-
This paper presents a Hidden Markov Model (HMM)-based speech
enhancement method, aiming at reducing non-stationary noise from speech
signals. The system is based on the assumption that the speech and the noise
are additive and uncorrelated. Cepstral features are used to extract statistical
information from both the speech and the noise. A-priori statistical
information is collected from long training sequences into ergodic hidden
Markov models. Given the ergodic models for the speech and the noise, a
compensated speech-noise model is created by means of parallel model
combination, using a log-normal approximation. During the compensation, the
mean of every mixture in the speech and noise model is stored. The stored
means are then used in the enhancement process to create the most likely
speech and noise power spectral distributions using the forward algorithm
combined with mixture probability. The distributions are used to generate a
Wiener filter for every observation. The paper includes a performance
evaluation of the speech enhancer for stationary as well as non-stationary
noise environment.
標簽：
Telecommunications
Processing
Signal
for
上傳時間：
2020-06-01
上傳用戶：shancjb
-
In this thesis several asp ects of space-time pro cessing and equalization for wire-
less communications are treated. We discuss several di?erent metho ds of improv-
ing estimates of space-time channels, such as temp oral parametrization, spatial
parametrization, reduced rank channel estimation, b o otstrap channel estimation,
and joint estimation of an FIR channel and an AR noise mo del. In wireless commu-
nication the signal is often sub ject to intersymb ol interference as well as interfer-
ence from other users.
標簽：
Communications
Space-Time
Processing
Wireless
for
上傳時間：
2020-06-01
上傳用戶：shancjb
-
Part I provides a compact survey on classical stochastic geometry models. The basic models defined
in this part will be used and extended throughout the whole monograph, and in particular to SINR based
models. Note however that these classical stochastic models can be used in a variety of contexts which
go far beyond the modeling of wireless networks. Chapter 1 reviews the definition and basic properties of
Poisson point processes in Euclidean space. We review key operations on Poisson point processes (thinning,
superposition, displacement) as well as key formulas like Campbell’s formula. Chapter 2 is focused on
properties of the spatial shot-noise process: its continuity properties, its Laplace transform, its moments
etc. Both additive and max shot-noise processes are studied. Chapter 3 bears on coverage processes,
and in particular on the Boolean model. Its basic coverage characteristics are reviewed. We also give a
brief account of its percolation properties. Chapter 4 studies random tessellations; the main focus is on
Poisson–Voronoi tessellations and cells. We also discuss various random objects associated with bivariate
point processes such as the set of points of the first point process that fall in a Voronoi cell w.r.t. the second
point process.
標簽：
Stochastic
Geometry
Networks
Wireless
Volume
and
上傳時間：
2020-06-01
上傳用戶：shancjb
-
Each of us is interested in optimization, and telecommunications. Via several meetings,
conferences, chats, and other opportunities, we have discovered these joint interests and
decided to put together this book.
標簽：
Telecommunications
optimization
heuristics
上傳時間：
2020-06-01
上傳用戶：shancjb
-
Electrostatic discharge (ESD) is one of the most prevalent threats to the reliability
of electronic components. It is an event in which a finite amount of charge is trans-
ferred from one object (i.e., human body) to another (i.e., microchip). This process
can result in a very high current passing through the microchip within a very short
period of time, and, hence, more than 35% of chip damages can be attributed to an
ESD-related event. As such, designing on-chip ESD structures to protect integrated
circuits against the ESD stresses is a high priority in the semiconductor industry.
標簽：
Electrostatic
Protection
Discharge
上傳時間：
2020-06-05
上傳用戶：shancjb
-
Failure analysis is invaluable in the learning process of electrostatic discharge (ESD) and
electrical overstress (EOS) protection design and development [1–8]. In the failure analysis
of EOS, ESD, and latchup events, there are a number of unique failure analysis processes
andinformationthatcanprovidesignificantunderstandingandillumination[4].Today,thereis
still no design methodology or computer-aided design (CAD) tool which will predict EOS,
ESDprotectionlevels,andlatchupinasemiconductorchip;thisisoneofthesignificantreasons
why failure analysis is critical to the ESD design discipline.
標簽：
Mechanisms
Failure
Models
ESD
and
上傳時間：
2020-06-05
上傳用戶：shancjb
-
The planarization technology of Chemical-Mechanical-Polishing (CMP), used for the manufacturing of multi-
level metal interconnects for high-density Integrated Circuits (IC), is also readily adaptable as an enabling technology
in MicroElectroMechanical Systems (MEMS) fabrication, particularly polysilicon surface micromachining. CMP not
only eases the design and manufacturability of MEMS devices by eliminating several photolithographic and film
issues generated by severe topography, but also enables far greater flexibility with process complexity and associated
designs. T
標簽：
mechanical
polishing
Chemical
上傳時間：
2020-06-06
上傳用戶：shancjb
-
In this research, we have designed, developed implemented a wireless sensor
networks based smart home for safe, sound and secured living environment for
any inhabitant especially elderly living alone. We have explored a methodology
for the development of efficient electronic real time data processing system to
recognize the behaviour of an elderly person. The ability to determine the
wellness of an elderly person living alone in their own home using a robust,
flexible and data driven artificially intelligent system has been investigated. A
framework integrating temporal and spatial contextual information for
determining the wellness of an elderly person has been modelled. A novel
behaviour detection process based on the observed sensor data in performing
essential daily activities has been designed and developed.
標簽：
Smart
Homes
上傳時間：
2020-06-06
上傳用戶：shancjb
-
The continuous progress in modern power device technology is increasingly
supported by power-specific modeling methodologies and dedicated simulation
tools. These enable the detailed analysis of operational principles on the the device
and on the system level; in particular, they allow the designer to perform trade-
off studies by investigating the operation of competing design variants in a very
early stage of the development process. Furthermore, using predictive computer
simulation makes it possible to analyze the device and system behavior not only
under regularoperatingconditions, but also at the rim of the safe-operatingarea and
beyond of it, where destructive processes occur that limit the lifetime of a power
system.
標簽：
POWERHVMOS_Devices_Compact_Modeli
ng
上傳時間：
2020-06-07
上傳用戶：shancjb
-
It was the publisher’s idea that I write
RFID in the Supply Chain: A Guide
to Selection and Implementation
. Not only am I editor of
Enterprise Inte-
gration System
,
Second Edition Handbook
and author of
The
Complete Book
of Middleware
, I also had some innovative business process and project
management ideas on improving the effectiveness of integrating enterprise
systems with information on product traceability, the scope of which has
been widened by the RFID technology mandates.
標簽：
Selection
Supply
Chain
Guide
RFID
the
in
to
上傳時間：
2020-06-08
上傳用戶：shancjb
