fftin~
Description
The fftin~ object provides an signal input to a patcher loaded by a pfft~ object.
Examples
Discussion
Where the pfft~ object manages the windowing and overlap of the incoming signal, fftin~ applies the windowing function (the envelope) and performs the Fast Fourier Transform.
Arguments
inlet-assignment [int]
Determines the inlet number of the pfft~ which will be routed into the fftin~ object. Inlet assignment starts at one, for the leftmost inlet in the pfft~. Multiple fftin~ objects will typically have different inlet numbers.
window-envelope-function [symbol]
Specifies the window envelope function the fftin~ object will apply to overlapping FFTs on the input signal. The options are square (i.e. no window envelope), hanning (the default), triangle, hamming and blackman (Note: The Blackman window should be used with an overlap of 4 or more). If the symbol nofft is used, then the fftin~ object will not use a windowing envelope and will not perform a Fast Fourier Transform -- it will echo the first half of its input sample window to its real output and the second half of its input sample window to its imaginary output. This can allow you to input raw control signals from outside the parent patcher through inlets in the pfft~ object, provided its overlap is set to 2. Other overlap values may not yield useful results.
Attributes
Common Box Attributes
annotation [symbol]
Sets the text that will be displayed in the Clue window when the user moves the mouse over the object.
background [int] (default: 0)
Adds or removes the object from the patcher's background layer. background 1 adds the object to the background layer, background 0 removes it. Objects in the background layer are shown behind all objects in the default foreground layer.
color [4 floats]
Sets the color for the object box outline.
fontface [int]
Sets the type style used by the object. The options are:
plain
bold
italic
bold italic
Possible values:
0 = 'regular'
1 = 'bold'
2 = 'italic'
3 = 'bold italic'
fontname [symbol]
Sets the object's font.
fontsize [float]
Sets the object's font size (in points).
Possible values:
'8'
'9'
'10'
'11'
'12'
'13'
'14'
'16'
'18'
'20'
'24'
'30'
'36'
'48'
'64'
'72'
hidden [int] (default: 0)
Toggles whether an object is hidden when the patcher is locked.
hint [symbol]
Sets the text that will be displayed in as a pop-up hint when the user moves the mouse over the object in a locked patcher.
ignoreclick [int] (default: 0)
Toggles whether an object ignores mouse clicks in a locked patcher.
jspainterfile [symbol]
JS Painter File
patching_rect [4 floats] (default: 0. 0. 100. 0.)
Sets the position and size of the object in the patcher window.
position [2 floats]
Sets the object's x and y position in both patching and presentation modes (if the object belongs to its patcher's presentation), leaving its size unchanged.
presentation [int] (default: 0)
Sets whether an object belongs to the patcher's presentation.
presentation_rect [4 floats] (default: 0. 0. 0. 0.)
Sets the x and y position and width and height of the object in the patcher's presentation, leaving its patching position unchanged.
rect [4 floats]
Sets the x and y position and width and height of the object in both patching and presentation modes (if the object belongs to its patcher's presentation).
size [2 floats]
Sets the object's width and height in both patching and presentation modes (if the object belongs to its patcher's presentation), leaving its position unchanged.
textcolor [4 floats]
Sets the color for the object's text in RGBA format.
textjustification [int]
Sets the justification for the object's text.
Possible values:
0 = 'left'
1 = 'center'
2 = 'right'
varname [symbol]
Sets the patcher's scripting name, which can be used to address the object by name in pattr, scripting messages to thispatcher, and the js object.
Messages
Output
signal
Out left outlet: This output contains the real-values resulting from the Fast Fourier transform performed on the corresponding inlet of the pfft~. This output frame is only half the size of the parent pfft~ object's FFT size because the spectrum of a real input signal is symmetrical and therefore half of it is redundant. The real and imaginary pairs for one spectrum are called a spectral frame.
Out middle outlet: This output contains the imaginary-values resulting from the Fast Fourier transform performed on the corresponding inlet of the pfft~. This output frame is only half the size of the parent pfft~ object's FFT size because the spectrum of a real input signal is symmetrical and therefore half of it is redundant. The real and imaginary pairs for one spectrum are called a spectral frame.
Out right outlet: A stream of samples corresponding to the index of the current bin whose data is being sent out the first two outlets. This is a number from 0 - (frame size - 1). The spectral frame size inside a pfft~ object's subpatch is equal to half the FFT window size.
See Also
| Name | Description |
|---|---|
| Spectral Processing | Spectral Processing |
| Sound Processing Techniques | Sound Processing Techniques |
| cartopol | Convert cartesian to polar coordinates |
| cartopol~ | Signal Cartesian to Polar coordinate conversion |
| fft~ | Fast Fourier transform |
| fftinfo~ | Report information about a patcher loaded by pfft~ |
| fftout~ | Output for a patcher loaded by pfft~ |
| frameaccum~ | Compute "running phase" of successive phase deviation frames |
| framedelta~ | Compute phase deviation between successive FFT frames |
| ifft~ | Inverse fast Fourier transform |
| in | Message input for a patcher loaded by poly~ or pfft~ |
| out | Message output for a patcher loaded by poly~ or pfft~ |
| pfft~ | Spectral processing manager for patchers |
| poltocar | Convert polar to cartesian coordinates |
| poltocar~ | Signal Polar to Cartesian coordinate conversion |
| vectral~ | Vector-based envelope follower |
| MSP Analysis Tutorial 4: Signal Processing with pfft~ | MSP Analysis Tutorial 4: Signal Processing with pfft~ |