JPS58187092A - Video tape recorder incorporated with television camera - Google Patents

Abstract

PURPOSE:To simplify the signal processing and to reduce the deterioration in signal, by modulating a color difference signal outputted from a color difference signal generating circuit with a carrier of low frequency and obtaining a chrominance signal converted into a low frequency directly from the color difference signal. CONSTITUTION:Color difference signals R-Y and B-Y being outputs of a color difference signal generating circuit 11 are modulated at an orthogonal double balanced modulation circuit 30. The carrier applied to the modulation circuit 30 is outputted from a low frequency oscillator 31. The output of the modulation circuit 30 is in the form of the chrominance signal (C' signal) converted into a low frequency. An addition circuit 33 adds the output of a burst signal generating circuit 32 with the low frequency modulation signal and obtains the chrominance signal C'. Further, a luminance signal being an output of a luminance signal generating circuit 10 is added with the output of a synchronizing signal generating circuit 16, and frequency-modulated. The luminance signal Y' obtained in this way is summed with the chrominance signal C' at an addition circuit 21 to be a recording signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical field to which Komyo belongs] The present invention relates to a video camera integrated with a television camera.

[Technical bar of the invention] Recently, television cameras and video recorders (
The so-called camera-integrated VTR, which is an embodiment of the VTR), is attracting attention. The present invention provides a television recording device that takes advantage of the features of this camera-integrated VTR and adopts a new recording method. First, the recording method of a conventional home-use stationary VFR will be explained. do.

As a recording method for a VTR, a chroma signal (hereinafter referred to as a C signal) low frequency conversion recording method has been generally adopted. This C signal low frequency conversion recording method converts a television signal, for example, an N T'SC signal, into a luminance signal (hereinafter referred to as
In this method, the Y signal is subjected to FM modulation, the C signal is subjected to frequency conversion and low frequency conversion, and the recording signal is obtained by combining the two signals.

This C signal low frequency conversion recording method will be explained in more detail using the drawings. FIG. 1 is a circuit block diagram illustrating the recording system of a portable VTR that allows you to enjoy recording by connecting an Alebisi camera.

The television camera (1) and the recording system (2-) of the VTR are connected by a removable cable (3). The video signal output circuit (9) of the television camera (1) is a circuit that converts an optical image into an electric image using a photocoupler such as a COD, and outputs it as an image (fi). The video signal output circuit (9) outputs the video signal output circuit (9), which is branched and applied to the Y signal generation circuit (10) and the color difference signal generation circuit (11).The color difference signal generation circuit (11) is, for example, Two color difference signals are generated: R-Y and [3-Y (R represents a red color signal and B represents a blue color signal 1).The color difference signal that is the output of the color difference signal Y) generation circuit (11) is as follows. Both are led to a quadrature double balanced modulation circuit <12). In addition to the color difference signals, a carrier wave is also input to the modulation circuit (12) from a carrier wave oscillator (13) at the same time. The oscillation frequency of the carrier wave oscillator (13) is 3.579 in the NTSC system.
5 M l-1z. Two-dimensional balanced modulation circuit (12
) modulates the supplied color difference signal on a carrier wave, and
Output a signal. The C signal obtained in this way is output from the Y signal generation circuit (10), and together with the signal Y (i), the addition circuit (
14). In addition to the Y and C signals, the adder circuit (14) is supplied with a burst signal output from a burst signal generation circuit (15) and a synchronization signal output from a synchronization signal generation circuit (16).

The adder circuit (14) adds these signals and outputs a television signal (NTSC signal).

