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Why do we say that the sound quality of Bluetooth headset is not to force

If someone knows a little bit of audio knowledge, will certainly know that the Bluetooth headset sound quality is not as good as wired headphones.Some people will blame the sound quality of the Bluetooth transmission speed, but also that the Bluetooth standard upgrade and sound quality will have an inevitable link. In fact, this is really beats by dre wireless what? What causes Bluetooth audio equipment will be the sound quality constraints? Bluetooth transmission process in the beats by dre cheap loss of compression

The fundamental reason for poor sound quality of Bluetooth audio equipment is very simple, because the transmission process which uses a lossy code to compress the audio signal, while the loss of coding in order to achieve a larger compression ratio, to achieve smaller Of the amount of data, will discard the audio signal which some of the original information, while the compressed information is insufficient, which in the process of decompression restore distortion.

Damage to audio distortion is such a thing

I think a lot of people know that over-compression of the picture will produce significant noise or color, and these two phenomena is the loss of compression caused by distortion. Audio lossy compression is the case, the same will be introduced when the distortion distortion, But it is not very intuitive.Many people will be more difficult to distinguish between loss and loss of music between the difference, so even if you beats by dre sale do not feel the loss of sound caused by Bluetooth transmission is also a very normal thing.

If you want to distinguish between the loss and loss of the obvious difference between, I suggest that a lossless music can be compressed into small bit rate MP3 (preferably less than 96kbps). This contrast can be clearly found after the loss of mp3 version will be lost A lot of detail and high frequency, while the sense of density will sound down, you will feel the loss of audio a very loose sense of hearing, but with the loss of audio bit rate (file size) rise, the difference will become Getting smaller and even difficult to distinguish, far less intuitive than images and videos.

Why use damage to the transmission

In the early because of Bluetooth bandwidth is limited, so have to use the loss of compression, the audio bit rate becomes smaller after transmission.Today, Bluetooth has been several generations of development, Bluetooth 4.0 limit transmission up to 24Mbps. Now, lossless audio bandwidth requirements are not harsh, CD specifications of lossless audio only 1.4Mbps bandwidth can be achieved, far below the limit speed, but why still can not do non-destructive transmission?

At present, the sound quality of Bluetooth transmission may be limited by two aspects.Firstly because of the agreement, Bluetooth transmission audio mainly depends on A2DP (Advanced Audio Distribution Profile) protocol, A2DP provides the audio through the Bluetooth transmission must meet the conditions. The use of A2DP protocol for transmission, will lead to the receiver can not identify the sender issued by the audio data.

The protocol was established early in the Bluetooth standard, without taking into account the current situation, the amount of data transferred at the time of the constraints, making the audio data can only reach about 328kbps. So even if the new Bluetooth standard can bring higher transmission speed, But these agreements are not updated, the use will still be limited by the speed they are limited.

Second, the Bluetooth is based on the 2.4GHz band, and WiFi, wireless mouse and keyboard, etc. will use the band. Transmission of data will produce some interference, resulting in intermittent voice, especially audio equipment will have a significant impact on the user experience The

The sound quality is gradually increasing even if the amount of data when the Bluetooth audio transmission is limited by the agreement, by improving the transmission quality of the compression can improve the quality of sound, and now very popular aptX coding is achieved through this way to enhance. , Even in the case of the same bit rate can bring better compression effect, so even if limited to the agreement, still able to improve the sound quality .aptX although improve the sound quality, but did not make lossless, and lossless audio quality still There is a gap.

Not long before the Bluetooth 5.0 standard has been released, is said to be in the transmission distance and speed to enhance, rather than the previous two generations, focusing on power control. Seemingly lossless Bluetooth lossless audio transmission is expected, but this is only one Because in addition to the Bluetooth standard, but also need to follow up the relevant agreement at the same time in the compression coding, support equipment, built-in DAC must also make the appropriate upgrade from the high quality aptX code gradually more manufacturers to use Which can be seen, the full realization of non-destructive transmission of Bluetooth audio equipment is cheap beats by dr dre a matter of time sooner or later.