Technique for determining signal dispersion characteristics in c

Details Technique for determining signal dispersion characteristics in c Technique for determining signal dispersion characteristics in c

1990-03-14

1990-12-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, 358 21V, 375 13, 375 15, H04N 708

Patent

active

049807676

ABSTRACT:
The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting training sequences. More specifically, each sequence comprises a plurality of predetermined symbols and is transmitted two or more times. Detection of each training sequence is provided by a correlator at the receiver. This detection creates a signal peak for each training sequence at the output of the correlator. Between the peaks, a "quiet zone" is created which permits signal dispersion in this zone to be characterizerd with respect to amplitude, phase and delay. Two different quiet zones are utilized to resolve ambiguities which arise in determining the aforesaid signal dispersion characteristics.

REFERENCES:
patent: 4009356 (1977-02-01), Borysiewicz
patent: 4335396 (1982-06-01), Rzeszewski
patent: 4394767 (1983-07-01), Shum
patent: 4694328 (1987-09-01), LoCicero
patent: 4864403 (1989-09-01), Chao
patent: 4912557 (1990-03-01), Faroudja
Chao, Tzy-Hong S., "Multi-Path Equalization for NTSC Video by Using Digital IIR Filter,"IEEE Transactions on Consumer Electronics, vol 34, No. 1, Feb. 1988, pp. 268-278.
Advanced Television Systems Committee (ATSC) Standards proposal by the Japanese Broadcasting Technology Association presented during ATSC Standard Committee Meeting, Sep. 18, 1989, "Ghost Cancelling System".

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