scholarly journals Real-Time Audio Retrieval Method and Automatic Commercial Detecting System

2006 ◽  
Vol 2 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Guibin Zheng ◽  
Jiqing Han
Keyword(s):  
Real Time ◽  
Retrieval Method ◽  
Audio Retrieval

An Inverted Index Based Audio Retrieval Method

2013 ◽  
Vol 34 (11) ◽  
pp. 2561-2567 ◽  
Author(s):  
Xue-yuan Zhang ◽  
Qian-hua He ◽  
Yan-xiong Li ◽  
Wan-ling Ye
Keyword(s):  
Inverted Index ◽  
Retrieval Method ◽  
Audio Retrieval

scholarly journals Robust audio retrieval method based on anti‐noise fingerprinting and segmental matching

2020 ◽  
Vol 56 (5) ◽  
pp. 245-247 ◽  
Author(s):  
Xueshuai Zhang ◽  
Ge Zhan ◽  
Wenchao Wang ◽  
Pengyuan Zhang ◽  
Yonghong Yan
Keyword(s):  
Retrieval Method ◽  
Audio Retrieval

An Eigen-based motion retrieval method for real-time animation

2014 ◽  
Vol 38 ◽  
pp. 255-267 ◽  
Author(s):  
Pengjie Wang ◽  
Rynson W.H. Lau ◽  
Zhigeng Pan ◽  
Jiang Wang ◽  
Haiyu Song
Keyword(s):  
Real Time ◽  
Retrieval Method ◽  
Motion Retrieval

A New Method for Real-Time Monitoring of Grout Spread Through Fractured Rocks

2008 ◽  
Vol 1107 ◽  
Author(s):  
Alasdair E. Henderson ◽  
Iain A. Robertson ◽  
John M Whitfield ◽  
Graham F.G. Garrard ◽  
Nicholas G. Swannell ◽  
...  
Keyword(s):  
Rock Mass ◽  
Real Time ◽  
Fractured Rock ◽  
Field Trials ◽  
New Method ◽  
Real Time Monitoring ◽  
Retrieval Method ◽  
Extensive Field ◽  
Grout Spread ◽  
Rock Mass Permeability

AbstractReducing water ingress into the Shaft at Dounreay is essential for the success of future intermediate level waste (ILW) recovery using the dry retrieval method. The reduction is being realised by forming an engineered barrier of ultrafine cementitious grout injected into the fractured rock surrounding the Shaft. Grout penetration of 6m in <50μm fractures is being reliably achieved, with a pattern of repeated injections ultimately reducing rock mass permeability by up to three orders of magnitude.An extensive field trials period, involving over 200 grout mix designs and the construction of a full scale demonstration barrier, has yielded several new field techniques that improve the quality and reliability of cementitious grout injection for engineered barriers.In particular, a new method has been developed for tracking in real-time the spread of ultrafine cementitious grout through fractured rock and relating the injection characteristics to barrier design. Fieldwork by the multi-disciplinary international team included developing the injection and real-time monitoring techniques, pre- and post injection hydro-geological testing to quantify the magnitude and extent of changes in rock mass permeability, and correlation of grout spread with injection parameters to inform the main works grouting programme.

scholarly journals Satellite Retrieval of Downwelling Shortwave Surface Flux and Diffuse Fraction under All Sky Conditions in the Framework of the LSA SAF Program (Part 1: Methodology)

2019 ◽  
Author(s):  
Dominique Carrer ◽  
Xavier Ceamanos ◽  
Suman Moparthy ◽  
Chloe Vincent ◽  
Sandra C. Freitas ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Real Time ◽  
Numerical Models ◽  
Temporal Frequency ◽  
Accurate Information ◽  
Simultaneous Estimation ◽  
Retrieval Method ◽  
Diffuse Fraction ◽  
Satellite Retrieval ◽  
Incoming Solar Radiation

