Blackberry Corporation

James David Gordy

Brady Nicholas Laska

Michael Tetelbaum

Chris Forrester

Sylvain Angrignon

Malay Gupta

Andre John Van Schyndel

Brady Laska

A mobile communication device and a method of mitigating wind noise in a speech signal generated at a microphone of the mobile communication device. A primary microphone of the mobile communication device receives speech and wind noise and generates a first speech signal based on the speech and the wind noise that is received. A secondary microphone of the mobile communication device receives attenuated speech and generates a second speech signal based on the attenuated speech that is received. The secondary microphone is shielded from the wind noise when the primary microphone receives speech and the wind noise. A processor of the mobile communication device processes the first speech signal to replace a low frequency portion of the first speech signal with the second speech signal in order to mitigate the wind noise in the first speech signal.

Method and device for mitigating wind noise in a speech signal generated at a microphone of the device

A method, system and apparatus for loudspeaker excursion domain processing are provided. At a device comprising: a processor, a loudspeaker comprising a voice coil, one or more devices for determining loudspeaker voltage and current as a function of time, t, and a memory storing a Bl product for the loudspeaker, loudspeaker currents I(t) and corresponding voltages V(t) are received at the processor from the one or more devices. A current-from-voltage transfer function H(&#x3c9;) is derived from the loudspeaker currents I(t) and voltages V(t), as a function of frequency, &#x3c9;. A Fourier space excursion-from-voltage transfer function H(&#x3c9;) is determined, whose form is constrained by parameters H(&#x3c9;), Bl, R, and L, where: Rcomprises a resistance of the voice coil; and Lcomprises an inductance of the voice coil. Filter coefficients are determined using H(&#x3c9;), which are used in a filter applied to an input signal for the loudspeaker.

Method, system and apparatus for loudspeaker excursion domain processing

Audio input may be received at one or more microphones of a mobile device. Based on the audio input, a change in an acoustic environment of the device, such as a change in a direction of arrival of the audio input or a degradation in a quality of acoustic echo cancellation being performed upon the audio input, may be detected. A determination may be made that the detected change coincides with a non-acoustic physical event detected using an auxiliary sensor at the mobile device. The event may for example be device motion, a new proximate object, a change in a proximity of an object, a new heat source or a change in a heat level from a known heat source. Based on the determining, a signal processor, possibly comprising an audio beamformer or echo canceller, may be recalibrated, e.g. the audio beamformer or echo canceller may be caused to reconverge.

Using an auxiliary device sensor to facilitate disambiguation of detected acoustic environment changes

A telephonic device having a speakerphone function has a loudspeaker and a plurality of microphones. The plurality of microphones are coupled to a plurality of beamformers which produce a first beamform having a spatial null in the direction of the loudspeaker and a second beamform having a spatial null in the direction of near-end signals. The two beamforms are then processed to facilitate echo reduction. By comparing the beamform powers, a state of double-talk can be determined and the determination can be used to enhance echo reduction associated with speakerphone functionality.

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Ottawa, Canada

James David Gordy