American signal t-128 and federal signal 2001 siren sounding in attack mode. These sirens are normally sounded in a steady tone for tornado warnings, but this rising and falling tone would be used for civil emergencies like an air raid or other attack on the city.
The dutch city of leiden has a test of its civil emergency alarm, at midday on the first monday of every month. Here is a distant recording of the alarm as it is heard in a leiden soundscape.
I bought my own fire alarm (i am an enthusiast) on ebay. I went into my garage to record it. And it didn't work. I tinkered with it a little and got it to work. And this is what it sounds like. Feel free to use with no credit.
Morceau d'improvisation à la guitare électrique par Arthur P. (11 ans et quelques) pour l'émission Culture(s) Numérique(s) numéro 11 (juin 2019) sur Radio Pluriel. Publié ici avec son accord.
Recorded at the office when it was raining. I didnt have any specific tool to record the room so i just brought my cell phone and i started recording. There is some noises when dragging the phone, but it you edit on audacity it wont be much of a problem.
This is the sound that you hear if you press the emergency button of an elevator for less that one second. This elevator is at upf poblenou campus, at the tanger building, where diverse research groups do their work.
I took a big metal box with tea leaves inside and applied constant rotating motion to it. Can be looped perhaps. Hint: it was recorded at 96 khz, try playing this at 41,1 khz, sounds interesting. Recorded with zoom h1. No postprocessing.
A 1khz wave, often used as an effect for a flatline, test pattern, censorship, etc. This one more for effect (such as a movie) than a test tone. This was built with a square waveform for maximum loudness.
