How well do LTE devices handle audio in public safety environments?

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How well do LTE devices handle audio in public safety environments?
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Although some LTE devices used for public safety purposes can outperform purpose-built public safety devices on audio quality, performance is uneven and there is plenty of room for improvement, the testing company found.
In benchmarking speech intelligibility on LTE devices, Spirent found that “phrase misunderstandings can occur in mission-critical communications scenarios up to almost 50 percent of the time, even when using devices that are marketed specifically for use by the public safety community.”
Spirent tested four devices that support public safety LTE; it did not disclose which devices or their manufacturers.
Modern-day MOS algorithms such as POLQA (Perceptual Objective Listening Quality Analysis) are “excellent at evaluating the quality of audio transmission, but they are not sufficient for public safety scenarios,” the company said, because first responders need to communicate in acoustically challenging environments with lots of background noise.
Speech intelligibility, on the other hand, is about the ability of a device to transmit all the critical components of speech in the presence of these background noises so that words and phrases can be easily understood,” Spirent explained.
Voice phrases were played out of Horatio’s mouth and captured by a device-under-test, while real-world recordings of background noise were played through speakers placed around the torso in order to create 360-degree sound reproduction, and upstream audio was recorded at the receiving end, the company said.
“In some typical first responder noisy environments, phrase misunderstanding occurred almost 50% of the time for some devices as compared to less than 10% of the time for others,” Spirent concluded

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