VSB mode selection system

Details VSB mode selection system VSB mode selection system

1995-07-13

1998-04-28

Chin, Stephen

Pulse or digital communications

Receivers

375261, 375278, 348470, H03K 900, H04L 2706, H04L 2714, H04L 2722

Patent

active

057455287

ABSTRACT:
A transmitted digital VSB signal comprises a sequence of M-level symbols, where the value of M is defined by a mode control signal which is periodically multiplexed with the transmitted signal. A receiver includes an up/down counter which is reset to a zero count in response to a channel change signal and a latch responsive to the zero count of the counter for storing the next received mode control signal whose accuracy has been verified. The counter is incremented or decremented in response to each subsequently received verified mode control signal which respectively matches or does not match the stored mode control signal. Acquisition of new mode control signals is thereby relatively immune to burst noise, is effected very rapidly after a channel change and less rapidly in the absence of a channel change.

REFERENCES:
patent: 4385383 (1983-05-01), Karchevski
patent: 5351245 (1994-09-01), Pregont et al.
patent: 5363408 (1994-11-01), Paik et al.
patent: 5410368 (1995-04-01), Krishnamurthy et al.
patent: 5452009 (1995-09-01), Citta
patent: 5459456 (1995-10-01), Hosack et al.
patent: 5506636 (1996-04-01), Patel et al.
patent: 5508748 (1996-04-01), Krishnmurthy et al.
patent: 5513185 (1996-04-01), Schmidt

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