Patent ID: 7439884

Claim:
A sampling rate converter comprising: an up sampler for receiving an input signal at frequency Fsi and for inserting U- 1 zero points between sample signals and raising a sampling frequency U-fold to output an output signal at frequency UFsi, a convolution processing unit including an FIR filter and performing predetermined convolution processing with respect to the output signal of the up sampler, a linear interpolation block for selecting two points of samples with respect to the results of processing of the convolution processing unit and finding a value at a required position from the linear interpolation, and a low pass filter providing either low pass filtered sample signals to the up sampler, or low pass filtering signals output of the linear interpolation block, wherein the FIR filter of the convolution processing unit is an FIR filter where an impulse response is expressed by a finite time length, the impulse response becomes a filter coefficient, and a transmission function H(z) is associated with a transmission function Z(z) of the low pass filter, and the filter coefficient is set by performing weighted approximation with respect to a desired characteristic in relation to a frequency response of the low pass filter.