In This Section
Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
Accurate Calculation of Radiation and Diffraction from Loudspeaker Enclosures at Low Frequency - June 2013
New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
AES Journal Forum
Validation of ITU-T P.563 Single-Ended Objective Speech Quality Measurement
[Engineering Report] ITU-T Recommendation P.563 defines a single-ended method for objective speech quality assessment. The P.563 objective speech quality measurement method predicts the subjective absolute category rating (ACR) listening quality. The accuracy of the P.563 algorithm was tested against data from subjective listening tests. It was found that P.563 compresses the corresponding MOS (mean opinion score) value range for coded speech. For AMR coded speech with GSM and 3G radio channel errors, the MOS value range was from about 1.2 to 4.0, while the corresponding P.563 MOS-LQO range was from about 3.0 to 3.6. The quality of the modulated noise reference unit (MNRU) and direct samples was predicted better.
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