JPH0233754A - Digital audio tape recorder - Google Patents

Abstract

PURPOSE:To promote the operability at the time of editing a magnetic tape by retrieving an end part on the leading side of an end ID with an input of a prescribed command signal and rewriting afterward a recording area of the end ID in traveling the tape in the forward direction. CONSTITUTION:For instance, when the instruction to retrieve the end ID is inputted to a control part 8, a servo circuit part 7 and a signal processing part 5 are controlled by the control part 8 to carry out a high speed search, and a signal regenerated by magnetic heads 3a and 3b is amplified by a recording/regenerating amplifier 4, and then the end ID is detected by the signal processing part 5. Then, when the end ID is detected, a mechanism part 1 is stopped by the control part 8 so as to position the magnetic heads 3a and 3b relative to the magnetic tape into a head part of the end ID, thus completing the retrieval of the end ID. Afterward, the recording area of the end ID is rewritten by traveling the magnetic tape in the forward direction. By this method, the operability for the tape edit, etc., can be promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a digital audio tape recorder, and relates to an improvement in the after-recording function for subcode areas.

[Technical background of the invention and its problems]

A digital audio tape recorder is a device that records audio signals such as music as digital data converted into PCM signals on a magnetic tape, reads out the recorded data, demodulates it, and reproduces the audio signal.

FIG. 4 is a diagram (not showing a magnetic tape recording device) used in a digital audio tape recorder called R-DAT using a helical scan type rotary head.

As shown in the figure, the data recording area of one track is
PCM that mainly contains PCM data of audio signals
and two subfield areas (SUB), 5UB2) provided before and after the PCM area, sandwiching the A] and F areas for automatic trunking control.

In the P CM 9J area, data such as l) CM audio signal is recorded, and it also indicates the sampling frequency, whether copying is possible, etc. '1' I) CM
- ID and an optional ':1 code indicating a time information piece are recorded. In addition, each subcode area of 5UL (1, 5UB2) contains subcode data such as time information similar to the I) CM area, as well as a star 1-ID indicating the beginning of the program and a programmer to identify the program. J, number (PNo-ID), and other subcode IDs are recorded.

Each track is recorded diagonally on the magnetic tape, with the central part of the magnetic tape serving as a PCM area and the sides thereof serving as sub code areas.

The subcode area and the PCM area each have a synchronization signal area formed therein so that they can be recorded independently. For example, operations such as recording the subcode area while reproducing the PCM area can be performed.

Data such as star 1-ID and program number recorded in the above subcode area are searched when locating the beginning of a program, etc., and these data can be rewritten by after-recording in the subcode area. It has become.

By the way, →”゛decode? The recording area for recording the above program number in the +M area does not indicate the end position of all programs, but is also used as a recording area for EnI''lD, and the part after the last program (part of read error).
For example, predetermined data (OEE) is recorded for a certain period as an end ID.

However, if you change the end ID in the middle of the program, etc.
If you record R, if you play it back as it is, the device will play 5TO at the incorrectly recorded end ID position.
The program enters the P state, and it is no longer possible to continue playing the recorded program.

In conventional digital audio cheap recorders, in order to erase an end ID, a program must be recorded from the position of that end ID, and the I
) Don't rewrite the CM area, just enter it)
Noko can't be white.

Therefore, there was a problem in terms of operability when editing the tape.

[Object of the invention] The present invention improves the after-recording function for the ZABCO F"6M range in a digital audio recorder, and improves operability by making it possible to erase only the end ID. I'm going to do it.

[Summary of the Invention] The present invention is designed to erase the end ID by rewriting only the subcoat area by running the magnetic tape in the forward direction after searching for the end ID in after-recording of the subcoat ID of a digital audio cheap recorder. I made it.

〔Example〕

FIG. 1 is a block diagram showing a digital audio cheap recorder according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a mechanical unit that runs the magnetic tape in a set operating mode, and is a magnetic tape 3a.

By rotating the rotary tram 2 with 3b removed, a magnetic tape (not shown) is played back and recorded.

The recording/reproducing amplifier 4 amplifies the reproduction signal read by the magnetic heads 3a, 3b, and also amplifies the recording signal and supplies it to the magnetic heads 3a, 3b.

