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Über die Hörbarkeit komplexer Schallsignale auf Schiffen

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As a continuation of earlier investigations of the perceptibility of sinusoidal tones in the noise of ships at sea, the audibility has been investigated of complex signals as they are actually employed in navigation. The observations were made in a studio from sound recordings of ships' noise and signals. For some experiments moreover, an electrically produced noise was used for masking. The signals – typhone, bugle call and a horn – differed in their fundamentals, harmonics content and in the frequency range of their third octave peaks. In order to investigate systematically the dependence of the masking thresholds on the character of the signal spectrum, the square wave impulses of various pulse frequencies were applied through a band-pass filter from a 55-Hz-pulse.

The results of the investigation show generally that a signal is certainly audible when its third octave level curve reaches, at least for one third octave range, to the corresponding curve of the disturbing noise. In many cases a third octave signal level lower by 5 dB is already sufficient. Only at low frequencies (below 250 Hz) must the third octave level of the signal reach up to 10 dB above the noise level in the range under consideration.
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Document Type: Research Article

Publication date: January 1, 1965

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  • 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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