10 System Feature Overview
April 2011 68007024085
2.1.3.1 Digital Audio Coverage
The main difference between analog and digital coverage is how the audio quality degrades
throughout the coverage region. Analog audio degrades linearly throughout the region of
coverage, while digital audio quality performs more consistently in the same region of coverage. A
primary reason for the different degradation characteristics is the use of forward error correction
coding used in digital transmissions, which can accurately deliver both audio and data content with
virtually no loss over a far greater area.
It is this error protection that allows a MOTOTRBO system to provide consistent audio quality
throughout its coverage area. A comparable analog system can never offer such consistency. In
the MOTOTRBO system, the audio quality remains at a high level, because the error protection
minimizes the noise effect.
The figure below graphically illustrates the relationship of delivered system audio quality, while
comparing good to poor audio quality with strong to weak signal strength. Do note that
• In very strong signal areas the analog signal, because there is no processing, may
sound slightly better than the digital audio signal.
• Digital signals increase the effective coverage area above the minimally acceptable
audio quality level.
• Digital signals improve the quality and consistency of the audio throughout the effective
coverage area.
• Digital signals do not necessarily increase the total distance that an RF signal
propagates.
Figure 2-5 Comparison of Audio Quality versus Signal Strength for Analog and Digital
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