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The application relates to a filter bank for an audio processing device, e.g. a hearing aid. The filter bank comprises an analysis filter bank comprising a plurality of M first filters hm(n), where m=0, 1, . . . , M−1 is a frequency band index, n being a time index, the first filters hm(n) having a first filter length of Lhm; a synthesis filter bank comprising a plurality of M second filters gm(n), m=0, 1, . . . , M−1, the second filters gm(n) having second filter lengths of Lgm; the plurality of first and second filters being arranged in pairs, each pair forming a frequency channel. the first filters hm(n) exhibiting a first filter delay τh, the second filters gm(n) exhibiting a second filter delay τg, each of the first filter lengths Lhm and the second filter lengths Lgm is uneven, and wherein the first filters are subject to the constraint that the sum of the first filters hm(n) of the analysis filter bank is a delta function δ(n−τh).

Titel:	DISTORTION FREE FILTER BANK FOR A HEARING DEVICE
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2018
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20180343526 Publication Date: November 29, 2018 Appl. No: 16/038946 Application Filed: July 18, 2018 Assignees: Oticon A/S (Smørum, DK) Claim: 1. A filter bank for an audio processing device, e.g. a hearing aid, the filter bank comprising an analysis filter bank comprising a plurality of M first filters hm(n), where m=0, 1, . . . , M−1 is a frequency band index, n being a time index, the first filters hm(n) having first filter lengths of Lhm; a synthesis filter bank comprising a plurality of M second filters gm(n), m=0, 1, . . . , M−1, the second filters gm(n) having second filter lengths of Lgm; the plurality of first and second filters being arranged in pairs, each pair forming a frequency channel, wherein the first filters hm(n) exhibit a first filter delay τh, the second filters gm(n) exhibit a second filter delay τg, each of the first filter lengths Lhm and the second filter lengths Lgm is uneven, and wherein the first filters are subject to the constraint that the sum of the first filters hm(n) of the analysis filter bank is a delta function, δ(n−τh). Claim: 2. A filter bank according to claim 1 wherein the following constraints on the first filters hm(n) are imposed: [mathematical expression included] Claim: 3. A filter bank according to claim 2 wherein the overall filter bank response t(n), excluding aliasing terms, is subject to the constraint that t(n)=δ(n−τ), where r=τh+τg. Claim: 4. A filter bank according to claim 3 wherein the following constraints on the second filters gm(n) are imposed: [mathematical expression included] Claim: 5. An audio processing device comprising a filter bank according to claim 1. Claim: 6. An audio processing device according to claim 5 comprising a hearing aid, a headset, an earphone, an ear protection device or a combination thereof. Claim: 7. A method of implementing a filter bank for an audio processing device comprising providing an analysis filter bank comprising a plurality of M first filters hm(n), where m=0, 1, . . . , M−1 is a frequency band index, n being a time index, the first filters hm(n) having first filter lengths of Lhm; providing a synthesis filter bank comprising a plurality of M second filters gm(n), m=0, 1, . . . , M−1, the second filters gm(n) having second filter lengths of Lgm; arranging the plurality of first and second filters in pairs, each pair forming a frequency channel, arranging that the first filters hm(n) exhibit a first filter delay τh, arranging that the second filters gm(n) exhibit a second filter delay τg, arranging that each of the first filter lengths Lhm and the second filter lengths Lgm is uneven, and arranging that the first filters are subject to the constraint that the sum of the first filters hm(n) of the analysis filter bank is a delta function, δ(n−τh). Claim: 8. A data processing system comprising a processor and program code means for causing the processor to perform the steps of the method of claim 7. Claim: 9. A tangible computer readable medium storing a computer program comprising program code means for causing a data processing system to perform the steps of the method of claim 7. Current International Class: 04; 04; 04

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DISTORTION FREE FILTER BANK FOR A HEARING DEVICE