JPH0648617Y2 - Information recording / reproducing device - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an R-DAT (rotary head type digital audio tape recorder), an 8 mm video tape recorder,
The present invention relates to an information recording / reproducing apparatus such as a compact disc player, and more particularly to an information recording / reproducing apparatus that ensures a precise cueing / reproducing operation during a search.

[Technical background of the device and its problems]

For example, in R-DAT and the like, in addition to the original PCM audio signal, subcode information as search information such as a program is recorded on a magnetic tape as a magnetic recording medium by dividing the area on each track. By reading the above sub-code information in the search state during high-speed running, quick cueing or the like is performed.

The start identification signal (ST-ID) that is recorded as sub-code information for the above cueing is a cueing signal.
The start identification signal plays the role of a marking signal when searching a specific position on the magnetic tape. In many cases, the start identification signal is recorded at a leading portion of each music for a certain period of time to perform a music selection reproduction operation or the like. Used.

Conventionally, when the above-described start identification signal is automatically recorded when continuously recording a series of music pieces on a magnetic tape, the start time of the music piece is detected while recording the music piece, and this detection is performed. At the same time, the start identification signal was being recorded.

As described above, in the magnetic tape in which the start identification signal is automatically recorded together with the recording of the song, since the start point of the song and the rising point of the start identification signal are recorded at the same time, the music selection / playback operation in the search state In this case, music is started to be reproduced from the rising edge of the start identification signal, but at this time, muting is performed for a certain period of time in order to prevent noise generated due to unstable elements of the mechanism system. Therefore, there was a problem that the beginning of the song was missing and played back.

Further, if the magnetic tape is rewound by a predetermined amount after the rising edge of the start identification signal is detected in consideration of the above-mentioned muting time and then the reproduction is performed, the reproduction is started from the last portion of the previous music. However, there is a problem that it is very difficult to perform precise cue reproduction.

[Purpose of device]

The present invention has been made in order to eliminate the above-mentioned conventional problems. During high-speed search and reproduction, the normal reproduction operation is performed by detecting the rising time point of the cueing signal and the program information is recorded as described above. It is an object of the present invention to provide an information recording / reproducing apparatus capable of performing accurate precise cue reproduction by performing reproduction with a delay of a certain time from the rising time point of a cue signal.

[Outline of device]

The present invention relates to an information recording / reproducing apparatus which records and reproduces a plurality of partitioned program information on a magnetic recording medium and a cue signal indicating the beginning of each of the program information. It is configured such that each program information is played back with a delay of a certain time with respect to the above-mentioned cueing signal, and during the music selection playback operation, the normal playback operation is started from the rising time point of the above-mentioned cueing signal, and It is designed so that it can be played back at the beginning.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a reproducing system showing an embodiment of an information recording / reproducing apparatus according to the present invention, which is an example when applied to an R-DAT.

In the figure, 1 is a mechanism for driving the running of the magnetic tape, 2 is a mechanism control unit for controlling the operation of the mechanism 1, 3 is a rotary head for picking up a signal recorded on the magnetic tape, and 4 is a pickup by the rotary head 3. A reproduction amplifier 5 for reproducing the generated signal is an 8-10 demodulation circuit that converts a data string and restores it.

6 is an error detection / correction circuit for detecting and correcting an error in the demodulation data output from the 8-10 demodulation circuit 5, and 7 is demodulation data subjected to error correction by the error detection / correction circuit 6 for a predetermined time. A delay circuit 8 for delaying is a D / A conversion circuit for converting the delayed digital signal into an analog signal.

Reference numeral 9 is a sub-code decoder for extracting only sub-code data from the data demodulated by the demodulator circuit 8-10, and reference numeral 10 is an instruction from the operation unit 12 composed of a switch or the like and sub-sub-code supplied from the sub-code decoder 9. It is a control circuit that sends a command for controlling the mechanism 1 to the mechanism control unit 2 based on the code information, or sets the muting timing in the mute circuit 11. The mute circuit 11 controls the muting state of the output of the D / A conversion circuit 8 based on the control command from the control circuit 10.

Next, the operation of the reproduction system having the above configuration will be described.

Now, in the magnetic tape in which a start identification signal (ST-ID) as sub-code information as a cue signal of the music is recorded at the same time as the rising of the music in the mode shown in FIG. The operation when performing music selection reproduction based on a search will be described.

First, when an operation to start the search operation is performed on the operation unit 12, a search operation start command is supplied from the operation unit 12 to the control circuit 10, and the mechanism control unit 2 is searched via the control circuit 10. A command is sent to start the operation.

Then, the mechanism control unit 2 sets the mechanism 1 in the FF direction or the RE direction based on the search direction instructed by the operation unit 12.
The magnetic tape is driven to run by controlling the running direction in the W direction. During this high-speed search operation in the FF or REW direction, the rotary head 3 reads the signal recorded on the magnetic tape and supplies this signal to the reproduction amplifier 4. The output signal from the reproduction amplifier 4 is demodulated in the 8-10 demodulation circuit 5, only the subcode information is extracted and read from the demodulated output by the subcode decoder 9, and recorded here as a cue signal. When the start identification signal is detected, a detection output indicating that the start identification signal is detected is supplied to the control circuit 10.

