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L2HC (Low Latency Low Complexity High Resolution Audio Codec[1]) is a wirelessaudio codec technology developed by Huawei. L2HC allows high-resolution audio streaming over Bluetooth or NearLink with lossless data compression of digital music. It is a high-quality Bluetooth based on the A2DP Bluetooth protocol and NearLink based on its native L2HC 3.0+ StarLink protocol with Polar protocol by Huawei and allows a bit-rate of up to 1.5Mbps compared to SBC's bit rate of 345kbps and LDAC's bitrate of 960kbps.[2] L2HC has been registered as group standard T/CAIACN 009 by China Audio Industry Association in accordance with the Standardization Law of the People's Republic of China.[3]
| Type of format | Audio codec |
|---|---|
| Standard | T/CAIACN 009 |
L2HC is an alternative to Bluetooth SIG's SBC and LC3 codecs. Its main competitors are Savitech's LHDC, Qualcomm's aptX-HD/aptX Adaptive and Sony's LDAC codec.[4]
Starting from AOSP-based EMUI 11 in 2020, L2HC audio codec has been part of Huawei products, especially audio products from Huawei FreeBuds line. Compared with Sony's LDAC, Huawei's L2HC provides more flexible bitrate space, and can adapt to a lower bitrate in the face of interference and other scenarios, so as to better balance sound quality and lag. Currently, some Huawei models support L2HC when upgraded to EMUI 11 or HarmonyOS 2.0 or later alongside OpenHarmony and Oniro OS. In September 2023, the audio codec was updated, L2HC 3.0 which increased the high transmission bit rate, with peak bit rate up to 1920kbit/s with 1.5Mbit/s of Bluetooth transmission that is compared to CD audio quality.[5][6][7][8]
See also
editReferences
edit- ^ Draft Specification 2023.
- ^ "Huawei FreeBuds Studio Review". headphonecheck.com. Retrieved 29 April 2024.
- ^ "Low Latency Low Complexity High Resolution Audio Codec Technology Specification" (PDF).
- ^ Slavov, Mariyan (28 August 2023). "Huawei FreeBuds 5 review: Ear fashion". PhoneArena. Retrieved 29 April 2024.
- ^ "什么叫HWA？和 HiRes，LDAC，L2HC有什么区别？". 知乎专栏 (in Chinese). Retrieved 29 April 2024.
- ^ "星闪Nearlink与蓝牙不完全对比--与苹果/高通硬碰硬的草蛇灰线". 知乎专栏 (in Chinese). Retrieved 29 April 2024.
- ^ "什么样的蓝牙耳机支持CD级的无损音乐播放？科普+推荐". 知乎专栏 (in Chinese). Retrieved 29 April 2024.
- ^ Matsui, Emiko (19 September 2023). "Huawei L2HC 3.0 delivers 1.5Mbps lossless sound quality, 4X faster than Apple's AAC". Huawei Central. Retrieved 29 April 2024.
Sources
edit- Draft Specification (2023). "Low Latency Low Complexity High Resolution Audio Codec Technology Specification" (PDF). caianet.org.cn.
- Patent Application (16 July 2020). "High Resolution Audio Coding" (PDF). Retrieved 25 May 2024.
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