Gerald Friedland Kristian Jantz Lars Knipping Raúl Rojas The Virtual Technician: An Automatic Software Enhancer for Audio Recording in Lecture Halls. 744-750 2005 conf/kes/2005-1 KES (1) http://dx.doi.org/10.1007/11552413_106 db/conf/kes/kes2005-1.html#FriedlandJKR05