Beep used to censor. This sound was made on a computer. It is a half-second sine wave with a frequency of 1000 Hz. UCS Category: BEEP. Duration: 00:01.
Two-tone siren of the French Gendarmerie. Doppler-Fizeau effect of a passage from left to right, made by computer. No engine noise, it's up to you to choose the noise of your vehicle according to your project. UCS Category: VEHSirn. Duration: 00:20.
Singing a field cricket. Present in France, the field cricket digs a hole in the sunny plains and sings to seduce the female. UCS Category: ANMLInsc. Duration: 00:36.
Many frogs sing near a pond in the city center. Sound recording at 2 meters. Sound of a waterfall in the background. UCS Category: AMBSwmp. Duration: 02:29.
Civil siren of the "national alert signal", during tests on the first Wednesday of the month: 1 cycle of 5 periods (61 seconds).
This is a realistic montage made using this imperfect sound, so feel free to do the same to make your siren sound like what you have in mind: bigsoundbank.com/national-alert-signal-remalard-61-s3257.html. UCS Category: ALRMSirn. Duration: 01:46.