利用格密码的非对称性构造尺寸优化的隐藏认证不经意传输协议

在保持安全性的前提下,针对模格具有降低密钥尺寸和通信成本的优势,采用密钥交换构造方式并使用新型模转换技术,结合调和机制与高级对称加密算法,提出了一种简单的基于模格上的1-out-of-2不经意传输协议。利用非对称模—带误差学习问题,保证了协议发送方和接收方的隐私,证明了在随机预言机模型下的通用可组合安全性。基于提出的不经意传输协议,引入隐藏证书构造了隐藏认证的k-out-of-N不经意传输协议。利用非对称的模—带误差学习问题和非对称的模—短整数解问题,实现了接收方权限的隐藏认证。效率方面,协议使用的运算是小整数的模加和模乘,降低了通信成本,并且使用模转换技术有效地压缩了公钥尺寸和密文长度。

Mismatch Calibration Techniques in Successive Approximation Analog-to-Digital Converters

Comparator offset cancellation and capacitor self-calibration techniques used in a successive approximation analog-to-digital converter （SA-ADC） are described. The calibration circuit works in parallel with the SAADC by adding additional calibration clock cycles to pursue high accuracy and low power consumption, and the calibrated resolution can be up to 14bit. This circuit is used in a 10bit 3Msps successive approximation ADC. This chip is realized with an SMIC 0. 18μm 1.8V process and occupies 0.25mm^2 . It consumes 3. 1mW when operating at 1.8MHz. The measured SINAD is 55. 9068dB, SFDR is 64. 5767dB, and THD is - 74. 8889dB when sampling a 320kHz sine wave.

Novel Design for High Speed and Resolution Delta-sigma A/D Converter

The delta-sigma converter is one of the high speed and resolution analog-to-digital modulators. Its implementation needs the low oversampling technique and the multi-bit D/A converter. The noise induced by the multi-bit D/A converter becomes one of the key factors deteriorating the signal-to-noise rate of the delta-sigma A/D converter. A novel structure with signal unity transfunction, dynamic element matching(DEM) and noise-shaping is discussed. The method is investigated to design converter based on the proposed structure. The behavior simulation indicates that the structure and the design method are feasible.

Mathematical model of convection diathermanous coefficient of refrigerator car

It is analyzed that the influence factors on temperature field of refrigerator car. The mathematical model of convection diathermanous coefficient has been put forward. It is considered in the model that the parameters of wind speed , car speed , temperature of car surface , temperature of surroundings , etc. If the boundary conditions and parameters used in calculation model of convection transmits heat coefficient are confinned as following： the cold plank car velocity Vis 120 km/h, and air temperature is 25 ℃, and the atmosphere press is 1013250 Pa, and wind velocity Viis 10 m/s, and the length of car bodywork Lis 5 m, and bodywork surface temperature is 25 ℃. The results were obtained by the model： when the wind velocity direction is the same as car velocity, the coefficient Kof convection transmits heat is 51.4（W· m^-2· K^-1 ）, and when the wind velocity direction is against the car velocity, K is 90.58 （W ·m^-2· K^-1）.

Optimization and design of inter-stage amplifier with wide output swing,high speed and high accuracy

To satisfy the design requirements of analog-to-digital converter （ADC） of high speed sampling system in an infrared focal plane array tester with 1024 × 1024 pixels, a first inter-stage amplifier of 12-bit 40- Msample/s pipelined ADC was designed with 0. 35 μm CMOS technology. On the basis of traditional two-stage amplifier, the cross-coupled class AB output stage and cascode compensation were adopted to improve the output vohage swing and bandwidth. Power dissipation was optimized with math tools. Circuit and layout design were completed. Simulation results show that the designed amplifier has good performance of 95 dB dc gain, ±2 V output voltage swing, 190 MHz bandwidth and 63° phase margin with feedback factor 1/4, 33 mW power dissipation and so on, which can meet the system requirements.

A CODEBOOK COMPENSATIVE VOICE MORPHING ALGORITHM BASED ON MAXIMUM LIKELIHOOD ESTIMATION

This paper presents an improved voice morphing algorithm based on Gaussian Mixture Model(GMM) which overcomes the traditional one in the terms of overly smoothed problems of the converted spectral and discontinuities between frames.Firstly, a maximum likelihood estimation for the model is introduced for the alleviation of the inversion of high dimension matrixes caused by traditional conversion function.Then, in order to resolve the two problems associated with the baseline, a codebook compensation technique and a time domain medial filter are applied.The results of listening evaluations show that the quality of the speech converted by the proposed method is significantly better than that by the traditional GMM method, and the Mean Opinion Score(MOS) of the converted speech is improved from 2.5 to 3.1 and ABX score from 38% to 75%.

Feedback Filtering for Digital Control Applications

Thanks to the progress in semiconductor technologies, today microcontrollers offer huge computational power. That allows using advanced control algorithms with a built-in intelligence with a sufficient speed, for many demanding applications. These capabilities make the embedded control ideal for using at complex plants and for obtaining the highest performance in a wide area of operations. However, control performance also strongly depends on the feedback. A short latency and a high precision of embedded analog peripherals allow building fast and accurate control loops. The paper proposes an easy design method of high performance analog to digital converter filtering path, optimized for control applications.

探索DSD

曾几何时，互联网、杂志、报纸上关于DSD（Direct Stream Digital）的技术文章比比皆是，本人不想凑这个热闹，这里说的是另外一回事。