Pulse counter-type FM detector

Details Pulse counter-type FM detector Pulse counter-type FM detector

1980-04-16

1982-09-21

Karlsen, Ernest F.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

307273, 307510, 329128, 455214, H03D 304, H03K 3284, H04B 116

Patent

active

043509576

ABSTRACT:
In a pulse counter-type FM detector circuit for obtaining audio signals at an output terminal by detecting FM signals in the following order through a limiter circuit, a trigger pulse generating circuit, a monostable circuit and an integrator connected to the output terminal where the monostable circuit comprises a gate circuit having at least two inputs where trigger pulses from the trigger pulse generating circuit are applied to a first one of the two inputs and a feedback signal to the other input, a differentiating circuit responsive to the output from the gate circuit, a differential inverter having a power supply and where the integrator includes an LC type low pass filter connected to the output side of the differential inverter circuit, the improvement comprising a terminal resistor connected between the power supply and the output terminal so that a part of the current flowing in the differential inverter circuit is diverted through the terminal resistor.

REFERENCES:
patent: 3723764 (1973-03-01), Sharp
patent: 4236253 (1980-11-01), Onishi et al.

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