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AssigneePhonak AG
InventorsSilvia Allegro, Olegs Timms, Adam Hersbach, Hugh McDermott, Evert Dijkstra
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A method for frequency transposition in a communication device Or a hearing device, respectively, is disclosed by transforming an acoustical signal into an electrical signal (s) and by transforming the electrical signal from time domain into frequency domain to obtain a spectrum (S). A frequency transposition is being applied to the spectrum (S) in order to obtain a transposed spectrum (S′), whereby the frequency transposition is being defined by a nonlinear frequency transposition function. Thereby, it is possible to transpose lower frequencies almost linearly, while higher frequencies are transposed more strongly. As a result thereof, harmonic relationships are not distorted in the lower frequency range, and at the same time, higher frequencies can be moved to a lower frequency range, namely to an audible frequency range of the hearing impaired person. The transposition scheme can be applied to the complete signal spectrum without the need for switching between non-transposition and transposition processing for different parts of the signal. Therefore, no artifacts due to switching are encountered. A higher transmission quality is obtained because more information is taken into account for the transmission.
A method for frequency transposition in a hearing device or in a communication device, respectively, comprising the steps of transforming an acoustical signal into an electrical signal and transforming the electrical signal from time domain into frequency domain to obtain a spectrum, applying a frequency transposition to the entire spectrum in order to obtain a transposed spectrum as an output signal, wherein the frequency transposition is at least partially defined by a nonlinear frequency transposition function and wherein the electrical signal is not superposed with the output signal.
A device comprising at least one microphone, a transformation unit to transform a time domain input signal into a frequency domain output signal, and a signal processing unit, wherein the transformation unit is operationally connected to the at least one microphone and to the signal processing unit, whereas a nonlinear frequency transposition function is applied to the frequency domain output signal of the transformation unit in the signal processing unit and wherein the time domain input signal is not superposed with the frequency domain output signal.
Dependencies are inferred from the claim text.