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題 名 | Reduction of Intermodulation Beat Products Using a Subband Amplifying Structure in CATV Network=利用次頻帶放大器改善有線電視網路之互調拍差 |
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作 者 | 洪盟峰; | 書刊名 | 高苑學報 |
卷 期 | 5:1 1996.02[民85.02] |
頁 次 | 頁71-77 |
分類號 | 448.5 |
關鍵詞 | 有線電視網路; 次頻帶放大架構; 二次合成拍差; 三次合成拍差; CATV network; Subband amplifying structure; Composite second order; Composite triple beat; |
語 文 | 英文(English) |
中文摘要 | 本文提出一個新的有線電視放大器架構,利用頻帶分割、次頻帶放大濾波的方 式以濾除有線電視網路內的互調拍差;例如二次及三次拍差。互調拍差一般將造成網 路傳輸線內信號失真,嚴重影響電視畫面品質並將限制有線電視網路的服務範圍。在 本文中,將分析互調拍差的影響並利用適當的頻帶分割將現行系統頻帶分為四個次頻 帶,可推論得知放大器產生的二次諧波及三次諧波可用帶通濾波器予以濾除。在實驗 模擬的結果中,可以發現,因放大器的非線性引起的二次諧波及三次諧波成份確能有 效降低,大幅改善放大器之如 CSO 與 CTB 等性能參數。 |
英文摘要 | A new amplifier structure for cable television transmission network (CATV) is proposed. In this paper, we develop a subband amplifying structure using frequency division, subband amplifying and filtering to reduce the annoying intermodulation beat products. The intermodulation beat products are the serious impairments which affect the picture quality of cable television and limit the service area of cable distribution network. This subband structure removes efficiently the harmonics of second and third oder and improves practically composite second order (CSO) and the composite triple beat (CTB) of calbe distribution system. The paper will give an analysis of intermodulation beat products, develop a subband division and a amplifying structure. The simulation results are also presented at final. This paper is organized as followed: introduction, analysis of intermodulation beat products, subband amplifying structure, simulation and conclusion. |
本系統中英文摘要資訊取自各篇刊載內容。