Patent ID: 9124985
Filing Date: 2015-09-01
Classification: H04R

Abstract:
1. A hearing aid for automatically controlling directivity, the hearing aid comprising: a first input unit that senses a sound to thus generate a first audio signal, and amplifies the first audio signal in response to a first amplification control signal, to then output a first input signal; at least one second input unit that senses the sound to thus generate a second audio signal, and amplifies and delays the second audio signal in response to at least one second amplification control signal and at least one delay time control signal, to then output a second input signal; a subtraction unit having at least one subtractor that is configured in a multi-stage of the same number as that of the at least one second input unit, and that subtracts the second input signal output from a corresponding second input unit among the at least one second input unit from a cumulative subtraction signal output from a preceding stage, to thus output the cumulative subtraction signal; a directivity controller that receives the cumulative subtraction signal output from a last stage subtractor among the at least one subtractor, performs a filtering of the received signal to thus extract a speech sound signal, compares the maximum value of the extracted speech sound signal with a predetermined threshold value, and controls the first amplification control signal, the at least one second amplification control signal, and the at least one delay time control signal, to thus output the controlled result; and an output unit that receives and amplifies the cumulative subtraction signal output from the last stage subtractor among the at least one subtractor, wherein the directivity controller comprises: wherein the filter unit comprises: