KR950004057Y1 - Color system combination apparatus - Google Patents

Abstract

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Description

Color system combination

1 is a block diagram of a color system combination device according to the present invention.

FIG. 2 is a waveform diagram of each part in FIG. 1, FIG. 2 (a) is a waveform diagram of a bandpass filter in a SECAM recorder, and FIG. 2 (b) is a waveform diagram in a 1.1 [MHz] value filter. (c) is a waveform diagram of the 1.1 [MHz] bandpass filter, and (d) is a frequency band diagram through a low pass filter in a PAL recorder.

* Explanation of symbols for main parts of the drawings

11: luminance signal processing unit 12: automatic gain control unit

13a, 13b: low pass filter 14: pre-emphasis

15: white / dark clip portion 16: frequency modulator

17: high pass filter 18a, 18b: color signal processing unit

19a ~ 19d: Band pass filter 20: Bell filter

21: synchronization gate 22: automatic color control unit

23: horizontal sync tip 24: phase shift unit

25a: sub-converter 25b: main converter

26: mixing unit 27: amplifier

Hd: Head

The present invention relates to a color system combination device, and in particular, it is possible to use two systems (PAL, SECAM) as one VAL by mixing (Pixel) PAL recording color level and SECAM recording color level with each other. To a color system combination device.

According to the prior art configuration, when a video signal is input to a VR recorder, the luminance signal processing is commonly processed in the PAL or SECAM method.

That is, the gray signal is automatically adjusted to prevent the input signal level from changing and the color signal component of 433619 [MH _Z ] is removed through the AGC (Automatic Gain Control) which operates so that the output level is always constant. And only 3 [MH _Z ] luminance signal components are detected at the output.

Pre-Emphasis is performed to prevent over-modulation of the FM and clamp to a constant voltage so that the DC voltage does not change at the leading edge of the synchronization signal.

At this time, the signal is raised and the spike is generated at the part where the signal goes up and becomes over-modulated when the FM is modulated. And below a certain level voltage are removed.

The oscillation frequency is then modulated by an oscillator whose oscillation frequency changes according to the level of the video signal, and then converted into a low-carrier FM signal.The luminance signal converted into the FM signal is a low-frequency component of the lower frequency component of the FM signal in the next high pass filter. A component overlapping the frequency component is attenuated and mixed with the PAL color recording component which is the signal component.

Here will be described with respect to the PAL color record component, a luminance component is removed 4. 433619 [MH _Z] of the color signal 4. 433619 [MH _Z] extracted by passing only the color signal component of the (Automatic Color Control) ACC via the buffer Input to the circuit, the ACC keeps the color signal level constant by the burst level and outputs it to the burst emphasis and the main converter, and the color signal from the ACC (4. 433691 {MH _Z ] is inputted to the low pass filter by adding the sum signal and difference of the low-conversion color signal (627 {MH _Z ]) and 4.43 [MHz], and the low pass filter passes only 627 [KHz]. Mixed with and recorded on tape.

However, as described above, the prior art configuration includes only the luminance recorder and the PAL color recorder. When the SECAM color signal is input, the SECAM color component is not recorded, but only the luminance component is recorded.

Therefore, in order to eliminate the conventional problem, the present invention can adjust the color recording current of the Secam color recorder and additionally combine the luminance signals according to the present invention to form a dual system, so that each can be recorded according to the signal. Invented in a color system combination device so as to be described in detail below with reference to the accompanying drawings.

A luminance signal processing unit 11 for processing only a luminance signal of the video signal when input, a low pass filter 13a for detecting only a luminance component from an output signal of the luminance signal processing unit 11, and the low pass filter performing an emphasis; A white / dark clip unit 15 that receives the output of 13a and clamps to a predetermined voltage to prevent overmodulation of the frequency modulator 16, and the low frequency conversion of the FM signal output from the frequency modulator 16 High pass filter 17 for attenuating components overlapping with color signal frequency components, selection switch SW for processing according to the Secam or arm method according to the input video signal, and Secam broadcasting image through the selection switch SW. Synchronize with the bell filter 20 which counts down the color sub-carrier components from the color components detected by the color signal processor 18a and the band pass filter 19a with respect to the signal. A band pass filter 19b that receives the output of the bell filter 20 through a sheet 21 and detects only a color signal component, and an arm PAL through the color signal processor 18b and the band pass filter 19c. Phase frequency of the phase shift unit 24 which shifts the phase according to the control signal of the horizontal color sync tip 23 and the automatic color control unit 22 which keeps the size of the color signal level constant by the burst level. After the sub-converter (25a) and the frequency signal of the sub-converter (25a) through the band pass filter (19d) and the signal of the signal of the automatic color control unit 22 to obtain a component of the difference The main converter 25b outputs to the bandpass filter 13b, and the color of each camera and arm broadcast system through the luminance component through the high pass filter 17 and the bandpass filter 19 and the low pass filter 13b. The signal components are mixed and output to the head Hd via the amplifier 27 It constitutes a mixing portion 26 for.

