Variable bandwidth filter

Details Variable bandwidth filter Variable bandwidth filter

1982-06-14

1984-01-31

Heyman, John S.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

328140, 455266, 455339, 455340, 307520, H04B 110

Patent

active

044292791

ABSTRACT:
The filter has a fixed Q and is coupled to a source of AC signals. A source of pulses is applied to a variable-voltage circuit, the circuit being responsive to each pulse to produce a threshold voltage which varies from a first value toward a second value. A comparator circuit has one input coupled to the filter and a second input coupled to the variable voltage circuit. The comparator produces a signal for a duration related to the time the amplitude of an AC signal from the filter is at least equal to the threshold voltage.

REFERENCES:
patent: 3218641 (1965-11-01), Maynard
patent: 4124817 (1978-11-01), Takahashi
patent: 4158148 (1979-06-01), Teller
patent: 4339828 (1982-07-01), Chasek

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