| 摘要 |
A hearing aid ( 50 ) comprises means ( 55, 56, 57, 58 ) for reproducing frequencies above the upper frequency limit of a hearing impaired user. The hearing aid ( 50 ) according to the invention comprises means ( 55, 57 ) for transposing higher bands of frequencies from outside the upper frequency limit of a hearing impaired user down in frequency based on a detected frequency in order to coincide with a lower band of frequencies within the frequency range perceivable by the hearing impaired user. The transposing means ( 55, 57 ) comprise an adaptive notch filter ( 15 ) for detecting a dominant frequency in the lower band of frequencies, adaptation means ( 16 ) controlled by the adaptive notch filter ( 15 ), an oscillator ( 3 ) controlled by the adaptation means ( 16 ), and a multiplier ( 4 ) for performing the actual frequency transposition of the signal. The invention further provides a method for processing a signal in a hearing aid.
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