The hearing device to be worn by a user of the hearing device comprises an input transducer for transducing incoming acoustical sound into audio signals; a signal processor for processing audio signals; an output transducer for transducing audio signals into outgoing acoustical sound. Said signal processor is designed such that there exists an input SPL range of at least a portion of said incoming acoustical sound, in which an increase in input SPL of said at least one portion of said incoming acoustical sound results in a decrease in output SPL of at least a portion of said outgoing acoustical sound, wherein SPL stands for sound pressure level. Through this, at high input SPL the hearing device's power consumption can be reduced by making use of direct sound, which propagate as sound waves from outside the user's ear canal to the user's ear drum.
1. Hearing device to be worn by a user of the hearing device, comprising
an input transducer for transducing incoming acoustical sound into audio signals;
a signal processor for processing said audio signals or audio signals derived therefrom, and for outputting processed audio signals; and
an output transducer for transducing said processed audio signals or audio signals derived therefrom into outgoing acoustical sound;
wherein said signal processor embodies an open-loop control designed such that there exists an input SPL range of at least a portion of said incoming acoustical sound, in which an increase in input SPL of said at least one portion of said incoming acoustical sound results in a decrease in output SPL of at least a portion of said outgoing acoustical sound;
wherein SPL stands for sound pressure level.
2. Hearing device according to claim 1 , wherein within said input SPL range there exists an input SPL above which the output of said least one portion of said outgoing acoustical sound is muted.
3. Hearing device according to claim 1 , wherein said input SPL range extends from an input threshold SPL to higher SPLs.
4. Hearing device according to claim 3 , wherein said decrease in output SPL is chosen such that an SPL of a superposition of said outgoing acoustical sound and direct sound near the user's ear drum is, within ±6 dB, a constant for input SPLs of said at least one portion of said incoming acoustical sound above said input threshold SPL, as far as the corresponding SPL of said direct sound is not larger than said constant, wherein said direct sound is incoming acoustical sound reaching the user's ear drum.
5. Hearing device according to claim 3 , wherein for all input SPLs of said at least one portion of said incoming acoustical sound above said input threshold SPL, the corresponding output SPL of said at least one portion of said incoming acoustical sound is at most as large as the largest output SPL of said at least one portion of said outgoing acoustical sound for any input SPL of said at least one portion of said incoming acoustical sound equal to or below said input threshold SPL.
6. Hearing device according to claim 3 , wherein said input threshold SPL is chosen such that an SPL of a superposition of said outgoing acoustical sound and direct sound near the user's ear drum is below the user's uncomfortable level, wherein said direct sound is incoming acoustical sound reaching the user's ear drum.
7. Hearing device according to claim 3 , wherein said input threshold SPL is an input SPL for which the corresponding output SPL in dB minus the corresponding SPL of direct sound near the user's ear drum in dB is smaller than or equal to +6 dB, wherein said direct sound is incoming acoustical sound reaching the user's ear drum.
8. Hearing device according to claim 3 , wherein said input threshold SPL is chosen equal to an input SPL which is, within 6 dB, equal to its corresponding output SPL.
9. Hearing device according to claim 3 , wherein said input transducer tends to produce distorted input audio signals for input SPLs of said at least one portion of said incoming acoustical sound above a maximum input SPL, and wherein said input threshold SPL is smaller than or equal to said maximum input SPL.
10. Hearing device according to claim 3 , wherein said output transducer tends to produce distorted outgoing acoustical sound for output SPLs of said at least one portion of said outgoing acoustical sound above a maximum output SPL, and wherein said input threshold SPL is chosen such that, as output SPL of said at least one portion of said outgoing acoustical sound, at most said maximum output SPL is reached.
11. Hearing device according to claim 1 , which is an open canal device.
12. Hearing device according to claim 1 , which is a hearing aid.
13. Hearing device according to claim 1 , wherein said at least one portion of said incoming acoustical sound is said incoming acoustical sound, which is transduced by said input transducer.
14. Hearing device according to claim 1 , wherein said at least one portion of said outgoing acoustical sound is said outgoing acoustical sound as transduced by said output transducer.
15. Hearing device according to claim 1 , wherein said at least one portion of said incoming acoustical sound is obtained by filtering in at least a first frequency range.
16. Hearing device according to claim 1 , wherein said at least one portion of said outgoing acoustical sound is obtained by filtering in at least a second frequency range.
17. Hearing device according to claim 15 , wherein said at least one portion of said outgoing acoustical sound is obtained by filtering in at least a second frequency range, and wherein said first and second frequency ranges are identical.
