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AES New York 2017

143rd International AES Convention

General Information

Exhibtion: October 18th - 20th, 2017
Program: October 18th - 21st, 2017
Venue: Jacob Javits Convention Centre


Come and visit us at booth #445!

To arrange meetings during the fair please contact Jasmin.

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Paper Presentation: Fast Loudspeaker Measurement in Non-Anechoic Environment (Christian Bellmann)

Wednesday, October 18th, 2017 (2pm - 5pm): P04-3 - Transducers Part 1

The evaluation of the loudspeaker performance requires a measurement of the sound pressure output in the far field of the source under free field condition. If the available test room does not fulfil this condition, it is common practice to generate a simulated free field response by separating the direct sound from the room reflection based on windowing and holographic processing. This paper presents a new technique that performs a filtering of the measured sound pressure signal with a complex compensation function prior to other time and frequency analysis. The influence of room, nearfield and positioning error is compensated in the measured fundamental and nonlinear distortion characteristics. Different methods are presented for the generation of the compensation function based on a reference response measured under anechoic conditions and a test response measured under in-situ conditions. Benefits and particularities are demonstrated by practical measurements using different kinds of test signals.

Product Development Track: Is the Anechoic Champer obsolete? (Christian Bellmann)

Saturday, October 21st, 2017 (9am - 10:30am): PD 10

Anechoic rooms have been considered as an expensive but optimum way for assessing loudspeakers under free field conditions. This tutorial discusses the physical limitations of the room and gives practical advice how to avoid systematic measurement errors. In the second part alternative techniques are discussed that allow to provide measurement results under simulated free field conditions. The tutorial also explains common errors generated when a relatively short window is applied to non-anechoic measurement data to extract the direct sound and harmonic distortion (Farina). The tutorial also shows the new opportunities of the holographic measurements based on near field scanning applied to drivers operated in a baffle and complete system. This technique provides highly accurate reference data which can be used for correcting other measurements performed at a single measurement point under non-anechoic conditions by applying inverse filtering of the microphone signal prior to the signal analysis. This tutorial illustrates the conventional and new method on practical examples. 

Product Development Track: New Amplifier Requirements for Speaker Protection and Control (Joachim Schlechter)

Thursday, October 19th, 2017 (10:45am - 12:15pm): PD 04 

Progressing miniaturization and portability introduce new challenges for loudspeaker design. However, demands like higher efficiency and reduced weight can be achieved by combining digital signal processing and optimized transducer design. The tutorial gives an introduction into nonlinear adaptive loudspeaker control and how it can be used to equalize, stabilize, linearize and actively protect transducers. This covers the physical background of nonlinear loudspeaker behavior and the resulting demands on a control algorithm with a strong focus on the practical implementation. The discussion includes resulting requirements for amplifier and transducer design, like power demands and advantages of dc-coupling, as well as techniques to evaluate the system performance.