Filter which tracks changing frequency of input signal
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United States of America Patent
Stats
-
May 20, 1980
Grant Date -
N/A
app pub date -
May 30, 1978
filing date -
May 30, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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