Some of the differences between broadband and narrowband sonar systems applied in fisheries hydroacoustics are examined. Following a brief discussion of the advantages and disadvantages of broadband sonar, three different aspects of narrowband and broadband sonar systems are compared: detection, Doppler processing, and split-beam localization. Summaries are provided that compare representative ...

This paper addresses the problem of reconstructing wideband speech signals from observed narrowband speech signals. The goal of this work is to improve the perceived quality of speech signals which have been transmitted through narrowband channels or degraded during acquisition. We describe a system, based on linear predictive coding, for estimating wideband speech from narrowband. This system ...

In recent years research in the area of artificial bandwidth extension (BWE) of speech signals has made significant progress. The intention of BWE is to produce wideband speech with a cut-off frequency of for instance 7 kHz from a narrowband version (e.g., with telephone bandwidth, i.e., 300Hz − 3.4 kHz). The respective algorithms are based on the estimation of parameters of a source model for ...

Narrowband photodetectors have broad application prospects in many fields where only a range of specific wavelengths light needs to be detected. However, the current narrowband detectors some disadvantages, such as integration is difficult, full width at half-maximum not narrow enough, and spectral rejection ratio ideal (≤20). Here, we present self-filtering photodetector based on MAPbX3 single...

In February of 2002, the FCC approved the use of ultra-wideband (UWB) technology for commercial use. UWB has since been considered as a solution for the next generation of personal area networks (PANs) and wireless local area networks (WLANs). UWB (or impulse) radio employs short duration pulses to communicate, thereby spreading signal energy very “thinly” from DC to a few gigahertz [1]. The “u...

The HIgh-Time resolution (HIT) mode of FORS2 has 3 sub-modes that allow for imaging and spectroscopy over a range of timescales from milliseconds up to seconds. It is the only high time resolution spectroscopy mode available on an 8 m class telescope. In imaging mode, it can be used to measure the pulse of pulsars and spinning white dwarfs in a variety of high throughput broadand narrowband fil...

The 'rnuffl~d' quality of coded .peech, which arises from the handlimiling ofspeech to 4 kHz, can be reduced either by coding speed! with a wider bandwidth or by widcband enhancement of the narrowband coded speech. ThL~ paper investigates the limitations of wideband enbancement and pO)Ssibilities for its improvement A new wideband coding scheme is prop()sed thaI i. based 00 any narrowband coder...

A comparison of weighted and non-weighted transform domain processing systems for narrowband interference excision. Adaptive narrowband interference rejection in a ds spread spectrum intercept receiver using transform domain signal processing techniques. IEEE Transactions on Communications , 37, 1989. 4] John Guilford and P. Das. The use of the adaptive lattice lter for narrowband jammer reject...

Adaptive power control has widely been used in DS/CDMA systems to overcome the so-called “near-far” problem. This paper studies the adaptive open-loop power control of a cellular CDMA system, which is overlaid in the downlink by a narrowband signal. The effects of downlink power allocation schemes to power control error in the presence of narrowband interference are analyzed. In order to get a ...