电能质量数据压缩，基于小波变换的（如Db3 haar）压缩-Power quality data compression, wavelet transform (such as Db3 haar) compression

128点的小波变换，小波函数采用db3，变换过程采用FFT圆周卷积快速实现卷积过程。-128-point wavelet transform, wavelet function using db3 conversion process using the FFT circular convolution convolution process quickly.