LC3 (codec)
Type of format | Audio |
---|---|
Extended to | LC3plus |
Standard | Bluetooth 5.2 LE |
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 32kbps 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:
- Android 13;[6][7][8][9] Google's liblc3 codec is open-source as a standalone GitHub project[10]
- Windows 11[11][12]
- Zephyr OS[13]
- Linux via bluez-alsa[14] or BlueZ + PipeWire[15]
LC3plus
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
References
- ↑ "LE Audio" (in en-US). https://www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/le-audio/.
- ↑ "LC3 / LC3plus". https://www.iis.fraunhofer.de/en/ff/amm/communication/lc3.html.
- ↑ Frumusanu, Andrei. "CES 2020: Bluetooth SIG Announces LE Audio Standard: New Baseline For Next Decade". https://www.anandtech.com/show/15349/bluetooth-sig-announces-le-audio-standard-new-baseline-for-next-decade.
- ↑ "New Bluetooth codec improves sound quality, benefits the hearing impaired" (in en-US). 2020-01-07. https://www.androidauthority.com/bluetooth-lc3-codec-1071609/.
- ↑ 5.0 5.1 "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)". September 2018. https://www.etsi.org/deliver/etsi_tr/103500_103599/103590/01.01.01_60/tr_103590v010101p.pdf.
- ↑ "Android 13 may finally bring full support for Bluetooth LE Audio" (in en-US). 2021-12-22. https://www.xda-developers.com/android-13-may-add-blueooth-le-audio-support/.
- ↑ "Features and APIs Overview - Android 13 Developer Preview" (in en). https://developer.android.com/about/versions/13/features#btle-audio.
- ↑ "New LC3 Encoder (I5f2f7627)". https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/1891675.
- ↑ "Add new LC3 decoder (I275ea8ba)". https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/1936078.
- ↑ "google/liblc3: Low Complexity Communication Codec (LC3)". 26 June 2023. https://github.com/google/liblc3.
- ↑ Roth, Emma (2023-05-23). "Windows 11 adds support for Bluetooth's low-energy audio spec" (in en-US). https://www.theverge.com/2023/5/23/23733299/windows-11-bluetooth-low-energy-le-support-build.
- ↑ Blog, Windows Experience; Woodman, Aaron (2023-05-23). "Announcing new Windows 11 innovation, with features for secure, efficient IT management and intuitive user experience" (in en-US). https://blogs.windows.com/windowsexperience/2023/05/23/announcing-new-windows-11-innovation-with-features-for-secure-efficient-it-management-and-intuitive-user-experience/.
- ↑ "modules: Add zephyr lc3 codec by Casper-Bonde-Bose · Pull Request #44225 · zephyrproject-rtos/zephyr" (in en). https://github.com/zephyrproject-rtos/zephyr/pull/44225.
- ↑ "Bluez-alsa/SRC at master · arkq/Bluez-alsa". https://github.com/arkq/bluez-alsa/tree/master/src.
- ↑ "BlueZ » Blog Archive » LE Audio support in PipeWire". http://www.bluez.org/le-audio-support-in-pipewire/.
- ↑ LC3plus High Resolution |Specification for use as vendor specific codec via Bluetooth A2DP, Fraunhofer Institute for Integrated Circuits IIS, 2021, https://www.iis.fraunhofer.de/content/dam/iis/en/doc/ame/Whitepaper/LC3plus_Bluetooth-A2DP-profile.pdf
- ↑ "LC3 / LC3plus: A plus in audio quality and transmission robustness for wireless accessories" (in en). https://www.digitalmedia.fraunhofer.de/en/veranstaltungen/ibc-2020/trendbrochure/lc3---lc3plus--a-plus-in-audio-quality-and-transmission-robustne.html.
- ↑ ""Hi-Res AUDIO WIRELESS" Two new codecs added to "Hi-Res AUDIO WIRELESS" logo's certified codecs.". https://www.jas-audio.or.jp/news/post17967.
- ↑ "marzzzello/LC3plus". 29 June 2023. https://github.com/marzzzello/LC3plus.
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