DIGITAL MODULATION SYNTHESIZER
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专利名称：DIGITAL MODULATION SYNTHESIZER 发明人：VILCOCQ, GUILLAUME,BRUN, CORINNE 申请号：EP01938325.6
申请日：20010523
公开号：EP1290783B1
公开日：
20040303
专利内容由知识产权出版社提供
摘要：The invention concerns a digital modulation synthesizer for generating an output frequency or phase modulated radiofrequency signal (SOUT), comprising a pre-accentuation filter (18) receiving a frequency modulation digital signal (Fmod) in input to produce a pre-accentuated frequency modulation signal (F'mod), a modulator Σ-Δ (15) having an input receiving the pre-accentuated frequency modulation signal (F'mod), and an output delivering a pre-accentuated and scrambled frequency modulation signal (SC), a phase locked loop (PLL) with variable radio frequency divider (14) in the feedback path, the filtering by the phase locked loop (PLL) enabling to filter the quantizing distortion introduced by the modulator Σ-Δ (15) and the pre-accentuation filter (18) applying a pre-accentuation to the frequency modulation signal (Fmod) enabling to compensate the effect of said filtering on the modulation inside a usful band, means for automatic calibration of the pre-accentuation filter (18) enabling further to adjust the pre-accentuation filter (18) function to that of the PLL.
申请人：NORTEL NETWORKS FRANCE,NORTEL NETWORKS FRANCE,NORTEL NETWORKS FRANCE
地址：FR
国籍：FR
代理机构：Verdure, Stéphane 更多信息请下载全文后查看。