The The Fixed-Point nt Fixed-Point Optimization ation Optimization of Mel Mel Frequency equen cy Frequency Cepstrum m Cepstrum Coefficients ents Coefficients for for Speech ch Sp eech Speech Recognition on Recognition
Ge Zhang, Jinghua Yin, Qian Liu, Chao Yang · 2011
Abstract— Speech eech Speech recognition tion recognition is a a computationally puta tionally computationally complexity ity complexity process rocess process and it i t it is suitable uit abl e suitable for battery ttery b attery battery powered owered powered devices d evices devices like ike mobile bile mobile phones ones phones and other her oth er other personal l personal PDAs. PDA s. PDAs. Particularly larly Particularly the parts rts par ts parts of mel- el- m el- scaled aled scaled frequency cy frequency cepstrum m cepstrum coefficients ients coefficients coefficients ( MFCCs) CCs) MFCCs) are are a process rocess p rocess process of dime nsion dimensi on dimension reduction on reduction for reducing ducin g reducing resources es resources to to accurately rat ely accurately describe e describe speech eech speech samples. . samples. The optimized timiz ed optimized algorithm hm algorithm was applied plied a pplied applied to to a bin ary-search-based binary- search-based binary-search-based binary-search-based look ook-- up table e tab le table to take ake t ake place ce place of original ina l original Taylor ylor Taylor expansion on expansion expansion algorithm, hm, algorithm, and it t it reduce ce re duce reduced d the time me time ime of execution uti on execution frames ames frames to to meet eet m eet real-time me real-time speech eech speech recognition tion recognition system.ystem. system. The The look-up ok-up look-up look-up tables bles tables were ere established shed established by by analysing ysi ng analysing the pseudo eudo ps eudo pseudo code ode to to reduce ce re duce reduce the memory mory me mory memory size ize in this his t his paper. per. paper. The transition ansit ion transition algorithm hm algorithm of floa ting-point floatin g-point floating-point MFCCs MFC Cs MFCCs to fixed-point d-p oint fixed-point one ones was as was investigated vesti gated investigated to to reac h reach