A newer version of Max is available. Click here to access the latest version of the documentation

filtercoeff~

Signal-rate filter coefficient generator

Description

The filtercoeff~ object is a signal-rate filter coefficient calculator for the biquad~ object. It calculates the filter coefficients from three higher-level parameters: frequency, amplitude and resonance (Q) or slope (S). Its internal calculations are based on those of the filtergraph~ object.

Examples

The filtercoeff~ object lets you send sample-accurate coefficients to biquad~

Arguments

default-filter-type [symbol]

Optional

A symbol argument may be used to set the default filter type (highpass, lowpass, etc...).

resampling-factor [int]

Optional

An optional second argument can be used to specify a resampling factor.

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.

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 [float]

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

filter-parameters [int]
Integer values are converted to float.

In 1st inlet: Sets the center or cutoff frequency parameter for the filter and causes output.

In 2nd inlet: Sets the gain parameter for the filter and causes output.

In 3rd inlet: Sets the Q (resonance) or S (slope) parameter for the filter and causes output. (note that the term slope is only used for the third parameter of shelving filters, and is roughly equivalent to resonance).

float

Arguments

filter-parameters [float]
In 1st inlet: Sets the center or cutoff frequency parameter for the filter and causes output.

In 2nd inlet: Sets the gain parameter for the filter and causes output.

In 3rd inlet: Sets the Q (resonance) or S (slope) parameter for the filter and causes output. (note that the term slope is only used for the third parameter of shelving filters, and is roughly equivalent to resonance)

list

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
A list of up to 3 floats will specify the center-frequency, the gain, and the Q-factor respectively. A signal connected to any inlet where these parameters would normally be received will override any input from a list and the effects of these parameters are completely dependent on what type of filter is chosen.

allpass

Arguments

center-frequency [float]
Q [float]
In left inlet: The word allpass sets the filter type to allpass mode. The frequency response of the filter is based on two parameters: center/cutoff frequency and Q (resonance). The gain parameter is set to unity gain (1.0). An allpass filter is designed to modify the phase response, leaving a flat amplitude response

bandpass

Arguments

center-frequency [float]
Q [float]
In left inlet: The word bandpass sets the filter type to bandpass mode. The frequency response of the filter is based on two parameters: center frequency and Q (resonance). The gain parameter is set to unity gain (1.0).

bandstop

Arguments

center-frequency [float]
Q [float]
In left inlet: The word bandstop sets the filter type to bandstop mode. The frequency response of the filter is based on two parameters: center frequency and Q (resonance). The gain parameter is set to unity gain (1.0).

gainapass

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word gainapass sets the filter type to allpass mode with user-controllable gain. The frequency response of the filter is based on three parameters: center/cutoff frequency, gain, and Q (resonance), although only the gain parameter has an effect on the amplitude response. An allpass filter is designed to modify the phase response, leaving a flat amplitude response

gainbpass

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word gainbpass sets the filter type to bandpass mode with user-controllable gain. The frequency response of the filter is based on three parameters: center frequency, gain, and Q (resonance).

gainbstop

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word gainbstop sets the filter type to bandstop mode with user-controllable gain. The frequency response of the filter is based on three parameters: center frequency, gain, and Q (resonance).

gainhpass

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word gainhpass sets the filter type to highpass mode with user-controllable gain. The frequency response of the filter is based on three parameters: cf (cutoff frequency) gain, and Q (resonance).

gainlpass

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word gainlpass sets the filter type to lowpass mode with user-controllable gain. The frequency response of the filter is based on three parameters: cf (cutoff frequency) gain, and Q (resonance).

gainresonant

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word gainrtesonant sets the filter type to resonant mode (resonant bandpass filter) with user-controllable gain. The frequency response of the filter is based on three parameters: center frequency, gain, and Q (resonance).

highpass

Arguments

center-frequency [float]
Q [float]
In left inlet: The word highpass sets the filter type to highpass mode. The frequency response of the filter is based on two parameters: cf (cutoff frequency) and Q (resonance). The gain parameter is set to unity gain (1.0).

highshelf

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word highshelf sets the filter type to highshelf mode. The frequency response of the filter is based on three parameters: cutoff frequency, gain, and S (slope).

lowpass

Arguments

center-frequency [float]
Q [float]
In left inlet: The word lowpass sets the filter type to lowpass mode. The frequency response of the filter is based on two parameters: cf (cutoff frequency) and Q (resonance). The gain parameter is set to unity gain (1.0).

lowshelf

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word lowshelf sets the filter type to lowshelf mode. The frequency response of the filter is based on three parameters: cutoff frequency, gain, and S (slope).

off

Arguments

filter-type [list]
In left inlet: The word off sets the filter type to off mode whereby the dry, unfiltered signal is passed to the outputs.

peaknotch

Arguments

center-frequency [float]
initial-gain [float]
Q [float]
In left inlet: The word peaknotch sets the filter type to peaknotch mode. The frequency response of the filter is based on three parameters: center/cutoff frequency, gain, and Q (resonance).

resamp

Arguments

resampling-factor [int]
Set the resampling factor

resonant

Arguments

center-frequency [float]
Q [float]
In left inlet: The word resonant sets the filter type to resonant mode (resonant bandpass filter). The frequency response of the filter is based on two parameters: center frequency and Q (resonance). The gain parameter is set to unity gain (1.0).

signal

In 1st inlet: Sets the center or cutoff frequency parameter for the filter and causes output.

In 2nd inlet: Sets the gain parameter for the filter and causes output.

In 3rd inlet: Sets the Q (resonance) or S (slope) parameter for the filter and causes output. (note that the term slope is only used for the third parameter of shelving filters, and is roughly equivalent to resonance)

Output

signal

The five signal outlets output signal-rate filter coefficients for the biquad~ object.

See Also

Name Description
Sound Processing Techniques Sound Processing Techniques
allpass~ Apply an allpass filter effect
biquad~ Two-pole, two-zero filter
cascade~ Cascaded series of biquad filters
delay~ Delay a signal
filtergraph~ Filter editor
lores~ Resonant lowpass filter
reson~ Resonant bandpass filter
teeth~ Comb filter with feedforward and feedback delay control
Audio Filtering Audio Filtering