●●● ●●●● ●●●●● ●●●● ●●●●● Speech Recognition Engine ●●●● Acoustic models Input signal Language model 515253 P(xx ↓x o pyx) Feature extraction p(zx) Ao p(xly lyly) p(zy) Lexicon p(×2) ba=b同a p(y2) p(z2) 卹p=团l arch-engine W= argmax f(ylw,)P(w) y151) Recognised word sequence Extraction TechniquesSpeech Recognition Engine Extraction Techniques