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NTT DoCoMo develops high-quality speech coding technology for mobile phones

April 3, 2007

1 Min Read

TOKYO -- NTT DoCoMo, Inc. announced today 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 technology employs speech compression that is matched to the specific characteristics of human auditory perception, such as the fact that distortion in loud sounds is relatively imperceptible. Moreover, the technology enhances sound quality to a remarkably high degree and processes coding with great efficiency.

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's "hTc Z" handset will be used to demonstrate a working version of the technology at "Telecom Summit Wireless Technology Park 2007" at the Pacifico Yokohama exhibition complex in Yokohama from April 4 to 5, 2007.


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