Adaptation control of beamforming interference cancellation techniques is investigated for in-car speech acquisition. Two efficient adaptation control methods are proposed that avoid target cancellation. The 'implicit' method varies the step-size continuously, based on the filtered output signal. The 'explicit' method decides in a binary manner whether to adapt or not, based on a novel estimate of target and interference energies. It estimates the average delay-sum power within a volume of space, for the same cost as the classical delay-sum. Experiments on real in-car data validate both methods, including a case with 100 km/h background road noise.
Sector-based detection for hands-free speech enhancement in cars
EURASIP Journal on Applied Signal Processing ; 12 ; 1-15
2006
15 Seiten, 8 Bilder, 2 Tabellen, 28 Quellen
Article (Journal)
English
Strahlformung , Fokussierung , Richtcharakteristik , Strahlenbündel , Adaptivregelung , adaptive Optimiersteuerung , Adaptivfilter , adaptives System , Interferenzunterdrückung , Interferenzpegel , Autoradio , Radioentstör-Set , Kraftfahrzeugelektrik , Filtereinrichtung , Freisprecheinrichtung , Sprachsteuerung
Robust superdirectional beamforming for hands-free speech capture in cars
Tema Archive | 2009
|