JPS61237204A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To speed up and facilitate the recording and retrieval of information by providing a subordinate area lengthwise to a tape separately from respective recording areas and extracting information in the subordinate area with a clock signal generated on the basis of the conveying operation of a tape conveying means. CONSTITUTION:A clock signal corresponding to the rotating speed of a capstan motor 53 is generated by a bit clock generation part 55 for data transfer in a recording state wherein a switch 67 is connected to a contact A. This clock signal and data to which a synchronizing signal is added by a synchronizing signal adding part 64 are synchronized with each other by a data transfer synchronization part 63, passed through a recording amplifier 62, and recorded on a track 14 on the tape by a fixed head part 51. Then, the switch 67 is connected to a contact B in a playback state. A clock signal generated by a bit clock generation part 57 for data extraction and a synchronizing signal detected by a comparator 59 are coincident with each other irrelevantly to a tape speed, so the clock signal for data extraction and data are superposed by a synchronizing signal detection part 60 and the data is extracted by a data extraction part 61 and supplied to a system control part 65.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention divides the tape into a plurality of regions in the tape width direction while transporting the tape in the longitudinal direction using a transport means, and This invention relates to a recording and reproducing apparatus that sequentially forms tracks at different angles and records and reproduces signals.

[Conventional technology]

In recent years, high-density recording has been pursued in the field of magnetic recording, and even in video tape recorders (hereinafter referred to as VTRs), the running speed of the tape has been lowered to perform even higher-density magnetic recording. For this reason, if audio signals are recorded using a fixed head as in the past, the relative speed cannot be maintained high and the reproduced sound quality deteriorates. As a solution to this problem, a method has been considered in which the length of the track formed by the rotary head is made longer than before, and audio signals compressed in the time axis are sequentially recorded on the extended portion.

FIG. 6 is a diagram showing a conventional tape running system of such a VTR, and FIG. 7 is a diagram showing a recording locus on a magnetic tape by the VTR shown in FIG. In the figure, 1 is a magnetic tape (hereinafter referred to as tape), 2 is a rotating cylinder, 3, 4
are magnetic heads (hereinafter referred to as heads) having mutually different azimuth angles that are attached to this cylinder 2 with a phase difference of 180°, 5 is a video area portion of the track formed on the tape 1, and 6 is also an audio area portion. It is.

The video area 5 is a portion where heads 3 and 4 traced the tape at 1800 minutes of rotary cylinder 2, and the audio area 6 is a portion where heads 3 and 4 traced the tape at 00 minutes of rotary cylinder 2.

The sound quality when playing back the audio signal which has been converted into PCM and time axis compressed in the audio area in this way is quite high and is comparable to the sound quality of an audio dedicated device that records and plays back analog signals.

On the other hand, there has been a proposal to record another audio signal in the video area 5 of the VTR as described above. That is, for example, when θ=36°, 180°
If the rotary head rotates by an amount, five other areas such as the audio area 6 will be provided. By recording time-axis compressed audio signals independently in each area, an audio-only tape recorder capable of recording a total of six channels of audio signals can be obtained.

Below is a brief explanation of this tape recorder.
FIG. 8 is a diagram showing the tape running system of the above-mentioned tape recorder, and FIG. 9 is a diagram showing the recording locus on the tape by this tape recorder.

Note that the same numbers as in FIGS. 6 and 7 represent the same parts.

In FIG. 9, CHI to CH6 are the periods in which head 3 or head 4 traces A to B, B to C, C to D, D to E, E to F, and F to G in FIG. This is the area where audio signals are recorded. Audio signals can be recorded on each side of each area, and so-called azimuth overwriting is performed in each area, but the tracks in each area CHI to CH6 do not need to be on the same straight line. Furthermore, although a tracking control signal and a pilot signal are recorded in each area, there is no correlation between the areas.

In this multi-channel audio tape recorder,
All channels in the forward direction of the tape (for example, direction 7 in Figure 8)
However, for convenience of use, it may be possible to record and reproduce in opposite directions. At this time, for example, in FIG. 9, the areas indicated by CHI to CH3 are recorded and reproduced while traveling in the direction indicated by arrow 7, and the areas indicated by CH2 to CH2 are recorded and reproduced while traveling in the direction indicated by arrow 9. Recorded and played back. Therefore, CHI
~The slope of each track in the area shown in CH3 and CH2-C
The slope of each track in the area shown in H2 is slightly different. However, at this time, the difference in relative speed does not pose a problem because the running speed of the tape 1 is extremely small compared to the rotational speed of the head 3.4.

