CSR plc is a United Kingdom-based holding company. The principal activities of the Company include design and development of semiconductor integrated circuits, including platforms, and software that are used by technology and consumer-focused companies in a range of end markets. The Company operates through four segments: Voice & Music, Auto, Consumer and Legacy. Its Voice & Music segment includes mono and stereo audio products. Its Auto segment includes automotive and personal navigation device (PND) applications. The Company's Consumer segment includes cameras, gaming, document imaging, indoor location, bluetooth smart and other consumer applications. Its Legacy segment includes legacy home entertainment, handset connectivity and handset location. The Company's direct and indirect subsidiaries include Cambridge Silicon Radio Holdings Limited, NordNav Technologies Aktiebolag, APT Licensing Limited, Cambridge Positioning Systems Limited and CSR Imaging UK Limited, among others.