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An automatic word length determination method

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4 Author(s)
Cantin, M.-A. ; Ecole Polytech. de Montreal, Que., Canada ; Savaria, Y. ; Prodanos, D. ; Lavoie, P.

A method to determine the word length required by implementations of Digital Signal Processing (DSP) algorithms is presented. The method uses a C/C++ fixed-point simulation tool to model the impact of finite word length on overall accuracy. It finds a combination of quasi-optimum bit resolutions in arbitrary data flow graphs by computing dissimilarities between fixed-point and floating-point simulation results. The selected algorithm minimizes these dissimilarities and finds a combination of word lengths that meets objectives specified by the user. This method is applicable to a wide range of DSP algorithms. It was tested on 2 benchmarks, the fifth order elliptic filter and the Inverse Discrete Cosine Transform (IDCT), and arrived to known optimum solutions

Published in:

Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on  (Volume:5 )

Date of Conference:

2001

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