| 摘要 |
PURPOSE:To convert a frequency band easily by applying an analog input signal to an analog time division transmission element to be stored therein and making the period of a clock pulse applied at read different. CONSTITUTION:An input switch 1 extracts a part required for the band conversion of an analog input signal IN fed to an input terminal 2 and inputs the result to an LPF3. The analog time division transmission element 4 stores an output of an LPF3 by fetching it sequentially as an analog time division signal in response to a drive clock Kf1. Then the analog time division signal stored in the element 4 is outputted sequentially to an LPF7 in response to a drive clock Kf2 having a frequency different from that of the clock Kf1. Furthermore, an output switch 6 outputs an output the LPF7 in synchronizing with the supply of the clock Kf2. Moreover, the pass band of the LPF3, 7 is taken as <=1/2 of the frequency of the clocks Kf1, Kf2 so as to prevent generation of a reflected distortion of the element 4. |
