Telephone conference amplifiers, and telephone conference bridge

Details Telephone conference amplifiers, and telephone conference bridge Telephone conference amplifiers, and telephone conference bridge

1982-09-29

1984-08-21

Rubinson, G. Z.

H04M 356

Patent

active

044671431

ABSTRACT:
In a telephone conference bridge, a conference port amplifier comprises amplifying means for providing signal amplification in both directions, the direction of amplification of the amplifier being switchable such that amplification can be provided selectively in one or other direction of speech transmission, while signals applied in the reverse direction are attenuated. The amplifier is biased in such a manner that, in the absence of any speech signal, the direction of amplification provided by the amplifier is from the conference bridge towards a connected telephone line, and means for detecting the presence of a speech signal applied to the amplifier for transmission from the connected telephone line to the conference bridge is arranged to cause switching of the amplifier to reverse its direction of signal amplification. By this means, the signal to noise ratio experienced by each conferee connected to the conference bridge is reduced when the silent conference bus is in the quiescent condition. Preferably, the means providing attenuation of speech signals in a direction towards the conference bridge comprises a gating means for disconnecting the output of a corresponding amplification channel of the amplifier from a common conference bus. Thus, the directionally switched nature of the amplifier is exploited so as to avoid the interconnection loss which is normally inherent in a conference bridge.

REFERENCES:
patent: 3872262 (1975-03-01), Kerman
patent: 3991280 (1976-11-01), James et al.
patent: 4049920 (1977-09-01), Knollman
patent: 4139731 (1979-02-01), Hashemi et al.

Affiliated with

Also associated with

Rating

Telephone conference amplifiers, and telephone conference bridge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone conference amplifiers, and telephone conference bridge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone conference amplifiers, and telephone conference bridge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1937609