數(shù)字信號(hào)處理緒論(2)-展示頁(yè)
2025-05-27 00:53本頁(yè)面
【正文】 處理？ why 可及模擬系統(tǒng)之所不能、抗干擾能力強(qiáng) Less sensitive to tolerances of ponent values ?模擬系統(tǒng)信號(hào)容易受干擾，產(chǎn)生失真； ?二進(jìn)制的數(shù)字信號(hào)在傳輸、存儲(chǔ)、處理中不容易丟失信息。 For example, in the digital processing of radar signals, the information extracted from the radar signal, such as the position of the aircraft and its speed, may simply printed on paper. There is no need for a D/A converter in this case. 7 數(shù)字信號(hào)處理的不足 系統(tǒng)復(fù)雜度相對(duì)高 Increased system plexity 可處理頻率范圍有限（ 10M Hz 字長(zhǎng) 12～ 16bits） Limited range of frequencies 功耗相對(duì)大 Consume electrical power 8 為什么選擇數(shù)字信號(hào)處理？ why 高精度 High fidelity (achieve any desirable accuracy by increasing the wordlength) ?模擬系統(tǒng)中高精度模擬元件、電路精度只能達(dá) 102～ 103 數(shù)字系統(tǒng)精度可達(dá) 103～ 105，甚至更高 ?模擬元器件的性能參數(shù)的容差范圍，導(dǎo)致精度控制非常困難，數(shù)字系統(tǒng)的精度控制由 A/D變換、字長(zhǎng)、浮點(diǎn)及定點(diǎn)算法等即可決定，相對(duì)容易得多 靈活 Easy adjustment (periodically change coefficients) ?模擬系統(tǒng)要改變系統(tǒng)特性一般要改變?cè)?、或改變電路連接，比較困難。 There is a need for an interface between the analog signal and the digital processor. This interface is called an analogtodigital (A/D) converter. The output of the A/D converter is a digital signal that is appropriate as an input to the digital processor. 6 為什么進(jìn)行 D/A變換 實(shí)際應(yīng)用中有些是做數(shù)據(jù)分析，只要分析出模擬信號(hào)中的信息成分即可，這時(shí)候數(shù)模轉(zhuǎn)換就不必要了 However, there are other practical apps involving signal analysis, where the desired information is conveyed in digital form and no D/A converter is required. 現(xiàn)實(shí)生活中看到、聽(tīng)到、感覺(jué)到，自然生成的信號(hào)一般為模擬信號(hào)，那么經(jīng)過(guò)數(shù)字處理的輸出信號(hào)在需要的時(shí)候也要有一
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