什麼是類比?

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什麼是類比?

類比或類比信號是用於表示物理測量的電信號。這種類型的信號與使用二進位代碼表示資訊的數位信號相反。類比信號是連續的,可以在給定範圍內取任何值。它們還用於數據機https://www.lenovo.com/us/en/glossary/what-is-modem/、聲卡和印表機等電腦硬體。

類比信號的優勢是什麼?

模擬信號的主要優點是精度高、成本低且易於使用。此外,類比信號不像數位信號那樣需要高水平的處理能力或昂貴的元件。這使得它們非常適合精度不重要但速度很重要的應用,例如視頻錄製或電視傳輸。

類比信號的缺點是什麼?

模擬信號的主要缺點是容易受到來自外部來源(如電動機、無線電波或雷擊)的干擾。此外,它們在存儲大量數據方面效率不高,因為每個單獨的值都必須單獨存儲。此外,由於如果沒有特殊設備,就無法輕鬆確定模擬信號的最大值和最小值,因此很難準確解釋這些信號。

計算機如何處理模擬信號?

過使用稱為「模數轉換器」(ADC)的專用硬體將其轉換為數位信號來處理模擬信號。該ADC將不同的電壓電平轉換為離散數位,然後可由計算機的CPU和GPU晶元處理。通常,這種轉換以指定的頻率和解析度進行,以獲得最佳結果。

為什麼數位數據優於模擬數據?

與模擬數據相比,數字數據具有幾個優勢,包括更高的保真度(即更高的品質),更好的存儲容量(例如MP3檔比CD小得多),互聯網等網路上更快的傳送速率,更高的抗雜訊干擾能力以及數位技術提供的更安全的數據加密方法。由於這些原因,許多應用已經放棄使用模擬技術,轉而盡可能使用數字解決方案。

什麼是模數轉換 (ADC)?

模數轉換(ADC)是將類比電信號轉換為數位信號https://www.lenovo.com/us/en/desktops的過程,以便電腦或其他數位設備(如智慧手機和平板電腦)可以對其進行處理。在此過程中,類比波形將經歷一些階段,在這些階段中,它通常會通過調理電路,然後到達積分器,積分器將其資訊相加,直到到達某個點,然後它將觸發下一階段的信號,這可能涉及進一步的調理電路或傳遞到實際ADC器件本身進行進一步的轉換過程,然後準備供最終目標器件/應用使用。

為什麼在將類比信號轉換為數位信號時使用採樣?

採樣是指將類比信號轉換為數位信號時使用的過程,該過程涉及在其週期內定期從輸入波形中獲取多個讀數,稱為採樣點。因此,形成樣本,為我們分別代表類比輸入波形在這些特定時間點的幅度的離散值,有助於在獲取足夠量後將所有採樣值收斂在一起(採樣)后創建準確的近似值。

量化如何計入模數轉換?

量化可以最好地描述為將連續數據範圍劃分為不同的段,其中每個段(“桶”)在其範圍內包含其自己獨特的值集,允許以數位形式表示它們,從而在模擬域和數位域之間成功轉換過程,同時還有助於減少整體結果檔大小,因為其中顯著減少;最終導致在處理上述通信模式時提高效率和便利性,特別是通過網路連接/網路。

在計算機硬體中使用ADC技術的設備有哪些範例?

ADC技術通常用於各種類型的計算機硬體,從數據機和聲卡到印表機,甚至在嵌入式系統和智慧手機和平板電腦等消費電子產品中也是如此,在採樣和轉換來自物理世界/環境的各種類型的輸入時,提供無與倫比的精度,通過我們的計算骨幹網的能力,使原本不可能的事情變得可行。

類比信號和數位信號有什麼區別?

類比信號和數位信號之間的主要區別在於它們的表示方式。模擬信號本質上是電信號,因此它們在給定範圍內具有任何值,並且很容易被人類解釋。另一方面,數位信號本質上是二進位的,由一和零組成,需要專門的硬體來轉換為人類可以理解的資訊。

如何將類比信號用作計算機的輸入?

通過使用ADC或「模數轉換器」,類比信號可用作計算機的輸入。該設備將類比信號作為輸入,並將其轉換為數位信號,然後計算機的CPU或GPU晶元可以讀取該信號以進行進一步處理。

在計算機硬體中使用ADC技術的設備有哪些範例?

ADC技術通常用於各種類型的計算機硬體,從數據機和聲卡到印表機,甚至在嵌入式系統和智慧手機和平板電腦等消費電子產品中,在採樣和轉換來自物理世界/環境的各種類型的輸入時,也提供了無與倫比的精度,通過我們的計算骨幹網的能力,使原本不可能的事情變得可行。

哪個更有效:類比信號還是數字信號?

在效率方面,數字信號通常勝過類比信號,因為它們能夠以更少的元件存儲大量數據,並且能夠抵抗雜訊干擾。此外,數字信號不需要像模擬信號那樣的高處理能力或昂貴的元件,這使得它們在許多應用中更具成本效益。

為什麼類比電路在收音機和計算機中如此普遍?

類比電路在無線電中很受歡迎,因為與數位電路相比,它們允許更準確地傳輸音訊。在計算機中,類比電路仍然廣泛用於控制電機或測量溫度等任務,因為這些過程需要比數字設備以更低的成本實現的更高的精度。

類比信號在計算之外有哪些用途?

除了用於計算之外,類比信號還因其魯棒性、可靠性和與數字解決方案相比相對較低的成本而在整個行業中得到廣泛應用。一個例子是汽車應用,例如感測器測量壓力、溫度和流量的發動機管理系統。在將類比信號發送回ECU(電子控制單元)進行進一步處理和決策之前。

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