private func startRecording() throws {
    //ここに録音する処理を記述
    if let recognitionTask = recognitionTask {
        //リセット処理
        recognitionTask.cancel()
        self.recognitionTask = nil
        let audioSession = AVAudioSession.sharedInstance()
        try audioSession.setCategory(AVAudioSession.Category.record, mode: .default)
        try audioSession.setMode(AVAudioSession.Mode.measurement)
        try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
    }
}

var talker = AVSpeechSynthesizer()

override func viewDidLoad() {
    //speechButtonの生成処理
    speechButton.addTarget(resultCardView, action: #selector(speachButtonTapped(sender: )), for: .touchUpInside
}

@objc func speachButtonTapped(sender: Any) {
    let avSession = AVAudioSession.sharedInstance()
    try? avSession.setCategory(AVAudioSession.Category.ambient, mode: .default, options: .mixWithOthers)
    let utterance = AVSpeechUtterance(string:self.Jplabel.text!)
    utterance.voice = AVSpeechSynthesisVoice(language: "en-En")
    utterance.volume = 1.2
    // 実行
    self.talker.speak(utterance)
}

var talker = AVSpeechSynthesizer()

var speechButton:UIButton!