-
The 4.0 kbit/s speech codec described in this paper is based on a
Frequency Domain Interpolative (FDI) coding technique, which
belongs to the class of prototype waveform Interpolation (PWI)
coding techniques. The codec also has an integrated voice
activity detector (VAD) and a noise reduction capability. The
input signal is subjected to LPC analysis and the prediction
residual is separated into a slowly evolving waveform (SEW) and
a rapidly evolving waveform (REW) components. The SEW
magnitude component is quantized using a hierarchical
predictive vector quantization approach. The REW magnitude is
quantized using a gain and a sub-band based shape. SEW and
REW phases are derived at the decoder using a phase model,
based on a transmitted measure of voice periodicity. The spectral
(LSP) parameters are quantized using a combination of scalar
and vector quantizers. The 4.0 kbits/s coder has an algorithmic
delay of 60 ms and an estimated floating point complexity of
21.5 MIPS. The performance of this coder has been evaluated
using in-house MOS tests under various conditions such as
background noise. channel errors, self-tandem. and DTX mode
of operation, and has been shown to be statistically equivalent to
ITU-T (3.729 8 kbps codec across all conditions tested.
標(biāo)簽：
frequency-domain
interpolation
performance
Design
kbit_s
speech
coder
based
and
of
上傳時間：
2018-04-08
上傳用戶：kilohorse
-
The BTS5016SDA is a one channel high-side power switch in PG-TO252-5-11 package providing embedded
protective functions.
The power transistor is built by a N-channel vertical power MOSFET with charge pump. The design is based on
Smart SIPMOS chip on chip technology.
The BTS5016SDA has a current controlled input and offers a diagnostic feedback with load current sense and a
defined fault signal in case of overload operation, overtemperature shutdown and/or short circuit shutdown.
標(biāo)簽：
datasheet
BTS
50
上傳時間：
2019-03-27
上傳用戶：guaixiaolong
-
The contemporary view of the Smart City is very much static and infrastructure-
centric, focusing on installation and subsequent management of Edge devices and
analytics of data provided by these devices. While this still allows a more efficient
management of the city’s infrastructure, optimizations and savings in different do-
mains, the existing architectures are currently designed as single-purpose, vertically
siloed solutions. This hinders active involvement of a variety of stakeholders (e.g.,
citizens and businesses) who naturally form part of the city’s ecosystem and have an
inherent interest in jointly coordinating and influencing city-level activities.
標(biāo)簽：
Internet
Systems
Cities
People
Things
Smart
The
and
of
上傳時間：
2020-05-26
上傳用戶：shancjb
-
Today’s wireless services have come a long way since the roll out of the
conventional voice-centric cellular systems. The demand for wireless access
in voice and high rate data multi-media applications has been increasing.
New generation wireless communication systems are aimed at accommodating
this demand through better resource management and improved transmission
technologies.
標(biāo)簽：
Radio
Cognitive
Software
Defined
上傳時間：
2020-05-26
上傳用戶：shancjb
-
The first Third Generation Partnership Project (3GPP) Wideband Code Division
Multiple Access (WCDMA) networks were launched during 2002. By the end of 2005
there were 100 open WCDMA networks and a total of over 150 operators having
frequency licenses for WCDMA operation. Currently, the WCDMA networks are
deployedinUniversalMobileTelecommunicationsSystem(UMTS)bandaround2GHz
in Europe and Asia including Japan and Korea. WCDMA in America is deployed in the
existing 850 and 1900 spectrum allocations while the new 3G band at 1700/2100 is
expected to be available in the near future. 3GPP has defined the WCDMA operation
also for several additional bands, which are expected to be taken into use during the
coming years.
標(biāo)簽：
HSDPAHSUPA
Access
Speed
Radio
UMTS
High
for
上傳時間：
2020-05-27
上傳用戶：shancjb
-
This book addresses two aspects of network operation quality; namely, resource
management and fault management.
Network operation quality is among the functions to be fulfilled in order to offer
quality of service, QoS, to the end user. It is characterized by four parameters:
– packet loss;
– delay;
– jitter, or the variation of delay over time;
– availability.
Resource management employs mechanisms that enable the first three parameters
to be guaranteed or optimized. Fault management aims to ensure continuity of service.
標(biāo)簽：
Ethernet
Networks
MPLS
and
IP
上傳時間：
2020-05-27
上傳用戶：shancjb
-
For nearly a hundred years telecommunications provided mainly voice services and very low speed
data (telegraph and telex). With the advent of the Internet, several data services became mainstream
in telecommunications; to the point that voice is becoming an accessory to IP-centric data networks.
Today, high-speed data services are already part of our daily lives at work and at home (web surfing,
e-mail, virtual private networks, VoIP, virtual meetings, chats...). The demand for high-speed data
services will grow even more with the increasing number of people telecommuting.
標(biāo)簽：
WiMAX
WLAN
LTE
and
上傳時間：
2020-05-27
上傳用戶：shancjb
-
In the nineteenth century, scientists, mathematician, engineers and innovators started
investigating electromagnetism. The theory that underpins wireless communications was
formed by Maxwell. Early demonstrations took place by Hertz, Tesla and others. Marconi
demonstrated the first wireless transmission. Since then, the range of applications has
expanded at an immense rate, together with the underpinning technology. The rate of
development has been incredible and today the level of technical and commercial maturity
is very high. This success would not have been possible without understanding radio-
wave propagation. This knowledge enables us to design successful systems and networks,
together with waveforms, antennal and transceiver architectures. The radio channel is the
cornerstone to the operation of any wireless system.
標(biāo)簽：
LTE-Advanced
Generation
Next
and
上傳時間：
2020-05-27
上傳用戶：shancjb
-
Quality of Service ( QoS ) has always been in a world of its own, but as the technology
has been refi ned and has evolved in recent years, QOS usage has increased to the point
where it is now considered a necessary part of network design and operation. As with
most technologies, large - scale deployments have led to the technology becoming more
mature, and QOS is no exception.
標(biāo)簽：
QOS-Enabled
Networks
上傳時間：
2020-05-31
上傳用戶：shancjb
-
The following sections profile many of the vendors in the NFV market. The individual profiles were created
through a collaborative effort between SDNCentral’s Research Team and the Vendor’s product experts.
SDNCentral worked under the assumption the information provided by the vendors was factual, auditing the
submissions only to remove unverifiable claims and hyperbole. Extended profiles can be viewed online.
While every attempt has been made to validate the capabilities listed in the profiles, SDNCentral advises end
users to verify the veracity of each claim for themselves in their actual deployment environments. SDNCentral
cannot be held liable for unexpected operations, damages or incorrect operation due to any inaccuracies listed
here. SDNCentral welcomes feedback and additional information from end users based on their real-world
experiences with the products and technologies listed. The SDNCentral research team can be reached at
標(biāo)簽：
SDxCentral-Mega-NFV-Report
上傳時間：
2020-06-01
上傳用戶：shancjb
