| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio receiving device for performing highly efficient frequency conversion(down-conversion). <P>SOLUTION: In this radio receiving device, a first path P1 installed in a frequency converting circuit 12 is not provided with any filter, a second path P2 is provided with a filter 171 for extracting a reference signal 74c, and a second IF multiple signal 74 and a reference signal 74c are multiplied by a mixer part 12a. Therefore, the filter 171 of the second path P2 is operated as a local oscillation signal source synchronizing with the second IF multiple signal 74 by extracting the reference signal 74c. Therefore, a signal whose quality is the same as that of an input signal inputted at a transmitting device side can be regenerated from a signal obtained when the second IF multiple signal 74 is down-converted by the reference signal 74c in the mixer part 12a. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
