Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-07-12
1985-09-10
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
340347SH, H04N 932
Patent
active
045410097
ABSTRACT:
A method and apparatus for sampling a sine wave input signal E(t) with a sampling signal A(t) so as to minimize, in one adjustment, the phase difference between the input signal E(t) and the sampling signal A(t). The input signal E(t) has a frequency F and a cycle T and is used to generate a signal D(t) which has a frequency kf and a phase which is dependent on the phase of input signal E(t), k is a positive integer. The signal D(t) is used to generate a sampling signal A(t) which has a plurality p of possible phase settings, p is a positive integer. Each phase setting is adjusted, with respect to its neighbor phase settings, by increments of T/kp. The phase difference between the sampling signal A(t) and the input signal E(t) is then determined. One of the p possible phase settings of sampling signal A(t) is then selected which minimizes the phase difference. The sampling signal A(t) will thus have a phase which has been adjusted to within T/kp of the input signal phase, in one jump.
REFERENCES:
patent: 3626306 (1971-12-01), Puckette
patent: 3789308 (1974-01-01), Lowdenslager
patent: 4122487 (1978-10-01), Beaulier et al.
patent: 4301466 (1981-11-01), Lemoine et al.
Porrot Pascal
Rougeolle Daniel
Murray Richard
Thomson - CSF
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