摘要
本文简要介绍了中波固态发射机中的两种新的数字调幅技术的进展——— 3D技术(数字直接驱动 )和 DSAM技术 (数字串行自适应调制 )。3D削减了固态中波发射机的射频中间放大器 ,这样就减少了发射机的复杂性和增加了可靠性。DSAM提供了在调制系统中的调制编码器和功率放大器自动的任务改变。这样就大大提高了发射机的可靠性 ,使发射机得以保持不间断播出。另外 ,应用这种新技术的另一主要益处是可以在调幅发射机上得到
30(Digital Direct Drive) and DSAM(Digital Serial Adaptive Modulation) technologies are two new digital amplitude modulation technologies in solid-state MW transmitters. 3D eliminates RF intermediate amplifiers in the transmitter, reduces the transmitter's complexity and improves its reliability. DSAM enables an automatic change of encoder's and power amplifier's tasks in modulation system and improves reliability, keeping the transmitter uninterruptedly operating. The paper makes a detailed introduction to these technologies.
出处
《广播与电视技术》
北大核心
2002年第6期105-108,16,共4页
Radio & TV Broadcast Engineering
