User:Johan G/Synthesising sounds with Audacity
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By synthesising sounds with Audacity, a free and open source audio editing software, one can add aircraft sounds that are relatively close to real sounds when (good) GNU GPL compatible sounds are hard to come by.
On sound
A word on decibels
Noise
Some tips when listening
The basic tools
Check sampling frequency!
Normalisation
Effect > Normalize... > x Remove dc offset, x max amplitude -3 dB > Preview > OK
Spectrum analysis
Analyze > Plot Spectrum...
Note dB axis!
Creating noise tracks
Generate > Noise... > White, 0.6, 5—10 seconds
Synthesising sound with FFT filter and white noise
Draw, listen and compare, rinse and repeat.
Aircraft sounds
Aerodynamic sounds
Wosh
Airframe
Wosh, squeak
Wings
Wosh, buffeting, mechanical vibrations, note about controlling Reynolds number with sound
Propeller
Engine sounds
Combustion, heat and turbulence
RPM, vibrations and overtones
Reciprocating engines
Jet engines
Tire sounds
Wosh, Brrrr, klonk
Mechanical sounds
Electro-acoustic sounds
Sound in the cockpit
Sound sources
Sound level
Fighter cockpits: 80—110 dB(A)
Attenuation in a flight helmet
Unwanted sound in analysed recordings
Wind noise
Crowds
Electrical interference
Related content
External links
- Audacity official web site
- Audacity Manual Contents on the Audacity wiki
- Kuronen, Pentti (2004). Military aviation noise – Noise-induced hearing impairment and noise protection (pdf). Published by Oulu University Press. Archived from the original on June 3, 2020. Retrieved Aug 26, 2020.