LDAC (codec)

LDAC is an audio coding technology developed by Sony, which allows streaming high-resolution audio over Bluetooth connections at up to 990 kbps at 24 bit/96 kHz. It is used by various Sony products, including headphones, smartphones, portable media players, active speakers and home theaters. Its main competitor is Qualcomm's aptX-HD and the HWA Union/Savitech's LHDC.[1]

LDAC (codec)
LDAC logo.tiff
Developed bySony
Type of formatAudio codec

LDAC is a lossy codec,[2][3] which employs a hybrid coding scheme based on the Modified discrete cosine transform[4] to provide more efficient data compression. LDAC can switch between 330/660/990 kbps depending on connection strength.[5]

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.[6][7]

The encoder library is open source and the implementation for Linux is already present in bluez-alsa[8] and pulseaudio-modules-bt.[9][10] It is available on Fedora with RPM Fusion since Fedora 30.[11]

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.[12]

See alsoEdit

ReferencesEdit

  1. ^ "Best Wireless Headphones of 2018". 13 November 2017. Retrieved 9 March 2018.
  2. ^ Darko, John H. (29 March 2017). "The inconvenient truth about Bluetooth audio". DAR__KO. Retrieved 13 January 2018.
  3. ^ "What is Sony LDAC, and how does it do it?". AVHub. 24 August 2015. Retrieved 13 January 2018.
  4. ^ "libldac android source code".
  5. ^ "The ultimate guide to Bluetooth headphones: LDAC isn't Hi-res". SoundGuys. 16 December 2018. Retrieved 22 September 2019.
  6. ^ "What you need to know about Sony's LDAC". 22 August 2017.
  7. ^ "platform/external/libldac - Git at Google". android.googlesource.com. Retrieved 30 November 2018.
  8. ^ "LDAC support? · Issue #104 · Arkq/bluez-alsa". GitHub. Retrieved 20 March 2019.
  9. ^ H.H, Bao (20 March 2019), Adds Sony LDAC, aptX, aptX HD, AAC codecs (A2DP Audio) support to PulseAudio on Linux: EHfive/pulseaudio-modules-bt, retrieved 20 March 2019
  10. ^ eischmann (11 February 2019). "Better Bluetooth sound quality on Linux". Brno hat. Retrieved 20 March 2019.
  11. ^ "1671064 – Review Request: libldac - LDAC library from AOSP". bugzilla.redhat.com. Retrieved 20 March 2019.
  12. ^ Yeow, Goh Beng (17 September 2019). "Japan Audio Society certifies LHDC™ for "Hi-Res Audio Wireless" certification". Porta-Fi™. Retrieved 22 September 2019.

External linksEdit