Frequency counting apparatus

Details Frequency counting apparatus Frequency counting apparatus

1979-03-26

1982-03-16

Thesz, Joseph M.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

235 92TF, 235 92DP, 235 92T, 368 10, G01R 2302

Patent

active

043205291

ABSTRACT:
A frequency counting apparatus is advantageously utilized as a frequency counter for displaying in a digital manner the frequency being received by a radio receiver. The inventive frequency counting apparatus includes a quartz resonator adapted to oscillate at the frequency of 2.sup.n Hz where n is a positive integer, for example 32,768 Hz, and a microprocessor including a programming unit, an operating unit for making operation in accordance with a program of the programming apparatus, a counter and a control unit. The program steps of the programming unit are made to progress based on the oscillation output signal of the quartz resonator. The counter is supplied with a local oscillation signal of a radio receiver. The local oscillation signal supplied to the counter is gated for a predetermined time period determined in accordance with the program of the programming unit, whereby the local oscillation signal is counted. The count value in the counter is multiplied or divided by a prescribed correction factor preloaded in the programming unit by means of the operating unit.

REFERENCES:
patent: 2851596 (1958-09-01), Hilton
patent: 3158854 (1964-11-01), Keen et al.
patent: 3681707 (1972-08-01), Bean
patent: 4027146 (1977-05-01), Gilmore
patent: 4107600 (1978-08-01), McMannis
patent: 4163943 (1979-08-01), Miki et al.

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