Sliding Discrete Fourier Transform

The page is under continuing develoment to present sound files and code for the Sliding Discrete Fourier Transform as additional information to the paper in ICMC2005, and for the Sliding Phase Vocoder described at ICMC2007.

• An original drum loop
• The same loop after shift of 1.2 with SDFT using the Csound input
• and with standard phase vocoder

Sliding Phase Vocoder

The overhead projected slides for the presentation at ICMC2007 are available here.

In the following, all examples begin with source sound. Example 1,2: source from Csound book ("late_show.aif") and examples 3 through 5 are from the EBU SQAM set (converted to mono) : http://sound.media.mit.edu/mpeg4/audio/sqam/

• Musical example 1: A "standard" multiplicative pitch shift using SPV (N=1024, 2048).
• Musical example 2: A pure additive shift (500Hz) with SPV (compressed frequency ratios, tight drums).
• Musical example 3: Trumpet sound with Frequency Modulation using SPV.
• Musical example 4: A glockenspiel followed by two different downward harmonic shifts using SPV, and finally all three played together.
• Musical example 5: A horn with two time-varying TFM (Transformational FM) transformations.

Constant Q Sliding

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