A Single-chip Universal Serial Bus D/A Converter For High-quality Audio Signals

1997 ◽  
Author(s):  
Janssen
Keyword(s):  
Single Chip ◽  
Audio Signals ◽  
Universal Serial Bus ◽  
High Quality

Development and Design of Dance Robot Based on Single-Chip Microcomputer AT90S8535

2011 ◽  
Vol 383-390 ◽  
pp. 157-162 ◽  
Author(s):  
Yue Mei Han
Keyword(s):  
Electric Motor ◽  
Hardware Design ◽  
Main Program ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
High Quality ◽  
Mechanical Structure ◽  
Robot Technology ◽  
Motion Mode

With the development of robot technology some robots have been seen in the field of entertainment. Dance robot’s mechanical structure is the motion mode with several free degrees drove by electric motor. The blocking idea was impenetrate in hardware design and the CPU was high-quality single-chip AT90S8535.The technology PWM with width modulation combined with three subprograms and main program were adopted in the software so that the dance robot can complete all the action arranged in advance.

scholarly journals Adaptive Variable Degree- Zero-Trees for Re-Encoding of Perceptually Quantized Wavelet Packet Transformed Audio and High-Quality Speech

2011 ◽  
Vol 2011 ◽  
pp. 1-16
Author(s):  
Omid Ghahabi ◽  
Mohammad Hassan Savoji
Keyword(s):  
Wavelet Packet ◽  
Low Complexity ◽  
Set Partitioning ◽  
Degree Zero ◽  
Variable Degree ◽  
Audio Signals ◽  
High Quality ◽  
Scalable Algorithm ◽  
Hierarchical Trees ◽  
Zero Tree

A fast, efficient, and scalable algorithm is proposed, in this paper, for re-encoding of perceptually quantized wavelet-packet transform (WPT) coefficients of audio and high quality speech and is called “adaptive variable degree- zero-trees” (AVDZ). The quantization process is carried out by taking into account some basic perceptual considerations and achieves good subjective quality with low complexity. The performance of the proposed AVDZ algorithm is compared with two other zero-tree-based schemes comprising (1) embedded zero-tree wavelet (EZW) and (2) the set partitioning in hierarchical trees (SPIHT). Since EZW and SPIHT are designed for image compression, some modifications are incorporated in these schemes for their better matching to audio signals. It is shown that the proposed modifications can improve their performance by about 15–25%. Furthermore, it is concluded that the proposed AVDZ algorithm outperforms these modified versions in terms of both output average bit-rates and computation times.

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