| 摘要 |
The invention provides a FIR filter calculation unit adapted for determining filter coefficients for a fractional delay FIR filter. From the sample values of a prototype filter's oversampled impulse response, at least two different subsets are extracted. In order to obtain a FIR filter with a predefined fractional time delay, an interpolation between the sample values of said different subsets is performed. The FIR filter calculation unit according to the invention can be used in a sampling rate converter. According to a respective fractional time delay between an input sample and the corresponding output sample, a suitable FIR filter for delaying the input sample is calculated. Next, convolutions of the input data stream with the interpolated filter coefficients of the respective FIR filters are performed. <IMAGE>
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