JPH04129082A - Postrecording device for dat - Google Patents

Abstract

PURPOSE:To considerably reduce the number of frames having only subcode areas by discriminating the presence or the absence of an RF signal on a tape based on the RF signal obtained by a mask means. CONSTITUTION:A mask part 10 receives a signal RFEN from a RF detecting part 8 and a signal RFIN from a timing generating part 9 to generate a signal indicating the section, where the essential RF signal having no influence exists, as an output signal RFENV'. The signal RFENV' is inputted to an RF discriminating circuit 11 to generate a signal RFDT indicating the presence or the absence of the RF signal for every one rotation of a drum, and this generated signal is supplied to a microcomputer 12. The microcomputer 12 discriminates whether the postrecording operation should be stopped or not based on this signal RFDT and controls each part of a DAT system in accordance with the discrimination result. Thus, the maximum number of frames having only subcode areas which cause various troubles is reduced to one.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a DAT dubbing device, and more particularly to a DAT dubbing device that solves operational problems caused by recording only in the subcode area during dubbing. .

(Conventional technology) Audio signals are digitally recorded on tape, and when played back,
After reading out this digital signal, it is converted to an analog signal and output as a playback audio signal.
audio tape recorders) have extremely little deterioration in sound quality.

In this DAT device, the signals recorded on the DAT tape track are recorded in various areas divided on the track. Normally, the signal is recorded in various areas divided on the track. Normally, the signal is recorded in the margin area, sub area 1, ATF area 1, and main area. area, ATF area 2, sub area 2, marginal area 2
Each signal is recorded in eight areas. 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 contain subcode signals such as time, address,
Song number, start ID (S-ID), skip ID
(SK-ID) - End ■D (END-ID), etc. are written, and information for main signal reproduction, high-speed search, etc. is written.

In conventional DAT dubbing equipment, after writing the data signal as a PCM signal on the DAT tape, a new 5-ID is written in the subcode area.

An after-recording operation is performed in which data such as 5K-ID and END-ID is written or erased by overwriting.

(Problems to be Solved by the Invention) As described above, in the conventional DAT dubbing apparatus, writing of subcode information is overwritten only in the subcode area.

By the way, the RF multiplied signal reproduced by the rotating magnetic head contains noise generated during recording/reproduction switching, leakage of recording subcode signals, etc., and even when the original RF multiplied signal is not recorded on the tape. A regenerative RF signal may be output as if it were present.

Therefore, in such a case, the after-recording operation will be performed only in the subcode area where the original RF multiplied signal is not recorded. In particular, near the end of the recording section of the tape, if dubbing is performed in an area where the main signal is not recorded, there is a risk of a maximum of 9 seconds (300 frames) of a portion on the tape where only the subcode area is recorded. .

Frames containing only this subcode area not only have the problem of not following the regular DAT format, but as a result, various problems may occur during tape playback (e.g., search errors, shock noise generation, splicing errors, etc.). ).

SUMMARY OF THE INVENTION An object of the present invention is to provide a DAT post-recording apparatus that solves the above-mentioned problems and can reduce the number of frames in which only the subcode area, which causes various troubles, to one frame at most.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the DAT dubbing apparatus according to the present invention uses an RF multiplied signal obtained from a rotating magnetic head based on a signal indicating the existence section of the subcode area to be dubbed. a masking means for masking and removing a signal in an area indicating an existing section of the sub-code area; and determining the presence or absence of an RF-multiplied signal recorded on the tape based on the RF-multiplied signal obtained by the masking means. R to do
F determination means;

(Function) In this invention, the tape is recorded on the basis of the RF multiplied signal obtained by masking and removing the signal in the area indicating the existing section of the subcode area to be dubbed, including the RF multiplied signal obtained from the rotating magnetic head. By determining the presence or absence of the RF multiplied signal, the number of frames in which only the subcode region exists is significantly reduced.

(Example) Next, the present invention will be explained with reference to the drawings.

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

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

The RF detection section 8 determines that the RF multiplied signal is present when the RF multiplied signal level exceeds a certain value, and sends the envelope signal to the mask section 10 as RFENV.

The timing generator 9 generates a drum FG by rotating a drum motor 7 equipped with rotating magnetic heads 2A and 2B.
The magnetic head 2 is operated based on the DFG signal and DPG signal generated from the sensor 5 and the drum PG sensor 6, respectively.
It generates signals necessary for each part, such as a switching signal swp for switching between A and 2B, and an RFINH signal to be described later.

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

The mask section 10 performs gate processing based on the RFEN■ signal from the RF detection section 8 and the RFINH signal from the timing generation section 9, and generates an RFENV' signal to be described later.

The RF determining section 11 determines the presence or absence of an RF signal for each rotation of the drum based on this RFENv' signal, and outputs an RFDT signal indicating the determination result to the microcomputer 12.

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

Head switching signal SW output from timing generator 9
The magnetic heads 2A and 2B are sequentially switched as A head and B head respectively by P, and there are subcode areas 5ubl before and after the main area where the RF part signal obtained through each magnetic head and the PCM signal are written as shown in the figure.
and 5ub2 are included.

From the signal processing unit 4, during the dubbing operation, a subcode signal RDATA to be dubbed and a signal RECPB for switching recording/playback in this dubbing section are sent to the RF amplifier 3.
Output via .

The RF amplifier 3 also amplifies and outputs reproduction signals from the rotating magnetic heads 2A and 2B.

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

The mask section 10 receives the above-mentioned RFEN signal from the RF detection section 8 and the RFINH signal from the timing generation section 9, and indicates as an output signal (RFENV') a section where the original RF section signal without the above-mentioned influence exists. Generate a signal.

The RFENV' signal is the RF judgment time N! 11 is entered,
An RFDT signal indicating the presence or absence of an RF signal for each rotation of the drum is generated and supplied to the microcomputer 12.

The microcomputer 12 determines whether or not to stop the dubbing operation based on this RFDT signal, and controls each part of the DAT system according to the determination result.

In the above embodiment, the RFENV signal is masked by the RECPB signal indicating the section in which the dubbing operation is performed, but the AT signal used in the DAT system indicates whether or not the ATF is locked during playback.
It is clear that the FLOCK signal may also be added to the conditions for stopping the post-recording operation.

(Effects of the Invention) As explained above, the DAT dubbing apparatus according to the present invention removes the part corresponding to the subcode area to be dubbed from the signal obtained from the rotating magnetic head, and only reproduces the reproduced RF signal originally recorded on the tape. Since the presence or absence of the RF section signal is determined based on this and the dubbing operation is performed, the subcode area is not recorded independently beyond the end of the recording section of the tape during the dubbing operation as in the conventional case. the result,
Dubbing in accordance with the DAT format is now possible, and D
Malfunctions such as AT search errors and shock noise generation can be prevented.

[Brief explanation of the drawing]

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

Claims (1)

[Claims] From an RF signal obtained from a rotating magnetic head based on a signal indicating the existing section of a subcode area to be dubbed,
a masking means for masking and removing a signal in an area indicating an existing section of the sub-code area; and an R for determining the presence or absence of an RF signal recorded on the tape based on the RF signal obtained by the masking means.
A DAT dubbing apparatus comprising: an F determination means; and a DAT dubbing apparatus.