Method and apparatus for feedback suppression
AssigneeSivantos Pte. Ltd.
InventorsTOBIAS DANIEL ROSENKRANZ, TOBIAS WURZBACHER
Life of this patent
Estimating the term…
Abstract
A method and apparatus reduce feedback in a hearing aid. The method involves a first transfer function, which includes a feedback path, being estimated for a first section of a signal response. A power of a feedback signal from a second transfer function of the feedback path is estimated for a second section of the signal response, and a parameter of the signal processing device and/or of the feedback suppression unit is adjusted on the basis of the estimated power.
Claims14
A method for reducing feedback in a hearing aid having an acoustoelectric transducer, a signal processing device, a feedback suppression unit and an electroacoustic transducer, which method comprises the steps of:
- estimating a first transfer function, which includes a feedback path via the electroacoustic transducer, an acoustic signal path from the electroacoustic transducer to the acoustoelectric transducer and via the acoustoelectric transducer back to the signal processing device and a transfer function provided by the signal processing device, for a first section of a signal response;
- estimating a power of a feedback signal from a second transfer function of the feedback path for a second section of the signal response, wherein the first section and the second section are disjunct or overlap only partially and the second section is secondary to the first section in respect of a propagation time;
- adjusting a parameter of at least one of the signal processing device or a feedback suppression unit on a basis of the power estimated.
A hearing aid, comprising:
- an acoustoelectric transducer;
- a signal processing device;
- a feedback suppression unit;
- an electroacoustic transducer;
- and
- a controller configured to:
- estimate a first transfer function, which includes a feedback path via said electroacoustic transducer, an acoustic signal path from said electroacoustic transducer to said acoustoelectric transducer and via said acoustoelectric transducer back to said signal processing device and a transfer function provided by said signal processing device, for a first section of a signal response;
- estimate a power of a feedback signal from a second transfer function of said feedback path for a second section of the signal response, wherein the first section and the second section are disjunct or overlap only partially and the second section is secondary to the first section in respect of a propagation time;
- and
- adjust a parameter of at least one of said signal processing device or of said feedback suppression unit on a basis of an estimated power.
Dependencies are inferred from the claim text.