A new wideband Wilkinson Power Divider which use the nonuniform substrate integrated waveguide (NSIW) method is presented in this paper. This structure utilizes NSIWs instead of the uniform quarter wavelength SIWs in conventional Wilkinson power divider. The proposed structure is analyzed by odd and even mode analysis. The proper NSIW section widths can be extracted by using even mode while the...

To build high quality wideband acoustic models for automatic speech recognition (ASR), a large amount of wideband speech training data is required. However, for a particular language, one may have available a lot of narrowband data, but only a limited amount of wideband data. This paper deals with such situation and proposes a narrowband to wideband expansion algorithm that expands the narrowba...

In anticipation of upcoming mobile telephony services with higher speech quality, a wideband (50 Hz to 7 kHz) mobile telephony derivative of TIMIT has been recorded called WTIMIT. It opens up various scientific investigations; e.g., on speech quality and intelligibility, as well as on wideband upgrades of network-side interactive voice response (IVR) systems with retrained or bandwidth-extended...

This paper proposes two rectangular ring planar monopole antennas for wideband and ultra-wideband applications. Simple planar rectangular rings are used to design the planar antennas. These rectangular rings are designed in a way to achieve the wideband operations. The operating frequency band ranges from 1.85GHz to 4.95GHz and 3.12GHz to 14.15GHz. The gain varies from 1.83 dBi to 2.89 dBi for ...

Communication is migrating towards wideband transmission (50 Hz – 7 kHz). Terminals and networks are developed in order to provide a significant step towards higher speech quality. At the same time, standardization bodies like ETSI, GCF and the DECT Forum are working on new specifications for terminals. In order to setup appropriate speech quality measurements for wideband terminals, existing w...

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...