By Ning Xiang, Gerhard M. Sessler
This booklet explores the lifestyles and clinical legacy of Manfred Schroeder via own reflections, clinical essays and Schroeder’s personal memoirs. Reflecting the big variety of Schroeder’s actions, the 1st a part of the ebook includes 13 articles written via his colleagues and previous scholars. subject matters mentioned comprise his early, pioneering contributions to the knowledge of statistical room acoustics and to the dimension of reverberation time; his creation of electronic sign processing tools into acoustics; his use of ray tracing ways to examine sound decay in rooms and his achievements in echo and suggestions suppression and in noise aid. different chapters disguise his seminal study in speech processing together with using predictive coding to lessen audio bandwidth which resulted in a number of code-excited linear prediction schemes, this present day used greatly for speech coding. a number of chapters talk about Schroeder’s paintings in low-peak issue indications, quantity thought, and maximum-length sequences with key purposes in listening to learn, diffraction gratings, synthetic reverberators and de-correlation recommendations for reinforcing subjective envelopment in encompass sound. well-liked, the articles variety from actually clinical to conversationally own. In all contributions, the connection among the present study awarded and Manfred Schroeder’s personal fields of curiosity is, normally, obtrusive. the second one a part of the e-book includes Schroeder’s personal memoirs, written over the ultimate decade of his existence. those memories make clear many points not just of Schroeder’s lifestyles but additionally on that of a lot of his colleagues, neighbors and contemporaries. They painting political, social and clinical occasions over a interval that extends from pre-war to the current. those memoirs, written in an inimitable and witty variety, are jam-packed with info, interesting and enjoyable to learn, supplying key perception into the lifestyles and paintings of 1 of the best acousticians of the 20 th century.
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Extra info for Acoustics, Information, and Communication: Memorial Volume in Honor of Manfred R. Schroeder
For single-slope decays, the corresponding decay time is termed reverberation time, while in multiple-slope decay cases, multiple different decay times are expected. 8 Á tK/Tj) in Eq. 3) is negligible. There are two major issues reported in published literature since 1965; Schroeder integration yields energy decay functions from experimentally measured room impulse responses, which sensitively depend on the upper limit of the integration  and inevitable background noise . The Schroeder decay model in Eq.
The following discussions in the context of modelbased decay analysis, however, remain focused on the Schroeder decay functions. 3 N. Xiang Linear and Nonlinear Regression The characteristic features of Schroeder decay curves summarized above, along with the model in Eq. 3), help us understand the fact that the linear least-squaresfit approach to directly fit logarithmic Schroeder decay functions (curves) relies on an inappropriate model. A large number of investigations have been reported in major acoustics journals for decades after Schroeder published this method.
In underwater acoustics, early work was apparently done using ray tracing in the US Navy. The abstract in a 1956 report by Anderson and Peterson claims that “This report discusses: (1) an acoustic intensity program for estimating convergence zone propagation loss using ray theory” . More publically, in an abstract from an ASA Meeting in November 1961, Norris claimed that “A ray-tracing program which has been developed for the IBM 704 and 7090 computers yields results which show excellent agreement with experimental data.