CSR Demonstrates Seamless Bluetooth / Wi-Fi Coexistence at Wireless Event; Simultaneous Bluetooth and Wi-Fi Demonstrated - with No Impact on Quality.

CAMBRIDGE, England -- CSR plc (LSE: CSR.L):

Ref: EMQ1447

CSR plc (LSE: CSR.L), is today demonstrating the seamless coexistence of its Bluetooth and Wi-Fi technologies during London's Wireless Event at Olympia. The company's BlueCore4 Bluetooth technology and UniFi-1 Wi-Fi solution is shown to operate on the same board and will be demonstrated in four test scenarios. This demonstration is designed to highlight that CSR Bluetooth and Wi-Fi technologies can sit alongside each other in an end-product design with no effect on the quality of either wireless link, as well as on the host product.

The demonstrations will show: a VoIP call over a Wi-Fi link using a Bluetooth headset; streaming stereo music to Bluetooth headphones whilst simultaneously browsing the internet or downloading a track; receiving a phone call over a Bluetooth headset while surfing the internet; and finally, simultaneous transfer of files, one over Bluetooth and the other over a Wi-Fi link.

The demonstration will show that UniFi, complete with UMA compliant 17dBm radio frequency output power, will not interfere with, or be disrupted by, the synchronous Bluetooth HV3 packets, providing a suitable quality of service end to end. CSR has optimized UniFi with this usage scenario in mind, and employs all commonly used frequency / time domain coexistence schemes for other 2.4GHz wireless standards.

The UniFi-1 product family, which started sampling at the end of 2004, has also been designed specifically for easy integration into consumer electronic devices. The card features BlueCore4 ROM and UniFi-1 Portable, designed specifically for cellular phones and other pocket-sized devices. The single band (2.4GHz) 802.11b/g device features an exceptionally small chip-scale package, measuring only 6x6 mm, which incorporates the RF, modem, baseband and hard MAC (media access controller) in a true single-chip format. The chip architecture itself, coupled with the lack of external components required, ensure that the UniFi silicon offers extremely low power consumption, a low bill of materials (BOM) and superior Wi-Fi performance.

"Bluetooth technology has experienced mass adoption by consumers, especially in the mobile handset market but there are still some doubts in the industry over the coexistence issues between the Bluetooth radio and the addition of a Wi-Fi radio into such a small space," commented Simon Finch, VP of CSR's Wi-Fi strategic business unit. "This demonstration truly shows that when using CSR technology these concerns are no longer an issue and that CSR's BlueCore and UniFi happily coexist in situations such as music streaming or voice calls where the slightest degradation of quality would be noticeable to the consumer."

About CSR

CSR plc is the leading global provider of Bluetooth technology and has developed expertise in other single-chip wireless communication standards such as Wi-Fi (IEEE802.11). CSR offers developed hardware/software solutions for Bluetooth based around BlueCore, a fully integrated 2.4 GHz radio, baseband and microcontroller.

CSR has now launched its fifth generation BlueCore suite and is in volume manufacture of its fourth generation BlueCore devices. BlueCore4 supports the Enhanced Data Rate (EDR) standard, which was ratified at the end of 2004. BlueCore4 remains the only EDR silicon to be shipping in volume today. In November 2004 CSR launched UniFi, the first single chip 802.11a/b/g embedded solution specifically targeting the mobile phone and consumer electronics markets.

BlueCore features in over 50 per cent of all Bluetooth devices shipped and over 60 per cent of all qualified Bluetooth enabled products and modules listed on the Bluetooth website with industry leaders including Nokia, Dell, Panasonic, Sharp, Motorola, IBM, Apple, NEC, Toshiba, RIM and Sony using BlueCore devices in their range of Bluetooth products.

In March 2005, CSR acquired Clarity Technologies Inc., for its Clear Voice Capture (CVC) technology that enhances the audio performance of any voice-based product or system. Applications for CVC include wireless headsets, handsets and automotive hands free systems.

In August 2005, CSR completed the acquisition of UbiNetics' software business, providing a strong R&D team to accelerate its existing software development in Bluetooth, Wi-Fi and UWB. The UbiNetics team gives CSR the capacity to extend its offering to mobile handset customers.

CSR has its headquarters and offices in Cambridge, UK, and offices in Japan, Korea, Taiwan, China, India, France, Denmark, Sweden and both Texas and Detroit in the USA.

More information can be found at www.csr.com and the partner web site www.btdesigner.com

More information about Bluetooth technology can be found on the SIG web site at www.bluetooth.com