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In all modern communications, speech coding plays a very vital role. It is a basic element in the efficient use of BW and QoS issues. Many standard bodies generate a series of speech coders with different rate, quality and delay combinations. Most of these CODECs have been built for 7 languages not including the Arabic or its accents. In this paper an extensive performance testing is done on the G.723.1 and compared with the G711, &#x003BC;_law and AMR. The test is done for (English, Arabic and Cairo accent) from different speakers' gender. The assessment was developed using the PESQ algorithm and it has been proved that the speech quality is slightly degraded when using Arabic language or Cairo accent with G.723.1 or AMR coders. The main point is not only the slight degradation but also the less stability of the LP coders' performance when working with languages other than English.

C31. Performance Evaluation of Speech CODECs against the Change in the Spoken Language and Accent