JPS61237203A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate maintenance control and operation of plural channels by recording and reproducing information regarding recording states of respective recording areas in a subordinate lengthwise area on a tape which is different from respective recording areas on the tape independently on time-division basis. CONSTITUTION:Cue data reproduced by a playback head 11 for a cue signal through an amplifier 35 is led to a synchronizing signal separating circuit 28 and a data sampling circuit 29. The data is separated there into data of six channels, which are supplied to a sequence control circuit 30. An erasing head 12 and a recording head 13 for the cue signal are supplied with signals from the circuit 30 through amplifiers 36 and 37 respectively. When track specification and the commanding of the recording or reproducing operation are performed at an operation part 24, said tack specification is led to the circuit 30 through an area specifying circuit 25 and the command of the recording or reproducing operation of the cue data signal is led directly. This sequence control circuit 30 displays recording states of a control circuit 15 which controls a capstan and a drum motor and respective channels on a display circuit 31 on the basis of the specifying signal for the recording or reproducing operation of the cue data signal.

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 and reproducing device that records and reproduces signals.

[Conventional technology]

In recent years, in the field of magnetic recording, high-density recording has been pursued, and even video tape recorders (hereinafter referred to as VTRs) have begun to reduce the running speed of the tape 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 in the past, and audio signals compressed in the time axis are sequentially recorded on the extended portion.

Figure 7 is a diagram showing the tape running system of a conventional VTR.
FIG. 8 is a diagram showing a recording trajectory 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 and 4 are magnetic heads (hereinafter referred to as heads) that are attached to cylinder 2 with a phase difference of 180' and have mutually different azimuth angles, and 5 is a rotary cylinder. The video area portion 6 of the track formed on the tape l is also an audio area portion. The video area 5 is located in the head 3 at 180° of the rotating cylinder 2.
4 is the part where the tape was traced, and the audio area 6 is the part where the heads 3 and 4 traced the tape at 00 minutes of the rotary cylinder 2.

When the audio signal is converted into PCM and time-axis compressed in the audio area in this way, the sound quality 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-base 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. 9 is a diagram showing the tape running system of the above-mentioned tape recorder, and FIG. 1O is a diagram showing the recording locus on the tape by this tape recorder.

Note that the same numbers as in FIGS. 7 and 8 represent the same items.

In FIG. 10, CHI-CH6 indicates that head 3 or head 4 is connected to A to B, B to C, and C in FIG.
This is an area in which audio signals are recorded during the period when tracing from D to E, from g to F, and from F to G. Audio signals can be recorded separately in each area, and so-called anomalous 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, pilot signals for tracking control are recorded in each area, but there is also 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 9)
However, for convenience of use, it may be possible to record and reproduce in opposite directions. At this time, for example, in FIG. 1O, the area indicated by CHI-CH3 is recorded and reproduced while traveling in the direction indicated by arrow 7, and the area indicated by CI(4-C)H6 is similarly indicated by arrow 9.
Recording and playback are performed when the vehicle is traveling in the direction shown. Therefore, the slope of each track in the area shown in CHI - CH3,
The slope of each track in the area CH2-CH2 is slightly different. However, at this time, regarding the difference in relative speed,
Compared to the rotational speed of wheels 3 and 4, the traveling speed of wheel 7'l is extremely small and should not be a problem.

FIG. 11 is a time chart of recording and reproduction of the tape recorder as described above. Figure 11 (,) shows a phase detection pulse (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 ``H'' and ``L'' in 1/60 seconds. However, in the same figure (b), P has the opposite polarity to PC (a).
G (hereinafter referred to as pc(b)). Here, PG (
a) is H while the head 3 rotates from B to G in FIG.
It is assumed that PG(b) is H while the head 4 similarly rotates from B to G.

Figure 11 (c) shows the data reading pulse obtained from PG (a), which corresponds to one field of the video signal (1/60 seconds).
The purpose of this is to sample the audio signal every 174 seconds for a period corresponding to .

In FIG. 11(d), H indicates a signal processing period in which the sampled audio data for one field is added with a redundant code for error correction using a RAM or the like, and the arrangement is not changed. In FIG. 11 (,), 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 Fig. 11, tl-
The data sampled during the period H3 (while head 3 is moving from B to G) is subjected to signal processing from t3 to tS (head 3 is G to A), and during the period t5 to t6 (head 3 is moving from A to B). recorded. That is, the head 3 produces CHI in FIG. 1θ.
recorded in the area. 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.

PG (a) at a predetermined phase (here, 36° within one region)
The phase-shifted PC is referred to as PG (hereinafter 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. 11 is shown in Fig. 11 (g
), and recorded according to the signals shown in FIG. 11(h) during the period from t6 to t7.

That is, data is recorded by the head 3 in the area indicated by CH2 in FIG. 1O during the period when the head 3 traces B-C. Similarly, data sampled during the period t4 to 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 head 3 reads data from the tape 1 at the 11th
It is performed from t6 to t7 (the same goes for tl to t2) according to the signal shown in FIG. 11(h), and from t7 according to the signal shown in FIG. 11(i).
~t8 (t2 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 11th
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 1800 degrees from the above-described operation, and thus a continuous playback audio signal is obtained.

Also, regarding other regions CH3 to cH6, PG (a
) by nX36° 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 possible to convert this information into data along with the audio data for each PCM audio channel and write the additional data with a rotating head, but this would require searching at high speed to reach unrecorded parts. Also, if you want to prevent accidentally erasing the information that has been recorded, you can: ■ Import all the data for the track, perform error correction, rewrite only the additional data, and add the error correction code again. The problem is that the device has to be re-recorded, making the device extremely labor intensive.

The present invention was made in order to solve this problem, and aims to provide a recording and reproducing device that can record and rewrite information regarding the recording state of each area divided into a plurality of areas in the tape width direction with a simple configuration. purpose.

