Signal processing circuit for instantaneous fourier transformati

Details Signal processing circuit for instantaneous fourier transformati Signal processing circuit for instantaneous fourier transformati

1986-07-24

1988-03-01

Smith, Jerry

Boots, shoes, and leggings

364822, G06G 719

Patent

active

047291141

ABSTRACT:
A feedback loop circuit that may be used for Fourier Transform analysis, for carrier acquisition, or for other related purposes, sums the inputs signal, passes it through a delay line to provide an output signal, samples a portion of the output signal in a feedback path, mixes the supplied feedback signal with a first oscillator signal that is several times larger than the center frequency of the allowed input signal bandwidths, eliminates the low sideband frequencies of this mixed signal, mixes this signal with a second local oscillator signal, the frequency of which is lower than the frequency of the first local oscillator by approximately the inverse of the delay time of the input signal, filters out the high sideband frequencies of this signal and combines the remaining feedback signal (either by summation or subtraction) with the input signal.

REFERENCES:
patent: 4085441 (1978-04-01), Fagan
patent: 4531196 (1985-07-01), Lin
patent: 4579125 (1986-04-01), Strobl et al.
patent: 4581715 (1986-04-01), Hyatt
patent: 4583190 (1986-04-01), Salb

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