Hearing device comprising adaptive sound source frequency lowering

A hearing device adapted to be worn at or in an ear of a user, or adapted to be fully or partially implanted in the head of the user, the hearing device comprising

• an input unit for providing at least one electric input signal representing sound in a frequency sub-band representation (k, m), where k and m are frequency and time indices, respectively,
• an SNR estimation unit for estimating a signal to noise ratio and/or a level estimation unit for estimating a level of said at least one electric input signal, or a signal or signals derived therefrom, in said frequency sub-band representation,
• and a configurable frequency transposition unit for transposing content of a source frequency sub-band FBs into a destination frequency sub-band FBD so that the contents of the resulting destination frequency sub-band is determined as a weighted combination of the contents of the source and destination frequency sub-bands according to the expression
• PDmod=αPD+βPS
• or
• MAGDmod=αMAGD+βMAGS
• wherein PD and MAGD are the unmodified power spectrum and magnitude, respectively, of the destination frequency sub-band before frequency transposition, PS and MAGS are the power spectrum and magnitude, respectively, of the source frequency sub-band, and PDmod and MAGDmod are the resulting power spectrum and magnitude, respectively, in the resulting destination sub-band after the frequency transposition, and the parameters a and are destination and source band weight factors, respectively, that specify details of the frequency transposition operation, and wherein
• said configurable frequency transposition unit is configured to determine at least one of said weight factors α and β in dependence of said estimate of signal to noise ratio and/or said estimate of level of said at least one electric input signal, or a signal or signals derived therefrom.