JPS58211319A - Recording device of information signal - Google Patents

Abstract

PURPOSE:To ensure the recording with even track width, by avoiding the unstable reproduction of a pilot signal due to a transient, etc. caused by an instantaneous switch between the recording and reproducing systems and to ensuring the stable control for the height of a head. CONSTITUTION:A recording system circuit 1 produces an FM luminance signal Y and a low frequency converted chroma signal C, and a synthetic video signal V (Y+C) is applied to a rotary magnetic head H through an adder 2, a recording amplifier 3 and a rotary transformer 4. In a reproduction mode, the reproduction output of the head H is applied to a head amplifier 6 of a reproducing system circuit 5 through the transformer 4, and the output of the amplifier 6 is reproduced and demodulated. In a reproducing mode a switch 7 is closed with the timing of a gate pulse G1, and the pilot signal of the output of an oscillator of the 5th frequency is superposed on a recording signal through the adder 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information signal recording device in which the flat position of the recording head (directly placed in the trunk) is controlled and is equipped with two rotary air heads. This is carefully selected for use with Kotomo helical scan type bino table recorders.

In the field of helical scan type videotape recorders, a one-rotation head is attached to an electro-mechanical transducer such as a bimorph plate so that the head height can be controlled,
There are known devices equipped with a dynamic tracking head that performs tracking abstraction during playback. Tracking error detection methods include the Walprinter method, which synchronously detects the AMK tone component of the student video signal (FM wave) according to the direction of forced vibration of the head, and the Water Printer method, which synchronously detects the AMK tonal component of the student video signal (FM wave), and the built-in pilot signal with frequencies f1 to f4 to each trunk. Record it in
A pilot method is used that detects the crosstalk level of the pilot signal from the trunk inside the scanning trunk during playback and calls the difference between them a tracking error.

In the latter method, during HQ recording, a portion of the vertical blanking section of the trunk (for example, 1.5
Record the pilot of the fifth frequency 15 in the Mizuko section) and record the pilot of the fifth frequency 15
When recording the next trunk that will slow down, immediately after recording f5, detect and hold the crosstalk level of this pilot signal from the MiJ adjacent trunk, and do the same thing on the next track in the % history to instantly connect. A high-adjustment method is used in which the quotient position of one of the two rotary heads is fixed so that the hold values between the locks are equal. Using this method, the two rotary heads are at the same height and tracks of the same width are formed on both sides.

This method has the following problems.

(1) During recording, in the section where f5 is being played back, 10" is also recorded, so the playback signal is missing during playback.
The part is raw. For this reason, there are restrictions on the reproduction section of f5, such as making it outside the hesodos isotenchhals for switching between the two rotating heads during reproduction, and when distributing pitches (this
The reading may become slightly unstable.

(When recording 2j1, it instantly changes from 6 self-recording mode to playback mode at the revenge part of f5 (approximately ILI if it is a 1.5 Mizuko section)
In order to avoid the problem of unstable byronto playback caused by trans/end at the time of switching, a special device is applied to the recording/playback amplifier and the changeover switch. In view of the above-mentioned problems, it is an object of the present invention to make it possible to reproduce a pilot signal (f5) for a head station of 1lilJ without switching between recording and reproduction.

Embodiments of the present invention will be described below with reference to the prior art. FIG. 1 is a diagram of tracks on a magnetic chip 7', illustrating the above-mentioned conventional head alignment method. . In FIG. 1, the head (not shown) overlaps the trunk view, and the trunk '1'B is recorded δ in the direction of arrow S with both hands. Note that the magnetic tape can be run in the direction of arrow R.

Trunk 'l'B u) Up to point a, normal bidet No. 100 ■ is recorded % a % Up to b, pilot signal f
5 is superimposed on bidet No. 116 V and recorded on 6d. Note: This section is equal to the level difference between trunk 1'A and 'l''B.
An example is 1.5 horizontal intervals. When switching to the reproduction mode between b and C, the pilot signal 15 (crosstalk) already recorded in the previous recording trunk '1' is reproduced. This crosstalk level is controlled by the ^chika pie self board front of the head so that it is the same between the two heads. After point C, it enters the recording state and records the video information.
There is one more problem.

