H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 29/02 (2006.01) H04B 1/66 (2006.01) H04B 7/26 (2006.01) H04L 1/00 (2006.01) H04L 29/12 (2006.01)
Patent
CA 2244562
The station includes a coded speech signal source (10) having a given digital rate, modulating means (15,16) for producing a radio signal (SR) from the coded speech signal (SN) provided by the source, and a redundancy encoder (18) having a coding rate of the form K/N, where K and N are integers such that 0<K<N. Control means (20) select an operating mode of the station from at least a first operating mode where the modulating means (15) directly receive the coded speech signal (SN) and convert it into a radio signal occupying a determined fraction of time on a carrier frequency, and a second operating mode where the redundancy encoder (18) receives the coded speech signal (SN), and the modulating means (15) receive the output signal from the redundancy encoder and convert it into a radio signal occupying N/K times said determined fraction of time on a carrier frequency.
Une station comprend une source de signaux locaux codés (10) à débit numérique donné, un dispositif de modulation (15, 16) servant à produire un signal radio (SR) à partir du signal vocal codé (SN) fourni par la source, et un codeur à redondance (18) dont le débit de codage est de la forme K/N, où K et N sont des entiers tels que 0 < K < N. Un dispositif de commande (20) choisit le mode de fonctionnement de la station, ce mode pouvant être un premier mode où le dispositif de modulation (15) reçoit directement le signal vocal codé (SN) et le convertit en un signal radio occupant une fraction déterminée du temps sur une porteuse, ou un second mode de fonctionnement où le codeur à redondance (18) reçoit le signal vocal codé (SN) et le dispositif de modulation (15) reçoit le signal de sortie de ce codeur à redondance et le convertit en un signal radio occupant la porteuse durant une fraction du temps égale à N/K fois ladite fraction déterminée.
Fetherstonhaugh & Co.
Matra Nortel Communications
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