導盲機器人之研製---子計畫III：導盲機器人之聽覺系統與人機溝通介面研製(I)

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(25) M _TD C matrix M_T D C(v,n) n 20. fr a m e w i nd o w ( 2 5 m s ). n Take su bmatrix 10. fs : 1 6 k H z. 1 f ra m e p e ri o d( 1 5 m s ). P reem p has is − . . 1 0. −. 32. v. Index 0 - [0000000] Index 1 - [0000001] Index 2 - [0000010]. H a m m in g W indo w. M _TDC (0, 1) =>0 M _TDC (0, 2) =>1 M _TDC (0, 3) =>2. Encode index in to b in ary code. Index 117 - [1110101] Index 118 - [1110110] Index 119 - [1110111]. DF T. v 11 A ss ign in dex. 0. M _TDC (11, 8) =>117 M _TDC (11, 9) =>118 M _TDC (11, 10) = >119. an individ ual (a chrom oso me) rep resents a set of p ositions f or 30 parameters fo r s peech r eco gnition.. F ilter B an d 1. individual 1. F il ter B a nd 2 0. pa rame t er 1 pa ra me te r 2. pa rame te r m-1. para met e r m. pa ra me te r m-1. para met er m. individual i. õ î èz ^_à 45çëì î &õ*. pa rame te r 1 para met e r 2. m =30 i=3 0. fram e w indo w( 25ms ). õ ý/;ST0qsHçöuõ* •Using Step1 to Step3 pr ocedur es to generate MFC coeffici ents. f s:16 kH z S peech data. M _TD C featur e extraction. G au ss ian R ecog nititio n clas sif ier Rate B eg in. MFC coefficien ts. C reate a po pulation of N indiv iduals. GA alg orithm. D etermine the fitnes s value of each in dividu al bas ed on the s peech recog nition rate. •G ather these c oe ff icie nts int o a M FC- tim e m a trix •Tak e ID FT o peration alo ng this direction. R epro du ctio n. MFC. •Take real- part coefficients. C ros s over M u tatio n. time. .. G eneration > M ax No Y es Exit. õ Þ/HHIJKE+234;S T{|yzçëìÏ5õ* . M_ TD C m at rix. õ ð èz ^_à 45çëì Þ &õ*. õ $ ;56 å? * 4.

(26) Cock pit noise 100. recognition accuracy, %. 80. 60. 40 - o - :G A-based M_TDC - + -:HMM - * -:TDC. 20. 0 0. 10. 20 30 40 signal-to-noise r atio, dB. 50. õ %/+ÏÐÈ>ç56Å~Ä`¾* õ Ö ;56å?y@ . De stroy e r ope ratio ns roo m no ise. recognit ion accuracy, %. 1 00. 80. 60. 40. 20. 0. - o -: GA-ba sed M_TDC - + -:HMM - * -:TDC 0. 10. 20 30 40 sign al-t o-no ise rat io, dB. 50. õ îñ/+ÉÊËÈ>ç56Å~Ä`¾*. õ ( ;5656`¾ . Noise on the floor of car factory 100. Voice babble noise 100. recognition accur acy, %. 80 recognition accur acy, %. 80. 60. 40 - o -:G A- based M _TDC - + - :HMM - * -:TDC. 60. 40. 20. - o - :GA-based M_TDC - + -:HM M - * - :TDC. 20. 0 0. 0 0. 10. 20 30 40 signal-to-noise r atio, dB. 50. 10. 20 30 40 signal-to-noise ratio, dB. 50. õ îî/+ÌÎÈ>ç56Å~Ä`¾*. õ Ô/+ÆÈ>ç56Å~Ä` ¾* . 5.

(27) White noise. r ecognition accuracy, %. 100. 80. 60. 40. 20. 0 0. - o - :G A-based M_TD C - + - :HMM - * -:TDC 10. 20 30 40 signal- to- noise ratio, dB. 50. õ îð/+ÑÒ34op¤ç56Å~Ä `¾*. 6.

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