公开(公告)号：US4438413A

公开(公告)日：1984-03-20

申请号：US268419

申请日：1981-05-29

Applicant: Carl R. Ryan

Inventor： Carl R. Ryan

IPC: H04L27/20 ,  H03C3/00 ,  H04L27/12

CPC classification number: H04L27/2014

Abstract: An SMSK modulator wherein the output of a bi-phase modulator is passed through a notch filter and a band pass filter to produce an SMSK signal for transmission. The notch filter and band pass filter are constructed to simulate the output (center lobe) of an SMSK conversion filter, which is defined as a filter that converts a bi-phase shift keyed (BPSK) modulated signal into MSK.

Abstract translation: 一种SMSK调制器，其中双相调制器的输出通过陷波滤波器和带通滤波器，以产生用于传输的SMSK信号。 陷波滤波器和带通滤波器被构造为模拟SMSK转换滤波器的输出（中心波瓣），其被定义为将双相移键控（BPSK）调制信号转换成MSK的滤波器。

公开(公告)号：US4344179A

公开(公告)日：1982-08-10

申请号：US205063

申请日：1980-11-07

Applicant: Carl R. Ryan

Inventor： Carl R. Ryan

IPC: H04L7/02

CPC classification number: H04L7/0054

Abstract: A stream of demodulated data is converted to unidirectional pulses, multiplied by two clock reference signals separated by 90 degrees to form two products, which products are low pass filtered and cross multiplied by the same two clock reference signals, and the products produced are summed together to provide a clock reference which is in-phase with the switching times of the data pulses. The in-phase clock pulses operate a sampling circuit to sample the data at each switching point.

Abstract translation: 解调数据流被转换为单向脉冲，乘以被90度分开的两个时钟参考信号，以形成两个乘积，该乘积被低通滤波并交叉乘以相同的两个时钟参考信号，产生的乘积相加在一起 以提供与数据脉冲的切换时间同相的时钟基准。 同相时钟脉冲操作采样电路以在每个开关点采样数据。

公开(公告)号：US4085378A

公开(公告)日：1978-04-18

申请号：US745143

申请日：1976-11-26

Applicant: Carl R. Ryan ,  James H. Stilwell

Inventor： Carl R. Ryan ,  James H. Stilwell

IPC: H04L27/227 ,  H03D3/02

CPC classification number: H04L27/2273

Abstract: An improved quadraphase shift keyed (QPSK) adaptive demodulator includes a Costas loop modified to independently cross couple the inphase (I) and quadraphase (.phi.) channels so that minimum cross talk takes place between the I and Q channels. Advantageously, the improved QPSK adaptive demodulator separates the feedback control for correcting the phasor errors in the I and Q phasors. Advantageously, the improved demodulator permits independent phase adjustment of the I and Q demodulator outputs.

Abstract translation: 改进的四图移位键控（QPSK）自适应解调器包括经过修改以独立地交叉耦合同相（I）和四通道（phi）通道的科斯塔斯循环，从而在I和Q通道之间进行最小的串扰。 有利地，改进的QPSK自适应解调器分离用于校正I和Q相量中的相量误差的反馈控制。 有利地，改进的解调器允许I和Q解调器输出的独立相位调整。