1,720,953 research outputs found
Digital Signal Processing Implementation Using the TMS320C6000 DSP Platform
No full textDigital signal processing techniques are now so powerful that sometimes it is extremely difficult, if not impossible, for analogue signal processing to achieve the same or closer performance. Added to this, digital signal processors are very affordable and include good development tools and support. This is sufficient to explain the growing number of areas of application for DSP, including motor drives, communications, biomedical instrumentation and automotive applications.Having dealt for some time with undergraduate and postgraduate students, researchers and digital signal processor users in general, I have found that first-time users of DSP find a barrier obstructing them in progressing from theory to the full implementation of algorithms.When it comes to implementing an algorithm many questions arise, questions such as:Which processor to use - fixed or floating point?Which manufacturer to choose?Which application hardware to use?How many I/O interfaces are needed and how fast should they be?When these questions are answered, more questions arise regarding the implementation on the specific processor and hardware selected. In this book, use of the TMS320C6000 will be justified, and the hardware and complete implementation of selected algorithms will be dealt with in detail. Material used for the teaching of undergraduate and postgraduate students, along with laboratory experiments, are used to demonstrate and simplify the transition from theory to the full implementation on the TMS320C6201 processor.This book is divided into nine chapters. Chapters2and 3 are very important and it is advisable that they are well understood before progressing onto subsequent chapters.Chapter 1 IntroductionThis introductory chapter provides the reader with general knowledge on general-purpose DSP processors and also provides an up-to-date TMS320 roadmap showing the evolution of Texas Instruments' DSP chips in terms of processing power.Chapter 2 The TMS320C62xxlC67xx architectureThe objective of this chapter is to provide a comprehensive description of the 'C6x architecture. This includes a detailed description of the Central Processing Unit (CPU) and program control along with an overview of the memory organisation, serial ports, boot function and internal timer.Chapter 3 Software development tools and TMS32OC6201 EVM overviewThis chapter is divided into three main parts. The first part describes the software development tools, the second part describes the Evaluation Module (EVM) and, finally, the third part describes the codec, and use of interrupts along with some useful programs for testing the TMS320C6201 EVM.Chapter 4 Software optimisationTo introduce the need for code optimisation, this chapter starts by developing the concept of pipelining. Since the TMS320C62xx and the TMS320C67xx each have eight units, which are dedicated to different operations, and since different instructions can have different latencies, the programmer or the tools are left with the burden of scheduling the code. Backed by examples, this chapter explains the different techniques used to optimise DSP code on these processors.Chapter 5 Finite Impulse Response (FIR) filter implementationThe purpose of this chapter is twofold. Primarily, it shows how to design an FIR filter and implement it on the TMS320C62xx processor, and secondly, it shows how to optimise the code as discussed in Chapter 4. This chapter discusses the interface between C and assembly, how to use intrinsics, and how to put into practice material that has been covered in the previous chapters.Chapter 6 Infinite Impulse Response (IIR) filter implementationThis chapter introduces the IIR filters and describes two popular design methods, that is the bilinear and the impulse invariant methods. Step by step, this chapter shows the procedures necessary to implement typical IIR filters specified by their transfer functions. Finally, this chapter provides complete implementation of an IIR filter in C language, assembly and linear assembly, and shows how to interface C with linear assembly.Chapter 7 Adaptive filter implementationThis chapter starts by introducing the need for an adaptive filter in communications. It then shows how to calculate the filter coefficients using the Mean Square Error (MSE) criterion, exposes the Least Mean Square (LMS) algorithm and, finally, shows how the LMS algorithm is implemented in both C and assembly.Chapter 8 Goertzel algorithm implementationThis chapter deals with Dual Tone Multi-Frequency (DTMF) detection and provides a practical example of the Goertzel algorithm. This chapter also shows how to produce optimised code by the pen and paper method, describes linear assembly and demonstrates how to program the Direct Memory Access (DMA).Chapter 9 Implementation of the Discrete Cosine TransformThis chapter starts by introducing the need for video compression to reduce the channel bandwidth requirement, then explains the Joint Photographic Experts Group (JPEG) image codec. This includes a detailed discussion and the implementation of the Discrete Cosine Transform (DCT) and Inverse Discrete Cosine Transform (IDCT) and concentrates on their optimisation. An explanation of the PC-DSP communication via the PCI bus is also provided
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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