In acoustics and audio, a transient is a high amplitude, short-duration sound at the beginning of a waveform that occurs in phenomena such as musical sounds, noises or speech. Transients do not necessarily directly depend on the frequency of the tone they initiate. It contains a high degree of non-periodic components and a higher magnitude of high frequencies than the harmonic content of that sound.
Transients are more difficult to encode with many audio compression algorithms, causing pre-echo.
The term transient is used by military sonar operators to describe unexpected sounds emanating from another vessel such as operating machinery, a metal hatch being slammed, or the flooding and pressurization of torpedo or vertical launch tubes.
- Prefix (acoustics)
- Impulse function
- Onset (audio)
- Transient response – a common electrical engineering term that may be the source of the idea of an acoustic "transient"
- ^ Crocker, Malcolm J. (ed); Stepanishen, Peter (1998). Handbook of Acoustics. NY: John Wiley and Sons, Inc. p. 119. ISBN 0-471-25293-X.
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- ^ Gibson, William A. (2007). The Ultimate Live Sound Operator's Handbook. NY: Hal Leonard Books. p. 49. ISBN 978-1-4234-1971-6.
- ^ "Transient Detection and Editing".
- ^ Painter, Ted; Spanias, Andreas (April 2000). "Perceptual Coding of Digital Audio". IEEE. 88 (4): 471–474. doi:10.1109/5.842996. S2CID 1390521.