|
Research on fast real-time adaptive audio mixing in multimedia conference
FAN Xing, GU Wei-kang, YE Xiu-qing
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2005, 6( 6): 6-.
https://doi.org/10.1631/jzus.2005.A0507
In multimedia conference, the capability of audio processing is basic and requires more for real-time criteria. In this article, we categorize and analyze the schemes, and provide several multipoint speech audio mixing schemes using weighted algorithm, which meet the demand of practical needs for real-time multipoint speech mixing, for which the ASW and AEW schemes are especially recommended. Applying the adaptive algorithms, the high-performance schemes we provide do not use the saturation operation widely used in multimedia processing. Therefore, no additional noise will be added to the output. The above adaptive algorithms have relatively low computational complexity and good hearing perceptibility. The schemes are designed for parallel processing, and can be easily implemented with hardware, such as DSPs, and widely applied in multimedia conference systems.
|
|
Monotone routing in multirate rearrangeable logd(N,m,p) network
WANG Yang, HWANG Frank K.
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2005, 6( 6): 13-.
https://doi.org/10.1631/jzus.2005.A0555
The construction of multirate rearrangeable network has long been an interesting problem. Of many results published, all were achieved on 3-stage Clos network. The monotone routing algorithm proposed by Hu et al.(2001) was also first applied to 3-stage Clos network. In this work, we adopt this algorithm and apply it to logd(N,m,p) networks. We first analyze the properties of logd(N,m,p) networks. Then we use monotone algorithm in logd(N,0,p) network. Furthermore we extend the result to construct multirate rearrangeable networks based on logd(N,m,p) network (1£m£n-1).
|
|
Semi on-line scheduling for maximizing the minimum machine completion time on three uniform machines
LUO Run-zi, SUN Shi-jie
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2005, 6( 6): 19-.
https://doi.org/10.1631/jzus.2005.A0591
The paper investigates a semi on-line scheduling problem wherein the largest processing time of jobs done by three uniform machines M1, M2, M3 is known in advance. A speed si (s1=1, s2=r, s3=s, 1£r£s) is associated with machine Mi. Our goal is to maximize Cmin-the minimum workload of the three machines. We present a min3 algorithm and prove its competitive ratio is max{r+1,(3s+r+1)/(1+r+s)}, with the lower bound being at least max{2,r}. We also claim the competitive ratio of min3 algorithm cannot be improved and is the best possible for 1£s£2, r=1.
|
19 articles
|