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research article

Raking the Cocktail Party

Dokmanic, Ivan  
•
Scheibler, Robin  
•
Vetterli, Martin  
2015
IEEE Journal of Selected Topics in Signal Processing

We present the concept of an acoustic rake receiver—a microphone beamformer that uses echoes to improve the noise and interference suppression. The rake idea is well-known in wireless communications; it involves constructively combining different multipath components that arrive at the receiver antennas. Unlike spread-spectrum signals used in wireless communications, speech signals are not orthogonal to their shifts. Therefore, we focus on the spatial structure, rather than temporal. Instead of explicitly estimating the channel, we create correspondences between early echoes in time and image sources in space. These multiple sources of the desired and the interfering signal offer additional spatial diversity that we can exploit in the beamformer design. We present several “intuitive” and optimal formulations of acoustic rake receivers, and show theoretically and numerically that the rake formulation of the maximum signal-to-interference-and-noise beamformer offers significant performance boosts in terms of noise and interference suppression. Beyond signal-to-noise ratio, we observe gains in terms of the perceptual evaluation of speech quality (PESQ) metric for the speech quality. We accompany the paper by the complete simulation and processing chain written in Python. The code and the sound samples are available online at http://lcav.github.io/AcousticRakeReceiver/.

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Type
research article
DOI
10.1109/JSTSP.2015.2415761
Web of Science ID

WOS:000357932100007

Author(s)
Dokmanic, Ivan  
Scheibler, Robin  
Vetterli, Martin  
Date Issued

2015

Publisher

Ieee-Inst Electrical Electronics Engineers Inc

Published in
IEEE Journal of Selected Topics in Signal Processing
Volume

9

Issue

5

Start page

825

End page

836

Subjects

Room impulse response

•

beamforming

•

echo sorting

•

acoustic rake receiver

•

LCAV-APDA

URL

URL

http://github.com/LCAV/AcousticRakeReceiver
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCAV  
Available on Infoscience
July 21, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/105196
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