DSP-based Bluetooth keeps headset noise down

BlueVox DSP is the world's first ROM-based solution with an integrated DSP coprocessor and features AuriStream, CSR's low power voice codec for superior quality voice calls.

New from CSR, BlueVox DSP is a low-cost (US $6 eBOM) Bluetooth mono headset design with enhanced DSP based Clear Voice Capture (CVC) echo and noise cancellation technology.

BlueVox DSP is the world's first ROM-based solution with an integrated DSP coprocessor and features AuriStream, CSR's low power voice codec for superior quality voice calls.

With a bill of materials of just $6, CSR has designed BlueVox DSP with the richest feature set including single and dual microphone noise suppression and support for simultaneous connection to two devices.

compared with competitive solutions BlueVox DSP offers far superior audio performance and lower power consumption through its advanced DSP architecture and CVC noise cancellation, while maintaining an ultralow $6 eBOM, previously only achieved for basic low cost mono headset designs.

The $6 reference design includes all the necessary hardware and software components, including CSR's proprietary CVC software.

With the single microphone echo and noise suppression algorithm included and a licensed option to upgrade to the new dual microphone algorithm for superior noise suppression, being heard, whatever the surrounding noise is no longer a problem.

The solution also incorporates AuriStream, CSR's high quality low power voice codec that provides a fixed line quality connection and is capable of a 30% reduction in power consumption compared with standard Bluetooth voice transmission methods.

Based on CSR's proven BlueCore5-Multimedia platform, BlueVox DSP benefits from the industry's lowest cost and highest performance figures.

BlueCore5-Multimedia features a best in class audio codec with a signal to noise ratio of -95dB.

The radio transmits at +8dBm and receives at -90dBm, which eliminates any interference and enhances range when taking a call.

BlueVox DSP supports v2.1 +EDR of the Bluetooth specification, offering significant enhancements to the end user experience for secure and simple pairing between devices.

This solution also includes support for multiple connections, allowing a user to take calls from two mobile phones or a mobile phone and a VoIP dongle through a simple user interface.

Anthony Murray, Senior Vice President of CSR's Wireless Audio Strategic Business Unit says: "CSR is the only company offering a low cost ROM-based headset solution with an integrated DSP coprocessor".

"BlueVox DSP provides superior audio quality at an affordable price and enables designers to produce high quality Bluetooth headsets for low cost mass market designs".

Murray continued: "Consumers are constantly demanding better performance from their Bluetooth headsets and audio quality is something that can set a product apart from the competition".

"With a BOM of just $6, BlueVox DSP will allow designers to incorporate crystal clear audio at minimal cost".

The BlueVox DSP features a compact four-layer PCB reference design and is available in both 8 x 8mm QFN and compact 7 x 7mm BGA package options.

The BGA package option allows easy migration from BlueCore5-Multimedia Flash, for designers wishing to further reduce cost for their high-end mono headset designs.

CSR's BlueVox DSP is available now, and headsets based on BlueVox DSP are expected to be on the market later this year.

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