This text mainly introduced a kind of take a machine AT89C51 and many s of a sound decoding integrated circuit MT8870s as the core, pass the long range of the telephone circuit remote control many road intelligence controller.That system is practical, the function is vivid and diverse, can carry on the search and controls towards was control from a distance the appearance of the object, can extensively of application in home appliances or various control equipments of other amenities.
Keyword:The telephone control from a distance, an audio frequency plait decoding, a machine control
