A method of determining parameters of a BTE hearing aid having at least one ITE microphone and at least one BTE microphone, the method includes: determining Head-Related Transfer functions HRTFl(ƒ); determining a hearing aid related transfer function Hl,iITEC(ƒ) of a ith microphone of the at least o
A method of determining parameters of a BTE hearing aid having at least one ITE microphone and at least one BTE microphone, the method includes: determining Head-Related Transfer functions HRTFl(ƒ); determining a hearing aid related transfer function Hl,iITEC(ƒ) of a ith microphone of the at least one ITE microphone for direction l; determining a hearing aid related transfer functions Hl,jBTEC(ƒ) of a jth microphone of the at least one BTE microphone; determining transfer functions GiIEC(ƒ) of a ith cue filter of at least one cue filter filtering audio sound signals of the at least one ITE microphone; and determining transfer functions GjBTEC(ƒ) of a jth cue filter of the at least one cue filter filtering audio sound signals of the at least one BTE microphone; wherein the transfer functions GiIEC(ƒ) and the transfer functions GjBTEC(ƒ) are determined using a processing unit based on equation: minGiIEC(ƒ),GiBTEC(ƒ)Σl=0L-1W(l)∥W(ƒ)HRTFl(ƒ)−ΣiGiIEC(ƒ)Hl,iIEC(ƒ)−ΣjGjBTEC(ƒ)Hl,jBTEC(ƒ))∥p.
대표청구항▼
1. A method of determining parameters of a behind-the-ear (BTE) hearing aid having at least one in-the-ear (ITE) microphone and at least one BTE microphone, the method comprising: determining transfer functions that include spatial cues;determining a hearing aid related transfer function Hl,iIEC(ƒ)
1. A method of determining parameters of a behind-the-ear (BTE) hearing aid having at least one in-the-ear (ITE) microphone and at least one BTE microphone, the method comprising: determining transfer functions that include spatial cues;determining a hearing aid related transfer function Hl,iIEC(ƒ) of a ith microphone of the at least one ITE microphone for direction l;determining a hearing aid related transfer functions Hl,jBTEC(ƒ) of a jth microphone of the at least one BTE microphone;determining transfer functions GiIEC(ƒ) of a ith cue filter of at least one cue filter filtering audio sound signals of the at least one ITE microphone; anddetermining transfer functions GjBTEC(ƒ) of a ith cue filter of the at least one cue filter filtering audio sound signals of the at least one BTE microphone;wherein the transfer functions GiIEC(ƒ) and the transfer functions GjBTEC(ƒ) are determined using a processing unit in the BTE hearing aid, the processing unit configured to solve a minimization problem based on the transfer functions that include the spatial cues, the hearing aid related transfer function Hl,iIEC(ƒ), and the hearing aid related transfer function Hl,jBTEC(ƒ). 2. The method according to claim 1, further comprising: determining a transfer function HFB,iIEC(ƒ) of a feedback path associated with the ith microphone of the at least one ITE microphone; anddetermining a transfer function HFB,jBTEC(ƒ) of a feedback path associated with the jth microphone of the at least one BTE microphone. 3. The method according to claim 2, further comprising: determining filter coefficients of the at least one cue filter associated with the at least one ITE microphone, and filter coefficients of the at least one cue filter associated with the at least one BTE microphone by solving: minGiIEC(f),GiBTEC(f)∑l=0L-1W(l)W(f)(HRTFl(f)-∑iGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))psubjectto1∑iGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)≥MSG(f). wherein MSG(f) is a maximum stable gain, or by solving: minGiIEC(f),GjBTEC(f)(∑l=0L-1W(l)W(f)(HRTFl(f)-∑iGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))p+α∑iGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)p) wherein α is a weighting factor balancing spatial cue accuracy and feedback performance, p is an integer, W(l) is angular weight(s), and W(ƒ) is frequency weight(s). 4. The method according to claim 2, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the Head-Related Transfer functions HRTFl(ƒ) are determined using a hearing aid related transfer function Hl,refITEC(ƒ), and wherein filter coefficients of the at least one cue filter filtering audio sound signals of the at least one ITE microphone, and filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone are determined by solving equation: minGiIEC(f),GiBTEC(f)∑l=0L-1W(l)W(f)(Hl,refITEC(f)-∑i≠refGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))psubjectto1∑i≠refGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)≥MSG(f) wherein MSG(f) is a maximum stable gain, p is an integer, W(l) is angular weight(s), and W(ƒ) is frequency weight(s). 