The signal processing unit 5 performs decoding or encoding of the audio data and ID data, such as 8-1.0 conversion, and converts the reproduced signal into digital audio data.
1) Obtain the data and generate a recording flash at the time of recording,
Generates timing pulses necessary for data processing and servo control.

The audio section 6 converts the input analog audio signal into digital data using an A/D converter, and converts the digital audio signal into an analog audio signal using a D/A converter.

The servo circuit section 7 stably drives the mechanical section 1 and the rotary tonneau 2 in response to a reproduction signal from the recording/reproduction amplifier 4, a pulse signal from the signal processing section 5, and the like.

The control means 8 is composed of a microphone 10, a computer, etc., and sets the mote of the mechanical section 1 in response to a signal inputted from the operation means 9 such as an operation switch, and also controls the input mode as described later. Controls after-recording of subcode area including erasure.

FIG. 3 is a flowchart relating to the embodiment, and FIG. 2 is a diagram showing changes in the relative position of the magnetic head with respect to the magnetic tape and the operation during operation of the embodiment.

After-recording of the subcode area is performed after first searching for the specified ID.

In other words, when the after recording mode F and its target ID are specified, the specified ID such as the start ID and end stream is searched, and the ID is put into a standby state.
When a signal instructing deletion is input manually, after-recording is performed according to the searched ID.

For example, when an instruction to search for the end river is input to the control unit 8, the control unit 8 controls the servo circuit unit 7 and the signal processing unit 5 to perform a high-speed search, and at this time, the magnetic heads 3a, 3
The signal reproduced by b is amplified by the recording/reproducing amplifier 4,
The signal processing unit 5 detects the end of the river. and,
When the end ID is detected, the control unit 8 stops the mechanical unit 1 so that the position of the magnetic heads 3a and 3b relative to the magnetic tape is at the head of the end ID (tape top side).
The search for End River is completed (Fig. 2(b)).

When a signal instructing ID deletion is input from the operating means 9, it is determined whether or not the current end ID has been searched, and if it is not after the end ID search, the designated ID is deleted.

At this time, when searching for the start ID, etc., it does not stop at the beginning of the ID flow, so perform the REVIEW operation to accurately find and stop the beginning of the ID flow, and set the mechanical section 1 to PB operation mode. The PCM 8M area is played back, and the subcode area is recorded (FIG. 2(a)).

On the other hand, if the end ID has been searched, the control section 8 causes the servo circuit section 7 to perform the normal PB operation to run the magnetic tape in the forward direction, and at the same time controls the signal processing section 5 to control the subcode area. In addition to recording the specified signal,
For the M area, the recorded signal is reproduced (second
Figure (b)).

As described above, after-recording is performed only on the part where the end of the subcode area is recorded, and erasing of the encoder ID is completed.

(Effects of the Invention) As explained above, according to the digital audio chip recorder of the present invention, in after-recording of sub code ID, after searching for the end ID, the magnetic tape is run in the forward direction and only the sub code area is rewritten. This makes it possible to erase only the end of the tape, improving operability when editing tapes, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a digital audio tape recorder according to an embodiment of the present invention. FIG. 2 is a diagram showing changes in the relative position and operation of the magnetic head with respect to the magnetic tape in the embodiment. FIG. 3 is a flowchart related to the embodiment. , 4th M is a diagram showing a recording pattern of a magnetic tape in R-DAT according to the present invention. 1... Mechanical part, 2... Rotating drum, 3a, 3b...
- Magnetic head, 4... Recording/playback amplifier, 6... Audio section, ■... Servo circuit section, 9... Control means, 9... Operating means. ■

Claims (1)

[Scope of Claims] A digital audio tape recorder that records an information program and ID information of the information program on a magnetic tape in a predetermined format, and plays back the information program and ID information from the magnetic tape, comprising: Rewriting means for recording a preset signal in the ID information recording area at the same time as the program recording area is reproduced; end ID detecting means for detecting an end ID from the reproduced ID information; and a mode to be set. tape driving means for running the magnetic tape in a forward direction, running in a reverse direction, and stopping the magnetic tape in accordance with the above; and a control means for setting a mode of the tape driving means and controlling the rewriting means; reproduces the magnetic tape by inputting a predetermined command signal and searches for the leading end of the end ID based on the detection signal of the end ID detection means;
Thereafter, the digital audio tape recorder is characterized in that the magnetic tape is run in the forward direction and the rewriting means is activated to rewrite the end ID recording area.