Patent ID: 8050436

Claim:
A method of amplifying an acoustic signal for a hearing aid, wherein the hearing aid comprises a processing device for controlling an amplification based on a frequency gain characteristic for the hearing aid represented by a required gain curve relative to hearing loss, the method comprising: determining a feedback gain limit by measuring gain in a feedback loop of the hearing aid that causes whistling and creating a limit gain frequency response curve representing a limit to the required gain curve for addressing the occurrence of feedback whistling; creating by the processing device a target gain frequency response curve which is below the limit gain frequency response curve by shifting the limit gain frequency response curve based on a plurality of interpolation points, each interpolation point shifted a minimum distance with respect to the limit gain frequency response curve relative to at least two different directions, wherein the at least two different directions comprise a horizontal direction representing frequency and a vertical direction representing gain; and inputting by the processing device the target gain frequency response curve into the amplifying device to control the amplification in accordance with the target gain frequency response curve.