Patent ID: 7587291

Claim:
A time-reversal method of focusing acoustic signals at a desired location in a media comprising steps as follows: (a) providing at least one radiating transducer adapted to emit acoustic signals to said media, said radiating transducer driven by a control system, (b) providing a sensor at said desired location to record response signals resulting from said acoustic signals arriving to said location in said media from said radiating transducer, said sensor connected to said control system to transmit said response signals thereto, (c) emitting an acoustic signal from said radiating transducer, (d) recording a response signal by said sensor, (e) computing a spectrum-adjusted signal based on said emitted and recorded signals, said spectrum-adjusted signal including attenuated spectral components with high amplitude and amplified spectral components with low amplitude, leading to flattening of the spectra of said signal and widening of its frequency band, (f) emitting said spectrum-adjusted signal from said radiating transducer, (g) recording a spectrum-adjusted response to said spectrum-adjusted emitted signal by said sensor, (h) computing a pseudo-impulse response from said spectrum-adjusted received and radiated acoustic signals, (i) time-reversing said pseudo-impulse response, and (j) storing said time-reversed signal for subsequent application thereof to said radiating transducer to provide focusing of acoustic signals at said desired location.