Abstract
This paper describes an advanced calculation scheme based on the loudness level linked to the specific fluctuation strength yielding a weighted normalized loudness level difference as a single number value. This advanced rating method is a useful tool investigating airborne sound insulation. Evidence has been presented that a simple level difference is not a suitable method to exhibit the effects of a given signal to the airborne sound insulation. Additionally, while using a weighted normalized loudness level difference, the effect of different test signals results in a significant influence in the single number value. By analyzing the difference between the standard airborne sound insulation value and the weighted normalized loudness level difference, the sound pressure level that is transmitted through a partition is demonstrated to contain important details concerning the subjective assessment. This study supports findings in the literature that airborne sound insulation performance is significantly dependent on what type of sound signal is used. This paper investigates six different thicknesses of a sand-lime brick using five different sound samples. The study indicates that no single number value can be modeled at this time in relation to a certain construction to fulfill comparable results related to a hearing sensation.
Highlights
Acoustic comfort is assessed in general by subjective evaluation
In that sense, building acoustics is an important factor in building design; in particular, the interior walls, partitions, and floors need to be designed to prevent the intrusion of sound from one room into another
This paper describes the advanced method and discusses the model of a weighted normalized loudness level difference
Summary
Acoustic comfort is assessed in general by subjective evaluation. It describes a condition that expresses satisfaction with the acoustical environment. The basic characteristics of a sound field are known; so far, how people perceive these measures has hardly been taken into considerations It is, important to be aware of the fact that limits given in standards and regulations cannot guarantee that no unwanted sound transmission occur [3]. Neubauer and Kang introduced a concept describing a frequency-dependent weighted normalized loudness level difference [7,8,9]. This concept is intended to be a connection between the objective. The investigation is based on the single number value of the weighted normalized loudness level difference
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