Patent ID: 6785382
Filing Date: 2004-08-31
Classification: H04M

Abstract:
A speakerphone system comprising:an input signal path having a receive end connected to receive a far-talker signal and having a speaker end connected to a first transducer for generating an audible output in response to said far-talker signal; an output signal path having a microphone end connected to a second transducer for generating a near-talker signal, said output signal path having a transmission end connected to transmit said near-talker signal to a source of said far-talker signal; a first echo controller positioned along said input signal path, said first echo controller being configured to manage said level of said acoustic echo component of said near-talker signal, said first echo controller having dynamic filter characteristics that are preferential to passing high frequency components of said far-talker signal and that are dynamically selected on a basis of inhibiting said coupling of said audible output from said first transducer to said second transducer, said first echo controller being configured to manage variations in filtering different frequencies based on likelihoods of said different frequencies to induce said coupling; and a second echo controller positioned along said output signal path, said second echo controller being configured to manage a level of an acoustic echo component of said near-talker signal transmitted to said source, where said acoustic echo component is a consequence of coupling of said audible output of said first transducer to said second transducer.