Telecommunications company Ericsson has placed what it calls the first-ever HD call over a CDMA (Code Division Multiple Access) network.
HD calling, also known as wideband audio, has been available in Europe for some time over different network technology. Rather than calls being placed over the current 300Hz to 3400Hz spectral range, HD calls run on the 50Hz to 7000Hz spectral range. The result is a much higher quality of sound that improves fidelity of the human voice, which ranges from 80Hz to 14,000Hz. HD voice calls use the Enhanced Variable Rate Codec Narrowband-Wideband codec.
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