说明：  一般车载mp3都有遥控器，多数编码方式都是一样的，但并不同于一般的LC7461编码，此程序用中断方式实现车载mp3遥控器的解码，解码成功后，可用车载mp3都有遥控器做多路遥控开关。
(Generally have a remote control car mp3, most coding is the same, but different from the general LC7461 code, interrupt this program to achieve with the remote control car mp3 decoding, decoding is successful, can have a remote control car mp3 do Multiple remote control switch.)