Telegraphy – Systems – Printing
Patent
1975-10-21
1977-05-31
Griffin, Robert L.
Telegraphy
Systems
Printing
178 88, 325 42, 325473, H04B 110
Patent
active
040272508
ABSTRACT:
Means and method are provided for correcting for the effects of amplitude and phase jitter, in the presence of noise on quadrature signals transmitted over a channel at regular intervals as quadrature pairs. The signal values of respective signal elements of sequentially transmitted quadrature pairs, as received are measured. Responsive to such measurement a first decision is made as to which pair of quadrature signals was transmitted. The measured value and value from the first decision for the same signal are compared for each signal and as a result of such comparison measures of the amplitude and phase errors occurring during transmission. The measures of amplitudeand of phase errors are averaged over respective pluralities of intervals. The measured signal values are transmitted over a line and modified to compensate for the average values of the phase errors and of the amplitude errors. The signal values so modified are used as the basis of a second decision as to the elements modified.
REFERENCES:
patent: 3407355 (1968-10-01), Clark et al.
patent: 3644830 (1972-02-01), Ragsdale
patent: 3800228 (1974-03-01), Acker
patent: 3878468 (1975-04-01), Falconer et al.
Griffin Robert L.
Ng Jin F.
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