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Featured researches published by Sharmistha Sarkar Das.


international conference on acoustics, speech, and signal processing | 2002

Application of automatic speech recognition in call classification

Sharmistha Sarkar Das; Norman C. Chan; Danny M. Wages; John H. L. Hansen

Call classification is the process of characterizing the audio signals encountered when a phone call is placed. The signal can be a live person, an answering machine, a call progress tone (ringback, busy, etc.), a fax modem tone or an announcement message. Call processing system uses the output of the call classifier to perform automated call routing. Traditionally, in-band signaling between communication system endpoints and users are in the form of audible tones. With the advent of technology, these signals have been augmented by synthesized and recorded human speech. A “busy tone”, for example, may be replaced by recorded speech. Traditional call classifiers, which are mainly tone detectors, have become increasingly ineffective. This paper proposes a new generation call classifier employing Automatic Speech Recognition (ASR). Modifications of the ASR paradigm are suggested to incorporate signal recognition, and results presented for two call classifier scenarios.


Archive | 2002

Accent-based matching of a communicant with a call-center agent

Sharmistha Sarkar Das; Kenneth R. Hackbarth; Kenneth B. Jensen; Joylee E. Kohler; Valentine C. Matula; Richard A. Windhausen


Archive | 2003

Normalization of speech accent

Sharmistha Sarkar Das; Richard A. Windhausen


Archive | 2001

Call classifier using automatic speech recognition to separately process speech and tones

Michael Kenneth Brown; Norman C. Chan; Sharmistha Sarkar Das; David Joseph Skiba; Danny M. Wages


Archive | 2003

Detection of both voice and tones using Goertzel filters

Sharmistha Sarkar Das; Matthew Duane McShea


Archive | 2002

Arrangement for real-time automatic recognition of accented speech

Sharmistha Sarkar Das; Richard A. Windhausen


Archive | 2001

Call classification by automatic recognition of speech

Norman C. Chan; Sharmistha Sarkar Das; Douglas A. Spencer; Danny M. Wages


Archive | 2001

Unified call classifier for processing speech and tones as a single information stream

Micheal Kenneth Brown; Norman C. Chan; Sharmistha Sarkar Das; David Joseph Skiba; Danny M. Wages


Archive | 2002

Apparatus and method for unified tone detection

Sharmistha Sarkar Das; Manish Marwah


Archive | 2002

Apparatus and method for determining a minimal time bound for performing tone detection

Sharmistha Sarkar Das; Manish Marwah

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