5. The method according to claim 2, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the Head-Related Transfer functions HRTFl(ƒ) are determined using a hearing aid related transfer function Hl,refITEC(ƒ), and wherein filter coefficients of the at least one cue filter filtering audio sound signals of the at least one ITE microphone, and filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone are determined by solving equation: minGiIEC(f),GjBTEC(f)(∑l=0L-1W(l)W(f)(Hl,refITEC(f)-∑i≠refGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))p+α∑i≠refGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)p) wherein α is a weighting factor balancing spatial cue accuracy and feedback performance, p is an integer, W(l) is angular weight(s), and W(ƒ) is frequency weight(s). 6. The method according to claim 1, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the acts of determining the Head-Related Transfer functions HRTFl(ƒ), the hearing aid related transfer function Hl,iIEC(ƒ), and the hearing aid related transfer functions Hl,iBTEC(ƒ) are performed with the hearing aid mounted on an artificial head. 7. The method according to claim 1, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the acts of determining the Head-Related Transfer functions HRTFl(ƒ), the hearing aid related transfer function Hl,iIEC(ƒ), and the hearing aid related transfer functions Hl,iBTEC(ƒ) are performed for a number of users; andwherein filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone are determined based on an average value of the Head-Related Transfer functions HRTFl(ƒ), an average value of the hearing aid related transfer function Hl,iITEC(ƒ), and an average value of the hearing aid related transfer functions Hl,iBTEC(ƒ), of the number of users. 8. The method according to claim 1, wherein the hearing aid has a plurality of frequency channels; and wherein filter coefficients of the at least one cue filter filtering audio sound signals of the at least one ITE microphone, and filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone are determined in one or more of the frequency channels. 9. The method according to claim 8, further comprising disconnecting the at least one BTE microphone in one or more of the frequency channels so that hearing loss compensation is performed solely on an output of the at least one ITE microphone. 10. The method according to claim 1, further comprising generating a hearing loss compensated output signal based on a combination of filtered audio sound signals output by the at least one cue filter filtering audio sound signals of the at least one ITE microphone, or by the at least one cue filter filtering audio sound signals of the at least one BTE microphone, or by both. 11. The method according to claim 1, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ) and the minimization problem is based on the equation: minGiIEC(f),GiBTEC(f)∑l=0L-1W(l)W(f)(HRTFl(f)-∑iGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))p wherein W(l) is an angular weighting factor,W(ƒ) is a frequency dependent weighting factor, and p is a positive integer. 12. The method according to claim 11, wherein W(l)=1. 13. The method according to claim 11, wherein W(ƒ)=1. 14. The method according to claim 11, wherein p=2. 15. An apparatus for determining parameters of a behind-the-ear (BTE) hearing aid having at least one in-the-ear (ITE) microphone and at least one BTE microphone, the apparatus comprising a processing unit, wherein the processing unit comprises at least some hardware and is configured for: determining transfer functions that include spatial cues;determining a hearing aid related transfer function Hl,iIEC(ƒ) of a ith microphone of the at least one ITE microphone for direction l;determining a hearing aid related transfer functions Hl,jBTEC(ƒ) of a jth microphone of the at least one BTE microphone;determining transfer functions GiIEC(ƒ) of a ith cue filter of at least one cue filter filtering audio sound signals of the at least one ITE microphone; anddetermining transfer functions GjBTEC(ƒ) of a jth cue filter of the at least one cue filter filtering audio sound signals of the at least one BTE microphone;wherein the processing unit is configured for determining the transfer functions GiIEC(ƒ) and the transfer functions GjBTEC(ƒ) by solving a minimization problem based on the transfer functions that include the spatial cues, the hearing aid related transfer function Hl,iIEC(ƒ), and the hearing aid related transfer function Hl,jBTEC(ƒ). 16. The apparatus according to claim 15, wherein the processing unit is further configured for: determining a transfer function HFB,iIEC(ƒ) of a feedback path associated with the ith microphone of the at least one ITE microphone; anddetermining a transfer function HFB,jBTEC(ƒ) of a feedback path associated with the jth microphone of the at least one BTE microphone. 17. The apparatus according to claim 16, wherein the processing unit is further configured for: determining filter coefficients of the at least one cue filter associated with the at least one ITE microphone, and filter coefficients of the at least one cue filter associated with the at least one BTE microphone by solving: minGiIEC(f),GiBTEC(f)∑l=0L-1W(l)W(f)(HRTFl(f)-∑iGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))psubjectto1∑iGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)≥MSG(f) wherein MSG(f) is a maximum stable gain, or by solving: minGiIEC(f),GjBTEC(f)(∑l=0L-1W(f)(HRTFl(f)-∑iGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))p+α∑iGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)p) wherein α is a weighting factor balancing spatial cue accuracy and feedback performance, p is an integer, W(l) is angular weight(s), and W(ƒ) is frequency weight(s). 