Research On 3D Audio Effect Enhancement Technology For Mobile And Portable Platforms

The natural audio can always provide 3D space information which includes size and location information. The subjective sense of this space information is called 3D audio-effect. To reduce the loss of space information during recording and playback, stereophony technology was introduced. However, traditional dual-channel stereo audio can not supply excellent 3D audio-effect, especially on mobile and portable platforms. Therefore, it is necessary to research 3D audio-effect enhancement technology for mobile and portable platforms.In this paper, a novel 3D audio-effect enhancement algorithm for mobile and portable platforms is introduced. This algorithm solves two primary issues about the 3D audio-effect for mobile and potable platforms. The first issue is that the sound field of traditional dual-channel stereo audio is always in a narrow range. This algorithm repairs the sound field by extending the original dual-channel audio to 4-channel surround stereo audio. The second issue is that, because mobile and portable platforms usually employ headphone playback system, their 3D audio-effect is uncomfortable and provides a narrower sound field effect. The algorithm solves this issue by using HRTF processing and room acoustic simulation. The subject evaluation shows that this algorithm can obviously enhance 3D audio-effect for mobile and portable platform applications.Furthermore, to meet the requirements of real-time applications on mobile and portable platforms, this algorithm can also provide low complexity by proper simplification and optimization. To further reduce complexity, the porting, fix-pointing and optimization of this algorithm to ARM9 platforms are also introduced. The evaluation statistic shows that this algorithm can meet the requirements of most real-time applications on primary mobile and portable platforms.