JPS63106981A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To hold the continuity of a subcode data on a tape and to improve time accuracy, by storing the subcode data based on a shortening identification signal, comparing it which the subcode data based on a start identification signal, and starting a copy operation from a time when they coincide. CONSTITUTION:When the start identification signal is detected at a system control circuit 12, a mechanism unit 1A stops its operation transiently. Simultaneously, the mechanism unit 1A goes to a reverse reproduction mode, and after a prescribed time, it is changed to a normal direction, and goes to normal reproduction. A memory circuit 13 stores the subcode data at time of completing music at time of the above reverse reproduction, and shifts it to a comparator 14. Also it reads in the subcode data at time of the normal reproduction in the memory circuit 13 by a normal reproduction operation, and inputs it to the comparator 14. When coincidence is obtained between both subcodeds, a compared coincidence output signal is issued, and reproducing recording is restarted.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides a method for adding continuous subcode data during copying when a recorded tape is being reproduced and copied onto another tape. The present invention also relates to a magnetic recording and reproducing apparatus that deletes unnecessary portions such as between songs so that recording can be performed continuously on a tape.

[Technical background of the invention and its problems] Conventionally, there has been a device of this type having the configuration shown in FIG. In the figure, ■ is a first mechanism block that has the function of recording and reproducing digital signals, and ■ is a second mechanism block that has only the function of reproducing digital signals.

1 is a mechanism unit that incorporates a head for recording or reproducing PCM digital signals and drives the running of the tape as a recording medium; 2 is a reproduction unit that amplifies the signal picked up by the head from above the tape; An amplifier, 3 is a PLL circuit that extracts data from the signal passed through the reproduction amplifier 2, 4 is a decoder that performs processing to read the data extracted by the PLL circuit 3, and 5 is a D/A that converts the digital signal into an analog signal. A converter, 6 is a low-pass filter that removes unnecessary high frequency components and extracts the original signal, and 7 is a RAM connected to the decoder 4 that stores digital signals.

8 is a low-pass filter that cants frequencies higher than those included in the original signal; 9 is an A/D converter that converts the input analog signal into a digital signal; and 10 is a device for writing data converted into a digital signal. This is an encoder that performs processing, and is also connected to the RAMT described above. 11 is a recording amplifier that amplifies the signal encoded by the encoder 10 to a signal sufficient for recording; 12 is a mechanism unit 1 (IA); a decoder 4 (4A);
This is a system control circuit that controls the encoder 10 and the like.

In addition, the mechanism unit IA and the reproduction amplifier 2 ASPL in the second mechanism block ■, which has only a reproduction function.
The L circuit 3A, decoder 4A, and RAM 7A are connected to the mechanism unit 1, reproduction amplifier 2, PLL circuit 3, decoder 4, and RAMT shown in the first mechanism block (■) having the above-mentioned recording and reproduction function. be.

In addition, 81 in the figure is a recording/playback switch for selecting the recording or playback mode, S2 is a copy start switch, S3 is a subcode data recording switch, S...
, S, is a copy changeover switch, and S is an output changeover switch.

Next, the copying operation in the apparatus having the above configuration will be explained based on the operation timing diagram shown in FIG. 4.

At the time shown in (4th appearance), copy start switch S2
When turned on, the first mechanism block I is placed in the recording mode and the second mechanism block (2) is placed in the playback mode under the control of the system control circuit 12. At this time, the position of each switch is recording/playback selector switch S.

is switched to the contact side, the copy selector switches 341 and 34□ are switched to the contact side, and the output selector switch SS is switched to the contact side. In addition, the subcode data recording switch S
, is in the on state.

As shown in FIG. 4(a), the tape information played back on the second mechanism block (■) includes a shortening identification signal (Shor) indicating the end of the song as well as music data.
It is assumed that a start identification signal (Start-ID) indicating the starting part of the song is included, and an unnecessary part not directly related to the music is included in the inter-song part. Then, when the playback of the tape information on the second mechanism block ■ side starts, the playback signal from the mechanism unit/ ) 1A is supplied to the PLL circuit 3A via the two playback amplifiers, and P.L.
Data is extracted by the L circuit 3A. The data extracted here undergoes signal processing during playback by the decoder 4A and RAM 7A, and then passes through the contact side of the copy selector switch S4□ interposed in the recording system, and is transferred to the encoder in the first mechanism block ■. IO is supplied.

Then, the encoder 10 and the RAM 7 perform signal processing during recording, and the recording amplifier 11 amplifies the signal to an appropriate level, after which it is supplied to the mechanism unit 1 via the contact side of the recording/playback switch Sl. A built-in head records the data onto the tape.

The monitor during playback of the second mechanism block (2) above supplies the playback output from the decoder 4A to the D/A converter 5 via the contact side of the output selector switch S, where it converts the analog signal into This is done by removing unnecessary high frequency components with a low-pass filter 6, extracting the original signal, and outputting it as a monitor output from an output terminal (OUT PUT).

