LONDON Audio compression algorithm specialist Audio Processing Technology Ltd (Belfast, Northern Ireland) has expanded its relationship with Bluetooth chip pioneer CSR plc. to bring professional quality audio to headsets and other consumer devices.
Earlier this year CSR (Cambridge, England) said it would port APT's Enhanced apt-X compression technology into its Kalimba DSP and BlueCore 5 platform.
The CSR chips incorporating APT's technology are now beginning to appear to catch the growing the demand for audio devices with wireless capabilities, according to Stephen Wray, Licensing Business Manager at APT.
"Our apt-X technology offers significantly lower coding delays and higher error resilience than can be achieved with the existing SBC compression standard for Bluetooth, which relies on dynamic bit allocation," Wray told EE Times Europe . "Our coding algorithm offers a level of sound quality that can not be distinguished from linear/PCM audio," he adds.
Coding delays are said to be under 2ms, typically 1.9ms, and the Enhanced apt-X algorithm is also offers word depths of 16-, 20- and 24-bit, improving dynamic range to greater than 110dB.
Wray said listening tests among "golden ears" panels in the industry have proven the improvement in quality over existing standards, with panelists unable to distinguish between Enhanced apt-X and linear / uncompressed audio.
APT developed the compression technology for the professional broadcast and film post-production sector, "and we now see huge opportunities for it in the mainstream consumer electronics industry" as listeners demand better quality audio in their wireless devices such as MP3 players, wireless headsets and speakers.
"Given the high regard in which APT is held in the world of professional audio, they were a natural choice for our eXtension Partner Program through which we offer, amongst other features, enhanced audio performance", commented Anthony Murray, senior VP of CSR's Audio Strategic Business Unit.