Ego-Noise Reduction Using a Motor Data-Guided Multichannel Dictionary
Résumé
We address the problem of ego-noise reduction,
i.e., suppressing the noise a robot causes by its own motions.
Such noise degrades the recorded microphone signal massively
such that the robot’s auditory capabilities suffer. To suppress
it, it is intuitive to use also motor data, since it provides
additional information about the robot’s joints and thereby
the noise sources. We propose to fuse motor data to a recently
proposed multichannel dictionary algorithm for ego-noise reduction.
At training, a dictionary is learned that captures spatial
and spectral characteristics of ego-noise. At testing, nonlinear
classifiers are used to efficiently associate the current robot’s
motor state to relevant sets of entries in the learned dictionary.
By this, computational load is reduced by one third in typical
scenarios while achieving at least the same noise reduction
performance. Moreover, we propose to train dictionaries on
different microphone array geometries and use them for egonoise
reduction while the head to which the microphones
are mounted is moving. In such scenarios, the motor guided
approach results in significantly better performance values.
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