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Linear and Sinusoidal Frequency Changes of Signals in a Room

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This paper investigates changes (modifications) of instantaneous frequency of signals with linear and sinusoidal frequency sweeps, as they propagate in a room. The modification of the instantaneous frequency of these signals is investigated numerically and experimentally.

When interference with only a single reflected wave is considered, signals with a linear frequency sweep exhibit changes of instantaneous frequency proportional to the sweep rate, and to the delay time of the reflected wave. For sinusoidal modulation, changes in the instantaneous frequency depend mainly on the modulation frequency and the frequency deviation. Extreme excursions of the instantaneous frequency coincide in the time domain to minima of the amplitude envelope of the resultant signal.

It is additionally shown from measurements in a real room, that increasing the modulation frequency causes a decrease in the frequency deviation of the signal in the room.
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Document Type: Research Article

Publication date: September 1, 1997

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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