Frequency mapping for hearing devices
A hearing device includes: a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal; a processing unit for providing a second audio signal compensating a hearing loss of a user of the hearing aid based on the first audio signal; and a receiver for providing an output sound signal based on the second audio signal; wherein the processing unit comprises a band splitter, a pitch shifter, and a frequency shifter, and wherein the pitch shifter and the frequency shifter are arranged in a first channel for performing frequency mapping.
1. A hearing device comprising:
a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal;
a processing unit for providing a second audio signal compensating a hearing loss of a user of the hearing device based on the first audio signal; and
a receiver for providing an output sound signal based on the second audio signal;
wherein the processing unit comprises a band splitter, and a frequency shifter, and wherein the frequency shifter is arranged in a first channel; and
wherein the processing unit also comprises a time-domain resampler configured to provide up-sampling by inserting data, and a time-domain tempo adjuster coupled directly or indirectly to the time-domain resampler.
2. The hearing device of claim 1 , wherein the time-domain resampler is coupled between the band splitter and the time-domain tempo adjuster.
3. The hearing device of claim 1 , wherein the time-domain tempo adjuster is coupled between the band splitter and the time-domain resampler.
4. The hearing device of claim 1 , wherein the frequency shifter comprises a Hilbert transform module for performing a Hilbert transform.
5. The hearing device of claim 1 , wherein the frequency shifter comprises an amplitude modulator and one or more filters coupled to the amplitude modulator.
6. The hearing device of claim 1 , wherein the frequency shifter is configured to provide frequency shifting by an amount that is for only a subset of frequencies associated with the first audio signal.
7. The hearing device of claim 1 , wherein the frequency shifter is configured to provide an output signal based on an output from the time-domain tempo adjuster.
8. The hearing device of claim 1 , wherein the frequency shifter is configured to provide an output signal based on an output from the time-domain resampler.
9. The hearing device of claim 1 , wherein the frequency shifter comprises a Hilbert transform module; and
wherein the processing unit further includes a phase rotation module.
10. The hearing device of claim 9 , wherein the time-domain resampler, the Hilbert transform module, the time-domain tempo adjuster, and the phase rotation module are coupled in series according to the following order: (1) the time-domain resampler, (2) the time-domain tempo adjuster, (3) the Hilbert transform module, and (4) the phase rotation module.
11. The hearing device of claim 10 , wherein the frequency shifter comprises a first Hilbert transform module; and
wherein the processing unit further includes a phase rotation module, and a second Hilbert transform module; and
wherein the time-domain resampler, the first Hilbert transform module, the second Hilbert transform module, the time-domain tempo adjuster, and the phase rotation module are coupled in series according to the following order: (1) the first Hilbert transform module, (2) the time-domain tempo adjuster, (3) the time-domain resampler, (4) the second Hilbert transform module, and (5) the phase rotation module.
12. The hearing device of claim 9 , wherein the time-domain resampler, the Hilbert transform module, the time-domain tempo adjuster, and the phase rotation module are coupled in series according to the following order: (1) the t time-domain empo adjuster, (2) the time-domain resampler, (3) the Hilbert transform module, and (4) the phase rotation module.
13. The hearing device of claim 9 , wherein the time-domain resampler, the Hilbert transform module, the time-domain tempo adjuster, and the phase rotation module are coupled in series according to the following order: (1) the time-domain resampler, (2) the Hilbert transform module, (3) the time-domain tempo adjuster, and (4) the phase rotation module.
14. The hearing device of claim 9 , wherein the time-domain resampler, the Hilbert transform module, the time-domain tempo adjuster, and the phase rotation module are coupled in series according to the following order: (1) the time-domain resampler, (2) the Hilbert transform module, (3) the phase rotation, and (4) the time-domain tempo adjuster.
15. The hearing device of claim 9 , wherein the time-domain resampler, the Hilbert transform module, the time-domain tempo adjuster, and the phase rotation module are coupled in series according to the following order: (1) the Hilbert transform module, (2) the phase rotation, (3) the time-domain tempo adjuster, and (4) the time-domain resampler.
16. The hearing device of claim 1 , wherein the band splitter and the frequency shifter are configured to perform signal processing for frequency mapping in a time domain.
17. The hearing device of claim 1 , wherein the band splitter is configured to provide a first output in the first channel for processing to achieve the first frequency mapping, and a second output in a second channel for processing to achieve a second frequency mapping.
18. The hearing device of claim 1 , wherein the band splitter is configured to provide a first output for processing in the first channel, a second output for processing in a second channel, and a third output for processing in a third channel.
19. The hearing device of claim 1 , wherein the microphone, the processing unit, and the receiver are parts of a behind-the-ear (BTE) hearing aid, an in-the-ear (ITE) hearing aid, an in-the-canal (ITC) hearing aid, or a binaural hearing aid system.
20. The hearing device of claim 1 , wherein the time-domain resampler is a part of a pitch shifter, and is configured to provide the up-sampling in one or more stages.
21. The hearing device of claim 1 , wherein the time-domain resampler is also configured to provide down-sampling.
22. The hearing device of claim 1 , wherein an amount of the up-sampling is variable.
23. The hearing device of claim 1 , wherein the processing unit is configured to provide up-sampling in multiple stages.
24. The hearing device of claim 1 , wherein the processing unit is configured to provide anti-aliasing.
25. The hearing device of claim 1 , wherein the processing unit is configured to provide up-sampling using pole(s) and zero(s).
