![]() ![]() ![]() Results of the recent investigation of the phonograph sound path in ETI support the topic. Particularly the construction, the mechanical sound ampli cation of the horn, and acoustical pro le of the Stroh violin and the phonograph are discussed. The principle of the sound emission in the Stroh violins and in the recording machines is in the focus of this work. The diaphragm and the horn have their own resonances, which color the sound of a bowed string, and the sound o the horn axis is much \thinner". The Stroh violins do not have a vibrating surface, but a circular diaphragm which translates the string vibration to the horn (a bit similar to the horn loudspeaker). Therefore it inhabited the recording spaces in England, Germany and USA until around 1925, when the microphone technology allowed a balanced reproduction of music. It had a comparable to the violin tone color, and a much stronger projection. ![]() The Stroh violin was invented and patented in Britain by J. A need for a violin with a stronger sound projection than the traditional violins appeared in the recording studios. At the time of invention of the mechanical recording machine, the phonograph, the string section was hardly heard on the playback, if the musicians during recording were not standing directly before the horn. ![]()
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