Dynamic digital IIR audio filter and method which provides dynam

Details Dynamic digital IIR audio filter and method which provides dynam Dynamic digital IIR audio filter and method which provides dynam

1990-08-29

1992-12-08

Nguyen, Long T.

Boots, shoes, and leggings

G06F 1531

Patent

active

051703696

ABSTRACT:
An improved dynamic digital IIR (Infinite Impulse Response) audio filter and method provides a remedy for the major problems in state of the art digital IIR filtering and dynamic digital filtering for audio. In particular, the required multiplier coefficient size is reduced, such that 16 bit coefficients are adequate for good frequency resolution. In addition, the data size of the multiplier is also reduced, to be similar to the input and output data resolution without inferior noise performance. Furthermore, the structure is easily modified to allow the fixing of the DC (Direct Current) gain of the IIR filter to unity regardless of coefficient choice, eliminating any problems with filter dynamic range at low frequency passbands. Additionally, a dynamic filter structure allows logarithmic filter sweeps and compresses the coefficients further down to as few as 8 bits with adequate resolution for audio throughout the band. The structure allows the alteration of sweep of the filter without excessive computation or the requirement to read the current sweep value.

REFERENCES:
patent: 4305133 (1981-12-01), Amada et al.
patent: 4563681 (1986-01-01), Godard
patent: 4569030 (1986-02-01), Butterweck et al.
patent: 4573135 (1986-02-01), Dieterich
patent: 4736333 (1988-04-01), Mead et al.
J. Dattorro, "The Implementation of Recursive Digital Filters for High-Fidelity Audio", Journal Audio Engineering Society, vol. 36, No. 11, Nov. 1988, pp. 851-878.

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