NTT DoCoMo develops technology that enables overwhelmingly high-quality phone calls close to real voice

It seems to be a system that enables overwhelmingly high-quality calling over conventional mobile phones. This makes it possible to have realistic conversation close to real voice.

There is a merit to those who frequently talk on mobile phones when they are put to practical use because there are many cases that listening mistakes and the other party 's voice can be heard differently than usual in the current tone quality.

Details are as follows.
Press release presentation: Develop high-quality sound coding technology | Notice | NTT DoCoMo

According to this release, the voice is converted (encoded) into a digital form when talking with a cellular phone, but in the past it was converting sounds of frequencies from 300 Hz to 3.4 kHz into digital form , The newly developed technology will be able to convert sound of frequencies from 50 Hz to 16 kHz. This seems that the frequency included in human voice is almost completely covered.

With new technology you will feel like this. It covers a much wider frequency than before.


Based on the characteristics of human auditory sense, the smaller the sound, the more precisely it will be encoded.


This makes it possible to realize a conversation close to real voice with a realistic feeling with mobile phones, and that the conversation with family and friends will be realistic, making almost no consciousness of talking on mobile phones. By the way, it seems that digital conversion with new technology can be done with the same amount of information processing as conventional technology.

By the way, according to the following link, it seems that this technique can reproduce sounds quite similar to real voice, because it seems that human hearing has individual differences, but it seems to be able to hear sounds with frequencies from 20 Hz to 15000 Hz to 20000 Hz. When is practical use?

Auditory - Wikipedia

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