Method and apparatus for peak detection of an analog signal

Abstract

A peak detecting device which can efficiently detect a peak of an analog signal in a smaller error for a short time without making a sampling frequency higher. The analog signal processing apparatus ( ) as the peak detecting device comprises: the frequency-dividing ratio setting device ( ) for outputting the frequency-dividing ratio setting signal ( ); the frequency divider ( ) for frequency-dividing the frequency of the reference clock signal ( ) by the frequency-dividing ratio which is changed by the frequency-dividing ratio setting signal ( ), to generate the sampling clock signal ( ); the A/D converter ( ) for carrying out the sampling of the analog input signal ( ) at the clock timing which is synchronized with the sampling clock signal ( ); the sampling data memory ( ) for memorizing the digital data ( ) which are obtained by sampling by the A/D converter ( ); and the data processor ( ) for reading out the digital data ( ) as the digital data ( ), to determine the peak of the digital data ( ).