JPH02174487A - Video signal recorder - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution by providing a recording processing circuit in common to each recording head section and applying servo control making a direction of color rotation correspondent with a recording head of each recording head section. CONSTITUTION:A recording processing circuit 12 obtains a luminance FM signal and a low frequency color signal from a video signal inputted to a terminal 10. A frame servo circuit 14 outputs a color rotation control signal and a head drive frame servo signal synchronously with each other so that a direction of color rotation in a head section and the processing circuit 12 in each recording head sections 16, 18, 20... is in a prescribed relation. Even when plural deck heads are provided, the processing circuit 12 is provided in common, and frame servo to make the head drive of each deck corresponding to the color rotation is applied by the frame servo circuit 14. Thus, lots of video tapes are mass-produced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video signal recording device such as a video tape recorder, and particularly to recording of low frequency converted video signals on multiple recording media. This invention relates to a video signal recording device that simultaneously performs video signal recording.

[Prior Art] In a video recorder for consumer use (111), in order to achieve good color reproduction due to the recording band of the video tape, the video signal is converted to a low-carrier FM signal before being recorded on the video tape. Recording is now done on tape.

For example, as shown in FIG.
Regarding the luminance signal (see figure fB) contained in the luminance signal (see figure fB), the low frequency carrier wave is FM-modulated by the luminance signal (see figure (C)), while the chrominance signal (see figure fB) ) is converted to a low frequency converted color signal (see the same figure) of a frequency band lower than the FM band.Then, the low carrier FM signal and the low frequency converted color signal are superimposed. Then, a low frequency video signal (see (F) in the same figure) is recorded on a videotape.

In recording such low-frequency video signals, azimuth recording is performed because it is necessary to perform high-density recording to prevent crosstalk from occurring on the video tape. Luminance FM, which is a high frequency with respect to a low frequency color signal
Almost no crosstalk occurs in the signal due to the azimuth effect, but the lower the frequency, the less the azimuth effect becomes, and crosstalk becomes a problem for low-frequency color signals.

Therefore, a recording method using color rotation processing is adopted. Note that the so-called VH5 system employs a phase shift system (hereinafter referred to as the RP system), and the so-called β system employs a phase inversion system (FI system).

Of these, the PS method will be explained with reference to FIG. 6. In a certain track #l on a videotape, the color signal phase is advanced by 90 degrees every LH (horizontal scanning period), and then in the next track In #2, the signal is recorded by delaying the color signal phase by 90 degrees for each IH (horizontal scanning period) (see the arrow in the figure). During playback, the color signal phase is returned and the LH delay is performed. When combined with the reproduced signal, the crosstalk component is canceled.

By the way, some video signal recording apparatuses have a plurality of decks as shown in FIG.

It is used when so-called dubbing is performed to obtain a plurality of recording tapes. In the figure, a recording device 150 has deck sections 152, 154, and 156, each of which can independently record signals on a videotape, and a common circuit section 158 is provided next to these deck sections. It is being This common circuit section 158 includes a deck section 152.1.
This function provides operation instructions and signal level display for 54.156.

The main part of the signal recording circuit in such a recording apparatus having a plurality of deck sections has conventionally been constructed as shown in FIG. In the figure, a plurality of decks 160.・・・
...++, 162.164 has the recording head section 1
66 and a recording processing circuit 168 are provided, respectively. Of these, the recording head section 166 is a mainly mechanical component that records a video signal converted into a low frequency carrier wave FM signal onto a video tape. Furthermore, the recording processing circuit 1611 is a circuit for obtaining a video signal converted from a video signal into a low frequency carrier FM signal, as described above.

In this manner, in the conventional video signal recording apparatus, a recording processing circuit 168 is provided for each deck.

This is because the direction of the color location described above is determined in each deck.

That is, the head that records the low frequency converted color signal of the first color rotation and the head that records the low frequency converted color signal of the other second color rotation are determined in advance. Note that there is a probability of 50% as to which head will record the video signal of each field.

Therefore, the relationship with the head is taken into consideration when determining the direction (advance or lag) of the color rotation of the color signal in a certain track, and the rotation pulse of the drum that indicates this relationship causes the color rotation to be It is determined.

CJ! However, as described above, if a recording processing circuit is provided for each deck to perform color rotation, the circuit configuration becomes difficult when a large number of decks are used at the same time. This becomes complicated and undesirable in terms of cost.

