Multichannel Sound Reproduction Quality Improves with Angular Separation of Direct and Reflected Sounds - June 2015
Clean Audio for TV broadcast: An Object-Based Approach for Hearing-Impaired Viewers - April 2015
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Audio Quality on the Air in DAB Digital Radio in Norway
The same program heard on DAB at 128 kbit/s and 192 kbit/s has been compared with a high quality FM stereo signal. The result from informal listening tests is that there are audible impairments in the stereo imaging of high-frequency instruments, and in particular hi-hats at 128 kbit/s. Some examples of songs where this effect can be heard are given. The effect can be explained by spectral analysis of the output of a DAB radio which shows that at 128 kbit/s, 3 kHz is used as the switch frequency for the intensity stereo coding of the MPEG-I layer 2 encoder, effectively removing all phase information above this frequency. This degradation cannot be heard in a good quality FM stereo signal.
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