Distributed audio coding for wireless hearing aids
First Claim
1. Method for computing inter-channel level differences from a first audio source signal x1 and a second source signal x2, the first source signal x1 being wired with a first processing module PM1 and the second source signal x2 being wired with a second processing module PM2, the second processing module PM2 receiving wirelessly information from the first processing module PM1, this method comprising the steps of:
- (a) acquiring first samples of the first sound signal x1 by the first processing module PM1,(b) defining a first time frame comprising several acquired samples of the first source signal,(c) converting the first time frame into first frequency bands,(d) grouping the first frequency bands into at least two first frequency sub-bands,(e) calculating a first power estimate of each first frequency sub-bands,(f) encoding the first power estimates and transmitting the encoded first power estimates to the second processing module PM2,(g) acquiring second samples of the second sound signal x2 by the second processing module PM2,(h) defining a second time frame comprising several acquired samples of the second source signal,(i) converting the second time frame into second frequency bands,(j) grouping the second frequency bands into at least two second frequency sub-bands,(k) calculating a second power estimate of each second frequency sub-bands,(l) receiving and decoding the encoded first power estimates,(m) computing for each frequency sub-band, an inter-channel level difference by subtracting the first decoded power estimates and the second power estimates.
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Abstract
The aim of the invention is to provide inter-channel level differences ICLD related to audio signals for hearing aids. This aim is achieved by a method for computing ICLD from a first and second audio source signals, the first source signal being wired with a first processing module and the second source signal being wired with a second processing module, the second processing module receiving wirelessly information from the first processing module, this method comprising the steps of: acquiring first samples of the first sound signal by the first processing module, defining a first time frame, converting the first time frame into first frequency bands and grouping them into two first frequency sub-bands, calculating a first power estimate of each first frequency sub-bands, encoding and transmitting same to the second processing module, acquiring second samples of the second sound signal by the second processing module,
defining a second time frame comprising acquired samples, converting same into second frequency bands, grouping them into two second frequency sub-bands,
calculating a second power estimate of each second frequency sub-bands, receiving and decoding the encoded first power estimates, computing for each frequency sub-band, an ICLD by subtracting the first decoded power estimates and the second power estimates.
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Citations
5 Claims
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1. Method for computing inter-channel level differences from a first audio source signal x1 and a second source signal x2, the first source signal x1 being wired with a first processing module PM1 and the second source signal x2 being wired with a second processing module PM2, the second processing module PM2 receiving wirelessly information from the first processing module PM1, this method comprising the steps of:
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(a) acquiring first samples of the first sound signal x1 by the first processing module PM1, (b) defining a first time frame comprising several acquired samples of the first source signal, (c) converting the first time frame into first frequency bands, (d) grouping the first frequency bands into at least two first frequency sub-bands, (e) calculating a first power estimate of each first frequency sub-bands, (f) encoding the first power estimates and transmitting the encoded first power estimates to the second processing module PM2, (g) acquiring second samples of the second sound signal x2 by the second processing module PM2, (h) defining a second time frame comprising several acquired samples of the second source signal, (i) converting the second time frame into second frequency bands, (j) grouping the second frequency bands into at least two second frequency sub-bands, (k) calculating a second power estimate of each second frequency sub-bands, (l) receiving and decoding the encoded first power estimates, (m) computing for each frequency sub-band, an inter-channel level difference by subtracting the first decoded power estimates and the second power estimates. - View Dependent Claims (2, 3, 4, 5)
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Specification