Patent ID: 6339647
Filing Date: 2002-01-15
Classification: H04R

Abstract:
Hearing aid with beam forming properties, comprising at least two microphone channels (1a, 1b) for at least two microphones (2a, 2b), a digital programmable or program controlled signal processor (6), a receiver and a battery for power supply, wherein each microphone channel (1a, 1b) contains a sigma-delta-type analog to digital converter (3a, 3b), a digital low pass filter and decimator (4) for converting a 1 Bit stream of a high clock frequency of said converter into a digital word sequence of a lower clock frequency, and at least one of said at least two microphone channels contains a controllable delay device (6) connected to the input side of the respective digital low pass filter and decimator (4) of said channel, said delay device (6) being controllable by said processor (5).