24位AD转换芯片ADS1210测量精度的提高

介绍了一种24位高精度∑-△型AD转换芯片ADSl210，详细阐述了该芯片在实际使用中如何提高测量精度。     

基于DSP的语音录放、存储及传输系统

在分析PC机ISA总线结构和PnP协议规范的基础上，结合DSP芯片自身的特点，通过扩展DSP的中断和DMA功能，实现了DSP对网卡和声卡的直接操作，从而设计了一套基于DSP的高性能语音录放、存储及传输系统。     

Baseline drift effect on the performance of neutron and γ ray discrimination using frequency gradient analysis

Frequency gradient analysis (FGA) effectively discriminates neutrons and γ rays by examining the frequency-domain features of the photomultiplier tube anode signal. This approach is insensitive to noise but is inevitably affected by the baseline drift similar to other pulse shape discrimination methods. The baseline drift effect is attributed to factors such as power line fluctuation, dark current, noise disturbances, hum, and pulse tail in front-end electronics. This effect needs to be elucidated and quantified before the baseline shift can be estimated and removed from the captured signal. Therefore, the effect of baseline shift on the discrimination performance of neutrons and γ rays with organic scintillation detectors using FGA is investigated in this paper. The relationship between the baseline shift and discrimination parameters of FGA is derived and verified by an experimental system consisting of an americium-beryllium source, a BC501A liquid scintillator detector, and a 5 GSample/s 8-bit oscilloscope. The theoretical and experimental results both show that the estimation of the baseline shift is necessary, and the removal of baseline drift from the pulse shapes can improve the discrimination performance of FGA.     

基于DSP的10Mbit／s共享以太网络设计

文章通过设计DSP芯片TMS32 0F2 0 6与具有ISA总线接口的 10Mbit/s以太网络控制器RTL80 19AS的软、硬件接口 ,实现了基于DSP的 10Mbit/s共享以太网络结构     

DSP对声卡的直接操作访问

1 引言 数字技术的发展日新月异,数字信号处理器（DSP）在通信、语音处理、军事、仪器仪表、图像处理等领域也得到越来越广泛的应用。在以DSP为核心的处理系统中,可能会遇到DSP对其它硬件如声卡、网卡、存储器等的直接操作与控制问题。本文通过分析声卡的基本原理,解决了DSP对声卡的初始化问题,从而实现了DSP对声卡的直接操作。2 声卡的基本原理和硬件结构 图1给出典型声卡的硬件工作原理。 主机通过总线将数字化的声音信号以PCM编码方式送到数模转换器（D／A）,将数字信号转换成模拟的音频信号,同时又可以通过模数转换器（A…     

20位Σ-Δ立体声ADA电路TLC320AD75C的接口电路设计

文中介绍了Σ-Δ型ADC及DAC的特点及构成,并详细论述了Σ-Δ型立体声ADA电路TLC320AD75C的模拟与数字音频数据接口技术、DAC的串行控制接口技术及该类器件的使用注意事项.     

全数字化语言教学实验室教师机单元的设计

文章针对全数字化语言教学实验室对教师机单元提出的要求 ,利用五片双端口RAM建立了PC与主DSP、主DSP与四个从DSP之间的紧耦合多机系统 ,并提出了系统中的通信协议和设计了系统上的软件。     

Digital discrimination of neutron and γ ray using an organic scintillation detector based on wavelet transform modulus maximum

A novel algorithm for the discrimination of neutron and γ -ray events with wavelet transform modulus maximum (WTMM) in an organic scintillation has been investigated. Voltage pulses arising from a BC501A organic liquid scintillation detector in a mixed radiation field have been recorded with a fast digital sampling oscilloscope. The WTMM method using frequency-domain features exhibits a strong insensitivity to noise and can be used to discriminate neutron and γ -ray events based on their different asymptotic decay trend between the positive modulus maximum curve and the negative modulus maximum curve in the scale-space plane. This technique has been verified by the corresponding mixed-field data assessed by the time-of-flight (TOF) method and the charge comparison (CC) method. It is shown that the characterization of neutron and γ ray achieved by the discrimination method based on WTMM is consistent with that afforded by the TOF method and better than the CC method. Moreover, the WTMM method itself has presented its ability to eliminate the noise without any pretreatment to the pulses.     

可编程开关电容滤波器时钟产生电路的程控调节

针对使用可编程开关电容滤波器过程中出现的时钟产生电路的程控调节问题，通过理论分析和实验研究，提出了一个以ＭＡＸ０３８为核心的宽带可程控调节的频率合成器。     

动态降噪原理及其在语音辨识系统中的应用

根据对ＤＮＲ动态降噪系统原理的分析，给出了其原理在ＰＣ机中具体实现的算法，以及在语音辨识系统中的运用。