Apt-X
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| Developed by | Qualcomm |
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| Type of format | Audio codec |
In digital audio data reduction technology, aptX (formerly apt-X) is a family of proprietary audio codec compression algorithms currently owned by Qualcomm.
The original aptX algorithm was developed in the 1980s by Dr. Stephen Smyth as part of his Ph.D research at Queen's University Belfast School of Electronics, Electrical Engineering and Computer Science; its design is based on time domain ADPCM principles without psychoacoustic auditory masking techniques.
aptX audio coding was first introduced to the commercial market as a semiconductor product, a custom programmed DSP integrated circuit with part name APTX100ED, which was initially adopted by broadcast automation equipment manufacturers who required a means to store CD-quality audio on a computer hard disk drive for automatic playout during a radio show, for example, hence replacing the task of the disc jockey.
Since its commercial introduction in the early 1990s, the range of aptX algorithms for real-time audio data compression has continued to expand with intellectual property becoming available in the form of software, firmware and programmable hardware for professional audio, television and radio broadcast, and consumer electronics, especially applications in wireless audio, low latency wireless audio for gaming and video, and audio over IP. In addition, the aptX codec can be used instead of SBC, the sub-band coding scheme for high-quality stereo/mono audio streaming mandated by the Bluetooth SIG for the Advanced Audio Distribution Profile (A2DP) of Bluetooth, the short-range wireless personal-area network standard. aptX is supported in high-performance Bluetooth peripherals.
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