o Those behind the answer . Turning on/off Switch A and Turning on Switch B in room I is a feature extraction procedure andstatus checking in room 2 a feature selection and recognition Feature vector=(hot, bright)' Feature selecting vector: W=(Wn, wb), where wh, W E(0, 1) A hierarchical feature selecting procedure Step 1:W=(0,1)r(“ Bright” component) to tell” from others(“A”&“C”) Step2:W=(1,0)r(“ Hot component) to tell " a”fom“C” Dr alternatively O Step 1:W=(1,0) to tell"a”fomB”l&“C” Step 2: W=(0, 1) to tell"B from"C Center of speech Technology, Tsinghua University Slide 12Center of Speech Technology, Tsinghua University Slide 12 ❑ Those Behind the Answer ❖ “Turning on/off Switch A and Turning on Switch B in Room 1” is a feature extraction procedure; and “status checking in Room 2” a feature selection and recognition. ❖ Feature vector = (hot, bright) T . ❖ Feature selecting vector: W=(wh , wb ) T , where wh , wb  {0, 1} ❖ A hierarchical feature selecting procedure ▪ Step 1: W=(0,1)T (“Bright” component) to tell “B” from others (“A” & “C”) ▪ Step 2: W=(1,0)T ( “Hot” component) to tell “A” from “C” ➢ Or alternatively ▪ Step 1: W=(1,0)T to tell “A” from “B” & “C” ▪ Step 2: W=(0,1)T to tell “B” from “C