Method and apparatus for digital frequency selection

Details Method and apparatus for digital frequency selection Method and apparatus for digital frequency selection

1981-01-19

1983-01-18

Heyman, John S.

328110, 328114, 328133, H03K 526, H03K 19003

Patent

active

043694080

ABSTRACT:
A system for selecting a signal having a median frequency from a plurality of periodic signals of different frequencies. In one embodiment, three such periodic signals are converted into corresponding pulse sequences, each having a duty cycle of approximately unity and a frequency which corresponds to the frequency of its associated periodic signal. An output signal is generated which assumes a first logic state when a positive signal slope of a first pulse sequence, which places the first pulse sequence in a first logic state and occurs while the output signal is in a second logic state, is followed by a further positive signal slope of a second pulse sequence, while the first pulse sequence is in its first logic state. The output signal assumes a second logic state when successively negative pulse sequence slopes occur.

REFERENCES:
patent: 3532996 (1970-10-01), Wallace et al.
patent: 3629713 (1971-12-01), Szpilka
patent: 3803497 (1974-04-01), Tyau
patent: 4214213 (1980-07-01), Ferrie

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