(hidden Markov model: HMM) FUNDAMENTALS OF SPEECH SYNTHESIS BASED ON HMM. Keiichi Tokuda. Department of Computer Science
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1 HMM (hidden Markov model: HMM) HMM HMM HMM HMM FUNDAMENTALS OF SPEECH SYNTHESIS BASED ON HMM Keiichi Tokuda Department of Computer Science Nagoya Institute of Technology Gokiso-cho, Shouwa-ku, Nagoya, Japan The increasing availability of large speech databases makes it possible to construct speech synthesis systems, which are referred to as corpus-based approach, by applying unit selection and statistical learning algorithms. In constructing such a system, the use of hidden Markov models (HMMs) has arisen largely. This paper aims to describe such approaches in relation to an approach in which synthetic speech is generated from HMMs themselves. speech synthesis, Text-to-Speech Translation, hidden Markov model, HMM, corpus
2 . (hidden Markov model: HMM) HMM [] [2] [3] tying / ( [4]) / ( [5], [6]) HMM speaker-driven, trainable ) HMM () ( [7]) (2) HMM HMM inventory ( [8], [9]). (3) HMM HMM instance ( [0], []) (4) HMM ( [2] [4]) (), (2), (3) HMM PSOLA [5] (4) vocoded speech HMM HMM HMM (4) HMM 2. HMM 3. HMM 4. HMM (HMM) 2. HMM HMM o t b i (o t ) a ij = P (q t = j q t = i) i, j o t MFCC [6], LPC HMM b i (o) =N (o µ i, U i ) { } = (2π)N U i exp 2 (o µ i) U i (o µ i ) () µ i U i b i (o) HMM N HMM λ π = {π i } N i= A = O: Q: a a22 a33 π a2 a23 b(ot) b2(ot) b3(ot) o o2 o3 o4 o5 ot (HMM)
3 2 3 4 i π a44 a34 b4(o 7) t T = 8 2 HMM {a ij } N i,j= i B = {b i( )} N i= λ =(A, B, π) Q = {q,q 2,...,q T } O =(o, o 2,..., o T ) T P (O, Q λ) = a qt q t b qt (o t ) (2) t= a q0i = π i O =(o, o 2,..., o T ) λ P (O λ) = P (O, Q λ) all Q P (O λ) O λ P (O λ) HMM k-means (embedded training) HMM HMM 2.3 I HMM λ,λ 2,...,λ I 2 O i max = arg max P (λ i O) i = arg max i P (O λ i )P (λ i ) P (O) P (O λ i ) (5) = all Q T a qt q t b qt (o t ) (3) t= (2) 2 (3) 2.2 HMM HMM λ O (3) P (O λ) λ λ max = arg max P (O λ) (4) λ EM Baum-Welch λ λ {O (), O (2),...,O (m) } HMM P (O λ i ) = P (O, Q λ i ) Q max P (O, Q λ i) (6) Q O λ P (O, Q λ) Q P (O, Q λ) Viterbi 2.4 g e N j i ts u 2
4 u-g+e g-e+n e-n+j N-j+i j-i+ts i-ts+u ts-u+o 3 [4] k- a+n t- a+n i- a+t Y N Y N Y N Y N HMM [7] [22] [23] HMM [24] 3. HMM 3. HMM [7] HMM 2.3 Viterbi O Q HMM HMM Viterbi HMM diphone, phone [25] [26] half-phone HMM [] 3 HMM 3.2
5 3 [27] ([28] ) inventory unseen (a) target cost, context matching score (b) (discontinuity, continuity cost, concatenation cost ) ([29], [28] ) (i) ([30], [28], [26] ) (ii) ([9], [], [3], [32], ) (i) (a) (b) DP (i) (ii) instance (b) DP 3 { } { } { } { } (ii) unseen (instance) DP (ii) HMM HMM ([9], [] ) [33], [34] 4. HMM 4. HMM HMM λ T O max = arg min P (O λ, T ) (7) O λ HMM HMM (6) O max = arg max P (O λ, T ) O arg max O max Q P (O, Q λ, T ) (8) P (O, Q λ, T )=P (O Q,λ,T)P (Q λ, T ) (9) Q P (Q λ) O (8) Q max = arg max P (Q λ, T ) (0) Q
6 O max = arg max O P (O Q max,λ) () (0) 4.2 () (2), () P (O Q,λ,T) log P (O Q,λ) = log T b qt (o t ) t= = 2 (O M) U (O M) log U 2 + Const (2) O = [o, o 2,...,o T ] (3) M = [µ q, µ q 2,..., µ q T ] (4) U = diag[u q, U q2,..., U qt ] (5) µ qt U qt q t (6) (7) P (O Q,λ) O = M [2] o t c t ( ) c t ( ) 2 c t ( ) o t =[c t, c t, 2 c t] c t 2 c t c t c t = 2 c t = L () + τ = L () L (2) + τ = L (2) w (τ)c t+τ (6) w 2 (τ) c t+τ (7) w (τ) w 2 (τ) (6), (7) O = WC (8) C =[c, c 2,...,c T ] (9) c t M C, O TM 3TM W 3TM TM,w (τ),w 2 (τ) 0 (8) P (O Q,λ) C log P (WC Q,λ) C = 0, (20) W U WC = W U M. (2) W U W TM TM (2) O(T 3 M 3 ) 4 W U W QR O(TM 3 L 2 ) 5 L = max{l (),L () +,L (2),L (2) + }. (2) [36], [37] [38]. (7) (8) [39] 4 [36] state 3 i state 2 state state 3 a state 2 state (khz) (a) (khz) (b) 4 sil, a, i, sil HMM (a) (b) 4 U q,i O(T 3 M) 5 U q,i O(TML 2 ) L () =, L () + =0,w(2) (i) 0 O(TM) [35]
7 4.2 HMM t = T i = K i d i p i (d i ) (0) P (Q λ, T ) log P (Q λ, T )= K log p i (d i ) (22) i= K i= d i = T HMM (2) p i (d) p i (d) = a ii a ii a d ii (23) p i (d) (0) Q max {d i } K i= d i = m i + ρ σi 2 (24) ( ) K / K ρ = T m i σi 2 (25) k= k= [40] m i σi 2 i T ρ (25) ρ T (25) ρ ρ =0 4.3 HMM HMM HMM HMM(MSD-HMM)[4] HMM HMM HMM [42] HMM HMM [27] HMM 3 I [43] [44] CTR [45] HMM (ii) HMM [9], [] (ii) HMM HMM HMM (ii) [46] 5. HMM HMM HMM HMM HMM
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