Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 29, 2009
Patent Application Number
10525539
Date Filed
August 26, 2003
Patent Citations Received
Patent Primary Examiner
Patent abstract
A system using the nonlinearity of a propagation medium to demodulate an ultrasonic wave having audio modulated onto the ultrasonic frequency, audio signal processing circuitry providing a delayed audio signal and an envelope signal which is a function of peaks of the audio signal over a predetermined interval. The delayed audio signal and the envelope signals are combined with the delay in the audio allowing the envelope signal to accurately be aligned with the audio signal in the combination.
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