JPS63258185A - Chroma signal processor - Google Patents

Abstract

PURPOSE:To attain special processing of a chroma signal under image picking up by a camera or tape edition by providing a single-color chroma signal generation means capable of varying a chroma into an arbitrary hue, a chroma signal attenuation means capable of transducing a single-color chroma signal into an arbitrary chroma density, and two selection means to suitably select chroma signals and output them. CONSTITUTION:A recording chroma signal S1 or a single-color chroma signal S2 supplied to the terminal (c) of a first changeover switch 16 is branched into two pieces by a branching device. One of the two pieces is directly supplied to the terminal (a) of a second changeover switch 19 while the other is supplied to the chroma signal attenuation circuit 18. The circuit 18 receives a chroma signal replacing pulse S5 from a monostable multivibrator circuit 10 and varies the level of the inputted recording chroma signal S1 or the single-color chroma signal S2 during the H-level of said pulse S5. Accordingly, an arbitrary single-color chroma signal or a chroma signal of a different density can be set at the time of recording, therefore, a video can be easily generated at the time of picking up an image with a camera or editing a tape by dubbing. By reproducing from a tape thus recorded in various kinds of mode, a special video can be enjoyed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a chroma signal processing device, and is used, for example, in a video tape recorder (hereinafter abbreviated as VTR), a camera-integrated VTR, and the like.

(Prior Art) Recent camera-integrated VTRs are becoming more and more popular despite diversification into 8 mm format, VH3 format, VH3-C format, etc. Conventionally, this camera-integrated VTR records an image captured by a camera during shooting on a tape as it is, and then plays it back as it is through the VTR's processing circuit during playback. Therefore, in addition to simply recording and playing back the video captured by the camera, this function can go one step further and enhance the tape editing effect by applying special image processing when editing with a single camera or dubbing. There was a demand for a VTR equipped with

(Problems to be Solved by the Invention) As described above, the current situation is that conventional camera-integrated VTRs are not equipped with a function for performing special image processing. In addition, even when editing tape by dubbing, the video deck does not have a built-in processing circuit that turns the video into a special image, and in order to bring out the tape editing effect during tape editing, special equipment such as a video effector is required. There were also problems such as the need to connect the video processing device to the video deck.

(Means for Solving the Problems) The chroma signal processing device of the present invention arbitrarily outputs a chroma signal from an imaging device or a chroma signal separated from an external video signal in a chroma signal recording processing system in a magnetic recording and reproducing device. a monochromatic chroma signal generating means that is variable in hue; a first selecting means for appropriately selecting and outputting the monochromatic chroma signal generated by the monochromatic chroma signal generating means and the chroma signal; chroma signal attenuation means capable of varying the selected chroma signal or monochrome chroma signal to an arbitrary chroma density; a chroma signal or monochrome chroma signal whose chroma density has been changed by the chroma signal attenuation means; and the first selection means. and a second selection means for appropriately selecting and outputting the chroma signal or the monochromatic chroma signal selected by.

(Operation) A monochrome chroma signal is created by varying the chroma signal from the imaging device or the chroma signal separated from the external video signal to an arbitrary hue by the monochrome chroma signal creation means. The first selection means appropriately selects and outputs the monochrome chroma signal created by the monochrome chroma signal creation means and the chroma signal. The output from the first selection means is branched into two, one of which is input to the chroma signal attenuation means where it is changed to an arbitrary chroma density, and then input to one terminal of the second selection means. At the same time, the other branched output is directly input to the other terminal of the second selection means. The second selection means selects and outputs the signals inputted to both terminals as appropriate, thereby outputting a special chroma signal that has undergone special processing. This allows special processing of chroma signals while shooting with a camera or editing a tape.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic block diagram of a chroma signal processing device of the present invention.

In the same figure, 1 is an input terminal for recording chroma signals, and 2 is an A
CC circuit, 3 is an ACC detection circuit, 4 is an APC circuit, 5 is an oscillation frequency of 3.58 MHz, 0SC16 is an input terminal for a recording luminance signal, 7 is an equalizer, 8 is a synchronization separation circuit, 9
1 is a burst gate pulse generation circuit, 10 is a monomulti circuit, 11 is a buffer circuit, 12 is a phase adjustment volume,
13 is a phase shifter, 14 is a gain control circuit, 15 is a chroma signal switching circuit, 16 is a first changeover switch, 17 is a density adjustment volume, 18 is a chroma signal attenuation circuit, 19
is a second changeover switch, 20 is a chroma conversion circuit, 21 is a low-pass filter (LPF), 22 is a Y/C mixing circuit,
23 is an input terminal for a chroma density control signal, 24 is an input terminal for a monochrome chroma control signal, 25 is an output terminal for a recording chroma signal, and 26 is an output terminal for a video signal.

Next, the operation of the chroma signal processing apparatus having the above configuration will be explained with reference to the signal waveform diagram of each part shown in FIG.

A recorded chroma signal supplied from a camera signal chroma processing circuit (not shown) or a recorded chroma signal separated from an external video signal is manually inputted from an input terminal 1 and supplied to an ACC circuit 2. ACC circuit 2 is ACC detection circuit 3
It is controlled by a DC voltage created based on the burst signal detected by the The recording chroma signal S (see FIG. 2(a)) output from the ACC circuit 2 is supplied to the a terminal of the first changeover switch 16, the APC circuit 4, and the ACC detection circuit 3, respectively.

On the other hand, a recording luminance signal supplied from a camera signal luminance processing circuit (not shown) or a recording luminance signal separated from an external video signal is input from an input terminal 6, passes through an equalizer 7, and is connected to a synchronization separation circuit 8 and a Y/ C mixing circuit 22.

