Television – Receiver circuitry – Intercarrier circuits
Patent
1995-04-17
1996-03-05
Groody, James J.
Television
Receiver circuitry
Intercarrier circuits
348726, 348475, 375326, 375329, H04N 5455
Patent
active
054972051
ABSTRACT:
A vestigial-sideband amplitude-modulation transmitter using a balanced modulator for generating a suppressed carrier that is in quadrature phasing with the video carrier of a television signal receives as modulating signal a binary phase-shift-keying (BPSK) signal encoding digital signals. The quadrature transmission reduces the visibility of the lower-frequency PSK sidebands in the TV signal as viewed on screen. The symbol rate of the PSK is made to be a multiple of the horizontal line scan rate of video signal. To reduce the visibility of the higher-frequency PSK sidebands in the TV signal as viewed on screen, the BPSK is transmitted twice during respective frames of successive pairs of data frames, which data frames recur at the same rate as video frames. To reduce the interference of video with the BPSK, the BPSK is comb filtered at the digital signal receiver and after symbol detection is subjected to partial-response filtering for recovering the digital signal originally encoded in the BPSK signal.
REFERENCES:
patent: 4581586 (1986-04-01), Rubin
patent: 5003397 (1991-03-01), Wink
patent: 5122879 (1992-06-01), Ito
patent: 5260793 (1993-11-01), Citta et al.
Limberg Allen L.
Yang Jian
Groody James J.
Murrell Jeffrey S.
Samsung Electronics Co,. Ltd.
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