This work explores integrating sparse recovery methods into the ray space transform. Sparse recovery methods have proven useful in microphone array analysis of sound fields. In particular, they can provide extremely accurate estimates of source direction in the presences of multiple, simultaneous sources and noise. The ray space transform has recently emerged as a useful tool to analyse sound fields, particulary by robustly integrating information from multiple viewpoints. In this work, we present the results of numerical simulations for a linear microphone array that demonstrate the promising improvements obtained by integrating sparse recovery into the ray space transform.
Veterinary epidemiology is a rapidly developing science. A key factor for success is the ease of data capture. However, real-time data collection is quite hard because in many such systems, users must return to the home or office to import the data to computer or fill a paper-based data entry form. This paper presents an embedded application system for animal disease report and Surveillance system in Veterinary Science which provides real-time Surveillance and allows instant analysis. Using the system, users can access user-friendly software to help diagnose diseases or problems in herds. It designed to deliver benefits to producers, veterinarians, animal health workers, stock agents, government departments and the beef industry.
As a first step in studying the application of the global positioning system (GPS) in a spatial audio communication system, an experimental platform was developed using commercial, off-the-shelf (COTS) GPS units: a Garmin Rino 120 (Rino) and a laptop. Software running on the laptop was developed to create a spatial-audio communication system based on GPS data and the two-way radio link on the Rino units. The audio communications were rendered spatially on headsets and perceptually tested for a number of users. The perceptual results and implementation issues are discussed in this paper. The experimental platform demonstrated that COTS GPS units can be used for a real-time GPS-based spatial audio communication system, but with some limitations.
This paper proposes an improved structural similarity method for audio quality assessment, which is Structural Similarity Analysis of Modulation (SSAM). Different from original structural similarity index measure, we introduce the analysis of structural similarity of modulation together with Computational Auditory Signal-processing and Perception (CASP) model. Audio features from CASP are extended to three dimensions: time, frequency and modulation spectrum. The combined architecture of ITU-R BS.1387-1 and proposed SSAM is given in this paper. Our proposed estimation system not only shows highly correlated with subjective results but also overcomes the shortage of ITU-R BS.1387-1 that only suitable for small impaired audio.
Faller [1] has recently shown that highly directive microphone systems can be obtained using coincident microphones and appropriate signal processing to separate direct and ambient sound. We apply this approach to a Soundfield microphone in which coincident virtual first-order microphone patterns pointing in any direction are available. The variation with our approach is that we apply a specific gain pattern across a set of coincident cardiod or hypercardiod microphones to determine the pick-up direction. A least-squares estimate is made of the spectrum of the on-axis sound. We empirically investigate the performance of this directive microphone technique. [1] C. Faller, "A highly directive 2-capsule based microphone system," in Proc. of 123rd Audio Engineering Convention, New York, U.S.A., October 5-8, 2007.
This paper presents a solution for embedded database application architecture. Many mobile applications contain enormous data and intricate search which are easy to management if those data are preserved into one hard disk or the Disk Array. Therefore, organizing data structure according to device's capacity and system's priority is the way to improve system usability, availability. In order to enable handling enormous information, we propose a database application architecture, which provides reliable and configurable data storage services to embedded application system with the performance, scalability and reliability.
We present an architecture for a bio-inspired circuit that implements a wide-range cross-correlation. The circuit implements a stochastic approximation to mathematical cross-correlation. The basic circuit element is a noise-driven oscillator consisting of an integrator, a Schmitt inverter, and a switch which switches between the two signals to be cross-correlated. These elements can be developed into an NxN array which extends the cross-correlation range and improves the speed and accuracy of the approximation.
While ultrasound is most widely known for its use in diagnostic imaging, the energy carried by ultrasound waves can be utilized to influence cell function and drug delivery. Consequently, our ability to use ultrasound energy at a given intensity unlocks the opportunity to use the ultrasound for therapeutic applications. Indeed, in the last decade ultrasound-based therapies have emerged with promising treatment modalities for several medical conditions. More recently, ultrasound in combination with nanomedicines, i.e. nanoparticles, has been shown to have substantial potential to enhance the efficacy of many treatments including cancer, Alzheimer disease or osteoarthritis. The concept of ultrasound combined with drug delivery is still in its infancy and more research is needed to unfold the mechanisms and interactions of ultrasound with different nanoparticles types and with various cell types. Here we present the state-of-art in ultrasound and ultrasound-assisted drug delivery with a particular focus on cancer treatments. Notably, this review discusses the application of high intensity focus ultrasound for non-invasive tumour ablation and immunomodulatory effects of ultrasound, as well as the efficacy of nanoparticle-enhanced ultrasound therapies for different medical conditions. Furthermore, this review presents safety considerations related to ultrasound technology and gives recommendations in the context of system design and operation.
Spherical microphone arrays provide a powerful tool for examining source localization and direction of arrival (DOA) estimation in the spherical harmonic domain. In previous work, we have investigated applying instantaneous independent component analysis (ICA) or sparse recovery separately in the spherical harmonic domain for DOA estimation. These algorithms work reasonably well, but rely on different signal characteristics: namely statistical independence or the spatial distribution of sources. In this paper, we describe methods to combine the ICA and sparse recovery algorithms to improve DOA estimation. The simulation results indicate that combining ICA and sparse recovery leads to more robust DOA estimation.
In this paper we present a basilar membrane resonator design for an active 2D cochlea. It incorporates some of the non-linear behaviour exhibited in the real cochlea by utilizing a quality factor control loop. This control loop varies the gain and the frequency selectivity of the resonator based on the amplitude of the input signal.
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