Method and apparatus for measuring delay and/or gain difference

Details Method and apparatus for measuring delay and/or gain difference Method and apparatus for measuring delay and/or gain difference

1985-04-12

1989-05-09

Sheppard, John W.

Facsimile and static presentation processing

Static presentation processing

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324 83R, 324 88, H04N 1702

Patent

active

048293660

ABSTRACT:
The relative gain and/or delay of two signal transmission channels may be measured by impressing on each channel a repetitive signal comprising a burst packet. The burst packets of the signals applied to the channels are of constant, but different, frequencies, and their amplitudes are related in predetermined manner. The two burst packets are timed to have a predetermined phase relationship at a selected time during the packets. The output signals of the two channels are additively combined, and a determination is made as to at least one of (a) the amplitude of the combined signal at a turning point in the amplitude of the signal envelope and (b) the time relative to the selected time at which a turning point in the amplitude of the signal envelope occurs.

REFERENCES:
patent: 2333322 (1943-11-01), Levy
patent: 3250853 (1966-05-01), Loughlin
patent: 3427541 (1969-02-01), Middleton
patent: 3441843 (1969-04-01), Wainwright
patent: 3706931 (1972-12-01), Subramanian
patent: 3986113 (1976-10-01), Vifran

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