一个简单的扩频语音水印算法，包括pn产生函数，水印的嵌入和提取算法，以及水印的攻击函数，另加两个测试函数，其中out_test是对水印攻击后进行水印的提取。-A simple spread spectrum watermarking algorithm voice, including pn generation function, watermark embedding and extraction algorithms, watermark and attack functions, plus two test functions, which out_test is watermarking attack after watermark extraction.