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To minimize packet loss caused by bandwidth probing, a video congestion control algorithm may use forward error correction (FEC) to reproduce dropped packets. Unfortunately, if a dominant part of the competing flows adds redundancy, the extra overhead may cause increased packet loss ratios in the network, and in turn do more harm than good. In this paper however, we demonstrate both analytically and...
This paper examines the call set-up delay (CSD), a performance parameter that may be used in specifying, measuring, and comparing the speed of call set-up processing in networks that employ the session initiation protocol (SIP), in establishing and terminating media sessions (calls) between users. One of the most important standardized technologies that use SIP in this way is the IP multimedia subsystem...
This paper proposed a two layer authorization mechanism, including traditional password system and rhythm recognition. The whole system includes two phases: preprocessing and usual operation for users. In preprocessing phase, users type password in a specific rhythm in order to record and analyse the characteristics of behaviour of users. In the second phase, how to verify a user in usual operation...
To solve the problem of query-by-example in multimedia audio data, we analyze the characteristics of wavelet multiresolution, wavelet packet transform and it’s best base, and propose a method for searching audio data using wavelet packet best base and wavelet multiresolution pyramidal algorithm. First, we preprocess 100 audio data files by transforming them into best base coefficient and wavelet coefficient...
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