What is the use of Bluetooth aptx _ disable aptx HD method
When you buy a Bluetooth device, you can always see that some products have support for aptX. aptX claims to be able to bring CD-quality music via Bluetooth, but the actual results, you can't see the exact data. Because of the compressed relationship, the actual audio quality of Bluetooth audio is bound to be lost. How much improvement can aptX bring to Bluetooth audio? Before we understand aptX, let's take a look at Bluetooth audio, and then look at the format of digital music before that. The music format has two values ​​of "sampling rate" and "bit rate". In the CD format of 16bit/44.1kHz that we often hear, it is equivalent to sampling 44100 times per second, and each sampling is a number from 0 to 65535 (ie 16 digits). The larger the sample and the bit are. Then, the richer the data of music, the bigger the volume. 1 minute CD format music has about 10MB of data, which may be too big for transmission or carry-on, so the compression format such as MP3 was born. MP3 only needs 1MB of data per minute, but compressed audio format. The sound quality is even worse, and the difference between the CD format and the CD format is often easy to hear. Bluetooth audio uses a code called SBC, which is "low complexity sub-band coding", which is a compression coding, and as the Bluetooth bandwidth increases, the SBC also adds a number of different levels. The lower the advanced SBC encoding compression ratio, the more details are retained. The SBC is backward compatible, so the coding you can hear depends on which level of support is supported by one of your sources (such as a mobile phone) and your receiver (such as a Bluetooth headset). Moreover, the compression of Bluetooth code is based on the music file you use, which means that if you are listening to MP3 files, then your device will decode it and then compress it again via SBC, which is a double loss for sound quality. aptX is still a compressed encoding, but it is compressed in a different way than mentioned above. Using a compression method called "ADDM", it can reduce the secondary loss of sound quality. In simple terms, aptX can also make files. It gets smaller, but the details remain more. We may think that the larger the file, the better the sound quality. As mentioned earlier, the SBC is divided into multiple levels. The highest bit rate supported by the SBC is almost the same as aptX, so in theory they should be similar. The demand for aptX is two-way, that is, your mobile phone and headset must be supported, otherwise it will be transferred to SBC encoding. Apple products do not support aptX. Most Bluetooth headsets don't sound very good, but that's not necessarily the SBC's pot, it's probably just that the headset itself is not good. To hear the pros and cons of Bluetooth, the sound quality of the headphones itself should be good enough. To compare the difference between SBC and aptX, the best way is to use two mobile phones to connect to the same headset. Few people have done this with the media. Anecdotal has tested that aptX has a huge boost, but there are too few examples we can find. Interestingly, according to the Bluetooth specification, it can directly transfer MP3 or AAC file formats, that is, no need to pass SBC or aptX encoding compression, but no manufacturer does. aptX may have improved sound quality, but one problem is that we don't know if we are listening to aptX. There is no way to tell us what kind of code we are listening to on the phone or on the headset. Whether you enjoy the upgrade brought by aptX will not be discussed. Perhaps the development of aptX's CSR (which has been acquired by Qualcomm Qualcomm) is about how to highlight the application of this format. Magnetic Core,Soft Iron Powder Core,Ac Flux Iron Powder Core,Epoxy Coated Iron Powder Core Shaanxi Magason-tech Electronics Co.,Ltd , https://www.magason-tech.com
