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P1652a - IEEE Standard for the Application of Free Field Acoustic Reference to Telephony Measurements Amendment a: Updated diffuse field graph and tables

A common acoustic reference point is needed for comparing electroacoustic performance of handset, headset, handsfree, and other kinds of telephone terminals. It is also needed for comparing telephone terminals with other devices such as loudspeakers, mobile communication devices, multimedia terminals, and consumer audio equipment. The free field and the diffuse field are two of the most appropriate reference points because the results relate closely to what is heard by the listener. Therefore, the free field or the diffuse field are more widely applicable reference points for telephony measurements than the traditional ERP (ear reference point).Replace Diffuse Field transformation (correction) curve and tables with new, more accurate data. Put new data in body of the standard, and delete Annex B (where current Diffuse Field data currently resides.)
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