基于ATmega32L单片机的语音采集系统设计及实现

WM8731L因其高性能、低功耗、可变语音采集速率等特性,在便携式语音系统中有着广泛的应用。文章介绍了一种以ATmega32L单片机为主控模块,WM8731L为语音采集模块的语音感知平台的设计和实现,详细阐述了ATmega32L单片机对WM8731L芯片的控制原理及方法,并介绍相关硬件、软件的设计及实现。     

基于FPGA的语音录制与回放系统

系统用FPGA实现了I2C总线控制器,以Altera公司的NiosⅡ嵌入式软处理器为核心,结合高品质数字信号音频编/解码芯片WM8731成功地实现了语音的录制及回放功能,同时利用Matlab7.0.4软件对所采集的语音数据进行仿真。系统采用SoPC技术,自行设计采集模块和I2C协议驱动模块,并通过AWALON总线挂载在Nios软核上实时高速采集与回放。实践表明,系统具有集成度高,稳定性好,实时性强的特点。     

一种大功率数字音频系统设计

音频编解码芯片WM8731因其高性能、低功耗等优点在很多音频产品中得到了广泛应用。本文提出了WM8731与FPGA的音频编解码系统,并嵌入大功率D类功放技术作为音频系统的功率放大应用,使得本系统效率高,体积小,音质高,性能显著。     

基于DSP的多路音频信号采集与处理设计

设计了一种基于DSP的实时语音处理系统,并结合TMS320DM642与音频CODEC芯片TLV320AIC23B的接口特点,详细阐述了多通道音频串行端口(McASP)和4片TLV320AIC23B连接方法。同时给出了详细的软件实现方法,从而实现4路音频信号的同时采集。对采集到音频信号进行滤波算法处理,并通过CCS3.3在计算机上实时显示处理后的波形,实现了一个完整的音频信号处理系统,可以对模拟音频信号采集、滤波和回放。     

基于FPGA的音频播放系统设计

介绍了基于FPGA的嵌入式数字音频播放系统的设计.该设计在FPGA上利用WM8731编/解码芯片,通过配置SOPC中的NiosⅡ软核CPU和相关的接口模块来实现嵌入式系统的主要硬件结构,并结合软件设计来控制音频编/解码芯片和SD卡,实现了音频信号的D/A转换、存储、播放等功能.由于采用了SOPC技术,使得该系统具有集成...     

电台音频采集管理系统设计

针对电台接收信号依赖于人工值守还未实现自动化接收的问题,在软件无线电的理论基础上,提出一种电台音频采集管理系统总体技术方案,并设计了一款电台外接的电台音频处理终端,旨在电台工作时终端可以自动采集、记录、识别及回放接收到的音频信号,以提高信号接收效率。该终端由通用软件无线电模块、Morse音频信号处理模块以及语音识别模块构成,模块之间相互独立,具有一定的通用性和实用性。     

基于SOPC的呼吸音检测系统分析

文章介绍了一套由SOPC开发平台DE2实现的呼吸音检测系统,该平台核心为Altera的FPGA及内嵌的软核NIOSⅡCPU。该系统以24位音频编解码芯片WM8731进行呼吸音的采集与回放,利用短时能量、短时过零率以及时自相关分析确定呼吸音的起止,然后利用数字滤波器、FFT变换、线性预测分析等技术提取呼吸音相关参数,并用DTW算法进行综合匹配进行识别。实验结果表明,该系统可以高效识别多种呼吸音。     

基于DSP的语音信号采集系统研究与设计

设计了一种基于DSP的语音信号采集系统,并根据设计思路分别给出了系统各模块的功能和实现方式。该系统能够完成对音频信号的实时采集和数字处理,还具有存储、与上位机进行串口通信等功能     

基于ADPCM的数字语音存储与回放系统

系统以单片机和FPGA为控制核心,实现了语音存储与回放系统。能够采集模拟语音信号以及耳机立体声信号,以ADPCM（自适应差分编码）的方式提高了存储器的利用率,语音存储时间可达2 min;基于短时傅里叶变换原理,实现了语音信号的频谱分析与实时显示。同时,利用立体声音频功放播放语音,每声道音量可调并具有静噪功能。此外,系统还采用预加重、去加重、抗混叠滤波等措施,有效地提高了信噪比。语音回放质量良好,存储时间较长。     

基于DSP的语音信号处理系统设计

本文研究了基于DSP的语音信号处理系统,分析了TI公司的信号处理器TMS320VC5402与音频模拟芯片TLC320AC01(以下简称AC01)的结构特点,描述了两者之间的多通道缓冲串口的硬件连接,并给出了相关软件设计,实现了一个完整的语音信号数字化处理系统,可以对模拟语音信号进行采集、滤波、回放。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first