Now, in the second mechanism block ■, see Figure 4 (
As shown in a), a tape with a shortening identification signal recorded at the end of the song and a start identification signal at the beginning of the song is played back, and this is used as the first mechanism block! Consider the case of copying with .

When the copy start switch S2 mentioned above is turned on,
As shown in recording (1) in FIG. 4(f), the song (1) is copied in the first mechanism block I, and during the copying, as shown in FIG. 3(C), When the above shortening identification signal of song (1) is detected, the mechanism unit IA in the second mechanism block ■
Based on the control from the system control circuit 12, the operation starts from the playback (1) state to the skip state as shown in FIG. 4(e).

Moreover, at the time when this shortening identification signal is detected, the mechanism unit 1 in the first mechanism block ■ shifts from the recording (1) state to the recording mute state as shown in FIG. 4(f). . After a predetermined period of time (T1) has elapsed in this recording mute state, the device waits in a recording pause state.

When the start identification signal of the song (2) shown in FIG. 4 (dl) is detected during the above-described skip operation, the mechanism unit IA in the second mechanism block ), the state enters the playback (2) state from the skip state. Also, from this point on, the mechanism unit 1 in the first mechanism block! starts recording from the recording pause state, as shown in FIG. 4(f). The state shifts to state (2), and copying of surface (2) continues again.

In addition, if the skip operation period of mechanism unit 7 IA in the second mechanism block ■ is shorter than the end of the recording pause state in the mechanism unit 1 in the first mechanism block ■, copying again is necessary. As a start signal, a recording mute end pulse as shown in FIG. 4(g) is generated by the system control circuit 12, and the copying operation is continued by this recording mute end pulse.

Copying is performed as described above, and the recorded state on the tape copied by the first mechanism block I becomes the form shown in FIG. 4(h). In this way, unnecessary portions are deleted during copying, and subcode information such as the program number and absolute time is automatically recorded at the beginning of the recording tape as the copying continues.

However, if the copying operation is continued with the conventional apparatus having the above-mentioned configuration, there is a mechanical rise and fall response time in the mechanism unit 1 of the first mechanism block I, so the recorded absolute time is , there was a problem that the continuity of subcode data such as frame addresses was lost.

Furthermore, at the time when copying is started, a start identification signal, a recording mute end pulse, etc. are used to start the mechanism unit IA of the second mechanism block H, so there may be a shift in the start point each time. There was sex.

[Purpose of the invention]

The present invention was made to eliminate the above-mentioned conventional problems, and by once recording subcode data in memory, the mechanism mode can be electrically converted without changing the operation of the mechanism. It is an object of the present invention to provide a magnetic recording/reproducing device that always maintains continuity of subcode data on a tape.

[Summary of the invention]

The present invention has a first mechanism block having a function of recording and reproducing digital signals, and a second mechanism block having a function of reproducing digital signals, and a shortening identification signal and a start of the song at the end of the song. A tape on which a start identification signal is recorded is played back by the second mechanism block, and is also copied by the first mechanism block, wherein the shortening identification signal is read from the first mechanism block based on the shortening identification signal. The subcode data read from the first mechanism block is temporarily stored in the memory circuit, shifted to the comparison circuit and held there, and the subcode data read from the first mechanism block is transferred again via the memory circuit based on the start identification signal. By inputting the data into a comparison circuit and restarting copying onto the tape from the point at which both of the above subcode data match, unnecessary parts are deleted and the continuity of the subcode data on the tape is maintained. It is.

〔Example〕

Hereinafter, embodiments according to the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a magnetic recording/reproducing apparatus according to the present invention. Parts equivalent to those in the block diagram shown in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

In the configuration of the present invention, the first mechanism block ■
and decoders 4, 4 in the second mechanism block ■
A memory circuit 13 that temporarily stores the subcode data separated at A, and a comparison that compares the subcode data shifted from the memory circuit 13 and already written with the currently read subcode data and outputs a match output. circuit 14
is added.

Next, the operation of the apparatus having the configuration shown in FIG. 1 will be explained with reference to the operation timing diagram shown in FIG. 2. Incidentally, the operation at the time of copying is exactly the same as the conventional case explained based on FIG.

In this case, unnecessary parts of the tape information to be played back on the second mechanism block ■ side are deleted, and copying is continued again while forming a recording mute state on the tape to be copied on the first mechanism block I side. I will explain about it.

As shown in FIG. 2(a), a start identification signal is recorded at the beginning of the song on the tape played back on the second mechanism block (■) side. When detected at the time point shown in FIG. 2 (dl), the mechanism unit IA of the second mechanism block ■ is temporarily stopped as shown in FIG.
IND direction) for as short a time as possible, and waits in a playback pause state. Further, when the start identification signal described above is detected by the system control circuit 12, the mechanism unit 1 of the first mechanism block l is activated as shown in FIG.
As shown in the figure, the vehicle instantly enters the reverse regeneration state, and after traveling in the reverse direction for a certain period of time (T2), the vehicle changes direction to the normal direction and enters the normal regeneration state.

