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There are a number of free sound effects resources of public domain or free content sound recordings appropriate for Wikipedia use available online, and as well as in other contexts. All files should be converted to ogg , Wikipedia's patent-free format of choice.
Black & Lane's Ident Tones for Surround (BLITS) is a way of keeping track of channels in a mixed surround-sound, stereo, and mono world. [1] It was developed by Martin Black and Keith Lane of Sky TV London in 2004. BLITS is used by Sky, the BBC and other European and US broadcasters to identify and lineup 5.1 broadcast circuits.
Graham's Line Identification Tone System (GLITS) is a test signal for stereo systems devised by BBC TV Sound Supervisor and Fellow of the IPS Graham Haines in the mid-1980s. It comprises a 1 kHz tone at 0 dBu (-18 dBFS ) on both channels, with interruptions which identify the channels.
A codec listening test is a scientific study designed to compare two or more lossy audio codecs, usually with respect to perceived fidelity or compression efficiency. Most tests take the form of a double-blind comparison.
Freesound is a collaborative repository of Creative Commons licensed audio samples, and non-profit organisation, with more than 500,000 sounds and effects (as of May 2021), [1] and 8 million registered users (as of March 2019).
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Many music files at Wikimedia Commons are from old vinyl records and therefore contain noise. Theoretically, such a file can be used to create another file from which the noise has been filtered, using a process called record restoration. Here is an example using GoldWave software:
The measured curves for pure tones, for instance, are different from those for random noise. The ear also responds less well to short bursts, below 100 to 200 ms, than to continuous sounds [ 1 ] such that a quasi-peak detector has been found to give the most representative results when noise contains click or bursts, as is often the case for ...