At the end of the corresponding player, it is necessary to match the three-segment and four-segment earphone interfaces. When different signals are connected separately, the earphone can work normally and play music. If the output signal of the AV interface of the video recorder can play the video normally through the earphone interface of navigation, the principle is similar. The key is to connect the video and ground wire output by the recorder with the video and ground wire of the headphone interface of the navigator.
The receiving end of navigation, if using earphone interface, can also be divided into three-stage and four-stage types. The three-level input is two signals, and the four-level input is three signals. The specific signal content inside is different from that stipulated by various navigation manufacturers. However, whether it is level 3 or level 4, there will be two input interfaces, namely video and ground, and we need to find these two signal interfaces. Ensure that the video signal and grounding signal output by the recorder can be connected with the input video signal and grounding signal on the navigator respectively. The simple way is to find a double-headed headphone cable.
Cut this wire, there are three wires in it, which are video, audio and ground wire. From the receiving end of navigation, find out the video and ground wire. The output section of the recorder is three-wire, and the navigation receiving end is three-wire (three-stage) or four-wire (four-stage). The input and output terminals are respectively connected to test one by one, and the video of the two terminals is connected with a ground wire. Once the navigation video is recorded, everything will be fine.