1974-09-09
1976-03-02
Mayer, Albert J.
325317, 325421, 325423, 325453, 325459, 325460, 325464, 325468, H04B 116
Patent
active
039421210
ABSTRACT:
Digitally controlled tuning by storing a digital code representative of the frequency of a selected channel and generating successive digital counts, each proportional to the number of cycles of an oscillator signal in each of a plurality of successive uniform sample intervals. The digital code is then compared with a digital count to generate a first output when equal, a second output when the code exceeds the count, and a third output when the count exceeds the code. The frequency of the oscillator is varied in response to one of the second and third outputs to increase or decrease the frequency, respectively, and to permit the frequency of the oscillator to lock in response to the first output signal.
REFERENCES:
patent: 3641434 (1972-02-01), Yates
patent: 3748645 (1973-07-01), Kawashima
patent: 3753142 (1973-08-01), Nardin
patent: 3769602 (1973-10-01), Griswold
patent: 3803494 (1974-04-01), Howell et al.
patent: 3835384 (1974-09-01), Liff
patent: 3855548 (1974-12-01), Nandi et al.
patent: 3864635 (1975-02-01), Ewanus
Bell David B.
Cipher John A.
Comfort James T.
Dixon James O.
Levine Harold
Mayer Albert J.
Texas Instruments Incorporated
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