Sampling rate conversion device and method, and audio device

Details Sampling rate conversion device and method, and audio device Sampling rate conversion device and method, and audio device

2005-01-18

2008-10-21

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

C341S155000, C341S118000, C341S119000

Reexamination Certificate

active

07439884

ABSTRACT:
A sampling rate converter able to obtain an amplitude characteristic that passes any frequency and able to achieve a high precision conversion without depending upon a cutoff frequency, having an up sampler103for inserting (U-1) zero points between signals and raising a sampling frequency Fsi U-fold, a convolution processing unit104including an FIR filter and interpolating a value by convolution with respect to output signals of the up sampler, and a linear interpolation block105for selecting two points of samples from the output signal of the convolution processing unit104having a sampling frequency UFsi and finding the value at a required position from the linear interpolation, wherein the FIR filter has an impulse response becoming a filter coefficient, having a transmission function H(z) associated with a transmission function Z(z) of a pre-filter, and having a filter coefficient set by performing weighted approximation with respect to a desired characteristic associated with the frequency response of the pre-filter.

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