Abstract
This chapter discusses the Logarithmic Number System (LNS) and some aspects of its impact on signal processing hardware. The use of LNS leads to efficient precision versus dynamic range trade-offs, reduced complexity of certain arithmetic operations, and superior roundoff error behavior compared to linear arithmetic. In order to fully exploit the LNS potential, certain design parameters have to be optimally defined, so that the complexity of awkward operations, such as addition and subtraction, remains moderate. Furthermore retiming can efficiently optimize certain LNS circuits characterized by imbalanced paths. Benefits due to LNS are reviewed for FIR filter implementations and other DSP algorithms.
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