PROGRAMM - DAGA 2012

126 DAGA 2012 ProgrammThe resulting raw SNR estimate has to be corrected by a mapping functionwhich was trained by means of speech data in 15 different languagesand car noise data. Based on speech signals with a length of 80seconds, the proposed method achieved a maximum of 1 dB absoluteerror in more than 90% of the test conditions and a correlation coefficientlarger than 0.99 compared to state-of-the-art reference-based SNRmeasurement employing P.56 reference levels.Dienstag (bis Mi. 12:00)Sprachverarbeitung (Poster)A Stereophonic Acoustic Front-End for Distant-Talking Interfacesbased on Blind Source SeparationK. Reindl, Y. Zheng, A. Schwarz, S. Meier, R. Maas, A. Sehr und W.KellermannUniv. Erlangen-Nürnberg - Multimediakomm. u. SignalverarbeitungIn this contribution, an acoustic front-end for distant-talking interfacesthat only requires two microphone signals is presented. It comprisesa directional blind source separation (BSS)-based noise and interferenceestimation scheme and Wiener-type filters for noise and interferencesuppression. This allows a separation of all undesired signal componentsfrom the desired source signal if the position of the desired sourceis approximately known. The coarse estimate for the target positionprovides a geometric constraint for BSS (’constrained BSS’) which thenprovides an estimate for all undesired interfering speech sources andbackground noise and thereby allows to effectively cope with underdeterminedscenarios (more simultaneously active sources than availablesensors) in noisy and reverberant environments. This noise referenceis then exploited by Wiener-type filters for suppressing the undesiredsignal components in the individual sensor signals. The proposed frontendand its integration into the recognition system is analyzed and evaluatedin noisy living-room-like environments according to the PASCALCHiME challenge. The results show that the introduced system significantlyimproves the recognition performance compared to the challengebaseline and also outperforms simple alternatives, i.e., a two-channelDelay & Sum beamformer as front-end.Dienstag (bis Mi. 12:00)Sprachverarbeitung (Poster)Klangbildbewertung einer konventionellen und einer speziell fürHörgeschädigte erstellten TV-Stereo-MischungL. Hofmann, C. Simon, G. Fassio und B. AlbrechtStudiengang Ton, HFF PotsdamDie Nutzung von audiovisuellen Medien ist für Schwerhörige nur eingeschränktmöglich. Die Dipl.- Tonmeister Ginetta Fassio und Christian Simonhaben ein Verfahren entwickelt, welches die Sprachverständlichkeitaudiovisueller Medien für Hörgeschädigte in der Herstellung verbessert.Die Ergebnisse ihrer Forschungsarbeit wurden auf der DAGA 2011 präsentiert.In einer weiteren Studie wurde nun die klangliche Veränderung