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

1976-01-02

1977-06-28

Heyman, John S.

328160, 328127, H03B 104

Patent

active

040328520

ABSTRACT:
A signal-frequency tracking band-pass filter useful for passing an input signal which changes rapidly in frequency. The tracking filter includes a voltage-controlled band pass filter, and a frequency-to-voltage converter for translating the output frequency of the filter to a voltage for controlling the pass band center frequency of the filter. The Q of the filter is controlled by a feedback circuit which makes the Q vary inversely with output signal amplitude. The Q is high for weak signals that are hard to lock on to, and the Q is low for strong signals to facilitate tracking of signals which change rapidly in frequency. The filter is especially useful for inclusion in internal combustion engine diagnostic equipment.

REFERENCES:
patent: 3696252 (1972-10-01), Chapman
patent: 3805173 (1974-04-01), Nakamura et al.
patent: 3835399 (1974-09-01), Holmes
patent: 3919648 (1975-11-01), Uetrecht

Affiliated with

Also associated with

Rating

Filter which tracks changing frequency of input signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Filter which tracks changing frequency of input signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter which tracks changing frequency of input signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1523971