| 摘要 |
<p>PURPOSE:To improve the operability of a radio mouse device by converting the shift positions of a mouse into electric signals to modulate them together with the command signal obtained by a switch and supplying the signal transmitted by radio to a host computer after reception and demodulation. CONSTITUTION:The signals of upper, lower, right and left positions of a mouse sent from a mouth main body are supplied to a mouth data encoder 10 together with the signals of operating switches SW1, SW2. A sampling signal fs is supplied to a mouse serial data voltage converting part 15. While an oscillating part 11 consists of a reference oscillator 12, a 1/100 divider 13, a PLL oscillation circuit 16 and a buffer amplifier 17. In addition, an oscillating part 16 secures the synchronization of phase between the output and input signals of a voltage control oscillator 20 and also keeps the oscillation frequency fo at a multiple as high as the input frequency fi. Then the modulation signal obtained by supplying the output of the part 15 to the oscillator 20 as the control voltage is transmitted. This modulation signal is received at the host computer side and demodulated.</p> |
