JPS61237202A - Multichannel recording or playback equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention divides a tape-shaped recording medium into a plurality of regions in its width direction, and sequentially tracks each region at an angle different from the longitudinal direction of the tape. The present invention relates to a recording/reproducing device for recording and reproducing signals.

[Conventional technology]

In recent years, high-density recording has been pursued in the field of magnetic recording, and even in video 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 chip 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 an audio signal which has been converted into PCM and time-axis compressed in the audio area is reproduced in this way is extremely high and is comparable to the sound quality of an audio-only device that records and reproduces 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°, ]80°
If the rotary head rotates by an amount, five other areas such as the audio area 6 will be provided.

By recording time-base compressed audio signals independently in each area, an audio-only chip 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-CH6 is during the period when head 3 or head 4 is tracing from 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 separately in each area, and so-called asomass 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. Further, a pilot signal for tracking control is recorded in each area, but 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 area shown by CHI-CH3 is recorded and reproduced while traveling in the direction shown by arrow 7, and the area shown by CH2-CH2 is recorded and reproduced while traveling in the direction shown by arrow 9. Recorded and played back. Therefore, CH
The slope of each track in the area shown in I to CH3 and CH2-
The slope of each track in the area shown in CH2 is slightly different.

However, at this time, regarding the difference in relative speed,
It is assumed that the running speed of Qi fl is extremely small compared to the rotational speed of Q, so it does not pose a problem.

FIG. 1O is a time chart of recording and reproduction of the tape recorder as described above. FIG. 10(a) shows a phase detection Noculus (hereinafter referred to as PG) generated in synchronization with the rotation of the rotary cylinder 2.
(referred to as (a)) is a 30 Hz rectangular wave that repeats high level "H" and low level "L" every 1/60 seconds.

However, the same figure (b) is a PG (hereinafter referred to as PG (b)) with the opposite polarity to PG (a). Here, PG (a) is H while the head 3 rotates from B to G in FIG.
) is assumed to be H while the head 4 rotates from B to G.

Figure 10(c) shows the data reading /4' pulse obtained from PG (a) for one field (1/60) of the video signal.
This is for sampling the audio signal every other field for a period corresponding to 2 seconds). In FIG. 10(d), H indicates a signal processing period during which a redundant code for error correction or the like is added to the sampled audio data for one field using a RAM or the like, or the arrangement is changed. In FIG. 1O (,), 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 signal flow in time using Figure 1O, we can see that tl-
The sampled data during the period t3 (while head 3 is moving from B to G) is subjected to signal processing from t3 to t5 (head 3 is from a to A), and then from t5 to t6 (when head 3 is from A to B). recorded. That is, the head 3 records in the area CH1 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 case where an audio signal is recorded using 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 processed according to the signal shown in FIG. 10(g) during t4 to t6, and recorded according to the signal shown in FIG. 10(h) during t6 to t7. . That is, data is recorded by the head 3 in the area indicated by CH2 in FIG. 9 during the period when the head 3 traces B to C.

Similarly, data sampled during the period Kt4 to t7 is recorded by the helad 4 in the area indicated by CH2.

Next, the operation of reproducing the signal recorded in the area indicated by CI (2) will be explained.

The head 3 reads data from the tape l at the 10th
It is performed from t6 to t7 (the same goes for tl to t2) according to the signal shown in FIG. 10 (h), and from t7 according to the signal shown in FIG. 10 (i).
From t8 to t8 (t2 to t3), reverse signal processing is performed during recording. In other words, during this period, error correction, etc. will be performed, and the 1st O
A reproduced audio signal is output from t8 to t9 (t3 to t6) according to the signal shown in FIG. Of course, the playback operation by the head 4 is performed with a phase difference of 180° from the above-described operation, so that a continuous playback audio signal can be obtained.

Also, regarding other areas CH3 to CH6, PG (a
) by n×36° and perform the above-mentioned recording and reproducing operation based on this, 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 22 worth of data, perform error correction, rewrite only the additional data, and add an error correction code again. Since the data must be re-recorded, there is a problem in that the device becomes extremely complicated.

The present invention has been made to solve these problems, and an object of the present invention is to provide a recording/reproducing apparatus that can easily record information regarding recording and unrecording in each area divided into a plurality of areas in the tape width direction.

[Failure to solve the problem]

The recording/reproducing apparatus according to the present invention records information in each area separately from recording tracks 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.
A sub-area in the tape length direction for recording information regarding unrecorded areas is provided, and means for recording and reproducing information in this sub-area is provided.

[Effect]

In this invention, based on the above-described configuration, information regarding recording and unrecording in each area is reproduced without reproducing the data recorded in each area, and information is recorded and reproduced for each area. By doing so, it became possible to record this information extremely easily.

〔Example〕

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

FIG. 2 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. 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.

Figure 3 shows the format of recorded data on the track 14 in Figure 2. 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. . Examples of codes that cannot be expressed are: 00...Unrecorded Ol...Recorded 10-...Cannot be erased.

Additionally, check bits for these codes are additionally added at the end. This may be done by any inspection method such as CRC inspection, parity check, etc. With such a bit configuration, the recorded data will be 16 bits in total. You can take a majority vote using three consecutive pieces of data without adding any check bits and decide which data has the highest frequency as the correct one, or you can use the data as is without any of these operations. Since the recording frequency is quite low, the probability of data errors is low.
There is almost no problem in practical use.

