Issue No. 05 - September/October (1990 vol. 10)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/40.60526
<p>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.</p>
D. W. Horning, W. A. Peterson and R. Chassaing, "A TMS320C25-Based Multirate Filter," in IEEE Micro, vol. 10, no. , pp. 54-62, 1990.