Conference system with automatic speaker detection and speaker u

Details Conference system with automatic speaker detection and speaker u Conference system with automatic speaker detection and speaker u

1993-04-01

1995-04-04

Dwyer, James L.

Telephonic communications

Special services

Conferencing

379202, 379406, 379410, 379411, 370 62, 370 321, 381111, 381 95, 381 96, 36472410, H04M 120

Patent

active

054043972

ABSTRACT:
A conference system comprises speaker units (12) coupled to a central unit (14). The speaker unit (12) comprises an echo canceller (20) with an adaptive filter (38) having an impulse response of comparatively short duration. In a speech pause of the user of the speaker unit (12) the common listening signal (LS) of the conference system is applied to the loudspeaker (18). Of the sounds then picked up by the microphone (16) only those sounds are compensated which are produced by the loudspeaker (18) and which reach the microphone (16) directly and which reach the microphone (16) indirectly via reflections from nearby objects. These sounds have a comparatively short impulse response time and enable a comparatively simple adaptive filter (38) to be used. The other sounds picked up by the microphone (16) reach the microphone (16) via reflections from the walls of the conference space (10) in which the conference system is situated. The other sounds have a comparatively long impulse response time. For the purpose of automatic speech detection these other sounds do not require echo cancellation because they are the same for all the speaker units. Automatic speech detection is now accomplished if the signal strength of the compensated microphone signal (MCCS) produced by the echo canceller (20) exceeds the average signal level of the speaker units.

REFERENCES:
patent: 4302631 (1981-11-01), Shenoi et al.
patent: 4604501 (1986-08-01), Richmond et al.
patent: 4658425 (1987-04-01), Julstrom
patent: 4862449 (1989-08-01), Hoefkens et al.
patent: 5062102 (1991-10-01), Taguchi
patent: 5271057 (1993-12-01), Addeo et al.
W. Armbruster, "High Quality Hands-Free Telephony Using Voice Switching Optimised with Echo Cancellation", Signal Processing IV: Theories and Applications, 1988, pp. 495-498.

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