bcarso
Well-known member
Does anyone in here have knowledge of the chips typically used in the speech-quality IR wireless microphone systems? From what I can gather products achieve about 75dB S/N with diffuse IR carriers at 2.06 and 2.56 MHz; the audio modulates the carrier frequency in the usual analog FM fashion---they are not digital signals.
Years ago I worked with a system for one-way wireless audio links and I recall some Sony parts inside. The link was fairly short-range, quasi-line-of-sight and at that often a bit flakey, and used a bank of Stanley near-IR emitters which had a cutoff frequency around 30MHz---the typical IR emitters in remotes are way too slow.
The receiver was typically noise-in-background-light limited if the photodiode preamp was even half-decent. Some form of diversity-reception might have helped but I don't believe was used.
Years ago I worked with a system for one-way wireless audio links and I recall some Sony parts inside. The link was fairly short-range, quasi-line-of-sight and at that often a bit flakey, and used a bank of Stanley near-IR emitters which had a cutoff frequency around 30MHz---the typical IR emitters in remotes are way too slow.
The receiver was typically noise-in-background-light limited if the photodiode preamp was even half-decent. Some form of diversity-reception might have helped but I don't believe was used.
