Patent ID: 9590581
Date: 2017-03-07
CPC Classifications: H03G,H04R

Claim:
1. A system for reducing distortion in an electrical source signal caused by harmonics generated by a main signal processing device, the source signal containing a plurality of elementary frequencies, each elementary frequency having an initial amplitude, comprising a pre-processor comprising a circuit for differentially changing the initial amplitudes of at least some of the plurality of elementary frequencies in the source signal, to generate a pre-processed output signal for input to the main signal processing device, each of the frequencies in the pre-processed output signal having a pre-processed amplitude, the pre-processed amplitudes of higher frequencies being increased from the corresponding initial frequencies more than the pre-processed amplitudes of lower frequencies are increased from the corresponding initial frequencies, or the pre-processed amplitudes of higher frequencies being decreased from the corresponding initial frequencies less than the pre-processed amplitudes of lower frequencies are decreased from the corresponding initial frequencies, or a combination thereof, and a post-processor comprising a circuit for differentially changing amplitudes of at least some of the elementary frequencies in the signal output by the main signal processing device to generate a post-processed output signal, each of the frequencies in the post-processed output signal corresponding to the at least some of the plurality of elementary frequencies having a post-processed amplitude, the post-processed amplitudes of higher frequencies being decreased more than the post-processed amplitudes of lower frequencies, or the post-processed amplitudes of higher frequencies being amplified less than the post-processed amplitudes of lower frequencies, or a combination thereof, whereby at least some harmonics generated by the main signal processing device are suppressed.