Patent ID: 7903823
Filing Date: 2011-03-08
Classification: H04S

Abstract:
1. An apparatus for expanding sound stage representation of an audio system presenting two sound channels, the apparatus comprising: a first amplifier unit having a first inverting input terminal, a first non-inverting input terminal and a first output terminal; a second amplifier unit having a second inverting input terminal, a second non-inverting input terminal and a second output terminal; a right channel signal source coupled for providing a first right channel signal and a second right channel signal to the first amplifier unit; one right channel signal of the first and second right channel signals being provided to the first inverting input terminal, an other right channel signal of the first and second right channel signals being provided to the first non-inverting input terminal; a left channel signal source coupled for providing a first left channel signal and a second left channel signal to the second amplifier unit; one of the first and second left channel signals being provided to the second inverting input terminal, an other one of the first and second left channel signals being provided to the second non-inverting input terminal; a first filter unit coupled for providing filtered the one right channel signal to the second non-inverting input terminal; a second filter unit coupled for providing filtered the other right channel signal to the second inverting input terminal; a third filter unit coupled for providing filtered the one left channel signal to the first non-inverting input terminal; and a fourth filter unit coupled for providing filtered the other left channel signal to the first inverting input terminal.