Qualcomm® aptX™

Consistent, high quality audio over Bluetooth

Girl in hammock listening to wireless headphones

The tech that delivers a high quality wireless audio experience

The original aptX audio technology powers the wireless sound behind many of the world’s finest devices that you love, so you can stream music from your favourite media services without compromising on sound quality.

aptX audio is a bit rate efficient technology that ensures you receive high quality audio from your Bluetooth® device, so you have a better listening experience.

Key Features

Consistent audio quality

Fixed compression ratio ensures consistency

Full spectrum of sound

From 20Hz to 20kHz, aptX audio covers the human hearing range

Interoperability testing program

We operate rigorous testing for all aptX enabled products, so you can be confident all products will deliver the same audio quality

Technical Specifications

Sound quality
  • THD+N@1kHz: -67dB
  • SNR@1kHz:  93dB
  • PEAQ audio quality:-0.18
  • Qualcomm® Kalimba™ MHz DSP technology: 42MHz@48KHz stereo decode ~45MHz@48KHz stereo encode
Audio Encoding
  • 16-bit, up to 48kHz sampling rate
Program memory usage
  • 3.3kwords (encoder) / 3.6kwords (decoder) 
Data memory usage
  • 1.8kwords
ARM MHz
  • ~63MHz (stereo encode) on ARMv7A with NEON 
Bit Rate
  • 384 kbps (48 kHz sampling)

The other versions of aptX

By adapting sound to the use case, say watching a video rather than listening to music, it optimizes your experience and brings improved robustness for a better listening experience, fully synchronized audio and video and an overall more seamless user experience.

Designed to deliver high definition (HD) audio over Bluetooth, to help you get the very most from your music.

Designed to deliver fully synchronized audio and video content, just the thing for using a Bluetooth wireless headset for gaming, where milliseconds mean virtual life or death.

Qualcomm aptX is a product of Qualcomm Technologies, Inc. and/or its subsidiaries.