| Patent application number | Description | Published |
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| 20090196445 | LISTENING SYSTEM WITH AN IMPROVED FEEDBACK CANCELLATION SYSTEM, A METHOD AND USE - The invention relates to a listening system comprising a first input transducer for converting an input sound to an electrical input signal, the electrical input signal comprising a direct part and an acoustic feedback part, an output transducer for converting an electrical output signal to an output sound, a forward path being defined between the input and output transducer and comprising a signal processing unit, a feedback cancellation system for estimating acoustic feedback comprising an adaptive FBC filter arranged in parallel to the forward path, the adaptive FBC filter comprising a variable FBC filter part and an FBC update algorithm part for updating the variable FBC filter part, the FBC update algorithm part comprising first and second FBC algorithm input signals influenced by the electrical input and output signals, respectively, the first and second FBC update algorithm input signal paths comprising first and second variable filters, respectively, the listening system further comprising an electrical update signal essentially consisting of said direct part of said electrical input signal. The invention further relates to a method of improving feedback cancellation and to use of a listening system. The object of the present invention is to provide an alternative scheme for improving acoustic feedback cancellation. The problem is solved in that said first and second variable filters are adapted to be updated on the basis of said electrical update signal. An advantage of the invention is that a desired tone in the input signal is not substantially affected by the feedback cancellation system. The invention may e.g. be used in listening devices comprising active feedback cancellation, e.g. hearing aids, active ear protection devices, etc. | 08-06-2009 |
| 20100183164 | GENERATION OF PROBE NOISE IN A FEEDBACK CANCELLATION SYSTEM - The invention regards a scheme for generating a probe noise signal to be used in an anti feedback system of an audio system. The audio system comprises e.g. a microphone for capturing an audio signal, an audio signal processor for adaptation of the audio signal and a receiver for generation of an audible signal. According to an embodiment of the invention, a noise signal is injected into the audio signal path between the microphone and the receiver and used for estimating acoustical feedback, the noise signal being generated by the following steps:
| 07-22-2010 |
| 20100254555 | HEARING AID SYSTEM WITH FEEDBACK ARRANGEMENT TO PREDICT AND CANCEL ACOUSTIC FEEDBACK, METHOD AND USE - The invention relates to a hearing aid system with an electrical feedback cancellation path, for compensating acoustic feedback between an output transducer and an input transducer by subtracting an estimate of the acoustical feedback from a signal on the input side of the amplifier part, the electrical feedback cancellation path comprising an adaptive filter for providing a variable filtering function. The invention further relates to a method of compensating acoustic feedback in a hearing aid system and to its use. The object of the present invention is to provide an alternative scheme for estimating the acoustical/mechanical feedback in a hearing aid. The problem is solved in that the hearing aid system comprises a second electrical input signal consisting essentially of the direct part of said first electrical input signal (i.e. without acoustic feedback), and wherein the second electrical input signal is used to influence, preferably enhance, the filtering function of the adaptive filter of the feedback cancellation path. Preferably, the system comprises a second input transducer for generating the second electrical input signal, the second input transducer being spatially located at a position where the amplitude of the acoustical signal from the output transducer at a given frequency is smaller than at the location of the first input transducer, and wherein the electrical signal of the second input transducer is used to adapt the filtering function of the adaptive filter. Preferably, the signal path comprises a generator of an electrical probe signal for use in characterizing the feedback path. The invention may e.g. be used in binaural hearing aid systems or in connection with other electronic devices comprising a second electrical input signal, e.g. generated by a microphone separately located from a first microphone of the hearing aid. | 10-07-2010 |
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| 20100330000 | ENZYMES FOR TREATMENT OF GINGIVITIS - The invention relates to a method for treating, controlling and/or preventing diseases of the oral cavity, particularly diseases and disorders induced accumulation of plaque, by administering a chewing gum composition comprising at least one krill enzyme. Specifically, the invention is directed to a method for preventing, treating and controlling the development of gingivitis, gum disease and symptoms thereof using a composition having a krill enzyme concentration of about 0.005 U/g to about 0.05 U/g of the chewing gum composition. | 12-30-2010 |
| 20110135625 | CONTROLLED RELEASE ENZYMATIC COMPOSITION AND METHODS OF USE - The invention relates to an enzyme-containing gel composition capable of controlling enzymatic release and increasing the enzymatic activity level. When the composition includes at least one enzyme derived from Antarctic krill, it is efficient in cleansing wounds and accelerating healing, achieved in significant part by a glycol and/or glycerol gel capable of sustaining enzymatic release and/or enzymatic activity. The krill enzyme-containing gel may also be used to correct skin disorders, sterilize instruments, and facilitate transplants and treating fungal infections, bacterial infections, parasitic infections, hemorrhoids, corneal scarring, dental plaque, acne, cystic fibrosis, blood clots, immune disorders, autoimmune diseases and cancer. | 06-09-2011 |