FIG. 10 is a time chart of recording and reproduction of the tape recorder as described above. Figure 10 (,) shows a phase detection pulse (hereinafter referred to as PC) generated in synchronization with the rotation of the rotary cylinder 2.
It is a 30Hz rectangular wave that repeats a high level "H" and a low level "L#" for 1760 seconds at PG (a)). Also, FIG. )
). Here, PG(a) is assumed to be H while the head 3 rotates from B to G in FIG. 8, and PG(b) is assumed to be H while the head 4 similarly rotates from B to G.

Figure 10(c) shows the data reading pulse obtained from PG(a), and the audio signal is sampled every other field for a period corresponding to one field (1/60 seconds) of the video signal. It is for the purpose of In FIG. 10(d), H indicates a signal processing period for adding a redundant code for error correction or changing the arrangement of one field of sampled audio data using a RAM or the like. In FIG. 10 (,), the data recording period is indicated by H, and the timing at which the recording data obtained by the above-mentioned signal processing is recorded on the tape 1 is indicated.

If we follow the flow of the signal in time using Fig. 10, we can see that t1~
The sampled data during the period t3 (while the head 3 is moving from B to G) is subjected to signal processing from t3 to t5 (the head 3 is moving from G to A), and then from t5 to t6 (when the head 3 is moving from A to B). recorded. That is, the head 3 records in the CHI area in FIG. On the other hand, data sampled while PG(b) is H is signal-processed at the same timing and recorded in the CHI area by the head 4.

The PG obtained by shifting the phase of PG(a) by a predetermined phase (in this case, 36° corresponding to one region) is the PG of FIG. 10(f) (hereinafter referred to as PG(f)).
). The case where an audio signal is recorded using this PG(f) and a PG (not shown) having the opposite polarity will be described below. The data sampled from t2 to t4 in FIG. 10 is subjected to signal processing according to the signal shown in FIG.
Recording is performed according to the signals shown in Figure (h). That is, head 3
Accordingly, the period during which this head 3 traces B-C,
It is recorded in the area indicated by CH2 in FIG. Similar Kt4~
The data sampled during the period t7 is recorded by the head 4 in the area indicated by CH2.

Next, the operation of reproducing the signal recorded in the area indicated by CH2 will be explained.

The reading of data from head f1 by head 3 is the 10th
According to the signal shown in FIG. 10 (h), the process is performed from t6 to t7 (same as from tl to t2), and from t7 to t7 according to the signal shown in FIG. 10 (i).
At t8 (tz to t3), signal processing opposite to that during recording is performed. In other words, during this period, error correction, etc. will be performed, and the 10th
A reproduced audio signal is output from t8 to t9 (t3 to t6) according to the signal shown in FIG.

Of course, the reproduction operation by the head 4 is the same as the above-mentioned operation.
This is done with a phase difference of , and thus a continuous reproduced audio signal is obtained. Also, for other areas CH3 to CH6, PG(a) is n×36cl;! Needless to say, it is sufficient to carry out the above-mentioned recording and reproducing operation based on the I-phase shift, and this does not depend on the running direction of the tape.

[Problem that the invention seeks to solve]

Since the conventional audio recording/playback device described above has a large number of channels, it is necessary for the user to know whether it is recorded or unrecorded at any position in each channel of a single tape, and to prevent accidental erasure. That becomes extremely difficult. As a countermeasure, it is conceivable to convert this information along with the audio data for each PCM audio channel into data and write it as additional data using a rotating head, but this would require searching even unrecorded parts at high speed. In addition, when you want to prevent accidentally erasing information that has been recorded once, you can import all of the data for one track, perform error correction, rewrite only the additional data, and add an error correction code again. Since the data must be recorded again, the device becomes extremely large-scale.

Generally, in order to extract digitally recorded data, a pit clock at the time of data writing is extracted, data read out using that clock is sampled, and the written data is extracted.

As a means for extracting the pit clock, a preamble section for pit clock synchronization is provided in front of the data area,
A clock oscillated by a PLL or the like was synchronized with the clock written in the preamble section and used as a bit clock.

Therefore, (a) it is necessary to provide a griample portion before the write data, which deteriorates efficiency in terms of data recording density. In particular, when data related to the recording state must be recorded in all of the divided areas as described above, the data recording density cannot be lowered.

(b) The size of the circuit such as the pit clock extraction circuit increases. (c) Since a self-clocking method for recorded data is desired for pit clock control and monitoring during data extraction, the self-clocking rate of digital modulation during recording and the data recording density become low. There was a problem such as.

This invention was made to solve this problem, and includes a sub-area in the tape length direction separate from each recording area,
It is an object of the present invention to provide a recording and reproducing device that can accurately perform data retrieval without providing a bit clock extraction circuit or the like when recording and reproducing data in this sub-area.

[Means for solving problems]

The recording and reproducing apparatus according to the present invention has recording tracks formed sequentially at angles different from the tape length direction, and records information regarding the recording state of each area separately from a plurality of areas divided in the width direction of the tape. A sub-area is provided in the length direction of the tape, and information in this sub-area is extracted by a clock signal generated based on the conveying operation of the tape conveying means.

