Research and realization of time alignment in objective audio quality assessment

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.