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lores~ Reference

Resonant lowpass filter

lores~

Description

lores~ implements an inexpensive lowpass with an adjustment that lets you add a specified resonance. The middle inlet sets a kind of cutoff frequency, but the sharpness of the filter depends on the resonance passed in through the right inlet (0 is a little bit sharp and 1 as sharp as possible).

Examples

Specify cutoff frequency and resonance of lowpass filter

Arguments

cutoff [number]

Optional

A number sets the initial cutoff frequency. The default value is 0. If a signal is connected to the inlet, the argument corresponding to the inlet is ignored.

resonance [number]

Optional

A number sets the filter resonance. The default value is 0. If a signal is connected to the inlet, the argument corresponding to the inlet is ignored. A resonance of 0 is a little bit sharp and 1 is as sharp as possible.

Attributes

cutoff [float]

Sets the initial cutoff frequency.

resonance [float]

Sets the filter resonance. A resonance of 0 is a little bit sharp and 1 is as sharp as possible.

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]

g/s(set)

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]

g/s(set)

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]

g/s(set)

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

int

Arguments

cutoff-frequency/resonance [int]
An int can be sent in the middle or right inlets to change the cutoff frequency or resonance. If a signal is connected one of the inlets, a number received in that inlet is ignored. A resonance of 0 is a little bit sharp and 1 is as sharp as possible.

float

Arguments

cutoff-frequency/resonance [float]
float can be sent in the middle or right inlets to change the cutoff frequency or resonance. If a signal is connected one of the inlets, a number received in that inlet is ignored. A resonance of 0 is a little bit sharp and 1 is as sharp as possible.

clear

Clears the filter's memory. Since lores~ is a recursive filter, this message may be necessary to recover from blowups.

signal

In left inlet: Any signal to be filtered.

In middle inlet: Sets the lowpass filter cutoff frequency.

In right inlet: Sets a "resonance factor" between 0 (minimum resonance) and 1 (maximum resonance). Values very close to 1 may produce clipping with certain types of input signals.

Output

signal

The filtered input signal. The equation of the filter is

yn = scale * xn - c1 * yn-1 + c2 * yn-2

where scale, c1, and c2 are parameters calculated from the cutoff frequency and resonance factor.

See Also

Name Description
Sound Processing Techniques Sound Processing Techniques
biquad~ Two-pole, two-zero filter
buffir~ buffer-based FIR filter
comb~ Apply a comb filter effect
cross~ Third-order crossover filter
onepole~ Single-pole lowpass filter
svf~ State-variable filter with simultaneous outputs
reson~ Resonant bandpass filter
Audio Filtering Audio Filtering