Quality improvement for a digitally transmitted information sign

Details Quality improvement for a digitally transmitted information sign Quality improvement for a digitally transmitted information sign

1988-04-12

1989-08-22

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

371 67, 341163, H04B 1404

Patent

active

048603120

ABSTRACT:
In a digital communication system, a residual signal is generated, encoded, and combined with an encoded information signal in a manner that does not appreciably degrade the encoded information signal. The information contained within the residual signal may be used by the receivers to improve the quality of the recovered signal. The residual signal is modulated such that it may only be recovered when the signal-to-noise ratio is sufficiently high. In this way, the quality of the recovered signal improves with increased signal-to-noise ratio.

REFERENCES:
patent: 4010422 (1977-03-01), Wouda
patent: 4347619 (1982-08-01), Dakin et al.
patent: 4513426 (1985-04-01), Jayant
patent: 4559523 (1985-12-01), Wakita
patent: 4646322 (1987-02-01), Flanagin et al.
patent: 4651328 (1987-03-01), den Hollander et al.
patent: 4719642 (1988-01-01), Lucas

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