Following the great improvement in interaction devices and software technologies, lots of novel interaction technologies which are based on Post-WIMP user interface are studied. It is crucial that the designer chooses...
详细信息
Following the great improvement in interaction devices and software technologies, lots of novel interaction technologies which are based on Post-WIMP user interface are studied. It is crucial that the designer chooses the interaction component or the interactiontechnology properly and efficiently to adapt to the various interaction devices and environments in the user interface designing. According to the analysis of the interaction process and the design level of the Post-WIMP user interface, an interaction-Centered Hierarchical Post-WIMP User Interface Model is presented. It is described and analyzed from the aspects of the user, task, device, behaviors and entity in interaction. Moreover, a Post-WIMP user interface auto-generate tool is designed and implemented based on the model, to help the designers to insert those novel interaction technologies into the system flexibly, and to develop and evaluate the prototype quickly and efficiently. Experiments show that, the model can guide the process of user interface design, the implement of prototype, and the evaluation of the result of design.
Pen-Based user interface software is widely applicable due to its natural and efficient interaction style, whose important characteristics are interaction-centered and individual by user-required. In order to map the ...
详细信息
Pen-Based user interface software is widely applicable due to its natural and efficient interaction style, whose important characteristics are interaction-centered and individual by user-required. In order to map the intention of users into the designs exactly and efficiently, PUIDM (Pen based User Interfaces software Domain Model) is presented, which is described and analyzed from the aspects of context, component, UI features and architecture, and implemented based on XML. Moreover, a user-centered design process based on the PUIDM is introduced. Experiments show that PUIDM can guide the process of design exactly and efficiently and make the designed software achieve the demand of usability.
The latest research developments at home and abroad on constructing 3D conceptual models based on gesture are summarized. The gesture-based human-computerinteraction and its key technologies are also discussed. At la...
详细信息
The latest research developments at home and abroad on constructing 3D conceptual models based on gesture are summarized. The gesture-based human-computerinteraction and its key technologies are also discussed. At last, future directions of the research are presented.
This paper proposes a fast search method of algebraic codebook in CELP coders. In the proposed method, the sequence of codebook search is reordered according to the criterion of mean squared weighted error between tar...
详细信息
ISBN:
(纸本)0780350413
This paper proposes a fast search method of algebraic codebook in CELP coders. In the proposed method, the sequence of codebook search is reordered according to the criterion of mean squared weighted error between target vector and filtered adaptive codebook vector, and the algebraic codebook is searched until a predetermined threshold is satisfied. This method reduces the computations considerably compared with G.729 at the expense of a slight degradation of speech quality. Moreover, it gives better speech quality with smaller average search space than G.729A.
This paper proposes a new 4 kbit/s speech coder based on CELP structure with 45 ms total codec delay. The coder is mainly featured by the renewal codebook of the excitation signal and the linked split-vector quantizer...
详细信息
ISBN:
(纸本)0818679190
This paper proposes a new 4 kbit/s speech coder based on CELP structure with 45 ms total codec delay. The coder is mainly featured by the renewal codebook of the excitation signal and the linked split-vector quantizer of line spectrum pair parameters which enable the coder to get high quality speech at low bit rate. In addition, techniques of formant enhancement in the spectral envelop and harmonic recovery in the transient region are also introduced to reduce buzzy and hoarse sounds, respectively. From the intensive listening test with intermediated response system (IRS) speech, we obtained a comparable subjective quality to 32 kbit/s ADPCM (ITU Recommendation G.726) under a nominal speech input level of -26 dB overload.
暂无评论