نتایج جستجو برای: loudspeaker

تعداد نتایج: 4001  

Journal: :Journal of the Audio Engineering Society 2014

2007
Edwin Mabande Walter Kellermann

ABSTRACT In this paper, the superdirective beamforming principle as applied to loudspeaker arrays is investigated. Novel superdirectional beamformer designs (e.g. by Parra, [1]) offer significant spatial selectivity at low frequencies and allow for a small array aperture and some variability in loudspeaker positioning. The theoretical gains of superdirectional beamforming are generally difficul...

2001
Felipe Orduña-Bustamante José J. López Alberto González

The condition number of the matrix of electro-acoustic headrelated transfer functions (HRTF) in a two-channel sound reproduction system has been used as a measure of robustness of the Atal-Schroeder crosstalk canceler. A comparative study has been made using results produced by computer simulations and HRTFs measured in an anechoic chamber by means of a dummy head. It has been found that acoust...

Journal: :The Journal of the Acoustical Society of America 2009
Mingsian R Bai Chau-Min Huang

This work aims at the development of an expert diagnostic system for moving-coil loudspeakers. Special emphasis is placed on the defects resulting from loudspeaker nonlinearities. As a loudspeaker operates in the large signal domain, nonlinear distortions may arise and impair sound quality. Analysis of nonlinear responses can shed light on potential design faults of a loudspeaker. By exploiting...

2015
chuang shi yoshinobu kajikawa

A sound reproduction system usually consists of several types of loudspeakers to cater to sophisticated applications. The directivity of a loudspeaker is a measure of its efficiency in sending sounds to a particular direction instead of all directions. Demand to control the directivity of a sound reproduction system is gaining momentumwith many new designs of directional loudspeakers, including...

2010
Danilo Comminiello Michele Scarpiniti Raffaele Parisi Aurelio Uncini

The presence of loudspeaker distortions in the echo path affects the performance of a conventional acoustic echo canceller (AEC). In order to address this problem we introduce a novel nonlinear acoustic echo cancellation (NAEC) architecture based on the adaptive combination of linear and nonlinear filters. The nonlinear filtering is performed by a functional link network (FLN) whose task is to ...

2007
H. Schurer

Practical loudspeakers are nonlinear transducers, i.e. the acoustic output is not a linear representation of the electrical input signal. In this paper two loudspeakers are considered; a loudspeaker for reproduction of low frequencies (woofer) and a horn loudspeaker. Instead of improving the behavior of the two transducers by constructional means we apply a feedforward nonlinear digital inverse...

Journal: :IEEE Transactions on Broadcast and Television Receivers 1969

2004
Gerald Enzner Dirk Mauler Peter Vary

Introduction There is a strong acoustic coupling between loudspeaker and microphone of car hands-free telephones. A power coupling factor between -10 dB and 10 dB must be expected. The exact value depends on the desired loudspeaker volume in the presence of background noise and on the installation of loudspeaker and microphone in the car. The impulse response of this electroacoustic loop has a ...

2009
Mathias REMY Guy LEMARQUAND Gael GUYADER G. Guyader

This paper presents a small wide-band loudspeaker. Particular efforts have been made to reduce the nonlinearities of the loudspeaker as much as possible. The motor structure is completely ironless, the elastomer suspensions are replaced by ferrofluid seals and a monobloc carbon foam piston substitutes the traditional conic membrane. The circular radiating surface, which is flat, has a diameter ...

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