By Ning Xiang, Gerhard M. Sessler
This e-book explores the lifestyles and medical legacy of Manfred Schroeder via own reflections, medical essays and Schroeder’s personal memoirs. Reflecting the wide variety of Schroeder’s actions, the 1st a part of the ebook comprises 13 articles written via his colleagues and previous scholars. themes mentioned comprise his early, pioneering contributions to the certainty of statistical room acoustics and to the dimension of reverberation time; his advent of electronic sign processing equipment into acoustics; his use of ray tracing easy methods to research sound decay in rooms and his achievements in echo and suggestions suppression and in noise relief. different chapters hide his seminal study in speech processing together with using predictive coding to minimize audio bandwidth which ended in numerous code-excited linear prediction schemes, at the present time used largely for speech coding. numerous chapters speak about Schroeder’s paintings in low-peak issue indications, quantity thought, and maximum-length sequences with key purposes in listening to examine, diffraction gratings, synthetic reverberators and de-correlation concepts for boosting subjective envelopment in encompass sound. common, the articles variety from actually medical to conversationally own. In all contributions, the connection among the present examine offered and Manfred Schroeder’s personal fields of curiosity is, quite often, obtrusive. the second one a part of the ebook includes Schroeder’s personal memoirs, written over the ultimate decade of his existence. those memories make clear many elements not just of Schroeder’s existence but in addition on that of lots of his colleagues, buddies and contemporaries. They painting political, social and medical 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, pleasing and enjoyable to learn, delivering key perception into the existence and paintings of 1 of the best acousticians of the 20 th century.
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Additional info for Acoustics, Information, and Communication: Memorial Volume in Honor of Manfred R. Schroeder
ASA meetings don’t publish any papers, so all that is available is an abstract, plus some example results in two later papers by Schroeder in 1969 and 1970 [4, 24]. It did seem like Atal and Schroeder had a functioning program for general geometries, see Fig. 3 3 In a paper by Wayman and Vanyo in 1977 , the quite straightforward extension of Schroeder’s approach from two to three dimensions was presented, with no reference to the 1968 paper by Krokstad et al. 4 TIME (SECONDS) Fig. 6 Illustration of how the ray-tracing technique was used to gather individual ray-decay curves, which could be averaged to a smooth exponential decay (reproduced from ) The Atal and Schroeder algorithm was presented in the JASA paper in 1970 and their implementation clearly handled various degrees of absorption coefficients, as opposed to the approach by Krokstad et al.
Soc. Am. 41, 1598 (1967) 2. : Calculating the acoustical room response by the use of a ray tracing technique. J. Sound Vib. 8, 118–125 (1968) 3. : Digital computers in room acoustics. In Proceedings of the 4th International Congress on Acoustics, Copenhagen (1962) 4. : Digital simulation of sound transmission in reverberant spaces. J. Acoust. Soc. Am. 47, 424–431 (1970) 5. CATT Acoustic. se 6. Odeon. dk 7. : The history of linear prediction. IEEE Signal Processing Magazine, Match 2006, pp. 154–161 (2006) 8.
Another paper, published in 1977, that also seemed to be unaware of the Krokstad paper, has been mentioned above . On the other hand, citations of the Krokstad paper appeared in 1971 , 1973 , and later. Krokstad et al. summarized the work in Trondheim in the paper titled “Fifteen years’ experience with computerized ray tracing” . Of special relevance is the paper by Kuttruff in 1971 . That paper presented an integral equation formulation (later, independent versions of this became 26 A.
Acoustics, Information, and Communication: Memorial Volume in Honor of Manfred R. Schroeder by Ning Xiang, Gerhard M. Sessler