公开(公告)号：US4618967A

公开(公告)日：1986-10-21

申请号：US624749

申请日：1984-06-26

申请人： Ian A. W. Vance ,  Michael W. Neale

发明人： Ian A. W. Vance ,  Michael W. Neale

IPC分类号： H04L27/00 ,  H03D1/22 ,  H03D3/00 ,  H04L27/14 ,  H04L27/152 ,  H04B1/16

CPC分类号： H03D3/007 ,  H04L27/1525 ,  A23V2002/00 ,  H03D1/22

摘要： A radio receiver for frequency modulated signals in which direct conversion techniques are used to provide zero I.F. quadrature baseband signals I & Q. The I & Q signals are limited (11,12) to form square wave signals and pulse forming networks (13,14) derive pulse sequences the frequencies of which represent the polarity changes in the square wave signals. Each square wave is multiplied (15,16) by the pulse sequence derived from the other square wave to produce a unipolar pulse train. The two unipolar pulse trains are combined (17) to give a digital output signal the frequency of which is equal to the sum of the frequencies of the two pulse trains. Low pass filtering the output signal produces a simulation of the original baseband modulation.

摘要翻译： 用于频率调制信号的无线电接收机，其中使用直接转换技术来提供零I.F。 正交基带信号I＆Q。I＆Q信号被限制（11,12）以形成方波信号，脉冲形成网络（13,14）导出其频率表示方波信号极性变化的脉冲序列。 每个方波乘以（15,16）由其他方波导出的脉冲序列，以产生单极脉冲序列。 组合两个单极脉冲串（17）以产生数字输出信号，其频率等于两个脉冲序列的频率之和。 低通滤波输出信号产生原始基带调制的仿真。