Patent application number | Description | Published |
20080253552 | Acoustic Echo Canceller - An acoustic echo cancellation device ( | 10-16-2008 |
20080267378 | Conference System - A conference system ( | 10-30-2008 |
20080300869 | Audio Signal Dereverberation - A method of estimating the reverberations in an acoustic signal (y) comprises the steps of determining the frequency spectrum (Y) of the signal (y), providing a first parameter (α) indicative of the decay of the reverberations part (r) of the signal over time, and providing a second parameter (β) indicative of the amplitude of the direct part (d) of the signal relative to the reverberations part (r). An estimated frequency spectrum ({hacek over (R)}) of the reverberations signal (r) is produced using the frequency spectrum (Y) of a previous frame, the first parameter (α), and the second parameter (β). The second parameter (β). The second parameter (β) is preferably inversely proportional to the early-to-late ratio of the signal (y). | 12-04-2008 |
20100020984 | SIGNAL PROCESSING SYSTEM AND METHOD - A signal processing system comprises a microphone ( | 01-28-2010 |
20100189274 | DEVICE FOR AND A METHOD OF PROCESSING AUDIO SIGNALS - A method is provided which is suitable to cope with non-linear echo paths during acoustic echo cancellation in speakerphones. Non-linear paths occur particularly in hands-free operation of, e.g., a mobile phone, due to driving the amplifier and loudspeaker in the non-linear range. The idea is to combine the commonly known one microphone approach of linear acoustic echo cancellation using an adaptive filter and a post-processor together with a multiple microphone approach using beam forming which separately removes the non-linear part of the echo. | 07-29-2010 |
20110007073 | METHOD AND APPARATUS FOR MODIFYING A DIGITAL IMAGE - A digital image ( | 01-13-2011 |
20110103625 | AUDIO PROCESSING - An audio processing arrangement ( | 05-05-2011 |
20110206212 | Microphone System and Method of Operating the Same - A microphone system is provided, wherein the microphone system comprises a microphone array comprising a plurality of microphone units each adapted to generate a primary signal indicative of an acoustic wave received from the respective microphone unit, a first echo cancellation unit, an integrator unit, and a combination unit, wherein the microphone system is adapted to generate a first dipole response and a monopole response from the primary signals, wherein the integrator unit is adapted to generate a first integrated dipole response by integrating the first dipole response, wherein the first echo cancellation unit is adapted to generate a first echo cancelled integrated dipole response from the first integrated dipole response, and wherein the combination unit is adapted to combine the monopole response and the first echo cancelled integrated dipole response. | 08-25-2011 |
20110232989 | ESTIMATING A SOUND SOURCE LOCATION USING PARTICLE FILTERING - A sound source location is estimated by particle filtering where a set of particles represents a probability density function for a state variable comprising the sound source location. The method includes determining the weight for a particle in response to a correlation between estimated acoustic transfer functions from the sound source to at least two sound recording positions. A weight update function may specifically be determined deterministically from the correlation and thus the correlation may be used as a pseudo-likelihood function for the measurement function of the particle filtering. The acoustic transfer functions may be determined from an audio beamforming towards the sound source. The audio weight may be combined with a video weight to generate a multi-modal particle filtering approach. | 09-29-2011 |
20110264249 | METHOD OF, AND APPARATUS FOR, PLANAR AUDIO TRACKING - A planar audio tracking system comprises a square array of four microphones (M | 10-27-2011 |
20110264450 | SPEECH CAPTURING AND SPEECH RENDERING - The invention proposes extracting one or more speech signals ( | 10-27-2011 |
20110288864 | SPEECH DETECTOR - A method for detecting speech using a first microphone adapted to produce a first signal (x), and a second microphone adapted to produce a second signal (x | 11-24-2011 |
20120063609 | ACOUSTIC MULTI-CHANNEL CANCELLATION - A multi-channel acoustic echo canceller arrangement comprises a microphone ( | 03-15-2012 |
20120082335 | EARPHONE ARRANGEMENT AND METHOD OF OPERATION THEREFOR - An earphone arrangement comprises a microphone ( | 04-05-2012 |
20140257126 | SYSTEMS AND METHODS FOR COMBINED RESPIRATORY THERAPY AND RESPIRATORY MONITORING - Provided are systems and methods for combined respiratory therapy and respiratory monitoring. A respiratory therapy and respiratory monitoring apparatus as described herein may include a spacer portion having first and second ends, wherein the first end includes a patient interface and the second end includes a respiratory therapy device. A monitoring device such as, for example, a microphone is incorporated into the spacer portion so as to record sounds from within the apparatus. The sounds may be processed and otherwise analyzed to derive one or more characteristics therefrom. These characteristics may be used to make one or more determinations relevant to the monitored and treated patient. | 09-11-2014 |
20150086005 | AUDIO SIGNAL PROCESSING IN A COMMUNICATION SYSTEM - Communications equipment for use by a call centre to enable communications between the call centre and one or more user devices is provided, with the communications equipment comprising audio processing circuitry for processing audio signals received from the user devices over a communications network, wherein the processing circuitry is configured to perform acoustic echo cancellation and/or noise suppression and/or dereverberation processing on the received audio signals to cancel acoustic echoes and/or suppress noise and/or suppress reverberation that is present in the audio signals received from the user device. | 03-26-2015 |