Hearing aid, a method of controlling a hearing aid, and a noise reduction system for a hearing aid

A hearing aid comprising

• a front microphone for outputting a front signal Xfront;
• a back microphone for outputting a back signal Xback;
• a set of frequency band filters for splitting said front signal Xfront and said back signal Xback into respective input channel signals;
• a set of channel delay processors for separately processing respective input channel signals according to respective channel parametric inputs and for outputting respective directionally processed channel signals according to the formula;
• Y=Xfront*(1−omni*e−jωT)+Xback*(omni−e−jωT)
• where omni is a parametric input and T is a predetermined acoustic delay;
• a combining unit for combining said directionally processed channel signals to provide a combined, processed, signal;
• and
• a set of parameter controllers for separately processing respective directionally processed channel signals and for setting respective channel values of the parametric input omni suitable for minimizing said directionally processed signal.

A hearing aid comprising

• a front microphone for outputting a front signal Xfront;
• a back microphone for outputting a back signal Xback;
• a set of frequency band filters for splitting said front signal and said back signal into a set of front input channel signals and a set back channel signals;
• a set of channel delay processors for separately processing said front input channel signals and said back input channel signals according to respective parametric inputs and for outputting a set of directionally processed channel signals, each according to the formula:
• Y=Xfront*(1−omni*e−jωT)+Xback*(omni−e−jωT)
• where omni is a parameter of a respective channel and T is a predetermined acoustic delay;
• a set of parameter controllers for separately processing respective directionally processed channel signals and outputting respective channel parameters;
• and
• a combining unit for combining said directionally processed channel signals to provide a combined directionally processed signal.

A method of controlling a hearing aid, comprising

• providing from a front microphone a front signal Xfront;
• providing from a rear microphone a back signal Xback;
• processing in a delay processor the front signal Xfront and the back signal Xback according to a parametric input omni for outputting a directionally processed signal according to the formula:
• Y=Xfront*(1−omni*e−jωT)+Xback*(omni−e−jωT)
• where omni is a parametric input and T is a predetermined acoustic delay;
• estimating said directionally processed signal;
• and
• setting a value of the parametric input omni suitable for minimizing said directionally processed signal.

A method of controlling a hearing aid, comprising

• providing from a front microphone a front signal Xfront;
• providing from a rear microphone a back signal Xback;
• splitting the front signal Xfront and the back signal Xback according to frequency into respective band-limited signals,
• processing in a delay processor the band-limited signals with respective channel delay processors to produce output signals in respective frequency bands according to respective channel values of a parametric input omni for outputting directionally processed signals in respective bands according to the formula:
• Y=Xfront*(1−omni* e−jωT)+Xback*(omni−e−jωT)
• where omni is a parameter of a respective channel and T is a predetermined acoustic delay;
• estimating said directionally processed signal;
• and
• setting respective channel values of the parametric input omni suitable for minimizing said directionally processed signal.