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1. (WO2019006059) CODAGE DE SON RÉFLEXE OLIVO-COCHLÉAIRE MÉDIAL AVEC NORMALISATION DE BANDE PASSANTE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

What is claimed is:

1. A signal processing system for signal processing in a bilateral hearing implant system having left side and right side hearing implants, the system for each hearing implant comprising:

at least one sensing microphone configured for sensing a sound environment to

develop a corresponding microphone signal output;

a filter bank configured for processing the microphone signal to generate a plurality of band pass signals, wherein each band pass signal represents an associated band of audio frequencies;

a channel compression module configured to develop an inhibition-adjusted band pass signal for each band pass signal using a channel-specific dynamic inhibition adjustment based on a channel-normalized medial olivocochlear reflex model reflecting bandwidth energy for a corresponding contralateral band pass signal and bandwidth energy for a selected reference contralateral band pass signal; a pulse timing and coding module configured for processing the inhibition-adjusted band pass signals to develop stimulation timing signals; and

a pulse generation module configured for processing the stimulation timing signals to develop electrode stimulation signals for the hearing implant for perception as sound.

2. The system according to claim 1 , wherein the medial olivocochlear reflex model is configured to produce equal or larger channel-specific dynamic inhibition adjustments for lower frequency band pass signals.

3. The system according to claim 1 , wherein the channel compression module is

ln(l+ c-x) configured to use a channel-specific dynamic inhibition adjustment function y = 1η(-1+^ , where x represents amplitude of the input band pass signal, y represents amplitude of the adjusted band pass signal, and c is a dynamically determined inhibition factor that determines amount of the inhibition adjustment.

4. The system according to claim 3, wherein x and y range within an interval [0, 1].

5. The system according to claim 3, wherein the dynamically determined inhibition factor c and the bandwidth energy for the corresponding contralateral band pass signal are inversely related such that the greater the bandwidth energy for the corresponding contralateral band pass signal, the smaller the value of the dynamically determined inhibition factor c.

6. The system according to claim 1 , wherein the bandwidth energy for the corresponding contralateral band pass signal is based on root mean square output amplitude integrated over a preceding exponentially decaying time window with two time constants, ¾ and ¾.

7. The system according to claim 1 , wherein the pulse timing and coding module is configured to use a continuous interleaved sampling (CIS) or Channel Specific Sampling Sequences (CSSS) based or Fine Structure Processing (FSP) coding strategy or a combination thereof to develop the stimulation timing signals.

8. A method for signal processing in a bilateral hearing implant system having left side and right side hearing implants, the method for each hearing implant comprising:

sensing a sound environment with at least one sensing microphone to develop a

corresponding microphone signal output;

processing the microphone signal with a filter bank to generate a plurality of band pass signals, wherein each band pass signal represents an associated band of audio frequencies;

developing an inhibition-adjusted band pass signal for each band pass signal using a channel-specific dynamic inhibition adjustment based on a channel-normalized medial olivocochlear reflex model reflecting bandwidth energy for a corresponding contralateral band pass signal and bandwidth energy for a selected reference contralateral band pass signal;

processing the inhibition-adjusted band pass signals with a pulse timing and coding module to develop stimulation timing signals; and

processing the stimulation timing signals with a pulse generation module to develop electrode stimulation signals for the hearing implant.

9. The method according to claim 8, wherein the medial olivocochlear reflex model is configured to produce equal or larger channel-specific dynamic inhibition adjustments for lower frequency band pass signals.

10. The method according to claim 8, wherein developing the inhibition-adjusted band pass signals includes using a channel-specific dynamic inhibition adjustment function y where x represents amplitude of the input band pass signal, y represents

amplitude of the adjusted band pass signal, and c is a dynamically determined inhibition factor that determines amount of the inhibition adjustment.

11. The method according to claim 10, wherein x and y range within an interval [0, 1].

12. The method according to claim 10, wherein the dynamically determined inhibition factor c and the bandwidth energy for the corresponding contralateral band pass signal are inversely related such that the greater the bandwidth energy for the corresponding contralateral band pass signal, the smaller the value of the dynamically determined inhibition factor c.

13. The method according to claim 8, wherein the bandwidth energy for the corresponding contralateral band pass signal is based on root mean square output amplitude integrated over a preceding exponentially decaying time window with two time constants, ¾ and ¾.

14. The method according to claim 8, wherein a continuous interleaved sampling (CIS) or Channel Specific Sampling Sequences (CSSS) based or Fine Structure Processing (FSP) coding strategy or a combination thereof is used by the pulse timing and coding module to develop the stimulation timing signals.