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1. 发明授权

US4570126A FM Demodulator using interpolation to approximate zero crossings 失效
标题翻译： FM解调器使用插值逼近过零点
公开(公告)号：US4570126A
公开(公告)日：1986-02-11
申请号：US507202
申请日：1983-06-23
申请人： Walter H. Demmer , Rolf D. Gutsmann , Norbert A. Bergs , Ingolf B. Heinemann , Otto L. Warmuth
发明人： Walter H. Demmer , Rolf D. Gutsmann , Norbert A. Bergs , Ingolf B. Heinemann , Otto L. Warmuth
IPC分类号： H03D3/00
CPC分类号： H03D3/006 , H03D2200/0062 , H03D2200/0064
摘要： For determining the half-cycle durations of the input signal which is presented as a sequence of sampled values, its zero crossings are approximated by lines which interconnect the two sampled values of different signs on both sides of the zero crossing. The half-cycle duration is derived from the number of sampled values within a period, i.e. between two consecutive zero crossings, and from the time intervals at the beginning and end of each half-cycle determined by the intersection of the approximation line with the axis. The time intervals at the beginning and end of each period are corrected for a more accurate determination of the duration and the time intervals during which the values of the individual half-cycle durations are stored, are made to approximate to these half-cycle durations. The instantaneous frequency of the input signal is determined from the values of the half-cycle durations which have thus been shifted in time by forming the reciprocal.
摘要翻译：为了确定作为采样值序列呈现的输入信号的半周期持续时间，其过零点通过在过零点两侧互连不同符号的两个采样值的线近似。半周期持续时间是从一个周期内的抽样值的数量，即在两个连续过零点之间，从每个半周期开始和结束的时间间隔，由近似线与轴的交点确定的。校正每个周期的开始和结束的时间间隔，以更准确地确定持续时间和存储各个半周期持续时间的值的时间间隔，使其接近于这些半周期持续时间。输入信号的瞬时频率根据通过形成倒数在时间上偏移的半周期持续时间的值来确定。

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