Path change detector for echo cancellation
Periodic signal detector
Phase reversal tone detector using DSP
Phone privacy and unobtrusiveness via voice cancellation
Portable device case with corner protector
Portable speakerphone device and subsystem
Portable speakerphone device with selective mixing
Process for determining an echo coupling factor and the echo...
Process for echo suppression with adaptive fir filters
Process for improving the echo suppression in a...
Protecting an echo canceller against random transitions in...
Pure delay estimation