Based on the detection output of the start identification signal from the subcode decoder 9, the control circuit 10 causes a series of instruction loops similar to those described above (control circuit 10 → mechanism controller 2 → mechanism 1 → rotary head 3 → reproducing amplifier 4 → 8-10 Demodulation circuit 5 →
After the sub-code decoder 9 → control circuit 10), the magnetic tape is moved forward and backward at a medium speed, and the start identification signal is precisely cued in order to correct the overrun due to the high speed running until then. , The control operation is performed so that the search operation is completed and the mechanism 1 is brought into the normal reproduction state.

During the above-mentioned music selection playback, the operation state of the mechanism from detecting the start identification signal from the search state to shifting to the normal playback state is divided into the FF direction search and the REW direction search. It is shown in FIG.

FIG. 3A shows a recording mode of a music piece (program) and a start identification signal (cueing signal) on the magnetic tape. In the case of a search in the FF direction, as shown in FIG. 3 (b), first, a high-speed search operation in the FF direction is started, and from the time when the start identification signal is detected during this high-speed search, a time T _{1 is} overrun. Stop after driving. Then, initiated is the medium speed search REW direction at a medium speed, the start identification signal in the medium speed search time is stopped and overrun by the time T ₂ from the detection again, more time T ₂ by muting A normal reproducing operation is performed in the applied state, the muting is canceled at the rising edge of the start identification signal, and the reproducing operation of the music (program) is performed at the same time as the rising edge of the start identification signal. .

Further, in the case of the search in the REW direction, as shown in FIG. 3 (c), the high-speed search operation in the REW direction is first started, and the time after the start identification signal is detected during this high-speed search.
It will stop until it has run over T ₃ and then stops. Then, the middle speed search in the FF direction at the middle speed is started, and after the start identification signal is detected during this middle speed search, it overruns for a time T ₄ and then stops, and this time in the REW direction at the middle speed. The search is performed and the start identification signal is detected, and the operation is overrun for a time T ₅ and then stopped. Then, the normal reproducing operation is performed in the muted state for the time T ₅ , the muting is released at the rising edge of the start identification signal, and the music is reproduced at the same time as the rising edge of the start identification signal. The playback operation is performed.

As described above, the control circuit 10 causes the mute circuit 11 to control the D /
Muting is applied to the output of the A conversion circuit 8, and the muting is released when the rising edge of the start identification signal is detected.

On the other hand, the demodulated output demodulated by the 8-10 demodulation circuit 5 is error-corrected by the error detection / correction circuit 6, and then delayed by the delay circuit 7 for a certain period of time. And is taken out as a reproduction output from the output terminal Tout.

FIG. 4 shows the relationship between the start identification signal, the output signal, and the muting operation. Muting is released as shown in FIG. 4 (c) at the rising edge of the start identification signal shown in FIG. 4 (a) at the stage when the search operation is completed and the reproduction operation of the target music is started. Then, as shown in FIG. 4 (b), the output signal appears with a delay of a certain time from the rising of the start identification signal, and the music is reproduced.

That is, as described above, the reproduction state is entered after the search operation is completed, the muting is released when the rising edge of the start identification signal is detected, and the reproduction signal is output to the output terminal Tout. In this case, the timing for releasing the muting does not have to be the time when the rising edge of the start identification signal is detected, and there is a margin in the timing for releasing the muting by the time delay of the rising edge of the music relative to the rising edge of the start identification signal. I have.

〔effect〕

According to the present invention described above, the information recording is such that a plurality of partitioned program information and a cue signal indicating the head portion of each of the program information are recorded and reproduced on the magnetic recording medium. In the reproducing apparatus, since each program information is delayed with respect to the above-mentioned cueing signal at the time of reproduction and reproduced, a cueing signal is detected by a high-speed search during a music selection reproducing operation. Even if the playback operation is started from the rising edge of the signal, there is a certain time delay until the start point of the song, so the timing of muting cancellation can be taken clearly.
It is possible to prevent the inconvenience that the beginning portion of the music piece is lost due to the variation in overrun during the search, or the beginning portion of the previous music piece is reproduced, and it is possible to perform precise cue reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram showing a reproducing system when the present invention is applied to an R-DAT, and FIG. 2 is a conceptual diagram showing a recording mode on a magnetic tape on which a general start identification signal is recorded. FIG. 4 is a diagram showing the outline of the operation of the mechanism at the time of high-speed search of the start identification signal, and FIG. 4 is a diagram showing the relationship between the start identification signal, the output signal and the muting operation. 7 ... Delay circuit, 9 ... Subcode decoder.

Claims (1)

[Scope of utility model registration request] 1. A plurality of partitioned program information and a cueing signal as subcode information indicating the beginning of each of the program information are recorded and reproduced on a magnetic recording medium. In the information recording / reproducing apparatus, a reproduction system including a sub-code decoder for extracting the cue signal from the demodulated signal and a delay circuit for delaying each of the demodulated program information by a predetermined time from the rising time of the cue signal. In preparation for playback, each program information is played back with a delay of a certain time with respect to the cue signal at the time of playback, and the playback operation of each program information is started from the rising time of the cue signal at the time of selecting and playing a music piece. An information recording / reproducing apparatus characterized in that the information is reproduced.