| 摘要 |
<p>PURPOSE: To make the size of the transmitter small by eliminating an exclusive oscillation circuit to output a frequency modulation signal. CONSTITUTION: A control arithmetic section 12 of a microconputer 6 receiving a clock signal from an oscillation circuit 13 to operate reads an identification code from an EEPROM 15 and switches a control signal given to a switching element 11 in response to a level of each bit. When the control signal is cleared, the oscillating frequency is F1 and when the control signal is set, one terminal of a capacitor 10 connects to ground to change the oscillated frequency into F2. The clock signal is given to a frequency divider circuit 14, in which the signal is subject to 1/m frequency division and the frequencies of output signals are respectively f1, f2 depending on the change above and the resulting signals are sent as frequency modulation signals.</p> |
