C/N Impact on Audio and Data Reception – Your Question Answered

C/N Impact on Audio and Data Reception – Your Question Answered

Our best specialists will respond in brief to your questions. We will post them regularly. Please submit them in writing and in audio with your picture and we will post the answers here. Please keep your questions short and relevant and send them to: projectoffice@drm.

In DRM you can have audio and images/animation in slide shows. So, what will be impact on the receiver C/N (carrier-to-noise), compared to audio only service? Will it be different?

M S Duhan

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DRM offers an on-air transmission platform, and it is up to the broadcaster how to partition the available overall capacity and assign bitrate for the individual ‘service components’ (such as audio and packet mode streams for data services such as SlideShow and Journaline). The broadcaster can assign a higher or lower protection level for every service component (affecting the required C/N for a reliable service).

The main difference between audio and data service components is that individual bit errors hardly affect the perceived quality (due to DRM’s powerful concealment technologies), while for data service components a single bit error may result in the loss of a whole slide (thus requiring the receiver to wait for the next transmission cycle). To take care of this special requirement of data service components, DRM offers the ‘enhanced packet mode’ configuration that adds forward-error-correction information for packet mode streams and thus allows a receiver to simply correct individual reception errors mathematically.