FFT
Related Docs:
object FFT
| package ugen
The buffer to use for writing the FFT to. The size must
be a power of two. Since FFT operates at control rate
(also being a power of two), the buffer should probably
be at least as long as the control block size.
(init-time only)
The time domain signal to be transformed into the spectral domain.
A factor determining the step size between successive FFTs. That is, FFTs are performed every fftSize * hop sample frames. The default of 0.5 means thus a 50% overlap, while a hope of 1.0 means no overlapping. Choosing 0.0 will most likely crash the server! (init-time only)
The window function applied before each FFT is taken.
The default of 0 is a sine window which is good for
phase vocoder applications (using the PV_... UGens).
For analysis applications, you may want to use -1
which is a rectangle window (effectively no windowing)
or 1 which is a Hann window. A Hann window gives
perfect overlap-add reconstruction for a hope size of
0.5 (or 0.25 etc.) (init-time only)
This parameter can be temporarily set to <= 0 to pause the FFT operation.
With the default value of zero, the window size equals the fft size. If you wish to perform zero padding, an explicit window size can be specified. (init-time only)
This parameter can be temporarily set to <= 0 to pause the FFT operation.
The buffer to use for writing the FFT to.
The buffer to use for writing the FFT to. The size must
be a power of two. Since FFT operates at control rate
(also being a power of two), the buffer should probably
be at least as long as the control block size.
(init-time only)
A factor determining the step size between successive FFTs.
A factor determining the step size between successive FFTs. That is, FFTs are performed every fftSize * hop sample frames. The default of 0.5 means thus a 50% overlap, while a hope of 1.0 means no overlapping. Choosing 0.0 will most likely crash the server! (init-time only)
The time domain signal to be transformed into the spectral domain.
Abstract method which must be implemented by creating the actual UGens
during expansion.
With the default value of zero, the window size equals the fft size.
With the default value of zero, the window size equals the fft size. If you wish to perform zero padding, an explicit window size can be specified. (init-time only)
The window function applied before each FFT is taken.
The window function applied before each FFT is taken.
The default of 0 is a sine window which is good for
phase vocoder applications (using the PV_... UGens).
For analysis applications, you may want to use -1
which is a rectangle window (effectively no windowing)
or 1 which is a Hann window. A Hann window gives
perfect overlap-add reconstruction for a hope size of
0.5 (or 0.25 etc.) (init-time only)
A UGen performing short-time forward fourier transformations. In order to properly link the spectral ugens (
PV_...), you should begin by using the output of each UGen (which is just the fft buffer identifier), and use that as buffer input of the next UGen. That way, the UGen graph is correctly sorted. E.g.IFFT(PV_...(FFT(buf, in))).The UGen will initially output zero until the first FFT can be performed. This is the case after
hop * fftSize. Thus for a default fft buffer size of 1024 and ahopof 0.5, and for a default control block size of 64, for the first 1024*0.5/64 = 8 control blocks the UGen will output zero. This also implies that the first FFT in this case if performed on the first 512 samples of theinsignal (prepended by 512 zeros). In other words, the first 'full' FFT of the input happens after fftSize/controlBlockSize cycles, no matter what hop size was chosen.If you use FFT for performing signal analysis and not phase vocoder effects, make sure you change the window type accordingly.
The buffer to use for writing the FFT to. The size must be a power of two. Since
FFToperates at control rate (also being a power of two), the buffer should probably be at least as long as the control block size. (init-time only)The time domain signal to be transformed into the spectral domain.
A factor determining the step size between successive FFTs. That is, FFTs are performed every fftSize * hop sample frames. The default of 0.5 means thus a 50% overlap, while a hope of 1.0 means no overlapping. Choosing 0.0 will most likely crash the server! (init-time only)
The window function applied before each FFT is taken. The default of
0is a sine window which is good for phase vocoder applications (using thePV_...UGens). For analysis applications, you may want to use-1which is a rectangle window (effectively no windowing) or1which is a Hann window. A Hann window gives perfect overlap-add reconstruction for a hope size of 0.5 (or 0.25 etc.) (init-time only)This parameter can be temporarily set to <= 0 to pause the FFT operation.
With the default value of zero, the window size equals the fft size. If you wish to perform zero padding, an explicit window size can be specified. (init-time only)
FFTTrigger
IFFT