Influences of external error sources on measurements of room acoustic parameters
Martin Guski
Cite this publication as
Martin Guski, Influences of external error sources on measurements of room acoustic parameters (2015), Logos Verlag, Berlin, ISBN: 9783832594367
Descripción / Abstract
Correct and precise measurements of room acoustic parameters are of fundamental importance for subjective room impression characterization and for the physical description of the sound field. This thesis investigates external influences on acoustic measurements and errors of the resulting room acoustic parameters.
Theoretical models have been developed to predict these errors and indicate the tolerable limits of the described influences. To validate these models, specially designed room acoustic measurements that separate the individual influence factors have been conducted.
Noise has been identified as one of the main influence factors and occurs during every measurement. In this thesis the performance of five commonly used stationary noise compensation methods are systematically analyzed depending on the peak signal-to-noise ratio. Impulsive noise that could also occur during the measurement is investigated separately, as the previously introduced compensation techniques are unsuited to handle the influence.
The second part of this thesis analyzes the influence of time variances during measurements. Inter- and intra-measurement temperature changes, air movement, and human-sized scattering objects have been investigated.
Theoretical models have been developed to predict these errors and indicate the tolerable limits of the described influences. To validate these models, specially designed room acoustic measurements that separate the individual influence factors have been conducted.
Noise has been identified as one of the main influence factors and occurs during every measurement. In this thesis the performance of five commonly used stationary noise compensation methods are systematically analyzed depending on the peak signal-to-noise ratio. Impulsive noise that could also occur during the measurement is investigated separately, as the previously introduced compensation techniques are unsuited to handle the influence.
The second part of this thesis analyzes the influence of time variances during measurements. Inter- and intra-measurement temperature changes, air movement, and human-sized scattering objects have been investigated.
Índice
- BEGINN
- 1 Introduction
- 1.1 Objective
- 1.2 Outline
- 2 Fundamentals
- 2.1 Measurement Theory
- 2.2 Acoustic Theory
- 2.3 Room Acoustic Parameters
- 2.4 Assessment of Error Size
- 3 Noise Compensation
- 3.1 Noise Compensation Methods
- 3.2 Evaluation Approaches
- 3.3 Comparison of Noise Compensation Methods
- 3.4 Summary of Noise Compensation Methods
- 3.5 Further Influences
- 3.6 Conclusion
- 4 Impulsive Noise Detection
- 4.1 Theory
- 4.2 Detection of Impulsive Noise
- 4.3 Experimental Validation
- 4.4 Summary and Conclusion of Impulsive Noise
- 5 Time Variances
- 5.1 Air Movement
- 5.2 Inter-Measurement Temperature Changes
- 5.3 Intra-Measurement Temperature Changes
- 5.4 Person Scatter
- 6 Conclusion and Outlook
- A General Assembly Hall
- B Noise Compensation Methods
- B.1 Systematic Error
- B.2 Random Error
- C Inter-Measurement Temperature Change