JPS61144701A - Record and recording and reprodupcing device - Google Patents

Abstract

PURPOSE:To alter reproducing operation of each area by dividing a tape type recording medium lengthwise into plural areas, and recording a pilot signal for identification of specific frequency lower than the exclusive use band of an information signal in each area for a specific period. CONSTITUTION:The magnetic tape 1 is divided lengthwise into plural areas and tracks are formed successively in each area by rotary heads 3 and 4. A pilot signal generator 31 generate four different kinds of pilot signals for tracking successively by specific rotation, and each pilot signal is added 52 to an information signal from a PCM audio circuit 30 are recorded on each track. When a recording direction is inverted or when recording is stopped, the generator 31 outputs the pilot signal for identification which is lower than the exclusive use band of the information signal and different from said pilot signals for a specified period by the control of a sequence control circuit 28. When reproduction is performed, the pilot signal for identification which is detected by an ATF circuit 63 is supplied to the circuit 28 to alter reproducing operation of each area.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field> The present invention relates to a recording and recording/reproducing device, and in particular, the present invention relates to a recording and recording/reproducing device, and in particular, a tape-shaped recording medium is divided into a plurality of regions in its longitudinal direction, each region is sequentially traced by a rotating head, and each region is The present invention relates to a device for recording and recording/reproducing information signals at each time.

<Description of Prior Art> In recent years, high-density recording has been pursued in the field of magnetic recording, and even video cheap recorders (VTRs) have begun to reduce the tape running speed and perform even higher-density magnetic recording. ing. For this reason, if audio signals were recorded using a fixed head as in the past, the relative speed could not be kept high and the reproduced sound quality would deteriorate.

One solution to this problem is to make the length of the track formed by the rotary head longer than before, and to sequentially record time-base compressed audio signals on the extended portion.

For example, in a rotating two-head helical scan type VTR, the magnetic tape was conventionally wound around the rotating cylinder by more than 180 degrees;
A VTR has been devised in which the tape is wound more than θ)'' and an audio signal converted to PCM and compressed in time axis is recorded on the excess wound portion. Fig. 1 is a diagram showing the tape running system of such a VTR. FIG. 2 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 and 2 is a rotating cylinder.

3.4 is a head having mutually different azimuth angles which is attached to the cylinder 2 with a phase difference of 180°; 5 is a video area portion of a track formed on the tape 1; and 6 is an audio area portion. The video area 5 is a portion where the heads 3 and 4 traced the tape at 180° of the rotary cylinder 2, and the audio area 6 is the portion where the heads 3 and 4 traced the tape at 00 minutes of the rotary cylinder 2. Also second
In the figure, f1 to f4 indicate the frequencies of tracking pilot signals superimposed on each track using a well-known four-frequency method, and the relationship between the frequencies is (f2-fl)=f3-f
4 (f4-f2Φ2f)4. However, f)l indicates the horizontal scanning frequency of the video signal.

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, a proposal has been made to record another audio signal in the video area 5 of the above-mentioned VTR. In other words, 1. For example, when θ = 36, if the rotary head rotates by 180 degrees, the audio area like 6 will be expanded to 5 other areas.
There will be one. 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.

Hereinafter, this tape recorder will be briefly explained. FIG. 3 is a diagram showing the tape running system of the above-mentioned cheap recorder, and FIG. 4 is a diagram showing the recording locus on the tape by this tape recorder. Note that the numbering is the same as in FIGS. 1 and 842.

In FIG. 4, CHI to CH6 correspond to head 3 or head 4, respectively, from A to B in FIG.

This is an area in which an audio signal is recorded during the period of tracing from B to C1C, D to E, E to F, and F to G. It is possible to record audio signals separately in 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, and each area Pilot signals for tracking control are recorded in each region, but it is assumed that they are recorded in a predetermined rotation (f1, f2→f3→f4) for each region, and there is no correlation between the regions.

