由于3G移动信道环境严酷,带宽资源有限,为了实现低码率、高质量的音频信号传输和重建,在研究现有语音/音频带宽扩展技术的基础上,提出了一种基于EAAC+编码标准的改进移动音频编码算法。该算法通过检测并去除短暂态信号带来的正弦分量,从而降低计算的复杂度,实现传输信道带宽的扩展,并保证重建音频信号的音质。
The environment of 3G mobile channel is complex and the wireless transmission frequency band resources are limited. In order to achieve the transmission and reconstruction of low bit rate and high-quality audio signal, a modified EAAC + mobile audio ceding algorithm based on the existing technology of speech or audio bandwidth extension research is presented in this paper. The algorithm can reduce the computational complexity, achieve the bandwidth extension of transmission channel, and ensure the tone quality of reconstructed audio signal by detecting and removing the sinusoidal component of short transient signal.