1. A non-transitory computer-readable medium having stored thereon instructions executable by a computing device to perform functions comprising: receiving, via a microphone, a stream of audio data that includes (i) an audio signal component and (ii) a background noise component; as a subset of the stream is received, identifying, based on at least the subset of the stream, an error condition; and displaying, on a graphical display, a graphical representation that indicates the identified error condition.