Convolutional neural network for robust pitch determination

Pitch is an important characteristic of speech and is useful for many applications. However, pitch determination in noisy conditions is difficult. In this paper, we propose a supervised learning algorithm to estimate pitch using a convolutional neural network (CNN). Specifically, we use a CNN for pitch candidate selection, and dynamic programming for pitch tracking. Our experimental results show that the proposed method can obtain accurate pitch estimation and they show good generalization ability to new speakers and noisy conditions. We credit the success to the use of CNN, which is suitable for modeling the shift-invariant spectral feature for pitch detection.

发电机定子绕组接地保护整定原则

根据定子接地(100%)保护原理及配置方法,详细分析了双频式定子接地和外加电源注入式定子接地(100%)保护的整定原则和方法,并分别对这两种原理的定子接地保护的灵敏度进行验算,通过实例对各原理的定子接地保护的定值整定和保护灵敏度进行了对比分析.研究结果表明,定子接地保护除了有完善的保护原理判据外,还要有合理的保护动作值整定原则和方法,才能保证定子接地(100%)保护的性能.

数据产品经理:解决方案与案例分析

这是一本能帮助读者快速获取数据产品实战能力数据项目实战能力的著作.全书内容以案例方式组织,围绕数据建设,数据营销,数据驱动3大主题,用14个综合案例进行完整再现和深度复盘,为近10个行业的数据产品提供了可直接参考的解决方案,这些方案同时也适用于其他行业.每个案例从项目背景,方案设计,实现过程,总结与思考等维度展开阐述,层次清晰,可参考性强.全书共14章,分为三部分:数据建设,数据营销和数据驱动.第1部分 数据建设(第1~2章)数据建设是数据运转的基础,是数据发挥价值的关键.良好的数据建设能够降低数据应用的开发成本,提升数据使用者的效率.本部分包含两章,分别介绍了自动化数据分析平台的搭建和数据埋点的工作流程等.第二部分 数据营销(第3~9章)营销是每个公司的业务核心,良好的数据营销平台为营销提供非常大的助力.本部分主要介绍如何利用数据中台,大数据平台助力营销,如何利用社会化聆听辅助商业决策,重点分析金融,零售,快消,汽车,游戏等多个行业的项目,具有较高的参考价值.此外,还介绍了商品分析方法和初创公司数据运营实践.第三部分 数据驱动(第10~14章)数据产品经理可以进驻公司的每个部门,驱动该部门的业务发展,成为公司运转的核心和动力.本部分介绍的案例包括语音数据处理与商业应用,网约车安全性的数据化解决方案,智慧安防中的智能视频产品,AI技术在视频平台上的应用,数据产品经理在推荐中的价值,这些案例都属于数据产品的一个分支——策略产品的范畴,有的案例主要以AI技术实现.

Implementation of Bilinear CFA Interpolation and VGA Display Controller Based on FPGA

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Adaptive Backstepping Control for Constrained Systems Using Nonlinear Mapping

In this paper,a novel nonlinear mapping based adaptive backstepping control is presented for nonlinear systems with output constraint to overcome the problems faced by barrier Lyapunov function based backstepping control,such as complex controller structure,small set for initial value of constrained output and extra parameters employment.The constrained output can take any initial value within the output constrained space,so added flexibility is achieved in the control design.By mapping the constrained output into the real number set,the backstepping control design can be directly used for the transformed system,while simultaneously prevent the constraints from being violated.A similar convergence feature is proved between the system and its mapping,so that the stability of the closed-loop system is guaranteed in the sense that all closed-loop signals are uniformly bounded and the tracking error converges to zero asymptotically.Simulation results demonstrate the efectiveness of the proposed control.

Application of GPRS technology in automatic meter reading system

A new automatic meter reading system based on GPRS (General Packet Radio Service) ispresented to meet the demands for the reliability and real time performance of data communication. This scheme utilizes direct connection between GPRS network and internet, setting a server in In-ternet to take the charge of data communication between master station and terminal units for real-time data acquisition and transfer. Its structure and operational principle are introduced in detail. It is characterized by higher speed, great data throughput,teal-time performance and reliable communication. Its application in Dezhou Power Supply Company is proved successful and steady.