6 research outputs found
The Development of a High Performance Digital RF Transmitter for NMR
This Master鈥檚 thesis consists of the development of a Nuclear Magnetic Resonance (NMR) Radio Frequency (RF) transmitter, which is a core electronic subsystem of an NMR system. The main purpose of this research is to contribute to the application of NMR, which is a new sensing technology that has yet to be fully implemented into the everyday world. One of the barriers to adopting this technology is its complexity. However, the invention of high speed digital FPGAs (Field Programmable Gate Array) such as the Spartan series has made it easier to develop high performance NMR systems over recent years. The major contribution to this research is the development of faster digital signal processing hardware, and methodologies that have been implemented on a single chip. This has reduced the size and the cost of the electronic subsystem and contributed towards the evolution of NMR as a general tool. This thesis introduces the concept of implementing a high-speed NMR RF multi-frequency transmitter by using multiple Direct Digital Synthesis (DDS) cores to generate sine-waves, which range from 100 kHz to 750 MHz. The research required three stages to be achieved, beginning with conceptual design of a high-speed transmitter using MATLAB-Simulink, RTL-level (Register-Transfer Level) simulation and hardware implementation, which included hardware testing on a prototype board. This Master鈥檚 research is to seek a solution to building a multi-core DDS module in an FPGA device. In other words, the research work focuses on finding an alternative solution to constructing a DDS system. The project involves building up the VHSIC Hardware Description Language (VHDL) program to work beyond the hardware limitation of an FPGA device. Hence, the final solution does not consider any noise impact due to the structure of the developed system
Fixed-point analysis and parameter selections of MSR-CORDIC with applications to FFT designs
Mixed-scaling-rotation (MSR) coordinate rotation digital computer (CORDIC) is an attractive approach to synthesizing complex rotators. This paper presents the fixed-point error analysis and parameter selections of MSR-CORDIC with applications to the fast Fourier transform (FFT). First, the fixed-point mean squared error of the MSR-CORDIC is analyzed by considering both the angle approximation error and signal round-off error incurred in the finite precision arithmetic. The signal to quantization noise ratio (SQNR) of the output of the FFT synthesized using MSR-CORDIC is thereafter estimated. Based on these analyses, two different parameter selection algorithms of MSR-CORDIC are proposed for general and dedicated MSR-CORDIC structures. The proposed algorithms minimize the number of adders and word-length when the SQNR of the FFT output is constrained. Design examples show that the FFT designed by the proposed method exhibits a lower hardware complexity than existing methods
Speech Recognition
Chapters in the first part of the book cover all the essential speech processing techniques for building robust, automatic speech recognition systems: the representation for speech signals and the methods for speech-features extraction, acoustic and language modeling, efficient algorithms for searching the hypothesis space, and multimodal approaches to speech recognition. The last part of the book is devoted to other speech processing applications that can use the information from automatic speech recognition for speaker identification and tracking, for prosody modeling in emotion-detection systems and in other speech processing applications that are able to operate in real-world environments, like mobile communication services and smart homes
Anales del XIII Congreso Argentino de Ciencias de la Computaci贸n (CACIC)
Contenido:
Arquitecturas de computadoras
Sistemas embebidos
Arquitecturas orientadas a servicios (SOA)
Redes de comunicaciones
Redes heterog茅neas
Redes de Avanzada
Redes inal谩mbricas
Redes m贸viles
Redes activas
Administraci贸n y monitoreo de redes y servicios
Calidad de Servicio (QoS, SLAs)
Seguridad inform谩tica y autenticaci贸n, privacidad
Infraestructura para firma digital y certificados digitales
An谩lisis y detecci贸n de vulnerabilidades
Sistemas operativos
Sistemas P2P
Middleware
Infraestructura para grid
Servicios de integraci贸n (Web Services o .Net)Red de Universidades con Carreras en Inform谩tica (RedUNCI
Anales del XIII Congreso Argentino de Ciencias de la Computaci贸n (CACIC)
Contenido:
Arquitecturas de computadoras
Sistemas embebidos
Arquitecturas orientadas a servicios (SOA)
Redes de comunicaciones
Redes heterog茅neas
Redes de Avanzada
Redes inal谩mbricas
Redes m贸viles
Redes activas
Administraci贸n y monitoreo de redes y servicios
Calidad de Servicio (QoS, SLAs)
Seguridad inform谩tica y autenticaci贸n, privacidad
Infraestructura para firma digital y certificados digitales
An谩lisis y detecci贸n de vulnerabilidades
Sistemas operativos
Sistemas P2P
Middleware
Infraestructura para grid
Servicios de integraci贸n (Web Services o .Net)Red de Universidades con Carreras en Inform谩tica (RedUNCI