web.BiquadFilterNode — clojure-interop/cljs-web-api 1.0.0

The BiquadFilterNode interface represents a simple low-order and is created using the audio.AudioContext.createBiquadFilter() It is an audio.AudioNode that can represent different kinds filters, tone control devices, and graphic equalizers.

constructor cljs

Constructor.

The BiquadFilterNode() constructor of the Web Audio API creates a new web.BiquadFilterNode object, which represents a simple low-order filter, and is created using the AudioContext.createBiquadFilter() method.

Inherits parameters from the audio.AudioNodeOptions dictionary.

context A reference to an audio.AudioContext. options Optional Options are as follows:

type: One of "lowpass", "highpass", "bandpass", "lowshelf", "highshelf", "peaking", "notch", "allpass". The meaning of the other options depends on the value of this one. The defaults for all are as follows:

Q: 1 detune: 0 frequency: 350 gain: 0

lowpass: (Default) Allows frequencies below a cutoff frequency to pass through, and attenuates frequencies above the cutoff. This is a standard second-order resonant lowpass filter with 12dB/octave rolloff.

Q: Controls how peaked the response will be at the cutoff frequency. A large value makes the response more peaked. Please note that for this filter type, this value is not a traditional Q, but is a resonance value in decibels. frequency: The cutoff frequency. gain: Not used.

highpass: A highpass filter is the opposite of a lowpass filter. Frequencies above the cutoff frequency are passed through, but frequencies below the cutoff are attenuated. It implements a standard second-order resonant highpass filter with 12dB/octave rolloff.

Q: Controls how peaked the response will be at the cutoff frequency. A large value makes the response more peaked. Please note that for this filter type, this value is not a traditional Q, but is a resonance value in decibels. frequency: The cutoff frequency. gain: Not used.

bandpass: A bandpass filter allows a range of frequencies to pass through and attenuates the frequencies below and above this frequency range. It implements a second-order bandpass filter.

Q: Controls the width of the band. The width becomes narrower as the Q value increases. frequency: The center of the frequency band. gain: Not used.

lowshelf: The lowshelf filter allows all frequencies through, but adds a boost (or attenuation) to the lower frequencies. It implements a second-order lowshelf filter.

Q: Not used. frequency: The upper limit of the frequences where the boost, or attenuation, is applied. gain: The boost, in dB, to be applied. If the value is negative, the frequencies are attenuated.

highshelf: The highshelf filter is the opposite of the lowshelf filter and allows all frequencies through, but adds a boost to the higher frequencies. It implements a second-order highshelf filter.

Q: Not used. frequency: The lower limit of the frequences where the boost, or attenuation, is applied. gain: The boost, in dB, to be applied. If the value is negative, the frequencies are attenuated.

peaking: The peaking filter allows all frequencies through, adding a boost, or attenuation, to a range of frequencies.

Q: The width of the band of frequencies that are boosted. A large value implies a narrow width. frequency: The center frequency of the boost range. gain: The boost, in dB, to be applied. If the value is negative, the frequencies are attenuated.

notch: The notch filter (also known as a band-stop, or band-rejection filter) is the opposite of a bandpass filter. It allows all frequencies through, except for a set of frequencies.

Q: The width of the band of frequencies that are attenuated. A large value implies a narrow width. frequency: The center frequency of the attenuation range. gain: Not used.

allpass: An allpass filter allows all frequencies through, but changes the phase relationship between the various frequencies. It implements a second-order allpass filter.

Q: The sharpness of the phase transition at the center frequency. A larger value implies a sharper transition and a larger group delay. frequency: The frequency where the center of the phase transition occurs. Viewed another way, this is the frequency with maximal group delay. gain: Not used.

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/BiquadFilterNode

detune cljs

(detune this)

Property.

An a-rate audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadFilter.detune.value = 100;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/detune

frequency cljs

(frequency this)

Property.

An audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadFilter.frequency.value = 3000;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/frequency

gain cljs

(gain this)

Property.

An audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.gain.value = 25;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/gain

get-frequency-response cljs

(get-frequency-response this
                        frequency-array
                        mag-response-output
                        phase-response-output)

Method.

web.undefined

BiquadFilterNode.getFrequencyResponse(frequencyArray, magResponseOutput, phaseResponseOutput);

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/getFrequencyResponse

q cljs

(q this)

Property.

An audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.Q.value = 100;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/Q

set-detune! cljs

(set-detune! this val)

Property.

An a-rate audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadFilter.detune.value = 100;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/detune

set-frequency! cljs

(set-frequency! this val)

Property.

An audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadFilter.frequency.value = 3000;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/frequency

set-gain! cljs

(set-gain! this val)

Property.

An audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.gain.value = 25;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/gain

set-q! cljs

(set-q! this val)

Property.

An audio.AudioParam.

`var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.Q.value = 100;

Note: Though the AudioParam returned is read-only, the value it represents is not.`

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/Q

set-type! cljs

(set-type! this val)

Property.

A string (enum) representing a BiquadFilterType.

var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.type = 'lowpass';

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/type

type cljs

(type this)

Property.

A string (enum) representing a BiquadFilterType.

var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.type = 'lowpass';

See also: https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/type