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The Tampura Bridge as a Precursive Wave Generator

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The tampura bridge generates on a string a quasi-periodic precursive wave, responsible for a strong narrow formant. It arises shortly after the attack, with a slowly decaying frequency. Due to the wave dispersion, at every cycle, the front part of a corner precursor is not trapped between the string-bridge contact and the “juari” thread; these similar “cuts” are “pasted” one after the other, to form the quasi-periodic precursor. This mechanism can be imitated without any tampura. The frequency decay is controlled by the dispersion and by the dampings, including that of the string on the bridge.

Zusammenfassung

Der Tampura-Steg erzeugt auf einer Saite eine quasiperiodische Vorwelle, die für einen starken, engen Formanten verantwortlich- ist. Sie tritt kurz nach Anreißen der Saite mit langsam abnehmender Frequenz auf. Aufgrund der Dispersion der Wellen entgeht der Anfang eines Vorläufers in jedem Zyklus dem Einfangen zwischen dem “Jurai”-Draht und dem Kontaktpunkt Saite-Steg. Die ähnlichen “Ausschnitte” werden untereinander verbunden und bilden den quasi-periodischen Vorläufer. Der beschriebene Mechanismus kann auch ohne Tampura erzeugt werden. Die Frequenzabnahme wird durch die Dispersion und die Dämpfung bewirkt, einschließlich der Dämpfung zwischen Saite und Steg.

Sommaire

Le chevalet de tampoura génère dans la corde une onde précursive quasi-périodique, responsable d'un formant intense et étroit. Elle apparaît peu après l'attaque, sa fréquence décroit lentement. A cause de la dispersion des ondes, à chaque cycle, la partie frontale précursive d'un point anguleux échappe au piège formè entre le fil «juari» et le point de contact corde/chevalet; ces «morceaux» similaires sont «collés» l'un derriere l'autre, pour constituer le précurseur quasi-périodique. On peut imiter ce mécanisme en l'absence de tampoura. La décroissance de fréquence est contrôlée par la dispersion et les amortissements, y compris celui de la corde sur le chevalet.
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Document Type: Research Article

Publication date: August 1, 1991

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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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