That's the problem. It would require some kind of new fuzzy signature algorithm, which works on information content in speech, rather than raw audio data. In th

That's the problem. It would require some kind of new fuzzy signature algorithm, which works on information content in speech, rather than raw audio data. In this case, exact matching of data isn't important, but major changes in information, so that changing / removing / adding words wouldn't be possible. Simple way would be to just convert speech to text first with a known method, so that both microphones could work from the same source data. The display device could actually show real-time transcription of the speech along with the signatures.