In recent years, much attention has been paid to software-defined radio （SDR） technologies for multimode wireless systems SDR can be defined as a radio communication system that uses software to modulate and demodul...In recent years, much attention has been paid to software-defined radio （SDR） technologies for multimode wireless systems SDR can be defined as a radio communication system that uses software to modulate and demodulate radio signals. This article describes concepts, theory, and design principles for SDR down-conversion and up-conversion. Design issues in SDR down-conversion are discussed, and two different architectures, super-heterodyne and direct-conversion, are proposed. Design issues in SDR up-conversion are also discussed, and trade-offs in the design of filters, mixers, NCO, DAC, and signal processing are highlighted.展开更多
二十世纪福克斯电影公司影片《王牌特工2：黄金圈》（Kingsman：The Golden Cirde）的前期和后期制作，包括SDR和HDR交付，全程使用了DaYinci Resolve Studio。“我把所有图像接入多台经过校准，与Goldcrest的DI系统匹配的25英寸OLED监...二十世纪福克斯电影公司影片《王牌特工2：黄金圈》（Kingsman：The Golden Cirde）的前期和后期制作，包括SDR和HDR交付，全程使用了DaYinci Resolve Studio。“我把所有图像接入多台经过校准，与Goldcrest的DI系统匹配的25英寸OLED监视器，用Smart Videohub矩阵将图像指派给视频操作人员，然后由他把这些画面发给其他所有人。”展开更多
文摘In recent years, much attention has been paid to software-defined radio （SDR） technologies for multimode wireless systems SDR can be defined as a radio communication system that uses software to modulate and demodulate radio signals. This article describes concepts, theory, and design principles for SDR down-conversion and up-conversion. Design issues in SDR down-conversion are discussed, and two different architectures, super-heterodyne and direct-conversion, are proposed. Design issues in SDR up-conversion are also discussed, and trade-offs in the design of filters, mixers, NCO, DAC, and signal processing are highlighted.
