Patent ID: 6587729
Filing Date: 2003-07-01
Classification: A61N,H04B

Abstract:
An apparatus for communicating an audio signal a(t), comprising:an audio predistortion filter having a filter function As(f) for producing a first output signal a(t)As(t) from the audio signal a(t); means for adding a bias A to the first output signal, to produce a second output signal a(t)As(f)+A; a square root processor for producing a third output signal (a(t)As(f)+A)Â½ responsive to the second output signal; and a modulator for producing a double sideband output signal responsive to the third output signal, having a carrier frequency of &ohgr;c, and being mathematically described by (a(t)As(f)+A)Â½ sin(&ohgr;ct); and transmitting the double sideband output signal to a demodulator, whereby the audio signal a(t) is recovered from the double sideband output signal.