QSound Labs, Inc. Patent applications |
Patent application number | Title | Published |
20140037100 | MULTI-MICROPHONE NOISE REDUCTION USING ENHANCED REFERENCE NOISE SIGNAL - Systems and methods of improved noise reduction include the steps of: receiving an audio signal from two or more acoustic sensors; applying a beamformer to employ a first noise cancellation algorithm; applying a noise reduction post-filter module to the audio signal including: estimating a current noise spectrum of the received audio signal after the application of the first noise cancellation algorithm, wherein the current noise spectrum is estimated using the audio signal received by the second acoustic sensor; determining a punished noise spectrum using the time-average level difference between the audio signal received by the first acoustic sensor and the current noise spectrum; determining a final noise estimate by subtracting the punished noise spectrum from the current noise spectrum; and applying a second noise reduction algorithm to the audio signal received by the first acoustic sensor using the final noise estimate; and outputting an audio stream with reduced background noise. | 02-06-2014 |
20140023199 | NOISE REDUCTION USING DIRECTION-OF-ARRIVAL INFORMATION - Systems and methods of improved noise reduction using direction of arrival information include: receiving an audio signal from two or more acoustic sensors; applying a beamformer module to employ a first noise cancellation algorithm to the audio signal; applying a noise reduction post-filter module to the audio signal, the application of which includes: estimating a current noise spectrum of the received audio signal after the application of the first noise cancellation algorithm; using spatial information derived from the audio signal received from the two or more acoustic sensors to determine a measured direction-of-arrival by estimating the current time-delay between the acoustic sensor inputs; comparing the measured direction-of-arrival to a target direction-of-arrival; applying a second noise reduction algorithm to the audio signal in proportion to the difference between the measured direction-of-arrival and the target direction-of-arrival; and outputting a single audio stream with reduced background noise. | 01-23-2014 |
20130121498 | NOISE REDUCTION USING MICROPHONE ARRAY ORIENTATION INFORMATION - A handheld device includes: an orientation sensor; an audio processor connected to the orientation sensor and adapted to receive orientation information from the orientation sensor; and a plurality of microphones through which audio content is captured, wherein the audio processor modifies the noise reduction algorithm applied to the audio content captured based, at least in part, on the orientation information. | 05-16-2013 |
20130083948 | AUTOMATIC AUDIO SWEET SPOT CONTROL - A handheld device includes: an orientation sensor; an audio processor connected to the orientation sensor and adapted to receive orientation information from the orientation sensor; and a plurality of speakers through which audio content is provided, wherein the audio processor modifies the audio signal provided to the speakers based, at least in part, on the orientation information. A method of controlling audio content provided through a plurality of speakers in the device includes the steps of: determining a neutral orientation of the sweet spot; using information from the orientation sensor to measure the relative orientation of the device; and determining whether the relative orientation of the device has changed. If the relative orientation of the device has changed, modifying the audio content provided through the speakers. | 04-04-2013 |