JPS60101749A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent mutual disturbance and to reduce an area for track control by dividing the area of recording tracks into an area where main signals such as a PCM signal and a video signal are recorded and an area where a tracking control signal is recorded. CONSTITUTION:A rotary magnetic head 1 records a signal of frequency f1, a head 2 records a pilot signal of frequency f2, and a PCM signal is recorded between them. Reproduced signals appear at regenerative amplifiers 26 and 27 only when the heads 1 and 2 contact a tape 4. The output of a switch 28 is applied to a waveform equalizing circuit 30 and a tracking control circuit 29. The reproduced signal after its phase and amplitude are compensated by a waveform equalizing circuit 30 is shaped by a comparator 31 into a digital signal and deinterleaved by a processing circuit 32A to detect an error, and the output is sent to a D/A converter 32B to output an analog signal. Signals of frequency at which azimuth loss effect is not obtained are recorded at alternate tracks to narrow down the recording area of the pilot signal, so that stable tracking control is performed.

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to a helical scan type S-type recording and reproducing device having a rotating head, and is particularly applicable to a video tape recorder and a P-type recording/reproducing device.
The present invention relates to a recording and reproducing arrangement suitable for tracking control of a CM recorder. [Background of the Invention] Rotating nine-pin magnetic one-pin recording and reproducing apparatuses are popular as consumer devices such as video tape recorders and audio PCM recorders. This rotary head type magnetic recording/reproducing apparatus records and reproduces information by forming oblique tracks on a magnetic tape, which is a recording medium. In addition, in order to increase the recording density, guard bands are not provided between adjacent tracks and gaps, and crosstalk from adjacent tracks during recording is reduced to 1-pi recording and playback, and the azimuth angle of C is made different for adjacent tracks m1. Reduce by azimuth loss. In such a rotary head type magnetic recording and reproducing apparatus, it is necessary for the reproducing device to accurately trace the tracks recorded on the magnetic tape, and the tracking control that controls this plays an important role. Tracking control of a conventional video tape recorder is performed using a dedicated track for recording control signals. Although this method does not interfere with the image signal that is the main letter, it requires a dedicated area on the head and magnetic tape for tracking control, and is different from the actual track where the main letter is recorded. Therefore, there is a hardware and performance drawback in that the tracking performance is not suitable for high-density recording and reproduction. To improve the stiffness, control signal recording tracker 9
As a conventional method that does not require
As in Publication No. 1 and Japanese Unexamined Patent Publication No. 54-3507, the main (No. 8) is frequency-multiplexed and recorded so that the pilot signals are spatially arranged, and during playback, the pilot signals from adjacent tracks,
There is a method of obtaining a tracking error signal by using the cross daughter of the V and V signals. However, in this method, the pyro signal is frequency-multiplexed on the main signal pcM signal and the image signal.
．． Since the I/O signal is recorded, the pilot signal inherently interferes with the main signal, and in order to reduce this effect, the recording level of the pilot signal must be made sufficiently lower than the level of the main signal. Therefore, there is a drawback that the S/N ratio of the reproduced pilot signal is insufficient and stable tracking control cannot be performed. In addition, two rotating magnetic fields A and B with different azimuth angles are
In the case of recording and reproducing in the above-mentioned document, the spatial arrangement pattern of the pilot signal recorded in the A field and the spatial arrangement pattern recorded in the B field are the same, so that the 9th field is allocated to the A field. Even in the state where the track B is reproduced by 9 degrees, the main signal, which is the stable point of tracking control, may not be reproduced. Therefore, such a tiger,
The problem is that the pilot signal itself does not have the function of identifying the signal, and it is necessary to provide another means. [Object of the Invention] An object of the present invention is to reduce the area on the magnetic fjt tape where the tracking control pyro and vto signals are recorded without interfering with the main signals, such as PCM digital signals and image signals. Another object of the present invention is to provide a rotary head type magnetic recording and reproducing apparatus capable of performing track identification during two-head azimuth recording and reproducing. [Summary of the Invention] In the rotating head type magnetic recording and reproducing apparatus according to the present invention, the area of the recording track 9 is divided into an area where the main signal of the PCM Shintan or jtll image signal is recorded and a control for tracking control. By dividing the signal into areas where signals are recorded and preventing mutual interference, the control signal for tracking control is made of pilot signals of frequencies fI and fz that have no effect of azimuth loss for each y. This is because the area for tracking and y-king control is reduced, and the area for tracking and y-king is made smaller, and the area for tracking and y-king can be identified. [Embodiment of the Invention] Hereinafter, as an embodiment of the present invention, two different azimuth angles will be described.
