设计一个半带滤波器，将信号进行2倍内插后进行滤波。-design a half band filter. twice frequence and then filter.

The Tri-Band Receiver ("TBR" here after) described in this Web site is the result of a home building project conducted during the second half of 2003. The general idea behind this project was to build a receiver capable of copying the digital mode

半带滤波器的设计,半带滤波器在设计准确重建性能的滤波器-The design of half band filter, half band filter performance of the filter in the design of accurate reconstruction