a signal to be written. The signal is supplied to the RF amplifier 3.

The mask unit 10 performs gate processing based on the RFENV signal from the RF detection unit 8 and the RFINH signal from the timing generation unit 9 to generate an RFENV ′ signal described later.

The RF determination unit 11 determines the drum 1 based on the RFENV ′ signal.
RFDT showing the judgment result by judging the existence of RF signal for each rotation
The signal is output to the microcomputer 12.

FIG. 2 is a timing chart of signals of respective parts for explaining the operation of the embodiment circuit shown in FIG.

Head switching signal SW output from the timing generator 9
The magnetic heads 2A and 2B are sequentially switched by the P as the A head and the B head, respectively, and the RF signal obtained through each magnetic head is divided into subcode areas Sub1 before and after the main area in which the PCM signal is written as shown in the figure. Sub2 is included.

During the post-recording operation, the signal processing unit 4 outputs the sub-code signal RDATA to be post-recorded and the signal RECPB for switching recording / playback in the post-recording section via the RF amplifier 3. The RF amplifier 3 also includes rotating magnetic heads 2A and 2B.
The reproduced signal from is amplified and output.

This RF signal is input to the RF detection unit 8 and, as described above,
The RFENV signal indicating the section where the RF signal exists is output.

The mask unit 10 receives the RFEN signal from the RF detection unit 8 and the RFINH signal from the timing generation unit 9, and indicates a section in which an original RF signal having no influence as described above exists as an output signal (RFENV ′). Generate a signal.

The RFENV ′ signal is input to the RF judgment circuit 11 and the drum 1
An RFDT signal indicating the presence or absence of an RF signal for each rotation is generated and supplied to the microcomputer 12.

The microcomputer 12 determines whether to stop the after-recording operation based on the RFDT signal, and controls each unit of the DAT system according to the determination result.

In the above embodiments, the RFENV signal is masked by the RECPB signal indicating the period in which the after-recording operation is performed, but the ATFLOCK signal indicating whether the ATF is locked at the time of reproduction used in the DAT system. It is obvious that the signal may be added to the post-recording stop condition.

(Effects of the Invention) As described above, the dubbing device for a DAT according to the present invention removes the subcode area corresponding part to be dubbed from the signal obtained from the rotary magnetic head, and only reproduces the RF signal originally recorded on the tape. Since the presence or absence of the RF signal is determined based on the post-recording operation, the sub-code area is not recorded alone during the post-recording operation beyond the end of the recording portion of the tape as in the conventional case. As a result, DAT
After-recording according to the format is possible, and erroneous operations such as DAT search mistakes and shock noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a DAT post-recording device according to the present invention, and FIG. 2 is a timing chart of signals of respective parts for explaining the operation of the embodiment shown in FIG. 1 ... Magnetic tape, 2A, 2B ... Magnetic head, 3 ... RF amplifier, 4 ... Signal processing unit, 5 ... Drum FG sensor, 6 ... Drum PG sensor, 7 ... Drum motor, 8 ... RF detection section, 9 ... Timing generation section, 10 ... Mask section, 11 ... RF determination section, 12 ... Microcomputer.

Claims (1)

(57) [Claims] 1. Masking means for masking and removing, from an RF signal obtained from a rotary magnetic head, a signal in a region indicating a subcode region existing region on the basis of a signal indicating a subcode region existing region to be post-recorded. And a RF decision unit for deciding the presence or absence of the RF signal recorded on the tape based on the RF signal obtained by the masking unit.