Below is a video tutorial about Analog Semiconductors: Designing with Data/Audio Switches. An electronic products such as iPhone or MP3 now have USB and headphone combine in one plug.
On this video explained about how MP3 can have only one plug for USB and headphone and how the switch work. As we know that the codec has narrow bandwidth about 20 KHz and the USB has about 40MB. For any further information, watch the video.