This paper introduces the structure and the theory of DVB-S demodulator and channel decoder, then introduces the hardware design and software control methods of digital demodulator and each part of channel decoder, and the result of the experiment verify the feasibility of it. 介绍DVB-S接收前端数字解调与信道解码电路的组成和原理,给出了一种新型的DVB-S数字解调信道解码器的硬件结构和软件控制方法,系统实验结果证明了该数字解调信道解码器的可行性。
This paper proposes the scheme, hardware implementation and experiment result of HFC. The system is composed of upward and downward channel optic transmission equipments, shifting frequency equipment, monitoring spectrum equipment, modulator/ demodulator and network management software. 介绍了多功能双向光纤传输平台(HFC)的系统方案、硬件实现和实验结果,整个系统包括上行光端机、下行光端机、频率变换器、频谱监测器、射频调制解调器以及网络管理软件。
The signal from measurement electrodes is switched to measurement channel which includes IA, BP filter and synchronized demodulator, then the analog signal is converted to digital signal by a 12b A/ D Card and the data is acquired by DMA mode. 检测系统对体表电极上的信号进行放大、滤波、同步解调和A/D转换后,DMA方式采集数据。
Realizes V.29 signal basic modulate and demodulate procedure which includes square root raised cosine rolling-off shaping filter and orthogonal channel signal modulator and demodulator. 分别实现了V.29信号基本调制解调过程,包括平方根升余弦滚降脉冲成形技术的滤波器实现,以及对信号的正交调制与解调过程。