Tone control circuit having a frequency controllable filter

Details Tone control circuit having a frequency controllable filter Tone control circuit having a frequency controllable filter

1973-06-11

1976-03-16

Safourek, Benedict V.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 64, 340171PF, H04B 104

Patent

active

RE0287393

ABSTRACT:
A tone control circuit is in a receiver adapted to respond to a sequence of control tones alternately selected from a first group of tones in a first band of frequencies and a second group of tones in a second band of frequencies, wherein the two bands are separated by an intermediate band and wherein the time duration of the gap between adjacent tones in the sequence of tones is substantially zero, the tone control circuit including a filter device which is tuned to the frequencies of the control tones as they are received, a plurality of AND circuits corresponding in number to the control tones and respectively having one input coupled to the filter device and another input coupled to the preceding AND circuit so that each AND circuit is operative to produce an output only in the presence of a tone being passed by the filter and an output signal from the preceding AND circuit, the filter device being tuneable either manually or electronically via the outlet signals from the AND circuits.

REFERENCES:
patent: 2523914 (1950-09-01), Molnar
patent: 2524782 (1950-10-01), Ferrar et al.
patent: 2531416 (1950-11-01), Ferrar
patent: 3304501 (1967-02-01), Ruthenberg
patent: 3336533 (1967-08-01), Glasser
patent: 3418577 (1968-12-01), Fischer
patent: 3670242 (1972-06-01), McGarvey

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