Accelerating beams have attracted considerable research interest due to their peculiar properties and various applications. Although there have been numerous research on the generation and application of accelerating light beams, few results have been published on the generation of accelerating acoustic beams. Here we report on the experimental observation of accelerating acoustic beams along a...

Large-scale Underwater Wireless Sensor Network (UWSN) is a novel networking paradigm to explore the uninhabited and complex oceans. However, the characteristics of UWSNs, such as huge propagation delay, floating node mobility, and limited acoustic link capacity, are significantly different from ground-based wireless sensor networks and existing small scale Underwater Acoustic Networks (UANs). T...

Acoustic illusion cloaks that create illusion effects by changing the scattered wave have many potential applications in a variety of scenarios. However, the experimental realization of generating three-dimensional (3D) acoustic illusions under detection of broadband signals still remains challenging despite the paramount importance for practical applications. Here we report the design and expe...

The Poseidon project is aimed at bringing multi disciplinary oceanographic data together on an Information Technology backbone in real-time, for improved understanding and forecasting. In this framework zooplankton acoustic backscatter is needed for better biology understanding, and can in turn benefit from the input of physical and biological models. Zooplankton backscatter models are subdivid...

Acoustic emissions are frequently used in material sciences and engineering applications for structural health monitoring. It is known that plants also emit acoustic emissions, and their application in plant sciences is rapidly increasing, especially to investigate drought-induced plant stress. Vulnerability to drought-induced cavitation is a key trait of plant water relations, and contains val...

This paper proposes an acoustic echo cancellation structure for hands-free synthetic surround sound applications, such as multiple participant conferencing, and virtual reality applications. Voice over Internet protocol (VoIP) and other virtual reality applications can benefit from the addition of 3D spatial audio generated by more than two loudspeakers. When full-duplex audio is present in a s...

This article is a review highlighting the application of the acoustic filter as a reliable cell retention device during the long-term perfusion of animal cell cultures. Critical operating parameters such as duty cycle, perfusion and re-circulation flow rates, acoustic power and backflush frequency are discussed with regard to influence on the separation efficiency and optimal operating ranges h...

In this chapter, the applications of high-frequency ultrasound microscopy are reviewed. Several popular types of acoustic microscopy are included, such as scanning acoustic microscopy, ultrasound backscatter microscopy, atomic force acoustic microscopy, and resonance ultrasound microscopy. The working principle and system diagram (both hardware and signal processing) are introduced first. Curre...

In hands-free telephone or video conference application, there exists an acoustic feedback coupling between the loudspeaker and microphone, which creates the acoustic echo. Linear acoustic echo cancellers (AECs) are commonly used to remove this echo. However, they are unable to effectively cancel nonlinear distortions. This paper employs a Hammerstein model to describe the acoustic channel of a...

Traditionally, perceptual judgement of speech disorders by clinicians has been a cornerstone of speech language pathology. Increasingly, it is being argued that acoustic speech analysis should supplement aural perception in the clinic. For successful clinical application of speech technology, experts in acoustic analysis generally agree that a working knowledge of acoustic phonetics, digital si...