针对ISO标准算法并没有考虑可用比特数小于编码所需比特数的情况而不能实现编码音质的最佳化的问题,利用人耳对音频信号中的高频部分不敏感的感知特性,根据待编码音频信号各比例因子带的能量分布情况,提出了一种新的自适应比特分配策略。结果表明,与标准算法相比,文中算法在降低编码计算量的同时能有效提高编码主观音质。 For the ISO standard algorithm, the problem that the number of available bits is less than the number of bits required for encoding can not be achieved and the perceived quality of the human ear that is insensitive to the high frequency part of the audio signal is not considered. A new adaptive bit allocation strategy is proposed based on the energy distribution of each band of the audio signal. The results show that compared with the standard algorithm, the proposed algorithm can effectively improve the coding subjective quality while reducing the computational complexity.