| 1 | import { ToneAudioNode, ToneAudioNodeOptions } from "../../core/context/ToneAudioNode.js";
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| 2 | import { Cents, Frequency, GainFactor } from "../../core/type/Units.js";
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| 3 | import { Param } from "../../core/context/Param.js";
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| 4 | export interface BiquadFilterOptions extends ToneAudioNodeOptions {
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| 5 | frequency: Frequency;
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| 6 | detune: Cents;
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| 7 | Q: number;
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| 8 | type: BiquadFilterType;
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| 9 | gain: GainFactor;
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| 10 | }
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| 11 | /**
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| 12 | * Thin wrapper around the native Web Audio [BiquadFilterNode](https://webaudio.github.io/web-audio-api/#biquadfilternode).
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| 13 | * BiquadFilter is similar to {@link Filter} but doesn't have the option to set the "rolloff" value.
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| 14 | * @category Component
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| 15 | */
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| 16 | export declare class BiquadFilter extends ToneAudioNode<BiquadFilterOptions> {
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| 17 | readonly name: string;
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| 18 | readonly input: BiquadFilterNode;
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| 19 | readonly output: BiquadFilterNode;
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| 20 | /**
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| 21 | * The frequency of the filter
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| 22 | */
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| 23 | readonly frequency: Param<"frequency">;
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| 24 | /**
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| 25 | * A detune value, in cents, for the frequency.
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| 26 | */
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| 27 | readonly detune: Param<"cents">;
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| 28 | /**
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| 29 | * The Q factor of the filter.
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| 30 | * For lowpass and highpass filters the Q value is interpreted to be in dB.
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| 31 | * For these filters the nominal range is [−𝑄𝑙𝑖𝑚,𝑄𝑙𝑖𝑚] where 𝑄𝑙𝑖𝑚 is the largest value for which 10𝑄/20 does not overflow. This is approximately 770.63678.
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| 32 | * For the bandpass, notch, allpass, and peaking filters, this value is a linear value.
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| 33 | * The value is related to the bandwidth of the filter and hence should be a positive value. The nominal range is
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| 34 | * [0,3.4028235𝑒38], the upper limit being the most-positive-single-float.
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| 35 | * This is not used for the lowshelf and highshelf filters.
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| 36 | */
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| 37 | readonly Q: Param<"number">;
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| 38 | /**
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| 39 | * The gain of the filter. Its value is in dB units. The gain is only used for lowshelf, highshelf, and peaking filters.
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| 40 | */
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| 41 | readonly gain: Param<"decibels">;
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| 42 | private readonly _filter;
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| 43 | /**
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| 44 | * @param frequency The cutoff frequency of the filter.
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| 45 | * @param type The type of filter.
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| 46 | */
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| 47 | constructor(frequency?: Frequency, type?: BiquadFilterType);
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| 48 | constructor(options?: Partial<BiquadFilterOptions>);
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| 49 | static getDefaults(): BiquadFilterOptions;
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| 50 | /**
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| 51 | * The type of this BiquadFilterNode. For a complete list of types and their attributes, see the
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| 52 | * [Web Audio API](https://webaudio.github.io/web-audio-api/#dom-biquadfiltertype-lowpass)
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| 53 | */
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| 54 | get type(): BiquadFilterType;
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| 55 | set type(type: BiquadFilterType);
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| 56 | /**
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| 57 | * Get the frequency response curve. This curve represents how the filter
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| 58 | * responses to frequencies between 20hz-20khz.
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| 59 | * @param len The number of values to return
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| 60 | * @return The frequency response curve between 20-20kHz
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| 61 | */
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| 62 | getFrequencyResponse(len?: number): Float32Array;
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| 63 | dispose(): this;
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| 64 | }
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| 65 | |
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