Saturday, May 11, 14:00 – 16:30 h
(Special Event – All Badge Colors Welcome)
Chair: Ernst-Jo. Völker, Institute for Acoustic and Building Physics, Oberursel, Germany
14:00 h
Q1 The Legendary Tape Recorder MAGNETOPHON of AEG – Manfred Krause, Technical University of Berlin, Berlin, Germany
Q2 First Loudspeakers - Some Historical Aspects - Hans-Otto Hoffman, Bavarian Radio and Broadcasting Corporation, München, Germany
Q3 Phillip Reis - From the First Telephone to the First Microphone -- Ernst-Jo. Völker, Sabine Fischer, Institute for Acoustic and Building Physics, Oberursel, Germany
On October 26, 1861, Phillip Reis presented a lecture to the members of the 'Physikalischer Verein' in Frankfurt, Germany. The subject was entitled 'The transmission of tones via galvanic current over wide distances'. His telephone consisted of a thin membrane which produced, with the frequency of sound, a change of the current by just switching a contact. This was easily transmitted to the receiver at around a 200 m distance. The corpus of a violin was shook by a small electromagnetic device which was known from telegraphy. The violin irradiated the sound in such a way that a melody could be heard. Even some words and short sentences were transmitted. For his work and his many improvements he received the title 'Meister des Freien Deutschen Hochstifts'. This 'Hochstift' and its scientific work was the offspring of the later founded Frankfurt University. The work of Phillip Reis was published in technical periodicals at that time. Some years later, his telephone was produced by a small company in Frankfurt which sold the sender and the receiver all over the world. The small village of Freidrichdorf, located in the Taunus hills near Frankfurt, was, at that time, not interested in having wire connections from village to village. In the 1860's many small German states existed before the unification in 1871. Ten to fifteen years later the need for communication lines using the new telephone of Graham Bell was extreme. Now Phillip Reis was remembered as the first inventor. For him however, it was too late. He died in 1874.
The idea of a so called contact microphone was overtaken by the electro-magnetic system of Bell, changing the amplitude of transmitted current. The next step was the invention of Edison's carbon microphone.
The paper will describe the work of Phillip Reis at the beginning of a new century of telecommunication technology.
Convention Paper 5606
15:30 h
Q4 Selected Highlights of Microphone History – Erhard Werner, Hademstorf, Germany
When the microphone celebrated its 100th anniversary, so many famous products and corresponding literature had been accumulated that only premium authors succeeded in giving short but also comprehensive surveys. Meanwhile microphone technology has been refined in various properties making a �complete� survey even less possible. Therefore some highlights of the principle and of main properties have been selected to show what happened from the first realization to the present stage.
Convention Paper 5607
16:00 h
Q5 Audio and Video Storage Without Mechanics – Otto Willer, Joseph & Winkler, Ingentix, Köln, Germany
This last presentation will be preceded by an introduction titled On the History of Information Storage - To Systems Without Mechanical Parts written by Heinz Thiele (deceased) and now being presented by Herman Wilms, AES-Europe Office, Brussel, Belgium
