103 Royalty-Free Audio Tracks for "Filtered Noise"

Non-functional tube radio warming up, making a loud 60hz hum with lots of harmonics. As a bonus it clicks off at the end. Zenith consoltone. Only because the faq says so: electro voice n/d 257a through impedance transformer into crappy gigabyte motherboard realtek high definition audio. 16bits, processed at 32bits. Audacity sound editor and/or driver wouldn't record mic level so it was very noisy after amplification. Filtered with a (mathematically equivalent) fft constructed whopping 64k length zero phase filter (blackman window) with 5 wavelength width bandpass at each harmonic from 60hz to 5,520hz. For some reason a fraction of some of the harmonics didn't get through so did another pass on the residual noise and mixed that in. Near the beginning there was a sort of brief duplicate signal that descended in pitch so it didn't make it through the filter. I added that bit in. Attenuated frequencies above 3. 6khz because they are pretty much noise, but removing them didn't sound right. Cleaned up the beginning a bit in various ways, cut it down to 15 sec and carefully appended the unfiltered "click" onto the end, which i denoised 12db with audacity's noise reduction.

Ambient sound akin to the bridge of a starship. Muted background hum with an overtone of air conditioning ducts. Pseudo-random high pitched blips occupy the soundstage. Could be used as an ambient sound loop for hi-tech / science fiction interiors such as a laboratory, a control room, or the bridge of a spacecraft. Created with two instances of flstudio 3x osc. One kicking out a pair of sinewaves plus noise for the background susurus (hum) and ventilation sound. Second 3x osc is set to produce two interfereing square waves for the blips, squeaks and buzzes. The background was notch filtered and bandpassed to mellow out the humming sound and reduce hiss. The blips were processed with flstudio equo, stereo enhance, fruity delay2 and fl pan-o-matic vst. Each blip was pasted by hand in a seemingly random but not too unpleasant pattern.

A filtered recording of me breathing into my microphone. Could easily be used for magic sounds or ghost noises.