K
Kenzo Itoh
Researcher at Nippon Telegraph and Telephone
Publications - 21
Citations - 550
Kenzo Itoh is an academic researcher from Nippon Telegraph and Telephone. The author has contributed to research in topics: Speech synthesis & Speech coding. The author has an hindex of 8, co-authored 21 publications receiving 538 citations.
Papers
More filters
Journal ArticleDOI
Pure delay effects on speech quality in telecommunications
Nobuhiko Kitawaki,Kenzo Itoh +1 more
TL;DR: The effect of transmission delay on speech quality in telecommunications is described, with human factors such as conversational mode and the talker's knowledge of the cause of delay taken into account.
Journal ArticleDOI
Objective quality evaluation for low-bit-rate speech coding systems
TL;DR: An LPC (linear predictive coding) cepstrum distance measure (CD) is introduced as an objective measure for estimating the subjective quality of speech signals and good correspondence between LPC CD and the subjectivequality, expressed in terms of both opinion equivalent Q and mean opinion score are shown.
Patent
Acoustic noise suppressor
Kenzo Itoh,Masahide Mizushima +1 more
TL;DR: In this paper, a power spectrum component and a phase component are extracted from an input signal by a frequency analysis part, while at the same time a check is made in a speech/non-speech identification part to see if the input signal is a speech signal or noise.
Journal ArticleDOI
Speech-quality assessment methods for speech-coding systems
Proceedings ArticleDOI
Comparison of objective speech quality measures for voiceband CODECs
TL;DR: Speech quality for voiceband CODECs was evaluated by subjective and objective quality measures and it was concluded that the LPC Cepstrum Distance measure had best correspondence to Mean Opinion Score, among the objective measures studied.