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AptX
aptX (apt stands for audio processing technology) is a family of proprietary audio codec compression algorithms owned by Qualcomm, with a heavy emphasis on wireless audio applications.
The original compression 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.
The algorithm was then commercialized under the name aptX and 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.
The company was bought by Solid State Logic ca. 1988, and became part of Carlton Communications plc. in 1989. In the early 1990s, APT's codecs were used to transfer audio via ISDN lines by companies such as Disney to check dubbing done in Europe. On 23 December 1999, Carlton Communications sold Solid State Logic to 3i. Then in 2005, Solid State Logic sold APT in a management buyout. On 1 March 2005 APT Licensing Ltd. was incorporated in Belfast (until 18 December 2008 named Audio Processing Technology Holdings Limited).
The range of aptX algorithms for real-time audio data compression expanded 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 was introduced as an alternative to SBC, the sub-band coding scheme for lossy 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.
Today, standard aptX and Enhanced aptX (E-aptX) are used in both ISDN and IP audio codec hardware from numerous broadcast equipment makers. An addition to the aptX family in the form of aptX Live, offering up to 8:1 compression, was introduced in 2007; and aptX HD, a lossy, but scalable, adaptive, "near-lossless" quality audio codec was announced in April 2009.
The company split in 2009; the broadcast hardware business was acquired by Audemat and became part of what is now WorldCast Systems, and the licensing business became APT Licensing and was acquired by CSR plc in 2010. aptX was previously styled apt-X until acquired by CSR in 2010. CSR was subsequently acquired by Qualcomm in August 2015.
The aptX audio codec is used for consumer and automotive wireless audio applications, notably the real-time streaming of lossy stereo audio over the Bluetooth A2DP connection/pairing between a "source" device (such as a smartphone, tablet or laptop) and a "sink" accessory (e.g. a Bluetooth stereo speaker, headset or headphones). The technology must be incorporated in both transmitter and receiver to derive the sonic benefits of aptX audio coding over the default sub-band coding (SBC) mandated by the Bluetooth standard. Products bearing the CSR aptX logo are certified for interoperability with each other.
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AptX
aptX (apt stands for audio processing technology) is a family of proprietary audio codec compression algorithms owned by Qualcomm, with a heavy emphasis on wireless audio applications.
The original compression 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.
The algorithm was then commercialized under the name aptX and 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.
The company was bought by Solid State Logic ca. 1988, and became part of Carlton Communications plc. in 1989. In the early 1990s, APT's codecs were used to transfer audio via ISDN lines by companies such as Disney to check dubbing done in Europe. On 23 December 1999, Carlton Communications sold Solid State Logic to 3i. Then in 2005, Solid State Logic sold APT in a management buyout. On 1 March 2005 APT Licensing Ltd. was incorporated in Belfast (until 18 December 2008 named Audio Processing Technology Holdings Limited).
The range of aptX algorithms for real-time audio data compression expanded 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 was introduced as an alternative to SBC, the sub-band coding scheme for lossy 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.
Today, standard aptX and Enhanced aptX (E-aptX) are used in both ISDN and IP audio codec hardware from numerous broadcast equipment makers. An addition to the aptX family in the form of aptX Live, offering up to 8:1 compression, was introduced in 2007; and aptX HD, a lossy, but scalable, adaptive, "near-lossless" quality audio codec was announced in April 2009.
The company split in 2009; the broadcast hardware business was acquired by Audemat and became part of what is now WorldCast Systems, and the licensing business became APT Licensing and was acquired by CSR plc in 2010. aptX was previously styled apt-X until acquired by CSR in 2010. CSR was subsequently acquired by Qualcomm in August 2015.
The aptX audio codec is used for consumer and automotive wireless audio applications, notably the real-time streaming of lossy stereo audio over the Bluetooth A2DP connection/pairing between a "source" device (such as a smartphone, tablet or laptop) and a "sink" accessory (e.g. a Bluetooth stereo speaker, headset or headphones). The technology must be incorporated in both transmitter and receiver to derive the sonic benefits of aptX audio coding over the default sub-band coding (SBC) mandated by the Bluetooth standard. Products bearing the CSR aptX logo are certified for interoperability with each other.