A Gaussian probability accelerator for SPHINX 3

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Publication Type technical report
School or College College of Engineering
Department Computing, School of
Program Advanced Research Projects Agency
Creator Mathew, Binu K.; Davis, Al; Fang, Zhen
Title A Gaussian probability accelerator for SPHINX 3
Date 2003-07-22
Description Accurate real-time speech recognition is not currently possible in the mobile embedded space where the need for natural voice interfaces is clearly important. The continuous nature of speech recognition coupled with an inherently large working set creates significant cache interference with other processes. Hence real-time recognition is problematic even on high-performance general-purpose platforms. This paper provides a detailed analysis of CMU?s latest speech recognizer (Sphinx 3.2), identifies three distinct processing phases, and quantifies the architectural requirements for each phase. Several optimizations are then described which expose parallelism and drastically reduce the bandwidth and power requirements for real-time recognition. A special-purpose accelerator for the dominant Gaussian probability phase is developed for a 0.25 CMOS process which is then analyzed and compared with Sphinx?s measured energy and performance on a 0.13 2.4 GHz Pentium4 system. The results show an improvement in power consumption by a factor of 29 at equivalent processing throughput. However after normalizing for process, the specialpurpose approach has twice the throughput, and consumes 104 times less energy than the general-purpose accelerator. The energy-delay product is a better comparison metric due to the inherent design trade-offs between energy consumption and performance. The energydelay product of the special-purpose approach is 196 times better than the Pentium4. These results provide strong evidence that real-time large vocabulary speech recognition can be done within a power budget commensurate with embedded processing using today?s technology.
Type Text
Publisher University of Utah
Subject Speech recognition; SPHINX 3; Speech recognizers
Subject LCSH Automatic speech recognition
Language eng
Bibliographic Citation Mathew, Binu K.; Davis, Al; Fang, Zhen (2003). A Gaussian probability accelerator for SPHINX 3. UUCS-03.002.
Series University of Utah Computer Science Technical Report
Relation is Part of ARPANET
Rights Management ©University of Utah
Format Medium application/pdf
Format Extent 131,996 bytes
Source University of Utah School of Computing
ARK ark:/87278/s6z03sg4
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2015-04-22
ID 704380
Reference URL https://collections.lib.utah.edu/ark:/87278/s6z03sg4
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