What could be causing variations in the performance of my Speech Recognition code each time I run it?

Question

What could be causing variations in the performance of my Speech Recognition code each time I run it?

Check out my code snippet:

export class voiceRecognition {
  constructor() { }

  public startVoiceRecognition() {
    const recognition = new webkitSpeechRecognition();
    recognition.continuous = false;
    recognition.interimresults = false;
    recognition.lang = "en-US";

    recognition.start();

    recognition.onresult = function (e) {
      const response = e.results[0][0].transcript;
      this.customResponse(response);
      recognition.stop();
    }

    recognition.onerror = function (e) {
      recognition.stop();
    }
  }

  public customResponse(response) {
    //Code to handle customer response goes here//
  }
}

The issue I'm facing is I'm having trouble calling the customResponse(response) function from recognition.onresult.

Update: I switched from

recognition.onresult=function(event){}

to

recognition.addEventListener("result",(event)=>{})

and this successfully called the function inside it. However, I'm encountering a problem where sometimes it works and sometimes it doesn't when I run it again. It's not even executing

recognition.addEventListener("error",(event)=>{})

. Any idea why the same code behaves differently at times?

javascript angular typescript webkitspeechrecognition

Answer 1

Answer №1

When you use the function keyword, the context (this) is not bound to the function.

There are two ways to address this:

(recommended) Use an arrow function, which automatically binds the context. For example:

voice_recognition.onresult = (e) => {
  ...
  this.cust_response(response);
}

Alternatively, store the value of this in a variable in the enclosing scope and refer to it. For example:

const self = this;

voice_recognition.onresult = function(e){
  ...
  self.cust_response(response);
}

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this

Answer 2

When you use the function keyword, the context (this) is not bound to the function.

There are two ways to address this:

(recommended) Use an arrow function, which automatically binds the context. For example:

voice_recognition.onresult = (e) => {
  ...
  this.cust_response(response);
}

Alternatively, store the value of this in a variable in the enclosing scope and refer to it. For example:

const self = this;

voice_recognition.onresult = function(e){
  ...
  self.cust_response(response);
}

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this

Answer 3

Answer №2

To access class member variables using the this keyword in callbacks, you can either use bind(this) or arrow function notation.

Consider implementing the following:

public beginSpeechRecognition() {
  const speechRecognition = new webkitSpeechRecognition();
  speechRecognition.continuous = false;
  speechRecognition.interimresults = false;
  speechRecognition.lang = "en-US";

  speechRecognition.start();

  speechRecognition.onresult = (e) => {              
    const response = e.results[0][0].transcript;
    this.processResponse(response);
    speechRecognition.stop();
  }

  speechRecognition.onerror = (e) => {
    speechRecognition.stop();
  }
}

For more information, you can check out this link.

Answer 4

To access class member variables using the this keyword in callbacks, you can either use bind(this) or arrow function notation.

Consider implementing the following:

public beginSpeechRecognition() {
  const speechRecognition = new webkitSpeechRecognition();
  speechRecognition.continuous = false;
  speechRecognition.interimresults = false;
  speechRecognition.lang = "en-US";

  speechRecognition.start();

  speechRecognition.onresult = (e) => {              
    const response = e.results[0][0].transcript;
    this.processResponse(response);
    speechRecognition.stop();
  }

  speechRecognition.onerror = (e) => {
    speechRecognition.stop();
  }
}

For more information, you can check out this link.

What could be causing variations in the performance of my Speech Recognition code each time I run it?

Answer №1

Answer №2

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