x[]=x() EXAMPLE Sampling the analog waveform 32 a Figure 2.2 256 samples
6 Figure 2.2 EXAMPLE Sampling the analog waveform x[n] x (t)| x (nT) = a t=nT = a
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7 Display the wav speech signal in ULTRAEDIT
Display the way speech signal in COoLEDit 网 y“y心vE 国画回网幽四国哪醒画國国 回回回百四四圆四回画国国四四回回 The whole waveform O.9 毆圆0:00.357 Favorit口 ption=置 i ndow H1p 原國幽时四冖醒Fxl 国■ local Blowup 曰毆O:00.249m1
8 The whole waveform local Blowup Display the wav speech signal in COOLEDIT Display the wav speech signal in
2.1.2 Classification of sequence Right-side x[n]=0, for -o<n<N eft-side xn]=0,forN<n≤+∞ WO-SIde xn]≠0,for-∞0<n<+∞ Finite-length x[n]=0, outside of m1≤n≤N2 Causal xn=0, for n<0 Noncausal xn]≠0,orn<0
9 2.1.2 Classification of sequence Right-side x[n] = 0, for − n N x[n] = 0, for N n + x n for n [ ] 0, − +1 2 x[n] = 0,outsideof N n N x[n] = 0, for n 0 x[n] 0, for n 0 Left-side Two-side Finite-length Noncausal Causal
2.1.3 Basic sequences I Unit sample sequence 0 H≠0 n 2. The unit step sequence ≥0 0n<0 3. The rectangular sequence RIn 0≤n<N-1 other N-1 n
10 1. Unit sample sequence 2.1.3 Basic sequences 2．The unit step sequence 0 0 0 1 [ ] = = n n n 0 0 0 1 [ ] = n n u n 1 u[n] 0 n 1 δ[n] 0 n 3．The rectangular sequence 1 R[n] 0 N-1 n other n N R n N 0 1 0 1 [ ] − =