Hands-free communication method for a multichannel transmission

Details Hands-free communication method for a multichannel transmission Hands-free communication method for a multichannel transmission

1996-05-09

1999-05-04

Harvey, Minsun Oh

Electrical audio signal processing systems and devices

Dereverberators

381104, 379388, H04B 320

Patent

active

059012307

ABSTRACT:
With hands-free communication methods for stereophonic hands-free communication to transmit room acoustics, and with multichannel hands-free communication to reproduce different speaker locations at a conference table, the acoustical couplings between loudspeakers and microphones located in the room must especially be taken into consideration, in addition to the influence of ambient noise and the control of duplex communication situations. The n.sub.2 couplings take place in n-channel transmission systems. According to the invention, for each coupling, a coupling factor (dlm) is formed from the quotient of a short-term average value of the transmitted signal (ysam) assigned to a microphone, and the short-term average value of the received signal (xsam) assigned to a loudspeaker. With the coupling factor (dlm) weighted with the short-term average value (xsam), the transmission curve of a compander (1.1, 1.2) is automatically and briefly shifted in a way, so that ambient noise and echoes are suppressed in each transmission channel, and only the speech signal is transmitted.

REFERENCES:
patent: 4039753 (1977-08-01), Balogh et al.
patent: 4891837 (1990-01-01), Walker et al.
patent: 5359653 (1994-10-01), Walker
"A Compact Multi-Channel Echo Canceller with a Single Adaptive Filter Per Channel" by Hirano et al, pp. 1922-1925, Proc. ISCAD 1992, IEEE.

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