DocumentCode :
3428042
Title :
FPGA based fast Lithuanian isolated word recognition system
Author :
Sledevic, Tomyslav ; Navakauskas, Dalius
Author_Institution :
Dept. of Electron. Syst., Vilnius Gediminas Tech. Univ., Vilnius, Lithuania
fYear :
2013
fDate :
1-4 July 2013
Firstpage :
1630
Lastpage :
1636
Abstract :
The article presents the Lithuanian isolated word recognition system implementation in a FPGA hard-core. The pursued objective is the acceleration of the previous soft-core implementation at both key stages: feature extraction and recognition. The 12-th order cepstral analysis is used to extract speech signal features, while for isolated word recognition a dynamic time warping is used. Implementation completely done in the VHDL hard-core allowed us to 320 times speed-up the signal cepstrum calculation and 348 times - one dynamic time warping comparison with border constraints. The recognition system works in real time and is built on medium class FPGA, operating at 50 MHz main clock frequency. It is tested on 6 times repeated 100 Lithuanian words dictionary. Speaker dependent recognition tests done for 10 speakers yield the 97.7 % average recognition accuracy (with 4.9 % recognition improvement over the previous implementation).
Keywords :
feature extraction; field programmable gate arrays; hardware description languages; natural language processing; speech recognition; speech recognition equipment; FPGA; Lithuanian isolated word recognition system; Lithuanian words dictionary; VHDL hard core; cepstral analysis; dynamic time warping; feature extraction; signal cepstrum calculation spee-up; soft core implementation; speaker dependent recognition; speech signal feature; Cepstrum; Dictionaries; Feature extraction; Field programmable gate arrays; Real-time systems; Speech; Speech recognition; DTW; FPGA; Word recognition; cepstrum;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
EUROCON, 2013 IEEE
Conference_Location :
Zagreb
Print_ISBN :
978-1-4673-2230-0
Type :
conf
DOI :
10.1109/EUROCON.2013.6625195
Filename :
6625195
Link To Document :
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