Patent ID: 8442247
Filing Date: 2013-05-14
Classification: H04R

Abstract:
1. A hearing aid system, comprising: an input transducer inside a hearing aid for converting an input sound signal into an electrical input signal, the input sound signal including an information signal part of a known waveform and a background noise part; an A/D converter for converting the electrical input signal to a digital input signal; a signal path including a signal processing unit for processing the digital input signal to at least adapt the digital input signal to a hearing profile of a user of the hearing aid, the signal processing unit providing a processed output signal; an output transducer configured to convert a digital or analogue electrical output signal to an output sound signal; a signal generator inside the hearing aid configured to generate a predefined source signal, the predefined source signal being added to an output of the signal processing unit or being directly provided as input of the output transducer; a matched filter matched to the known waveform receiving said electrical input signal in analogue or digital form, the matched filter configured to improve the identification of the information signal part of the known waveform from the noisy input signal; and an adder configured to add the source signal to the output of the signal processing unit, wherein the information signal part of the known waveform is generated by said signal generator.