As a reference, a CD has a sample rate of 16-bit/44.1 kHz,that’s a bitrate of 705.6kbps. Many services offer 24-bit 48kHz audio that canbe delivered over Bluetooth. However, it’s a lossy music stream. It is hard todo a lossless audio at 24-bit/96kHz over Bluetooth or Bluetooth LE Audiobecause the protocol cannot support such a bit rate.
Just to give an idea about the available services out there:Apple Music (ALAC lossless encoding) and Amazon Music Unlimited (FLAC losslessencoding) is up to 24-bit/192kHz. Dolby Atmos is a 3D immersive technology.Dolby Atmos audio files can also be encoded at up to 24-bit/192kHz. Because theshort-term average data rates for lossless encoding may approach the maximumdata rate for uncoded PCM, over 9 Mbps layer 4 throughput may be required forstereo and up to around double that for Dolby Atmos.
To count for the TCP/IP packet and Wi-Fi frame overhead andcollision detection on air, the rate at the physical layer should be around 3times the rate at the application layer. This translates to 3 x 18 Mbps = 54 Mbpsminimum PHY rate to take advantage of the full quality of a Dolby Atmos audio streamand around half that for Apple Music lossless or Amazon Music Unlimitedlossless. So, such files cannot be supported using Bluetooth or LE Audio. Wi-Fiis the way to deliver the best audio experiences.
But, as we all experience on a daily basis, usable operating time on one charge and total product lifetime are critical. Wi-Fi solutions today simply do not deliver the experience most discerning consumers expect.
Ubilite’s UBI210C has the power consumption of Bluetooth LE Audio but with Wi-Fi data rates making it possible to play lossless audio for more than 10 hours non-stop using a battery capacity of around 50mAh like theAirPod Pro2 earbuds.