FIG. 1 is an overall system diagram showing an embodiment of the present invention, in which 11 is a reproducing head, 12 is an erasing head, and 13 is an erasing head.
14 is a recording head, 14 is a longitudinal track, 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, and 31 is a display circuit. , the same numbers as in FIGS. 6 to 1O indicate the same parts. In addition, in the following explanation, since the Gutnoculus, No. 9 Ilot M, and pcM audio signal systems are well known,
Explanation 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 provided to the sequence control circuit 30.

Further, signals from the sequence control circuit 30 are supplied to the cue signal erasing head 12 and the key 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 sent via the area designation circuit 25, and the recording/playback command is sent directly to the sequence control circuit 3o. be guided. 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.

4 and 5 are flowcharts of the system in the sequence control circuit 30. Figure 4 shows how the cassette is loaded, performs a preliminary run and detects the initial recording state, and Figure 5 shows how to specify and record the channel after that.
This is a flowchart of the main operations from when a regeneration command is issued until the next stop button is pressed.

In FIG. 4, (1) when the cassette is loaded, (
3) Perform a chive travel drive, and in order to know the initial recording state, (4) perform preliminary travel for a certain period of time. (2) If the cassette is not loaded, issue a cassette loading instruction; (5) if a cue signal already recorded during the tape running period is detected; (6) set N = O; (8) The reproduced cue data is determined, and (9) tape running is stopped. On the other hand, if no recording cue data is detected even after a certain period of time has elapsed, (7) it is determined that the tape is unrecorded, N=1 is set, and (9) tape running is stopped. If tape running stops, α
It is rewound to the initial position Q, and the recording status of all channels C1 is displayed on the display circuit 31 using LEDs, etc., and the next operation is awaited.

Next, a system flowchart during recording or reproduction will be explained with reference to FIG.

Looking at the recording status from the display circuit 31, first, specify e◇channel and specify whether to reproduce or record the specified channel. (Foundation) If not designated, designate again; (C) In the case of record designation, (C)
If N = 1 (i.e., unrecorded channel f) from the display in Fig. 4 (1η), the recording operation begins. If so, (c) it will wait again for the input of a new channel designation.
(Incorporated) Starts tape running drive, (a) Records cue data, and performs a series of operations. (1) The playback queue data is constantly monitored, and if data is obtained from a G-recorded tape, N=O is set, and it is determined whether or not it can be erased based on the 0-Q data. (2) Check whether the channel currently being recorded has a code to prevent accidental erasure, and if recording is possible, continue recording, and (2) display the status of other channels as well. As a result of the determination in (1), if the cue data cannot be obtained for an unrecorded tape, N=1 is set (to), the recording status of all channels is similarly displayed, and recording is continued. (g) If the stop switch button is pressed, tape running is stopped, but if it is not pressed, recording continues again and at the same time, cue data is captured. Furthermore, if it is determined that the cue data cannot be recorded on the channel corresponding to 01, recording is stopped and (c) tape running is stopped.

On the other hand, if the (to) playback mode is specified, 0η tape running drive is started in response to this, and the same as when recording (
(g) Playback and (g) Import cue data. If there is no 0Q queue data, set N = 4 as an unrecorded tape, and if θN) queue data is captured, set N = 0,
O'4 Determine the data, 0] Then, in either of the above two cases, the recording status is displayed and whether or not the next stop switch is input is checked. ■If the stop switch is not input, (to) playback and (g) import cue data again, but if there is a stop command, (c) stops tape running and waits for the next operation input. .

In the above embodiment, after the cassette is loaded, the tape is driven for a certain period of time, and only the initial recording state is checked. It is also possible to perform high-speed reading in advance and display this as two-dimensional information on a monitor or the like.

Further, although the above-mentioned cue data recording is only performed when recording at the same time as audio information recording, it is also possible to change the state in which only the cue data can be erased to prevent accidental erasure.

〔Effect of the invention〕

As described above, the present invention provides a recording and reproducing apparatus that sequentially forms recording tracks in each of a plurality of areas divided in the width direction of a recording tape at an angle different from the tape length direction. By recording and reproducing information regarding recording and non-recording in each recording area in a sub-area in the tape length direction that is separate from the area, there is an effect that maintenance management and operation of a plurality of channels can be made extremely easy.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram showing an embodiment of the present invention;
FIG. 2 is a diagram showing the relative positional relationship between the tape length direction track and the recording track, FIG. 3 is a diagram showing the recording form of the tape length direction track, and FIGS. 4 and 5 are the sequence control circuit of FIG. 1. 6 is a diagram showing the tape running system of a conventional VTR, and FIG. 7 is a flowchart of the system in .
FIG. 8 is a diagram showing the TE and -Z running systems of the conventional device. FIG. 9 is a diagram showing the area where the audio signal in FIG. 8 is recorded. The figure is a time chart of recording and reproduction of FIG. 9. In the figure, l 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 operation 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, and 31 is a display circuit. Agent Patent Attorney 1) Haru Kitatake Figure 4

Claims (2)

[Claims] (1) In a recording/playback device that sequentially forms recording tracks in each of multiple areas divided in the tape width direction at an angle different from the tape length direction, the tape length is different from each recording area. 1. A recording and reproducing apparatus, characterized in that a sub-area is provided in each direction, and means is provided for recording and reproducing information regarding recording and non-recording at each position of each recording area. (2) The recording/reproducing apparatus according to claim (1), further comprising means for displaying information regarding recorded and unrecorded information reproduced from the sub-area.