Audio devices using Bluetooth (BT) connectivity are becoming more ubiquitous than ever. Apple, among others, have eliminated the standard 3.5mm audio jack from their designs, inducing more consumers to switch to wireless BT headphones. From portable speakers and car infotainment systems to earphones and hearing aids, the Advanced Audio Distribution Profile (A2DP) is by far the most common protocol for wireless audio streaming. As part of the Bluetooth classic protocol, A2DP is designed to unidirectionally transfer an audio stream in up to two-channel stereo from one device to another. While the pervasiveness of A2DP attests to its success, new and innovative products are pushing beyond its limits in attempts to enhance user experience.
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