Subjective Audio Quality Test — MPEG Lossless Coding

In 2005 I designed and supervised a subjective audio quality test of the MPEG-4 Lossless Coding standards. Both of these standards permit bit-exact recovery of the input signal with approximately 2:1 compression. The MPEG-4 SLS standard permits decoding of a variable number of bits so as to permit the decoded signal to vary from bit-exact lossless (decoding the most bits) to perceptually lossless (decoding the fewest bits). The reports, N7686     Verification Report on MPEG-4 ALS, and N7687 Verification Report on MPEG-4 SLS, are available at http://mpeg.chiariglione.org/standards/mpeg-4/audio.

Subjective Audio Quality Test — MPEG HE-AAC V2

In 2005 I designed and supervised a subjective audio quality test of the MPEG-4 High Efficiency Advance Audio Coding Version 2 technology. This technology is perhaps the most widely deployed MPEG Audio technology in that it is present in more than 8 billion smart phones worldwide. It delivers entertainment quality audio at bitrates as low as 32 kb/s for a stereo signal. The report, N7137 Listening Test Report on HE-AAC V2, is available at http://mpeg.chiariglione.org/standards/mpeg-4/audio.