IN-HOUSE SOUND AMPLIFICATION SYSTEM, IN-HOUSE SOUND AMPLIFICATION METHOD, AND PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an in-house sound amplification system which can amplify sound, making it more natural and easier for people to understand than conventional ones, at a near-end side of the inside of a building, and also transmit such sound to a far-end side.;SOLUTION: An in-house sound amplification system adds received speech signals from a far-end side and signals based on speech signals acquired by sound acquisition means (amplification speech signals) by an adder to generate amplification signals, and performs voice communication with the far-end side by amplifying the generated amplification signals in a building by amplification means. The in-house sound amplification system comprises: a loss control system including a sound signal detector, a convergence determination device, and a loss controller; and an echo canceler including an echo path estimation device, an artificial echo generator, and a subtracter. The loss control system controls a signal level of the amplification speech signals according to a convergence state of echo path estimation. The echo canceler estimates an acoustic transmission characteristic vector between the amplification means and the sound acquisition means on the basis of the received speech signals from the far-end side and the amplification speech signals, to delete both acoustic echoes derived from the received speech signals from the far-end side and acoustic echoes derived from the amplification speech signals.;COPYRIGHT: (C)2013,JPO&INPIT