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This 19.8kHz tone is usually produced by emergency audio systems, at least in my case (modern office building in Prague). It's purpose is to comply with EN 54-16 standard which dictates that every emergency audio loop should be checked for integrity at least once per 100 seconds. This is usually done using ultrasonic frequency (where the impedance is high ...


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Sources for such a tone are DC/DC converters (these days, a whole lot of switching power supplies are likely candidates) and heating valves. CRT monitors are no longer en vogue so probably not involved unless you are working in some CAD/artwork department still employing them. If it's an entire office floor, you'll likely have several pieces of equipment ...


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NO. The TRRS connector on an iPhone (or any other brand of phone, for that matter) supports only MONO microphones. If you want to record stereo (or more channels) then you must use an external sound interface. There are some rather small ones that are suitable for use with a phone. For example the "IK Multimedia iRig Pro DUO 2-Channel Audio and MIDI ...


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There are many solutions to recording stereo (or "dual mono" if you wish) through the USB port into a phone or tablet or computer. You did not state a budget, but this looks pretty good to me.... http://www.ikmultimedia.com/products/irigproduo/


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Connecting the two microphones by means of the Y adaptor will connect the microphones electrically, so it may work up to a point (depending on the microphones), but: You will only be able (at best) to record the combined sound captured by both microphones, not each mic as a separate channel. Note however that if you are trying to go on a really low budget, ...


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I think you have some options: Get a Windows tablet You can keep using the tools you know if your projects are simple enough for the hardware within your budget. Both Ableton Live and FL Studio licenses permit installing on multiple (2 for Ableton) devices, even cross-platform. It looks like currently a £300 Lenovo Yoga 2 11.6 2.16 GHz, 4 GB RAM, 500 GB ...


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