The software and hardware design of portable digital testing equipment based on tms320vc5510 are presented , which is the newly efficient and low power consuming dsp of ti corporation . the system realizes the requirement of sample theorem when sampling the wide spectrum signal with an equivalent sample technology , integrates the lcd control core in cpld and makes cpld as lcd controller instead of specific lcd controller , and makes the colorful stn - lcd as terminal displaying facility . the system suits the development requirement of the new portable digital testing equipment with the specialities of low power consuming , high integration and good displaying interface 本文介绍了以ti公司新一代高效率、低功耗数字信号处理器tms320vc5510为核心实现的便携式测试设备的软硬件设计,以等效采样技术实现采样宽频谱周期信号对采样定理的要求,在cpld内集成完整的lcd控制核代码,并以cpld作为lcd控制器取代专用控制器,以stn彩色lcd作为终端显示设备,该方案具有功耗低、集成度高、良好的人机接口等特点,适合新一代便携式测试设备的发展需求。
Above all , the optical propagation characteristics in crystals are studied in detail . derived from impulse response and sampling theorem in electronics , we establish the mathematical model of pif constructed by a series of birefringent crystal retarders with arbitrary azimuths sandwiched between two polarizers 本论文首先深入分析光在晶体中的传播特性,借鉴电学中的脉冲响应和采样定理,建立由前后两个偏振片之间夹放一系列角度任意延迟片构成的偏振干涉滤光片数学模型,并分析了其脉冲响应特性。
On the basis of high speed hybrid filter banks adc system , a kind of downsampler model based on bandpass sampling theorem is presented , and analyzed , proved in time and frequency domain , in addition a downsampler is designed according to the model . a class of high effective hybrid filter banks adc system which bases on the downsampler and radio frequency spectrum is proposed , of which digital signal rate falls m times as fast as the former 作者提出了一种基于带通采样定理的抽取器数学模型,对该数学模型进行了时域、频域的分析证明后,设计了一种基于该数学模型的抽取器,进而根据无线电射频信号频谱的特点,提出了高效混合滤波器组adc系统,其数字信号输出速率比高速混合滤波器组adc系统降低m - 1倍。
Software radio which promises well needs a kind of wideband high speed and resolution adc , but at present it is hard to realize . on the basis of the theory of multirate signal processing , the theory of filters , bandpass sampling theorem and adc principium , perfect reconstruction quadrature mirror filter ( prqmf ) banks adc system is proposed 基于此背景,本文在融合多速率数字信号处理理论、滤波器理论、带通采样定理以及adc原理的基础上,提出了prqmf滤波器组adc系统,并对该adc系统的原理、结构、特性进行了探讨和研究,其主要结论和创新之处如下: 1
Then , a new adaptive , on - line , fast samplingstrategy - multi - scaling sampling - is presented inspired by mra multi - resolution analysis and shannon sampling theorem , for quicklyobtaining acceptably approximate association rules at appropriate samplesize . both theoretical analysis and empirical study have showed that thesampling strategy can achieve a very good speed - accuracy trade - off 但是,取样策略必须在算法的效率和结果的精确性之间进行很好的折中, “如何确定合适的样本大小使得运行于其上的关联规则挖掘满足精确性的要求取样复杂性”成为这一方法的关键难解问题。
The bottleneck of hybrid filter banks adc system is that it cannot sample directly higher radio frequency signal because of lower analog input bandwidth of its adc . in order to remove it , a kind of downsampler model based on nyquist and bandpass sampling theorem is presented , analyzed and proved in time and frequency domain , in addition a downsampler is designed according to the model . on the basis of hybrid filter banks adc system , a class of high speed hybrid filter banks adc system is proposed 针对混合滤波器组adc系统因其adc模拟输入带宽低而不能对频率较高的射频模拟信号进行模/数转换的瓶颈,作者提出了一种基于nyquist采样定理和带通采样定理的抽取器数学模型,对该数学模型进行了时域、频域的分析证明后,设计了一种基于该数学模型的sha抽取器,进而在混合滤波器组adc系统的基础上,提出了高速混合滤波器组adc系统。