Does iphone 8 support aptx?

Aptx basic explanation:

Apt-X is a digital audio compression algorithm based on sub-band ADPCM(SB-ADPCM) technology. The original algorithm was proposed by Dr. Stephen Smyth in 1980s. Developed by audio processing technology company (now merged by CSR), named APT-X.

Originally used in professional audio and broadcasting fields. In recent years, in the field of Bluetooth wireless audio transmission, apt-x has the potential to replace SBC (Subband Coding) with its advantages of low delay, good fault tolerance and high sound quality.

At present, apt-x family includes aptx Bluetooth, aptx Enhancement, APTX Live (launched in 2007) and APTX Loss (launched in 2009). Apt-X has the following characteristics:

Bandwidth required: 10Hz to 22.5kHz, 56kbit/s to 576kbit/s (16bit 7.5kHz mono to 24 bit, 22.5 kHz stereo).

Extended data:

Apt-X is mainly used in the field of professional audio, providing high-quality audio, which is characterized by:

① compression ratio: 4: 1 (APTX Live is 8: 1, SBC is between 3: 1 and 6: 1).

② Word depth: 16 bit and 24 bit audio are supported (aptX enhanced version also supports 20bit audio).

③ codec delay: when the sampling frequency is 48kHZ.

④ Dynamic range (loudness): 16bit >: At 92db 92dB, 24bit >: 120B (APTX enhanced by 20bit >:1/2db, SBC 16bit is 70dB to 75dB).

References:

Baidu encyclopedia -Apt-X