Next, FIG. 2 is a circuit diagram of No. 1 song of the drowsiness head section showing the principle of the present invention, in which (A) is the playback state and (B) is the i-recorded V.
, I'm not sure what to do. As shown in FIG. 2(A), a regenerative electromotive voltage vPB is obtained from the head terminal of the inductance L. During recording, a recording signal 1rec flows through the inductance L of the head, and an electromotive voltage (:Jtu"reCO) is generated at the head terminal. At this time, the crosstalk amount v'PB from the track is generated as a reproduction signal by the above-mentioned electromotive force. Pressure f is produced (J(1)Lj-reC>>V'FB) 6 jω
The voltage ratio between Lirec and VPB can be set at about 6U to 1 [JOdB, or in principle, it is impossible to separate the phase across the number of circuits by i=J.

Figure 6 shows ■Tit according to the present invention using the above-mentioned principle.
FIG. 2 is a block circuit diagram showing a narrow part of the recorded/regenerated yarn. l
FIG. 4 is a track pattern diagram and a time chart for explaining the operation of FIG. 6.

In Figure 6, when recording, FM is set at 6 self-recording circuit +11.
A luminance signal Y and a low frequency converted chroma signal C are formed 2L,
These composite bifocal information v (=y+C> is added to the adder (2
1 - The signal is applied to the rotating magnetic head H via the recording amplifier (3) and the rotary transformer (4). Also, during playback, the playback output of head H passes through the day-tally transformer (4) and is played back,
), its output will fall.

During recording, the switch (force) is closed at the timing of the gate pulse G1 in FIG. As shown in the figure, the pilot signal I5 or the R3C recording signal is recorded at a fixed position within the vertical blanking section of the valley track over, for example, 1.5 horizontal sections.

Immediately after recording the pilot signal f5, Q, the crosstalk component of f5 is detected from the previously recorded 'Lus track. At this time, there is no switching from the recording mode to the playback mode as in the past, and the line for the single recording signal to the head H is connected to the input end of the rotary transformer (4). The connected 15 reproducing circuit (9) becomes operational. That is, the gate pulse G2 (same as gate pulse G1, pulse iJ) shown in FIG. 4 is the fs naturalization raw circuit 9).
is applied to the reproducing amplifier Uυ, and the coil L is turned on.

As a result, the crosstalk component VPB of the internal recording If j*Llrec +'S layered at the output end of the head 11 passes through the rotary transformer (4) to the bandpass of the f5 reproducing circuit (9). filter u0).

Here, the f5 component is extracted and nJki Niu Ang ufJ-
In the Of5 output circuit 21, the f5 component is detected and its envelope level is detected and further held as a sample.This sample bold' The 1st pressure is compared with the f5 detection level in the next trunk, and adjustment is made using the bimorph plate of either the A heradle or the B head 1m so that the f5 detection levels of adjacent tracks are equal to each other.As a result, , trunks of equal 1'' are formed alternately by the A and B heads.

H2S diagram shows high lot signal f5 and recording current (luminance signal)
It is a frequency spectrum graph that enjoys the relationship with the low frequency component Y of . The recording position of I5 is within the vertical flanking section, and as shown in FIG. dominant. There is no chroma component, so set I5 to fu/2
Choose an odd number multiple of %Q cylindrical bandpass filter l1l
With JI (or low-pass filter) or similar detection method, Jl, 6Ll is better than Llrec.
~ILILldB low f5 crosstalk component can be extracted.

A comb filter or a PLL1 path can also be used instead of the bandpass filter tiO+.