A PCM recorder using nine rotary magnets will be explained. FIG. 1 shows a configuration diagram of a PCM recorder according to the present invention. 1 and 2 correspond to rotating magnetic fields for recording and reproducing, C and 6 correspond to rotary transformers, signals from the rotating magnetic field 1 correspond to a signal line 6, and correspondence from the rotating magnetic head 2 correspond to a signal line 7. Reference numeral 16 indicates a motor for rotating the rotating magnet 9 and 1.2, 17 a rotation speed detector for detecting the rotation speed of the motor, and 20 a frequency signal corresponding to the rotation speed at the output of the rotation speed detector 17. is obtained. 18 is a rotation speed control circuit for the motor 16; 19 is an output of the rotation speed control circuit 18 to drive the motor 16; 4 is a magnetic tape as a recording medium, 5 is a recording track recorded on the magnetic tape 4, 21 is a motor for feeding the magnetic tape, 22 is a rotation speed detector of the motor 21, and 23 is a rotation The motor 21 is driven by the output of the number detector 22, 25 is a rotation speed control circuit of the motor 21, and 24 is the output of the rotation speed control circuit 25. 8.9 is 8R & 9R1 with switch to switch between recording and playback.
111 is recording and BP, and 9P side is playback. 15L and 15R are analog signal input terminals, 14A is an A/D converter that converts analog signals into digital signals, 1
4BFi [recording thread signal processing circuit for adding detection and correction codes, synchronization signals, etc.; 12 and 16 are tigers; IQ, 11 is a changeover switch, and 9A is a recording amplifier. 26 and 27 are playback amplifiers, 28 is a changeover switch, 29 is a tracking control path, 30 is a waveform equalization circuit, and 51 is a data turtle 1#
*Comparator for determining OL; 32A is a reproduction system signal processing circuit for detecting and correcting errors in reproduced digital correspondence; 62B is a D/A converter for converting digital authenticity into analog signal; 53L , 53R are analog signal output terminals. In addition, 34 is the cloak 1. which supplies the heno cloak to each part. 35 and 38 are reproduction yarns, reference clocks for the recording system signal processing circuits 32A and 14B, and 36 are clocks with a duty ratio of 50 which is the rotational frequency of the motor 16 and the wave number of 1is+-. Rotation speed control circuit 1B
, 25,) is added to the Love King control circuit 29 and controls the switch 213.11. 37 is a voltage regulator for controlling the switch 10, switch IQ, 11. ) 8 is the control black 5. When Ri is -1# level, 1oA, 11At28
10B when the A side is at OI level. Select the 11B and 28B sides. The operation of FIG. 1 during recording will be explained using the timing chart of FIG. 2. The numbers on the left of No. 21 correspond to the symbols of each part in FIG. The analog signals of the two left and right channels are input terminal 15L,
15R, is converted into a digital signal by an A/D converter 14A, and is applied to a recording system signal processing circuit 14B. In the recording system signal processing circuit 14B, a code for error detection and correction is added to the digital signal based on the clock 38 generated by the clock generation circuit 34, interleaving is performed, and a synchronization signal is added. The recording system signal processing circuit 14B further stores stiff data in a RAM (write/readable memory), and intermittently outputs the PCM data in synchronization with the clock S6 of the cloak generation circuit 34, as shown by 3tS and IDB in FIG. Output. On the other hand, the generator 12゜16 that generates the pilot signal for the tracking control is shown in FIGS. 11A and 11.
