Displaying DRM Log Id #3

Date & Time
UTC		 Frequency
kHz		 Broadcaster Site Broadcast Details Screen/Graph Audio Solar Indices
SF/A/K		 Log File Rcvr Loc
2003/12/15 00:00On Monday December 15 the DRM specification changed. This is probably the last chance to incorporate advances in audio coding techniques before the mass production of chips starts and the system becomes fixed.

The upgrades are mainly related to the audio source coding part of the standard. They increase the audio quality of the DRM system, and align it with existing, open, audio codec standards.

Specifically, the DRM system upgrades:

  • Change the SBR implementation to the MPEG-4 format
  • Replace the low complexity stereo tool with the parametric stereo tool
  • Introduce the combination of HVXC and CELP speech coders with SBR
  • Implement the MPEG-4 scalable syntax for the audio source coding