The present invention has been made in view of this point.

It is an object of the present invention to provide a video signal recording device which is suitable for cases where a large number of decks are used simultaneously, has a simplified circuit configuration, and is advantageous in terms of cost.

[Means for Solving the Problems] The present invention provides a method that uses a large number of video signals, including a luminance FM signal obtained by converting the frequency of a luminance signal and a low-frequency color signal obtained by performing color rotation processing on the color signal. In a video signal recording device that simultaneously records data on a recording medium using a large number of recording heads, the apparatus further comprises a signal recording processing means that generates each of the luminance FM signal and the low-frequency color signal based on an externally inputted video signal. , is provided in common in each recording head section, and is characterized by: servo control means for making the direction of color rotation of the color signal in this signal recording processing means correspond to the recording head in each recording head section. .

[Function] According to the present invention, the signal recording processing means for converting the video signal into a luminance FM signal and a low-frequency color signal is provided in common to a large number of recording head sections that record signals on a recording medium. The signals to be recorded are supplied from one signal recording processing means to a large number of recording head sections.

The correspondence relationship between the direction of color rotation of the color signal, which is reversed for each field, and the print head of each print head unit is controlled by a servo control means, and is maintained in a constant relationship. That is, the recording head that records the signal of each field is always the same, and the signal of color rotation in a certain direction is always recorded on the recording medium by the same recording head.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings. First, the basic configuration of the present invention will be explained with reference to FIG.

In the figure, terminal 1 to which a video signal is input from the outside
0 are connected to the input sides of the recording processing circuit 12 and the frame servo circuit 14, respectively.

The output sides of the recording processing circuit 12 and the frame servo circuit 14 are connected to the input terminals of the recording head units 16, 18, 20, respectively, each including a recording amplifier. ing.

Of these, the recording processing circuit 12 is connected manually to the terminal lO.
This is to obtain the above-mentioned luminance FM signal and low-frequency color signal from the video signal. Further, in the frame servo circuit 14, each recording head section 16. 18.20
- Head and recording processing circuit 12 in...
This is for outputting a control signal for color rotation and a frame servo signal for driving the head in synchronization so that the direction of color rotation in is in a predetermined relationship.

As described above, according to the present invention, even if there are a plurality of decks, the recording processing circuit 12 is provided in common to them, and is not provided for each deck.Instead, the recording processing circuit 12 is provided for each deck by the frame servo circuit A frame servo is applied to match the deck head drive and color rotation.

Next, an embodiment of the present invention will be described with reference to FIG. In the figure, the terminal IO is connected to the input terminals of a YC separation circuit 22 and a synchronous separation circuit 24, respectively. Among the output sides of the YC separation circuit 22, the luminance signal output side is connected to the input side of the Y recording processing circuit 2Fs, and the color signal output side is connected to the input end of the C recording processing circuit 28. These YC separation circuits 22. Y recording processing circuit 26
．． and C recording processing circuit 28 constitute a recording processing circuit 30.

Next, the output side of the synchronous separation circuit 24 mentioned above.

It is connected to one switching terminal side of the switch 32, and a synchronizing signal output terminal 34 is connected to the other switching terminal side. The common terminal side of the switch 32 is connected to the input side of the vertical synchronization detection circuit 36.

Next, the output side of this vertical synchronization detection circuit 36 is connected to the input sides of a field discrimination circuit 38 and a delay circuit 40, respectively. And field discrimination circuit 3
The output side of the delay circuit 8 is connected to the reset input side of the flip-flop 42, and the output side of the delay circuit 40 is connected to the input side of the flip-flop 42.

The output side of this flip-flop 42 is connected to the other input side of the C recording processing circuit 28 of the recording processing circuit 30 described above. Further, Y recording processing circuit 26.0 recording processing circuit 28. Each output side of switch 32 is connected to terminal 44.46.4.
8, the vertical synchronization detection circuit 36, the field discrimination circuit 38. A frame servo circuit 50 is constituted by the delay circuit 40 and the flip-flop 42, and a common circuit section 52 is constituted as a whole.

