Parametric transmission for echo sounding and underwater communications involves maximising electroacoustic efficiency of transmission using switched power amplifiers

摘要

The method involves stimulating a parametric transmission sound transducer (1) with high frequency electrical primary signals (101-10n) selected in time characteristic and spectrum. Optimally matched transmission signal shapes and spectra are generated in the low frequency range using non-linear interactions in water at each output point. The electroacoustic efficiency of transmission is maximised by using switched power amplifiers (31-3n) with optimised drive signals and with broadband compensated sound transducers. An Independent claim is also included for an arrangement for implementing the method.