有限字長對自適應噪聲對消器輸出信噪比的限制
THE RESTRICTION ON OUTPUT SNR BY FINITE WORD LENGTH IN ADAPTIVE NOISE CANCELLER
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摘要: 本文討論了LMS自適應噪聲對消器的有限字長效應。推導了包括量化噪聲和截斷噪聲的輸出信噪比的理論公式。如果某個量化字長能反映出輸出弱信號的變化,輸出信噪比主要取決于自適應運算的字長。Abstract: The effects of finite word length in LMS adaptive noise canceller are discussed. The theoretical formula of output signal-to-noise ratio involving quantization noise and round-off noise are derived. If the variation of input weak signal can be reflected by certain word length, the output SNR mainly depends on the word length of adaptive operations.
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C. Caraiscos, B. Liu, IEEE Trons. on ASSP, ASSP-32 (1984)2, 34-41.[2]Neil J. Bershad, IEEE Trans. on ASSP, ASSP-37 (1989) 10, 1504-1512.[3]B. Widrow et al., Proc. IEEE, 63 (1975) 12, 1692-1716.[4]A. V. Oppenheim, R.W. Schafer, Digital Signal Processing, Prentice-Hall, Englewood Cliffs, N. J. (1975), Ch. 9. -
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