Digital band pass elliptic filter system

Details Digital band pass elliptic filter system Digital band pass elliptic filter system

1995-09-28

1996-06-25

Envall, Jr., Roy N.

Boots, shoes, and leggings

36472617, 3647262, G06F 1710

Patent

active

055306608

ABSTRACT:
The filter coefficients of a digital band pass elliptic filter can be approximated to a linear function of the center frequency of the pass band width. The filter coefficients of a band pass digital filter having a predetermined center frequency and the slope of this linear function are stored in first and second memories. A central processing unit (CPU) obtains the difference between a desired center frequency and a predetermined center frequency. A multiplier multiplies the slope stored in the second memory by the difference obtained by the CPU. An adder adds each of the filter coefficients stored in the first memory to an associated one of the products output from the multiplier. The adding results become the filter coefficients for obtaining the desired center frequency. Those filter coefficients are set in a digital filter.

REFERENCES:
patent: 3746997 (1973-07-01), Willett et al.
patent: 4336501 (1982-06-01), Ishikawa et al.
patent: 4479257 (1984-10-01), Akiyama
patent: 4524422 (1985-06-01), Kasuga
patent: 4858225 (1989-08-01), deSantis
patent: 5136267 (1992-08-01), Cabot

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