LDAC

LDAC is Sony's proprietary Bluetooth audio codec.
It support 3 bitrates: 990, 660 and 330kbps.
990 is about 3 times as much as the standard SBC codec.

It can transmit PCM audio up to 24 bit / 96 kHz.

From Android 8 (Oreo) on, LDAC is included.
At the present (2018) it is only Sony making devices able to receive LDAC.

 

 

Nice looking pictures by Sony.

It almost suggest LDAC is lossless but is it?

 

The bit rate of CD audio= 2*16*41100=1411 kbs
The bit rate of a 24/96 recording is 3072 kbs

 

Obvious although you can feed LDAC 24/96 it must be lossy compressed to fit into 990 kbs.
The same applies to CD audio.

It is thinkable that a lossless compression will stay below the 990. With lower bitrates the compression must be lossy.

 

Jez Ford on AVHub has a nice description of the confusion even from “official” sources about the question if this codec is lossless.
Almost hilarious is the Q&A with Sony engineers.

 

Robert Triggs has a technical description of how LDAC (possibly) might work.
It is probably lossy but in a clever way.

 

Lossy or not, at 990 kbs it is the Bluetooth audio codec with the highest bit rate up to now.

Reference

What is Sony LDAC, and how does it do it? - Jez Ford 2015

Sony LDAC - questions and answers - Jez Ford 2016

What you need to know about Sony's LDAC - Robert Triggs 2017