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Current Analog Telephone Adaptors (ATA) which are commonly used by small business and home offices to implement Internet telephony applications are designed to work with an audio bandwidth of 300 Hz to 3.4 KHz, a holdover from the one hundred year history of telephone companies trying to accommodate a high volume of calls over copper. Recent network improvements in the last decade allow for a wider...
The restricted audio quality of today's telephone networks is mainly due to the narrowband (NB) limitation to the frequency range from about 300 Hz to 3.4 kHz. Meanwhile, codecs for wideband (WB) telephony (50 Hz to 7 kHz) exist with significantly improved speech intelligibility and naturalness. However, the broad introduction of wideband speech coding requires strong efforts of both network operators...
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