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In order to transmit live video or video streaming at low bit-rates, the encoder usually needs to reduce the frame rate to cope with the available bandwidth. In this paper, a new dynamic frame-skipping scheme for live video encoding based on motion detection in the adaptive length sliding window is proposed. The length of a sliding window can be adjusted according to bandwidth variation in order to...
In order to improve the rate of bandwidth utilization and achieve dynamic bandwidth allocation, in this paper, the video stream predication model of Kalman filter is improved according to linear prediction of future frames. The Kalman filtering owns a minimum mean square error estimate when the observed variables and noise are jointly Gaussian noise. Noise reduction is applied, and then the technology...
This paper presents a preliminary analysis of differences of formants among Shanghai, Guangzhou, Chongqing and Xiamen dialectal Putonghua (PTH) in China. An improved formant model based on the linear prediction (LP) feature analysis and a two-dimensional(2D) hidden Markov model (HMM) of formants is employed for estimation of the formant frequencies of vowels and diphthongs. The experiments show Guangzhou...
Regarding network, QoS is a very important issue. IPv6 will be a mainstream of the network in the two or five years. It is very significant to do more research on IPv6 QoS, which will do good to the development and large-scale application of IPv6. We have introduced QoS mechanisms and two different approaches to QoS on the Internet, analyzed current status of IPv6 QoS and mainly discussed some important...
This paper proposes the network model which supports QoS multicast. With the optimization of existing QoS multicast routing algorithms, this paper proposes the QoS multicast routing algorithm based on immune genetic method in NGN. The simulation results indicate that the algorithm has high convergence speed and reliability, and can meets the demand of QoS multicast in NGN well.
Network virtualization provides the feasibility of running multiple routing architectures on a shared physical infrastructure. This paper presents the design and evaluation of a bandwidth management algorithm which is based on traffic predictor. We generated the simulation traffic with the ARMAX/GARCH model. The basic idea of our design is that some failure in the MFP computation implies that one...
Since the shortage of spectrum resources, paper raises a improvement based on the user waiting time and bandwidth requirement of CSGC algorithm via the analysis of graph coloring model. The new algorithm takes into account both user waiting time and actual bandwidth requirements, so that minimize the total unsatisfied needs and users tend to equal access to spectrum resources. It ensures the fairness...
A proxy server is presented and divides the streaming media service that users access to in the 3G network into different types. According to the characteristics of service types, the proxy server uses different segmentation prefetching to improve the efficiency. Meanwhile, this paper introduces the assembly line technology which improves the speed of the streaming media distribution, effectively...
In this paper we investigate the frequency resolution of empirical mode decomposition (EMD) and explore means to improve it through a series of numerical experiments. Using a compound signal composed of two pure tones, we find the marginal frequency ratio at which EMD can no longer separate them into different intrinsic mode functions (IMFs). Based on this observation we determine the optimal frequency...
Self-similar burst traffic will reduce the link utilization and produce a longer latency, which affects real-time performance of the campus network. A simulation method of statistical multiplexing technology is proposed in this paper by using characteristics of packet/frame switch. We also allocate bandwidth and buffer reasonable. Thus the self-similarity traffic which impacts on the network can be...
As the complexity of the 3G mobile communications environment, the limitation of the wireless transmission frequency band resources, in order to achieve the transmission and reconstruction of low bit rate, high-quality audio signal, a modified EAAC+ mobile audio coding algorithm based on the existing technology of speech or audio bandwidth extension research is presented in this paper. The algorithm...
In this paper the transmission characteristics of the Hodrick-Prescott (HP) filter and the frequency-domain characteristics of China's gross domestic product (GDP) time series are studied. An 3dB bandwidth of HP filter is defined and the effect of the smoothing parameters on the macroeconomic time series is analyzed. We propose that the trend components for more high-precision can be obtained by interpolation...
Video-on-Demand (VoD) services are attractive but also expensive even after the participation of P2P networks. To achieve cost reduction, this paper proposes two mechanisms to enhance the contribution of P2P networks, i.e., storage compression and micropayment. The former greatly magnifies the storage capacity of peer nodes, while the latter establishes an effective user incentive for VoD services...
EMKC is an explicit congestion control algorithm which is designed for high bandwidth delay product (BDP) networks. Although delay-independence is an appealing characteristic, the EMKC system developed in exhibits undesirable equilibrium properties and slow fairness convergence behavior. To overcome these drawbacks, we propose a new method called MEMKC (Modified Exponential Max-Min Kelly Control)...
A new streaming media network-architecture based on the fusion of P2P and CDN is proposed in this paper. It uses P2P network as the backbone, selects nodes of high-performance, high-bandwidth, and stable online time as CDN edge servers, and provides non-P2P users with streaming media services under the schedule of the load-balancing servers. Since P2P has the inherent drawback of flow disorder, an...
The increased deployment of real-time video applications, including IPTV in home networks and remote monitoring in Internet of Things, requires new routing mechanism to support rapid and reliable real-time traffic transmission, especially in the bandwidth-limited and high link loss rate networks. In this paper, we study the problem of reliable multi-path routing with bandwidth and delay constraints...
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