在典型的通信系统中,调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
Direct digital synthesis (DDS) is an all digital frequency synthesis technique. Because of its special theory and construction, it has many kinds of modulation capability.直接数字式频率合成(DDS)技术是一种全数字频率合成技术,其特殊的原理和结构使它具有多种调制能力。
The influence of Kerr effect to close-loop digital resonator fiber optic gyroscope based on square-wave frequency modulation was analyzed in theory.对采用方波频率调制数字闭环谐振型光纤陀螺中克尔效应的影响进行了深入的理论分析。