Next, FIG. 6 is a trunk pattern diagram showing another embodiment of the present invention. In this embodiment, the pilot signal 15 is not used, but is used for the 1. Since Pilot No. 16 f1 to f4 are recorded, the crosstalk components of these Pilot No. 100 from the fitted trunk are detected to simplify the head design. For example, as shown in FIG.
The video signal V+pilot issue [sf was recorded]
Then, in the next trunk '1'B, ■+(+ is recorded, and I5 of the adjacent trunk is played back, and the head height is controlled based on the playback level l. It is possible to rub the track tjj evenly over the entire area.
It may be limited to the rank section.

Next, FIG. 7 is a pattern diagram of a tonnoku that shows an example of application of the actual performance example shown in FIG. 6. In addition to the inserts that record the first part of the new bib in the fixed section of the teno that has already been self-recorded, r is on the track of the insert part, or on the cut-in point and the sonon-to-out point. It must be aligned with the track pattern that you have already recorded. For this reason, in the application example of Fig. 7,
In the middle part of ゛1~'i'n, hold the trunk ``1゛2~'l'n-+ f 4 change/, 1 match, insert the self dance (-j while & already Reproducing the recorded pilot signals f1-14
Yes, I have recorded the ``Soundbite No. 1'' by checking the trace in a state that is consistent with the recorded tone. Both 1141 of R Yu recording track as reproduction pilot scar number
Using the crosstalk component from the track 1 located at 1, perform a toshizo kink servo with a bimorph radical so that the levels of this L and others are equal. It is possible to perform insert recording. Note that the pilot signal may be generated only in the vertical blanking section.

The present invention records the pilot signal from the instantaneous contact point while recording the above-mentioned μ mouth (video signal).
What happened 41. The position of the recording head's torque is controlled based on this.

Side part'C$: According to the invention, IL does not require switching the head to playback mode at once during recording as in the past, and n1
While recording, the high-lot signal is distorted, so the recording system/
When switching the regenerated yarn instantaneously, the tone etc. (This means that the regeneration of the pilot No. 15 will not be interrupted by the small pods, and the head converter will be controlled stably and the B1 recording will be performed with a uniform track + i. Kotoka Kokono J Noh (Konaru. Also, the recording 1WL is played in the live section of the track with L ruri.

Since there is no possibility that a part of the reproduced signal is lost during reproduction, and therefore there is no adverse effect on the 0 raw screen, the arashi-tatami position of the high lot signal f5 can be freely selected within the vertical plank section. It is also possible to record high lot signals over the entire track.

[Brief explanation of drawings]

Figure 1 shows a conventionally known 4t head ft4';a.
Matching method 73: Diagram of the trunk on the treadmill for explanation; Fig. 2 shows the principle of the present invention; Fig. 6 is a circuit diagram of equal excitation of the magnetic head; A block circuit diagram showing the main parts of 1゛rin record/8 raw silk. Fig. 4 is a trunk pattern diagram and time chart for explaining the operation of Fig. 6, Fig. 5 is a frequency spectrum club showing the frequency relationship between the self-recorded video I and the high lot signal f5, and Fig. 6 is 7 is a trunk pattern edge diagram showing another embodiment of the present invention, and FIG. 7 is a trunk pattern pattern showing an application example of the embodiment of FIG. 6. In addition, in the symbols used in the drawings. (1)・・・・・・・・・Recording thread circuit (2)・・・
・・・・・・・・・Adder (3)・・・・・・・・・
・・・d Self-recorded Ang (4)・・・・・・・・・Rotary transformer (8)・・・・・・・・・・・・fs
AA oscillator (9)...... fs14 raw circuit u (1)...Band pass filter Uυ... ...Nyu amplifier u4...
・・・・・・River...15 detection circuit 1'' ・・・・・・・・・
...It is a hunting head. Agent: Ueya: Yoshi Tsune, Shun Ura, Kai Figure 1

Claims (1)

[Claims] When a recording head is used to sequentially record information signals on a recording track with a predetermined track spacing, a pilot signal is superimposed and recorded on a predetermined position of the recording track, and the above recording is performed. (At this point, the pilot signal is emitted while performing the recording operation, and the recording head is directly placed in the track width direction based on the read pilot signal.) Recording device for 90 minutes signal.