Nokia Technologies Oy

Riitta Elina Vaananen

Miikka Tapani Vilermo

Sampo Vesa

To implement some methods of attenuating noise it can be useful to obtain an accurate estimate of the noise in the microphone signals. Examples of the disclosure provide a method of accurately estimating incoherent noise levels. In examples of the disclosure a primary estimation of a noise amount is made. The primary estimation of a noise amount is used to determine a direction parameter and a diffuseness parameter. The determined direction parameter and the estimated diffuseness parameter are used to estimate a predicted level difference between a first microphone signal and a second microphone signal. A level difference between the first microphone signal and the second microphone signal is determined and a noise level is estimated using at least the determined level difference and the predicted level difference.

Estimating noise levels

A method, apparatus and computer program product are provided in order to coordinate the control of the volume levels of both the playback sound and the ambient sound delivered to a user via headphones. In the context of a method for controlling sound reproduction from an electronic device, a control signal is received in response to user actuation of a single input. The method also receives both playback sound and ambient sound around the electronic device. In response to the control signal, the method controls volume levels of both the playback sound and the ambient sound provided to an output channel configuration of a headphone device.

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Helsinki, Finland

Riitta Elina Vaananen