SFSpeechRecognizer - detect end of utterance

Question

I am hacking a little project using iOS 10 built-in speech recognition. I have working results using device\'s microphone, my speech is recognized very accurately.

M

Answer 1

It seems that isFinal flag doesn't became true when user stops talking as expected. I guess this is a wanted behaviour by Apple, because the event "User stops talking" is an undefined event.

I believe that the easiest way to achieve your goal is to do the following:

• You have to estabilish an "interval of silence". That means if the user doesn't talk for a time greater than your interval, he has stopped talking (i.e. 2 seconds).

• Create a Timer at the beginning of the audio session:

var timer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: "didFinishTalk", userInfo: nil, repeats: false)

• when you get new transcriptions in recognitionTaskinvalidate and restart your timer

  timer.invalidate() timer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: "didFinishTalk", userInfo: nil, repeats: false)

• if the timer expires this means the user doesn't talk from 2 seconds. You can safely stop Audio Session and exit