Forward short-time Fourier transform UGen for a real-valued input signal.
The FFT size is equal to rows * columns. The output is a succession
of complex half-spectra, i.e. from DC to Nyquist.
XXX TODO: Depending on mode,
the output window size is either size + padding or size + padding + 2.
'''Warning:''' window parameter modulation is currently not working correctly (issue #30)
- Value parameters:
- columns
the input matrix number of columns
- in
the real signal to transform. If overlapping windows are desired, a
Slidingshould already have been applied to this signal, as well as multiplication with a window function.- mode
packing mode.
0(default) is standard "packed" mode, whereby the real part of the bin at Nyquist is stored in the imaginary slot of the DC. This mode allows perfect reconstruction with aReal2IFFTusing the same mode.1is "unpacked" mode, whereby the output windows are made two samples longer, so that the Nyquist bin is included in the very end. By definition, the imaginary parts of DC and Nyquist are zero. This mode allows perfect reconstruction with aReal2IFFTusing the same mode.2is "discarded" mode, whereby the Nyquist bin is omitted. While it doesn't allow a perfect reconstruction, this mode is useful for analysis, because the output window size is equal to the fft-size, and the imaginary part of DC is correctly zero'ed.- rows
the input matrix number of rows
- Companion:
- object