Also, the area shown as CHI-CH3 is
is recorded and reproduced when it is traveling at a predetermined speed in the direction shown by arrow 7, and the area shown by CH2-CH2 is also in the direction shown by arrow 9.
Recording and playback are performed when the vehicle is traveling in the direction shown. Therefore, as shown in FIG. 4, the slope of each track in the region CHI-CH3 and the slope of each track in the region CH2-CH2 are slightly different. However, regarding the difference in relative speed at this time, compared to the difference due to the rotation of head 3.4, tape 1
The damage caused by running is extremely small and should not be a problem.

FIG. 5 is a time chart of recording and reproduction of the tape recorder as described above. In FIG.
This is a rectangular wave t30H2(7) that repeats "high level (H)" and "low level (L)" at 0 seconds. Further, (b) is a PG with a polarity opposite to that of PG (a). Here, PG(a) is H, PC(a) while the head 3 rotates from B to G in FIG.
b) is assumed to be H while the head 4 similarly rotates from B to G.

Figure 5 (C) shows the data reading pulse obtained from PG (a), which reads the audio signal every other field for a period corresponding to one field (1/60 seconds) of the video signal. Figure 5(d) shows a signal for adding a redundant code for error correction or changing the arrangement of the sampled audio data for one field using a RAM or the like. In FIG. 5(e), the processing period is indicated by H. 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 shown.

For example, if we follow the flow of the signal in time using Fig. 5, t
The data sampled during the period l-t3 (head 3 is moving from B-G) is from t3 to t5 (head 3 is moving from G-A)
Signal processing is performed at t5-t6 (head 3 is A-B)
recorded over a period of That is, the head 3 causes C in FIG.
Recorded in the HI 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° for one region)
The phase-shifted PG is shown in FIG. 5(f).

Hereinafter, a case will be described in which an audio signal is recorded using PG (f) and a PG (not shown) having the opposite characteristics.

The data sampled from t2 to t4 in FIG.
The signal is processed according to the signal shown in FIG. 5(g) between 76 and t6, and recorded according to the signal shown in FIG. 5(h) during the period from 76 to t7. That is, the head 3 causes the head 3 to
The period during which C is traced is recorded in the area indicated by CH2 in FIG. The 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 TE and -PL from t6 to t7 (the same goes for tl-t2) according to the signals shown in FIG. 5 (Ch), and from t7 to t8 according to the signals shown in FIG.
At (t2 to t3), signal distortion is performed in the opposite direction to that during recording.

That is, error correction and the like are performed during this period, and a reproduced audio signal is output from t8 to t9 (t3 to tS) in accordance with the signal shown in FIG. 5N). Of course, the reproduction operation by the head 4 is performed with a phase difference of 1800 degrees from the above-mentioned operation, and thus a continuous reproduction audio signal is obtained.

Also, regarding other areas CH3 to CH6, PG (a)
1 by shifting the phase by nX36°. Needless to say, the above-described recording and reproducing operation can be performed using the same method, and this does not depend on the running direction of the tape.

In this way, the VTR can be used as a multi-channel audio-only device.
can be used. When performing continuous long-term recording and playback on such a multi-channel audio-only device,
For example, you can record in the CHI area, and when you get near the end of the tape, you can run the tape in the opposite direction and record in the CH4 area, for example.However, when you want to play this back, at what timing and in which area? It is inconvenient that it is not possible to determine whether the data was recorded continuously, which is caused by multiple channels.

Furthermore, in a typical 8-track audio tape recorder, it is difficult to provide other tracks and record control signals for the well-known cueing and forced stopping operations due to the large number of channels.

<Object of the Invention> The present invention has been made in view of the above-mentioned background, and an object of the present invention is to provide a recording and recording/playback device that can specify the necessary playback operation change position for each area. .

<Explanation based on examples> Hereinafter, the present invention will be explained in detail using examples.

FIG. 6 is a diagram showing a schematic configuration of a tape recorder as an embodiment of the present invention, and the numbering in FIG. 6 is the same as in FIGS. 1 and 2.

