Low Latency High-Definition Audio Codec (LHDC) is an
audio codec
An audio codec is a device or computer program capable of encoding or decoding a digital data stream (a codec) that encodes or decodes audio. In software, an audio codec is a computer program implementing an algorithm that compresses and decompres ...
technology developed by
Savitech. LHDC allows
high-resolution audio
High-resolution audio (high-definition audio or HD audio) is a term for audio files with greater than 44.1 kHz sample rate or higher than 16-bit audio bit depth. It commonly refers to 96 or 192 kHz sample rates. However, there also ex ...
streaming over
Bluetooth
Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limi ...
. it is a high-quality Bluetooth codec based on the A2DP Bluetooth protocol and allows a bit-rate of up to 900 kbps compared to SBC's bit rate of 345 kbps.
LHDC is an alternative to
Bluetooth SIG
The Bluetooth Special Interest Group (Bluetooth SIG) is the standards organization that oversees the development of Bluetooth standards and the licensing of the Bluetooth technologies and trademarks to manufacturers. The SIG is a not-for-profit ...
's
SBC and
LC3 codecs. Its main competitors are Qualcomm's
aptX-HD/
aptX Adaptive
aptX (''apt'' stands for ''audio processing technology'') is a family of proprietary audio codec compression algorithms owned by Qualcomm, with a heavy emphasis on wireless audio applications.
History
The original aptX algorithm was developed ...
and Sony's
LDAC codec.
Starting from
Android 10
Android 10 ( codenamed Android Q during development) is the tenth major release and the 17th version of the Android mobile operating system. It was first released as a developer preview on March 13, 2019, and was released publicly on Septembe ...
, enumeration constant symbols for LHDC and LLAC are part of the
Android Open Source Project
Android is a mobile operating system based on a modified version of the Linux kernel and other open-source software, designed primarily for touchscreen mobile devices such as smartphones and tablets. Android is developed by a consortium of ...
, enabling every OEM to integrate this standard into their own Android devices freely. Older versions of Android require LHDC/LLAC enumeration constant symbols to be implemented by the smartphone manufacturers or Android app. Android apps with this type of LHDC support include Savitech's Hi-Res BT Player, FiiO Music, HIFIMAN Music and DA&T Audio.
LHDC
LHDC supports bitrates of 400/560/900 kbit/s, bit-depth of up to 24 bit and
sample rate
In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal. A common example is the conversion of a sound wave to a sequence of "samples".
A sample is a value of the signal at a point in time and/or sp ...
of up to 96 kHz.
The first
Smartphone
A smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, whic ...
to support LHDC was the
Huawei Mate 10
The Huawei Mate 10, Huawei Mate 10 Pro and Huawei Mate 10 Lite are Android smartphones designed and marketed by Huawei as part of the Huawei Mate series. There is also a Mate 10 Porsche design, which has 256Gb of storage but is otherwise identic ...
.
On 17 September 2019, the
Japan Audio Society (JAS) certified LHDC with their Hi-Res Audio Wireless certification. Currently the only codecs with the Hi-Res Audio Wireless certification are LHDC and
LDAC.
LLAC
Low Latency Audio Codec (LLAC) is also called LHDC LL. It is based on the high definition wireless audio technology from LHDC, but designed for low latency and features an auto-detect gaming mode. Savitech claims LLAC has end-to-end latency of around ~30ms. LLAC supports bitrates of 400/600 kbit/s, bit-depth of up to 24 bit and
sample rate
In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal. A common example is the conversion of a sound wave to a sequence of "samples".
A sample is a value of the signal at a point in time and/or sp ...
of up to 48 kHz. LLAC has no hardware requirement for the transmitter.
The first
Smartphone
A smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, whic ...
to support LLAC was the
Huawei P30
Huawei P30 is a line of Android-based smartphones manufactured by Huawei. Unveiled on 26 March 2019, they succeed the Huawei P20 in the company's P series line.
Specifications Hardware
Their designs are similar to those of the P20. The P30 P ...
.
Hi-Res Wireless Audio (HWA) Union
On 2 September 2018 the Hi-Res Wireless Audio (HWA) Union was formed to promote LHDC adoption. Also known as the HWA Alliance. The HWA Union Board of Directors includes:
*
AKM
The AKM () is an assault rifle designed by Soviet small arms designer Mikhail Kalashnikov in 1959. It is the most ubiquitous rifle of the Kalashnikov rifles. It was developed as a replacement to the AK-47 introduced a decade prior.
