First, to reduce the data dynamic range, block adaptive quantization of raw data is implemented and the sign bit of raw data is coded separately.And then, VQ is applied in the data.

• 首先对原始数据进行块自适应量化，并将其符号位提取出来单独编码，从而大幅度缩小了数据的动态范围，然后对块自适应量化后的数据进行矢量量化编码。