Acoustics, Information, and Communication: Memorial Volume by Ning Xiang, Gerhard M. Sessler

By Ning Xiang, Gerhard M. Sessler

This booklet explores the existence and medical legacy of Manfred Schroeder via own reflections, medical essays and Schroeder’s personal memoirs. Reflecting the big variety of Schroeder’s actions, the 1st a part of the ebook comprises 13 articles written by means of his colleagues and previous scholars. issues mentioned comprise his early, pioneering contributions to the knowledge of statistical room acoustics and to the dimension of reverberation time; his advent of electronic sign processing tools into acoustics; his use of ray tracing the right way to examine sound decay in rooms and his achievements in echo and suggestions suppression and in noise aid. different chapters hide his seminal learn in speech processing together with using predictive coding to minimize audio bandwidth which ended in a number of code-excited linear prediction schemes, this day used largely for speech coding. numerous chapters talk about Schroeder’s paintings in low-peak issue indications, quantity concept, and maximum-length sequences with key purposes in listening to examine, diffraction gratings, synthetic reverberators and de-correlation suggestions for reinforcing subjective envelopment in encompass sound. standard, the articles diversity from actually clinical to conversationally own. In all contributions, the connection among the present learn awarded and Manfred Schroeder’s personal fields of curiosity is, often, glaring. the second one a part of the publication contains Schroeder’s personal memoirs, written over the ultimate decade of his existence. those reminiscences make clear many facets not just of Schroeder’s lifestyles but additionally on that of lots of his colleagues, acquaintances 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 type, are jam-packed with details, pleasing and enjoyable to learn, delivering key perception into the existence and paintings of 1 of the best acousticians of the twentieth century.

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J. Audio Eng. Soc. 9(3), 192–197 (1961) 26. : Subjective evaluation of factors affecting 2-channel stereophony. J. Acoust. Soc. Am. 32(11), 1521 (1960) 27. : Apparent sound source translator. US Patent 3,236,949, 1966 28. : Models of hearing. Proc. IEEE 63(9), 1332–1350 (1975) 29. : Comparative study of European concert halls: correlation of subjective preference with geometric and acoustic parameters. J. Acoust. Soc. Am. 56, 1195 (1974) 30. , Cooper, D. : Generalized transaural stereo. In: AES Convention 93 (1992) 31.

The development of a natural sounding reverberation unit without needing to carry out a convolution with a huge number of discrete reflections. Interestingly, Schroeder mentioned that discrete echoes can be handled by discrete delay units but otherwise did not describe the computation of a detailed impulse response or how these discrete echoes should be found. Rather more focus was given to the use of computers for implementing Schroeder’s earlier (1954) seminal work on the statistics of frequency response functions [13].

The so-called cone tracing was presented by Van Maercke et al. in 1986, replacing thin rays (hitting a receiver sphere) by propagating cones (hitting a receiver point) [30]. An important development was presented by Vorla¨nder in 1989 with the so-called hybrid technique: ray tracing was used to find possible reflection paths but in a subsequent phase, the ray-tracing-identified specular reflection paths were replaced by their image source equivalents. An advantage was that the image source method gives exact reflection paths, which can be used for improved accuracy in the early path of the impulse response [31].

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