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In the given text, the ESQ measure is described as follows: [pesq_mos]=pesqESQ measure-------------Usage of the PESQ objective measure is as follows: [pesq_mos]=pesq(cleanfile.wav,enhanced.wav) where cleanfile.wav contains the clean speech file and enhanced.wav contains the enhanced file. According to Loizou, P. (2007) in "Speech enhancement: Theory and Practice" published by CRC Press, the PESQ objective measure is widely used in speech enhancement research. If you have any questions, please feel free to email loizou@utdallas.edu.