JPS61144706A - Record and recording-and reproducing device - Google Patents

Abstract

PURPOSE:To alter reproducing operation of every area by dividing a tape type recording medium lengthwise into plural areas and inhibiting >=1 kinds of pilot signals among plural pilot signals from being recorded 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 generates plural kinds of pilot signals of different frequency in specific order and the respective pilot signals are recorded on each track while added to information signals from a PCM audio circuit 30. When the recording direction is inverted or when the recording is stopped, a sequence control circuit 28 inhibits at least >=1 kinds of pilot signals among the plural kinds of pilot signals from being outputted. When they are reproduced, an ATF circuit 63 detects the specific pilot signal not being recorded and the circuit 28 alters the 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 the Prior Art> In recent years, high-density recording has been pursued in the field of magnetic recording, and even in video tape recorders (VTRs), tape running speeds have been reduced to perform even higher-density magnetic recording. There is. Therefore, 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, l 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 the part where the heads 3 and 4 traced the tape at 180° of the rotary cylinder 2, 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. Also second
In the figure, f1 to f4 indicate the frequencies of tracking pilot signals superimposed on each track using the well-known four-frequency method, and the frequency relationship is (f2-ft) = f3-f
4㎟f)l, which is f4-f2*2fH. However, fH 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. That is, for example, when θ=36, if the rotary head rotates by 180 degrees, the audio area 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.

This tape recorder will be briefly explained below. FIG. 3 is a diagram showing the tape running system of the above-mentioned tape 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 2.

In FIG. 4, CHI-CH6 are respectively head 3 or head 4 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. Audio signals can be recorded separately in each area, and so-called azimuth overwriting is performed in each area, but the tracks in each area CHI-CH6 do not need to be on the same straight line. Also, pilot signals for tracking control are recorded in each area, but it is assumed that they are recorded in a predetermined rotation (fl-f2→f3→f4) for each area, and there is no correlation between the areas. do not have.

In addition, the area indicated by CH1-CH3 is
Recording and reproduction are performed when the vehicle is traveling at a predetermined speed in the direction shown by arrow 7, and recording and reproduction is performed in the area indicated by CH2-CH2 when it is also traveling in the direction shown by arrow 9. Therefore, the fourth
As shown in the figure, the inclination of each track in the area indicated by CHI to CH3 and the inclination of each track in the area indicated by CH2 to CH2 are slightly different. However, regarding the difference in relative speed at this time, the difference in relative speed due to the running of the tape I is extremely small compared to the difference due to the rotation of the head 3.4, so it does not pose a problem.

FIG. 5 is a time chart of recording and reproduction of the tape recorder as described above. In FIG.
“High level Jl/(H)” and “low level (L)” at 0 seconds.
)” is a 30Hz square wave that repeats.Also, (b)
is a PG of opposite polarity to PG(a). Here, PG (a
) are H and P while the head 3 rotates from B to G in Figure 3.
G(b) is H while the head 4 rotates from B to G.
shall be.

Figure 5 (c) shows the data reading pulse obtained from PG (a), which corresponds to one field of the video signal (1/60 seconds).
This is for sampling the audio signal every other field in the period corresponding to the period corresponding to the period.

In FIG. 5(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. Figure 5(e) shows the data recording period H.
, which indicates the timing at which the recording data obtained by the above-described signal processing is recorded on the tape 1.

For example, if we follow the flow of the signal in time using Fig. 5, t
The data sampled during the period 1 to E3 (while head 3 is moving from B to G) is from t3 to t5 (when head 3 is moving from G to A)
Signal processing is performed at t5 to 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) during the period from t6 to t6, and recorded according to the signal shown in FIG. 5(h) during the period from t6 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 reading of data from the tape l by the head 3 is shown in FIG.
t6 to t7 (same for ti-t2) according to the signal shown in h)
t7 to t8 (
From t'2 to t3), signal processing opposite to that during recording is performed.

That is, error correction and the like are performed during this period, and a reproduced audio signal is output from 78 to t9 (t3 to t6) according to the signal shown in FIG. 5(j). Of course, the reproduction operation by the head 4 is performed with a phase difference of 180' from the above-mentioned operation, so that a continuous reproduction audio signal can be obtained.

