April 12, 2007
NTT DoCoMo Develops High-Quality Speech Coding Technology for Cell Phones
NTT DoCoMo, Inc. announced that in collaboration with DoCoMo Communications Laboratories USA, Inc., it has developed speech coding technology that provides exceptionally high-quality voice for mobile phones, yet only requires the low-level computing power of conventional mobile telephony technologies.
This new technology realizes 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 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.
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