As shown by B and IQA, the switch 11 causes the frequency ft to appear alternately in synchronization with the clock 56. In the switch 9 and 10, in order to add the pyro and g signals 10A before and after the intermittent PCM data 10B, switching is controlled by the cro and ri 37 of the cro 9 and ri generation circuit 34, and the signal shown in FIG. 2 10 is obtained. . This Iβ signal is added to the rotary magnetism for recording and reproducing via the recording amplifier 9A, switch and switch 8°9, and is added to the signals 1 and 2 and recorded on the magnetic tape 4. At this time, the motor 16 adjusts the phase of the output 20 of the rotation speed detector 17 and the clock 36 by the rotation speed detector 17 and the rotation speed control circuit 18 so that the rotation speed is the same as the frequency of the clock 36. # is done. Therefore, as shown in FIG. 2, when the rotating magnetic field 1 and 2 are black and V 36 is at the 11# level, V 1 contacts the magnetic tape 4 to perform recording, and the cloak 36 is closed. When the magnetic tape reaches the 0 level, the dot 2 contacts the magnetic tape 4 to perform recording. Further, the magnetic tape 4 is sequentially fed by a tape feeding motor 21.
A recording track 95 is formed on the top. FIG. 3 shows the shape of the recording track 5 recorded in this manner on the tape. In Fig. 6, TP is the track width of 9 inches, Hw is the rotating magnetic field, head width of tracks 1 and 2, θ is the track angle from the tape edge, α is the diagonal track, and the adjacent track generated by forming the track. The relationship is α=Tp/Emθ. When the rotating magnet head 1 contacts the magnetic tape 4, it first records the pilot signal frequency f1, and then
Write the CM data and finally record #fI again, ν
form a ridge. Next, when the rotating magnetic head 2 comes into contact with the magnetic tape 4, it records the pilot signal frequency f2, and the PCM
Write data, re-record #f2, and form another tiger 9. Therefore, as shown in FIG. 3, the frequency changes from fl to fz for each track on which the birotation signal is written as the tape ages. The track shape shown in FIG. 3 was obtained by the above-mentioned operation of the recording thread, and the operation of the regenerating thread for correctly tracing the tracks and reproducing authenticity will be described below. In Fig. 1, the switch 8.9 is connected to the BP and 9P sides during playback, and the signal of 9D1 to the rotary magnetic head is applied to the playback amplifier 27, and the signal of the rotary magnetic head 2 is applied to the 1 playback 7 amplifier 26. . The rotary buttons 1 and 2 are rotated by the motor 16 at the same frequency as the cloak 36 as during recording. Therefore, a reproduction signal appears in the reproduction amplifiers 26 and 27 only while the rotating magnetic envelopes 1 and 2 are alternately in contact with the magnetic tape 4. The switch 28 switches the mutually reproduced signals by the clove 36 to form a single reproduced letter. Sui 1. The output of circuit 28 is applied to a waveform equalization circuit 30 and a tracking control circuit 29. The reproduced signal whose phase amplitude on the transmission path has been compensated by the waveform equalization circuit 30 is shaped into a digital signal by the comparator 31, and then applied to the reproduced yarn signal processing circuit 52AJ. The reproduction system signal processing circuit 32A takes in the input digital signal, dinterleaves it, performs error detection and correction, adds data to the L/A converter 32B, and outputs an analog letter to output terminals 33L and 33Ri. In order to obtain the reproduced signal in this way, the rotating magnetic head 1
*2 It is necessary to trace the track correctly, and the tracking control circuit 29 works to control this. Switch 2BF) output (No. 1 is added to the tracking control circuit 29, and the tracking error signal is detected using the frequency fx-f2 signal of the It is added to the control circuit 25, and by changing the rotation speed of the motor 21 in accordance with the tracking and king error signals, the feeding speed of the magnetic tape 4 is changed, and the operation is performed so that there is no tracking error. The king control circuit 29 will be explained in detail. Fig. 4 shows a configuration diagram of the tiger and V king control circuit 29, and Fig. 5 shows a timing chart of each part in Fig. 4.
