AT&T’s patent on narrowband HD upconversion

HD Voice News has discovered (well, stumbled upon) a patent AT&T filed in 2009 on a “system for bandwidth extension of narrowband speech.”

The patent can be found at and describes a method for taking a narrowband speech signal and then “synthesizing” a wideband signal. 

It is not clear what, if any, impact this patent would have on the various narrowband to wideband conversion products currently introduced on the market. 

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