LC3 (codec)

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LC3
Type of format Audio
Extended to LC3plus
Standard Bluetooth 5.2 LE
LC3plus
Type of format Audio
Standard ETSI TS 103 634

LC3 ( Low Complexity Communication Codec ) is an audio codec specified by the Bluetooth Special Interest Group (SIG) for the LE Audio audio protocol introduced in Bluetooth 5.2 . [1] It's developed by Fraunhofer IIS and Ericsson as the successor of the SBC codec . [2]

LC3 provides higher audio quality and better Packet loss concealment than SBC , G.722 and Opus , according to subjective testing by the Bluetooth Special Interest Group and ETSI . [3] [4] [5] The conclusion regarding Opus is disputed as the test only included speech audio, but the comparison was made to version 1.1.4 of the reference Opus encoder, using complexity level 0 at 32 kbps and relying on CELT (general audio) instead of the FEC-capable SILK (speech); the test also did not take into account the newer version 1.2 of the Opus encoder released in 2017, where significant improvements were made to low bitrate streams. [5]

Supported systems:

LC3plus [ edit ]

LC3plus High Resolution mode is a codec defined by ETSI and is not compatible with the LC3 defined by Bluetooth SIG . [16] : 3  It's included in the 2019 DECT standard. [17]

On November 9, 2022, the Japan Audio Society (JAS) released a statement certifying LC3plus with the "Hi-Res AUDIO WIRELESS" logo. [18] LC3plus is the 4th codec to receive this, alongside MQair , LDAC and LHDC codecs.

The ETSI implementation of LC3plus is source-available software , subject to a ETSI Intellectual Property Rights Policy and the usual patent restrictions. [19]

Fraunhofer defines a way to use LC3plus over A2DP .

See also [ edit ]

References [ edit ]

  1. ^ "LE Audio" . Bluetooth Technology Website . Retrieved 2020-01-08 .
  2. ^ "LC3 / LC3plus" . Fraunhofer IIS . Retrieved 2020-01-10 .
  3. ^ Frumusanu, Andrei. "CES 2020: Bluetooth SIG Announces LE Audio Standard: New Baseline For Next Decade" . www.anandtech.com . Retrieved 2020-01-08 .
  4. ^ "New Bluetooth codec improves sound quality, benefits the hearing impaired" . Android Authority . 2020-01-07 . Retrieved 2020-01-08 .
  5. ^ a b "Digital Enhanced Cordless Telecommunications (DECT); Study of Super Wideband Codec in DECT for narrowband, wideband and super-wideband audio communication including options of low delay audio connections (≤ 10 ms framing)" (PDF) . ETSI . September 2018.
  6. ^ "Android 13 may finally bring full support for Bluetooth LE Audio" . xda-developers . 2021-12-22 . Retrieved 2022-04-22 .
  7. ^ "Features and APIs Overview - Android 13 Developer Preview" . Android Developers . Retrieved 2022-04-22 .
  8. ^ "New LC3 Encoder (I5f2f7627)" . AOSP Gerrit . Retrieved 2022-04-22 .
  9. ^ "Add new LC3 decoder (I275ea8ba)" . AOSP Gerrit . Retrieved 2022-04-22 .
  10. ^ "google/liblc3: Low Complexity Communication Codec (LC3)" . GitHub . 26 June 2023 . Retrieved 6 July 2023 .
  11. ^ Roth, Emma (2023-05-23). "Windows 11 adds support for Bluetooth's low-energy audio spec" . The Verge . Retrieved 2023-05-25 .
  12. ^ Blog, Windows Experience; Woodman, Aaron (2023-05-23). "Announcing new Windows 11 innovation, with features for secure, efficient IT management and intuitive user experience" . Windows Experience Blog . Retrieved 2023-05-25 .
  13. ^ "modules: Add zephyr lc3 codec by Casper-Bonde-Bose · Pull Request #44225 · zephyrproject-rtos/zephyr" . GitHub . Retrieved 2022-04-24 .
  14. ^ "Bluez-alsa/SRC at master · arkq/Bluez-alsa" . GitHub .
  15. ^ "BlueZ ≫ Blog Archive ≫ LE Audio support in PipeWire" .
  16. ^ LC3plus High Resolution |Specification for use as vendor specific codec via Bluetooth A2DP (PDF) , Fraunhofer Institute for Integrated Circuits IIS, 2021
  17. ^ "LC3 / LC3plus: A plus in audio quality and transmission robustness for wireless accessories" . Fraunhofer-Gesellschaft . Retrieved 2022-05-01 .
  18. ^ " "Hi-Res AUDIO WIRELESS" Two new codecs added to "Hi-Res AUDIO WIRELESS" logo's certified codecs" . Retrieved 9 November 2022 .
  19. ^ "marzzzello/LC3plus" . GitHub . 29 June 2023.
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