Commutating narrowband filter

Details Commutating narrowband filter Commutating narrowband filter

1979-02-05

1980-12-30

Wise, Edward J.

Boots, shoes, and leggings

364572, 364726, G06F 1531

Patent

active

042427320

ABSTRACT:
A signal to be filtered is applied to a commutating filter which is contred by a tunable oscillator tuned to a desired filter frequency. The commutating filter includes a plurality of RC networks to which the input signal is sequentially connected. The output of the commutating filter is a series of discrete voltages from the capacitor sections and of the RC networks which are fed to an analog to digital converter. The resulting digital words produced by the converter are stored in a microprocessor and used to compute the spectral content of the input signal by means of the Discrete Fourier Transform. The computed output from the microprocessor represents the effect of the cascaded filter sections of the system.

REFERENCES:
patent: 3881097 (1975-04-01), Lehmann et al.
patent: 3935437 (1976-01-01), Schmitt et al.
patent: 4093988 (1978-06-01), Scott
patent: 4093989 (1978-06-01), Flink et al.
patent: 4131766 (1978-12-01), Narasimha
patent: 4138730 (1979-02-01), Ali

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