小芯片推动大市场——2003MP3产业报告 原理篇、市场篇、产品篇

经过几年的发展，MP3播放器的应用领域已经向消费类电子产品的各个领域延伸，发展出多种多样的产品形式。按照资料存储方式的不同，我们可以将MP3分为两大类。

STUDY ON AUDIO INFORMATION HIDING METHOD BASED ON MODIFIED PHASE PARTITION

Hiding efficiency of traditional audio information hiding methods is always low since the sentience similarity cannot be guaranteed. A new audio information hiding method is proposed in this letter which can impose the insensitivity with the audio phase for auditory and realize the information hiding through specific algorithm in order to modify local phase within the auditory perception. The algorithm is to introduce the operation of "set 1" and "set 0" for every phase vectors, then the phases must lie on the boundary of a phase area after modified. If it lies on "1" boundary, it comes by set 1 operation. If it lies on "0" boundary, it comes by set 0 operation. The results show that, compared with the legacy method, the proposed method has better auditory similarity, larger information embedding capacity and lower code error rate. As a kind of blind detect method, it fits for application scenario without channel interference.

语言知觉双加工:桥接虚拟与现实的认知机制

文章聚焦虚拟现实口译实训的认知过程,探讨语言知觉双加工机制在虚拟与现实之间的联通作用。在虚拟环境中,学习者通过语言知觉双重编码,将语言知识和内省体验存储为多元表征。在现实环境中,学习者通过语言知觉先后解码,将获得的知识和技能应用于实战。对语言知觉双加工机制的研究为基于虚拟现实技术的口译教学提供了理论依据,从体验和情境两个方向指导口译能力习得。