Voice signal transmitting method and exchange system using this

Details Voice signal transmitting method and exchange system using this Voice signal transmitting method and exchange system using this

H - Electricity

04

L

H04L 12/56 (2006.01) H04J 3/16 (2006.01) H04L 12/20 (2006.01) H04L 12/64 (2006.01) H04M 7/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2209946

This relates to a voice signal transmitting method and exchange system using this whereby excellent speech quality can be maintained by reducing the celling delay on voice compression and celling/decelling delay on relay-exchanging. Voice compression/framing/celling units 20A, 20B, 20C corresponding to ATM exchanges 10A, 10B, 10C within the network are provided. When a call is made between telephone set 50-1 and telephone set 50-3 or 50-5, voice compression/framing/celling unit 20A distributes the voice signal that is input from PBX 30A to each remote party PBX 30B, 30C; the voice signal distributed to each of these remote stations is compressed, and, at fixed time intervals, only busy channels are multiplexed on to a variable-length TDM frame, this multiplexed frame being then converted into ATM cell form at each PBX 30B, 30C and transferred from ATM exchange 10A to ATM exchange 10B or 10C.

L'invention est constituée par une méthode de transmission de signaux vocaux et un central utilisant cette méthode qui permet de maintenir une excellente qualité dans les transmissions vocales en réduisant le retard de mise en cellule dans les compressions vocales et le retard de mise en cellule et d'extraction dans les échanges entre relais. Des unités de compression vocale, de mise en bloc et de mise en cellule 20A, 20B, 20C correspondant à des centraux MTA 10A, 10B, 10C du réseau sont fournies. Quand un appel est établit entre un poste téléphonique 50-1 et un poste téléphonique 50-3 ou 50-5, l'unité de compression vocale, de mise en bloc et de mise en cellule 20A distribue le signal vocal qui est transmis de chaque PBX 30A à chaque PBX 30B, 30C de correspondant éloigné; le signal vocal distribué à chacune de ces stations éloignées est comprimé et, à intervalles de temps fixes, seuls les canaux occupés sont multiplexés sur un bloc MRT de longueur variable qui est ensuite converti en cellule MTA à chaque PBX 30B, 30C, puis est transféré du central MTA 10A au central MTA 10B ou 10C.

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