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

1978-05-30

1980-05-20

Heyman, John S.

328140, H03B 304

Patent

active

042041716

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 rectangular voltage waveform which is derived from the output signal passed by the filter. The filter 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 an oscillator during each respective period. The time-representing count is inverted to a frequency-representing count which controls the duty cycle of a rectangular wave used to make the filter track the changing frequency of the input signal.

REFERENCES:
patent: 3539827 (1970-11-01), Crowe
patent: 3978416 (1976-08-01), Sutphin
patent: 4021794 (1977-05-01), Carlson
patent: 4032852 (1977-06-01), Hulls et al.

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