The rotational phase of the rotary cylinder 2 is detected by the detector 11 to obtain the above-mentioned PG. The PG is supplied to a phase comparator 13 via a phase shifter 12, where the frequency of the fundamental oscillator 14 is divided by a frequency divider 15 to 1/m, and the phase is compared with a pulse whose frequency is lowered to 30 Hz. . The drive circuit 16 is then controlled based on this error voltage. This allows cylinder 2
rotates at a predetermined rotation speed and a predetermined phase.

A pair of capstans for driving the magnetic tape l are provided to run the tape l in both directions, and motors for driving these capstans 17 and 18 are connected to a switch circuit 19. Further, FC pulses representing the rotational phase of the capstans 17 and 18 are obtained from detectors 20 and 21, respectively, and these are connected to a switch circuit 22. The output of the switch circuit 22 is an amplifier 23
The frequency is divided into 1/n by the frequency divider 24 through the 30Hz
and is supplied to the rear phase comparator 25. Here, the output of the frequency divider 24 and the output of the frequency divider 25 are compared in phase and guided to the R side terminal of the switch circuit 26. At this time, the output of the phase comparator 26 is controlled by a drive circuit 27 so that the capstan 17 or 18 rotates at a predetermined speed during recording. In addition, the switch circuit 19゜22 is the sequence control circuit 28.
When the tape is run in the forward direction (arrow 7), it is connected to the A side, and when the tape is run in the reverse direction (arrow 9), it is connected to the B side.

During recording, when an analog audio signal is input from the terminal 29 and supplied to the PCM audio circuit 30, it is sampled as described above and further subjected to signal processing including PCM conversion, thereby creating data for recording. On the other hand, a pilot signal for tracking is generated by a pilot signal generator 31, in which signals having four different frequencies for each track are sequentially generated in a predetermined rotation (fx→f2→f3→f4).

FIG. 7 is a diagram showing a specific example of the configuration of the pilot signal generator 31, in which the reference oscillator 32 is set at different ratios (1/N
1, 1/'N2, 1/N3, 1/N4), four types of frequency dividers 33, 34°35.36 are provided, and their outputs are sequentially divided in a predetermined rotation every 1/60 seconds. Terminal 50 via switch circuits 37, 38, 39, 40
is supplied to the switch circuit 51 in FIG.

42 is a terminal to which the PG output from the phase shifter 12 is supplied, and the PG output from the phase shifter 12 is shown in FIG.
).

The outputs of the PG and frequency divider 45 are connected to logic gate groups 46, 47.
48.48 and according to this logic switch 37
．． It is turned on sequentially for 1/60 seconds with a rotation of 38, 39, and 40. As a result, the terminal 50 has fl-+
The tracking pilot signal is supplied in a rotation of f2→f3→f4.

The tracking pilot signal thus obtained is supplied to the adder 52 via the R-side terminal of the switch circuit 51 during recording. On the other hand, recording audio data output from the PCM audio circuit 30 is also supplied to the adder 52.
Here, it is frequency multiplexed with the tracking pilot signal and supplied to the rotary heads 3 and 4 via the amplifier 53, the R side terminal of the switch circuit 54, and the switch circuits 55 and 56.

This time recording/reproduction control circuit 57 controls the P obtained from the phase shifter 12.
P so that the audio signal is recorded in the area corresponding to the channel set by the channel designation circuit 58 using G.
The signal processing timing in the CM audio circuit 30 and the on-timing of the switch circuits 55 and 56 are controlled. It goes without saying that this channel designation circuit 58 is constructed so that the user can freely designate a channel by operating the operation section 59.

Next, a case will be described in which necessary information such as reversing the recording direction and stopping recording is recorded. Now, let us consider detecting the position where reverse recording was performed during playback. When reverse recording is commanded by manual operation of the operation unit 59 or when it is detected by some method that it is close to the end, reverse recording is automatically started and recording is continued, the sequence control circuit 28 causes the selection circuit 105 to perform a predetermined process. A data signal 106 is supplied for a predetermined period.