Referring to the operation and effect of the present invention configured as described above in detail.

In FIG. 1, when the video signal is input, the luminance signal processing is commonly performed in the PAL broadcasting system or the SECAM broadcasting system. Therefore, the luminance signal component will be described first. If only the luminance signal is processed at (11) and sent to the automatic gain control unit (AGC) 12, the control unit 12 always automatically adjusts the output level constantly to prevent variations in the input signal level. When the signal whose output level is adjusted is input to the low pass filter 13a, the low pass filter 13a removes the color signal component of 433619 [MHz] and detects only the luminance signal component of 3 [MHz] for output. do.

Then, the pre-emphasis 14 is black when the high frequency is too high for the luminance signal component detected by the low pass filter 13a. Since the back inversion and the S / N ratio (signal / noise ratio) are reduced, the FM modulation is prevented and clamped to a constant voltage so that the DC voltage does not change at the leading edge of the synchronization signal.

In other words, if the signal is raised and the signal goes up and down, there is a spike, and the FM component is overmodulated when the FM component is modulated, so the white / dark clip unit 15 removes the constant level voltage.

Thereafter, FM modulation is performed with an oscillator whose oscillation frequency changes according to the level of the video signal to convert the low carrier and the FM signal, and the luminance signal converted into the FM signal is then converted through the high pass filter 17 to the low frequency component of the lower frequency component of the FM signal. Components overlapping the frequency components of the color signal to be attenuated.

This signal component is mixed in the mixing section 26 with the PAL color and SECAM color components.

When the image signal is input by the selector switch, the PAL color recorder processes only the color signal at the color signal destination 18b, and removes the luminance component through the band pass filter 19c. ] Is input to the automatic color control unit (ACC) 22 through a buffer. Then, when the color signal level is kept constant by the burst level in the automatic color control unit 22 and outputted to the main converter 25b, the main converter 25b is 4. 433619 [MHz] released from the automatic color control unit 22. The color signal of the phase shift 24, the sub-converter 25a and the output signal of the 433619 [MHz] phase shift 24, the sub-converter 25a and the band pass filter (19d) A signal of the sum and difference of the signal 627 [KHz] and the color signal of 4.43 [MHz] is generated (second (d)) and input to the 1.5 [MHz] low pass filter 13b.

The 1.5 [MHz] low pass filter 13b passes through only 627 [KHz], the luminance signal through the high pass filter 17 and the mixing section 26 are mixed, and is recorded on the tape via the head Hd.

Similarly, the SECAM color recorder detects only the color components shown in FIG. 2 (a) through the color signal processor 18a and the bandpass filter 19a of 4.3 {MHz], and then 1, 1 [ MHz] and counts down two color sub-carrier components (3.9 [MHz] and 4. 75 [MHz]) in the bell filter 20 [second]. (b) as shown in FIG. 2, the second component (c) obtained through the synchronous gate 21 and the bandpass filter 19b is mixed with the luminance component through the high pass filter 17 to obtain an amplifier (REC Amp). After amplification at (27), it is recorded on the tape through the head (Hd).

Therefore, the system combination device according to the present invention has the effect of recording two signals according to signals by adjusting two systems, namely, PAL and SECAM color recording currents, in one V-AL. Will have

Claims (1)

A low pass filter 13a which detects only a luminance signal component among the video signals Vin passed through the luminance signal processing unit 11 and the automatic gain control unit 12, and the row that has been emulated through the preamplification 14; A white / dark clip portion 15 for clamping to a constant voltage to prevent overmodulation of the frequency modulating portion 16 for converting the luminance signal of the pass filter 13a into a low carrier FM signal, and the frequency modulating portion 16; A high pass filter 17 for attenuating components overlapping with the low frequency-converted color signal frequency components among the low-carrier FM signals output from the subfield; The bandpass filter 19a which detects only a color band of 4. 3 [MHz] from the Secam broadcast video signal of the selector switch SW passing through the color signal processor 18a and the bell filter 20 are counted down to synchronize the gate. Signal via 21 Bandpass filter 19d for detecting only 1 [MHz] of the band, and bandpass filter 19c for detecting only a color video signal from a PAL broadcast video signal of a switch SW through the color signal processing unit 18b. ) And the frequency signal through the sub-converter 25a and the bandpass filter 19d to maintain a constant color signal level by the burst level of the color image signal through the bandpass filter. And a main converter 25b for obtaining a sum component or a difference component with respect to the signal of the automatic color controller 22 and outputting it to the low pass filter 13b, and a luminance signal and a band pass through the high pass filter 17. Mixing unit 26 for mixing on SECAM and PAL broadcast color signals through filter 19 and low pass filter 13b and outputting to amplifier 27 and head Hd to record on tape. Color system combination device, characterized in that configured to include.