编码器

Then, on the basis of the functional verification, the system architectures of the radio frequency analog front end and the control logic circuit for the passive UHF RFID transponder are studied and designed with low-power design techniques. The RF AFE circuit includes rectifier, matching network, backscatter, regulator, AM demodulator, voltage reference, local oscillator and power on reset circuit, and so on. The control logic circuit contains clock synchronization module, decoding module, coding module, cyclic redundancy checksum module, power management unit, control unit, shift register and memory.

然后，在功能验证的基础上，重点研究了无源超高频射频识别标签芯片射频模拟前端电路和控制逻辑电路的系统架构，并采用低功耗设计技术对其进行了设计，射频模拟前端电路设计包括了整流器、匹配网络、反向散射电路、稳压器、AM解调器、电压参考源、本地振荡器以及上电复位电路等，控制逻辑电路设计包括了时钟同步模块、解码模块、编码模块、CRC校验模块、功率管理单元、控制单元、移位寄存器和存储器等。

For the partial products generation, the novel method of Booth encoding combined with partial products generating is put up, which can directly map the multiplicand and multiplicator to partition products without generating the BOOTH encoding results. For the optimization of Wallace tree adding, the series formulas of full-adder and 4-2 Compressor realization are introduced to guidance the selection. For the non-bias round, forwarding round disposal in Wallace tree method is brought forward to avoid the final multi-bit adder. Also, the idea of delay-oriented partition of the MAC frame is put up to achieve the perfect match with multi-pipeline DSP architecture.

提出了一种构建多模式算法最小并集的MAC通用结构思想与一种划分MAC通用结构以适应多流水级DSP处理器设计的通用MAC设计方法；对于BOOTH编码和部分积产生，提出了直接建立被乘数与部分积的多路选择映射关系的BOOTH编码和部分积联合产生方法；对于最优Wallace树型加法实现，提出了全加器和4-2 compressor电路实现Wallace树加法所需的关键加法路径级数公式以指导实现选择；对于无偏舍入处理，提出了在Wallace树处理舍入问题的舍入运算前置方法；提出了以时延为导向的MAC各部分单元组合与流水线匹配具体方法。

The thesis also gives the estimated upper bounds of error decision probability. When the compressor is confined to be a lattice vector quantizer, a explicit mathematic equation for the rate of the performance convergence to the optimum is derived. On the other hand, Distortion Ratio Aproachs to the design of testing system on the basis of vector quantization are put forward, and methods for building the variable length decision tree as well as the fixed length one presented.

在算法方面，提出了失真比矢量量化检验器的设计方法以及可变长和固定码长分类判决树的生成算法；为了解决以矢量量化器为核心的处理系统运算量大，不易实时实现的问题，论文中引入了熵减的概念，在此基础上提出一种快速最近邻搜索编码方法，理论分析及实验结果均证实了这种算法的有效性。

Segment vocoder is an efficient very low bit rate speech coding algorithm.Speech segment method,one of the key technology of segment vocoder,is studied and a new algorithm is presented.

分段声码器是一种高效的低速语音编码方法，针对分段声码器实现的关键技术语音分段方法进行了研究，提出了一种分段新算法。

The algorithm first used KNNModel to build multiple clusters on a given dataset and chose few clusters for each class as representatives to construct a hieratical coding matrix in training phase, and then the matrix was used to train each single classifier.

该算法在训练阶段先通过KNN模型算法在数据集上构建多个同类簇，选取各类中最具代表性的簇形成层次编码矩阵，然后再根据编码矩阵进行单分类器训练。

The result shows that the output amplitude and linearity of phase interpolator is primarily related to the difference between the two input phases.

分析结果表明相位插值器输出时钟的相位和幅度强烈地依赖于插值器输入时钟间的相位差，同时提出一种新的编码方法来补偿相位的非线性。

The result shows that the output ampli-tude and linearity of phase interpolator is primarily related to the difference between the two input phases.

分析结果表明相位插值器输出时钟的相位和幅度强烈地依赖于插值器输入时钟间的相位差，同时提出一种新的编码方法来补偿相位的非线性。

A7800 Features: 10 Mb s Manchester encoding decoding with receive clock recovery Patented digital phase locked loop decoder re- quires no precision external components Decodes Manchester data with up to g18 ns of jitter Loopback capability for diagnostics Externally selectable half or full step modes of opera- tion at transmit output Squelch circuits at the receive and collision inputs re- ject noise High voltage protection at transceiver interface (16V) TTL MOS compatible controller interface Connects directly to the transceiver cable A7800 Maximum Ratings: A7800 Pinout:· NPT IGBT technology · low saturation voltage · low switching losses · switching frequency up to 30 kHz · square RBSOA, no latch up · high short circuit capability · positive temperature coefficient for easy parallelling · MOS input, voltage controlled · ultra fast free wheeling diodes · solderable pins for PCB mounting · package with copper base plate

A7800特点： 10兆s曼彻斯特编码与接收时钟恢复专利解码数字锁相环解码器重新奎雷斯没有精确数据的外部元件曼彻斯特解码高达全部G18抖动纳秒环回功能用于诊断外部可选的一半或整步模式的歌剧和灰在传输和接收碰撞投入重新ject高噪音在收发器接口（16V的）马鞍山的TTL兼容控制器接口电压保护输出静噪电路直接连接到收发器的电缆 A7800最大额定值： A7800引脚说明：·不扩散核武器条约IGBT技术·低饱和电压·低开关损耗·开关频率可达30千赫·平方米RBSOA，没有锁定了高短路能力··正温度，便于parallelling·马鞍山消耗系数，电压控制·超高速免费·印刷电路板焊接的引脚安装·铜底板包续流二极管

Secodely , introduces the FPGA implementation of the DVB-T coder and modulator , some of the core arithmetic , such as , inner coding , inner-interleaving ( bit-wise / symbol interleaver ), signal constellations and mapping , OFDM frame structure are detailed .

然后，详细描述了DVB-T信道编码调制器中的部分核心算法的FPGA电路设计、调试和实现，包括内编码、内交织(包括比特交织和符号交织)、星座映射、帧形成等。

But because the DSP cost is so high, it limites the utility of G.723.1 decoder. Using ASIC to design G.723.1 decoder can reduces the cost, in order to let it be used in more domains.

通用DSP成本较高，若设计专用的G.723.1编解码器ASIC芯片，可有效降低成本，利于G.723.1编码解码器在更广泛的领域应用。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。