Tone detection circuitry

Details Tone detection circuitry Tone detection circuitry

1981-04-01

1983-01-25

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082548, 324 78Z, H04Q 900, H04Q 1102, G01R 2302

Patent

active

043706509

ABSTRACT:
Tone detection circuitry including tone decoder providing a free running frequency determined by timing resistance and timing capacitance connected to it. A control means including a programmable microprocessor establishes a retrieval record based on the product of the timing resistance and timing capacitance needed to establish the center frequency of the tone decoder for a plurality of bandwidths. The retrieval record is used to establish the product of the timing resistance and timing capacitance when a tone within the selected bandwidth is to be detected.

REFERENCES:
patent: 3952288 (1976-04-01), Carpenter et al.
patent: 4208626 (1980-06-01), Gregg, Jr.
patent: 4215308 (1980-07-01), Kusters
patent: 4236110 (1980-11-01), Shearer et al.
patent: 4271746 (1981-06-01), Dobbie
"A Switchable Active Filter Hybrid", M. Probstein, IEEE Transactions on Parts, Hybrids, and Packaging, Sep., 1976, vol. PHP-12, No. 3, pp. 201-206.

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