Patent ID: 6282296
Filing Date: 2001-08-28
Classification: H04R

Abstract:
An audio reproducing apparatus comprising:(a) a power amplifier;(b) a speaker unit which reproduces output signals from said power amplifier, said speaker unit having a minimum resonance frequency;(c) a first microphone;(d) a second microphone;(e) a low pass filter coupled to said first microphone, said low pass filter having a first cut-off frequency which is based on said minimum resonance frequency of said speaker unit;(f) a high pass filter coupled to said second microphone, said high pass filter having a second cut-off frequency which is based on said minimum resonance frequency of said speaker unit;(g) an adder for adding an output from said low pass filter and an output from said high pass filter to obtain an adder result;(h) a variable gain circuit providing an output signal to an input side of said power amplifier, said output signal being varied responsive to said adder result.