Focused wideband adaptive array processing algorithms are used for the high-resolution aeroacoustic directionfinding of ground vehicles. Methods based on coherent focusing such as steered covariance matrix (STCM), and spatial smoothing or interpolation using the array manifold interpolation (AMI) method, will be discussed [1, 2]. Experimental results for a circular array are presented comparing...

Wideband speech transmission is one of the technologies discussed for use in wireless systems and VoIP scenarios to provide a quality dimension significantly different from today’s narrowband communication systems. While the problem of wideband speech coding is mostly solved the requirements for a wideband speech service are still under discussion. 3G mobile networks and VoIP networks both allo...

A novel method for optical generation of ultra-wideband signals with a reconfigurable spectral notch-band is proposed. In the proposed system, ultra-wideband signals are generated in the optical domain and an optical tunable delay line is deployed to introduce a notch-band to the spectral profile of the generated ultra-wideband signals, which can effectively avoid the signal interference betwee...

This paper investigates Waveform Interpolation (WI) applied low bit rate wideband speech coding. An analysis of the evolutionary behaviour of wideband Characteristic Waveforms (CWs) shows that direct application of the classical WI algorithm may not be appropriate for wideband speech. We propose a modification whereby CW quantisation is performed using classical WI decomposition for the low fre...

Most of the MR image accelerating methods suffer from degradation of acquired images, which is often correlated with the degree of acceleration. However, Wideband MRI is a novel technique that transcends such flaws. In this study we demonstrate that Wideband MRI is capable of obtaining images with identical quality as conventional MR images in terms of SNR, CNR (contrast-to-noise ratio) and ima...

Recently deconvolution-based methods, like the DAMAS, have greatly improved spatial resolutions of the Beamforming in aeroacoustic imaging. But most of existing methods are not robust to background noise. In this paper, we propose two robust superresolution approaches using Sparsity Constraint (SC-RDAMAS) and Sparse Regularisation (SR-RDAMAS) respectively to simultaneously estimate source power...

In this article, a simple and compact dual bandnotched (DBN) super wideband (SWB) printed monopole antenna (PMA) has been proposed. The proposed antenna composed of a circular PMA, which is connected through a 50-Ω triangular tapered microstrip fed line (TTMFL) and a round-cornered finite ground plane (RCFGP). It exhibits a very wide frequency band from 1.6–25 GHz (ratio bandwidth of 15.63:1) w...

Recently, new objective speech quality evaluation methods, designed and adapted to new high voice quality contexts, have been developed. One interest of these methods is that they integrate voice quality perceptual dimensions reflecting the effects of frequency-response distortions, discontinuities, noise and/or speech level deviations respectively. This makes it possible to use these methods a...

Oh Heon Kwon 1, Won Bin Park 1, Sungwoo Lee 1, Jong Min Lee 1, Young Mi Park 2 and Keum Cheol Hwang 1,* 1 School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea; [email protected] (O.H.K.); [email protected] (W.B.P.); [email protected] (S.L.); [email protected] (J.M.L.) 2 Electronic Warfare PMO, Agency for Defense Development, Daejeon 305-600, Korea; y...