18. The apparatus according to claim 16, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the Head-Related Transfer functions HRTFl(ƒ) are based on a hearing aid related transfer function Hl,refITEC(ƒ), and wherein the processing unit is configured to determine filter coefficients of the at least one cue filter filtering audio sound signals of the at least one ITE microphone, and filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone by solving equation: minGiIEC(f),GiBTEC(f)∑l=0L-1W(l)W(f)(Hl,refITEC(f)-∑i≠refGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))psubjectto1∑i≠refGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)≥MSG(f) wherein MSG(f) is a maximum stable gain, p is an integer, W(l) is angular weight(s), and W(ƒ) is frequency weight(s). 19. The apparatus according to claim 16, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the Head-Related Transfer functions HRTFl(ƒ) are based on a hearing aid related transfer function Hl,refITEC(ƒ), and wherein the processing unit is configured to determine filter coefficients of the at least one cue filter filtering audio sound signals of the at least one ITE microphone, and filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone by solving equation: minGiIEC(f),GjBTEC(f)(∑l=0L-1W(l)W(f)(Hl,refITEC(f)-∑i≠refGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))p+α∑i≠refGiIEC(f)HFB,iIEC(f)+∑jGjBTEC(f)HFB,jBTEC(f)p) wherein α is a weighting factor balancing spatial cue accuracy and feedback performance, p is an integer, W(l) is angular weight(s), and W(ƒ) is frequency weight(s). 20. The apparatus according to claim 15, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ); and wherein the processing unit is configured for determining the Head-Related Transfer functions HRTFl(ƒ), the hearing aid related transfer function Hl,iIEC(ƒ), and the hearing aid related transfer functions HRTFl,iBTEC(ƒ) with the hearing aid mounted on an artificial head. 21. The apparatus according to claim 15, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ) and wherein the processing unit is configured for determining the Head-Related Transfer functions HRTFl(ƒ), the hearing aid related transfer function Hl,iIEC(ƒ), and the hearing aid related transfer functions Hl,iBTEC(ƒ) for a number of users; andwherein the processing unit is configured to determine filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone based on an average value of the Head-Related Transfer functions HRTFl(ƒ), an average value of the hearing aid related transfer function Hl,iITEC(ƒ), and an average value of the hearing aid related transfer functions Hl,iBTEC(ƒ), of the number of users. 22. The apparatus according to claim 15, wherein the BTE hearing aid has a plurality of frequency channels; and wherein the processing unit is configured for determining filter coefficients of the at least one cue filter filtering audio sound signals of the at least one ITE microphone, and filter coefficients of the at least one cue filter filtering audio sound signals of the at least one BTE microphone, in one or more of the frequency channels. 23. The apparatus according to claim 22, wherein the processing unit is further configured for disconnecting the at least one BTE microphone in one or more of the frequency channels so that hearing loss compensation is performed solely on an output of the at least one ITE microphone. 24. The apparatus according to claim 15, wherein the processing unit is further configured for generating a hearing loss compensated output signal based on a combination of filtered audio sound signals output by the at least one cue filter filtering audio sound signals of the at least one ITE microphone, or by the at least one cue filter filtering audio sound signals of the at least one BTE microphone, or by both. 25. The apparatus according to claim 15, wherein the transfer functions that include spatial cues comprise Head-Related Transfer functions HRTFl(ƒ) and the minimization problem is based on the equation: minGiIEC(f),GiBTEC(f)∑l=0L-1W(l)W(f)(HRTFl(f)-∑iGiIEC(f)Hl,iIEC(f)-∑jGjBTEC(f)Hl,jBTEC(f))p wherein W(l) is an angular weighting factor,W(ƒ) is a frequency dependent weighting factor, and p is a positive integer. 26. The apparatus according to claim 25, wherein W(l)=1. 27. The apparatus according to claim 25, wherein W(ƒ)=1. 28. The apparatus according to claim 25, wherein p=2.
Hamacher,Volkmar; Niederdr채nk,Torsten, Hearing aid device, and operating and adjustment methods therefor, with microphone disposed outside of the auditory canal.
Soli Sigfrid D. (Sierra Madre CA) Jayaraman Sriram (Los Angeles CA) Gao Shawn (Cerritos CA) Sullivan Jean (Murrieta CA), Method of signal processing for maintaining directional hearing with hearing aids.
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