Bluetooth HDT: 7.5 Mbps Bandwidth For Lossless Audio

The Bluetooth Special Interest Group (SIG) has announced a new feature called Bluetooth High Data Throughput (HDT) that allows for a maximum bandwidth of 7.5 Mbps. This new feature is intended for high-bandwidth interactions between devices, including lossless audio transmission, AI, spatial computing, and more.

The previous Bluetooth LE 2M had a bandwidth of 2 Mbps, which was not sufficient for reliable lossless audio transmission. For example, CD-quality lossless audio requires around 0.8-1.4 Mbps bandwidth, while 24-bit 48 kHz lossless audio requires around 2.3 Mbps bandwidth. The new Bluetooth HDT feature exceeds these requirements, but may not be enough for the highest quality lossless audio, such as 24-bit 192 kHz, which requires around 9.2 Mbps bandwidth.

It's worth noting that devices that comply with the Bluetooth Core Specification 7.0 do not automatically have the HDT feature. The new feature is needed by sophisticated modern devices that use a lot of data in their communication, such as smartwatches, AI, or even extended reality (XR).

## Why it matters The introduction of Bluetooth HDT may finally satisfy audiophiles who have long criticized Bluetooth for its lack of bandwidth for lossless audio transmission. Purists have preferred wired over Bluetooth, especially those who prefer lossless audio over compressed formats. However, with the improved reliability and lower power consumption of HDT, audiophiles may now be able to enjoy their lossless audio wirelessly without compromising on quality.

The new feature also provides the capacity, efficiency, and wireless performance needed for high-resolution and lossless audio, making it a significant improvement over previous Bluetooth technologies. While it may not be enough for the highest quality lossless audio, it's a step in the right direction for audiophiles who want to enjoy their music without the need for wires.