Patent ID: 6385314
Filing Date: 2002-05-07
Classification: H04Q

Abstract:
A control system for transmission devices each equipped with a high-efficiency coding scheme in a communication network in which a first transmission line through each of said transmission devices provided with a coding/decoding circuit for high-efficiency coding/deoding of an acoustic signal and a second transmission line not through said each transmission device are connected to one of a predetermined number of exchanges, CHARACTERIZED IN:that, in the case of starting the terminating of a transfer operation of a high-efficiency-coded acoustic signal from one of said predetermined number of exchanges, a type of high-efficiency coding scheme to be used and an identifier, which indicates that said acoustic signal has been coded or decoded by said high-efficiency coding scheme, are sent as processing information on said coded acoustic signal which is transferred from said one of said exchanges to a following exchange in said communication network, said processing information being contained in a call control signal indicative of a start of a call; and that each of said exchanges in said communication network, through which said coded acoustic signal passes in said transfer operation, uses said processing information transferred thereto to select said first transmission line or said second transmission line as an outgoing line so as to avoid degradation of the quality of said acoustic signal due to multi-stage coding and decoding for said high-efficiency coding scheme and to efficiently transfer said acoustic signal.