| 摘要 |
PURPOSE:To eliminate the sense of incompatibility at the time of channel selection and also realize a high-speed operation, by preparing properly the program via the microcomputer and thus securing the automatic rewriting of the array of the memory contents in accordance with the channel selection switch. CONSTITUTION:The frequency information to be selected is written into memory 9 based on the indication of preset channel selection switch 8, and then read out to PLL circuit 10. And local oscillation frequency sent from circuit 10 is applied to mixer 3 to perform the channel selection. Memory rewriting control unit 21 using the microcomputer is connected to memory 9, and then the frequency information signal of memory 9 is read by the indication given from start command producing circuit 22 to give the comparison to the scale of the frequency of the information stored. Based on this result of comparison, the information is rewritten in the order of the larger or smaller scale of the frequency and in accordance with the order of array of switch 8. Thus the sense of incompatibility can be eliminated, at the same time increasing the speed of channel selection. |
