Patent ID: 8121309

Claim:
A method for adjusting a directional microphone of a hearing device, comprising: electrically connecting at least two omnidirectional microphones to each other; each of said at least two omnidirectional microphones generating respective first and second microphone signals; delaying the second generated microphone signal by a first delay time imparted by a first delay unit to generate a first delay signal; processing the first generated microphone signal by combining with the first delay signal to generate a first electrical output signal, which is converted to an acoustic signal supplied to a wearer of the hearing device; delaying the second generated microphone signal by a second delay time imparted by a second delay unit to generate a second delay signal, the second delay time having a value different than a value of the first delay time; processing the first generated microphone signal by combining with the second delay signal to generate a second electrical output signal; recording respective electrical powers of the first and second electrical output signals over an extended time period, the extended time period being at least several hours; determining which of the first and second electrical output signals contains a lower amount of power; if the second electrical output signal contains a lower amount of power than the first electrical output signal, replacing the value of the first delay time in the first delay unit with the value of the second delay time; further replacing the value of the second delay time in the second delay unit with a third delay time having a value and/or polarity different than the respective values and/or polarities of the first and second delay times; iteratively performing over a further period of time the recording, the determining and the replacing for minimizing an amount of power in the first electrical output signal, which is converted to the acoustic signal supplied to the wearer of the hearing device.