HEARING AID WITH BEAM FORMING PROPERTIES

摘要

The invention relates to a hearing aid with beam forming properties, having at least two microphone channels (1a, 1b) for at least two microphones (2a, 2b), said microphone channels comprising each an analog to digital converter (3a, 3b) and having at least one programmable or program controlled signal processor (5), as well as a digital to analog converter, and at least one receiver and a battery for power supply. The invention particularly comprises in each microphone channel (1a, 1b) a sigma-delta-type analog to digital converter (3a, 3b) including a digital low pass filter and a decimator (4) for converting a 1 Bit Stream of a high clock frequency into a digital word sequence of a lower clock frequency. 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 at least one signal processor (5). Preferably the delay device (6) is integrated into said sigma-delta-ADC (3).