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In other words: the audio latency should ideally be small enough to not be noticeable. When watching a video, you do not want the audio to lag behind. Devices may select lower-quality modes to favor a stable connection over sound quality (example: these Sony headphones). SBC, for example, comes with three quality modes, low (201 kb/s), middle (229 kb/s) and high (328 kb/s). Please let me know by commenting below if you know of any publications.Īnother aspect influencing fidelity is that implementations do not always use a codec’s maximum bitrate. Unfortunately, nobody seems to have performed such listening tests in a scientific, reproducible manner (at least I could not find any information). Fidelity can only be determined by double-blind listening tests.

Different codecs can be very different in encoding efficiency, as are H.264 and its successor H.265 for video (the latter only needs about half as many bits for the same visual quality). The bitrate by itself does not tell us anything about a codec’s fidelity, however. Specifically, the maximum bitrate of 352 kb/s is not much higher than SBC’s 320-345 kb/s (SBC depending on implementation). Audio FidelityĪs this overview shows, the technical specifications of the base aptX code are similar to that of SBC.

Let’s break this quality question down into two different aspects: fidelity and latency. Figuring out whether that is actually true is harder than expected. Qualcomm, who acquired the aptX company CSR in 2015, claims that aptX offers “superior audio”. Vintage DeWald Table Radio by Joe Haupt under CC What is aptX?ĪptX is an alternative codec for the Bluetooth A2DP protocol.