The code launch and the receiving system are one kind of typical security alarm system, its overall design mentality is composed by the code transmission circuit and the receive decoding alarm circuit two parts. The code transmission circuit is through the transmitter transmitting message, and after the digital coding, link and so on, transforms the object migration signal into the electrical signal to use the radio signal to launch, thus the object migration distance control in certain scope. And receives the alarm circuit is through to the electrical signal demodulation, the decoding and the acousto-optics reports to the police and so on, transfers the electrical signal into the sound and the photosource signal, thus achieved wireless reports to the police goal.
In this design process by circuitry primarily, therefore uses general,the foundation primary device as far as possible in the circuitelement and in the module choice, avoids using the large-scaleintegrated circuit to design the electric circuit.
After the analysis, this system uses the general PT2262/PT2272 composition the code and the decoding electric circuit, the wireless launch and the receive uses the quite practical TX315A wireless launch/ receive module, and the acousto-optics alarm system is applies the simple light emitter diode and the ringing composition.
Key Words: The code, the launch, the receive, the decoding, the alarm
