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Spherical eigenbeamforming microphone arrays have become a subject of interest in recent years [1-6]. General beampattern design and implementation are simplified due to the decomposition of the soundfield into orthonormal spherical harmonic (SH) “building block” eigenbeams. Eigenbeams are then combined to realize the beamformer. In this paper we present a remarkably straightforward and computationally...
In this paper, we propose a formal methodology for tuning the parameters of a single-microphone speech enhancement system for hands-free devices. The tuning problem is formulated as a large-scale nonlinear programming problem that is solved by a genetic algorithm to determine the global solution. A conversational speech database is automatically generated by modeling the interactivity in telephone...
Domestic environments are particularly challenging for distant speech recognition and audio processing in general. Reverberation, background noise and interfering sources, as well as the propagation of acoustic events across adjacent rooms, critically degrade the performance of standard speech processing algorithms. The DIRHA EU project addresses the development of distant-speech interaction with...
This paper presents a localization solution for the study of tagged marine animals (sources) based on direction and Doppler measurements. The source localization, in 3-D, is supported by a Portable Underwater Robotic Tool (PURT), comprising a Ultra-Short Baseline (USBL) aided INS navigation system, carried by a diver (agent). Furthermore, a Surface Robotic Tool (SRT) provides the agent with its absolute...
Ultrasonic ranging device send out ultrasonic pulse for the measurement, the reflected acoustic wave is received by the device and changed into electrical signal by piezoelectric sensor; the distance is calculated according to the time different of sending and receiving. But there is noise in the echo acoustic wave that will affect the quality of the received signal, which will make the reading wrong...
In this paper, an empirical evaluation of acoustical signals for leakage detection and quantification in underground plastic pipes for main water distribution networks is presented. Several experiments have been carried out to collect acoustic signals generated from various leakage volumes. Upon signals analysis, it is noticed that the acquired signals are so weak and they are buried in the background...
The noise of motorcycle has characteristics of broad bandwidth, wide distribution, and large radiation area and so on, the traditional method of noise detection is difficult to identify the noise source accurately. In this paper, the holographic sound intensity has been proposed based on optimize and improve the traditional motorcycle noise sound intensity detection method. The experimental results...
This paper addresses the problem of automatic learning of statistical models of clicks for odontocete species classifications, particularly focusing on improving accuracy of the classifier by iteratively identifying click-like sounds that are likely to be noise and removing these from the model training set. The algorithm is weakly supervised in that no hand-labeled click regions are available, but...
When water flows through the measuring hydrophone and its cable quickly, pressure interference is produced. In this paper, sponge covering the hydrophone is used to isolate the impact of water flowing through the hydrophone and eliminate the burr noise in the signals. Results of the flow tests show that the sponge can effectively filter out the pressure interference caused by water flow, and of little...
In coastal areas, the properties of the soft sediment are crucial for sound propagation prediction and relevant sonar applications. The noise of intense ship traffic is a convenient acoustic source in these areas for geoacoustic characterization. This paper introduces a sequential particle filter (PF) technique that can take advantage of the continuous ship sound field to predict the soft sediment...
Numerical simulations of hydrodynamic noise are made based on the Large Eddy Simulation for both flow-induced noise and noise from the flow-induced vibration of shell and propeller of an underwater vehicle. All hydrodynamic noises are predicted by using Lighthill's acoustic analogy method, and their variation characteristics along the axial and transverse directions, the radiation directivity and...
We propose a method for robustly detecting and extracting repeated signal components within a source signal. The method is based on the recently introduced shift autocorrelation (shift-ACF) which outperforms classical ACF in signal detection if a signal component is repeated more than once. In this paper, we extend shift-ACF to analyze the spectral structure of repeating signal components by using...
The latest important developments in the remotely controlled Active Noise Control (ANC) and Acoustics laboratory at Blekinge Institute of Technology (BTH), Sweden, are introduced. The remotely controlled laboratory is based on the Virtual Instruments Systems in Reality (VISIR) concept, and concerns multi-channel measurement and control of the sound field in a heating ventilation and air conditioning...
The paper illustrates design of a fully differential amplifier to sense current signals generated by CMUT for ultrasound imaging. Detection of reflected ultrasonic waves from body tissues requires low noise amplifier with wide input dynamic range. The transducer, being capacitive, isolates dc voltage from the input of the amplifier necessitating additional biasing circuit. In this work, a differential...
For round square PM motor, the tangential force is the main cause of electromagnetic vibration and noise besides radial force, for its geometry structure and electromagnetic characteristic. This paper deduces the round square motor electromagnetic vibration and acoustic radiation formula, then make radial /tangential force and harmonic analysis, by using Finite Element Method (FEA) analysis, indicating...
Industrial factories involves in their equipment or machinery can be noisy places and exposing employees to conditions can affect their job performance and health quality. Noise exposure in the workplace might have resulted in long-term workers' health problems; occupational diseases. Designers, managers or people responsible for safety of work should take into account possible danger of sound effect...
Logging-while-drilling (LWD) and measurement-while-drilling (MWD) applications have prompted the development of acoustic telemetry for retrieving downhole data. In this paper, a multilevel frequency shift keying (ML-FSK) modulation transceiver with pseudo-coherent differential energy detection is proposed and optimized for such acoustic telemetry applications. The motivation of employing the proposed...
In this paper we are describing useful concept for sound detection and analysis using graphical programming language — LabVIEW. This system is very cost effective and easy to scale up for establishment of correlation with crispiness of food products, breaking strength of solid objects with acoustic parameter. When the material is subjected to the force it will generate a sound before it breaks, so...
This study was conducted to determine the potential of office paper waste and rice husk as acoustic cell material as an absorbent noise. The acoustic cell material combines waste paper and rice husk are given a binder of PVA (polyvinyl acetate). Studies conducted with specimens of making destroy paper then mixed with rice husk. Previous chemically treated rice husks with alkali method governed by...
In this paper, the authors proposed a Hybrid PD (AE) sensor which could tell us an absolute distance from PD source. The proposed sensor installed at one fixed position of power transformer tank wall could detect HF signal and ultrasonic one simultaneously. Ignoring faster arrival time of HF signal, an approximated absolute distance from PD source could be derived easily. Moreover, applying time series...
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