A pocket digital voice recorder is encoding the audio signal as a basic PCM digital file (WAV format) at a specific sampling rate. It may also compress this file to MP3 format, again at a different data rate.
To think that a wireless signal would end up entwined in tha audio signal would first require a decoding of the stray digital signal and then a mixing. It just wouldn’t happen with a digital signal imposed over an analog sample.
If the signal level (RF) of a digital transmission would be picked up, it would not be an analog voice you could interpret. It would be a digital “hash” in the background.
Bob 
