Claims
- 1. A non-linear tone detector system comprising:
- receiving means sensitive to at least one input frequency;
- output means for providing an output in the form of turn-on and turn-off signals;
- control means for controlling the output of said output means;
- said control means being adapted to turn off the output means in the absence of a particular frequency or group of frequencies at said receiving means after a predetermined time period, and to turn on said output means after a predetermined time period in the presence of a particular frequency or group of frequencies at said receiving means;
- said time periods being determined by independent actuating means.
- 2. The system of claim 1 wherein said independent actuating means are two independent resistors connected to a common capacitor and to said output means by a common junction.
- 3. The system of claim 2 wherein said control means is a transistor which is connected to said capacitor via a diode coupling means.
- 4. The system of claim 3 wherein said transistor has a biasing network that is DC referenced to the supply voltage potential of its collector and AC referenced to its emitter.
- 5. The system of claim 1 wherein said output means is an electrical gate.
Parent Case Info
This application is a division of application Ser. No. 755,615, filed Dec. 29, 1976; now issued as U.S. Pat. No. 4,130,731, dated Dec. 19, 1978.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
Country |
Parent |
755615 |
Dec 1976 |
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