Patent ID: 7254092
Filing Date: 2007-08-07
Classification: G08B,G10K

Abstract:
1. A system to provide amplified sound at a predetermined location, comprising: an impulsive signal generator adapted to provide an electrical impulsive signal; a first acoustic projector coupled to the impulsive signal generator, disposed at a selected one of a first location and a second location, and adapted to transmit an acoustic impulsive signal in accordance with the electrical impulsive signal, wherein the acoustic impulsive signal has a time duration less than a time difference between two multipath sound arrivals for sound propagating between the first and second locations; a hydrophone disposed at the unselected one of the first location and the second location and adapted to provide a hydrophone signal in response to the acoustic impulsive signal; a waveform processor adapted to generate a time-reversed version of the hydrophone signal in accordance with a time-reversed acoustic impulsive response from the first location to the second location; and a second acoustic projector disposed at the first location and adapted to transmit an acoustic signal in accordance with the time-reversed version of the hydrophone signal, resulting in sound at the second location having at least one of a peak pressure substantially larger than a peak pressure apart from and proximate to the second location and an impulse area substantially larger than an impulse area apart from and proximate to the second location.