摘要
提出了数字调频激励器的总体框架,研究了立体声信号合成和频率调制的数字实现方案.结合理论分析和算法的仿真,完成基于FPGA+DDS结构的硬件平台设计.使用调制分析仪和立体声解码器,分析解调后信号的性能指标.测试结果表明,与传统的模拟实现方案相比,数字调频激励器中的信号合成方法结构简单,误差小,各项指标可以满足同步广播系统频率、相位和调制度相同的要求.
The framework of digital frequency modulation （FM） exciter is proposed, and the realization scheme of stereo signal composition and frequency modulation is studied. Combined with analysis and algorithm simulation, the design of hardware platform based on FPGA＋DDS structure is accomplished. The performance of the signal after demodulation is analyzed by modulation analyzer and stereo decoder. Test results indicated that, compared with the conventional analog realization scheme, the signal synthesis method in digital FM exciter had simple structure and less error, and each parameter can satisfy the requirement of synchronization in broadcasting system, demanding exat unison in frequency, phase and modulation degree.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2009年第5期436-440,共5页
Transactions of Beijing Institute of Technology
基金
国家"八六三"计划项目(2007AA01Z293)
关键词
调频激励器
直接数字频率合成
立体声
调频
frequency modulation exciter
direct digital frequency synthesis
stereo
frequency modulation
