使用 SpeechRecognition 更改语音合成语音

Question

我正在通过麦克风使用 SpeechRecognition，并通过 SpeechSynthesis 将数据转发给我。

我在页面加载时将声音设置为女性声音，并希望能够通过说“男性声音”切换为男性声音，然后转播“我现在是男性”。我后来也希望能够做相反的事情 - 当它设置为男性声音时，说“女性声音”然后它会切换回来。

我目前可以这样做，但男声只会说一次，因为声音没有被保存，只是作为参数传递。因此，接下来所说的将回到女声：

let voices = [];
window.speechSynthesis.onvoiceschanged = function() {
  voices = window.speechSynthesis.getVoices();
};

function loadVoices(message, voice) {
  const msg = new SpeechSynthesisUtterance();
  msg.voice = voice || voices[48]; // female voice
  msg.text = message;
  speechSynthesis.speak(msg);
};

// asking for voice change here
  if (transcript.includes('male voice')) {
    let message = ('I am now a man');
    let voice = voices[50]; // male voice
    loadVoices(message, voice);
  }

我尝试使用一个全局变量，使msg.voice 指向一个全局变量，但这不起作用，而且语音恢复为默认值（电子语音）：

let voiceGender = voices[48];
function loadVoices(message) {
  const msg = new SpeechSynthesisUtterance();
  msg.voice = voiceGender // now a variable pointing to another.
  msg.text = message;
  speechSynthesis.speak(msg);
};

  if (transcript.includes('male voice')) {
    let message = ('I am now a man');
    let voiceGender = voices[50]; // changing the global variable
    loadVoices(message);
  }

如果我在loadVoices() 内声明voiceGender，那么我无法从另一个函数内的if 更改它。

如何设置 Javascript 结构以实现此目的？

Answer 1

我通过在 loadVoices 函数中添加一个函数和一个带有条件的布尔值来解决它：

// on pageload the voice is set to a female voice
let femaleVoice = true;

function loadVoices(message) {
  const msg = new SpeechSynthesisUtterance();

  // checks the boolean
  if (femaleVoice) {
    msg.voice = voices[48];
  } else {
    msg.voice = voices[50];
  }

  msg.text = message;
  speechSynthesis.speak(msg);
};

// changes the boolean / changes the gender of the SpeechSynthesisUtterance voice
function changeVoice() {
  if (femaleVoice) {
    femaleVoice = false;
  } else {
    femaleVoice = true;
  }
}

if (transcript.includes('male voice') || transcript.includes('female voice') ) {
  // calls the function to change the boolean.
  changeVoice();

  let message = ('I now have a different voice');
  loadVoices(message);
}

它确实添加了比最初想要的多一点的行，但绝对有效。