Filter which tracks changing frequency of input signal

Details Filter which tracks changing frequency of input signal Filter which tracks changing frequency of input signal

1975-04-30

1976-08-31

Heyman, John S.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

328141, 324 78J, 324 78F, 307233R, 307261, H03B 104

Patent

active

039784169

ABSTRACT:
A tracking band-pass filter useful for locking onto, and passing, an input signal which changes rapidly in frequency. The filter has a frequency pass band controlled by a voltage which is derived from the output signal passed by the filter. The output signal is translated from a sine wave to a pulse wave. The period between each two successive pulses is measured by counting the cycles of a oscillator during each respective period. An inverter translates the time-representing count signal to a corresponding frequency-representing voltage which is applied to the filter to control its frequency pass band.

REFERENCES:
patent: 3568077 (1971-03-01), Fujimoto
patent: 3571627 (1971-03-01), Cardon
patent: 3601707 (1971-08-01), Bauer
patent: 3714588 (1973-01-01), Deboo et al.

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