[Effect]

In this invention, since the clock signal is generated based on the tape transport operation in accordance with the above-described configuration, data can be reproduced at any tape speed.

〔Example〕

1 to 5 are diagrams for explaining one embodiment of the present invention.

FIG. 3 is a diagram showing the relative positional relationship between the reproducing head, erasing head, and recording head on the longitudinal track as a sub-area and the multi-channel audio track area described above, and 11 is a reproducing head; 12 is an erasing head, 13 is a recording head, and 14 is a track formed in the longitudinal direction of the tape. These heads are arranged at appropriate intervals, and one erase head is placed at a distance X from the position of the audio track that is currently being recorded.
2 are arranged.

FIG. 4 shows the format of recorded data on the track 14 in FIG. 3. For example, if 2 bits are assigned to each channel, the recording status of all channels can be expressed with 6 channels x 2 bits = 12 bits. . An example of a code that cannot be expressed is OO...unrecorded 01...recorded 10...not erasable.

Further, the recording length of the recording state information of each channel on the track 14 can be easily controlled by making it the same as the head spacing explained in FIG. 3 on the tape.

However, if the head spacing cannot be made very short due to equipment problems, the information on the recording status of each channel can be stored at intervals of 6D or more, that is, 6D/v when converted to time (where V is the tape running speed). Although it can only be obtained every hour or more, as an audio device, this is still sufficient.

FIG. 5 is a timing chart showing how the longitudinal track and the audio track are recorded and reproduced according to the present invention.

In the figure, A is a waveform indicating the synchronization signal reproduced by the reproduction head 11, and when this is detected at time t2, the recorded part of the corresponding channel where the audio is currently being recorded is rewritten from this point onwards. is delayed by a predetermined time τ. Next, between time t3 and t4, the playback head 11 reads the data of the corresponding channel, determines whether the corresponding channel can be recorded, and if so, the data of the corresponding channel is read. The head 12 erases only that part. However, if the data that has been read is the same as the data that is about to be written, there is no need to perform the rewriting operation. Here, for example, if τ=(2D)/v, data of the third channel will be recorded. Then, between time t5 and time t6, a predetermined code is written by the subsequent recording head 13.

Next, the operation when a command to stop audio recording is received will be explained. If the stop switch is pressed at time t7 as shown in FIG. 5F, at the same time, the supply of the recording signal G is stopped and a recording mute signal is supplied as shown in FIG. 5H. Also, the motor drive signal is the cue signal writing end time t.
At 9, the supply is stopped and both the drum and capstan stop rotating.

FIG. 2 is an overall system diagram for explaining the present invention in detail, in which 11 is a reproducing head, 12 is an erasing head, 13 is a recording head, 14 is a longitudinal track, and 15 is an overall system diagram for explaining the present invention in detail.
is a motor control circuit, 24 is an operating section, 25 is an area specifying section,
28 is a synchronization separation circuit, 29 is a data extraction circuit, 30 is a sequence control circuit, 31 is a display circuit, and the sixth to tenth circuits.
The same number as in the figure indicates the same thing. In addition, in the following explanation, f) z4rus, noya pilot signal,
Since the PCM audio signal system is well known, a description thereof will be omitted.

Cue data reproduced from the cue signal reproduction head 11 via an amplifier 35 is led to a synchronization signal separation circuit 28 and a data extraction circuit 29. The synchronization signal separation circuit 28 supplies the timing of the obtained synchronization signal to the data sampling circuit 29, where data for six channels is separated, and the obtained cue data is sent to the sequence control circuit 30.
given to.

Further, signals from the sequence control circuit 30 are supplied to the cue signal erasing head 12 and the cue signal recording head 13 via amplifiers 36 and 37, respectively.

Further, when a track designation and a recording/playback operation command are performed on the operation unit 24, the track designation is guided through the area designation circuit 25, and the recording/playback command is directly guided to the sequence control circuit 30. . This sequence control circuit 30 includes a motor control circuit 15 that controls the capstan and drum motor based on the input designation signal for recording and reproducing operations of the cue data signal, and a display circuit 31 that displays the recording status of each channel. Display at.

FIG. 1 is a block diagram showing details of a data reproducing system according to an embodiment of the present invention shown in FIG. is a capstan, 53 is a capstan motor, 54 is a capstan/motor rotation control circuit, 55 is a pit clock generation unit for data transfer, 56 is a capstan rotation detection unit, and 57 is a pit clock generation unit for extracting data from the track 14. 58 is a reproduction amplifier, 59 is a comparator, 60 is a synchronization signal detection section, 61 is a data extraction section, 62 is a recording amplifier, 63 is a data transfer synchronization section, 64 is a synchronization signal addition section, and 65 is a system control unit, 66
is a display control unit, and 67 is a switch.

