Level quantization method based on equal noise and achieving device thereof

The invention discloses a level quantization method based on equal noise and an achieving device of the level quantization method. The method includes the steps that input signals are received; an initial value of N is obtained, according to x0 and N, a first layered level x1 and a first quantization level x0 are calculated, x0 is the minimum value in the input signals of a quantizer, and N is quantization noise power in a quantization interval; on the basis of the calculated result, layered levels from the first to L-1 (x1, x2, ...x L-1) and quantization levels from the first to L-1 are calculated through iterative operation, and L is the target quantization level number of the quantizer; an L quantization level and quantization noise NQL in a last quantization interval are calculated according to the calculated XL-1 and a calculated L layered level, the absolute value of NQL-N is compared with Ndelta, and xL is the maximum value in the input signals; when the absolute value of NQL-N is larger than N delta,