Abstract: Embodiments of the present invention provide an in-vehicle privacy system, comprising audio output means (146, 147) associated with a first zone (110) of an interior of a vehicle (100), audio source means (250) for providing an audio signal (205) to the audio output means (146, 147), speech intelligibility means (310) for estimating a speech intelligibility in the first zone (110), control means arranged to control one or more properties of the audio signal (205) in dependence on the estimate of speech intelligibility to mask speech of a second occupant in a second zone (150) of the interior of the vehicle (100) from a first occupant with the first zone.

Abstract: Embodiments of the present invention provide an in-vehicle privacy system, comprising audio output means (146, 147) associated with a first zone (110) of an interior of a vehicle (100), audio source means (250) for providing an audio signal (205) to the audio output means (146, 147), speech intelligibility means (310) for estimating a speech intelligibility in the first zone (110), control means arranged to control one or more properties of the audio signal (205) in dependence on the estimate of speech intelligibility to mask speech of a second occupant in a second zone (150) of the interior of the vehicle (100) from a first occupant with the first zone.

Abstract: A noise-reducing device for a vehicle wheel rim comprises two elements arranged to secure the device around the wheel rim. The elements are arranged to form a closed loop that is a close fit with the wheel rim so that the device is self-retaining on the wheel rim. At least one cavity is formed in one of the elements, the cavity having an opening to provide communication between the cavity and the tyre cavity. The cavity is arranged to define at least in part a chamber that acts as a Helmholtz resonator when the device is installed onto the wheel rim.