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Voice quality gets clearer for Bluetooth headsets

Posted: 23 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:cambridge silicon radio? csr? clear voice capture technology? cvc technology? bluelab?

Cambridge Silicon Radio (CSR) announced that its Clear Voice Capture technology (CVC) is now available to all customers in the BlueLab development system. By using BlueLab 3.2, software engineers can now easily design a mono or stereo headset or a car hands free kit containing CVC, which enhances voice quality when making calls. CSR acquired CVC technology via its purchase of Clarity Technologies in March 2005.

CVC technology features a noise suppression algorithm which extracts the user's voice from the extraneous noise of the environment. The advanced echo suppression system also removes all unwanted echoes so that headset designers can position the microphone close to a speaker (even a powerful one) in order to satisfy consumer demand for compact and attractive products. A microphone can now also be reliably integrated into a stereo headset earpiece and be able to offer high voice quality while giving no outward indication of its presence.

CSR has addressed the cost and current consumption issues linked to the implementation of echo and noise suppression technologies through both its Bluecore3-Multimedia (BC3-MM) silicon and CVC. The efficient, built-in DSP removes the need for designers to purchase an expensive external processor for audio analysis. Compared to a general-purpose RISC-based processor, the DSP is also more efficient in audio processing. This reduces the power consumption to a level similar to today's generation of headsets without integrated echo and noise suppression.

Jim Wargnier, technical manager, CSR Detroit commented "The DSP architecture in BC3-MM allows us to implement CVC, the world's leading voice enhancement software for Bluetooth devices, in the most efficient way." Wargnier continued, "The power consumption is half that of a RISC-based processor and integrating the DSP also greatly reduces costs."

- Janine Love


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