This chip could signal the end of those adverts that shake you out of you seat by being SO MUCH LOUDER than the TV programme you've just been watching.

The CS48DV2, from Cirrus Logic, is the first audio processor to feature Dolby Laboratories' Dolby Volume technology, which is designed to normalise levels in digital TV systems.

Dolby Volume is designed to deliver consistent volume levels even with blaring commercials or when switching channels. The technology lets the user set a preferred volume level and have everything delivered that way, whatever the source or content.

And while this kind of technology isn't new, the Dolby system claims to offer a more consistent solution to the problem, being based on research into the way people hear sound. It uses a two-stage system, the first part of which, the Leveler, measures the perceptual loudness of content and applies multiband gain modifications.

The Volume Modeler, meanwhile, analyses content and playback level, restoring it to the way it would be heard at the reference volume level. For example, it compensates for the inablity of human hearing to perceive some of the subtleties of sound at low levels, and thus enhances imaging, intelligibility and audibility.

At the moment this is a two-channel processor, but Cirrus Logic says it's working on other versions suitable for use in home cinema receivers and all-in-one systems.

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