Description: 为了测量 DVD的Jitter ,需要知道刻录时钟。针对 DVD 特殊的数据格式 NRZI,提出一个专用的时钟恢复系
统 ,用于从读出的 RF信号中恢复写时钟。这个系统采用基于锁相环的双环结构。介绍系统结构、各个模块的构成原理、数
学模型 ,并结合 Simulink 给出仿真结果。理论和实验证明 ,该系统既可作为测量 DVD Jitter 的硬件电路设计的参考 ,也可作
为软件设计的工具。-DVD to the Jitter measurement, the burning need to know the clock. DVD special against the NRZI data format, a dedicated clock to restore the system, From time for the RF signal was restored clock. The system based on the dual-loop PLL structure. On the structure, the various modules of the composition theory, mathematical model, and is integrated Simulink simulation results. Theory and experiment proved that the system can measure DVD Jitter as the hardware circuit design reference can also be used as the design of software tools. Platform: |
Size: 405956 |
Author:熊静 |
Hits:
Description: 为了测量 DVD的Jitter ,需要知道刻录时钟。针对 DVD 特殊的数据格式 NRZI,提出一个专用的时钟恢复系
统 ,用于从读出的 RF信号中恢复写时钟。这个系统采用基于锁相环的双环结构。介绍系统结构、各个模块的构成原理、数
学模型 ,并结合 Simulink 给出仿真结果。理论和实验证明 ,该系统既可作为测量 DVD Jitter 的硬件电路设计的参考 ,也可作
为软件设计的工具。-DVD to the Jitter measurement, the burning need to know the clock. DVD special against the NRZI data format, a dedicated clock to restore the system, From time for the RF signal was restored clock. The system based on the dual-loop PLL structure. On the structure, the various modules of the composition theory, mathematical model, and is integrated Simulink simulation results. Theory and experiment proved that the system can measure DVD Jitter as the hardware circuit design reference can also be used as the design of software tools. Platform: |
Size: 405504 |
Author:熊静 |
Hits:
Description: TCP友好的多媒体通信仿真，有如下特点：
支持MPEG4文件，支持CBR/VBR UDP流，支持AIMD流媒体控制-The power and connectivity of today s Internet presents the opportunity for interactive multimedia applications across the world. However, today s Internet has been predominantly designed for TCP traffic, wherein the end hosts recognize lost packets as congestion and reduce their transmission rates appropriately. Unfortunately, TCP is not the protocol of choice for multimedia applications, because TCP s lossless transmission is stricter than required by multimedia flows and TCP adds considerable network jitter, greatly decreasing multimedia quality. UDP, the alternate transport protocol to TCP, does not respond to packet loss as a measure of congestion, often resulting in UDP flows that get an unfair share of their network bandwidth. In this work, we demonstrate that a proper network protocol can be built on top of UDP, providing well-behaved performance in the face of congestion. Moreover, we demonstrate such protocols provide far better multimedia performance than does TCP.
Platform: |
Size: 237568 |
Author:胡胜红 |
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Description: Iperf是一个网络性能测试工具。可以测试TCP和UDP带宽质量，可以测量最大TCP带宽，具有多种参数和UDP特性，可以报告带宽，延迟抖动和数据包丢失。-Iperf is a network performance testing tools. To test TCP and UDP bandwidth, quality, and can measure the maximum TCP bandwidth, with a variety of parameters and UDP characteristics, can report the bandwidth, delay jitter and packet loss. Platform: |
Size: 248832 |
Author:xibeixue |
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Description: Mausezahn 是一个采用C开发的快速的网络包生成工具。让您发送几乎一切可能的和不可能的数据包。它主要用于测试VoIP或组播的网络，但也为安全审计，以检查是否你的系统是强化具体的攻击不够。-Mausezahn is a free fast traffic generator written in C which allows you to send nearly every possible and impossible packet. It is mainly used to test VoIP or multicast networks but also for security audits to check whether your systems are hardened enough for specific attacks.
Mausezahn can be used for example:
As traffic generator (e. g. to stress multicast networks)
To precisely measure jitter (delay variations) between two hosts (e. g. for VoIP-SLA verification)
As didactical tool during a datacom lecture or for lab exercises
For penetration testing of firewalls and IDS
For DoS attacks on networks (for audit purposes of course)
To find bugs in network software or appliances
For reconnaissance attacks using ping sweeps and port scans
To test network behaviour under strange circumstances (stress test, malformed packets, ...) Platform: |
Size: 913408 |
Author:susu |
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Search - measure-jitter.a