技術試験衛星V型(ETS-V)を用いた音声通信実験

抄録

This paper describes the voice communication experiment using the ETS-V and its results. Its objective is to develop and evaluate voice communication techniques for oceanic air traffic control (ATC) and ship operation management. The digital voice communication using a 2.4 kbps Linear Predictive Coding (LPC) and the analog voice communication using Narrow Band Frequency Modulation (NBFM) were used in the experiment. The voice quality was estimated by the typical method in which about 10 persons listened to the voice recorded at the receiving side and marked. The results show that the articulation score for LPC is about 60% (equivalent to the readability of 90%) for the C/No of more than 41 dBHz, much higher than the result for NBFM. It showed the superiority of the LPC digital voice over the typical analog voice communication in mobile voice communication.