SpeechRecognitionAlternative: confidence property
The confidence
read-only property of the
SpeechRecognitionResult
interface returns a numeric estimate of how
confident the speech recognition system is that the recognition is correct.
Note: Mozilla's implementation of confidence
is still
being worked on — at the moment, it always seems to return 1.
Value
A number between 0 and 1.
Examples
This code is excerpted from our Speech color changer example.
js
recognition.onresult = (event) => {
// The SpeechRecognitionEvent results property returns a SpeechRecognitionResultList object
// The SpeechRecognitionResultList object contains SpeechRecognitionResult objects.
// It has a getter so it can be accessed like an array
// The first [0] returns the SpeechRecognitionResult at position 0.
// Each SpeechRecognitionResult object contains SpeechRecognitionAlternative objects
// that contain individual results.
// These also have getters so they can be accessed like arrays.
// The second [0] returns the SpeechRecognitionAlternative at position 0.
// We then return the transcript property of the SpeechRecognitionAlternative object
const color = event.results[0][0].transcript;
diagnostic.textContent = `Result received: ${color}.`;
bg.style.backgroundColor = color;
console.log(`Confidence: ${event.results[0][0].confidence}`);
};
Specifications
Specification |
---|
Web Speech API # dom-speechrecognitionalternative-confidence |
Browser compatibility
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