KR890017991A - FM color recording and playback circuit of video recorder - Google Patents

Abstract

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Description

FM color recording and playback circuit of video recorder

Since this is an open matter, no full text was included.

3 is a block diagram of an FM color recording circuit according to the present invention. 4 is a detailed view of the FM color processing section of FIG.

Claims (3)

In the FM color recording circuit of a video recording and reproducing apparatus, an automatic gain controller (103) for automatically adjusting the gain of an input video signal, and Y / for separating the output video signal of the automatic gain controller (103) into a luminance signal and a color signal. The C separator 105, the first luminance processor 111 for FM modulation output of the luminance signal output of the Y / C separator 105, and the low frequency conversion of the color signal output of the Y / C separator 105 are output. FM color processing means for low-converting the color signal output of the Y / C separator 105 and FM-modulated output by a corrected subcarrier, and the first luminance processing unit 111 and the first color processing unit 113. And a preamplifier (117) which input-mixes each of the outputs of the color processing unit (113) and the FM color processing means, and amplifies a predetermined signal to record on a tape through the recording head (123). The automatic color gain controller 303, wherein the FM color processing means adjusts the gain of the input color signal by a predetermined control, and detects the level of the burst signal of the output signal of the automatic color gain controller 303. Oscillation means for providing a control signal of the automatic color gain controller 303 and oscillating and outputting a subcarrier synchronized with the phase of the color signal, and a color signal of the automatic color gain regulator 303 by the subcarrier of the oscillation means. A balanced modulator 305 for low-modulating the output by performing balanced modulation, and an FM modulator 121 for FM modulating and outputting the output of the balanced modulator 305 by a predetermined subcarrier fc. FM color recording and reproducing circuit of a video recording player. In the FM color reproduction circuit of the video recording and reproducing apparatus, the second preamplifier 127 for amplifying the output of the head 125 picking up the signal recorded on the tape and the output signal of the second preamplifier 127 A second band pass filter 129, a low pass filter 131, and a high pass filter 133, respectively inputted to filter and output signals of the FM luminance modulation band, the low frequency conversion color signal band, and the FM modulation color signal band, respectively; A second luminance processor 135 for demodulating and outputting an FM modulated luminance signal by inputting the output of the second band pass filter 129, and a low-pass color output of the loop pass filter 131 to demodulate a color signal. A fourth color processor 137 for outputting and a FM modulated color signal of the high pass filter 133 to demodulate and extract a low-conversion color signal, and then modulate it by a predetermined subcarrier to output a color signal A color processing unit 139 and the second; A mixer 143 for mixing a preprocessing unit 135 with a demodulated color signal in a predetermined state and outputting a composite video signal, and outputting the outputs of the third and fourth color processing units 137 and 139 to a predetermined switching operation. A selector switch 141 which is selected by the controller 143 and inputs the input signal to the mixer 143, wherein the color signal processing the output of the low pass filter 131 and the color signal processing the output of the high pass filter 133 FM color recording reproducing and reproducing circuit of a video recording and reproducing apparatus, characterized in that the mixed video signal is reproduced by mixing a selection signal and the output of the second luminance processing unit (135). ※ Note: The disclosure is based on the initial application.