EE5410 Signal Processing -- What is the unit impulse response h[n]?

EE5410 What is the unit impulse response h[n]?

excerpted from Signal Processing First, ch.5.
1. When the input to the FIR filter is a unit impulse sequence, ie., x[n] = delta[n], the output is, by definition, the unit impulse response, or simply the impulse response h[n].

2. When the relation between the input and the output of the FIR filter is expressed in terms of the input ( x[n] ) and the impulse response ( h[n] ), it is called a finite convolution sum, and we say that the output is obtained by convolving the sequences x[n] and h[n].

3. For example, a term such as x[n-2] is the x[n] signal with its values shifed two places to the right ( 整條 signal x[n] 位移 2 格 ).

The multiplier h[2] SCALES the shifted signal x[n-2] to produce the contribution h[2]x[n-2].

陳雲 - 九評地產黨 序言 : 反對壟斷 對抗複製
http://hkreporter.com/talks/thread-1073853-1-1.html

地產霸權腐化香港的政治，敗壞香港的公德，吞噬老百姓的畢生儲蓄和閒暇享受，破壞小企業主的生計，毀滅窮人安身的舊區，蹂躪農民棲息的鄉土，掃蕩坊眾聚腳的街道，圈禁民眾聯誼活動的範圍，殺害野外生物。

二十世紀八十年代後期逐漸成形的地產霸權，是虐殺香港公共生活、葬送香港共同前途的大兇手。香港地產財閥，罪行滔天，惡貫滿盈，是要打落地獄的一群妖魔鬼怪。