As described above, the television signal output by the television camera (1) is guided to the recording system (2) of the portable VTR via the cable (3).The television signal is supplied from the television camera (1). The NTSG signal to be detected is first given to the Y-C branch circuit (17). , FM modulation circuit (
18). On the other hand, the separated C signal is branched and connected to a frequency conversion circuit (19) and a burst lock oscillator <2
0). Burst lock oscillator (2
0) locks to the burst signal of the C signal, e.g. r 5C4-(44-1/4) r Hf5c;
It generates an oscillation output No. 13 that corresponds to the color subcarrier frequency of the NTSC signal [H; water 311 and the same signal frequency. This output signal is generated/
Although a Hurst no-lag signal is required for I, it is possible to obtain the horizontal synchronization signal by separating the synchronization signal and further delaying this signal using a delay circuit. The light h! which is the output of the burst lock oscillator 20)! The output signal, like the branched C signal, is processed by a frequency conversion circuit (
1g). The frequency conversion circuit (19) is a circuit that performs low frequency conversion of the supplied C signal and generates a low frequency converted C signal (hereinafter referred to as C' other signal). Difference C between <carrier frequency fsc) and the above oscillation output signal (fsc, + (44-1/4) f'H)
There is (44-1/4) f'+-+ (approximately 688 kl-I
Z). The C' signal output from the frequency conversion circuit 19) has unnecessary frequency components removed by a low-pass filter (not shown), and is guided to the addition circuit <21>. The addition circuit (21) is also supplied with a Y signal (hereinafter referred to as FY' signal) that has been FM modulated by the FM modulation circuit (18). The adder circuit (21) adds the C' signal and the Y' signal to record the recording information "f-3".
will occur. The recording signals obtained in this way are supplied to the video heads (7a) and (7b), and the magnetic tape (
8).

[Problems with the background art] The portable form v −r t? Not only can you connect a TV camera and enjoy recording freely, but there are also some that can be connected to a J-Revision receiver and record programs in the same way as a stationary VTR. The signal to be processed by the VTR's 8L!recording system must first be input in the form of N-SC signal 8, and correspondingly, the signal must be input in the form of a Y-C signal and a C signal low-frequency conversion. For this reason, if we look at cameras and VTRs as a whole, their circuit configurations are complex and large-scale, and the signal processing methods are accordingly complex. If the circuit configuration were followed as is and adopted as the recording system of a camera-integrated VTR, the shape of the reed would become doll-like, the weight would increase, and the consumable horn would also become large. This is particularly contradictory with respect to the small size, light weight, and low power consumption TFI h that are desired for a camera-integrated VTR.Also, from a performance standpoint, signal processing is complex, which tends to cause signal deterioration. It has the disadvantage that good recording cannot be achieved, and it is impossible to apply the Ft! recording method as it is to a camera-integrated VTR, as seen in the conventional i-rev camera and Votaple V'1-R. 3 [Objective of the Invention 1 Shun's invention was made in view of the problem mentioned in 1 above, and provides an integrated VTR that adopts a new recording method with the above configuration. The purpose is to

1 Summary of the Invention 1 The present invention is characterized in that the color difference signal settling circuit modulates the output 16 color difference signals 4 with a low frequency carrier wave, and outputs the C signal which has been low-frequency converted and is lower than the color difference signal. Camera integrated type V
Provide TR.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, the same parts as those in FIG. 1 are given the same numbers, and the explanation thereof will be omitted.

Figure 2 shows a camera-integrated VTR that is an embodiment of the present invention.
FIG. The color difference signals R-Y and BY, which are the outputs of the color difference signal generation circuit (11), are supplied to the quadrature double balanced modulation circuit (30) and modulated. Here, the carrier wave given to the modulation circuit (30) is a low frequency wave, and the optical power of the low frequency carrier wave oscillator (31) is used. The frequency of the carrier wave emitted by the low frequency carrier wave oscillator (31) is (44-1
/4) Set fH. Therefore, the color difference signal modulated by the quadrature double-balanced modulation circuit (30) is in the form of a C signal (C' times signal) that is low-frequency converted.

The low frequency modulation signal that is the output of this modulation circuit (30) is guided to a weighting circuit (33). The output of the burst signal generation circuit (32) is also supplied to the weighting circuit (33).

