Signal processing systems

Details Signal processing systems Signal processing systems

1980-06-23

1983-12-27

Rubinson, G. Z.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 99, E04B 199

Patent

active

044232896

ABSTRACT:
A signal processing system which can be readily adjusted to achieve a desired complex transfer function of arbitrary form. The system comprises a frequency sampling filter system from each individual filter of which in-phase and quadrature components are derivable. The sum of these components for all the filters is obtained to provide the output of the system, the proportions in which the components are summed being independently variable for each component, for example by adjustment of attenuators or multipliers. Such a system has particular application in the field of active sound control.

REFERENCES:
patent: 3591699 (1971-07-01), Cutler
patent: 3755738 (1973-08-01), Gitlin et al.
patent: 3936606 (1976-02-01), Wanke
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4044203 (1977-08-01), Swinbanks
patent: 4109108 (1978-08-01), Coxon et al.
patent: 4118601 (1978-10-01), Yeap
patent: 4122303 (1978-10-01), Chaplin et al.
patent: 4130727 (1978-12-01), Kates
patent: 4171465 (1979-10-01), Swinbanks
patent: 4218950 (1980-08-01), Uetrecht
patent: 4276802 (1981-07-01), Mieda
"The Active Control of Sound Propagation in Long Ducts", M. A. Swinbanks, pp. 411-436, Journal of Sound & Vibration, vol. 27, 1973.
R. E. Bogner, "Frequency Sampling Filters", Introduction to Digital Filtering, pp. 139-147, (Chapt. 8), (Wiley), 1975.

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