Muhammad Imran

Techical University Ilmenau

There is a concern about steadily growing annoyance due to noise in private and commercial work offices that leads towards reduced power of concentration during mental work and losses of working performance. This paper describes a method to assess the influence of noise disturbances on human cognitive performance in buildings in compliance with sta...

The auralization of sound insulation between adjoining rooms in virtual reality (VR) environments describes the sound transmission between enclosures, where sound insulation prediction methods are applied for a high-quality auditory stimulus. In this context, a real-time building acoustic auralization framework in 3D audiovisual technology is devel...

Auralization techniques are rapidly attaining importance, mostly due to their applications in building acoustics and virtual reality. As an application, sound insulation auralization has become a valuable tool to assess the sound insulation of buildings in terms of investigating how the indoor and outdoor noise sources are influencing the daily wor...

The present study adopted a human-centred approach to explore the potential of audio-video Virtual Reality (VR) to evaluate indoor noise protection by building characteristics. Different background speech conditions, convolved with sound insulation filters of adjacent office rooms, were presented in a VR office environment and the effects on cognit...

Sound insulation auralization can be used as valuable tool to study the perceptual aspects of sound transmission in built environments for assessment of noise effects on people. It may help to further develop guidelines for building constructions. One advanced goal of real-time sound insulation auralization is to appropriately reproduce the conditi...

This study aims to examine the influence of sound on the perceptions of enclosures in urban street canyons with varying height-to-width ratios (H/Ws). Two typical urban streets, one narrow and one wide, were modelled with street widths of 6 m and 27 m, respectively. The H/W was varied from 0.5 to 6 in seven steps by changing the heights of the buil...

In last decades the introduction of new building technologies and new powerful sound sources in and outside the dwellings, and the increased awareness of noise in the society have all contributed to the development of sound insulation designs. One important part of this development is the technical descriptions and solutions to various problems in...

This study describes the effects of outdoor pass by noise sources, i.e. moving vehicle, on work performance under different sound insulation conditions of virtual built up building structures. The performance of buildings concerning protection against noise exposure is evaluated from technical and human-centred perspectives. The technical-oriented...

Auralization of sound insulation has become a valuable tool to assess the perceptual aspects of sound transmission in built environments. One advanced goal is to appropriately describe the influence of noise disturbance on human cognitive performance in the built environment. Methods for auralization of sound insulation are available with several s...

In buildings, the noise effects on humans include disturbance of conversation or listening to the TV or radio in private dwellings as well as communication in office premises, reduced power of concentration during physical or mental work, and disturbance of sleep. All this strongly depends on the kind of noise signal (speech, music, footfall, etc.)...

In this study we purpose a framework for auralization of airborne sound transmission in complex buildings and develop the corresponding sound insulation filters for the evaluation of performance of building elements in terms of noise and comfort. This paper describes the implementation of airborne sound transmission based on ISO: 12354 Part-1 (2017...

This paper describes the implementation of airborne sound insulation model in buildings based on ISO-EN: 12354 part I (2017). It comprehends the calculation procedures to evaluate the performance of the building elements, from where we can evaluate the overall performance of the buildings in terms of noise and comfort. The basic parameters that are...

3D sound for virtual and augmented reality is proposed by numerous researchers to provide realism in a graphical context. Producing 3D sound poses many challenges, such as personalized head related transfer function for binauralization and the capturing and tracking of users by microphone array or tracking sensors. In this paper, a framework for lo...

Modal synthesis procedures are extensively used in virtual reality applications to estimate the vibrations of rigid bodies and to identify the shapes of modes when subjected to an external force. Modal analysis involves the statistics of material parameters and damping factors. The damping functions are significant in virtual sound generation becau...

Modal synthesis procedures are extensively used in virtual reality applications to estimate the vibrations of rigid bodies and to identify the shapes of modes when subjected to an external force. Modal analysis involves the statistics of material parameters and damping factors. The damping functions are significant in virtual sound generation becau...

In this study we propose a sound rendering framework for telepresence system to achieve an immersive spatial audio for coexistent spaces. We designed sound capturing system, sound rendering methodologies and incorporated the users' movements in real-time from feedback devices (i.e., head tracker, motion detection etc.). Furthermore, the room acoust...

In this study we investigate sound propagation methods in virtual architectural environments for spatialized audio rendering to use in immersive virtual reality (VR) scenarios. During the last few decades, sound propagation models have been designed and investigated for virtual architectural structures, using geometrical approach (GA) and hybrid te...

Acoustic synthesis for frictional sound modelling is a challenging task because of nonlinear coupling in friction phenomenon, in achieving a coherent perceptual audiovisual consistency, especially for games and virtual environments. In this paper we studied and presented an advanced friction model that simultaneously synthesizes both the high-rate...

A methodology is proposed and investigated for realistically synthesizing aerodynamic sounds, such as fire sounds based on a graphically generated animation of fire. The proposed technique, “bandwidth extension method,” is a physically based combustion sound model for synthesizing low frequency flame sounds from a visual flame simulation, which run...

