| 摘要 |
PURPOSE:To improve the operation reliability by shifting the drive period of a ring tone display device and a visual display device so as to relieve the load of a battery and attain long service life thereby reducing the adverse effect onto other circuit. CONSTITUTION:A code collation circuit 40 is provided with a drive signal generator 41 generating a power application drive signal AS and a signal control circuit 42 as a display control means. The generation of the own call is detected by a code collation circuit main body and a call command signal CS is outputted, then a drive signal generator 41 is operated to output respectively a voice signal BS and an interruption control signal DS. Then a signal control circuit 42 generates respectively a power application drive signal AS formed by interrupting the voice signal BS with an interruption control signal DS and an inverted power application drive signal AS' formed by interrupting the voice signal BS with an inverted interruption control signal DS', they are fed respectively to amplifier circuits 6, 8. Thus, a drive current is applied reciprocatingly to the ring tone display device 7 and the visual display device 9. |
