LC3 (codec) explained
| LC3 |
| Nomimecode: | true |
| Genre: | Audio |
| Extended To: | LC3plus |
| Standard: | Bluetooth 5.2 LE |
| LC3plus |
| Nomimecode: | true |
| Genre: | 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.
Supported systems:
LC3plus
LC3plus High Resolution mode is a codec defined by ETSI and is not compatible with the LC3 defined by Bluetooth SIG. It's included in the 2019 DECT standard.[16]
On November 9, 2022, the Japan Audio Society (JAS) released a statement certifying LC3plus with the "Hi-Res AUDIO WIRELESS" logo.[17] LC3plus is the 4th codec to receive this, alongside SCL6 (formerly known as 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.[18]
Fraunhofer defines a way to use LC3plus over A2DP.
See also
Notes and References
- Web site: LE Audio. Bluetooth Technology Website. en-US. 2020-01-08.
- Web site: LC3 / LC3plus. Fraunhofer IIS. 2020-01-10.
- Web site: CES 2020: Bluetooth SIG Announces LE Audio Standard: New Baseline For Next Decade. Frumusanu. Andrei. www.anandtech.com. 2020-01-08.
- Web site: New Bluetooth codec improves sound quality, benefits the hearing impaired. 2020-01-07. Android Authority. en-US. 2020-01-08.
- Web site: 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. ETSI.
- Web site: 2021-12-22 . Android 13 may finally bring full support for Bluetooth LE Audio . 2022-04-22 . xda-developers . en-US.
- Web site: Features and APIs Overview - Android 13 Developer Preview . 2022-04-22 . Android Developers . en.
- Web site: New LC3 Encoder (I5f2f7627) . 2022-04-22 . AOSP Gerrit.
- Web site: Add new LC3 decoder (I275ea8ba) . 2022-04-22 . AOSP Gerrit.
- Web site: google/liblc3: Low Complexity Communication Codec (LC3) . GitHub . 6 July 2023 . 26 June 2023.
- Web site: Roth . Emma . 2023-05-23 . Windows 11 adds support for Bluetooth's low-energy audio spec . 2023-05-25 . The Verge . en-US.
- Web site: Blog . Windows Experience . Woodman . Aaron . 2023-05-23 . Announcing new Windows 11 innovation, with features for secure, efficient IT management and intuitive user experience . 2023-05-25 . Windows Experience Blog . en-US.
- Web site: modules: Add zephyr lc3 codec by Casper-Bonde-Bose · Pull Request #44225 · zephyrproject-rtos/zephyr . 2022-04-24 . GitHub . en.
- Web site: Bluez-alsa/SRC at master · arkq/Bluez-alsa . .
- Web site: BlueZ » Blog Archive » LE Audio support in PipeWire .
- Web site: LC3 / LC3plus: A plus in audio quality and transmission robustness for wireless accessories . 2022-05-01 . Fraunhofer-Gesellschaft . en.
- Web site: "Hi-Res AUDIO WIRELESS" Two new codecs added to "Hi-Res AUDIO WIRELESS" logo's certified codecs. . 9 November 2022 .
- Web site: marzzzello/LC3plus . . 29 June 2023.
