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Patent Agency Ranking
公开(公告)号：KR800000581B1
公开(公告)日：1980-06-26
申请号：KR750002038
申请日：1975-09-15
Applicant: RCA CORP
Inventor： AMERY J
Abstract: In a system receptive to the first composite video signal which has a mominal line frequency and a luminance signal componet, a given band of frequencies & a chrominance signal component are interleaved in a portion of the signal band. this filter comprises conversion means(18,20,26,28,30), a delay apparatus(58), the first signal responding devices(46,48,68),the second signal responding device and synthesizing devices(82,84,118).
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公开(公告)号：BR7503494A
公开(公告)日：1976-05-25
申请号：BR7504471
申请日：1975-06-04
Applicant: RCA CORP
Inventor： AMERY J
Abstract: In a video disc player, an FM signal recovered from the disc is subject to frequency demodulation to obtain a composite color video signal. In the composite signal, chrominance information appears in the form of a modulated subcarrier buried in spectrum troughs in the midband of a wider band luminance signal. The composite signal is applied to a modulator to develop amplitude modulated carrier waves, which serve as the "normal" signal input to a 1H delay line. Comb filter circuits respond to the delay line input and output to obtain separated chrominance and luminance signal components, which are suitably processed for delivery to color image display apparatus (e.g., color television receiver). The amplitude modulated carrier wave output of the delay line is also utilized as a "substitution" signal input to the delay line, replacing the normal signal input when a defect detector, monitoring the output of the FM demodulator, indicates the onset of a picture defect. The substitution signal path includes a network providing respectively different amounts of phase shift at the carrier frequency, and at the sideband frequency associated with the color subcarrier. In a variant of the aforesaid arrangement, switching between normal and substitution signals is effected in the video domain. A composite signal from the output of the FM demodulator is normally supplied to the amplitude modulator input, but, upon defect detection, a detected version of the amplitude modulated carrier wave output of the delay line is substituted.
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公开(公告)号：IN143859B
公开(公告)日：1978-02-11
申请号：IN983CA1975
申请日：1975-05-16
Applicant: RCA CORP
Inventor： AMERY J
Abstract: In a video disc player, an FM signal recovered from the disc is subject to frequency demodulation to obtain a composite color video signal. In the composite signal, chrominance information appears in the form of a modulated subcarrier buried in spectrum troughs in the midband of a wider band luminance signal. The composite signal is applied to a modulator to develop amplitude modulated carrier waves, which serve as the "normal" signal input to a 1H delay line. Comb filter circuits respond to the delay line input and output to obtain separated chrominance and luminance signal components, which are suitably processed for delivery to color image display apparatus (e.g., color television receiver). The amplitude modulated carrier wave output of the delay line is also utilized as a "substitution" signal input to the delay line, replacing the normal signal input when a defect detector, monitoring the output of the FM demodulator, indicates the onset of a picture defect. The substitution signal path includes a network providing respectively different amounts of phase shift at the carrier frequency, and at the sideband frequency associated with the color subcarrier. In a variant of the aforesaid arrangement, switching between normal and substitution signals is effected in the video domain. A composite signal from the output of the FM demodulator is normally supplied to the amplitude modulator input, but, upon defect detection, a detected version of the amplitude modulated carrier wave output of the delay line is substituted.
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