This book presents the signal processing algorithms that have been developed to process the signals acquired by a spherical microphone array. Spherical microphone arrays can be used to capture the sound field in three dimensions and have received significant interest from researchers and audio engineers. Algorithms for spherical array processing are different to corresponding algorithms already known in the literature of linear and planar arrays because the spherical geometry can be exploited to great beneficial effect. The authors aim to advance the field of spherical array processing by helping those new to the field to study it efficiently and from a single source, as well as by offering a way for more experienced researchers and engineers to consolidate their understanding, adding either or both of breadth and depth. The level of the presentation corresponds to graduate studies at MSc and PhD level. This book begins with a presentation of some of the essential mathematical and physical theory relevant to spherical microphone arrays, and of an acoustic impulse response simulation method, which can be used to comprehensively evaluate spherical array processing algorithms in reverberant environments. The chapter on acoustic parameter estimation describes the way in which useful descriptions of acoustic scenes can be parameterized, and the signal processing algorithms that can be used to estimate the parameter values using spherical microphone arrays. Subsequent chapters exploit these parameters including in particular measures of direction-of-arrival and of diffuseness of a sound field. The array processing algorithms are then classified into two main classes, each described in a separate chapter. These are signal-dependent and signal-independent beamforming algorithms. Although signal-dependent beamforming algorithms are in theory able to provide better performance compared to the signal-independent algorithms, they are currently rarely used in practice. The main reason for this is that the statistical information required by these algorithms is difficult to estimate. In a subsequent chapter it is shown how the estimated acoustic parameters can be used in the design of signal-dependent beamforming algorithms. This final step closes, at least in part, the gap between theory and practice.
A century after his death, Theodore Roosevelt remains one of the most recognizable figures in U.S. history, with depictions of the president ranging from the brave commander of the Rough Riders to a trailblazing progressive politician and early environmentalist to little more than a caricature of grinning teeth hiding behind a mustache and pince-nez. Theodore Roosevelt’s Ghost follows the continuing shifts and changes in this president’s reputation since his unexpected passing in 1919. In the most comprehensive examination of Roosevelt’s legacy, Michael Patrick Cullinane explores the frequent refashioning of this American icon in popular memory. The immediate aftermath of Roosevelt’s death created a groundswell of mourning and goodwill that ensured his place among the great Americans of his generation, a stature bolstered by the charitable and political work of his surviving family. When Franklin Roosevelt ascended to the presidency, he worked to situate himself as the natural heir of Theodore Roosevelt, reshaping his distant cousin’s legacy to reflect New Deal values of progressivism, intervention, and patriotism. Others retroactively adapted Roosevelt’s actions and political record to fit the discourse of social movements from anticommunism to civil rights, with varying degrees of success. Richard Nixon’s frequent invocation led to a decline in Roosevelt’s popularity and a corresponding revival effort by scholars endeavoring to give an accurate, nuanced picture of the 26th president. This wide-ranging study reveals how successive generations shaped the public memory of Roosevelt through their depictions of him in memorials, political invocations, art, architecture, historical scholarship, literature, and popular culture. Cullinane emphasizes the historical contexts of public memory, exploring the means by which different communities worked to construct specific representations of Roosevelt, often adapting his legacy to suit the changing needs of the present. Theodore Roosevelt’s Ghost provides a compelling perspective on the last century of U.S. history as seen through the myriad interpretations of one of its most famous and indefatigable icons.
The ras Superfamily of GTPases presents the most comprehensive compilation of information available regarding aspects of the putative function of small ras-related GTPases. The book's chapters were written by the world's most prominent scientists in this field and cover such topics as the structure and properties of ras proteins, ras function, the ras superfamily in general, and the functional regulation of ras and ras-related GTPases. The book will benefit cell biologists, oncologists, neurobiologists, molecular biologists, and others interested in the topic.
This will help us customize your experience to showcase the most relevant content to your age group
Please select from below
Login
Not registered?
Sign up
Already registered?
Success – Your message will goes here
We'd love to hear from you!
Thank you for visiting our website. Would you like to provide feedback on how we could improve your experience?
This site does not use any third party cookies with one exception — it uses cookies from Google to deliver its services and to analyze traffic.Learn More.