If you stream music from an Android phone to a pair of wireless headphones, there is a very good chance that your device is dependent on a compression algorithm known as AptX, which will clamp high quality audio to limited bandwidth offered by a Bluetooth connection. But existing AptX alternatives have their limits, so the Qualcomm company behind AptX since 2015 – introduces a new version that will grow and contract the size of audio data to accommodate the requirements of anything and where you actually stream.  The new version of AptX is called AptX Adaptive, and its main feature is the ability to compress audio with a variable bitrate. This means that if you are in an environment with many competing wireless signals, the phone will be able to compress the audio into a smaller file size, making it easier to stream to the headphones. And if you're in an empty room listening to music, AptX Adaptive will allow the phone to send a higher bit rate file for better audio quality.
Qualcomm says that the ability of AptX Adaptive goes beyond just responding to signal strength. Codec will also take into account the type of audio you are streaming ̵
AptX Adaptive is intended as a replacement for traditional AptX and newer AptX HD. Bitrate can actually go lower than normal AptX (down to 280kbps, while AptX was a flat 384kbps), but it can not reach quite high like AptX HD (only runs up to 420kbps, instead of 576kbps). Chris Havell, Senior Product Marketing Director at Qualcomm, says that the limit does not mean worse audio because compression enhancements have made AptX achieve the same quality level in a smaller file size.
"We basically improved the codec so what you got at 576 now gets you at 420." Havral says. Bitrate reduction also means more bandwidth to send data that did not override the headphones, which means that the connection can be Havell also says that AptX Adaptive is not stuck on only the two points – 280kbps and 420kbps – it can vary anywhere in between as the situation requires.
AptX Adaptive will be built into Android Pie so phones come Havell says he expects headphones with AptX Adaptive Support to appear in the first half of 2019. These headphones will be backward compatible with older versions of AptX so they will work even if the phone is not on the latest version of Android.
Unfortunately, iPhone does not support AptX, so this upgrade will only affect Android phones. Beats headphones also do not use AptX, something so m means that customers from one of the most popular wireless headsets will miss.
If you buy wireless headphones in the future, you can always check the box to find out if they support AptX. Companies must license the technology from Qualcomm, and part of the agreement is a requirement that it be advertised on the box, so you know it's there.