26. A hearing device comprising:
a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal;
a processing unit for providing a second audio signal compensating a hearing loss of a user of the hearing device based on the first audio signal; and
a receiver for providing an output sound signal based on the second audio signal;
wherein the processing unit comprises a band splitter, and a frequency shifter, and wherein the frequency shifter is arranged in a first channel;
wherein the processing unit also comprises a time-domain resampler configured to provide up-sampling in multiple stages; and
wherein the hearing device also comprises a time-domain tempo adjuster coupled directly or indirectly to the time-domain resampler.
27. The hearing device of claim 26 , wherein the time-domain resampler is a part of a pitch shifter, and the hearing device comprises the pitch shifter.
28. A hearing device comprising:
a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal;
a processing unit for providing a second audio signal compensating a hearing loss of a user of the hearing device based on the first audio signal; and
a receiver for providing an output sound signal based on the second audio signal;
wherein the processing unit comprises a band splitter, and a frequency shifter, and wherein the frequency shifter is arranged in a first channel;
wherein the processing unit also comprises a time-domain resampler configured to provide anti-aliasing; and
wherein the hearing device also comprises a time-domain tempo adjuster coupled directly or indirectly to the time-domain resampler.
29. The hearing device of claim 28 , wherein the time-domain resampler is a part of a pitch shifter, and the hearing device comprises the pitch shifter.
30. The hearing device of claim 28 , wherein the time-domain resampler is coupled between the band splitter and the time-domain tempo adjuster.
31. The hearing device of claim 28 , wherein the time-domain tempo adjuster is coupled between the band splitter and the time-domain resampler.
32. The hearing device of claim 28 , wherein the frequency shifter comprises a Hilbert transform module for performing a Hilbert transform.
33. The hearing device of claim 28 , wherein the frequency shifter comprises an amplitude modulator and one or more filters coupled to the amplitude modulator.
34. The hearing device of claim 28 , wherein the frequency shifter is configured to provide frequency shifting by an amount that is for only a subset of frequencies associated with the first audio signal.
35. The hearing device of claim 28 , wherein the frequency shifter is configured to provide an output signal based on an output from the time-domain tempo adjuster.
36. The hearing device of claim 28 , wherein the frequency shifter is configured to provide an output signal based on an output from the time-domain resampler.
37. The hearing device of claim 28 , wherein the frequency shifter comprises a Hilbert transform module; and
wherein the processing unit further includes a phase rotation module.
38. The hearing device of claim 28 , wherein the band splitter and the frequency shifter are configured to perform signal processing for frequency mapping in a time domain.
39. The hearing device of claim 28 , wherein the band splitter is configured to provide a first output in the first channel for processing to achieve the first frequency mapping, and a second output in a second channel for processing to achieve a second frequency mapping.
40. The hearing device of claim 28 , wherein the band splitter is configured to provide a first output for processing in the first channel, a second output for processing in a second channel, and a third output for processing in a third channel.
41. The hearing device of claim 28 , wherein the microphone, the processing unit, and the receiver are parts of a behind-the-ear (BTE) hearing aid, an in-the-ear (ITE) hearing aid, an in-the-canal (ITC) hearing aid, or a binaural hearing aid system.
42. A hearing device comprising:
a microphone for reception of sound and conversion of the received sound into a corresponding first audio signal;
a processing unit for providing a second audio signal compensating a hearing loss of a user of the hearing device based on the first audio signal; and
a receiver for providing an output sound signal based on the second audio signal;
wherein the processing unit comprises a band splitter, and a frequency shifter, and wherein the frequency shifter is arranged in a first channel;
wherein the processing unit also comprises a time-domain resampler configured to provide up-sampling using pole(s) and zero(s); and
wherein the hearing device also comprises a time-domain tempo adjuster coupled directly or indirectly to the time-domain resampler.
43. The hearing device of claim 42 , wherein the time-domain resampler is a part of a pitch shifter, and the hearing device comprises the pitch shifter.
44. The hearing device of claim 42 , wherein the time-domain resampler is coupled between the band splitter and the time-domain tempo adjuster.
45. The hearing device of claim 42 , wherein the time-domain tempo adjuster is coupled between the band splitter and the time-domain resampler.
46. The hearing device of claim 42 , wherein the frequency shifter comprises a Hilbert transform module for performing a Hilbert transform.
47. The hearing device of claim 42 , wherein the frequency shifter comprises an amplitude modulator and one or more filters coupled to the amplitude modulator.
48. The hearing device of claim 42 , wherein the frequency shifter is configured to provide frequency shifting by an amount that is for only a subset of frequencies associated with the first audio signal.
49. The hearing device of claim 42 , wherein the frequency shifter is configured to provide an output signal based on an output from the time-domain tempo adjuster.
50. The hearing device of claim 42 , wherein the frequency shifter is configured to provide an output signal based on an output from the time-domain resampler.
51. The hearing device of claim 42 , wherein the frequency shifter comprises a Hilbert transform module; and
wherein the processing unit further includes a phase rotation module.
52. The hearing device of claim 42 , wherein the band splitter and the frequency shifter are configured to perform signal processing for frequency mapping in a time domain.
53. The hearing device of claim 42 , wherein the band splitter is configured to provide a first output in the first channel for processing to achieve the first frequency mapping, and a second output in a second channel for processing to achieve a second frequency mapping.
54. The hearing device of claim 42 , wherein the band splitter is configured to provide a first output for processing in the first channel, a second output for processing in a second channel, and a third output for processing in a third channel.
55. The hearing device of claim 42 , wherein the microphone, the processing unit, and the receiver are parts of a behind-the-ear (BTE) hearing aid, an in-the-ear (ITE) hearing aid, an in-the-canal (ITC) hearing aid, or a binaural hearing aid system.