Then, one or more types of identification pilot signals of specific frequencies obtained from the period frequency dividers lo1 to 104 are extracted from the selection circuit 105, supplied to the adder 107, and mixed with the tracking pilot signal. This mixed pilot signal is outputted from the terminal 50 and, for example, in this case, a signal having a frequency of f6 outputted from the frequency divider 102 is supplied to the adder 107 as an identification pilot signal.

Also, the part immediately after recording starts is detected during playback.
In other words, consider what is called cueing. Operation unit 59
When recording is started by manual operation of
Supply on 05. Along with this, one or more of the outputs of the frequency dividers 101-104 will be selected in another pattern, and this will be added to the tracking pilot signal as an identification pilot signal, and this mixed pilot signal will be used as the terminal terminal. A signal having a frequency of f7, which is the output of the frequency divider 103, is added to the tracking pilot signal outputted from the frequency divider 103.

FIG. 8 is a diagram showing the recording pattern in the area during the designated period at the start of recording.

The periods indicated by τ are fl, f2 . f3. An identification pilot signal f6 is recorded together with a tracking pilot signal having a frequency of f4.

After this period has passed, only the tracking pilot signal is recorded superimposed on the audio signal as usual. Therefore, the frequency of this tracking signal for identification must be set below the dedicated audio signal band.On the other hand, when the specified predetermined period just before the above-mentioned reverse recording has passed, the sequence control circuit 28 controls the drive circuit 27 to After stopping running, the switch circuits 19 and 22 are controlled to connect to the B side. Further, the channel specifying circuit 58 may be used to specify a predetermined channel.For example, if the area indicated by CHI is being recorded, the area indicated by CH4 may be specified.

Next, we will explain the operation during playback of the 0-rotation heads 3 and 4.
The audio data signal, tracking pilot signal, and identification pilot signal reproduced from the PCM audio circuit 30 and the L
The signal is supplied to a PF (low pass filter) 61.

The PCM audio circuit 30 performs processing such as error correction and one time axis extension on the obtained data, and obtains a reproduced audio signal at the above-mentioned timing controlled by the recording/reproducing control circuit 57.
Output from terminal 62.

On the other hand, a tracking pilot signal and an identification pilot signal are obtained from the LPF 61 and guided to an ATF circuit 63. A tracking pilot signal is also input to the ATF circuit 63 from the pilot signal generator 31 via the R side terminal of the switch circuit 51 in a normal rotation. As a result of these, the A/F circuit 63 obtains a tracking error signal as described later, and supplies it to the drive circuit 27 via the P side terminal of the switch circuit 26. This controls the capstan 17 or 18 and performs tracking control.

FIG. 9 is a diagram showing an example of a specific configuration of the ATF circuit 63. In FIG. 9, a reproduction pilot signal for tracking and identification is supplied to a terminal 71 via an LPF 61.

On the other hand, a pilot signal obtained from the generator 31 is supplied to the terminal 70 via the P-side terminal of the switch circuit 51. These are multiplied by a multiplier 72, and tracking error detection consists of a BPF (band pass filter) 73 that separates the fH acid component, a BPF 74 that separates the 3fH component, a detection circuit 75, 76, a comparator 77, an inverting amplifier 78, and a switch circuit 79. A switch circuit 79 supplied to the circuit is appropriately controlled by a PG supplied to a terminal 80, and the output of this switch circuit 79 is supplied to a sample hold circuit (S/H) 81.

The terminal 83 is connected to the recording/reproducing control circuit 57 described above.

A pulse indicating the timing when the reproducing head traces approximately the center of the reproduction area is supplied, and the S/H 81 operates according to the pulse. In this way, the output of the S/H81 is made into a tracking nib signal, and the switch circuit 2
The signal is supplied to the drive circuit 27 via the P-side terminal of 6.

Next, the operation when an attempt is made to reproduce a track of a specified period in which at least one kind of identification pilot signal is recorded as described above will be explained.

