Title:
PARAMETRIC ARRAY MODULATION AND PROCESSING METHOD
Document Type and Number:
WIPO Patent Application WO2004019653
Kind Code:
A3
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.
Inventors:
POMPEI FRANK JOSEPH (US)
Application Number:
PCT/US2003/026998
Publication Date:
June 10, 2004
Filing Date:
August 26, 2003
Export Citation:
Assignee:
POMPEI FRANK JOSEPH (US)
International Classes:
G10K15/02; H03D9/00; H04B1/02; H04B3/00; H04B11/00; (IPC1-7): H04B3/00
Foreign References:
| US5220246A | 1993-06-15 | |||
| US6445804B1 | 2002-09-03 | |||
| US6151398A | 2000-11-21 |
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