In the figure, 40 is the input terminal of the signal from the 11th switch 2B;
41 and 42 are band-pass filters with frequencies aft and fl; 43.44 are envelope detection circuits that output the envelope IF of the signal; 45.46 are switches controlled by the input terminal 56;
circuit, 48 is a 2-bit shift register, 4BIQ,
481Q is the positive/negative output of the first bit of the shift register 48, and 482Q. 482Q is the positive and negative output of the 2nd bit of shift register 4B, 50 and 51 are AND circuits, 49 is the clock and V input terminal of register 48, 56 is the input terminal of clock 36 in Fig. 2, and 52 and 55 are sample and hold terminals. 54 is an analog reduction circuit, and 55 is a tracking error signal output terminal. Further, the symbols on the left side of FIG. 5 correspond to the symbols of each part of the circuit in FIG. 4, and are used to equalize the output reliability of each circuit. The operation of the circuit shown in FIG. 4 will be explained below. The signal applied to the input terminal 40 in FIG. 14 is transferred from the recording track shape shown in FIG. Since there is no pilot signal f1 from the adjacent truck on the left, the pilot signal f1 from the adjacent truck on the left is detected as a cuff talk, then the pilot signal f1 from the home truck appears, followed by the pilot signal f2 from the adjacent truck on the right. is detected as crosstalk. After the rotating magnetic head 1 detects the PCM data, it again detects the birotation signal f? from the left adjacent track. , is detected as a pilot signal f & crosstalk from the adjacent toradak on the right side. After the rotating magnetic head 1 traces, the rotating magnetic head 2 detects a signal in the same way as the rotating magnetic head 1, but the crosstalk of the pilot signal from the adjacent track 9 becomes fs. Therefore, the output of the letters 41 and 42 in FIG.
Output 41 of pilot signal frequency f2 due to crosstalk from adjacent tracks before and after the output of 42 which is the output of
appears. In addition, in the reproduction of the rotating magnetic helad 2, the pilot signal frequency tBt, the birot signal frequency f due to crosstalk from adjacent tracks before and after the output 41 of *ft.
The output 42 of t appears. Further, as shown in FIG. 3, the level of the rotary signal that appears due to crosstalk is high in the first half and low in the second half when the rotating magnetic field 9 and 1 shifts toward the left adjacent track direction. Conversely, if you sit in the direction of the adjacent track on the right side, the first half will have a lower level and the second half will have a higher level. The outputs of the bandpass filters 41 and 42 are applied to envelope detection circuits 43 and 44, and
, 44. envelope detection circuit 43,
The output of 44 is switched by a clock applied to switches 45 and 46 and a clock applied to an input terminal 56 as shown in FIG. The output of the switch 45 is as shown in FIG. 5. When the input terminal 56 is at 11 level, the output of the envelope detection circuit 43 is selected, and when the level is 11 level, the output of the envelope detection circuit 44 is selected. do. Therefore, the output of the switch 45 is the envelope of the pyro and vto signals obtained by the crosstalk from the adjacent tiger and vto. Since the selection of switch 46 is opposite to that of switch 45, the envelope of the pilot signal of the home track cannot be obtained. By adding it to the +p circuit 47, the waveform shown in FIG. 5 47 is obtained. The output of the clipper circuit 47 is added to the shift register 48 as data. A clock input terminal 49 of the shift register 48 receives a higher frequency than the output pulse of the clipper circuit 47. A rising edge detection signal of the output pulse of the AND circuit 47 is outputted to the output of the AND circuit 50. The AND circuit 51 outputs a falling edge detection signal of the output pulse of the circuit 47.