The synchronization separation circuit 8 separates the synchronization signal from the input recording luminance signal and supplies the separated synchronization signal to the burst gate pulse generation circuit 9.

The burst gate pulse generation circuit 9 generates a burst gate pulse from this synchronization signal, and supplies burst signals extracted from the burst gate pulse to the ACC detection circuit 3, APC circuit 4, and mono-multi circuit 10, respectively. .

In the APC circuit 4, the recording chroma signal S1 inputted from the ACC circuit 2 and 3.58M Ilz from 03C5
The phase is compared with the signal of 03C5, and the output is feedbanked to 03C5. As a result, 0305 is always phase-locked to the burst signal.

The output of this 03C5 passes through the next buffer circuit 11, phase shifter 13, and gain control circuit 14, and becomes a monochromatic chroma signal S of 3.58 MHz having a predetermined phase shift and amplitude.
Z (see FIG. 2 (bl)) and then supplied to the chroma signal switching circuit 15. In the chroma signal switching circuit 15, the chroma signal switching pulse SS generated from the burst gate pulse by the mole multi circuit 10 is supplied to the chroma signal switching circuit 15. (See FIG. 2(e)), the r of the chroma signal exchange pulse S,
Recording chroma signal S from the ACC circuit 2 only during the HJ level section.

is replaced with the monochromatic chroma signal S2 and supplied to the b terminal of the first changeover switch 16. The hue of this monochromatic chroma signal S2 can be arbitrarily set using a phase adjustment volume 12.

The first changeover switch 16 normally has one terminal a to c connected to receive the recording chroma signal S from the ACC circuit 2.

is supplied to the C terminal (common terminal). Then, when the monochromatic chroma control signal S6 is input manually from the input terminal 24, b
Switching to the terminal side, the monochromatic chroma signal S2 is now supplied to the C terminal (common terminal). In this way, the recording chroma signal S1 or monochromatic chroma signal S2 supplied to the C terminal of the first changeover switch 16 is transferred to the branching device (
(not shown), one of which is directly supplied to the C terminal of the second changeover switch 19, and the other is supplied to the chroma signal attenuation circuit 18. The chroma signal attenuation circuit 18 uses the chroma signal exchange pulse S from the monomulti circuit 10 to
, the level of the input recording chroma signal S or the monochromatic chroma signal S2 is changed only during the rHJ level section of . This level change can be made arbitrarily using a density adjustment volume 17. Additionally, it is also possible to turn off the chroma signal. The chroma signal whose level has been changed is transferred to the second changeover switch 19.
is supplied to the b terminal of The second changeover switch 19 is normally connected to terminals ac, and the output signal of the first changeover switch 16 is directly supplied to the C terminal. and,
Chroma density control signal S? from input terminal 23? When inputted, it is configured to switch to the b terminal side. Therefore, when the chroma density control signal S and the monochrome chroma control signal S are not input from the C terminal of the second changeover switch 19, the recording chroma signal S from the ACC circuit 2 shown in FIG. 2(a), However, when only the chroma density control signal S7 is input, the signal S shown in FIG. 2 (C1) is input, but when only the monochrome chroma control signal S is input, the second
When the monochrome chroma signal St shown in FIG. 2B is input to both the chroma density control signal s7 and the monochrome chroma control signal S6, the signal S4 shown in FIG. 2D is output.

The chroma signal from the C terminal of the second changeover switch 19 is input to the Y/C mixing circuit 22 and is also supplied to a well-known chroma signal processing circuit system (chroma conversion circuit 20, low-pass filter 21, output terminal 25). be done.

The Y/C mixing circuit 22 mixes the chroma signal from the C terminal and the luminance signal obtained via the equalizer 7, and outputs the mixed signal from the output terminal 26 as a video signal. This allows color monitoring even during special processing of chroma signals.

(Effects of the Invention) As explained above, according to the chroma signal processing device of the present invention, arbitrary monochromatic chroma signals or chroma signals with different densities can be set during recording, so especially when shooting with a camera or editing a tape by dubbing. You can easily create videos, and by playing back tapes recorded in various modes in this way, you can enjoy special videos.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a chroma signal processing device of the present invention, and FIG. 2 is a signal waveform diagram of each part of the device. 2...ACC circuit 3...ACC detection circuit 4...APC circuit 5...0SC7.
・Equalizer 8 ・Synchronization separation circuit 9・
... Burst gate pulse generation circuit 10 ... Mono-multi circuit 11 ... Buffer circuit 12 ... Phase adjustment volume 13 ... Phase shifter 14 ... Gain control circuit 15 ... Chroma signal switching circuit 16...First changeover switch 17...Density adjustment volume 18...Chroma signal attenuation circuit

Claims (1)

[Scope of Claims] 1) In a chroma signal recording processing system in a magnetic recording and reproducing device, a monochromatic chroma signal generating means capable of changing a chroma signal from an imaging device or a chroma signal separated from an external video signal to an arbitrary hue. a first selection means for appropriately selecting and outputting the monochrome chroma signal created by the monochrome chroma signal creation means and the chroma signal; and the chroma signal or the monochrome chroma signal selected by the first selection means. a chroma signal attenuation means capable of varying the chroma density to an arbitrary chroma density; a chroma signal or a monochrome chroma signal whose chroma density has been changed by the chroma signal attenuation means; and the chroma signal or the monochrome chroma signal selected by the first selection means. and second selection means for appropriately selecting and outputting a signal.