Patent ID: 6084974
Filing Date: 2000-07-04
Classification: H03G

Abstract:
A digital signal processing device comprising:receiving means for receiving a digital input signal to be processed, the digital input signal having a linear gain characteristic;logarithm conversion means for converting the input digital signal into logarithmic data, the logarithmic data having a non-linear gain characteristic;address generation means for generating a readout address based on the logarithmic data generated by said logarithm conversion means;memory means for storing a plurality of gain values on the basis of a predetermined gain characteristic, one of the plurality of gain values being read from the memory means as a chosen gain value in response to the readout address generated by said address generation means; andmultiplication means for multiplying the digital input signal by the chosen gain value to provide a digital output signal,wherein no multiplication is performed in generating the chosen gain value from the digital input signal.