white noise
/ˌwaɪt ˈnɔɪz/noun
University
1
A random signal (or process) with a flat power spectral density; a signal with a power spectral density that has equal power in any band, at any centre frequency, having a given bandwidth.
2
Any nondescript noise used for background or to mask or drown out other noise.
3
Speech that goes ignored or uncomprehended.