A methodology is proposed and investigated for realistically synthesizing aerodynamic sounds, such as fire sounds based on a graphically generated animation of fire. The proposed technique, “bandwidth extension method,” is a physically based combustion sound model for synthesizing low frequency flame sounds from a visual flame simulation, which run...

A new approach is proposed for investigating the temporal and spatial structures of room impulse responses (IRs) using sound field decomposition. A spherical microphone array was used to analyze the directional characteristics of sound fields through reconstructing the sound fields in an actual chamber hall. To perform directional and spatial chara...

This paper investigates an approach for synthesizing sounds of rigid body interactions using linear modal synthesis (LMS). We propose a technique based on feature extraction from one recorded audio clip to estimate perceptually satisfactory material parameters of virtual objects for real-time sound rendering. In this study, the significant features...

Acoustic source localization and tracking using microphone arrays has become a focus of interest in room acoustics, teleconference systems and tracking of sound producing objects. The current methods to estimate the source localization depend on conventional time-delay estimation techniques between microphone pairs, however, ignoring the ambient no...

Sound field decomposition using spherical microphone arrays has become a focus of interest for spatio-temporal analysis of the sound field in room acoustics, spatial audio rendering applications, and an estimation of the direction and localization of acoustic sources. The existing methods to localize acoustics sources and describe the sound field n...

FEM Solutions for Beam problem including CST, LST, Q4 and Q8 Problem

This study proposes a new technique for investigating the temporal and spatial structures of room impulse responses (IRs) using sound field decomposition and a spherical microphone array at various positions in an actual chamber hall. The spherical microphone array was used to analyze the sound field of the independent directivity through reconstru...

Linear modal synthesis (LMS) has been investigated to synthesize virtual sound of rigid bodies. The existing methods to synthesize realistic sound of virtual objects lack the real-time computations of perceptually satisfactory material parameters. In this study, a novel approach is used for the estimation of the material parameters that record the...

A monitoring and alarming system was designed to detect household noise occurrence in the multistory residential buildings. This system is composed of a microphone combined with a home smart pad installed on a wall and a main server that can store data to discriminate household noise occurrence. Sound levels such as LAeq and L Amax were calculated...

A teleconference system was developed to transmit speech signals for audio communication with remote users. The hardware system was composed of 3-D microphone arrays to capture directional sound and a wireless headset to provide freedom of movement for users. An application programming interface (API) was used for interaction between the computer a...

The modal synthesis method has been investigated to synthesize realistic virtual sounds for rigid bodies. The current methods to create realistic audio quality of sounding materials lack the ability to automatically determine material parameters. In this study, an approach is introduced to estimate material parameters that capture the inherent qual...

The room acoustical characteristics have been investigated in temporal and spatial structures of room impulse responses (IRs) at different audience positions in real halls. The spherical microphone array of 32-channel is used for measurements process. Specular and diffusive reflections in IRs have been visualized in temporal domain with sound-field...

The number of peak (Np) in the impulse response signal (IRs) captured for the real hall have been investigated and measured by using continuous wavelet transform (CWT). Np has a relationship with perceptual diffusion as an objective characteristic that is influenced by walls scattering elements. In addition, as measuring diffuse sound fields, the C...

1 Summary Sound field perception and realization of real spaces in virtual environments using effective binaural technology were investigated. The objective of this study was to design and develop techniques and algorithm that enable us to record perceptual sound fields in reality, reconstruct it, and perform coherent emulation in virtual spaces. T...

Sound field decomposition analysis of room impulse responses (IRs) was performed for temporal and spatial structures at different positions in a real hall using a 32-channel spherical microphone array. Spherical microphone arrays can be used to analyse the sound field independently of the directivity of the acoustic behaviour, and they can be used...

ISO 3382-1 describes instructions for conducting acoustical measurements in auditoria. This standard defines how to measure and derive general properties of the acoustic conditions. By applying the general instructions in ISO, a modified Np was investigated by counting the number of peaks from room impulse responses in an auditorium to characterize...

Specular and diffuse reflections have been detected in fine spatio-temporal structures of room impulse responses (IRs) at different positions in a 1:10 scale model hall. Continuous wavelet transformation (CWT) coefficients were calculated using mother wavelet functions of the Daubechies wavelet families and specular reflections along with their deg...

Specular and diffusive reflections have been investigated in temporal structures of room impulse responses (IRs) at different positions in a 1:10 scale model hall. The wavelet transformation coefficients were calculated for detection of specular and diffusive reflections along with the degree of diffuseness in IRs. From the estimation of arrival di...

Prior to the selection and design of control measures, noise sources must be identified and must be carefully evaluated. To adequately define the noise problem, the following factors should be considered o Type of noise o Noise levels and temporal pattern o Frequency distribution o Noise sources (location, power, and directivity) o Noise propagatio...