NTT DoCoMo Develops High-Quality Speech Coding for Mobiles

NTT DoCoMo has developed speech coding technology that provides exceptionally high-quality voice for mobile phones. The technology uses a wide frequency range of 50Hz - 16kHz, which is approximately the full range of the human voice. By comparison, the frequency range of legacy telephony services is limited to 300Hz - 3.4kHz.



The speech compression is matched to the specific characteristics of human auditory perception, such as the fact that distortion in loud sounds is relatively imperceptible.



NTT DoCoMo said the resulting voice quality is so realistic that conversations via mobile phones sound as if the other person were in the same room. The technology will be especially helpful in mobile applications where voice quality is particularly critical, such as teleconferencing and remote education.



DoCoMo is demonstrating the technology using its "hTc Z" handset.



http://www.nttdocomo.com