Digital Filter Algorithm Based on Whistle Sound Suppression System Design

System uses the voice codec chip analog voice signals TLV320AIC23 A/D conversion, digital audio is passed to the DSP chip TMS320VC5409 sequence processing, DSP algorithms using FFT and CZT transform algorithm the number of sequences of audio spectrum analysis, found that whistle frequency. IIR filter is filtering to produce the frequency of the whistle. Finally the number of sequences then filtered through voice codec chip TLV320AIC23 for D/A conversion, analog audio signals reduced to achieve the howling suppression purposes.