EUROSPEECH 2001 Scandinavia
7th European Conference on Speech Communication and Technology

Aalborg, Denmark
September 3-7, 2001


Rapid CODEC Adaptation for Cellular Phone Speech Recognition

Masaki Naito, Shingo Kuroiwa, Tsuneo Kato, Tohru Shimizu, Norio Higuchi

KDDI R&D Laboratories, Japan

Along with the popularization of cellular phone, it becomes important issue to improve recognition accuracy for cellular phone speech input. However, the distortion caused by current low-bit rate speech corder is nonlinear. Therefore, it is difficult to compensate these distortion by only applying conventional CMN which assuming distortion as stationary linear transfer on spectrum domain. In this paper, to improve the accuracy of speech recognition over cellular-phone network, we investigate the use of CODEC-dependent acoustic model and rapid CODEC-adaptation using model selection based on maximum likelihood criterion. These method reduce degradation of recognition performance due to difference in CODEC by 33%.

Full Paper

Bibliographic reference.  Naito, Masaki / Kuroiwa, Shingo / Kato, Tsuneo / Shimizu, Tohru / Higuchi, Norio (2001): "Rapid CODEC adaptation for cellular phone speech recognition", In EUROSPEECH-2001, 1099-1102.