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OSError：没有可用的默认输入设备

我正在尝试使用 python 中的 SpeechRecognition 包进行语音识别，并在尝试使用麦克风时遇到问题。

我测试了我的耳机麦克风，它工作正常并且正在被我的计算机检测到，但是我的脚本抛出错误，好像没有连接麦克风一样。当我在安装 pyAudio 后运行以下脚本时

$python -m speech_recognition

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我收到以下错误：

  Traceback (most recent call last):

   File "/home/harshita/anaconda3/lib/python3.6/runpy.py", line 193, in _run_module_as_main
        "__main__", mod_spec)

    File "/home/harshita/anaconda3/lib/python3.6/runpy.py", line 85, in _run_code
        exec(code, run_globals)

    File "/home/harshita/anaconda3/lib/python3.6/site-packages/speech_recognition/__main__.py", line 4, in <module>
        m = sr.Microphone()

    File "/home/harshita/anaconda3/lib/python3.6/site-packages/speech_recognition/__init__.py", line 86, in __init__
        device_info = audio.get_device_info_by_index(device_index) if device_index is not None else audio.get_default_input_device_info()

    File "/home/harshita/anaconda3/lib/python3.6/site-packages/pyaudio.py", line 949, in get_default_input_device_info
        device_index = pa.get_default_input_device()

    OSError: No Default Input Device Available

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并且：