The pulse outputs of 0 and 51 are sent to a sample hold circuit 55,
52 sample and hold pulses are added, and the output signals of the switch 45 are held at respective timings. These timings are 45, 50, and 51 in FIG. 2 holds the level corresponding to the amount shifted to the left adjacent track. In addition, the sample and hold circuit 52, which samples and holds the output pulse of the AND circuit 51, samples and holds the second half of the pilot signal of the crosstalk from the adjacent track, that is, the amount by which the rotating tracks 1 and 2 are shifted to the right adjacent track. Hold the corresponding level. Therefore, in the analog subtraction circuit 54, FIG. As shown in , the Toller/Gimme error signal output 55 obtained by subtracting the outputs of the sampling and hold circuits 52 and 55 is outputted to the adjacent Toller/Gimme error signal output 55 on the right side when the voltage is positive, and on the left side when the voltage is negative.
・It is a signal that indicates how much rotation in the evening direction & l air pressure 1.2 is the first. This toe 59 hong error signal 5
5 can be used to control the rotational speed of the tape feeding motor 21 shown in FIG. 1, and the rotating magnetic head 1.2 can be traced more accurately. FIG. 6 shows a configuration diagram of a tracking control g1 circuit of the present invention which detects the h-fz level using a converter method. K.E.
In Figure 6, 60 and 61 are local oscillators, 62 is a multiplier circuit for frequency conversion, and 66° and 64 are fizzyfa+
Regarding the other symbols in the 2/a frequency bandpass filter, the same symbols as in FIG. 4 have the same functions. Pilot signal frequency f1. It is assumed that fz has a relationship of ft>fz. The values of the frequencies f and t of the local oscillator 60 and the frequency f- of the local oscillator 61 are ftt=2fIf*=fI+f&, ftl-2f as shown in FIG.
2-fl=f*-fa. The signal applied to the input terminal 40 is the pilot frequency of the home truck is fh, and the pilot frequency of the adjacent truck is fz.
At this time, the local oscillator 60 is selected by the switch 45 and the frequencies f and t are applied to the multiplier circuit 62. Therefore, the pilot signal frequency ft of the home truck is (f*Lf+)=fa
appears at the output of the bandpass filter 63, and the pyrotron frequency f2 due to crosstalk is (ftt
fz)=2fa, which can be seen in the output of the Handhus filter 64. Also, when the pilot frequency due to the 12% crosstalk of the home track is fl, the local oscillator 61 is selected by the switch 45 and the frequency fμ raised to the power 3M is added to the 101 path 62. Therefore, the pyro, Vt message frequency f2 of the home truck is CfzLft
>=f, the pilot signal frequency f+ due to crosstalk appears in the bandpass filters 66 and 64 as (fzth)=2faJ-, respectively. That is, by switching the local oscillations 66o and 61, the bandpass filter 6! The level of the pilot signal from the home truck appears in I, and the level of the pilot signal from the home truck appears in the bandpass filter 64 due to the crosstalk from the adjacent truck. Therefore, similarly to FIG. 4, these 11 levels can be detected and tracking error information can be obtained. The operation of the above-mentioned tiger/king control circuit is as follows: At the rise of the level of the pilot message of the home pilot, the crosstalk pyro from the adjacent tiger on the left side,... +-
＜=a level detected, home track pyro,, (
When the level falls to N%, the pilot reliability level of the crosstalk from the adjacent truck on the right side is detected. Therefore, if the area for recording the pyro, r-ig' valve is 1 from Fig. 3 above α, then the area adjacent to the left and right depending on the size of the & recording area is It is possible to detect a pilot level of crosstalk of 4G, and the recording area is small. In addition, when recording and reproducing using two rotating magnetic heads with different azimuth angles, the red error is caused by the difference between the rotational magnetic field and the magnetic field during recording, as is clear from Figures 2 and 6 of the above embodiment. 1 records the Bayrot transmitter frequency f1, and the rotating magnetic field 2 records the Bayrot transmitter frequency f2.
is recorded, and during playback, trace the pyro, I and signal frequency fs from Figure 5 to the rotating magnetic attack.
