LONDON — Shares in Wolfson Microelectronics (Edinburgh, Scotland) rose sharply on the London stock exchange as the maker of mixed signal chips revealed that Nokia is using the company's myZone ambient noise cancellation technology in the latest Bluetooth Stereo Headset , the Nokia BH-905.

The headset will be one of the most sophisticated on the market when it hits retailers in August.

myZone technology uses patented acoustic design and signal processing technology to capture the ambient noise, generate an anti-noise signal and drive the headset speaker at exactly the right moment to ensure unwanted ambient noise is cancelled before it hits the ear-drum.

Wolfson says compared with competitive technology, myZone cancels more noise over a wider spectrum of the audible frequency range.

The design is based on technology that came through the acquisition in 2007 of Sonaptic Ltd. (High Wycombe, England).

The deal is a major boost for Wolfson, still reeling from last year’s loss of key add-on contracts from Apple which led to a major slide on its stock value.

And it is the first publicly revealed contract with Nokia, a company it has been very keen to supply with parts, notable for mobile phones.

Earlier this year, the UK's Financial Services Authority fined Wolfson £140,000 for failing to tell the market it had lost a contract to provide chips for the latest generation of Apple iPods.

Nokia plans to start selling the BH-905 in August, with prices before taxes and subsidies expected to be around Euros 285.

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