Differences between analogue and DMR audio.

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DMR equipment manufacturers have standardized on the AMBE+2 vocoder from DVSI Inc. to digitize and compress speech, allowing it to be sent over the air, using very little bandwidth. When migrating from analogue to MOTOTRBO, here is what users can expect in terms of audio performance and fidelity:

What users will and will not experience when migrating to digital
Users will experience Users will not experience
Background noise reduction Improvement in audio clarity
Better readability in poor signal areas Analogue-like speech reproduction
Low bandwidth digital audio MP3-like performance

Analogue radios were very tolerant to distorted audio (e.g. shouting or talking away from the microphone) and this allowed poor usage habits to perpetuate. All DMR radios require some degree of user discipline and careful consideration of the CPS settings – a qualified and trained technician can assist with optimal settings and accessories for the customer.[1]

See Also

This video illustrates the above differences.


  1. MOTOTRBO System Planner 68007024085-PA. Retrieved 30.01.2024.