Perceptual Quality of Speech Transmitted via Fixed Satellite Link Using CS-ACELP and ATC Coding

In this paper, we present the results of our experimental investigations of correlation between the speech quality as per ITU-T proposed PSQM method, and the algorithms used for speech coding and transmitting over fixed satellite link with different levels of error performance. We considered both CS-ACELP and ATC coding algorithms at various bit rates, showing that, for satellite transmission channels, the coding efficiency and transmission speed are not the only and ultimate code selection criteria, but also the quality of the received signal, code delay, susceptibility to interferences and transmission errors. Finally, we consider the possibility of dynamic assigning of different coding algorithms (each with particular bit rate) conforming to currently achievable satellite channel bandwidth, taking into account current channel error performance (BER)