MTN says expect clearer calls through HD Voice

MTN says it has become the first operator in South Africa to launch high definition voice (HD Voice) calling.

The group said that the adaptive Multi-Rate Wideband (AMR-WB) technology is available across its 3G network, nationally.

MTN customers can benefit from HD Voice if both the devices they use support AMR-WB to run a HD Voice active call.

HD voice extends the frequency range of signals transmitted over the radio air interface resulting in higher quality speech.

The range of the human voice extends from 80 Hz to 14 kHz but traditional, voiceband or narrowband telephone calls limit audio frequencies o the range of 300 Hz to 3.4 kHz, the operator said.

In comparison, AMR-WB technology extends the available audio frequency range to 50Hz to 7KHz with the additional low frequency range providing improved call naturalness, presence and comfort, and the higher range better sound differentiation and therefore higher call intelligibility.

Krishna Chetty, GM: Radio Optimisation & Planning at MTN South Africa, said HD Voice will give MTN subscribers superior audio feedback.

“Conversations on HD Voice will sound as natural and clear as if you are talking to someone in the same room. HD Voice reduces fatigue and makes for more intelligible conversations.”

“It enables clear conversations on many smartphone devices and gives users an optimal user experience which has, until now, been the sole preserve of fixed-line networks,” said Chetty.

He said the experience of changing from ordinary voice to HD Voice is comparable to switching from standard-definition to high-definition television (HDTV).

He said that computer-based processes like voice recognition and speech-to-text could also benefit from HD voice as it gives better accuracy.

MTN said that solution will not be available for the foreseeable future on the LTE and 2G network, as there are currently no voice calls on the new generation 4G network, and very limited handset support on the 2G network.

However, as the technology and device ecosystem matures this position could change, MTN said.

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MTN says expect clearer calls through HD Voice