Roundoff Noise in FIR Digital Filters and in FFT Calculations

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چکیده

FIR (finite impulse response) digital filters are open loop signal processors. These are numerical filters, and roundoff takes place within these filters when certain numerical operations are performed upon the filter input signals. Roundoff also takes place in IIR (infinite impulse response) digital filters. These are feedback filters, and the effects of quantization in IIR filters are more complicated than in FIR filters. We will defer discussion of the IIR case until the next chapter. This chapter focuses on quantization noise in FIR filters. Furthermore, we assume here that the coefficients of the filter are infinitely precisely given. In digital implementation, this will not be true – the consequences of finite precision in the coefficients are discussed in Chapter 21.

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تاریخ انتشار 2008