Frequency Compression and Frequency Shifting for the Hearing Impaired

F.J. Fraga and A.M. Marotta (Brazil)


digital hearing aids, frequency lowering


A considerable percentage of listeners with severe hearing loss have audiograms where the losses are high for high frequencies and low for low frequencies. For these patients, lowering the speech spectrum to the frequencies where there is some residual hearing could be a good solution to be implemented for digital hearing aids. In this paper we have presented two different frequency lowering algorithms: frequency compression and frequency shifting. Results of subjective intelligibility tests have shown a slight better performance of the frequency shifting method relatively to the frequency compression method, although their performance remarkably depends on which are the specific phonemes that are being processed by these two algorithms.

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