A high level signal is obtained from the recording/reproducing control circuit 57 to the terminal 103 when the head 3 or 4 is tracing the relevant reproduction area. The BPFs 124 to 127 are used to separate frequency components of the identification pilot signal, respectively, and their outputs are compared with the reference level 108 by comparators 109 to 112. and these comparators 1
Outputs 09-112 are supplied to the sequence control circuit 28 via terminals 113-116.

Therefore, when reproducing the normal recorded portion, terminals 113 to 11
6, H output cannot be obtained.

When the specified period at the start of recording is being reproduced, an H output is obtained from the terminal 114, and these are supplied to the sequence control circuit 28 as 4-bit data.

The sequence control circuit 2 responds to such 4-bit output.
8 causes the drive circuit 27 to stop the running of the tape 1 at the recording start portion.

Further, immediately before reverse recording, the sequence control circuit 28 causes the drive circuit 27 to stop the running of the tape l, and switches the connections of the switch circuits 19 and 22. At this time, the channel designation circuit 28 is controlled to designate a predetermined channel to be switched by reverse reproduction.

Incidentally, in the above embodiment, only the transition to a specified channel during playback and reverse playback was described;
It is also possible to automatically designate the channel to be migrated by varying the length of the designated period or by making each channel correspond to each identification pilot signal pattern.

As described above, according to the present invention, recording and recording operations can be performed in which it is possible to easily specify the playback operation change position required for each area divided in the longitudinal direction of a tape-shaped recording medium. A recording and reproducing device is obtained.

[Brief explanation of drawings]

Figure 1 shows the tape running system of a conventional VTR, Figure 2 shows the recording locus on the magnetic tape by the VTR shown in Figure 1, and Figure 3 shows the tape running system of a multi-channel tape recorder. FIG. 4 is a diagram showing the recording locus on the magnetic tape by the tape recorder shown in FIG. 3, FIG. 5 is a time chart of recording and reproduction of the tape recorder shown in FIG. 3, and FIG. FIG. 1 is a diagram showing a schematic configuration of a tape recorder as an example. wIJ7 is a diagram showing a specific example of the configuration of the pilot signal generator in FIG. 6. FIG. 8 is a diagram showing a recording pattern in one area of a designated period, and FIG. 9 is a diagram showing an example of a specific configuration of the ATF circuit in FIG. 6. 1 is a magnetic tape as a recording medium; 3 and 4 are rotary heads; 28 is a sequence control circuit; 30 is a PCM audio circuit; 31 is a pilot signal generator; 52 is an adder;
7 is a recording/playback control circuit, 58 is a channel designation circuit, 63 is an ATF circuit, 101-104 is a frequency divider, 105 is a selection circuit, 124-127 are BPFs, fl, f2, f3
. f4 is the frequency of the tracking pilot signal, f
6 indicates the frequency of the identification pilot signal, and CHI-CH6 indicate the audio signal recording areas, respectively.

Claims (2)

[Claims] (1) A tape-shaped recording medium is divided into a plurality of regions in the longitudinal direction, and tracks are sequentially formed in each region by a rotating head, and each track is provided with multiple types of tracking pilot signals and information having different frequencies. and a predetermined device for recording an identification pilot signal of a specific frequency that is below the exclusive band of the information signal for each region and that is different from all frequencies of the plurality of types of tracking pilot signals. A recording device characterized by recording for a period of time. (2) A tape-shaped recording medium is divided into a plurality of regions in the longitudinal direction, and tracks are sequentially formed in each region by a rotating head, and multiple types of pilot signals and information signals having different frequencies are transmitted to each track. and reproduces the information signal from each of the areas, the frequency of each area being lower than the exclusive band of the information signal and different from all the frequencies of the tracking pilot signals of the plurality of types at the time of recording. 1. A recording and reproducing device that records an identification pilot signal on a specific frequency for a designated predetermined period, and when reproducing, detects the presence or absence of the identification pilot signal and changes the reproducing operation.