The heave 9 that traces f2 operates to make it a rotating magnetic heave 2. Therefore, tracking can be identified and stable tracking control can be performed. In the embodiments of the present invention, the rotary heave type T&L recording and reproducing apparatus for recording and reproducing PCM digital signals has been described above.
The converter 14A and the recording system signal processing circuit 14B become a video signal modulation circuit, and the waveform equalization circuit 30 and the comparator 31
It is clear that the regenerated yarn signal processing circuit 32A%D/A converter 52B serves as a demodulation circuit for car video correspondence, and operates in the same way as in the case of PCM digital signals. In addition, in the embodiment of the present invention, the birotation signal is input at the beginning and end of the tiger call, but by controlling the output timing of the recording system signal processing circuit 1413 and the switching timing of the switch 10, a plurality of birot signals are transmitted on the track. It is possible to insert the fourth pilot signal in this case as well.
It is clear that the tiger and V kink control circuits indicated by - operate. [Effects of the Invention] According to 4 of the present invention, e, the area of the track is used as an area for recording PCM data and the main confidence of the idn concurrent communication μ, and a pyro-rid confidence for detecting the The recording area for the pilot signal can be narrowed by dividing the recording area into two areas, and by alternating the 2 frequencies 1, which do not have the same loss effect, every 1 hour for the frequency of the high love letter. This has the effect of making it possible to perform rotation with no interference to No. 145, stable tracking control with 01 capability of Travuk identification, and the ability to use a Doka-type magnetic recording device. Figure 1 is a block diagram of the rotary head type magnetic recording and reproducing equipment of the present invention, and Figure 2 is a diagram showing the configuration of the rotary head type magnetic recording and reproducing apparatus of the present invention during recording. 3 is a timing chart showing the signal shape on the magnetic tape recorded by the rotary head type magnetic recording and reproducing device of the present invention; FIG. FIG. 5 is a timing diagram showing the reliability of each part in FIG. 4, FIG.
It is a figure which shows the spectrum of the local oscillators 60 and 61 of a figure. 1.2... Rotating magnet head, 16, 21... Motor, 18, 25... Motor rotation speed control circuit, 12, 13...
... Bayroth confidence oscillator, 29 ... Tiger 9 Ging 1
lil+@circuit, 41.42... Bandpass, filter, 45, 44... Envelope detection circuit, 47.
... Cleaver circuit, 52, 53... Sample hold circuit, 60.61.
...Local oscillator, 62...Next 6 circuits. Fig. 2 Fig. 4 ￥ Teguchi Fig. 2 11- Procedural amendment (饅) Indication of the case 1981 Patent Application No. 20'? Name of Og No. 6 invention changed to 0 - Sodota-style E-discussion board member and Hiroshi Mio device corrector 4 Rumors and Patent applicant name in Section 1 + 5101 Stock Company 1 Hitachi Ltd. Agent residence 1lx1 Chiyoda-ku, Tokyo Marunouchi-chome 5-1 Stock Co., Ltd. 1
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Claims (1)

[Claims] In a magnetic recording and reproducing device that has at least two rotating magnetic heads and records and reproduces data by forming tracks on a recording medium, one track records Pyro S71-correspondence and images or PCM digital signals in a time-sharing manner. a means of recording the
The frequency of the pyro and tortoise letters is h and f for each travku.
t(fs'=f'i'), which generates a recording signal, records the recording signal on a recording medium, and reproduces the pilot signal frequency from the recording medium by a rotating magnetic head. means for detecting the level of f+-fv; and the pyro... signal frequency f1. From the level detection means of the fx, there is provided a means for detecting a level due to a crosstalk component from an adjacent track or a V, and tracking control is performed by an output signal of the biological membrane that detects the level due to the crosstalk component.・Do method magnetic recording and reproducing equipment.