AMR lets manufacturers create motherboards without analog I/O functions. Instead, these functions are placed on a separate card--with the codec chip--which plugs in perpendicular to the motherboard so that the motherboard and "riser" card form a right angle.
Separating the analog I/O functions from the motherboard means higher audio quality and reduced production delays. Prior to the AMR specification, motherboard analog I/O functions went through a lengthy FCC and international telecom certification process.
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