Also, regarding other areas CH3 to CH6, PG (a)
Needless to say, it is sufficient to shift the phase 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.

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 it is an object of the present invention 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 reference oscillator 14 is divided by a frequency divider 15 to 1/m, and the phase is compared with a pulse whose frequency is down to 30 Hz. The drive circuit 1'6 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 1 are provided to run the tape 1 in both directions, and a motor for driving these capstans 17 and 18 is connected to a switch circuit 19. Further, FG 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 of the signal is divided into l/n by a frequency divider 24 to 30 Hz, and then supplied to a rear phase comparator 25. Here the frequency divider 24
The phase of the output and the output of the branch divider 25 are compared 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. The switch circuit 19°22 is set to the A side when the sequence control circuit 28 causes the tape to run in the forward direction (arrow 7).

When the tape is run in the opposite 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 a predetermined rotation (fl→f2-f3→f4) from signals having four different frequencies for each track.

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, l/N2, l/N3, 1/N4) are provided, and the outputs of these are sequentially sent to the switch circuit 37 in a predetermined rotation every 1760 seconds. .38, 39.40, and is further supplied to the switch circuit 51 in FIG. 6 via the switch circuit 101 and the terminal 50.

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 as shown in FIG. 5(a).
It is assumed that the phase of

Terminals 41a and 41b are both L during normal recording and playback.
This is the terminal to which a signal is supplied from the sequence control circuit 28, and at this time, AND gates 45a and 45b output L as is.

The output of the PG and frequency divider 44 is a logic gate group 46°47.
48.48 and according to this logic switch 37
．． 3B, turn on sequentially for 1/60 seconds at a rotation of 39.40. As a result, the terminal 50 sequentially receives f1→f.
The tracking pilot signal is supplied in a rotation of 2→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 the amplifier 53. It is supplied to the rotary head 3.4 via the R side terminal of the switch circuit 54 and the switch circuits 55, 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 near the end, reverse recording is automatically started, and when recording is continued, the sequence control circuit 28 generates the aforementioned pilot signal. A high level signal is supplied to the terminal 41a of the device for a predetermined period of time.

Then, during this period, the output of the AND gate 45a becomes high level only when PG is low level.

Therefore, the mute circuit 101 is operated via the OR gate 102 when the PG is at a low level, and the tracking pilot signals having the frequencies f2 and f4 are prohibited from being output from the terminal 50.

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, the sequence control circuit 28 supplies an H signal to the terminal 41b for a predetermined period of time, and the AND gate 45b outputs an H signal only when PG is H. Correspondingly, when PG is H, the mute circuit 101 operates and prohibits the tracking pilot signals having the frequencies fl and f3 from being output from the terminal 50.

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

During the period indicated by τ, the pilot signal having the frequencies f l and f3 is not recorded. After this period, the pilot signal is recorded superimposed on the audio signal as usual.

On the other hand, when the specified predetermined period immediately before the aforementioned reverse recording has passed, the sequence control circuit 28 causes the drive circuit 27 to
After stopping the tape running, the switch circuit 19.
22 and connects it to the B side, returns the tracking pilot signal to normal rotation, and also causes the channel designation circuit 58 to designate a predetermined channel.0 For example, if the area shown in CHI is being recorded. For example, the area shown in CH4 may be specified.

Next, the 0-rotation head 3.4 will explain the operation during playback.
The audio data signal and tracking pilot signal reproduced from
The signal is supplied to a CM audio circuit 30 and an LPF (low pass filter) 61. The PCM audio circuit 30 performs processing such as error correction and time axis expansion on the obtained data.
A reproduced audio signal is obtained at the aforementioned timing controlled by the recording/reproducing control circuit 57 and outputted from the terminal 62.

