Digital frequency display device

Details Digital frequency display device Digital frequency display device

1980-02-08

1982-05-25

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

324 78D, 324 78F, 324 79D, H04B 126

Patent

active

RE0309494

ABSTRACT:
A digital frequency display device for digitally displaying the operating frequency of a communication apparatus comprising a reference frequency oscillator, a first frequency mixer for mixing the output frequencies of a first oscillator of the communication apparatus and of the reference frequency oscillator, a second frequency mixer for mixing the output frequency of a second oscillator of the communication apparatus and the resultant frequency provided from the first frequency mixer to produce the display frequency shifted by the reference frequency, and a frequency counter for counting the output frequency from the second frequency mixer and for correcting the shifted frequency component to display the correct frequency.

REFERENCES:
patent: 3938048 (1976-02-01), Elliott
patent: 4061980 (1977-12-01), Sato
patent: 4103290 (1978-07-01), Sekiguchi
patent: 4163943 (1979-08-01), Miki et al.
patent: 4175254 (1979-11-01), Manfreda

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