Frequency warping in the design and implementation of fixed-point audio equalizers

Author

Asavathiratham, Chalee ; Beckmann, Paul E. ; Oppenheim, Alan K.

Author_Institution

MIT, Cambridge, MA, USA

fYear

1999

fDate

1999

Firstpage

55

Lastpage

58

Abstract

This paper discusses the use of frequency warping for designing and implementing a class of discrete-time filters. This technique is particularly useful for audio filters because specifications are often given on a logarithmic frequency scale. It is shown that frequency warping allows a class of recursive filters to be designed using standard FIR techniques, and naturally leads to a structure for implementing the filters. The fixed-point behavior of this filter structure is analyzed and is shown to be relatively insensitive to coefficient quantization and round-off noise

Keywords

FIR filters; acoustic noise; audio signal processing; discrete time filters; equalisers; quantisation (signal); recursive filters; audio filters; coefficient quantization; design; discrete-time filters; fixed-point audio equalizers; frequency warping; implementation; logarithmic frequency scale; recursive filters; round-off noise; specifications; speech applications; standard FIR techniques; Acoustics; Algorithm design and analysis; Chebyshev approximation; Equalizers; Finite impulse response filter; Frequency; IIR filters; Quantization; Robustness; Speech;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Signal Processing to Audio and Acoustics, 1999 IEEE Workshop on

Conference_Location

New Paltz, NY

Print_ISBN

0-7803-5612-8

Type

conf

DOI

10.1109/ASPAA.1999.810848

Filename

810848