Speech recognition idea using 4 linear filters each bandwidth is 2, 5KHz Two sounds with two spectral Envelopes sear seoi,e.g spectra Envelop(se)"ar", Spectral envelop"ei Spectral envelope sear=ar Spectral envelope seei=ei energy energy eq 0 reg 10KHz filter 1 2 3 4 filter 1 2 3 4 10KHz Filter 2V3V4 Filter out W1 W2 3W4 out Feature extraction, v gaSpeech recognition idea using 4 linear filters, each bandwidth is 2.5KHz • Two sounds with two Spectral Envelopes SEar,SEei ,E.g. Spectral Envelop (SE) “ar”, Spectral envelop “ei” Feature extraction, v.9a 4 Spectral envelope SEar=“ar” energy energy Freq. Freq. Spectrum A Spectrum B filter 1 2 3 4 filter 1 2 3 4 v1 v2 v3 v4 w1 w2 w3 w4 Spectral envelope SEei=“ei” Filter out Filter out 10KHz 10KHz 0 0