Commercially available active noise control headphones rely on fixed analog controllers to drive "anti-noise" loudspeakers. Our design uses an adaptive controller to optimally cancel unwanted acoustic noise. This headphone would be particularly useful for workers who operate or work near heavy machinery and engines because the noise is selectively eliminated. Desired sounds, such as speech and warning signals, are left to be heard clearly. The adaptive control algorithm is implemented on a Texas Instruments (TI™ ) 1 TMS320C30GEL digital signal processor (DSP), which drives a Sony CD550 headphone/microphone system. Our experiments indicate that adaptive noise control results in a dramatic improvement in performance over fixed noise control. This improvement is due to the availability of high-performance programmable DSPs and the self-optimizing and tracking capabilities of the adaptive controller in response to the surrounding noise.
標簽： Commercially controllers headphones available
上傳時間： 2013-12-04
上傳用戶：dyctj
What you always wanted to know about networking but were afraid to ask! * How networks and the Internet work * How to build coherent, cost-effective network infrastructures * How to design networks for maximum reliability and availability * What you need to know about data center and application networking * How to secure networks against today?s threats and attacks * How to take advantage of the latest mobility technologies * How virtualizing networks can help businesses leverage their network investments even further * How to combine messaging, calendaring, telephony, audio, video, and web conferencing into a unified communications architecture
標簽： networking networks always afraid
上傳時間： 2013-12-25
上傳用戶：fandeshun
This product has been retired and is not recommended for new designs. For new designs, S25FL040A supersedes S25FL004A. Please refer to the S25FL040A for specifications andordering information. availability of this document is retained for reference and historical purposes only
標簽： 模型
上傳時間： 2015-06-16
上傳用戶：mingjieji
This product has been retired and is not recommended for new designs. For new designs, S25FL040A supersedes S25FL004A. Please refer to the S25FL040A for specifications andordering information. availability of this document is retained for reference and historical purposes only
標簽： flash模型
上傳時間： 2015-06-16
上傳用戶：mingjieji
Improved guaranteed cost control and quantum adaptive control are developed in this study for a quadrotor helicopter with state delay and actuator faults. Improved guaranteed cost control is designed to eliminate disturbance effects and guarantee the robust stability of a quadrotor helicopter with state delay. The inapplicability of guaranteed cost control to the quadrotor linear model is addressed by combining guaranteed cost control with a model reference linear quadratic regulator. In the event of actuator faults, quadrotor tracking performance is maintained through quantum adaptive control. Finally, the availability of the proposed scheme is verified through numerical simulation
標簽： Control Helicopter Guaranteed Quadrotor Adaptive Strategy Improved Quantum Delay State
上傳時間： 2017-07-15
上傳用戶：bingzi_ml
With the advancement of technology and miniaturization of electronic devices, applications of wireless sensor networks (WSNs) can be seen in diverse areas in our lives. In fact, these WSNs have gained a lot of attention from both the research community and industry, making them easily available on the market. An extensive amount of research, easy availability, and cheap cost make them useful in various types of futuristic applications as well.
標簽： Communication Technologies Emerging
上傳時間： 2020-05-27
上傳用戶：shancjb
During the past decade, many wireless communication techniques have been developedto achievevariousgoals suchas higherdata rate,morerobustlink quality, and higher number of users in a given bandwidth. For wireless communication systems, depending on the availability of a feedback link, two approaches can be considered: namely open and closed loop. Open loop communication system that does not exploit the channel knowledge at the transmitter is now well understood from both a theoretical and practical point of view.
標簽： Communication Strategies Feedback Wireless for
上傳時間： 2020-05-27
上傳用戶：shancjb
This book addresses two aspects of network operation quality; namely, resource management and fault management. Network operation quality is among the functions to be fulfilled in order to offer quality of service, QoS, to the end user. It is characterized by four parameters: – packet loss; – delay; – jitter, or the variation of delay over time; – availability. Resource management employs mechanisms that enable the first three parameters to be guaranteed or optimized. Fault management aims to ensure continuity of service.
標簽： Ethernet Networks MPLS and IP
上傳時間： 2020-05-27
上傳用戶：shancjb
Theartofcomputationofelectromagnetic(EM)problemshasgrownexponentially for three decades due to the availability of powerful computer resources. In spite of this, the EM community has suffered without a suitable text on the computational techniques commonly used in solving EM-related problems. Although there have been monographs on one particular technique or another, the monographs are written for the experts rather than students. Only a few texts cover the major techniques and dothatinamannersuitableforclassroomuse.Itseemsexpertsinthisareaarefamiliar with one or a few techniques but not many seem to be familiar with all the common techniques. This text attempts to fill that gap.
標簽： Electromagnetics Techniques Numerical in
上傳時間： 2020-05-31
上傳用戶：shancjb
Rapid growth of wireless communication services in recent decades has created a huge demand of radio spectrum. Spectrum scarcity and utilization inefficiency limit the development of wireless networks. Cognitive radio is a promising tech- nology that allows secondary users to reuse the underutilized licensed spectrum of primary users. The major challenge for spectrum sharing is to achieve high spectrum efficiency while making non-intrusive access to the licensed bands. This requires in- formation of availability and quality of channel resources at secondary transmitters, however, is difficult to be obtained perfectly in practice.
標簽： Opportunistic Spectrum Sharing
上傳時間： 2020-05-31
上傳用戶：shancjb
