What is wideband audio

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While ISDN does have two parallel, digital voice channels, both channels still only have an analogue bandwidth of Hz to 3. Wideband audio extends this frequency range to 50 to 7, Hertz.

This allows deeper and higher speech tones to be transmitted over the phone line. HD voice calls significantly improve the natural sound and intelligibility of speech. It is much easier for the parties to understand what the other is saying, both in loud surroundings and in quiet conversations. Transmitting virtually the entire spectrum allows for better voice recognition and along with it identifying people.

Wideband audio is also beneficial for conference calls where several individuals may be talking at the same time. These predictive encoding techniques coupled with the limited frequency sampling result in a voice codec that poorly recreates Asian speakers because of the higher frequency content of many Asian dialects.

These narrowband codecs also do a poor job in the transmission and encoding of music. In an attempt to solve these problems, other codecs were defined that double the audio-frequency spectrum encoded. Wideband codecs sample frequencies up to 8KHz. By doubling the frequencies that are encoded, a truer representation of the speed or audio can be encoded and recreated on the remote end. As most speech can be represented with only 10KHz of frequency, these wideband codecs are able to more faithfully reproduce the original speech than narrowband codecs.

Music transmission also becomes possible using wideband codecs. The G Bit rates as low as With the largest G. To deliver the superior audio quality of wideband codecs, the algorithms used to implement these codecs typically are more computationally intensive and thus require more processing capacity for the VoIP endpoints.