Next, the terminals 44, 46° 48 of this common circuit section 52 are
Each of the recording head units 54 is connected to a large number of recording head units 54 . That is, the recording head section 54 is provided with terminals 56, 58, and 60, respectively, and terminals 44, 46, and 48 of the common circuit section 52 are connected to these terminals, respectively.

Among these terminals 56.58.60, terminal 56.58
are connected to the input ends of an adder 66 via polynemes 62 and 64, respectively, and the output side of this adder 66 is connected to the input side of a recording amplifier 68. The output side of this recording amplifier 68 is a rotary transformer 70.72
The video head 76.7 of the drum 74 rotates once through each
8, respectively.

On the other hand, the terminal 60 is connected to the input end of the vertical synchronization detection circuit 80° field discrimination circuit 82, and the output side of the vertical synchronization detection circuit 80 is connected to the field discrimination circuit 82. They are each connected to the input side of the flip-flop 84. The output side of the field discrimination circuit 82 is connected to the reset terminal of this flip-flop 84, and the output side of the flip-flop 84 is connected to a monostable multivibrator 86.
It is connected to one input terminal of the phase comparator circuit 88 via.

Next, the above-mentioned rotating drum 74 or video head 76
．． The signal output side of the pickup head 94 detects the rotational state of the magnets 90 and 92 that rotate simultaneously with the magnets 78 and 78.
They are each connected to the input side of a flip-flop 100 via monostable multi-bi-breaks 96, 98, respectively. The output side of this flip-flop 100 is connected to the other input side of the phase comparison circuit 88 mentioned above.

Next, the motor 1 that rotationally drives the above-mentioned rotating drum 74
02 is provided with a pulse generator 104, and the output side of this pulse generator 104 is connected to the input side of an adder 108 via an F-V conversion circuit 106. The input side of this adder 108 is also connected to the output side of the phase comparison circuit 88 described above, and the adder 108
The output side of is connected to the motor 102 via a motor drive amplifier 110.

Among the above-mentioned units, the synchronization separation circuit 24 separates the synchronization signal from the input video signal. As described above, the recording processing circuit 30 is for obtaining a luminance signal converted into FM from a video signal and a low frequency conversion color signal. Further, the vertical synchronization detection circuit 36.80 detects the vertical synchronization signal from the synchronization signal separated by one, and the field discrimination circuit 38.82 detects the even number, odd number, first . This is to perform second field discrimination.

Next, the lower part of the pickup spatula 94 for detecting the magnet 90.92. Monostable multibibreak 96.98. flip flop 100. Adder 108°, closed loop of motor drive amplifier 110, and pulse generator 104.
F-V conversion circuit 106 which converts the output pulse frequency into a voltage signal. Adder 108° Motor drive amplifier 1
The drum rotation servo is applied by the closed loop of 10.

Frame servo synchronized with color rotation is added to this servo by a phase comparator circuit 88.

The operation of one or more such embodiments will now be described with reference to FIG. First, a video signal (see IAI in FIG. 3) input from the outside to the terminal IO is input to the recording processing circuit 30, where the signal processing described above is performed.

On the other hand, this video signal is input to the sync separation circuit 24, where the sync signal is separated and the vertical sync signal and horizontal sync signal (see f8 in the same figure) are sent to the switch 3.
2 to the vertical synchronization detection circuit 36. The vertical synchronization detection circuit 36 detects a vertical synchronization signal (third
(see C1) is detected, and this is detected by the field discrimination circuit 38. The signals are respectively input to the delay circuit 40.

The field discrimination circuit 38 outputs a field discrimination signal (see El in the figure) which is a pulse output in the first field from the input synchronization signal and vertical synchronization signal.

Further, in the delay circuit 40, the vertical synchronizing signal is delayed by a predetermined amount and output (see Di I in the figure).

The reason for this delay is that according to the VH5 standard,
The color rotation switching point is 6.5 of the vertical synchronization signal.
Since this is to be performed before H, the purpose is to generate the timing at this point.

Next, in the flip-flop 42, the output is set at the timing of the output of the delay circuit 40, and the output is reset at the timing of the discrimination output of the field discrimination circuit 38. As a result, a color rotation control signal frequency-divided by 1'/2 (30 Hz) whose logical value becomes "L" level in the first field is output (see fFl in the figure).

This color rotation control signal is transmitted to the recording processing circuit 3.
0 C recording processing circuit 28, and the direction of color rotation is switched at the timing of this control signal.

