Signal processing devices normally filter the signal to reduce noise. Any filtering is likely to eliminate useful components of the signal too. A device for and method of signal processing is disclosed, wherein intrinsically clean signal cycles are selected for reproduction so that the processed signal retains components of all frequencies. A system that uses the disclosed device and the method for processing periodic physiological signals is also disclosed.信號處理裝置通常過濾信號以減小雜訊。任何濾波亦可能消除該信號之有用分量。本文揭示一種用於信號處理之裝置及信號處理之方法，其中選擇固有乾淨信號循環用於重現，使得該經處理之信號保留全部頻率之分量。本文亦揭示一種使用該所揭示之裝置之系統及用於處理週期性生理信號之方法。
