What is a new high -quality Bluetooth audio "HWA"? Huawei and the current status of a compatible manufacturer

In the first place, a codec means a audio code (Encoder) and a decoder, which is derived from these two processes and digital audio playback.The data size of the linear PCM sound source, which has a lot of redundant parts in the data, has a large data size in proportion to the sampling rate and bit depth, but can greatly compress the data by matching a certain rule.If it is decrypted based on the same rules, it will return to the state before the match, making it easier to distribute (download and stream a file) as data.

But codecs are not magic.I wrote earlier that "I will return to the state before the match", which is limited to codec (lossless codec) of a method that does not thin out information.Although the data compression rate is low as a compensation, theoretically, the original PCM sound source can be maintained without a difference (Bit Perfect), and it is useful for sound sources that emphasize sound quality such as FLAC and ALAC.

On the other hand, Bluetooth audio must contain the data amount within the specification range of the virtually standard profile "A2DP" in Hi-Fi audio.As we conclude from the purpose of this paper, A2DP must be along with Bluetooth 2.x and its expansion standard EDR (Enhanced Data Rate), and in consideration of radio waves, it is realistic that the bit rate within 1Mbps is included.It is said.The bit rate of the music CD is about 1.4Mbps, and it cannot be transmitted by Bluetooth without compression.In order to compress and transmit in real time, it is currently relying on a codec (Rossie codec) that is thinned out of information.

So which codecs are used, "SBC", which is essential for A2DP, "AAC" supported by Apple products such as iPhone/iPad, "APTX", which sings high sound quality as a CD.It will be selected from the "AptX HD" compatible with the high quality version of the high quality version, and the "LDAC" compatible with Sony, a maximum of 96kHz/24bit developed by Sony.There are other products that support other codecs, but most of the currently distributed Bluetooth audio products are composed of five types of codecs listed here.