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題 名 | 有線電視系統用戶終端信號品質查驗工程之單一波道載波雜訊比參數量測=Measurement of the In-Channel CNR Parameter for CATV Signal Quality Inspection at the Subscriber Point |
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作 者 | 洪鴻文; | 書刊名 | 技術學刊 |
卷 期 | 15:2 2000.06[民89.06] |
頁 次 | 頁299-306 |
分類號 | 448.88 |
關鍵詞 | 帶通濾波器; 前置放大器; 單一波道載波雜訊比; 雜訊位準相近; 不聯接試驗; Band-pass filter 4aPre-amplifier; In-channel carrier-to-noise ratio; CNR; Noise-near-noise; Disconnect test; |
語 文 | 中文(Chinese) |
中文摘要 | 本文針對現行有線電視系統用戶終端信號品質查驗工程中單一波道載波雜訊比參數之查測,因待測網路系統雜訊與查測用頻譜分析儀內背景雜訊間彼此位準相近時,易造成查測結果誤差過大甚至發生查測錯誤之困擾,提出討論與解決問題之方法。另外在單一波道載波雜訊比查測架構中之帶通濾波器、可變衰減器與前置放大器這三項裝置並非任何查測情況均可加入適用,針對正確而適當之使用時機與程序提出說明並探討不適用查測情況下但加入這三項裝置時之不良影響。本文提出查測CNR參數前必須先重複作不聯接試驗,再依雜訊位準差值作判定後,或逕行查測CNR參數不必開前置放大器也不必修正測得讀值,或需修正測得CNR參數讀值,或需先開前置放大再查測CNR參數。 |
英文摘要 | In this paper, we deal with the measurement of the in-channel carrier-to-noise ratio (CNR) parameter for signal quality inspection at the subscriber’s point of a cable television (CATV) system. When both noise levels of the employed spectrum analyzer and the CATV system are nearly the same, this situation introduces significant error in measuring the CNR parameter an even gives erroneous results. To solve the above problem, a novel measurement procedure is proposed. Moreover, the applicability and influence of bandpass filters, adjustable attenuators and pre-amplifiers in implementing a measurement architecture for the in-channel CNR parameter are also discussed. In our method, a disconnect test is first accomplished before of measuring the CNR parameter. Thus, the difference of noise levels can be approximately estimated. Based upon this noise difference, the subsequent measurement procedure can be adequately determined, i.e., direct measurement, correcting the readings of the CNR parameter after measurement or activating the pre-amplifier in a spectrum analyzer before measurement. Experimental results demonstrate the proposed method can efficiently improve the accuracy in measuring the CNR parameter of a CATV system. |
本系統中英文摘要資訊取自各篇刊載內容。