Distance is one variable#
Sound from different people can arrive with different levels, directions and timing. A closer wearer may provide a stronger signal, but a nearby loud voice can still interfere. An acoustic setup should be assessed under realistic conditions rather than described as a perfect distance gate.
Use a fixed test phrase and compare normal wearing position with an intentionally changed position. Keep speaking style constant. For background sound, use a permitted, non-sensitive source rather than other people’s private conversation.
What a useful result contains#
Report microphone configuration, room, source positions, speech style and transcript errors. Include difficult cases, not only the cleanest clip. A clean demonstration can show that one setup worked; it does not establish a universal isolation radius.
Near-field capture concerns what enters the input stream. It is separate from canceling sound heard through speakers and from preventing other people from hearing the wearer. Those outcomes require different measurements and should have different documentation.