LDAC (codec)

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LDAC (codec)
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Developed by Sony
Type of format Audio codec

LDAC is a proprietary audio coding technology (encoder is open under Apache 2.0 license) developed by Sony, which allows streaming high-resolution audio over Bluetooth connections at up to 990 kbps at 32 bit/96 kHz. It is used by various Sony products, including headphones, smartphones, portable media players, active speakers and home theaters.

LDAC is an alternative to Bluetooth SIG's SBC and LC3 codecs. Its main competitors are Qualcomm's aptX-HD/aptX Adaptive and the HWA Union/Savitech's LHDC.[1]

LDAC is a lossless and lossy codec,[2][3] which employs a hybrid coding scheme based on the Modified discrete cosine transform[4] and Huffman coding[5] to provide more efficient data compression. By default, LDAC audio bitrate settings are set to Best Effort, which switches between 330/660/990 kbps depending on connection strength;[6] however, audio bitrate and resolution can be manually adjusted on Linux (when using Pipewire[7]), and on some Android platforms, Sony smartphones and Walkman devices at the following rates; 330/660/990 kbps at 96/48 kHz and 303/606/909 kbps at 88.2/44.1 kHz with depth of 32, 24 or 16 bits. When the codec is set to 16 bits/44.1kHz at 909 kbps (or 16 bits/48kHz at 990 kbps) LDAC can stream lossless audio that is identical in quality to (or slightly higher than) Audio CD or standard resolution uncompressed audio.[8]

Starting from Android 8.0 "Oreo", LDAC is part of the Android Open Source Project, enabling every OEM to integrate this standard into their own Android devices freely.[9][10] The encoder library is open source and the implementation for Linux is already present in bluez-alsa,[11] pulseaudio-modules-bt,[12][13] and in PipeWire's bluez5 module.[14][15] It is available on Fedora with RPM Fusion since Fedora 30.[16] However the decoder library is proprietary, so receiving devices require licenses.[17]

On 17 September 2019, the Japan Audio Society (JAS) certified LDAC with their Hi-Res Audio Wireless certification. Currently the only codecs with the Hi-Res Audio Wireless certification are LDAC and LHDC.[18]

See also

References

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External links

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