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Die mechanischen Eingangsimpedanzen von Tonabnehmern

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When playing back phonograph records, commercial crystal pickups reproduce frequencies below 400 c/s only with large nonlinear distortions. The high mechanical input impedance is shown to be responsible for these distortions: the lateral dynamical force rises to such high values, that the stylus loses the contact with one of the groove walls.

In order to determine the forces acting upon the stylus tip, the lateral and vertical mechanical input impedances are measured by one vibrometer each. Unlike the instruments previously used for these measurements, the vibrometer allows one to take measurements in the whole audio-frequency range without changing the vibrating system and with pure sinusoidal motion. Results are given for several pickups in the form of the circle diagram of the input impedance in the complex impedance plane.
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Document Type: Research Article

Publication date: January 1, 1955

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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