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Voice-Activated Half Duplex Echo Suppressor Disclosure Number: IPCOM000040551D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

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Bustini, L Roulier, G [+details]


The figure shows a schematic representation of a digital voice network. A and B locutors are both connected to the digital network and coders through hybrid transformers (HYB). The hybrid transformers convert each two-wire bidirectional path connected to each telephone set A and B into two unidirectionel paths connected to the digital network. Switches SW1 and SW2 are provided for enabling switching off either one of the unidirectional paths to avoid generation of a feedback or echo signal to either A or B. This is a rough but conventional operation called echo suppressing operation. One of locutors outgoing unidirectional paths is simply turned off based on its relative energy contents.