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This paper proposed an improved audio quality metric via circular and flexible overlap. Based on the Power Spectrum Estimation via circular overlap, we use a novel circular overlap sub-frame to assess highly impaired audio. The relationship between the fraction of overlap and the metric of audio quality is also examined, and it has been proven that the accuracy of audio quality assessment increased with the fraction of overlap. By integrating circular and flexible overlap into ITU-R BS.1387, which is also known as Perceptual Evaluation of Audio Quality, our method can be applied to the quality assessment of highly impaired audio.