Is the first Bluetooth codec used to transmit audio. It is integrated into Advanced Audio Distribution Mode (A2DP), which is a set of default Bluetooth modes for audio transmission via Bluetooth.
Bluetooth SBC codec
Features:
Low computing power requirements
low power consumption
Support 48kHz/ 16-bit audio files.
Supports bit rates up to 345kbps (actually 256kbps).
Universal compatibility and free (the biggest advantage is that it belongs to the basic standard scheme. If any codec does not match, SBC codec will be used by default)
Large compression loss (the biggest disadvantage)
2. Advanced audio coding
Flawn Hof IIS, Dolby, Sony and other companies developed * * * to replace MP3.
Is the default codec on iOS devices, but it is not owned by Apple. Its implementation on iOS and audio quality are usually much better than Android devices.
Bluetooth AAC codec
Features:
A better lossy compression algorithm than SBC
Support 44. 1kHz/24-bit audio files.
Supports bit rates up to 320kbps.
Android support (8+)
It works better on iOS devices.
Power consumption (the biggest disadvantage: higher power consumption is required because the algorithm is complex)
Need to pay patent fees
3.aptX
AptX series codecs are owned by Qualcomm. It uses adaptive differential pulse code modulation (ADPCM), which is different from SBC and AAC. Instead of using psycho-acoustic analysis and masking to dump content that is considered unnecessary, it encodes files in different ways to reduce data bandwidth.
Qualcomm aptX
Features:
A better lossy compression algorithm than SBC
Support 48kHz/ 16-bit audio files.
Supports bit rates up to 384kbps.
Support Android 4.4+
IOS is not supported (a bit pitted)
Charge (a little expensive)
4.aptX HD
It is not an independent audio codec, but an improved aptX coding configuration file. It supports higher bit depth and bit rate. The result is better sound reproduction and less noise (greater dynamic range).
Features:
Improved aptX encoding configuration file
Support 48kHz/24-bit audio files (the biggest advantage: good sound quality)
Supports bit rates up to 576kbps.
Support Android 8+
IOS is not supported
Through these improvements, the high-definition audio it provides can be close to the quality of the original file. Despite these improvements, it has not been widely adopted by manufacturers like the standard aptX.
5.aptX LL
Like aptX HD, aptX LL is not an independent codec. LL stands for low delay. Compared with other codecs, this codec solves the delay problem, or at least greatly improves it.
Features:
Low delay (about 32 milliseconds) (the biggest advantage: it is already in the non-inductive range)
Supports bit rates up to 352kbps.
Support 44. 1kHz/ 16-bit audio files.
Smartphones are not supported (this sentence needs to be emphasized)
Delay is a common problem in other codecs except aptX LL codec. For pure music, delay is not a big problem. But for games or movies, the delay of audio and video synchronization becomes very obvious.
If you want to use wireless headphones for games or movies, you need them to support this aptX-LL codec.
There is currently no mobile phone that supports aptX LL. There is better support on the Windows desktop.
6.LDAC
Big Sony's Provides near lossless audio quality. When using LDAC codec, signal strength always plays an important role. Because this codec uses more data, any interference with the signal will reduce the bandwidth, which will lead to the decline of signal quality. The advantage of LDAC HD function will be lost.
Features:
Almost lossless sound quality (the biggest advantage)
Support 96kHz/24-bit audio files.
Supports bit rates up to 990kbps.
Android support (8+)
Headset options are limited (Sony's headphones are supported, others need to check their own parameters)
On 20 17, Sony officially opened LDAC technology to Android 8.0 system. There are also some other headset manufacturers that support LDAC.
7.LC3 (this is the king)
Also known as LE (low power consumption) audio, low complexity communication codec is the new default Bluetooth codec, which was launched at CES 2020.
Le sound
trait
Audio quality
Low delay
low power consumption
Audio sharing (! ! ! Milestone function, which can be reused)
Because it has just been launched, the complete specification is not available yet. It calls itself "the next generation Bluetooth audio", based on the innovation of the past 20 years.
If all this is true, it will change the rules of the game for users. With the continuous expansion of Bluetooth headset market, it may become the terminator of wired headset.
The above are seven mainstream Bluetooth codecs, and compare them for everyone.
Comparison of Bluetooth Coding and Decoding Methods
Do you think it's over? However, this is not the case. The above is the mainstream, and there are several smaller ones:
8.Sumsung scalable codec
Samsung Scalable Encoder, a proprietary codec developed by Samsung for its Galaxy Buds. Only Samsung devices support this codec.
Unique in that it can support various bit rates. It can adaptively switch the bit rate according to the stability of Bluetooth connection to maintain a stable connection.
With the weakening of Bluetooth connection strength, the audio codec will intelligently increase the compression ratio while reducing the bit rate. This may degrade the overall audio quality, but at least the connection will not be cut off.
9. Samsung UHQaudio
Samsung ultra-high quality Bluetooth audio codec. This is mainly used in Samsung's mobile phones, pads and neck headphones. The sound quality is really good and the ecology is really small.
10.LHDC
Low-delay high-definition audio codec is a low-delay Bluetooth audio transmission technology based on game scenes provided by LHDC. LHDC's main competitors are aptX HD and Sony's LDAC codec.
LLAC(LHCD-LL), which is based on LHCD but designed for low latency, has an automatic detection game mode with a delay of 30 milliseconds.
LHDC is also the second Bluetooth audio codec technical specification certified by Japan Audio Association after LDAC, which conforms to Hi-Res audio wireless standard.
Starting from Android 10, the encoder implementations of LHDC and LLAC are provided as part of the Android open source plan.