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Audio Engineering Society
Convention Paper
Presented at the 116th Convention
2004 May 8–11 Berlin, Germany
Merging Room-acoustic and Electro-acoustic Measurement Methods
Wolfgang Ahnert, Stefan Feistel, and Waldemar Richert Software Design Ahnert GmbH, Berlin, 13189, Germany
ABSTRACT
Today various acoustic measurement methods are used to investigate rooms or devices under test. For room-acoustic measurements MLS routines are often applied to obtain the detailed data according to ISO standard 3382. Instead of MLS, nowadays the dual-channel FFT method based on a sweep stimulus is commonly accepted, too. On the other hand, excitation by continuous noise or shot noise is used to obtain a good overview in a short time. For loudspeaker data acquisition or commissioning tests in noisy environments a TDS sweep measurement is performed to achieve results of high accuracy. Here a new measurement tool will be presented, incorporating all of these widely known methods. The advantages and disadvantages as well as the limitations will be discussed for each technique by means of specific examples and measuring applications. A detailed comparison will be provided and recommendations for the practical use under selected acoustic environmental conditions will be given.
Audio Engineering Society
Convention Paper
Presented at the 110th AES Convention
2001, May 12-15, Amsterdam, Preprint No. 5352
"Merging software for sound reinforcement systems and
for room acoustics"
O. Schmitz, S. Feistel*, W. Ahnert*, M. Vorländer Institut für Technische Akustik, RWTH Aachen, Germany
* ADA Acoustic Design Ahnert, Berlin, Germany
Abstract
The combination of a well-known electro acoustical simulation software with a state-of-the-art room acoustical simulation engine merging the advantages of both to form a multi-purpose simulation tool, is introduced. The new tool is useful for consultants for application in complex situations in medium sized and large rooms. Advantages of
combining a high quality speaker database and a powerful 3D-CAD interface with a hybrid image source / ray tracing algorithm including diffuse scattering will be discussed. Details about the room acoustical model and its limitations as well as the extended possibilities of the system are the main topics of this paper.
Audio Engineering Society
Convention Paper
Presented at the 115th Convention
2003 October 10–13 New York, New York
Time Delay Spectrometry Processing using Standard Hardware Platforms
Wolfgang Ahnert [1], Stefan Feistel [2], Steven McManus [3] and Waldemar Richert [2]
[1] ADA Acoustic Design Ahnert, Berlin, 13189, Germany
[2] SDA Software Design Ahnert GmbH, Berlin, 13189, Germany
[3] Gold Line Connector Inc., New Bedford, MA, 02745, USA
ABSTRACT
The processing power today available on portable computer platforms is now so far advanced that it is no longer necessary to use dedicated digital signal processing platforms for the intensive analysis required in Time Delay Spectrometry. Moving the processing from a dedicated platform onto a standard personal computer becomes possible with the TDS technology realized in a measurement and post-processing software instead. It also opens the way for more information to be extracted from a measurement after it had been made. Care must still be taken in the choice of the data gathering system, as timing between input and output data samples is critical.
Aspects of a modern stadium sound reinforcement
Wolfgang Ahnert, ADA Acoustic Design Ahnert, Berlin
Proceedings of the Institute of Acoustics
COMPARISON OF ACTUAL TEF MEASUREMENT METHODS WITH A NEW SOFTWARE BASED APPROACH
Wolfgang Ahnert, Stefan Feistel & Waldemar Richert, SDA Software Design Ahnert GmbH Steven McManus, Gold Line
Audio Engineering Society
Conference Paper
Presented at the 21st International Conference
2002 June 1–3 St. Petersburg, Russia
Implementation of intelligibility algorithms into EASE 4.0
Wolfgang Ahnert [1], Stefan Feistel [1] and Oliver Schmitz [1]
[1] ADA Acoustic Design Ahnert, Berlin 13355, Germany
ABSTRACT
In acoustic simulation programs very different algorithms are used to calculate the intelligibility of speech and music. The desired results are obtained by postprocessing fixed energy ratios as well as time-depending impulse responses. In EASE 4.0 there are have been implemented now all usual intelligibility measures, derived by means of simulated high resolution data or by applying statistical estimations. This paper compares all these measures and methods like STI, AlCons, definition etc. by means of the results obtained within a common computer model. Recommendations for applications will be given finally.
Audio Engineering Society
Conference Paper
Presented at the 21st International Conference
2002 June 1–3 St. Petersburg, Russia
Acoustic Design of the Great Philharmonic Hall in the Moscow International
Music Dome (MIMD)
Wolfgang Ahnert [1], Lev A. Borisov [2], Christofor A. Shirjetski [2]
[1] ADA Acoustic Design Ahnert, Berlin, Germany
[2] Research Institute of Building Physics, Moscow, Russia
ABSTRACT
In Moscow, the construction of an International Music Dome incorporating three halls is nearing completion. The Great Philharmonic Hall of the Dome seats 1800 listeners and excels by originality and outstanding architectural design. It is mainly meant for the performance of classical symphonic concerts without electronic support of the performers. The special feature of the hall is that it can be used for three different concert forms requiring different performance qualities: organ concerts, symphonic concerts, chamber concerts. Each of these three concert forms calls for specific room-acoustical conditions. Computer simulation and Physical model measurements have helped to optimize these corresponding optimal acoustic conditions.
Phase presentation in the acoustic design program EASE
By Wolfgang Ahnert, Cedric Bourillet and Stefan Feistel
Stadium Sound Reinforcement:
Immission Protection in Spite of High Useful Levels
Dr. Wolfgang Ahnert [1], Dr. Benjamin Jäger [2]
[1] ADA Acoustic Design Ahnert, Berlin, Germany, Email: wahnert@ada-acousticdesign.de
[2] BeSB GmbH Berlin, Schalltechnisches Büro, Berlin, Germany, Email: b.jaeger@besb.de
ABSTRACT
This contribution explains how acoustical quality criteria for a stationary stadium sound reinforcement system were elaborated with particular regard to minimizing immission to
neighboring areas, and how forthcoming concepts from bidding firms were evaluated. Thanks to the inclusion of the results obtained by soundreinforcement computer simulation (EASE) in the calculated immission prediction it was possible to assess various soundreinforcement concepts with regard to the sound quality to be expected within the stadium, but also in respect of immission avoidance.
