Tone signal decoder

Details Tone signal decoder Tone signal decoder

1980-08-25

1982-09-14

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340539, H04Q 144, G08B 1322

Patent

active

043498205

ABSTRACT:
A tone signal decoder in a remote control device which uses one tone signal to feed information. The tone signal decoder comprises a charge and discharge circuit having a capacitor to control the latter by application of said tone signal thereto, a bypass circuit for charging or discharging said capacitor, when said tone signal is not applied, within the time shorter than the charge or discharge time by said charge and discharge circuit, and a threshold circuit actuated when said capacitor reaches a threshold level. Immediately when said tone signal is interrupted by said bypass circuit, said capacitor is brought into an initial set state to prevent malfunction with respect to the other tone signal fed by the same carrier.

REFERENCES:
patent: 3671939 (1972-06-01), Trimble
patent: 4134108 (1979-01-01), Palmer et al.
patent: 4148020 (1979-04-01), Siemer et al.

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