Device for frequency discrimination of electrical signals

Details Device for frequency discrimination of electrical signals Device for frequency discrimination of electrical signals

1976-03-29

1977-09-20

Heyman, John S.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 70R, 331 18, 329117, 328134, H03K 906

Patent

active

040500268

ABSTRACT:
A device for filtering and frequency discrimination includes a filtering section and frequency discriminator connected in tandem. The filtering section consists of a bandpass filter and two resonant components in series. The discriminator includes two resonant components with their inputs connected in parallel, followed by respective detectors connected to respective inputs of an output differential amplifier. Each of the resonant components is a respective sampled filter tuned to a given respective frequency. Each of the sampled filters is controlled by a respective control signal of corresponding frequency, all control signals being derived from signals supplied from a single high-stability oscillator. The oscillator is preferably a quartz crystal-controlled oscillator.

REFERENCES:
patent: 3758884 (1973-09-01), Bahler et al.
patent: 3855537 (1974-12-01), Condon
patent: 3961172 (1976-06-01), Hutcheon
patent: 3969678 (1976-07-01), Asahara et al.

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