During reverse playback of the first mechanism block I, the memory circuit 13 stores the information recorded by the first mechanism block ■ at the end of the song recorded on the tape being played back on the second mechanism block ■ side. The final subcode data (see FIG. 2(g)) is read from the decoder 4 based on the shortening identification signal and temporarily stored, and this subcode data is shifted to the comparison circuit 14 and held there. Furthermore, when the start identification signal at the start of the song recorded on the tape to be played back is detected in the second mechanism block (2), the start identification signal shown in FIG.
At the timing shown in h), the subcode data recorded on the tape by the normal playback of the first mechanism block I is transferred from the tape in the first mechanism block r via the decoder 4 based on the start identification signal described above. Reading is started to be stored in the memory circuit 13.

The signal read into the above memory circuit 13 is transmitted to the comparison circuit 14.
As described above, the subcode data that has already been read and held based on the shortening identification signal is compared with the subcode data currently read based on the start identification signal. and,
At the time when the comparison of both subcode data in the comparison circuit 14 fails, the comparison shown in FIG.
A dissipated power signal is generated and this comparison-Narita power signal is provided to system control circuit 12. The system control circuit 12 receives the above-mentioned comparison signal from the comparison circuit 14.
Based on the scattered output signal, the second mechanism block ■ is controlled to be in the playback state, and the first mechanism block I is controlled to be in the recording state.
Copying to the mechanism block ■ continues. At the same time, the required absolute time,
Subcode data such as program time and frame address are automatically written onto the tape to be copied by each circuit in the first mechanism based on the subcode write signal shown in Figure 2 01. be able to.

In the operation timing diagram shown in FIG. 2, the skip time in the second mechanism block H is longer than the recording mute time in the first mechanism block ■, but in the opposite case, the same The operation shown in FIG. 2(e) is the same as that described above except that the playback pause period is deleted, and the recording state on the tape recorded by the first mechanism block I is in the form shown in FIG. 2(k). becomes.

In the above embodiment, as shown in FIG. 2(f), when the start identification signal is detected on the second mechanism block ■ side, the first mechanism block ■
The explanation has been given by taking as an example the case where the mechanism unit 1 is put into the reverse play mode and performs reverse play.In this case, the command from the system control circuit 12 is not set to the reverse play mode, but the shortest possible time T2 shown in Fig. 2 is obtained. The mode may also be a REWIND mode.

Further, even if the rewind mode is not set, the reel motor on the supply side may be rotated in the opposite direction in order to create the above-mentioned time Tt.

〔effect〕

As explained above, according to the present invention, the memory circuit temporarily stores subcode data, and the subcode data read from the first mechanism block on the copying side based on the shortening identification signal and the start identification signal. The present invention is configured to include a comparison circuit that compares the subcode data currently read from the first mechanism block and supplies a comparison and scattered output signal to the system control circuit when both of them are defeated. , 2. Even if the operation mode of the mechanism in the first mechanism block is changed when unnecessary portions are deleted, the continuity of the subcode data on the tape can always be maintained while being recorded. That is, since the continuity of the absolute time, frame address, etc. included in the subcode data is maintained, highly accurate time information with little error can be obtained.

In addition, wasted space recorded on the tape is eliminated, and the continuity of the music data is improved even when recording is stopped midway and then started again. .

In particular, when the content recorded on the tape on the playback side during copying is recorded while an FM broadcast is being aired, this is effective for automatically editing the content. Don't waste the tape on the copying side (
, and can record with high time accuracy.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is an operation timing diagram for explaining the operation of an embodiment of the present invention, and FIG. 3 is a conventional magnetic recording/reproducing apparatus. FIG. 4 is a configuration diagram showing the device, and is an operation timing chart for explaining the operation of the conventional device. ■...First mechanism block, ■...Second mechanism block, 13...Memory circuit, 14...
Comparison circuit.

Claims (1)

[Claims] A first mechanism block having a function of recording and reproducing digital signals, and a second mechanism block having a function of reproducing digital signals, and a shortening identification signal and a shortening identification signal of the song at the end of the song. In a magnetic recording and reproducing device, a tape having a start identification signal recorded in a start portion thereof is reproduced by the second mechanism block, and is also copied by the first mechanism block, wherein the first mechanism block a memory circuit for temporarily storing the subcode data recorded on the tape to be copied by; the subcode data already read from the first mechanism block based on the shortening identification signal; and the subcode data already read from the first mechanism block based on the start identification signal. and a comparison circuit that compares the subcode data currently read from the first mechanism block and outputs a comparison match output signal when the two match, and uses both of the identification signals to identify unnecessary parts other than the song. What is claimed is: 1. A magnetic recording and reproducing device characterized in that it is capable of copying while deleting subcode data while maintaining the continuity of subcode data on a tape.