Pre-frame-comb as well as pre-line-comb partial-response filteri

Details Pre-frame-comb as well as pre-line-comb partial-response filteri Pre-frame-comb as well as pre-line-comb partial-response filteri

1994-01-05

1996-10-08

Peng, John K.

Television

Format

Including additional information

348473, H04N 708

Patent

active

055636640

ABSTRACT:
BPSK modulation of suppressed carrier in quadrature with a video carrier amplitude-modulated by composite video signal is used for transmitting a serial-bit digital signal, which is subjected both to "pre-line-comb" and "pre-frame-comb" partial-response filtering prior to conversion to BPSK modulating signal. The "pre-frame-comb" partial-response filtering of the serial-bit data is done on a continuous basis, rather than transmitting frames of the BPSK twice, once in positive logic and once in negative logic, during successive pairs of consecutive frames of the NTSC television signal. This results in the full luminance bandwidth below chroma frequencies being available on average for the transmission of BPSK, rather than half that bandwidth.

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T. C. Leslie and B. Singh, "An Improved Sigma-Delta Modulator Architecture", 1990 IEEE Symposium on Circuits and Systems, 90 CH 2868-8900000-0372, pp. 372-375.

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