我希望我的应用能够识别来自麦克风的语音，并允许后台音频继续播放。
我的应用程序识别通过麦克风传来的语音并将其转换为文本。当我的应用程序启动时，它会关闭后台播放的任何音频。
在我的应用使用麦克风收听语音时，是否可以让背景音频继续播放？
精简代码：

import UIKit
import Speech
class ViewController: UIViewController {
    public private(set) var isRecording = false
    private var audioEngine: AVAudioEngine!
    private var inputNode: AVAudioInputNode!
    private var audioSession: AVAudioSession!
    private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override public func viewDidAppear(_ animated: Bool) {
        checkPermissions()
        startRecording()
        isRecording.toggle()
    }
    
    private func startRecording() {

        guard let recognizer = SFSpeechRecognizer(), recognizer.isAvailable else {
            handleError(withMessage: "Speech recognizer not available.")
            return
        }
        recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
        recognitionRequest!.shouldReportPartialResults = true
        recognizer.recognitionTask(with: recognitionRequest!) { (result, error) in
            guard error == nil else { self.handleError(withMessage: error!.localizedDescription); return }
            guard let result = result else { return }
            print(result.bestTranscription.segments)
        }
        audioEngine = AVAudioEngine()
        inputNode = audioEngine.inputNode
        let recordingFormat = inputNode.outputFormat(forBus: 0)
        inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, _) in
            self.recognitionRequest?.append(buffer)
        }
        audioEngine.prepare()

        do {
            audioSession = AVAudioSession.sharedInstance()
            try audioSession.setCategory(.record, mode: .spokenAudio, options: .duckOthers)
            try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
            try audioEngine.start()
        } catch {
            handleError(withMessage: error.localizedDescription)
        }
    }
    private func checkPermissions() {
        SFSpeechRecognizer.requestAuthorization { authStatus in
            DispatchQueue.main.async {
                switch authStatus {
                case .authorized: break
                default: self.handlePermissionFailed()
                }
            }
        }
    }

    private func handlePermissionFailed() {
        // Present an alert asking the user to change their settings.
        let ac = UIAlertController(title: "This app must have access to speech recognition to work.",
                                   message: "Please consider updating your settings.",
                                   preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "Open settings", style: .default) { _ in
            let url = URL(string: UIApplication.openSettingsURLString)!
            UIApplication.shared.open(url)
        })
        ac.addAction(UIAlertAction(title: "Close", style: .cancel))
        present(ac, animated: true)
    }
    private func handleError(withMessage message: String) {
        // Present an alert.
        let ac = UIAlertController(title: "An error occured", message: message, preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    }
}

当我运行应用且后台有音频运行时，我的应用会暂停音频。我尝试退出应用并重新启动音频，但当我返回应用时，它会再次暂停背景音频。我希望在应用使用麦克风收听时音频继续播放。
我试过删除“选项：.duckOthers”，但这并没有什么不同。
我相信我想做的事情是可能的。例如，Shazam可以在扬声器上播放一首歌，同时使用麦克风收听和识别它。