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Achieve automotive infotainment flexibility (Part 2)

Posted: 07 Mar 2011 ?? ?Print Version ?Bookmark and Share

Keywords:stream? back channel? Headphones?

Any system must distribute multiple streams of content to selected occupants, such that each occupant has control over stream selection and any interactive options that stream may offer.

Headphones offer an ideal location to put user controls to switch audio channels, pause playback, etc. However, this requires a transmission path from the headphone back to the audio source, referred to here as a "back channel."

Unfortunately, IR connections involve distinct transmitters and receivers and therefore headphones tend to be receive-only, eliminating the possibility of having playback controls on the headphone.

The majority of digital RF devices have both transmit and receive capabilities. At a minimum, this is required so that the headphone can transmit an acknowledgement back to the audio source to confirm that the audio packet was received correctly and does not need to be re-transmitted. This creates a back-channel from the headphone to the audio source that can be used for other functions, including playback controls, battery status, and identifying the brand of headphone to ensure that it is supported.

View the PDF document for more information.

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