Started in 1984 by David Milne and Jim Reid,Wolfson Microelectronics was a multinational microelectronics and fabless semiconductor company headquartered in Edinburgh, United Kingdom. It specialized in signal processing and mixed-signal chips for the consumer electronics market and had engineering and sales offices throughout Asia-Pacific, Europe and the United States. Wolfson products have found applications within the digital audio player market, such as in Microsoft’s Zune product line, including the Zune 30 and Zune HD, Cowon’s line of mp3 and PMP players, as well as providing the codec functionality for much of Apple Inc.’s iPod series (with the exception of the iPod shuffle and iPod classic) and Sony’s PSP.Wolfson chips have also found place in the Microsoft Xbox game console, Logitech Squeezebox Duet and the PalmOne Treo smartphone, with the Apple connection continuing with the earlier versions of the iPhoneand iPod touch. Wolfson audio products can also be found in most Tegra 2 SoC devices and some devices like the Samsung Wave S8500 and Samsung i9000 Galaxy S smartphones,[12] as well as a number of LG phones including the LG-LB4400 music phone and the Android-powered LG Optimus GT540 smartphone. In April 2010, Wolfson signed a licence agreement with Tensilica to create a low power, high definition (HD) sound platform. Wolfson Microelectronics also produced the Audio Cards for Raspberry PI Model B Rev 2 named Wolfson Audio Card. After Wolfson Microelectronics was purchased by Cirrus Logic the Audio Card for Raspberry PI Model B+ was re-named Cirrus Logic Audio Card.