Nokia Technologies Oy

Sampo Vesa

Mikko Tapio Tammi

Ravi Shenoy

Jussi Virolainen

Anssi Sakari Rämö

Jarmo Ilkka Saari

Timo J Toivanen

Erika Reponen

Miikka Olavi Tikander

Miikka Tapani Vilermo

Mikko-Ville Laitinen

Juha Vilkamo

Mikko Johannes Honkala

Mikko-ville Laitinen

Jussi Severi Uusitalo

Jarmo Antero Hiipakka

Asta Maria Karkkainen

Topi Kaaresoja

Anssi Rämö

Riitta Väänänen

Riitta Elina Vaananen

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

According to an example embodiment, a method for processing an input audio signal () in accordance with spatial metadata () so as to play back a spatial audio signal in a device () in dependence of at least one sound reproduction characteristic () of the device is provided, the method comprising obtaining said input audio signal () and said spatial metadata (); obtaining said at least one sound reproduction characteristic () of the device; rendering a first portion of the spatial audio signal using a first type playback procedure applied on the input audio signal in dependence of the spatial metadata (), wherein the first portion comprises sound directions within a front region of the spatial audio signal; and rendering a second portion of the spatial audio signal using a second type playback procedure applied on the input audio signal in dependence of the spatial metadata () and in dependence of said at least one sound reproduction characteristic (), wherein the second portion comprises sound directions that are not included in the first portion and where the second type playback procedure is different from the first playback procedure and involves cross-talk cancellation processing.

Audio processing

According to an example embodiment, a technique for processing an input audio signal () comprising a multi-channel audio signal is provided, the technique comprising: deriving (), based on the input audio signal (), a first signal component (-) comprising a multi-channel audio signal that represents a focus portion of a spatial audio image conveyed by the input audio signal and a second signal component (-) comprising a multi-channel audio signal that represents a non-focus portion of the spatial audio image; processing () the second signal component (-) into a modified second signal component () wherein the width of the spatial audio image is extended from that of the second signal component (-); and combining () the first signal component (-) and the modified second signal component () into an output audio signal () comprising a multi-channel audio signal that represents partially extended spatial audio image.

Audio processing for adaptive loudspeaker stereo widening

A method, apparatus and computer program product provide an improved filter calibration procedure to reliably equalize the long term spectrum of the audio signals captured by first and second microphones that are at different locations relative to a sound source and/or are of different types. In the context of a method, the signals captured by the first and second microphones are analyzed. The method also determines one or more quality measures based on the analysis. In an instance in which one or more quality measure satisfy a predefined condition, the method determines a frequency response of the signals captured by the first and second microphones. The method also determines a difference between the frequency response of the signals captured by the first and second microphones and processes the signals captured by the first microphone for filtering relative to the signals captured by the second microphone based upon the difference.

Method and apparatus for output signal equalization between microphones

A method includes accessing, by at least one processing device, an audible signal including at least one in-ear microphone audible signal and at least one external microphone audible signal and at least one noise signal; training a generative network to generate an enhanced external microphone signal from an in-ear microphone signal based on the at least one in-ear microphone audible signal and the at least one external microphone audible signal; and outputting the generative network.

Enabling in-ear voice capture using deep learning

A method comprising: receiving at least one audio channel signal; receiving at least one user interface input; generating a visualization of the at least one audio channel signal dependent on the at least one user interface input; and rendering the at least one audio channel signal to generate a rendered audio signal dependent on the at least one user interface input wherein the rendered audio channel signal is substantially synchronized with the visualization of the at least one audio channel signal.

Visual spatial audio

A method includes determining, using signals captured from two or more microphones (A) configured to detect an acoustic signal from one or more sound sources, one or more prominent sound sources based on the one or more sound sources (C-D). The method further includes determining one or more directions relative to a position of one or more of the two or more microphones for the one or more prominent sound sources (B-D). The method includes modifying one or more user interface elements displayed on a user interface of a display to provide an indication at least in part of the one or more directions, relative to position of at least one microphone, of the one or more prominent sound sources (G).

Apparatus and method for audio reactive UI information and display

A method, apparatus and computer program product are provided in order to facilitate spatial audio capture by utilizing multiple audio recording devices. In the context of a method, spatial characteristics of sound recorded by a first device are determined. The method also mapping, with a processor, sound recorded by a second device to a location and orientation of the first device. As such, the spatial characteristics of the sound recorded by the second device are modified to match the spatial characteristics of the sound recorded by the first device.

Method and apparatus for facilitating spatial audio capture with multiple devices

A method comprising: generating at least one audio signal to be output by at least one speaker for a multi-speaker system; receiving at least two output signals, the at least two output signals provided by at least two microphones and based on the at least one acoustic wave output by the at least one speaker in response to the at least one audio signal; determining a directional component associated with the at least two output signals; and comparing the directional component with an expected location of the at least one speaker.

Multichannel audio calibration method and apparatus

A method to merge data recorded using a wireless external multi-microphone system is described. The method includes determining a communication delay between a mobile device and an accessory device. In response to activation of a camera application, an activation indication is sent to the accessory device and, in response, the accessory device starts recording audio. In response to a camera event, a camera event indication is sent to the accessory device. The camera event includes starting a video recording, pausing/resuming a video recording, ending a video recording or taking a photograph. In response to receiving the camera event indication, the accessory device creates a marker corresponding to the reception time. The method also includes receiving, at the mobile device, the audio data and the marker; and merging image data and the audio based on the marker and the communication delay. Apparatus and computer readable media are also described.

Wireless external multi-microphone system for mobile device environment

An apparatus including a microphone array and a removing system. The microphone array includes a binaural microphone system having first and second transducers, and a voice microphone system having at least one third transducer. The removing system is configured to remove, from signals created from the binaural microphone system, components corresponding to sound of a user's voice sensed at the at least one third transducer.

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Sampo Vesa