Nokia Corporation

Nokia Technologies Oy

Andrew P Bright

Jarmo Ilkka Saari

Janne J Kallio

Markus Vaalgamaa

Erkki Paajanen

Tommi Antero Raussi

Ossi Mäenpää

Tommi Raussi

Kimmo Kaukoranta

Janne Kallio

An apparatus includes first and second microphone arrangements, arranged to output first and second signals respectively and is operable in a first mode and a second mode. In the first mode, an output signal is generated based on the second signal and a third signal, where the second signal and, optionally, the first signal, can be used to compensate for ambient noise, for example, for noise cancellation when a telephone call is relayed through a speaker. In the second mode, an output signal is generated based on the first and second signals. In this manner, the combination of the first and second microphone arrangements provides a directional sensitivity that can pick up sound from a remote source, for example, in an audio or video recording session. The apparatus may include a sensor to allow automatic switching between one or more of modes, directional sensitivity patterns and types of recording session.

Apparatus including microphone arrangements

Radio terminal equipment of a communication system, the communication system comprising one or more secondary units coupled to the radio terminal equipment, the radio terminal equipment comprising: means for receiving information on audio characteristics optimising an audio signal of the secondary unit, means for converting the audio characteristics information into a form of an audio control algorithm used in the radio terminal equipment for performing a secondary unit audio control algorithm, means for optimising an audio signal of the secondary unit by using the secondary unit audio control algorithm.

Controlling method, secondary unit and radio terminal equipment

Loudspeakers can be damaged by high drive signals. One reason for this damage is an excess vibration displacement of the coil-diaphragm assembly. This invention describes a novel method for limiting this displacement by a signal processor. In the present invention, a low frequency shelving and notch filter is used to attenuate low frequencies according to a prediction of the loudspeaker displacement. A novel method for calculating coefficient values for a digital implementation of the low frequency shelving and notch filter according to the predicted displacement is described.

System for limiting loudspeaker displacement

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Helsinki, Finland

Andrew P Bright