Audio classification is very important in many audio applications so that different audio signal can be processed appropriately. We propose an audio classification scheme which will categorise audio based on a number of audio features. These features include silence ratio, spectral centroid, harmonicity and pitch. Our preliminary experiments with silence ratio feature produce very promising cla...

This paper introduces a novel voiced/unvoiced classification of speech signal for short time frames, sica 8ms, which do not encompass more than one pitch period. The classification scheme takes into account not only usual features related to the speech frame like its energy and its normalized power spectrum density but also statistical features like the median and the difference between the max...

During four aircraft field experiments with the DLR research aircraft Falcon in 1998 (LACE), 2006 (SAMUM-1) and 2008 (SAMUM-2 and EUCAARI), airborne High Spectral Resolution Lidar (HSRL) and in situ measurements of aerosol microphysical and optical properties were performed. Altogether, the properties of six different aerosol types and aerosol mixtures – Saharan mineral dust, Saharan dust mixtu...

We demonstrate binary spectral phase coded waveform discrimination at 10 GHz for narrow band optical code-division multiple-access (NB-OCDMA) via direct electrical detection without using any optical hard-limiter. Only 9 phase-locked, 10 GHz spaced, spectral lines within a 100 GHz spectral window are used for the phase coding. Considerably high contrast ratio of 5 between signal and multiuser a...

PURPOSE The purpose of this study was to investigate the clinical feasibility of spectral analyses using dual-layer detector spectral computed tomography (CT) in acute intracerebral haemorrhage (ICH). MATERIAL AND METHODS We retrospectively reviewed patients with acute ICH who underwent CT angiography on a dual-layer detector spectral CT scanner. A spectral data analysis was performed to dete...

This paper describes a novel real-time multi-spectral imaging capability for surveillance applications. The capability combines a new high-performance multi-spectral camera system with a distributed algorithm that computes a spectral-screening Principal Component Transform (PCT). The camera system uses a novel filter wheel design together with a high-bandwidth CCD camera to allow image cubes to...