The burst signal generation circuit (32) is a circuit that generates a burst signal of CM:M1 frequency. Therefore, the burst signal is added to the low frequency modulation signal 2 through the adder circuit (33), and a C'-fold signal 1q can be obtained.

One, 742 which is the output of the luminance signal generation circuit (10)
No. (J, the output of the synchronization signal generation circuit (16)!!
It is added to II (No. 5) in an adder circuit (34), and after A, it is led to a frequency modulation circuit (35) and frequency modulated.

The Y' number added to this is guided to the weighting circuit (21) together with the C' multiplied signal supplied by the adder circuit (33).
There, they are added to form a recording signal.

In the embodiments of the present invention described above, the color difference signals generated by the color difference generation circuit (11) are R-Y,
[Not limited to 3-Y, it may be any arbitrary one.

Furthermore, the vector angle of A is not limited to 906. If the vector angle is not 90°, the right angle 2Φ'V
The carrier wave phase of the lit modulation circuit (30) may be changed according to the vector angle. Further, the modulation circuit does not have to be this white double-balanced modulation circuit (30), and may be one of a type that modulates the amplitude and angle of the square, for example. Furthermore, the C'-fold signal 51. Ushizuru-dō's 1st stage uses O signal processing that is carried out in general VTRs, for example, in order to cancel the paste loss talk from adjacent tracks, the paste [] is inverted by 7 phases every 1] for every other track. It is also possible to adopt a so-called P lij formula in which the signal is activated or deactivated.

In addition, regarding Y signal processing, in order to improve the S/N,
Of course, it is also possible to use a dark clip or the like.

Furthermore, in the above embodiment, the burst signal is 11+1 n after the quadrature double-balanced modulation circuit (30), but it is also possible to add the baseband signal before color difference signal modulation. , 2H, iJt may be connected to the adder circuit 33.

[Effect of the invention] Conventionally, the color difference signal is modulated using fsc as a carrier wave, and C
Get the signal and then do some low frequency conversion? By i, C′
A complicated VJ process was carried out to obtain a double signal, but
According to the present invention, a C'-fold signal can be obtained directly from the color difference signal 3. This simplifies signal processing and reduces signal deterioration.Also, with the simplification of the configuration and processing method, the number of types of internal R1 signals is reduced. The deterioration caused by signal generation is also reduced, and the influence of disturbances can also be suppressed.There are many advantages in preventing such signal deterioration, especially by making the Y-C separation circuit, which was required in the past, into a small circuit. In other words, Y-C separation circuits are usually used to separate C signals. , this problem does not need to be taken into consideration in the present invention and is solved.

Furthermore, in the present invention, the circuit configuration is simplified and the circuit scale is reduced. By doing so, it is possible to not only reduce the size of the device itself, but also reduce the diameter and power consumption. This feature is desirable in a portable TVR, especially in a 7J camera integrated VTR.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a portable VTR to which a camera is connected, and FIG. 2 is a circuit diagram of a camera-type VTR according to the present invention. (7a), (7b)...video head, (8)...
Magnetic tape, (10)... Luminance signal generation circuit, (11)... Color difference signal generation circuit, (16)... Synchronization signal generation circuit, (21)... Addition circuit, (30)...・Right angle double balanced modulation circuit, (31)...
Low frequency carrier wave oscillator, (32)...Purse 1 to signal generation circuit, (33) Addition circuit, (34)...Addition circuit, (35)...Frequency modulation circuit.

Claims (1)

[Claims] Receiving a video signal obtained by transporting the object image,
means for generating a luminance signal and a color difference signal; means for frequency modulating the previous 8i2 luminance signal to generate a frequency modulated luminance signal; and means for modulating the color difference signal with a carrier wave having a lower frequency than the frequency modulated luminance signal; a sifting means for adding the low frequency converted chroma signal outputted by the modulation means and the frequency modulated luminance (No. 8) to obtain a recording signal;
A two-piece television camera video player, characterized in that it has means for recording the recording signal on a recording medium.