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Die Eignung des dynamischen Kopfhörers zur Untersuchung frequenzmodulierter Töne

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Ear canal resonances could spoil the use of dynamic earphones as calibrated head phones. How ever, a thorough investigation of these resonances shows that they are strongly damped and their intensity is less than ± 3 db. By using a set of two equalizer networks ahead of the earphones the frequency response of the transmission-factor oft he earphones is made uniform within ± 3 db from 20 to 15 000 c/s. Since this frequency response is not only uniform but also very smooth and flat, it becomes possible to use these headphones for measurements of frequency-modulated tones too. The second and third harmonics due to nonlinear distortion of the headphones are less than 1‰ of the fundamental at sound intensities of 90 db and for frequencies above 100 c/s.
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Document Type: Research Article

Publication date: January 1, 1952

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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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