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It looks like the CDMA2000 and the GSM family variants of HD voice are not interoperable for the foreseeable future, so GSM calls to CDMA phones and vice versa will drop down to narrowband codecs that the current interoperability systems support. There are restrictions for currently available HD voice implementations, though.

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However, the HD voice upgrade is easier on the GSM side, since no massive equipment upgrades are required at the base station/tower side. AMR-WB and EVRC-NW offer largely the same benefits and have the same requirements. The audio channel for the base stations needs to be widened a bit to make room for the AMR-WB (Adaptive Multi-Rate Wideband) codec, though. On the GSM side of things (which includes 2G GSM, HSPA+, and LTE), HD voice is largely a core network upgrade. Additionally, the wideband codec actually goes up to 7KHz instead of 4KHz, offering slightly better audio recording capabilities. The new codec allows for properly encoding audio in the 50Hz-4KHz range at a 16KHz sampling rate, as opposed to half that for the older narrowband-only codec.

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Additionally, a multi-microphone noise canceling system is required to take full advantage of the codec. The EVRC-NW (Enhanced Variable Rate Codec вЂ“ Narrowband/Wideband) codec for CDMA2000 systems is a redesigned codec that can scale from the narrowband channel sizes currently supported in CDMA2000 to new wideband channel sizes provided in CDMA2000 1X Advanced. This new network infrastructure upgrade boosts capacity and range of a given cell by up to 70%, but more importantly it widens the 1X channel to about 300Kbps, giving more than enough room to support a brand new, higher quality audio codec. HD voice on CDMA2000 requires upgrading the 1X carrier to 1X Advanced.

However, this year is the year that device makers are finally being offered modem chipsets (from the likes of Qualcomm) that have full support for HD voice. In the last two years, the specifications for HD voice on CDMA2000, GSM, HSPA+, and LTE have been finalized.

Even better, governments around the world are now considering replacing traditional circuit-switched telephone networks (POTS) with optical fiber packet-switched VoIP networks.ДЇor cellular (and possibly hybrid cellular/satellite) networks, HD voice has been in development since 2000. With the transition to predominantly digital cellular/satellite communications, as opposed to the traditional terrestrial circuit-switched telephone network, HD voice became possible for telephony. However, most people do not consider Skype an HD voice platform because it is not a telephone system. Most people commonly experience HD voice when using VoIP platforms like Skype on their computers. Depending on the calling system being used, HD voice may or may not be available. HD voice is an umbrella term which refers to technologies that enhance the quality of an audio call, or the audio portion of a video call. But what is HD voice and what does it offer? For the first time in several years, voice calling is getting an upgrade. While the device is largely unexceptional - it is simply a modified version of the HTC One XL that is heading to AT&T - there is a particular feature that stands out: HD voice.

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Yesterday, Sprint and HTC announced the HTC Evo 4G LTE, the latest in the series of Evo phones from Sprint. This site may earn affiliate commissions from the links on this page.

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