Introduc ...
* China Electronics Technology Group Corporation
*
Cirrus Logic
Cirrus Logic Inc. is an American fabless semiconductor supplier that specializes in analog, mixed-signal, and audio DSP integrated circuits (ICs). Since 1998, the company's headquarters have been in Austin, Texas.
The company's audio processo ...
*
Edifier
* Guoguang Electric
*
HiFiMAN
HiFiMAN Electronics is a Chinese manufacturer of audio products including headphones, amplifiers, and portable audio players. Hifiman is known for its high-end audio products, initially made under the brand Head-Direct but now only as HIFIMAN.
...
* HiVi
*
Huawei
Huawei Technologies Co., Ltd. ( ; ) is a Chinese multinational technology corporation headquartered in Shenzhen, Guangdong, China. It designs, develops, produces and sells telecommunications equipment, consumer electronics and various smar ...
* Institute of Acoustics of the Chinese Academy of Sciences
*
Savitech
* iriver
*
Sennheiser
Sennheiser electronic GmbH & Co. KG (, ) is a German privately held audio company specializing in the design and production of a wide range of high fidelity products, including microphones, headphones, telephone accessories and aviation headse ...
* Taihe Music Group
Other HWA Union members include:
*
ams AG
ams-OSRAM AG, formerly known as austriamicrosystems AG (originated from Austria Mikro Systeme) and ams AG (before acquiring Osram), is an Austrian electronics company that designs and manufactures sensors for small form factor, low power, high ...
*
Astell & Kern
Astell & Kern is a South Korean consumer electronics company founded in October 2013, and is wholly owned by Dreamus. The company manufactures media players, CD players, headphones, and home cinema products. It was launched as a premium success ...
*
Audio-Technica
(stylized as audio-technica) is a Japanese company that designs and manufactures professional microphones, headphones, turntables, phonographic magnetic cartridges, and other audio equipment.
Company history
Audio-Technica was established ...
* Aukey
* Cayin
* Cozoy
* Coolhere
* Colorfly
* DA&T
* DA-ART
* DUNU
*
FiiO
*
Fostex
* Haylou
* HiBy
* infly
* iEAST
* Liesheng
* Musiland
* NFJ FX-AUDIO
* OC Studio
*
Onkyo
is a Japanese consumer electronics company, specializing in premium home cinema and audio equipment, including AV receivers, surround sound speakers and portable devices. The word ''Onkyo'' translates as "sound resonance". ''On'' () is from ...
*
Pioneer
Pioneer commonly refers to a settler who migrates to previously uninhabited or sparsely inhabited land.
In the United States pioneer commonly refers to an American pioneer, a person in American history who migrated west to join in settling and de ...
* ProStereo
* QCY
* Questyle Audio
* Quloos (QLS HiFi)
* Radius
* Shanling
* S.M.S.L
*
TASCAM
*
TEAC TEAC may refer to:
* TEAC Corporation
() is a Japanese electronics manufacturer. TEAC was created by the merger of the Tokyo Television Acoustic Company, founded in 1953, and the Tokyo Electro-Acoustic Company, founded in 1956.
Overview
...
* TempTec
*
Tecsun
Tecsun Co., Ltd. () is a Chinese company founded in 1994 and headquartered in Dongguan, Guangdong. It designs and manufactures radios, from simple handheld AM/ FM receivers to more sophisticated digital units with shortwave, longwave, airband, ...
* TiinLab
* Topping
* Tube Fan Audio
* VMN
* xDuoo
* YULONG Audio
* 1MORE
HWA Certification
On March 27, 2018, Huawei and Savitech announced the Hi-Res Wireless Audio (HWA) Certification. Platinum HWA Certification requires frequency response over 40 kHz, THD+N<-90 dB, SNR>110 dB, and playback using the at least 24bit/96 kHz. Gold HWA Certification requires frequency response over 20 kHz, THD+N<-80 dB, SNR>100 dB, and playback using the at least 24bit/48 kHz.
See also
*
List of codecs
The following is a list of compression formats and related codecs.
Audio compression formats
Non-compression
* Linear pulse-code modulation (LPCM, generally only described as PCM) is the format for uncompressed audio in media files and it is al ...
*
Lossy data compression
In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size ...
References
External links
* {{official website, https://www.lhdc-audio.org/
Audio codecs