Widex A/s

Carsten Paludan-Mueller

Carl Ludvigsen

Anne Vikar Damsgaard

In a method and hearing aid () for processing sound signals for hearing impaired persons by providing multi-band compression processing an input sound signal is filtered by a band split filter () into a number of frequency bands to obtain band split signals. A signal level for each of the band split signals is determined and the frequency bands are arranged into a number of groups. Based on the signal levels in each of the groups, a compressor input level for a number of band split compressors each associated to one of the frequency bands is calculated. A compressor gain for each band split compressor is determined based on the corresponding compressor input signal and the band split signals are amplified with the corresponding compressor gain and summed in a summing unit () to produce an output sound signal.

Method and apparatus for controlling band split compressors in a hearing aid

In a hearing aid signal processor with AGC in at least three processing channels (a, B, C) for different frequency bands and with noise squelching capability to affect the gain control in a t least a lowest frequency band (A) and one intermediate frequency band (B) speech signals components in the intermediate frequency band of an input signal including background noise are intensified by estimation of the content of speech signal components in at least the highest frequency band (C) and modification of the gain adjustment cause by noise squelching in the intermediate frequency band (B) to reduce the noise spending.

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Olystykke, Denmark

Carsten Paludan-Mueller