尝试这种方式：
r = sr.Recognizer()
m = sr.Microphone(device_index=2)
def loop():
with m as source:
print("say something")
audio = r.listen(source)
try:
print("you said "+r.recognize_google(audio))
except sr.UnkNownValueError:
print("Could not understand")
except sr.RequestError as e:
print("errpr: {0}".format(e))
loop()
不要创建多个Microphone()实例。
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