HD Voice

A spectrogram (0-5000 Hz) of the sentence &quo...

A spectrogram (0-5000 Hz) of the sentence “it’s all Greek to me” spoken by a female voice (Image:en-us-it’s_all_Greek_to_me.ogg). (Photo credit: Wikipedia)

HD voice (or wideband audio) is a technology that delivers the full frequency range of the human voice.  Traditional telephony has delivered a narrowband voice transmission and only transmitted sounds between 300 Hz and 3.4 kHz. However, the human voice extends between 80 Hz and 14 kHz, so traditional telephone has chopped off parts of every voice transmission.

The range of frequency was curtailed for traditional telephony based upon the limited bandwidth available for transmitting voice calls over a twisted copper pair. But voice that is sent over an IP path does not have those limitations and can send the full range of the human voice.

There has been an industry standard for wideband voice since 1987. However, until recently the only uses of the standard were in high-end video conferencing systems and for transmitting sports announcers back to the home station for rebroadcast.

But the industry is starting to use the HD voice protocol for calls made over VoIP. For example, Skype and some other PC-to-PC voice providers use the full HD voice bandwidth and the higher quality of the call can be experienced by a caller using a high-quality headset or handset. These same calls don’t sound better when listened to on a standard phone due to limitations in the speakers. There are also a number of vendors offering wideband telephones such as Avaya, Cisco, Grandstream, Gigaset, Polycom and others. These sets are capable of both sending and receiving a wideband voice signal, but the phones at both ends must be wideband capable to engage in an HD quality call.

So what are the business opportunities with HD Voice? Businesses are interested in having high-quality calls, particularly in conference rooms, noisy areas and other places where the quality can make a difference. The business opportunity is to make the phones available to businesses that are served with IP voice paths. HD Voice can then be sold as an add-on feature or as a more expensive voice line. A company that wants the higher quality calling is a great candidate for moving off of traditional TDM services onto VoIP, IP Centrex or other IP voice solution.

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