Webspeech API语音输出再次用作该API的输入

Question

我面临Webspeech API角度应用程序的问题。 API语音输出再次用作API的输入。由于耳机/耳机在附近并且扬声器和麦克风在附近，因此API输出音频再次被视为输入。我真的很感谢有人能对此提供帮助。

下面是我在应用程序中使用的代码示例。有什么方法可以阻止

    import { SpeechNotification } from './model/speech-notification';
    import {ChatconfigrationService} from './service/chatconfigration.service'
    import { SpeechError } from './model/speech-error';
    import { from } from 'zen-observable';

    const { webkitSpeechRecognition, SpeechRecognition, webkitSpeechGrammarList, webkitSpeechRecognitionEvent, SpeechGrammarList, SpeechRecognitionEvent} = (window as any)
    const outerthis = this;


    @Component({
      selector: 'app-chatbot',
      templateUrl: './chatbot.component.html',
      styleUrls: ['./chatbot.component.scss']
    })


    export class ChatbotComponent implements OnInit {

      recognizing:boolean = false;
      notification: string;
      currentLanguage: string;
      recognition: any;
      speechRecz:any;
      speechReconizationObject:any
      speechText:string
      chatSettings:any;
      repeatedTimes:any


      constructor(private speechRecognizer: SpeechRecognizerService,
                  private changeDetector: ChangeDetectorRef,
                  private userchatconfiguration: ChatconfigrationService)
      { }

      ngOnInit() {
        this.speechRecognizer.initialize();
        this.speechText='Hello!, We are listening you?'
        this.getUserchatSetting();
      }

      getUserchatSetting() {
        this.userchatconfiguration.getUserChatbotSetting()
          .subscribe(data => {
            this.chatSettings = data;
            this.repeatedTimes = data.chatbotVoiceOneRepeateTimes
            setTimeout(()=> {
              this.welcomeMessage()
            }, 3000);
        });
      }

      welcomeMessage() {
        this.speechReconizationObject = new SpeechSynthesisUtterance(this.speechText)
        this.speechReconizationObject.rate = this.chatSettings.rateOfSpeech;
        window.speechSynthesis.speak(this.speechReconizationObject);
        this.speechText = this.chatSettings.welcomeMessage
        this.speechRecognizer.start();
        this.initRecognition();
      }

      private initRecognition() {

        this.speechRecognizer.onStart().subscribe(data => {
          this.recognizing = true;
          this.notification = 'I\'m listening...';
          console.info('This is speech recognize stated point');
          this.detectChanges();
        });

        this.speechRecognizer.onEnd().subscribe(data => {
          this.recognizing = false;
          this.notification = 'speech reconization is ended';
          console.info('This is speech recognize end point');
        });


        this.speechRecognizer.onnomatch().subscribe(data => {

        })

        this.speechRecognizer.onResult().subscribe((data: SpeechNotification) => {
          let message = data.content.trim();
          if (data.info === 'final_transcript' && message.length > 0) {
              console.info('entered into the final result')
              console.log(data)
              this.recognizing = false;
          }
        });
      }

      detectChanges = () => {
        const outerthis = this;
        (function myLoop(i) {
          setTimeout(function () {
            var msg = new SpeechSynthesisUtterance(outerthis.speechText);
            this.speechReconizationObject = new SpeechSynthesisUtterance(this.speechText)
            msg.rate = outerthis.chatSettings.rateOfSpeech;
            console.info(i);
            if (i == 1) {
              outerthis.speechRecognizer.stop();
              return false;
            } else {
              window.speechSynthesis.speak(msg);
            }
            if (--i)
              myLoop(i); //  decrement i and call myLoop again if i > 0
          }, 4000);
        })(this.repeatedTimes);
      }
    }