Modulation method and modulator for digital signal

专利名称：Modulation method and modulator for

digital signal

发明人：Pikkarainen, Juha,Kontas, Veijo申请号：EP96108310.2申请日：19960524公开号：EP0748092A3公开日：20001108

专利附图：

摘要：The invention is related to a method and modulator for modulating a digitalsignal to an analog intermediate-frequency signal. A baseband digital signal (I, Q) is takento a digital-to-analog converter (71, 710) in which it is sampled at a certain sampling

frequency (f) and converted to an analog signal. The conversion produces a basebandsignal (f) and signals (N*f, f) at multiples of the sampling frequency (f). The samplingfrequency is increased, advantageously according to a sigma-delta D/A conversion, andone of the signals (N*f, f) at multiples of the sampling frequency (f), produced by theconversion, is selected as the output signal (f), advantageously a multiple (N*f, f) of thesampling frequency that is directly at the intermediate frequency or transmissionfrequency.

申请人：NOKIA MOBILE PHONES LTD.

地址：P.O. Box 86 24101 Salo FI

国籍：FI

代理机构：Johansson, Folke Anders

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