如果某个量化字长能反映出输出弱信号的变化，输出信噪比主要取决于自适应运算的字长。
If the variation of input weak signal can be reflected by certain word length, the output SNR mainly depends on the word length of adaptive operations.
根据定点仿真结果还发现：在高量化字长的情况下，选取合适的定标方式所得到的定点性能甚至不比浮点性能差。
And the result of simulation also shows that: performance of fixed-point system is no worse than float-point system when quantization of high order and suitable fix point are employed.
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