Tinnitus rehabiliation device and method
A tinnitus method and device for providing relief to a person suffering from the disturbing effects of tinnitus is described. The method can be implemented entirely in software to spectrally modify an audio signal in accordance with a predetermined masking algorithm which modifies the intensity of the audio signal at selected frequencies. A predetermined masking algorithm is described which provides intermittent masking of the tinnitus wherein, at a comfortable listening level, during peaks of the audio signal the tinnitus is completely obscured, whereas during troughs the perception of the tinnitus occasionally emerges. In practice it has been found that such intermittent masking provides an immediate sense of relief, control and relaxation for the person, while enabling sufficient perception of the tinnitus for habituation and long term treatment to occur. Advantageously the predetermined masking algorithm is specifically tailored to the audiometric configuration of the person. For example, the masking algorithm may be partly tailored to the hearing loss characteristic of the person. A tinnitus rehabilitation device used in conjunction with a personal sound reproducing system is also described.
1. A device for providing relief to a person suffering from the disturbing effects of tinnitus, the device comprising:
a memory for storing an audio signal including peaks and troughs, wherein at least one of the peaks and the troughs of at least a portion of the audio signal at selected frequencies has been modified;
an output for outputting the audio signal for treating the tinnitus; and
a volume adjusting feature for allowing a patient to adjust the volume of the audio signal;
wherein the audio signal accounts for the basic audiometric configuration of the person whereby, when the audio signal is heard by the person during the peaks, the tinnitus is at least substantially obscured, and during troughs, the tinnitus less obscured; and
wherein the audio signal is partly tailored to a hearing loss characteristic of the person.
2. A device as defined in claim 1 , further comprising a signal filter programmed with a predetermined masking algorithm adapted to particular needs of the person suffering from tinnitus.
3. A device as defined in claim 2 , wherein said predetermined masking algorithm is designed to modify the intensity of the incoming signal across substantially a full spectral range of the incoming signal.
4. A device as defined in claim 3 , wherein the audio signal is a highly dynamic signal whose spectral content and intensity constantly varies over time.
5. A device as defined in claim 4 , wherein the audio signal is a music signal.
6. A device as defined in claim 1 , further comprising a compliance monitoring system for allowing a patient to monitor how much time the patient has used the device during a fixed time period.
7. A device as defined in claim 1 , further comprising a safety locking function for preventing a patient from using the device if the memory does not contain the patient's treatment signal.
8. A device as defined in claim 1 , further comprising a data downloading function for downloading logged information, wherein the logged information contains information relating to the patient's use of the device.
9. A device as defined in claim 8 , wherein the data downloading function is performed by at least one of a wired interface, an infrared interface, or a wireless interface.
10. A device as defined in claim 1 , wherein the audio signal includes spectral qualities so as to provide a relatively equal sensation level across a major portion of an audio spectrum in both ears.
11. A device as defined in claim 10 , wherein said audio signal is formed based on a predetermined masking algorithm which incorporates, at least in part, a set of calibration figures for converting dB HL (Hearing Level) to dB SPL (Sound Pressure Level).
12. A device as defined in claim 11 , wherein the predetermined masking algorithm is of the form:
REQ=M ( SPL+ELC ( F )−Baseline)
where
REQ=Required equalisation response of the Tinnitus Retraining Protocol
Baseline=0.5(A−B)+B
A=mean dB SPL at the two adjacent greatest hearing loss frequencies in the greatest hearing loss ear
B=mean dB SPL at the two adjacent least hearing loss frequencies in the least hearing loss ear
SPL=hearing thresholds (in dB HL) converted to dB SPL
ELC=transfer values for 40 Phon Equal Loudness Contours
M=gain multiplier 0.3 to 0.95 Preferably M=0.4
F=a plurality of frequencies within the accepted range of normal human hearing.