In the embodiment configured as described above, in order to control the rotation of the capstan 52, the rotation of the capstan motor 53 is detected by the capstan rotation detection section 56, and the detected signal is sent to the capstan/motor rotation control circuit 54. supplied to Now, assuming that the system of FIG. 1 is in the recording state, the switch 67 is connected to the A contact. In response to the signal detected by the capstan rotation detection section 56, a data transfer pit clock generation section 55 generates a clock signal hit clock corresponding to the rotation speed of the capstan motor 53. This clock signal and the data to which a synchronization signal has been added by the synchronization signal addition part 64 are synchronized by the data transfer synchronization part 63, and are recorded on the track 14 on the tape by the fixed head part 51 through the recording amplifier f62. The recording start portion of the recorded data (synchronization signal portion in FIG. 4) is always synchronized with the clock signal.

Next, if the system of FIG. 1 is in the regeneration state, i.e.
Switch 67 is connected to the B contact.

Now, the data recorded on the track 14 (FIG. 4) is searched at high speed, and is passed through the reproduction amplifier 58 to the comparator 59.
Detects the synchronization signal recorded at the beginning of the playback data. On the other hand, in response to the signal detected by the capstan rotation detection section 56, a data extraction pit clock generation section 57
When a clock signal is generated, as is clear from the above description of the recording mode, the synchronization signal detected by the compiler 59 is synchronized with the clock signal generated by the data extraction pit clock generation section 57 and the tape speed being searched. Matches regardless. In the synchronization signal detection section 60, the data is superimposed on the data extraction clock signal, and the data is extracted in the data extraction section 61 and supplied to the system control section 65, and the display control section 66 performs necessary display.

〔Effect of the invention〕

As explained above, the present invention is configured to transport a tape in its longitudinal direction by a transporting means, and to divide each recording area into a plurality of regions in the width direction of the tape, in which tracks are sequentially formed at angles different from the longitudinal direction of the tape. is provided with means for recording and reproducing data relating to the recording state of each of the recording areas in another sub-area in the tape length direction, and the data relating to the recording state is recorded by a clock signal formed based on the tape transport operation of the transport means. Since a means for extracting data is provided, the data can be recorded and reproduced at any tape speed, and data can be easily written and retrieved at high speed. Furthermore, since there is no need to extract a clock from reproduced data, the degree of freedom regarding the data recording format is increased, and as a result, the data recording density can also be increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing details of a reproduction system in an embodiment of the present invention, FIG. 2 is an overall system diagram for explaining the embodiment of FIG. 1, and FIG. A diagram showing the relative positional relationship between the longitudinal track and the information recording area, FIG. 4 is a diagram showing the recording form of the tape longitudinal track, and FIG. 5 is a recording timing chart of the tape longitudinal track and recording track according to the present invention. , Figure 6 shows the conventional VT
7 is a diagram showing the recording trajectory on the tape of FIG. 6, FIG. 8 is a diagram showing the tape traveling system of the conventional device, and FIG. 9 is an audio diagram of the tape running system of FIG. FIG. 10, which is a diagram showing areas where signals are recorded, is a time chart of recording and reproduction of FIG. 9. In the figure, 1 is a tape, 2 is a rotating cylinder, 3.4 is a head, 11 is a playback head, 12 is an erasing head, 1
3 is a recording head, 14 is a track in the tape length direction, 15
is a motor control circuit, 24 is an operating section, 25 is an area specifying section,
28 is a synchronization separation circuit, 29 is a data extraction circuit, 30 is a sequence control circuit, 31 is a display circuit, 51 is a fixed head section, 52 is a cab stan as a conveyance means, 53 is a cab stan motor, and 54 is a capstan motor rotation control circuit; 55 is a bit clock generation unit for data transfer; 56;
is a cabstan rotation detection section, 57 is a data extraction bit clock generation section, 58 is a reproduction amplifier, 59 is a comparator, 60 is a synchronization signal detection section, 61 is a data extraction section, 62 is a recording amplifier, 63 is a Data transfer synchronization unit, 6
4 is a synchronizing signal adding section, 65 is a system control section, 66 is a display control section, and 67 is a switch. Agent Patent Attorney 1) Haru Kitatake Figure 1 67; Switch 13;
figure

Claims (1)

[Claims] In the recording and reproducing apparatus, each recording track is sequentially formed in each area divided into a plurality of areas in the tape width direction at an angle different from the tape length direction while the tape is transported in the longitudinal direction by a transport means. Means for recording and reproducing data regarding the recording state of each of the recording areas is provided in a sub-area in the tape length direction separate from the area, and during reproduction, the data regarding the recording state is formed based on the tape conveying operation of the conveying means. A recording/reproducing device characterized in that extraction is performed using a clock signal.