Research Projects

  • 3D Audio Headphones

    Developing a natural sound rendering headphone system with strategic-positioned emitters and advanced 3D audio signal processing techniques. Achieving personalized 3D audio automatically without any measurements or training. Producing important sound cues to recreate a realistic perception of directional sound sources immersed with surround ambience.

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    3D Audio App for Android Devices

    Rich 3D visual content is readily available to the consumer which is largely found in 3D gaming. To create a convincing 3D environment, the gamer should be able to experience to feel a certain level of spaciousness (in a virtual forest) and the 3D sound that are matched with the 3D visual (walking through a virtual forest).

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    Virtual Bass System

    The virtual bass system (VBS) enhances the poor bass performance of the small and flat-panel loudspeakers by tricking the human auditory system to perceive the low-frequency component, that is not physically reproduced. VBS is based on a psychoacoustic phenomenon known as the “missing fundamental”, which states that higher harmonics of the fundamental frequency can produce the sensation of the fundamental frequency in the human brain. The output signal of the VBS consists of the generated higher harmonics and the original signal, so listeners can perceive the enhanced bass performance with loudspeakers having poor bass response.

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    Immersive 3D Audio System for Home Entertainment

    Our expertises in directional audio and audio signal processing have led us to successful research and development of an audio system that is well suited to 3D media. This POC details the implementation of such audio system that is targeted to the desktop PC market. This audio system features a novel integration of the directional loudspeaker with stereo loudspeakers which delivers accurate 3D sound as well as the spaciousness of the audio.

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    Natural Sound Rendering for Headphones

    With the strong growth of assistive and per- sonal listening devices, natural sound ren- dering over headphones is becoming a necessity for prolonged listening in multime-dia and virtual reality applications. The aim of natural sound rendering is to naturally recreate the sound scenes with the spatial and timbral quality as natural as possible, so as to achieve a truly immersive listening experience. However, rendering natural sound over headphones encounters many challenges. This tutorial article presents signal processing techniques to tackle these challenges to assist human listening.

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    Personal Assistive Listening System

    Personal Assistive Listening System is developed using a unique and novel combination of parametric loudspeaker and conventional electro-dynamic loudspeakers developed by the NTU team. By using the combined sound projection of the parametric and conventional loudspeakers, higher sound clarity at predefined frequencies (especially in speech recognition) can be heard by hearing impaired listeners. Personalized Assistive Listening System allows normal hearing listeners and hearing-impaired listeners watching TV together without compromising everyone’s listening experiences.

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    Environmental Noise Source Detection

    Developing an automated traffic noise monitoring and surveillance system to aid government authorities in efficiently enforcing against illegally modified vehicles that produce excess noise on roads.

    Summary

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    Abating Urban Noise Through a Holistic approach of noise monitoring, analytic and control (MAC)

    The main research objective of this project is to combine different enabling technologies developed by ADSC, I2R, and NTU to continuously monitor, analyze, and perform active noise control on aircraft, rail, and road traffic noises affecting the liveable residential environment. With rapid urban development, the annoyance and dissatisfaction caused by excessive urban noise is familiar to almost all Singaporeans; the negative health impact is less well known but is nonetheless very significant.

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    OnTEn: Online Tutor for Engineering Students

    A web-service platform containing student-friendly, easy-to-navigate review modules aiming to assist students in engineering with regular courses being offered by universities.