Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The digital audio data reduction technology now known as apt-X is a family of proprietary audio codec compression algorithms developed by APT Licensing. From March 14, 2009, APT Licensing changed the company's trading identity to APTX. The original 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 and eschews psychoacoustic masking techniques.

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