Subjective Audio Quality Test — MPEG USAC

In the first part of 2011 I designed and supervised a subjective audio quality test of the Baseline Profile of MPEG-D Unified Speech and Audio Coding. The tests included speech, music and speech mixed with music, and covered a large range of bit rates from 8 to 96 kbps as well as both mono and stereo operating points. Depending on the listening test, 6 to 13 test sites participated with a commitment to use at least 8 listeners per test. This resulted in a large data set of more than 38000 individual scores. The report, N12232 Unified Speech and Audio Coding Verification Test Report, is available at