The Raspberry Pi Model B+ has a common 4-pin jack plug for audio and video signals.
Raspberry Pi B+ Assignment audio-video signal at the 4-pin jack plug, The datasheet or the circuit diagram of the model B+ shows the following picture detail for the assignment of the jack socket:
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| 1 (plug) | 2 | 3 | 4 (top) |
| video | Ground (GND) | Right (right audio channel) | Left (left audio channel) |
The assignment is identical to the Apple iPod. However, not with the iPhone or iPad. There is no video output, but a microphone input, but the Raspberry Pi does not. Audio Enhancements The analog audio output of the Raspberry Pi is extremely bad. Noise, humming and a miserable sound are simply no fun. If it goes beyond experimentation, then audio extensions for GPIO or USB are recommended.
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