Time-stretching
时间缩放/Shi2 Jian1 Suo1 Fang4
n/a
CHEARS: False
EARS: True
CMT: False
EARS2 Encyclopedia: True
CHEARS:
EARS:
A DSP operation initially designed to stretch soundfiles in their duration, ideally without affecting their pitch (or pitches). This is the same proceedure that allows pitch transpositions without changes in the soundfile's duration (pitch-shifting). When applied exaggeratedly to complex events, time-stretching abandons its initial goal of changing duration to that of creating less predictable events recalling Pierre Schaeffer's experience in 'Les Seuils Temporels de l'Oreille'. This relates to what I call 'non-linear response' of electroacoustic equipment. (Source - Rodolfo Caesar (1992). The Composition of Electroacoustic Music. PhD Thesis, University of East Anglia.)
EARS 2:
A manipulation in which the Duration of a sound is altered. Time stretching can be used to make sounds longer or shorter.
Time-stretching can be done on its own using digital technology, or can be linked with pitch-shifting as it was with analogue technology (for example as in playing a record at the wrong speed).
[In digital music, time stretching and compression involve the elongation or reduction of a recording without changing its pitch. Whilst using tapes, the pitch rose or descended according to the amount of increased or decreased speed.]
Large-scale stretching can lead to granular textures; large-scale compression can lead to the source becoming masked.
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