18. Method of operating a hearing device, said method comprising the steps of:
receiving incoming acoustical sound;
transducing said incoming acoustical sound into audio signals;
processing said audio signals or audio signals derived therefrom, and outputting processed audio signals;
transducing said processed audio signals or audio signals derived therefrom into outgoing acoustical sound to be presented to a user of the hearing device; and
changing a level of said audio signals obtained from said incoming acoustical sound in such a way by means of open-loop control that an increase in input SPL of at least a portion of said incoming acoustical sound results in a decrease in output SPL of at least a portion of said outgoing acoustical sound, wherein SPL stands for sound pressure level.
19. Method of fitting a hearing device comprising an input transducer for transducing incoming acoustical sound into audio signals, said method comprising the step of adjusting at least one parameter of a signal processor of said hearing device, wherein said signal processor embodies an open-loop control designed such that there exists an input SPL range of at least a portion of said incoming acoustical sound, in which an increase in input SPL of said at least one portion of said incoming acoustical sound results in a decrease in output SPL of at least a portion of said outgoing acoustical sound, wherein SPL stands for sound pressure level.
20. Method according to claim 18 , wherein said at least one parameter is one selected from the group consisting of:
an input threshold SPL limiting said input SPL range;
an input SPL above which the output of said at least one portion of said outgoing acoustical sound is muted; and
a parameter of a parameter set describing to which extent and/or in which form said decrease in output SPL of said at least one portion of said outgoing acoustical sound depends on said increase in input SPL of said at least one portion of said incoming acoustical sound.
21. Hearing device according to claim 5 , wherein said decrease in output SPL is chosen such that an SPL of a superposition of said outgoing acoustical sound and direct sound near the user's ear drum is within ±3 dB.
22. Hearing device according to claim 6 , wherein the corresponding output SPL of said at least one portion of said incoming acoustical sound is smaller than the largest output SPL of said at least one portion of said outgoing acoustical sound for any input SPL of said at least one portion of said incoming acoustical sound equal to or below said input threshold SPL.
23. Hearing device to be worn by a user of the hearing device, comprising
an input transducer for transducing incoming signals into audio signals;
a signal processor for processing said audio signals or audio signals derived therefrom, and for outputting processed audio signals; and
an output transducer for transducing said processed audio signals or audio signals derived therefrom into outgoing acoustical sound;
wherein said signal processor embodies an open-loop control designed such that there exists an input level range of at least a portion of said incoming signal, in which an increase in input level of said at least one portion of said incoming signal results in a decrease in output level of at least a portion of said outgoing acoustical sound.
24. Method of operating a hearing device, said method comprising the steps of:
receiving incoming signals;
transducing said incoming signals into audio signals;
processing said audio signals or audio signals derived therefrom, and outputting processed audio signals;
transducing said processed audio signals or audio signals derived therefrom into outgoing acoustical sound to be presented to a user of the hearing device; and
changing a level of said audio signals obtained from said incoming signals in such a way by means of open-loop control that an increase in input level of at least a portion of said incoming signals results in a decrease in output level of at least a portion of said outgoing acoustical sound.
25. Method of fitting a hearing device comprising an input transducer for transducing incoming signals into audio signals, said method comprising the step of adjusting at least one parameter of a signal processor of said hearing device, wherein said signal processor embodies an open-loop control designed such that there exists an input level range of at least a portion of said incoming signals, in which an increase in input level of said at least one portion of said incoming signals results in a decrease in output level of at least a portion of said outgoing acoustical sound.
26. Hearing device to be worn by a user of the hearing device, comprising
an input transducer for transducing incoming acoustical sound into audio signals;
a signal processor for processing said audio signals or audio signals derived therefrom, and for outputting processed audio signals; and
an output transducer for transducing said processed audio signals or audio signals derived therefrom into outgoing acoustical sound;
wherein said signal processor is designed such that there exists an input SPL range of at least a portion of said incoming acoustical sound, in which an increase in input SPL of said at least one portion of said incoming acoustical sound results in a decrease in output SPL of at least a portion of said outgoing acoustical sound;
wherein SPL stands for sound pressure level;
wherein within said input SPL range there exists an input SPL above which the output of said least one portion of said outgoing acoustical sound is muted.
27. Method of operating a hearing device, said method comprising the steps of:
receiving incoming acoustical sound;
transducing said incoming acoustical sound into audio signals;
processing said audio signals or audio signals derived therefrom, and outputting processed audio signals;
transducing said processed audio signals or audio signals derived therefrom into outgoing acoustical sound to be presented to a user of the hearing device; and
changing a level of said audio signals obtained from said incoming acoustical sound in such a way that an increase in input SPL of at least a portion of said incoming acoustical sound results in a decrease in output SPL of at least a portion of said outgoing acoustical sound, wherein SPL stands for sound pressure level, and wherein there exists an input SPL above which the output of said least one portion of said outgoing acoustical sound is muted.