Patent ID: 9626950
Date: 2017-04-18
CPC Classifications: G10K,H03F,H03G,H04S

Claim:
1. An audio system operable in a closed loop condition for establishing a preset transfer characteristic used for reduction of distortion when said system is operated in an open loop condition, said system comprising: an audio signal input; an amplifier coupled to said audio input and having an amplifier output; a speaker coupled to said amplifier output; a first configurable filter interposed between said audio signal input and said speaker imposing a transfer characteristic upon audio signals between said audio signal input and said speaker; a speaker output detector receiving sound from said speaker and producing a corresponding electrical speaker signal; a comparator coupled to said output detector, said first configurable filter and said audio signal input producing an error signal related to difference therebetween and adjusting said first configurable filter in a distortion correcting manner to provide a preset distortion corrective transfer characteristic; and a source of pink noise signals defining a predetermined pink noise signal output response characteristic and wherein said source of pink noise signals injects pink noise signals into said system and wherein said comparator compares said electrical speaker signal to said predetermined pink noise signal output response characteristic and adjusts said first configurable filter to produce said predetermined pink noise signal output response.