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    • 62. 发明公开
    • Digital modulator
    • 数字调制器
    • EP0325459A2
    • 1989-07-26
    • EP89300509.0
    • 1989-01-19
    • Secretary of State for Defence in Her Britannic Majesty's Gov. of the United Kingdom of Great Britain and Northern Ireland
    • Harris, Robert Michael
    • H04L27/12
    • H04L27/2025H04L27/2014
    • Signal modulation apparatus for the transmission of binary data signals embodying a process which results in superior side-lobe suppression compared with other forms of modulation such as frequency shift keying. The apparatus generates two carrier waves, the difference between whose frequencies is an integral multiple of the data signal bit-rate, amplitude modulates the two waves by a low-pass filtered data signal and an inverted version thereof respectively and then sums the resulting modulated waveforms to produce a frequency keyed waveform having continuous phase and almost negligible envelope ripple. The apparatus can be used with most forms of digital communication systems and may be demudulated by a conventional receiver such as ratio detector or phase-locked loop.
    • 用于传输二进制数据信号的信号调制装置,其实现与其他形式的调制(例如频移键控)相比,其产生优异的旁瓣抑制的处理。 该装置产生两个载波,其频率之间的差是数据信号比特率的整数倍,通过低通滤波数据信号及其反相版本分别对两个波进行幅度调制,然后将所得到的调制波形 以产生具有连续相位和几乎可忽略的包络波纹的频率键控波形。 该装置可以与大多数形式的数字通信系统一起使用,并且可以由诸如比率检测器或锁相环之类的常规接收器来分解。