[原创]音箱与扬声器设计的级别正解 - 自由交流室 - 声学楼论坛

Floyd Toole

Floyd E. Toole studied electrical engineering at the University of New Brunswick, and at the Imperial College of Science and Technology, University of London, where he received a Ph.D. In 1965 he joined the National Research Council of Canada, where he reached the position of Senior Research Officer in the Acoustics and Signal Processing Group. In 1991, he joined Harman International Industries, Inc. as Corporate Vice President – Acoustical Engineering. In this position he worked with all Harman International companies, and directed the Harman Research and Development Group, a central resource for technology development and subjective measurements. Early in 2007 Dr. Toole retired.

Dr. Toole’s research has focused on the acoustics and psychoacoustics of sound reproduction in small rooms. Most notably, he established methods for subjective and objective evaluations which have been used to clarify the relationships between technical measurements of audio equipment and listeners’ perceptions. All of this work was directed to improving engineering measurements, objectives for loudspeaker design and production control, and techniques for reducing variability at the loudspeaker / room / listener interface. For papers on these subjects he has received two AES Publications Awards and the AES Silver Medal. A book, “Sound Reproduction”, for Focal Press (2008) is his most recent project. He is a Fellow and Past President of the Audio Engineering Society and a Fellow of the Acoustical Society of America. He is currently active in teaching and course development in CEDIA and in 2008 he was awarded the CEDIA Lifetime Achievement Award.

BEng, PhD (McMaster) - Professor(W)

Room: PHY 354 Ext: 2223 Email: John Vanderkooy

Research Topics: Acoustics, audio and electroacoustics.

Present Research Activities: A study of the linearizing effect of dither in quantized data systems, especially digital audio, has resulted in a number of papers which show that properly dithered systems are totally free of distortion and noise modulation at all signal levels. This work is continuing with a study of noise shaping requantization techniques.

Measurement systems of various types normally work satisfactory when the system under test is truly linear, but nonlinearities can show up surprising differences. Maximum-length sequence (MLS), swept-tone and pulse systems are under study for the characterizations of transducers and acoustic spaces. As well as experiments, computer simulations are used which allow better control of the nonlinearities.

The diffraction of sound by loudspeaker cabinets has been studied with a view to producing simple predictive methods for the effect of a box. A computer algorithm has been applied to solve the Helmholtz sound equation for various shapes, and theoretical analyses show some asymptotic results that are in general agreement with experiment. Currently the diffraction from cabinet edges is under study. The geometrical theory of diffraction is easily modelled on a computer and is efficient enough that second-order diffraction effects can be included. Low-frequency asymptotic results are being used to correct near-field measurements.

Digital Signal Processing is done in our group with an express emphasis on acoustics and audio. Projects include band splitting for multi-way transducers, active noise cancellation, and measurement systems.

J. Vanderkooy and S.P. Lipshitz. 1990. Uses and abuses of the energy-time curve. J. Audio Eng. Soc. 38, 819-836.

S.P. Lipshitz, J. Vanderkooy and R.A. Wannamaker. 1991. Minimally-audible noise shaping. J. Audio Eng. Soc. 39, 836-852. J. Vanderkooy. 1991. A simple theory of cabinet edge diffraction. J. Audio Eng. Soc. 39, 923- 933.

S.P. Lipshitz, R.A. Wannamaker and J. Vanderkooy. 1992. Quantization and Dither: A Theoretical Survey. J. Audio Eng. Soc. 40, 355-375. J. Vanderkooy. 1994. Aspects of MLS Measuring Systems. J. Audio Eng. Soc. 42, 219-231.

John Vanderkooy

Job Title: Professor Emeritus
Company: University of Waterloo

Status: Life Fellow
Member since: 1981
AES Position: Editor
AES Committees: Executive Committee, Board of Governors, Committee Chairs, Nominations, Publications Policy, Associate Technical Editors, Journal Reviewers
Technical Committees: Advisory Group on Regulations, Loudspeakers and Headphones, Signal Processing
Section: Toronto
Alt. Section: British

Audio Fields:

Product Manufacturing - Transducers

Acoustics, Psychoacoustics, Hearing - Measurement and Instrumentation

Product Manufacturing - Research & Development

Educational Institutions - Educator

Job Duties:

Researcher

Acoustic Consultant

Consultant

Educator

About

Member of the Audio Research Group at the University of Waterloo, ON Canada. My research interests are transducers, audio, signal processing and acoustics.

主题：[原创]音箱与扬声器设计的级别正解

Floyd Toole

John Vanderkooy

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