Patent ID: 9699571
Date: 2017-07-04
CPC Classifications: H04R

Claim:
1. A hearing aid system comprising an acoustical-electrical transducer adapted for converting an acoustical input sound into an electrical audio signal; a noise generator; a signal splitter configured to split a noise generator output signal in at least N parallel branches; N band-pass filters wherein each of said N branches comprises one of said N band-pass filters; a level modulator adapted to control a level of the output signal from the band-pass filters, hereby providing level modulated band-pass filter output signals and further adapted to increase the level of the output signal from one of the band-pass filters while decreasing the level of the output signal from another one of the band-pass filters; a first summer adapted to sum the level modulated band-pass filter output signals from said N branches hereby providing a sound enriched sound signal; a harmonic controller adapted to set a center frequency of the band-pass filters in accordance with a predetermined musical scale and such that at least N−1 of the band-pass filter center frequencies are selected from N−1 different predetermined frequency intervals, and adapted to change the center frequency of at least one of the band-pass filters, in response to a trigger event; a timing controller adapted to trigger the harmonic controller means to change the center frequency of at least one of the band-pass filters in response to the event that the level modulator has increased a peak level of the output signal from one of the band-pass filters to a first predetermined level, or has decreased the peak level of the output signal from one of the band-pass filters to a second predetermined level; a second summer for adding the sound enriched signal to the electrical audio signal hereby providing an electrical input signal; a signal processor configured to amplify the electrical input signal in order to alleviate a hearing loss of a hearing aid user, hereby providing an electrical output signal; and an electrical-acoustical output transducer for converting the electrical output signal into sound.