SpeechSynthesisUtterance: pitch property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2018.
The pitch
property of the SpeechSynthesisUtterance
interface gets and sets the pitch at which the utterance will be spoken at.
If unset, a default value of 1 will be used.
Value
A float representing the pitch value. It can range between 0 (lowest) and 2 (highest), with 1 being the default pitch for the current platform or voice. Some speech synthesis engines or voices may constrain the minimum and maximum rates further. If SSML is used, this value will be overridden by prosody tags in the markup.
Examples
js
const synth = window.speechSynthesis;
const inputForm = document.querySelector("form");
const inputTxt = document.querySelector("input");
const voiceSelect = document.querySelector("select");
const voices = synth.getVoices();
// ...
inputForm.onsubmit = (event) => {
event.preventDefault();
const utterThis = new SpeechSynthesisUtterance(inputTxt.value);
const selectedOption =
voiceSelect.selectedOptions[0].getAttribute("data-name");
for (let i = 0; i < voices.length; i++) {
if (voices[i].name === selectedOption) {
utterThis.voice = voices[i];
}
}
utterThis.pitch = 1.5;
synth.speak(utterThis);
inputTxt.blur();
};
Specifications
Specification |
---|
Web Speech API # dom-speechsynthesisutterance-pitch |
Browser compatibility
BCD tables only load in the browser