福州卓凱電子科技有限公司

A57L-0001-0037

4864701BBA

A57L-0001-0037

Fu Zhou ZhuoKai  Electric Co., Ltd.

1.邏輯常量與變量：邏輯常量只有兩個，即0和1，用來表示兩個對立的邏輯狀態(tài)。邏輯變量與普通代數(shù)一樣，也可以用字母、符號、數(shù)字及其組合來表示，但它們之間有著本質(zhì)區(qū)別，因為邏輯變量的取值只有兩個，即0和1，而沒有中間值。

　　2.邏輯運算：在邏輯代數(shù)中，有與、或、非三種基本邏輯運算。表示邏輯運算的方法有多種，如語句描述、邏輯代數(shù)式、真值表、卡諾圖等。

　　3.邏輯函數(shù)：邏輯函數(shù)是由邏輯變量、常量通過運算符連接起來的代數(shù)式。同樣，邏輯函數(shù)也可以用表格和圖形的形式表示。

　　4.邏輯代數(shù)：邏輯代數(shù)是研究邏輯函數(shù)運算和化簡的一種數(shù)學(xué)系統(tǒng)。邏輯函數(shù)的運算和化簡是數(shù)字電路課程的基礎(chǔ)，也是數(shù)字電路分析和設(shè)計的關(guān)鍵。

式中小圓點“·”表示A、B 的與運算，又稱邏輯乘。在不致引起混淆的前提下，乘號“·”被省略。某些文獻中，也有用符號 ∧、∩表示與運算的。

　　真值表：如果開關(guān)不通和燈不亮均用0表示，而開關(guān)接通和燈亮均用1表示，得到如圖1（c）所示的真值表描述。真值表的左邊列出為所有變量的全部取值組合，右邊列出的是對應(yīng)于A，B變量的每種取值組合的輸出。因為輸入變量有兩個，所以取值組合有22＝4種，對于n個變量，應(yīng)該有2n種取值組合。

福州卓凱電子科技有限公司

【誠信】 【質(zhì)量保證】  【價格優(yōu)惠】   

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