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Why do Bluetooth headsets use lossy transmission

Release time: 2021-08-09    Viewers: 57

In the early days, due to the limited bandwidth of Bluetooth headsets, lossy compression had to be used to reduce the audio bit rate before transmission. Today, Bluetooth headsets have undergone several generations of development, and the Bluetooth 4.0 limit transmission can reach 24Mbps. Looking at it now, the bandwidth requirements of lossless audio are not harsh. CD-specific lossless audio can be achieved with only 1.4Mbps bandwidth, which is far below the limit speed, but why is it still unable to achieve lossless transmission?

At present, the sound quality of Bluetooth transmission may be limited by two aspects. First of all, because of the protocol, Bluetooth transmission of audio mainly relies on the A2DP (Advanced Audio Distribution Profile) protocol. A2DP specifies the conditions that must be met when audio is transmitted via Bluetooth. If the A2DP protocol is not used for transmission, the receiver will not be able to recognize the audio data sent by the sender.


Why do Bluetooth headsets use lossy transmission


This protocol was established in the early days of the Bluetooth standard, and without considering the current situation, the amount of data during transmission was limited, so that audio data could only reach about 328kbps. So even if the new Bluetooth standard can bring higher transmission speeds, these protocols have not been updated, and they will still be limited to their limited speed when used.


Why do Bluetooth headsets use lossy transmission


Secondly, Bluetooth is also based on the 2.4GHz frequency band, and WiFi, wireless keyboard and mouse, etc. will all use this frequency band. When the transmission data is large, there will be some interference, resulting in intermittent sound, especially the audio equipment will have a significant impact on the user experience.
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