NDLI: Combined software/hardware implementation of a filterbank front-end for speech recognition

Content Provider	IEEE Xplore Digital Library
Author	Mouchtaris, A. Cao, Y. Khan, S. Van der Spiegel, J. Mueller, P.
Copyright Year	2005
Description	Author affiliation: Dept. of Comput. Sci., Crete Univ., Greece (Mouchtaris, A.)
Abstract	In this paper, a cost-effective implementation of a programmable filterbank front-end for speech recognition is presented. The objective has been to design a real-time bandpass filtering system with a filterbank of 16 filters, with analog audio input and analog output. The output consists of 16 analog signals, which are the envelopes of the filter outputs of the audio signal. These analog signals are then led to an analog neural computer, which performs the feature-based recognition task. One of the main objectives has been to allow the user to easily change the filter specifications without affecting the remaining system, thus a software implementation of the filterbank was preferred. In addition, the neural computer requires analog input. Therefore, we implemented the filterbank on a PC, with the input A/D and the output D/A performed by the PC stereo soundcard. Since multiple analog outputs are necessary for the neural computer (one for each filter), it then follows that the soundcard output should contain the multiplexed 16 filter outputs, while hardware module is needed for demultiplexing the soundcard output into the final 16 analog signals.
Starting Page	436
Ending Page	441
File Size	326260
Page Count	6
File Format	PDF
ISBN	0780393333
ISSN	15206130
DOI	10.1109/SIPS.2005.1579908
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-02
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hardware Filter bank Speech recognition Analog computers Band pass filters Filtering Envelope detectors Signal processing Data acquisition Graphical user interfaces
Content Type	Text
Resource Type	Article

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