원문정보
초록
영어
In this paper, we address issues associated with the real-time implementation of upmixing stereo audio into 5.1 channel audio in order to improve audio realism. First, we review four different upmixing methods, including a passive surround decoding method, a least-meansquare based upmixing method, a principal component analysis based upmixing method, and an adaptive panning method. After that, we implement a simulator that includes the upmixing methods and audio controls to play both stereo and upmixed 5.1 channel audio signals. Finally, we carry out a MUSHRA test to compare the quality of the upmixed 5.1 channel audio signals to that of the original stereo audio signal. It is shown from the test that the upmixed 5.1 channel audio signals generated by the four different upmixing methods are preferred to the original stereo audio signals.
목차
1. Introduction
2. Audio Upmixing Algorithm from Stereo to 5.1 Channel Audio
2.1. Passive Surround Decoding Method
2.2. LMS-based Upmixing Method
2.3. PCA-based Upmixing Method
2.4. Adaptive Panning Method
2.5. Low-pass Filters
2.6. Time Delay and ±90° Phase Shifter
3. Design and Implementation of an Audio Upmixing Simulator
4. Performance Evaluation
5. Conclusion
References