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Video telephony is increasingly being adopted by end consumers. It is extremely challenging to deliver video calls over wireless networks. In this paper, we conduct a measurement study on three popular mobile video call applications: Face-Time, Google Plus Hangout, and Skype, over both WiFi and Cellular links. We study the following questions: 1) how they encode/decode video in realtime under tight...
Video telephony requires high-bandwidth and low-delay voice and video transmissions between geographically distributed users. It is challenging to deliver high-quality video telephony to end-consumers through the best-effort Internet. In this paper, we present our measurement study on three popular video telephony systems on the Internet: Google+, iChat, and Skype. Through a series of carefully designed...
Aiming at cascade multilevel static reactive compensation device, this paper presents a SPWM pulse generating method Based on asymmetry regular sampling, and has developed a PWM pulse generator depending on the field programmable logic gate array (FPGA). Take multilevel cascade H bridge static reactive compensator as an example, it analyzes the pulse generating timing sequence of the asymmetry regular...
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