Title :
Transmission quality of hand-free audio teleconference services
Author :
Kishimoto, Naoto ; Ishimaru, Kaoru ; Takahashi, Kenzo
Author_Institution :
Electr. Commun. Lab., NTT, Tokyo, Japan
Abstract :
A discussion is presented of a quality assessment procedure for hand-free audio teleconference services, and an effective, subjective assessment system for overall speech quality evaluation is proposed. Simulated transmission impairments can be independently controlled due to the construction of the assessment system without voice processing equipment. Test results show the effectiveness of a mean opinion score for the services and the influence of room noise and talker echoes on speech quality. For quality design, the authors propose an equipment-independent echo performance measure. The conventional opinion equivalent SNR is available for quantization noise assessment.<>
Keywords :
interference (signal); quality control; teleconferencing; voice communication; equipment-independent echo performance measure; hand-free audio teleconference services; mean opinion score; quality assessment procedure; quality design; quantization noise assessment; room noise; speech quality evaluation; talker echoes; test results; transmission quality; Loudspeakers; Microphones; Noise level; Quality assessment; Quantization; Speech codecs; Speech enhancement; System testing; Teleconferencing; Telephone sets;
Conference_Titel :
Communications, 1988. ICC '88. Digital Technology - Spanning the Universe. Conference Record., IEEE International Conference on
Conference_Location :
Philadelphia, PA, USA
DOI :
10.1109/ICC.1988.13571