On the other hand, on the recording head section 34 side, the video head 76.7
The rotating state of 8 is magnet 90. '42 and the pickup head 94, and the video head 7
A 30 Hz signal representing the rotational state of 6.78 is output from the flip-flop 100.6For example, if the video head 76 records the first field and the video head 78 records the second field, the video When the head 76 is recording, the logical value rL
When the video head 78 is recording, a servo signal having a logical value rHJ is output from the flip-flop 100 to the phase comparator circuit 88.

On the other hand, the vertical synchronization detection circuit 80. Field discrimination circuit 8
2. In the flip-flop 84, the frequency is divided by 1/2 (30Hz) so that the logic value becomes rL4 level in the first field.
The frame servo signal (see 9 in FIG. 3(G)) is generated as described above, and is output to the phase comparator circuit 88.

In the phase comparison circuit 88, the phases of the servo signal from the flip-flop 100 and the frame servo signal from the flip-flop 84 are compared, and the motor drive amplifier 110 drives the motor so that the phases of the two are constant. .

Therefore, when the recording processing circuit 30 of the common circuit section 52 performs color rotation in the direction of the first field, the recording head section 54 performs recording by the head 76 of the first field. In other words, the video head that records the signal of each field is always the same, and the color rotation signal in a certain direction is always recorded with the same video head.
For example, video tapes conforming to the VH5 standard can be produced in large quantities.

Note that the present invention is not limited to the above-described embodiments; for example, the circuit configuration can be modified in various ways so as to achieve the same effect, and the present invention includes these.

FIG. 4 shows an example of a circuit configuration of the present invention that is simpler than the embodiments described above. As shown in the figure,
In the recording head unit 120, the vertical synchronization detection circuit 80. Field discrimination circuit 82. and flip-flop 84 are omitted. Of these, the vertical synchronization detection circuit 80 and the field discrimination circuit 82 are the vertical synchronization detection circuit 36. It is also used as the field discrimination circuit 38, and a flip-flop 84 is provided on the common circuit section 122 side. In this way, the circuit configuration of the plural recording head units 1200 is further simplified.

[Effects of the Invention] As explained above, according to one aspect of the present invention, a recording processing circuit is provided in common to each recording head section, and a servo is provided that makes the color rotation direction caused by this circuit correspond to the recording head in each recording head section. Since the control is carried out, the circuit configuration can be simplified when a large number of recording head units are used simultaneously, and this has the effect of being advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the basic configuration of a video signal recording device according to the present invention, FIG. 2 is a circuit configuration diagram showing an embodiment of the present invention, and FIG. 3 is an operation of the embodiment of FIG. 2. 4 is a circuit configuration diagram showing another embodiment of the present invention, FIG. 5 is an explanatory diagram showing video signal processing in a video tape recorder, and FIG. 6 is a video tape recorder. Fig. 7 is a perspective view showing an example of a video signal recording device having a plurality of decks, and Fig. 8 shows the configuration of the main parts of a conventional video signal recording device. It is an explanatory diagram. 12.30... Recording processing circuit, 14.50-- Frame servo circuit, 16.18.20.54-- Recording head unit, 24...- Synchronization separation circuit, 36.80... Vertical synchronization detection circuit, 38.82--field discrimination circuit,
40...Delay circuit, 42.84.100-...Flip-flop, 68...Recording amplifier, 76°78.
・・Video head, 8B, 96.98−・・Monostable multi-pie break, 88 ・・Phase comparator circuit, 94・
・Pickup head, 102・-Motor, 104・
...Pulse generator, 106-...F-V conversion circuit, 11G...Motor drive amplifier. Patent applicant: Kunio Kakiki, representative of Victor Japan Co., Ltd.

Claims (1)

[Claims] Of the video signals, a luminance FM signal obtained by converting the frequency of the luminance signal and a low-frequency color signal obtained by performing color rotation processing on the color signal are transmitted to a large number of recording media and to a large number of recording heads. In the video signal recording device that simultaneously records video signals, each recording head section is provided with a signal recording processing means that generates the luminance FM signal and the low-frequency color signal, respectively, based on the video signal input from the outside. A video signal recording apparatus further comprising servo control means for making the direction of color rotation of the color signal in the signal recording processing means correspond to the recording head in each recording head section.