On the other hand, only a tracking pilot signal is obtained from the LPF 61 and guided to the 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 ATF 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 regenerated pilot signal for tracking is supplied to a terminal 70 via the LPF 6 l, while a pilot signal obtained from the generator 31 via the P-side terminal of the switch circuit 51 is supplied to a terminal 71. is supplied. These are multiplied by a multiplier 72, and a BPF (band pass filter) 73.3f separates the fH acid component.
BPF 74 that separates the H component, detection circuits 75 and 76, comparator 77, inverting amplifier 78, and switch circuit 79
The signal is supplied to a tracking error detection circuit consisting of: The switch circuit 79 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.

Terminal 83. A pulse indicating the timing at which the reproducing head traces approximately the center of the reproducing area is supplied from the recording/reproducing control circuit 57 described above, and the S/H 81 is operated by this pulse. In this way, the output of the S/H 81 is made into a tracking error signal, and is supplied to the drive circuit 27 via the P-side terminal of the switch circuit 26.

This section explains what happens when you try to play a rack.

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. BPF104-107 are respectively f1-f
These outputs are compared with a reference level 108 by comparators 109-112.

If an output is obtained from even one of these comparators 109 to 112, the OR gate 113 supplies an H output to the data input of the shift register 114.

The clock pulse of the shift register is passed through the PG to the delay device 126.
The edge detection circuit 115 detects the delayed signal. On the other hand, switch circuits 118-121 are provided to supply the 4-bit output of shift register 114 to sequence control circuit 28 via terminals 122-125. These switch circuits 118-12
1 is turned on when the OR signal (output from 117) of the delayed PG and its frequency divided by 1/2 by the 1/2 frequency divider is H.

Here, the output 114 of each bit of the shift register 114
A-114d indicates whether each of f1 to f4 was recorded in the 4-field period reproduced immediately before, and 114a is fl.

114b is that of f4, 114c is that of f3, and 114d is that of f2.

Therefore, when playing back the normal recorded part, terminals 122 to 12
5 are respectively H, H, H, and L when the specified period at the start of recording is being reproduced.

When reproducing a designated period immediately before H, L, and H reverse recording, signals H, L, H, and L are supplied to the sequence control circuit 28, respectively.

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

Further, immediately before reverse recording, the sequence control circuit 28 causes the drive circuit 27 to stop running the tape 1, 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.

By the way, the reason why we prohibited the recording of pilot signals every other track is that there is an advantage in that tracking can be performed even during the specified period.If you want to achieve even more accurate tracking, for example, write to the track shown in TRO in Figure 8. It is effective to make the signal of f4+3fH 1 tatami.

In the above embodiment, the change in the rotation of the tracking pilot signal is detected using each pilot signal component, but the 3fH component,
It can also be detected by using the fH acid component and also by using the tracking error signal.

In addition, in the above-mentioned embodiment, only the transition to a specified channel during playback and reverse playback has been described, but it is also possible to vary the length of the specified period or to create a recording prohibition pattern for multiple types of pilot signals. It is also possible to automatically specify the channel to be migrated by specifying this.

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 the drawing]

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. Figure shown. 4 is a diagram showing a recording trajectory on a 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. 6 is an embodiment of the present invention. FIG. 7 is a diagram showing a specific configuration example of the pilot signal generator in FIG. 6, and FIG. 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, 3.4 is a rotary head, 28 is a sequence control circuit, 30 is a PCM audio circuit, 31 is a pilot signal generator, 45a, 45b
is an AND gate, 52 is an adder, 57 is a recording/reproduction control circuit,
58 is a channel designation circuit, 63 is an ATF circuit, 101
is a mute circuit, 104 to 107 are each BPF, 113
is orgate, fl, f2. f3. f4 is the frequency of each tracking pilot signal. CHI-CH6 each indicate an audio signal recording area.

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 a plurality of types of pilot signals and information signals having different frequencies. A recording device for recording, wherein recording of a pilot signal of at least one type of pilot signal among the plurality of types of pilot signals in each area is prohibited for a specified predetermined period. Device. (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 a plurality of types of pilot signals having different frequencies are recorded in each track. , an apparatus for reproducing the information signal from each of the areas, wherein during recording, for each area, recording of at least one type of pilot signal of the plurality of types is prohibited in the area for a specified predetermined period; A recording/reproducing apparatus characterized in that during reproduction, the reproduction operation is changed by detecting the presence or absence of the one or more types of pilot signals.