Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizen OC_Formula for the clue delivery! CTOnews.com, Oct. 21 (Xinhua) Sony has previously contributed its own LDAC codec to the Android Open Source Project (AOSP), which can be used on all Android smartphones unless there is a special reason. After LDAC, Qualcomm's aptX and aptX HD audio encoders are also expected to be open source.

According to developer MishaalRahman, Qualcomm has just submitted a patch to AOSP that includes the source code for their aptX and aptX HD encoders. The license is not listed yet and it is hoped that it will be a licensable one.

MishaalRahman also said that now that aptX and aptX HD have been submitted to AOSP, it is hoped that more OEM and vendors will be able to support aptX and aptX HD encoding on their devices. For example, the encoder of Sony's proprietary BT audio codec LDAC appears in AOSP for this reason.

CTOnews.com learned that there are mainly the following kinds of Bluetooth audio codecs, namely SBC, AAC, aptX (including aptX, aptX LL, aptX HD and aptX Adaptive), LDAC, and HWA.

AptX is a digital audio compression algorithm based on subband ADPCM (SB-ADPCM) technology, which was first proposed by Dr. Stephen Smyth in the 1980s, and then further developed by CSR Company and named aptX. In essence, aptX, like SBC and AAC above, is also an audio coding format, but because of its low latency, it gradually shows its excellent side in the field of Bluetooth transmission. Since then, CSR has been acquired by Qualcomm, so now it is often written as Qualcomm aptX.

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