Freie Universität Berlin, Fachbereich Mathematik und Informatik : Ser. B, Informatik ; 04,14
004 Datenverarbeitung; Informatik
Webcasting and recording of university lectures has become common
practice. While much effort has been put into the development and improvement
of formats and codecs, few computer scientist have studied how
to improve the quality of the signal before it is digitized. A Lecture hall
or a seminar room is not a professional recording studio. Good quality
recordings require full-time technicians to setup and monitor the signals.
Although often advertised, most current systems cannot yield professional
quality recordings just by plugging a microphone into a sound card and
starting the lecture. This paper describes a lecture broadcasting system
that eases studioless voice recording by automatizing several tasks usually
handled by professional audio technicians. The software described
here measures the quality of the sound hardware used, monitors possible
hardware malfunctions, prevents common user mistakes, and provides
gain control and filter mechanisms.
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