Several studies have shown that changes in incoming solar radiation and variations of the diffuse fraction can significantly modify the vegetation carbon uptake. Hence, monitoring the incoming solar radiation at large scale and with high temporal frequency is crucial for this reason along with many others. The EUMETSAT Satellite Application Facility for Land Surface Analysis (LSA SAF) operationally disseminates in near real time estimates of the downwelling shortwave radiation at the surface since 2005. This product is derived from observations provided by the SEVIRI instrument onboard the Meteosat Second Generation series of geostationary satellites, which covers Europe, Africa, the Middle East, and part of South America. However, near real time generation of the diffuse fraction at the surface level has only recently been initiated. The main difficulty towards achieving this goal was the general lack of accurate information on the aerosol particles in the atmosphere. This limitation is nowadays less important thanks to the improvements in atmospheric numerical models. This study presents an upgrade of the LSA-SAF operational retrieval method, which provides the simultaneous estimation of the incoming solar radiation and its diffuse fraction from satellite every 15 minutes. The upgrade includes a comprehensive representation of the influence of aerosols based on physical approximations of the radiative transfer within an atmosphere-surface associated medium. This article explains the retrieval method, discusses its limitations and differences with the previous method, and details the characteristics of the output products. A companion article will focus on the evaluation of the products against independent measurements of solar radiation. Finally, the access to the source code is provided through an open access platform in order to share with the community the expertise on the satellite retrieval of this variable.

scholarly journals Audio Fingerprint Extraction Based on Locally Linear Embedding for Audio Retrieval System

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1483
Author(s):  
Maoshen Jia ◽  
Tianhao Li ◽  
Jing Wang
Keyword(s):  
Locally Linear Embedding ◽  
Time Warping ◽  
Retrieval Method ◽  
Audio Fingerprinting ◽  
Audio Retrieval ◽  
Audio Data ◽  
Linear Embedding ◽  
Matching Strategy ◽  
Dynamic Time ◽  
Locally Linear

With the appearance of a large amount of audio data, people have a higher demand for audio retrieval, which can quickly and accurately find the required information. Audio fingerprint retrieval is a popular choice because of its excellent performance. However, there is a problem about the large amount of audio fingerprint data in the existing audio fingerprint retrieval method which takes up more storage space and affects the retrieval speed. Aiming at the problem, this paper presents a novel audio fingerprinting method based on locally linear embedding (LLE) that has smaller fingerprints and the retrieval is more efficient. The proposed audio fingerprint extraction divides the bands around each peak in the frequency domain into four groups of sub-regions and the energy of every sub-region is computed. Then the LLE is performed for each group, respectively, and the audio fingerprint is encoded by comparing adjacent energies. To solve the distortion of linear speed changes, a matching strategy based on dynamic time warping (DTW) is adopted in the retrieval part which can compare two audio segments with different lengths. To evaluate the retrieval performance of the proposed method, the experiments are carried out under different conditions of single and multiple groups’ dimensionality reduction. Both of them can achieve a high recall and precision rate and has a better retrieval efficiency with less data compared with some state-of-the-art methods.

scholarly journals Probabilistic retrieval of volcanic SO<sub>2</sub> layer height and partial column density using the Cross-track Infrared Sounder (CrIS)

2020 ◽  
Vol 13 (11) ◽  
pp. 5891-5921
Author(s):  
David M. Hyman ◽  
Michael J. Pavolonis
Keyword(s):  
Real Time ◽  
Column Density ◽  
Probabilistic Approach ◽  
Volcanic Eruptions ◽  
Volcanic Plume ◽  
Retrieval Method ◽  
Layer Height ◽  
Wide Range ◽  
The Cross ◽  
Cross Track

