Untersuchungen zur räumlichen und gehörbezogenen Analyse von Schallfeldern in Sälen

The well directed design of an acoustic sensation has become a fix part in the development of many every day products. Room acoustics deals with the perception of sound fields in enclosures and how they could be influenced. First investigations for a directed layout of those sound fields have been made in the beginning of the last century. First methodically studies on the preferences of listeners have been made at the end of the sixties and beginning of the seventies in terms of factor analysis. Therefor room acoustics was the cutting edge of acoustical design in the seventies. Based on results from literature the current work presents new methods for spatial measurements and evaluations in room acoustics. With the help of those methods sound fields could be analysed on the on hand physically and on the other hand aurally adequate. A new flexible multi-channel measurement system is described, which enables the user to locate the origin of dominant reflections in an enclosure with the help of a multi-channel room impulse measurement. The corresponding time structures can be identified in the room impulse response and their contribution to the sound field can be judged with regard to benefit or damage. In order to measure binaural single number quantities with a microphone array an optimisation algorithm is presented which adapts the directivity pattern and frequency contribution of a microphone array with a set of digital (FIR) filter to the characteristics of a user defined system, e.g. to the transfer functions of dummy heads. The correspondence to artificial head measurements is shown in room acoustics. Measurements from artificial heads or from those microphone arrays are the starting point for an aurally accurate evaluation of the sound fields in enclosures. By convolution of binaural recorded impulse responses with different signals a set of stimuli is created which is analysed aurally adequate by a hearing model. The spectral and temporal performance of different subsystems of the human ear is discussed. The transfer properties of the subsystems are set into relation to physiological results and to the outcome of psycho acoustic experiments. The full hearing model allows the calculation of fundamental perceptual quantities e.g. binaural loudness. The locating possibility of the hearing model is tested in an unechoic surrounding. With the above mentioned and some synthetically created stimuli novel psycho acoustic experiments are performed for the evaluation of auditory source width (ASW) and listener envelopment (LEV). The results of the experiments are compared to the calculations of the hearing model. The dependence of the judgement from the chosen stimulus can be explained and requirements for new measurement systems can be derived.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2004

Author dc:creator

• Becker, Jörg Karl

Contributors dc:contributor

• Lüke, Hans-Dieter

• info:eu-repo/classification/ddc/530
• Saal
• Raumakustik
• Schallmessung
• Physik
• Akustik
• Psychoakustik
• Gehoermodelle
• binaural

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121516%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:59760