Patent ID: 6697494
Filing Date: 2004-02-24
Classification: H04R

Abstract:
A method for generating a desired beamformer characteristic of a digital hearing aid device by the delay-and-add principle, comprising the steps of:providing a first microphone arrangement; providing a second microphone arrangement spaced by a predetermined distance from said first microphone arrangement; generating a first analog electric signal with said first microphone arrangement; generating a second analog electric signal with said second microphone arrangement; equally treating said first and said second analog electric signals, including analog to digital conversion, oversampling, and downsampling, thereby generating a first series data word signal from said first analog electric signal and a second series data word signal from said second analog electric signal, said first and second data word signals having a common format; mutually time delaying said first series data word signal by a predetermined number of increments of series data words; level-matching said first series data word sigal with second series data word signal by data word shifting and adding/subtracting operations upon at least one of said first and second series data word signals; and adding said mutually time delayed and level-matched first and second series data word signals to generate an output signal with said desired beamformer characteristic.