因為工作中會經(jīng)常遇到不同采樣率的聲音文件的問題，特意寫了一下重采樣的程序。

原理就是把采樣點轉(zhuǎn)換到時間刻度之后再進行插值，經(jīng)過測試，是沒有問題的。

#!/usr/bin/env python# -*- coding: utf-8 -*-# @Time : 17-7-21 下午2:32# @Author : Lei.Jinggui# @Site : http://blog.csdn.net/lccever# @File : Resample.py# @Software: PyCharm Community Edition# @contact: lccever@126.comimport numpy as npdef Resample(input_signal,src_fs,tar_fs): ’’’ :param input_signal:輸入信號 :param src_fs:輸入信號采樣率 :param tar_fs:輸出信號采樣率 :return:輸出信號 ’’’ dtype = input_signal.dtype audio_len = len(input_signal) audio_time_max = 1.0*(audio_len-1) / src_fs src_time = 1.0 * np.linspace(0,audio_len,audio_len) / src_fs tar_time = 1.0 * np.linspace(0,np.int(audio_time_max*tar_fs),np.int(audio_time_max*tar_fs)) / tar_fs output_signal = np.interp(tar_time,src_time,input_signal).astype(dtype) return output_signalif __name__ == ’__main__’: import wave import pyaudio def playSound(audio_data_short, framerate=16000, channels=1): preply = pyaudio.PyAudio() # 播放聲音 streamreply = preply.open(format=pyaudio.paInt16, channels=channels, rate=framerate, output=True) data = audio_data_short.tostring() streamreply.write(data) streamreply.close() preply.terminate() wave_file = ’test.wav’ audio_file = wave.open(wave_file, ’rb’) audio_data = audio_file.readframes(audio_file.getnframes()) audio_data_short = np.fromstring(audio_data, np.short) src_fs = audio_file.getframerate() src_chanels = audio_file.getnchannels() if src_chanels > 1: audio_data_short = audio_data_short[::src_chanels] tar_fs = np.int(src_fs * 0.5) playSound(audio_data_short,framerate=src_fs) audio_data_short0 = Resample(audio_data_short,src_fs,tar_fs) playSound(audio_data_short0,framerate=tar_fs)

補充知識：Python 多線程的退出/停止的一種是實現(xiàn)思路

在使用多線程的過程中,我們知道,python的線程是沒有stop/terminate方法的,也就是說它被啟動后,你無法再主動去退出它,除非主進程退出了,注意,是主進程,不是線程的父進程.

一個比較合理的方式就是把原因需要放到threading.Thread的target中的線程函數(shù),改寫到一個繼承類中,下面是一個實現(xiàn)例子

import threadingimport timeimport os # 原本需要用來啟動的無線循環(huán)的函數(shù)def print_thread(): pid = os.getpid() counts = 0 while True: print(f’threading pid: {pid} ran: {counts:04d} s’) counts += 1 time.sleep(1) # 把函數(shù)放到改寫到類的run方法中，便可以通過調(diào)用類方法，實現(xiàn)線程的終止class StoppableThread(threading.Thread): def __init__(self, daemon=None): super(StoppableThread, self).__init__(daemon=daemon) self.__is_running = True self.daemon = daemon def terminate(self): self.__is_running = False def run(self): pid = os.getpid() counts = 0 while self.__is_running: print(f’threading running: {pid} ran: {counts:04d} s’) counts += 1 time.sleep(1) def call_thread(): thread = StoppableThread() thread.daemon = True thread.start() pid = os.getpid() counts = 0 for i in range(5): print(f’0 call threading pid: {pid} ran: {counts:04d} s’) counts += 2 time.sleep(2) # 主動把線程退出 thread.terminate() if __name__ == ’__main__’: call_thread() print(f’==========call_thread finish===========’) counts = 0 for i in range(5): counts += 1 time.sleep(1) print(f’main thread:{counts:04d} s’)

以上這篇基于Python 的語音重采樣函數(shù)解析就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持好吧啦網(wǎng)。