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This may be accomplished by time stretching and then resampling back to the original length. Alternatively, the frequency of the sinusoids in a sinusoidal model may be altered directly, and the signal reconstructed at the appropriate time scale. Transposing can be called frequency scaling or pitch shifting, depending on perspective.
In most musical instruments, the tone-generating component (a string or resonant column of air) vibrates at many frequencies simultaneously: a fundamental frequency that is usually perceived as the pitch of the note, and harmonics or overtones that are multiples of the fundamental frequency and whose wavelengths therefore divide the tone-generating region into simple fractional segments (1/2 ...
Transfigured Wind by American composer Roger Reynolds uses the phase vocoder to perform time-stretching of flute sounds. [8] The music of JoAnn Kuchera-Morin makes some of the earliest and most extensive use of phase vocoder transformations, such as in Dreampaths (1989).
Time stretching may refer to: Audio time stretching and pitch scaling, in audio; Time stretching, in video; Time dilation, in physics (relativity theory) Time stretch analog-to-digital converter, in electronics
Decoding of SBR requires transposing harmonics, a case of audio time stretching and pitch scaling. [10] A traditional approach starts with small intervals of discrete fourier transform (DFT), phase adjustments, IDFT, and ends with overlap-add. This method is sensitive to transient signals which can cause echos, requiring some padding (50% in ...
Pages for logged out editors learn more. Contributions; Talk; Time stretching (audio)
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The device's main ability was that it enabled the dissociation of pitch variation from time variation. This was the starting point for methods that would later become widely available using digital technology, for instance harmonising (transposing sound without modifying duration) and time stretching (modifying duration without pitch ...