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              深圳市金維通訊技術有限公司
              電話交換機程控電話交換機威譜電話交換機國威電話交換機...網點分布:深圳 廣州 中山 佛山 珠海 惠州

              電話程控數字交換機“模擬”和“數字”電話交換機的區別


                所謂“模。以用于計時的鐘表為例,指針式鐘表是以指針的連續走動指示時間,所以它是一種“模擬”方式;相反,數字式鐘表每隔一定時間跳一個數,擬”,是指把某一個量用與它相對應的連續的物理量來表示;所謂“數字”,是指把某一個量用與它相當的離散的(不連續的)數字來表示是一種非連續計時方式,即“數字”方式。 
              電信是用電信號進行遠距離傳遞信息的過程。這個過程的主要內容就是首先要把信息轉變成電信號,然后再通過有線或無線方式傳送出去。電信號有兩種不同的類型,一種叫做“模擬信號”,另一種叫做“數字信號”。

                什么叫“模擬信號”?以電話為例加以說明。在電話通信中,傳送的信息是發話人(信源)的聲音。聲音是由振動發出的。聲波通過送話器(變換器)轉變成跟隨聲音的強弱變化而變化的電信號,由于該信號是“模擬”聲音變化的,因此叫做“模擬信號”。這個模擬信號通過線路(信道)傳送到對方,再通過受話器(反變換器)轉變為原來的聲音,為受話人(信宿)所聽到。
                模擬信號的特點是它連續地“模擬”著信息的變化,信號的波形在時間上是連續的,所以又可稱之為“連續信號”。原始的電話、傳真、電視的信號都是模擬信號。用模擬信號傳送信息的通信叫做“模擬通信”。

                “數字信號”是什么?這可以用電報通信為例來說明。早期的莫爾斯電報,其電報信號是用“點”和“劃”組成的電碼(叫做莫爾斯電碼)來代表文字和數字。如果用有電流代表“1”、無電流代表“0”,那么“點”就是1、0,“劃”就是1、1、1、0。莫爾斯電碼是用一點一劃代表A,用一劃三點代表B,所以A就是101110,B就是1110101010……。

                數字信號是數字形式的信號,它的特點是離散的、不連續的。用數字信號傳送信息的通信就叫做數字通信,現代電子計算機輸入、輸出的信號以及它所處理的信號都是離散信號,是速率非常高的數字信號。所以計算機之間的通信也是數字通信。

                數字通信可以傳送符號、數字、數據等數字信號。也可以傳送經數字化處理后的話音、圖像等模擬信號。模擬信號轉變為數字信號的過程叫做“模數變換”; 相反,數字信號轉變為模擬信號的過程稱“數模變換”。
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