%Aigaion2 BibTeX export from Idiap Publications
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@TECHREPORT{Taghizadeh_Idiap-RR-39-2011,
         author = {Taghizadeh, Mohammad J. and Garner, Philip N. and Bourlard, Herv{\'{e}}},
       keywords = {Broadband beam-pattern, Delay-and-sum beamformer, Directivity, Distant speech recognition, Superdirective beamformer},
       projects = {Idiap, IM2},
          month = {12},
          title = {BROADBAND BEAMPATTERN FOR MULTI-CHANNEL SPEECH ACQUISITION AND DISTANT SPEECH RECOGNITION},
           type = {Idiap-RR},
         number = {Idiap-RR-39-2011},
           year = {2011},
    institution = {Idiap},
       abstract = {Spatial filtering is the fundamental characteristic of microphone
array based signal acquisition which plays an important role in applications
such as speech enhancement and distant speech recognition.
In the array processing literature, this property is formulated upon
beam-pattern steering and it is characterized for narrowband signals.
This paper proposes to characterize the microphone array broadband
beam-pattern based on the average output of a steered beamformer
for a broadband spectrum. Relying on this characterization,
we derive the directivity beam-pattern of delay-and-sum and
superdirective beamformers for a linear as well as a circular microphone
array. We further investigate how the broadband beam-pattern
is linked to speech recognition feature extraction; hence, it can be
used to evaluate distant speech recognition performance. The proposed
theory is demonstrated with experiments on real data recordings.},
            pdf = {https://publications.idiap.ch/attachments/reports/2011/Taghizadeh_Idiap-RR-39-2011.pdf}
}