SpeechRecognitionAlternative
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The SpeechRecognitionAlternative interface of the Web Speech API represents a single word that has been recognized by the speech recognition service.
Instance properties
SpeechRecognitionAlternative.transcriptRead only-
Returns a string containing the transcript of the recognized word.
SpeechRecognitionAlternative.confidenceRead only-
Returns a numeric estimate between 0 and 1 of how confident the speech recognition system is that the recognition is correct.
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; }; Specifications
| Specification |
|---|
| Web Speech API # speechreco-alternative |