Bai Mingsian R, Shih Geng-Yu, Lee Chih-Chung
Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan, Republic of China.
J Acoust Soc Am. 2007 Jan;121(1):298-309. doi: 10.1121/1.2387121.
MPEG-1, layer 3 handsets equipped with dual loudspeakers and three-dimensional audio modules have received much attention in the market of consumer electronics. To create spatial impression during audio reproduction, the head-related transfer function (HRTF) and the crosstalk cancellation system (CCS) are key elements in many audio spatializers. However, there are many factors that one should take into account during the design and implementation stages of an audio spatializer in the handset application. In the paper, a comprehensive study was undertaken to compare various audio spatializers for use with dual-loudspeaker handsets, in the context of inverse filtering strategies. Two deconvolution approaches, the frequency-domain method and the time-domain method, are employed to design the required inverse filters. Different approaches to design audio spatializers with the HRTF, CCS, and their combination are compared. In particular, two modified CCS approaches are suggested. Issues in the implementation phase such as regularization, complex smoothing, and structures of inverse filters are also addressed in the paper. Comprehensive objective and subjective tests were conducted to investigate the aforementioned aspects of audio spatializers. The data obtained from the subjective tests are processed by using the multianalysis of variance to justify statistical significance of the results.
配备双扬声器和三维音频模块的MPEG-1第三层手机在消费电子市场上备受关注。为了在音频再现过程中营造空间感，头部相关传递函数（HRTF）和串扰消除系统（CCS）是许多音频空间化器的关键要素。然而，在手机应用中音频空间化器的设计和实现阶段，有许多因素需要考虑。本文在逆滤波策略的背景下，对用于双扬声器手机的各种音频空间化器进行了全面研究。采用两种反卷积方法，即频域法和时域法来设计所需的逆滤波器。比较了使用HRTF、CCS及其组合设计音频空间化器的不同方法。特别提出了两种改进的CCS方法。本文还讨论了实现阶段的问题，如正则化、复平滑和逆滤波器的结构。进行了全面的客观和主观测试，以研究音频空间化器的上述方面。通过使用方差多分析对主观测试获得的数据进行处理，以证明结果的统计显著性。
