| 摘要 |
PURPOSE:To transmit information such as temperature while separating untrasonic noise in the natural field by providing the information such as temperature between a code system having an equal pulse interval at each other interval as the change in the pulse interval and transmitting alternately the two kinds of the pulse intervals. CONSTITUTION:The wave consists of a pulse wave, the feature of this invention is equal pulse interval at each other interval, and two kinds of pulse intervals as tA and tB are repated as shown in figure. Since this signal system is high in the regularity and the tA and the tB are not equal, the separation from the ultrasonic noise in the natural field where the relation of tA=tB exists is very excellent. An astable multivibrator circuit comprising resistors 11, 14, 18, capacitors 12, 16, NPN transistors (TRs) 13, 17, and a heat sensing element 15 starts the oscillation when a power supply 10 is applied, and its oscillating period is the sum of the inverting periods of the two time constant circuits depending on the resistor 11, the capacitor 12, the temperature sensing element 15 and the capacitor 16. Two preceding differentiation circuits are connected to a base of a PNP TR24, and the base current is applied for a very short time with an equal interval as the inverting period of the multivibrator circuit. |
