语音压缩，使用pcm编码，计算压缩比，信噪比，保留能量-Voice compression, pcm Encode to calculate the compression ratio, signal to noise ratio, retained energy

其一噪声是否按指定的信噪比叠加，其二怎么样检验带噪信号中信噪比满足指定的信噪比。-First noise is superimposed specified signal-to-noise ratio, and the second is how to test signal with noise in the signal-to-noise ratio to meet the specified signal-to-noise ratio.

生成叠加任意噪声数据和任意信噪比的带噪语音。生成叠加高斯白噪声的带噪语音和测量信噪比。-Generating noisy speech with any random noise data and any signal-to-noise ratio. Generating noisy speech and measuring signal to noise ratio of superimposed white noise.