This
technique, though functional and easy to produce,
resulted in the chipmunk effect, in which the vocal
effect and intelligibility were adversely effected
(Barron, 2004). Consequently, there was a desire
to improve the quality of the time-compressed
audio, while preserving the quality of the pitch
and intelligibility to create a more enjoyable
audio experience. The act of changing the tempo
while preserving the pitch is referred to as the
invariant timing hypothesis (Honing, 2006). This
hypothesis states that one cannot distinguish
between the quality of audio when there is a tempo
change. This hypothesis makes time-compressed
instruction a feasible method of instruction.
The next iteration of analog time-compression
technology involved removing small segments of
the speech signal (Miller & Lichlinder, 1950).
Thistechnique, though functional and easy to produce,resulted in the chipmunk effect, in which the vocaleffect and intelligibility were adversely effected(Barron, 2004). Consequently, there was a desireto improve the quality of the time-compressedaudio, while preserving the quality of the pitchand intelligibility to create a more enjoyableaudio experience. The act of changing the tempowhile preserving the pitch is referred to as theinvariant timing hypothesis (Honing, 2006). Thishypothesis states that one cannot distinguishbetween the quality of audio when there is a tempochange. This hypothesis makes time-compressedinstruction a feasible method of instruction.The next iteration of analog time-compressiontechnology involved removing small segments ofthe speech signal (Miller & Lichlinder, 1950).
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