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Pitch shifting is a sound recording technique in which the original pitch of a sound is raised or lowered. Effects units that raise or lower pitch by a pre-designated musical interval ( transposition ) are known as pitch shifters .
The computer algorithm allows frequency-domain modifications to a digital sound file (typically time expansion/compression and pitch shifting). At the heart of the phase vocoder is the short-time Fourier transform (STFT), typically coded using fast Fourier transforms .
For example, one could move the pitch of every note up by a perfect fifth, keeping the tempo the same. One can view this transposition as "pitch shifting", "shifting" each note up 7 keys on a piano keyboard, or adding a fixed amount on the Mel scale, or adding a fixed amount in linear pitch space. One can view the same transposition as ...
The transposition of a set A by n semitones is designated by T n (A), representing the addition of an integer n to each of the pitch class integers of the set A. [1] Thus the set (A) consisting of 0–1–2 transposed by 5 semitones is 5–6–7 (T 5 (A)) since 0 + 5 = 5, 1 + 5 = 6, and 2 + 5 = 7.
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The DigiTech Whammy uses digital processing to raise or lower the pitch of an audio signal by up to two octaves. [1] The degree of shift is controlled by a treadle. [2] Users can set pitch-shifting intervals, add harmony, or detune the signal for a chorus-like effect. [2] The first model was introduced in 1989. [2]
This type of pitch-shifting is associated with blues, rock, country and pop music. [3] The effect generally shifts the pitch over a wider range than axial pitch-shifting. It can produce vibrato as a cyclic variation in pitch, a single up-and-down swoop, or as a shift from one pitch to another that is then held.
Mandolin, lute and oud – Courses with pairs of identically-tuned strings, as opposed to octaves and unisons on the 12-string guitar. Accordion – two or three reed blocks tuned to nearly the same pitch, but with one a bit sharp, produce a unique and distinctive "musette" sound exclusive to the accordion, colloquially called a "wet" sound.