Current Uses
In modern times, the main use of an AES (over an AEC) lies in the VoIP sector. This is primarily because AECs require a fast hardware, usually in the from of a Digital signal processor (DSP). For the PC market, and especially for the embedded VoIP market, this cost in MHZ comes at a premium. On embedded platforms, it is not unusual to find a Wideband CODEC (such as AMR-WB / G.722) incorporated in place of an AEC. This said, many (embedded) VoIP solutions do have a fully functional AEC.
Examples of AES in VoIP include: "X-Ten Eyebeam", X-Lite and Skype.
Read more about this topic: Echo Suppressor
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