CAJ | 학술논문

在音频质量客观评价(Perceptual Evaluation of Audio Quality,PEAQ)尤其是音频系统的在线评测时,参考信号与测试信号不可避免地存在系统延迟.计算参考与测试之间的延迟误差从而实现信号之间的时间同步将是影响音频质量客观评价结果的关键性问题.针对此问题,通过信号的包络求取、信号频域间的互相关及频域直方图等方法给出了一种实时高效的音频延迟算法.通过实际测量,该算法在广播音频质量在线监测系统中充分体现了实时、稳定和高效的特点.
재음빈질량객관평개(Perceptual Evaluation of Audio Quality,PEAQ)우기시음빈계통적재선평측시,삼고신호여측시신호불가피면지존재계통연지.계산삼고여측시지간적연지오차종이실현신호지간적시간동보장시영향음빈질량객관평개결과적관건성문제.침대차문제,통과신호적포락구취、신호빈역간적호상관급빈역직방도등방법급출료일충실시고효적음빈연지산법.통과실제측량,해산법재엄파음빈질량재선감측계통중충분체현료실시、은정화고효적특점.
Time delay can't be avoided between reference audio signal and test signal in the audio quality evaluation named PEAQ,especially which is employed for monitoring online audio system.Calculating the time delay and making time alignment between reference audio signal and test signal is very important for audio quality evaluation in audio coding,audio system and audio communication.To deal with the problem mentioned above,the article presents a real-time and efficient time delay algorithm by calculating audio envelope,frequency spectrum cross correlation and histogram.When this algorithm is applied in the broadcast audio monitoring system,it shows the characteristic of real-time,steady and highly active.