Sampling rate converter

摘要

A sampling rate converter includes an arithmetic circuit for performing digital filtering processing for sampling rate conversion, and a circuit for calculating a sampling rate ratio. A memory circuit stores a plurality of groups of filter coefficients which are used in the digital filtering processing performed in the arithmetic circuit, corresponding to a plurality of sampling rate ratio ranges. A select circuit selects a filter coefficient group corresponding to the sampling rate ratio. The select circuit is arranged such that even if the sampling rate ratio is outside a sampling rate ratio range corresponding to a filter coefficient group selected at the present time, the select circuit continues to select the filter coefficient group selected at this time as long as the sampling rate ratio is within a predetermined range outside the sampling rate ratio range.