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Time-Domain Beamforming and Blind Source Separation: Speech Input in the Car Environment
Contributor(s): Bourgeois, Julien (Author), Minker, Wolfgang (Author)
ISBN: 1441943323     ISBN-13: 9781441943323
Publisher: Springer
OUR PRICE:   $132.99  
Product Type: Paperback - Other Formats
Published: November 2010
Qty:
Additional Information
BISAC Categories:
- Technology & Engineering | Electrical
- Science | Acoustics & Sound
- Technology & Engineering | Electronics - General
Dewey: 621.384
Series: Lecture Notes in Electrical Engineering
Physical Information: 0.51" H x 6.14" W x 9.21" (0.75 lbs) 225 pages
 
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Publisher Description:
The development of computer and telecommunication technologies led to a revolutioninthewaythatpeopleworkandcommunicatewitheachother.One of the results is that large amount of information will increasingly be held in a form that is natural for users, as speech in natural language. In the presented work, we investigate the speech signal capture problem, which includes the separation of multiple interfering speakers using microphone arrays. Adaptive beamforming is a classical approach which has been developed since the seventies. However it requires a double-talk detector (DTD) that interrupts the adaptation when the target is active, since otherwise target cancelation occurs. The fact that several speakers may be active simulta- ouslymakesthisdetectiondi?cult, andifadditionalbackgroundnoiseoccurs, even less reliable. Our proposed approaches address this separation problem using continuous, uninterrupted adaptive algorithms. The advantage seems twofold: Firstly, thealgorithmdevelopmentismuchsimplersincenodetection mechanism needs to be designed and no threshold is to be tuned. Secondly, the performance may be improved due to the adaptation during periods of double-talk. In the ?rst part of the book, we investigate a modi?cation of the widely usedNLMSalgorithm, termedImplicitLMS(ILMS), whichimplicitlyincludes an adaptation control and does not require any threshold. Experimental ev- uations reveal that ILMS mitigates the target signal cancelation substantially with the distributed microphone array. However, in the more di?cult case of the compact microphone array, this algorithm does not su?ciently reduce the target signal cancelation. In this case, more sophisticated blind source se- ration techniques (BSS) seem neces