Abstract. During most volcanic eruptions and many periods of volcanic unrest, detectable quantities of sulfur dioxide (SO2) are injected into the atmosphere at a wide range of altitudes, from ground level to the lower stratosphere. Because the fine ash fraction of a volcanic plume is, at times, colocated with SO2 emissions, global tracking of volcanic SO2 is useful in tracking the hazard long after ash detection becomes dominated by noise. Typically, retrievals of SO2 vertical column density (VCD) have relied heavily on hyperspectral ultraviolet measurements. More recently, infrared sounders have provided additional VCD measurements and estimates of the SO2 layer altitude, adding significant value to real-time monitoring of volcanic emissions and climatological analyses. These methods can provide fast and accurate physics-based retrievals of VCD and altitude without regard to solar irradiance, meaning that they are effective day and night and can observe high-latitude SO2 even in the winter. In this study, we detail a probabilistic enhancement of an infrared SO2 retrieval method, based on a modified trace gas retrieval, to estimate SO2 VCD and altitude probabilistically using the Cross-track Infrared Sounder (CrIS) on the Joint Polar Satellite System (JPSS) series of satellites. The methodology requires the characterization of real SO2-free spectra aggregated seasonally and spatially. The probabilistic approach replaces altitude and VCD estimates with probability density functions for the layer height and the partial VCD at multiple heights, fully quantifying the retrieval uncertainty and allowing the estimation of SO2 partitioning by layer. This framework adds significant value over basic VCD and altitude retrieval because it can be used to assign probabilities of SO2 occurrence to different atmospheric intervals. We highlight analyses of several recent significant eruptions, including the 22 June 2019 eruption of Raikoke volcano, in the Kuril Islands; the mid-December 2016 eruption of Bogoslof volcano, in the Aleutian Islands; and the 26 June 2018 eruption of Sierra Negra volcano, in the Galapagos Islands. This retrieval method is currently being implemented in the VOLcanic Cloud Analysis Toolkit (VOLCAT), where it will be used to generate additional cloud object properties for real-time detection, probabilistic characterization, and tracking of volcanic clouds in support of aviation safety.

scholarly journals Probabilistic retrieval of volcanic SO<sub>2</sub> layer height and cumulative mass loading using the Cross-track Infrared Sounder (CrIS)

2020 ◽  
Author(s):  
David M. Hyman ◽  
Michael J. Pavolonis
Keyword(s):  
Real Time ◽  
Probabilistic Approach ◽  
Volcanic Eruptions ◽  
Volcanic Plume ◽  
Volcanic Emissions ◽  
So2 Emissions ◽  
Retrieval Method ◽  
Wide Range ◽  
The Cross ◽  
Cross Track

Abstract. During most volcanic eruptions and many periods of volcanic unrest, detectable quantities of sulfur dioxide (SO2) are injected into the atmosphere at a wide range of altitudes, from ground level to the lower stratosphere. Because the fine ash fraction of a volcanic plume is, at times, collocated with SO2 emissions, global tracking of volcanic SO2 is useful in tracking the hazard long after ash detection becomes dominated by noise. Typically, retrievals of SO2 loading have relied heavily on hyperspectral ultraviolet measurements. More recently, infrared sounders have provided additional loading measurements and estimates of the SO2 layer altitude, adding significant value to real-time monitoring of volcanic emissions as well as climatological analyses. These methods leverage the relative simplicity of infrared radiative transfer calculations, providing fast and accurate physics-based retrievals of loading and altitude. In this study, we detail a probabilistic enhancement of an infrared SO2 retrieval method, based on a modified trace-gas retrieval, to estimate SO2 loading and altitude probabilistically using the Cross-track Infrared Sounder (CrIS) on the Joint Polar Satellite System (JPSS) series of satellites. The methodology requires the characterization of real SO2-free spectra aggregated seasonally and spatially. The probabilistic approach replaces loading and altitude estimates with non-parametric probability density functions, fully quantifying the retrieval uncertainty. This framework adds significant value over basic loading and altitude retrieval because it can be readily incorporated into Monte Carlo forecasting of volcanic emission transport. We highlight results including successes and challenges from analysis of several recent significant eruptions including the 22 June 2019 eruption of Raikoke volcano, Kuril Islands; the mid-December 2016 eruption of Bogoslof volcano; and the 26 June 2018 eruption of Sierra Negra volcano, Galapagos Islands. This retrieval method is currently being implemented in the VOLcanic Cloud Analysis Toolkit (VOLCAT), where it will be used to generate additional cloud object properties for real-time detection, characterization, and tracking of volcanic clouds in support of aviation safety.

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