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            數字對講機較模擬對講機的優點

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            行業新聞
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            來源:
            2018/01/03 11:32
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                    無線電對講機在設計技術方面,可分為模擬通信技術的模擬對講機(也就是我們常見的傳統對講機)以及采用數字技術進行設計的數字對講機。模擬對講機是將儲存的信號調制到對講機傳輸頻率上,而數字對講機則是將語音信息數字化,以數字編碼形式傳播,也就是對講機傳輸頻率上的全部調制為數字。數字對講機具有語音抗干攏能力強、語音清晰、保密性高、信道占有帶寬更窄、傳輸數據能力更強等顯著優點。
                    一、傳統的模擬對講機是將語音、信令、信號以連續波方式調制到對講機載頻上并經過放大等優化處理的一種通訊模式,具有技術成熟、系統完善、成本相對低等優點。
                    二、數字對講機是將語音信號數字化,以特定的數字編碼方式和特定的基帶調制形式,并采用數字信號處理器進行優化的數據化通訊模式。 首先,可以更好地利用頻譜資源。與蜂窩數字技術相似,數字對講機可以在一條指定的信道上裝載更多用戶,提高頻譜利用率,這是一種解決頻率擁擠的方案。其次,提高通話質量。由于數字通信技術擁有系統內錯誤校正功能,和模擬對講機相比,可以在一個范圍更廣泛的信號環境中,實現更好的語音音頻質量,其接收到的音頻噪音會更少些,聲音也更清晰。
                    第三,提高、改進語音和數據集成,改變控制信號隨通訊距離增加而降低的弱點。與類似集成模擬的語音及數據系統相比,數字對講機可以提供更好的數據處理及界面功能,從而使更多的數據應用可以被集成到用一個雙向無線通信基站結構中,對語音和數據服務集成更完善,更方便。 隨著無線電通信技術的發展,人們對無線通信質量要求的提高以及頻譜資源的日益缺乏,數字對講機必將有巨大的市場需求。目前,在國內的數字對講機的需求也在不斷增加。

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