作为Nick Fortescue回答的后续措施，下面是一个更完整的示例，说明如何从麦克风进行录音并处理结果数据：
from sys import byteorderfrom array import arrayfrom struct import packimport pyaudioimport waveTHRESHOLD = 500CHUNK_SIZE = 1024FORMAT = pyaudio.paInt16RATE = 44100def is_silent(snd_data): "Returns 'True' if below the 'silent' threshold" return max(snd_data) < THRESHOLDdef normalize(snd_data): "Average the volume out" MAXIMUM = 16384 times = float(MAXIMUM)/max(abs(i) for i in snd_data) r = array('h') for i in snd_data: r.append(int(i*times)) return rdef trim(snd_data): "Trim the blank spots at the start and end" def _trim(snd_data): snd_started = False r = array('h') for i in snd_data: if not snd_started and abs(i)>THRESHOLD: snd_started = True r.append(i) elif snd_started: r.append(i) return r # Trim to the left snd_data = _trim(snd_data) # Trim to the right snd_data.reverse() snd_data = _trim(snd_data) snd_data.reverse() return snd_datadef add_silence(snd_data, seconds): "Add silence to the start and end of 'snd_data' of length 'seconds' (float)" silence = [0] * int(seconds * RATE) r = array('h', silence) r.extend(snd_data) r.extend(silence) return rdef record(): """ Record a word or words from the microphone and return the data as an array of signed shorts. Normalizes the audio, trims silence from the start and end, and pads with 0.5 seconds of blank sound to make sure VLC et al can play it without getting chopped off. """ p = pyaudio.PyAudio() stream = p.open(format=FORMAT, channels=1, rate=RATE, input=True, output=True, frames_per_buffer=CHUNK_SIZE) num_silent = 0 snd_started = False r = array('h') while 1: # little endian, signed short snd_data = array('h', stream.read(CHUNK_SIZE)) if byteorder == 'big': snd_data.byteswap() r.extend(snd_data) silent = is_silent(snd_data) if silent and snd_started: num_silent += 1 elif not silent and not snd_started: snd_started = True if snd_started and num_silent > 30: break sample_width = p.get_sample_size(FORMAT) stream.stop_stream() stream.close() p.terminate() r = normalize(r) r = trim(r) r = add_silence(r, 0.5) return sample_width, rdef record_to_file(path): "Records from the microphone and outputs the resulting data to 'path'" sample_width, data = record() data = pack('<' + ('h'*len(data)), *data) wf = wave.open(path, 'wb') wf.setnchannels(1) wf.setsampwidth(sample_width) wf.setframerate(RATE) wf.writeframes(data) wf.close()if __name__ == '__main__': print("please speak a word into the microphone") record_to_file('demo.wav') print("done - result written to demo.wav")
