FrequencyShifter can be used to shift all frequencies of a signal by a fixed amount. The amount can be changed at audio rate and the effect is applied in real time. The frequency shifting is implemented with a technique called single side band modulation using a ring modulator. Note: Contrary to pitch shifting, all frequencies are shifted by the same amount, destroying the harmonic relationship between them. This leads to the classic ring modulator timbre distortion. The algorithm will produces some aliasing towards the high end, especially if your source material contains a lot of high frequencies. Unfortunatelly the webaudio API does not support resampling buffers in real time, so it is not possible to fix it properly. Depending on the use case it might be an option to low pass filter your input before frequency shifting it to get ride of the aliasing. You can find a very detailed description of the algorithm here: https://larzeitlin.github.io/RMFS/
import { FrequencyShifter, Oscillator } from "tone";
const input = new Oscillator(230, "sawtooth").start();
const shift = new FrequencyShifter(42).toDestination();
input.connect(shift);The number of seconds of 1 processing block (128 samples)
channelCount is the number of channels used when up-mixing and down-mixing connections to any inputs to the node. The default value is 2 except for specific nodes where its value is specially determined.
channelCountMode determines how channels will be counted when up-mixing and down-mixing connections to any inputs to the node. The default value is "max". This attribute has no effect for nodes with no inputs.
channelInterpretation determines how individual channels will be treated when up-mixing and down-mixing connections to any inputs to the node. The default value is "speakers".
The context belonging to the node.
Set this debug flag to log all events that happen in this class.
Indicates if the instance was disposed. 'Disposing' an instance means that all of the Web Audio nodes that were created for the instance are disconnected and freed for garbage collection.
The ring modulators carrier frequency. This frequency determines by how many Hertz the input signal will be shifted up or down. Default is 0.
The number of inputs feeding into the AudioNode. For source nodes, this will be 0.
The number of outputs of the AudioNode.
The duration in seconds of one sample.
The version number semver
The wet control is how much of the effected will pass through to the output. 1 = 100% effected signal, 0 = 100% dry signal.
Connect the output of this node to the rest of the nodes in series.
import { Destination, Filter, Oscillator, Volume } from "tone";
const osc = new Oscillator().start();
const filter = new Filter();
const volume = new Volume(-8);
// connect a node to the filter, volume and then to the master output
osc.chain(filter, volume, Destination);
connect the output of a ToneAudioNode to an AudioParam, AudioNode, or ToneAudioNode
The output to connect from
The input to connect to
disconnect the output
connect the output of this node to the rest of the nodes in parallel.
Get the object's attributes.
import { Oscillator } from "tone";
const osc = new Oscillator();
console.log(osc.get());
// returns {"type" : "sine", "frequency" : 440, ...etc}
Returns all of the default options belonging to the class.
Return the current time of the Context clock without any lookAhead.
Return the current time of the Context clock plus the lookAhead.
Set multiple properties at once with an object.
import { Filter } from "tone";
const filter = new Filter();
// set values using an object
filter.set({
frequency: 300,
type: "highpass"
});
Connect the output to the context's destination node.
Convert the input to a frequency number
Connect the output to the context's destination node. See toDestination
Convert the incoming time to seconds
Convert the class to a string
import { Oscillator } from "tone";
const osc = new Oscillator();
console.log(osc.toString());
Convert the input time into ticks