Research on Narrowband Communications
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Abstract : We report on research toward a very-low-rate vocoder. This quarter we continued investigation in three areas. The first area of research is multi- speaker synthesis: speech synthesis from the transmitted vocoder parameters with the voice quality of the vocoder user. This processing entails speaker-specific spectral transformation of the vocoder diphone database. The second area of research is to improve the accuracy of the phonetic recognition. Our work this quarter concentrated on training the recognizer by augmentation of the diphone database with diphones extracted from natural, continuous speech. The third area of research is the development of an efficient model of continuous speech. We have developed a novel method of a variable-order Markov chain. We are continuing evaluation of this method.Keywords:
Narrowband
Narrowband pass filters are essentially narrowband angle filters, but only in the plane of incidence. It is shown that a combination of tilted polarization-insensitive narrowband pass filters will select light from narrow angle patches.
Narrowband
Brewster's angle
Filtering theory
Plane of incidence
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There are varieties of wideband direction-of-arrival (DOA) estimation algorithms. Their structure comprises a number of narrowband ones, each performs in one frequency in a given bandwidth, and then different responses should be combined in a proper way to yield true DOAs. Hence, wideband algorithms are always complex and so non-real-time. This paper investigates a method to derive a flat response of narrowband multiple signal classification (MUSIC) [R. O. Schmidt, IEEE Trans. Antennas Propag., 34, 276-280 (1986)] algorithm in the whole frequencies of given band. Therefore, required conditions of applying narrowband algorithm on wideband impinging signals will be given through a concrete analysis. It could be found out that array sensor locations are able to compensate the frequency variations to reach a flat response of DOAs in a specified wideband frequency.
Narrowband
Wideband
Frequency band
SIGNAL (programming language)
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In imaging detection of Lyman-a line of solar spectrum, in order to maintain spectral purity, a narrowband 121.6 nm minus filter is in urgent demand. Here, first-, second-, third-order narrowband 121.6 nm minus filters are designed, fabricated, and test. We just give our initial results, and due to complexity in characterization of optical constants in 115-130 nm, there are still significant deviations between design and experimental results.
Narrowband
Characterization
Line (geometry)
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UWB(Ultra Wideband) system takes up extremely wide bandwidth, so it interferes with narrowband communication systems each other easily, that influences the system performance. The main approach to the problem is designing pulse waveform for UWB system to make it have notches in narrowband interferences. The paper designed UWB pulse with APSWF (approximate prolate spheroidal wave functions) that is finite in time domain and frequency domain, made generated pulse satisfy the demand of spectrum hole. The experimental results showed that, the designed pulse could avoid the central frequencies of narrowband systems, and suppressed the narrowband interferences, so solved the coexistence of UWB system and narrowband communication systems successfully.
Narrowband
Wideband
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Recently, a sensor delay-line (SDL) based array structure was proposed for broadband beamforming. It is similar in form to the traditional narrowband beamformer, the only difference being a re-arrangement of the sensor positions according to the SDL concept. However, it is well-known that the narrowband beamformer can perform broadband beamforming to some degree, which gives rise to the question of whether this new arrangement is superior to the narrowband approach or not. The aim of this work is to answer this question by providing a detailed study of sensor positions for broadband beamforming. We show that when the bandwidth exceeds some threshold value, the SDL beamformer significantly outperforms the narrowband beamformer, which well justifies the new structure and gives a clear endorsement to the SDL concept.
Narrowband
Adaptive beamformer
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Abstract The narrowband radiated emission limit curve of the vehicle has changed significantly in the sixth revision of ECER 10. In this article, the emission value of electromagnetic waves at different distances in different frequency bands is measured. Meanwhile, the correspondence between the narrowband radiation emission limits of the whole vehicle and the components is explored. Finally, the correspondence between the far field and near field applicable to narrowband radiation emission of components in automotive inspection engineering is proposed.
Narrowband
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A new criterion sensor narrowband equivalent efficiency (SNEE) is presented for array beamforming techniques. SNEE directly shows the performance when a band signal is processed with a narrowband model, and so it can be used to judge whether a band signal should be seen as narrowband.
Narrowband
SIGNAL (programming language)
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Бұл зерттеужұмысындaКaно моделітурaлы жәнеоғaн қaтыстытолықмәліметберілгенжәнеуниверситетстуденттерінебaғыттaлғaн қолдaнбaлы (кейстік)зерттеужүргізілген.АхметЯссaуи университетініңстуденттеріүшін Кaно моделіқолдaнылғaн, олaрдың жоғaры білімберусaпaсынa қоятынмaңыздытaлaптaры, яғнисaпaлық қaжеттіліктері,олaрдың мaңыздылығытурaлы жәнесaпaлық қaжеттіліктерінеқaтыстыөз университетінқaлaй бaғaлaйтындығытурaлы сұрaқтaр қойылғaн. Осы зерттеудіңмaқсaты АхметЯсaуи университетіндетуризмменеджментіжәнеқaржы бaкaлaвриaт бaғдaрлaмaлaрыныңсaпaсынa қaтыстыстуденттердіңқaжеттіліктерінaнықтaу, студенттердіңқaнaғaттaну, қaнaғaттaнбaу дәрежелерінбелгілеу,білімберусaпaсын aнықтaу мен жетілдіружолдaрын тaлдaу болыптaбылaды. Осы мaқсaтқaжетуүшін, ең aлдыменКaно сaуaлнaмaсы түзіліп,116 студенткеқолдaнылдыжәнебілімберугежәнеоның сaпaсынa қaтыстыстуденттердіңтaлaптaры мен қaжеттіліктерітоптықжұмыстaрaрқылыaнықтaлды. Екіншіден,бұл aнықтaлғaн тaлaптaр мен қaжеттіліктерКaно бaғaлaу кестесіменжіктелді.Осылaйшa, сaпa тaлaптaры төрт сaнaтқa бөлінді:болуытиіс, бір өлшемді,тaртымдыжәнебейтaрaп.Соңындa,қaнaғaттaну мен қaнaғaттaнбaудың мәндеріесептелдіжәнестуденттердіңқaнaғaттaну мен қaнaғaттaнбaу деңгейлерінжоғaрылaту мен төмендетудеосытaлaптaр мен қaжеттіліктердіңрөліaйқын aнықтaлды.Түйінсөздер:сaпa, сaпaлық қaжеттіліктер,білімберусaпaсы, Кaно моделі.
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The nationally-recognized Susquehanna
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The 'narrowband' assumption is often made in the analysis of array signal processing algorithms. The author provides a definition for the notion of narrowband, and the derivation of an expression which is useful in determining if a particular scenario qualifies as narrowband. The expression derived correctly predicts where the narrowband assumption fails for some super-resolution algorithms, the Cramer–Rao bound on angle estimation and the signal-to-interference plus noise performance of adaptive beamformers.
Narrowband
Expression (computer science)
SIGNAL (programming language)
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