... Processing
Volume 2007, Article ID 64921, 16 pages
doi:10.1155/2007/64921
Research Article
Bandwidth Extension of Telephone Speech
Aided by Data Embedding
Ariel Sagi and David Malah
Department of Electrical ... sound of the so-called telephone speech. Listening tests
have shown that the speech bandwidth affects the perceived
speech quality [1]. Artificially ex...
... time slot (T +1)required
to relay all decoded signals of T sources, the bandwidth
efficiency of the proposed schemes is reduced by a factor of
T/(T + 1) as compared to 1/2 for the conventional schemes
in ... by the
following simulation results.
For the purpose of illustration, we investigate the case of
T
= 3. For a fair comparison in terms of bandwidth efficiency,
the direct...
... approximately 56% of total band-
width, while the top 20% of active subscribers consumed
more than 97% of total bandwidth. P2P was by far the largest
consumer of bandwidth with 65.5% of traffic on the ... scale, 46% of P2P trafficwasvideoinMicrosoft
formats. 65% of all audio files by volume of trafficwerestill
traded in the MP3 format, and 12.3% were in the open-
source OGG fil...
... iteration sequence [16]ofaclassofquasi-
contractive operators, called Zamfirescu operators, defined on a closed convex subset C of
aBanachspaceX converges to the fixed point of T. The first author ... generalization of Gregu
ˇ
s fixed point theorem,” Journal of Applied Sciences, vol. 6,
no. 15, pp. 3160–3163, 2006.
[5] C. E. Chidume, “Geometric properties of Banach spaces and nonlinear i...
... University of Lagos, P.O. Box 31, Lagos, Nigeria
Hindawi Publishing Corporation
Fixed Point Theory and Applications
Volume 2007, Article ID 78628, 8 pages
doi:10.1155/2007/78628
Research Article
An Extension ... is a
generalization and an extension of the results of several authors, is proved in this paper.
In addition, we use the Mann iteration to approximate the fixed point...
... inner product and norm. Here, we denote
by ∂
t
u the time derivative of u and by Δu the Laplacian of u with respect to space variable ξ.
Define A : DA ⊂ H → H by
A Δ
2
, with D
A
H
4
Ω
∩ ... supported partially by the NSF of China 10771202, 11071042, the Research Fund
for Shanghai Key Laboratory for Contemporary Applied Mathematics 08DZ2271900 and
the Specializ...
... 2003.
[7] S. Pennock, “Accuracy of the perceptual evaluation of speech
quality (PESQ) algorithm,” in Proceedings of the International
Conference on Measurement of Speech and Audio Quality in
Networks ... focus of more recent quality
measurement research (e.g., see [12, 32]).
6. Conclusions
We have investigated the effects of wireless-VoIP degrada-
tion on the performance of...
... transmission of a
packet and the transmission by the receiving station of its ac-
knowledgment. Transmission of this acknowledgement has
the highest priorit y of any packet (as it is the only means by
which ... is that of nonlinear
optimization of an abstrac ted model of the data exchanges
on the superframe [23]. Nonlinear optimization theory pro-
vides a number of means...
... 2011, Article ID 237219, 14 pages
doi:10.1155/2011/237219
Research Article
Asymptotic Behavior of Solutions of Higher-Order
Dynamic Equations on Time Scales
Taixiang Sun,
1
Hongjian Xi,
2
and Xiaofeng ... G
u
T
t
T
p
τ
Δτ ≤ G
u
T
P.
2.53
The rest of the proof is similar to that of Theorem 2.8, and the details are omitted. The proof
is completed.
Theorem...
... holds.
Acknowledgments
The work was supported by the NSF of China, the Key Project of Chinese Ministry of
Education, the NSF of Jiangxi Province of China, the Youth Foundation of Jiangxi Provincial
Education ... Difference Equations 11
By 13, Theorem 2.3 we have F
1
u ∈ APX. In addition, by a similar proof to that of 2,
Theorem 3.2, one can obtain that F
2
u ∈ PAP...