[Means for solving problems]

The recording and reproducing apparatus according to the present invention independently records information regarding recording in each area, in addition to 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 length direction of the tape is provided for time-division recording, and means is provided for recording and reproducing information in this sub-area.

[Effect]

In this invention, based on the above-described configuration, information regarding recorded and unrecorded areas in each area is reproduced without reproducing the data recorded in each area, and the information is recorded and reproduced for each area. By doing so, it became possible to re-record with an extremely simple configuration.

〔Example〕

1 to 6 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 aforementioned multi-channel audio track area, where 11 indicates the 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 τ, and the erasing head 12 is arranged at a distance X from the position of the audio track currently being recorded.

FIG. 3 shows the format of recorded data on the track 14 in FIG. 2. For example, if 2 bits are assigned to each channel, 6 channels x 2 bits = 12 bits, and the recorded state of all channels can be expressed with 6 channels x 2 bits = 12 bits. Can be done. Examples of codes that cannot be expressed are: 00...Unrecorded OL...Recorded IO...Cannot be erased.

However, 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. 2 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 is recorded at intervals of 6D or more, that is, 6Vυ hours (where τ is the tape running speed). Although it can only be obtained for each of the above,
However, as an audio device, this is still sufficient.

FIG. 4 is a timing chart showing how the longitudinal track and 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.

Next, between time t3 and t4, the reproduction head 1
At step 1, the r-record of the corresponding channel is read, and it is determined whether or not the corresponding channel is recordable. If it is possible, only that portion is erased by the subsequent erasing head 12. 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 ff=(2D)/τ, data of the third channel will be recorded.

Then, between time t5 and time t6, a predetermined code is written in the next subsequent recording area using code 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. 4F, at the same time, the supply of the recording signal G is stopped and the recording meet signal is supplied as shown in FIG. 4H. Also, the motor drive signal is the cue signal writing end time t.
At 8, the supply is stopped and both the drum and capstan stop rotating.

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 number in FIGS. 7 to 11 indicates the same thing. In addition, in the following description, the PCM audio signal system is well known and has been well known in the past, so 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 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 cue signal recording head 13 via amplifiers 36 and 37i, 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 recording/reproduction operation designation signal of the input cue data signal, and a circuit that displays the recording status of each channel. Displayed at 31.

5 and 6 are flowcharts of the system in the sequence control circuit 30. Figure 5 shows how the cassette is loaded, performs a preliminary run and detects the initial recording state, and Figure 6 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. 5, (1) when the cassette is loaded, (
3) Drive the tape to run, and in order to know the initial recording state, (4) perform preliminary running for a certain period of time. (2) If, Kase,
(5) If a cue signal already recorded during the tape running period is detected, (6) N=O, and (8) the played cue Determine the data and (9) stop tape running. 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 the tape stops running, it is rewound to the α1 initial position in any case, and the recording status of all channels αη is changed to L.
It is displayed via the display circuit 31 in an ED or the like and waits for the next operation.

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, 01) channel designation and designation of whether to reproduce or record the designated channel. (b) If it is not specified, specify it again, and (c) in the case of recording specification.
If N=1 (that is, an unrecorded tape) from the display in FIG. (c) The system waits for input of a new channel designation again. (b) Recording operation supplies recording current, (c)
A series of operations are performed to start tape running and record tape cue data. Then, (1) the playback queue data is constantly monitored, and 61) if data is obtained from a recorded tape, N = 0, and it is determined whether or not it can be erased by 0, etc. 01 Check whether the channel currently recording has a code to prevent accidental erasure.
If recording is possible, continue recording, and (b) display the status of other channels as well. As a result of the determination in (g), if the cue data cannot be obtained for an unrecorded tape, o4N is set to 1, the recording status of all channels is similarly displayed, and recording is continued. (2) If the button of the stop switch is pressed, tape running is stopped, but if it is not pressed, recording continues again and key data is taken in at the same time. If it is determined that the cue data cannot be recorded in 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, 071 tape running drive is started accordingly, and the same as when recording.
(b) Playback and (b) Key-data import.

■If there is no cue data, N = 1 as an unrecorded tape
If 0η queue data is taken in, set N=0 and (6) discriminate that data. 01 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 there is no input from the stop switch, the playback will start again (to)
(to) Capture cue data, but (if a stop command is issued) stop tape running and wait 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 explained above, the present invention provides a recording/reproducing apparatus that sequentially forms a recording track 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 the recording status of each recording area independently and in a time-sharing manner in separate sub-areas in the tape length direction, maintenance, management, and operation of multiple channels can be made extremely easy. .

[Brief explanation of drawings]

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 FIG. 4 is a diagram showing the tape length direction track and recording track according to the present invention. 5 and 6 are flowcharts of the system in the sequence control circuit of FIG. 1, FIG. 7 is a diagram showing the tape running system of a conventional VTR, and FIG. FIG. 9 is a diagram showing the tape running system of a conventional device. FIG. 1O is a diagram showing the area where the audio signal in FIG. 9 is recorded. FIG. This is a playback time chart. 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, and 31 is a display circuit.

Claims (2)

[Claims] (1) In a recording/reproducing device that sequentially forms a recording track in each area divided into a plurality of areas in the width direction of the recording tape at an angle different from the tape length direction, the tape length is different from that of each recording area. A sub-area is provided in the tape sub-direction, and means is provided for independently and time-divisionally recording and reproducing information regarding the recording state at each position in the longitudinal direction of each of the recording areas at positions in the sub-area adjacent to the tape sub-direction. A recording/reproducing device characterized by: (2) The recording and reproducing apparatus according to claim (1), further comprising means for displaying information regarding the recording state reproduced from the sub-area.