A laptop microphone that picks up the room, and no wish to buy hardware

The microphone built into a notebook is a compromise made for size. It sits behind a keyboard, it hears the fan, and it treats every voice as though it were arriving from a metre away. For a call it is tolerable; for anything that will be listened to twice, it is not. The obvious answer is a decent microphone, and the obvious objection is that a decent microphone costs money for something used twice a week.

There is already a microphone in the room, inside the phone in your pocket. The hardware is genuinely better: a proper capsule, positioned where it is spoken into rather than where a keyboard used to be. The only missing piece is a way to get that audio into the computer in real time, and MicYou is an open-source tool that exists to provide exactly that piece. It carries the phone's audio over Wi-Fi or USB and presents it to the computer as a microphone, so anything that can record from a microphone can use it.

The architecture is two parts. A phone application captures the audio, and a companion program on the computer receives it; once the two are paired, the input is available to everything else. It is built with a cross-platform framework and a modern declarative interface toolkit, which is why the same project covers Windows, macOS and Linux rather than being a Windows program with ports promised later.

Three ways to connect, for three different situations

Wi-Fi is the mode most people will use. Phone and computer join the same local network, the pairing is done inside the application, and the result is completely wireless – which is what makes it suitable for a meeting or a stream where the person speaking needs to move. Latency is low enough that in ordinary use it is not felt.

Where latency matters more, such as playing with other people online or recording in real time, USB mode is available. The audio travels over a cable using the standard debugging or accessory protocols, and both stability and latency are better than over Wi-Fi. Bluetooth is supported as well, but the latency is noticeably higher; it suits situations where real-time response is not the point, such as recording a voice-over that will be edited afterwards.

Processing that the phone would not do on its own

Passing sound through unchanged would be a smaller product. Three stages of processing run before the audio leaves: noise suppression removes the fan, the air conditioning and the background hum; automatic gain control keeps the level steady instead of letting it swing between too quiet and too loud; and de-reverb takes out the room reflection that makes a recording sound hollow in an empty space. The last of the three is the one that does most for intelligibility, because a phone placed on a desk in a bare room otherwise records the room as much as the voice.

To make the result usable everywhere, the output is routed through a virtual audio driver, which is what allows the system to treat it as an ordinary microphone device rather than as something only one application knows about. Sampling rate, channel count and audio format are adjustable, so the stream can be matched to what the receiving software expects instead of being resampled twice.

Three decisions that shape the result

The first is where the phone goes. Lying flat on a desk it picks up the desk; propped up closer to the speaker and angled toward the mouth, it behaves like a microphone on a stand. No processing stage can recover what was never captured, so placement does more for the result than any setting does.

The second is which connection to choose: Wi-Fi when moving around matters, USB for a fixed position and the lowest latency, Bluetooth only when the recording will be edited afterwards. The third is whether this is the right answer at all. For occasional recording it plainly is. For daily professional work, a purpose-built microphone remains a purpose-built microphone; this tool serves the large middle ground of people who already own the phone and would rather not add a fifth device to the desk.

The idea underneath is clever in a modest way: nothing new needs buying, only existing things need recombining. An older Android phone, this tool, and a Wi-Fi network add up to a wireless microphone system that costs nothing. Open source, cross-platform, with suppression and gain built in – if the laptop microphone has become intolerable, this is the cheapest solution that requires no additional hardware.