Teleconference system using expanders for emphasizing a desired

Details Teleconference system using expanders for emphasizing a desired Teleconference system using expanders for emphasizing a desired

1987-07-31

1989-08-22

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

379206, 381 94, H03G 700

Patent

active

048603660

ABSTRACT:
A teleconference system comprises a plurality of microphones and a plurality of expanders connected respectively thereto for expanding the outputs of the microphones. A summing ammplifier produces a sum of the output signals of the expanders and feeds a compressor to compress the sum for transmission to a distant conference location. A desired signal from a given microphone has a higher level than undesired signals which may be detected by adjacent microphones, so it is emphasized by the associated expander with respect to the undesired signals. The compressor provides compression of the high- and low-level components of the sum in equal proportions so that the former is converted to a replica of the desired signal and the latter is suppressed to acceptable levels.

REFERENCES:
patent: 3026374 (1962-03-01), Hilliard et al.
patent: 4008376 (1977-02-01), Flanagan et al.

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