Signal processing for handling singing voice texture
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- Ἁλκυόνη Ασπάσιος
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1 1 TANDEM-STRAIGHT Signal processing for handling singing voice texture Hideki Kawahara 1 Singers explore vocal expressions to the limit. Conventional speech processing algorithms, which were designed to handle usual conversational speech and read speech, where voiced sounds are usually quasi periodic, are not capable of flexible and versatile manipulation of such extreme expressions as shout, for example. This article discusses various signal processing approaches for handling singing voice texture, referring recent investigations for extending TANDEM-STRAIGHT as an example testbet. 1. 1),2) 1 1 Wakayama University 1 3) 2 4) 6) TANDEM-STRAIGHT 7) 8) 2. 9),10) 11) TANDEM-STRAIGHT 3. TANDEM-STRAIGHT TANDEM-STRAIGHT STRAIGHT 12),13) 14) 15) x << c 2012 Information Processing Society of Japan
2 log(1 + x) x cepstrum liftering 16),17) P ST (ω) = exp (F [g 1(q)g 2(q)C T (q)]), (1) P ST (ω) C T (q) P T (ω) cepstrum q quefrency. F[ ] Fourier lifterg 1(q) g 2(q) g 1 (q) = α α 1 cos (2πqf 0 ), (2) g 2 (q) = sin(πf0q), πf 0q (3) f 0 g 2(q) f 0 g 1(q) consistent sampling 15) α 0 = 1.18, α 1 = ) 3.1 TANDEM-STRAIGHT VOCODER 18) VOCODER 19) P ST (ω, t) 20) x S (t) N ( t ) x S(t) = a k (t) sin ω k (λ)dλ + ϕ k (t) k=1 N ω k (t) = 2πf k (t) k 1 1 (DVD ) 21) 0 (4) f 0(t) k ϕ k (t) k a k (t) k 2 a k (t) = P ST (kω 0(t), t)/ω 0 (5) ) 3 23) 26),27) 28) 2 22) TANDEM-STRAIGHT 3 Titze NCSV (National Center for Voice & Speech) 24) vocologist ) 2 c 2012 Information Processing Society of Japan
3 29) 1 28) ),31) Schroeder 32) 3 1 DVD 21) 2 50 ms 100 ms 3 kawahara/phaseeffect/ 20 db 33) SNR 20 db 5. STRAIGHT TANDEM-STRAIGHT 1) 2) 3) 4) 5) TANDEM 7) XSX (excitation Structure extractor) XSX YIN 34) SWIPE 35) 36) c 2012 Information Processing Society of Japan
4 37) 38) 60 db 60 db -90 db -18 db/oct cos 39) 40) TANDEM 5.2 XSX 1 XSX XSX 41) 36) ),19),42),43) ) TANDEM-STRAIGHT sigmoid 44) TANDEM-STRAIGHT ) Hilbert TANDEM-STRAIGHT 5.5?),46) 6. 4 c 2012 Information Processing Society of Japan
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