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Next generation Bluetooth Audio technology LE-Audio


At present, more and more Audio products use Bluetooth for communication. In order to reduce the power consumption required by Bluetooth Audio transmission and provide more Audio functions, Bluetooth SIG launched a new generation of Bluetooth Audio technology -- LE Audio.This article will introduce the features and related applications of Bluetooth LE Audio technology.

 

LE Audio has better sound quality, lower power consumption and more innovative features

Bluetooth technology has been widely used in smart phones and various audio devices, such as Bluetooth speaker and Bluetooth headset. However, traditional Bluetooth technology still has its disadvantages in audio transmission, such as audio quality and power consumption, which still need to be improved.

 

Because of this, the bluetooth technology alliance based on bluetooth technology development of 20 years of innovation, continuously improve the performance of bluetooth Audio technology, in the first half of 2020 to launch the bluetooth Audio (LE Audio) specifications, low power consumption compared with classical Audio Audio (Classic) specifications, can provide better quality and lower power consumption, and increase such as flow, hearing more auxiliary, broadcast Audio (share), and other functions, the innovation of new bluetooth application examples, this will change the way we experience the Audio again, and to further link the world around us.

 

As the name suggests, Classic Audio runs on a Bluetooth Classic radio, while LE Audio runs on a Bluetooth Low Energy radio.Not only will LE Audio support the development of the same Audio products and use cases as Classic Audio, but it will also introduce exciting new features that promise to improve performance and enable the creation of new products and use cases.

 

Bluetooth LE Audio is the most important technical innovation of Bluetooth 5.2 specification, which brings a vital change to Bluetooth Audio applications.At present, the most common bluetooth Audio application is the wireless headset. However, The Bluetooth headset always has problems such as Audio delay and not running long enough. LE Audio can effectively improve these two problems.LE Audio will include a new high quality and Low power consumption of Audio Codec, namely the Low Complexity communication Codec (Low Complexity Communications Codec, LC3), the new Codec though than APTX, APTX - HD Audio coding, but compared with classic bluetooth Audio coding SBC, LC3 coding efficiency and quality have larger, LC3 even under Low data rate can provide high quality, it will lead to huge flexibility for the developers,Enable them to make better design tradeoffs between key product attributes such as audio quality and power consumption.

 

Want to sustain high quality at low bit rates, often is the problem of difficult to sell the cow and drink the milk, but LE Audio can under the conditions of low bit rate to provide a better quality Audio, after a lot of listening tests show that even if the bit rate was reduced by 50%, LC3 will than Classic Audio attached SBC codec provide higher Audio quality, LE Audio allows developers to trade-off between Audio quality and power consumption, the sampling rate is divided into 8, 16, 24, 32, 44.1, 48 KHZ, bit rate between 16 and 320 KBPS,Frame rates are available at 7.5ms or 10ms, so developers will be able to take advantage of this power saving feature to produce products that offer longer battery life, or, if the current battery life is sufficient, to reduce the shape size by using smaller batteries.

 

In addition, the multiple streaming audio function will realize multiple and independent audio streaming transmission synchronously between a single source device such as a smart phone and a single or multiple audio receiving devices.In doing so, developers will be able to use multi-stream audio capabilities to improve the performance of products such as true wireless earplugs.For example, they can provide a better stereo auditory experience, make the use of voice assistant services more seamless, and make switching between multiple audio source devices smoother.

 

LE Audio changes the way wireless headphones are designed

Bluetooth 5.2 The new standard supports connection-based MMC applications and its algorithmic mechanism ensures that multiple receiver devices can receive master device data synchronously.Its protocol states that each frame of data sent by the Bluetooth transmitter will have a time period, and the data received from the device after the time window will be discarded.This means that the receiver device only receives data within the valid time window, thus ensuring the synchronization of data received by multiple receivers.

 

LE Audio's multiple streaming Audio capabilities will give all true wireless headphones a binaural experience. Smartphones will be able to send the same traditional Audio signals to both ears at the same time, rather than sending them to one headset and then forwarding them to the other, as Apple's TWS does.The Bluetooth Audio product based on LE Audio will allow Audio signals to reach both headphones at the same time, developing its own true wireless headphones.In this way, multiple streaming audio features will improve the connection stability of bluetooth headsets, reduce latency, and make switching between different audio devices smoother.

 

Another innovation at LE Audio is hearing AIDS, which add support for hearing AIDS based on their low power consumption, high quality and multi-stream capabilities.Bluetooth audio has brought huge benefits to most of the world's population, such as wireless calling, listening, and viewing, making people safer, more efficient, and more interesting.LE Audio will drive the development of Bluetooth hearing AIDS to bring all the benefits of Bluetooth Audio to a growing number of hearing loss people, and within a few years, most new phones and televisions will make hearing loss users more accessible and accessible.

 

LE Audio will also add the ability to broadcast Audio so that Audio source devices can broadcast one or more Audio streams to an unlimited number of Audio receiver devices.Broadcast audio provides important new opportunities for innovation, including enabling a new Bluetooth use case called "audio sharing".

 

Bluetooth audio sharing can be personal or location-based, and through personal audio sharing, people will be able to share the Bluetooth audio experience with others around them.For example, sharing music on your smartphone with family and friends, or sharing Bluetooth audio via location-based audio over silent TV broadcasts in public places such as airports, bars, gyms, cinemas and convention centres, or providing audio in multiple languages to enhance your visitor's experience.

 

It can be seen from the Bluetooth 5.2 specification that LE Audio is an update at the level of pure software protocol stack, which is different from the CODER PHY and LE 2M PHY which require hardware support for Bluetooth 5.1. That is to say, many manufacturers can directly support The LE Audio function of Bluetooth 5.2 through the Update Software Development Kit (SDK) for some of their products.

 

Conclusion

Bluetooth LE Audio technology, the comprehensive improvement of bluetooth Audio application areas, in addition to improving both the performance of bluetooth Audio products, better quality, lower power consumption and a longer operation time), to expand the bluetooth technology to more diverse products, such as hearing AIDS, TV, conference equipment, broadcast system, etc, will bring revolutionary change for the bluetooth application, market potential will also be very surprising.