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Sound Quality Degradation under Weak Field Conditions — Analog and Digital Propagation
Provided that the transmitter power is the same, the signal level at the receiver at a given distance will be the
same for a digital wireless and analog wireless system. This means that both systems can be said to have a
service area of the same size.
However, as explained in the preceding sections, the audio quality degradation behavior when field strength
becomes low is significantly different for digital wireless and analog wireless.
When compared at an equal transmitter power level, the following differences will occur as correlated to the
reception level.
There will be an area where 1) digital wireless retains high sound quality, 2) analog wireless suffers from
deteriorated audio S/N ratio.
There will be an area where 1) digital wireless starts to exhibit intermittent muting, 2) analog wireless has
lower S/N ratio but sound remains audible.
At the same power, the
propagation reach is the
same, but behavior in the
cut-off region is different.
The differences in sound quality degradation under weak field conditions may be experienced as a subjective
difference in service area size.
With WiDIF-HP, error processing has been optimized for a digital wireless system where intermittent muting
increases as the signal gets weaker. Operation patterns should be decided based on application
requirements and an evaluation of characteristics at the service area limit.
Because WiDIF-HP is tuned to maintain voice clarity as much as possible even when errors occur, evaluation
of error rates within the service area should be done using the Quality Level (QL) meter on the display of the
receiver or of the Wireless Studio application. The QL meter allows observation of transmission quality changes
over time.
Audio
dropout
Field strength
Digital
Analog
This graph shows a conceptual rendering.
It does not represent actual measurement
values.
Distance
17
WiDIF-HP Precautions
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