A TMS320C25-based multirate filter

Author

Chassaing, Rulph ; Peterson, Wayne A. ; Horning, Darrell W.

Author_Institution

Sch. of Eng., Roger Williams Coll., Bristol, RI, USA

Volume

10

Issue

5

fYear

1990

Firstpage

54

Lastpage

62

Abstract

A nine-octave multirate filter with one-third-octave band gain control is presented. The filter, developed as a DSP (digital signal processing) application, produces a random-noise spectrum from 10 Hz to 5 kHz with a controllable level in one-third-octave bands. Nine FIR (finite impulse response) bandpass filters processed at different sample rates and eight FIR low-pass interpolation filters provide shaped pseudorandom noise. Equipment includes the TI TMS320C25-based software development system and the TLC32041 analog interface chip. The design offers a significant saving in both data memory storage and processing time. The multirate filter program uses 1368 words of data memory, whereas an equivalent single rate would occupy 41 K words of data memory.<>

Keywords

band-pass filters; digital filters; digital signal processing chips; low-pass filters; 10 Hz to 5 kHz; FIR; TMS320C25-based multirate filter; analog interface chip; bandpass filters; data memory storage; digital signal processing; finite impulse response; gain control; low-pass interpolation filters; pseudorandom noise; random-noise spectrum; software development system; Application software; Band pass filters; Digital filters; Digital signal processing; Finite impulse response filter; Gain control; Interpolation; Low pass filters; Multi-stage noise shaping; Programming;

fLanguage

English

Journal_Title

Micro, IEEE

Publisher

ieee

ISSN

0272-1732

Type

jour

DOI

10.1109/40.60526

Filename

60526