Method and apparatus for digital time-variant filtering

Details Method and apparatus for digital time-variant filtering Method and apparatus for digital time-variant filtering

1982-12-23

1985-08-13

Malzahn, David H.

Boots, shoes, and leggings

367 45, G06F 1531

Patent

active

045354170

ABSTRACT:
A method and apparatus for digital time-variant filtering are disclosed. The digital time-variant filters are implemented using the Hilbert transform and a time-varying instantaneous frequency control function for controlling the cutoff frequency. The digital time-variant filters are adaptable to various filtering processes, that is, as either a high-cut, low-cut, band-pass, or reject filter. The various digital time-variant filters are stable in that no unusual transients occur in the output signal; are flexible in that the cutoff frequency is controlled by a selectable time-varying control function signal; and are efficient in that computational requirements are only twice to 16 times that of known digital time-invariant filters.

REFERENCES:
patent: 3701091 (1972-10-01), Lenihan
patent: 4106102 (1978-08-01), Desblache
patent: 4435773 (1984-03-01), Gockler et al.
Cain, "Hilbert-Transform Description of Linear Filtering", Electronics Letters, Jul. 27, 1972, vol. 8, No. 15, pp. 380-382.
Roy et al., "Digital Low-Pass Filtering Using the Discrete Hilbert Transform", IEEE Trans. on Acoustics, Speech & Signal Processing, vol. ASSP-26, No. 5, Oct. 1978, pp. 465-467.
Sabri et al., "Discrete Hilbert Transform Filtering", IEEE Trans. on Acoustics, Speech & Signal Processing, vol. ASSP-25, No. 5, Oct. 1977, pp. 452-454.
Saraga, "New Class of Time-Varying Filters", Electronics Letters, Apr. 1967, vol. 3, No. 4, pp. 158-159.
Gold et al., "Theory & Implementation of the Discrete Hilbert Transform", Computer Processing in Communications, 1969, pp. 235-250.

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