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D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 The frequency response of the digital counterpart of this analog filter is periodic. Therefore.

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Presentation on theme: "D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 The frequency response of the digital counterpart of this analog filter is periodic. Therefore."— Presentation transcript:

1 D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 The frequency response of the digital counterpart of this analog filter is periodic. Therefore in the case of DSP filtering the frequencies in the analog input signal have to be restricted by analog filters so that they do not appear outside the shaded area.

2 D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 0 0 1 Frequency response 0.511.52 f/ f s Digitalfilter - uniform sampling f 0

3 D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 DASP filters of this type are unique as their frequency responses might be close to the responses of respective analog filter shown above. Therefore they are applicable for extraction of any frequency even if it exceeds the signal sampling rate many times.

4 D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 00.511.52 0 1 Frequency response f/f s Small sampling interval variance Digitalfilter - nonuniform sampling f 0

5 D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 While the DASP filter characteristic is good for the passband frequencies, not so well suppressed peaks may appear in the stopband area. More pronounced sampling irregularities help to suppress them.

6 D SP 00.511.52 0 1 Frequency response f/f s Analog filter f 0 f 0 00.511.52 0 1 Frequency response f/f s Large sampling interval variance

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