To satisfy the requirement of high performance signal processing technique, it is demanded to use the direct sampling of IF signal to get quadrature signals.
为满足高性能信号处理技术要求，需要直接对中频信号进行采样来得到正交双路信号。
2
The direct factor that influences the resident electric power consumption mainly consists of requirement factor, economic factor and service factor.
影响居民电能消费的直接因素主要有需求因素、经济因素和服务因素。
3
A direct sequence spread spectrum (DSSS) receiver has strict requirement on local carrier's synchronization, and always needs complex circuits.