US4548082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aids, signal supplying apparatus, systems for compensating hearing deficiencies, and methods
Assignee: HIMPP K/S
•
Filing: 1984-08-28
•
Granted: 1985-10-22
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Expires: 2004-08-28
Abstract
Abstract A hearing aid including a microphone for generating an electrical output from sounds external to a user of the hearing aid, an electrically driven receiver for emitting sound into the ear of the user of the hearing aid, and circuitry for driving the receiver. The circuitry drives the receiver in a self-generating mode activated by a first set of signals supplied externally of the hearing aid to cause the receiver to emit sound having at least one parameter controlled by the first set of externally supplied signals and then drives the receiver in a filtering mode, activated by a second set of signals supplied externally of the hearing aid, with the output of the external microphone filtered according to filter parameters established by the second set of the externally supplied signals. Other forms of the hearing aid, apparatus for supplying the sets of signals to the hearing aid in a total system, and methods of operation are also described.
Inventors
- 👤 A. Maynard Engebretson
- 👤 Robert E. Morley, Jr.
- 👤 Gerald R. Popelka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:06
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/55; H04R25/556; H04R25/70; H04R25/75; H04R1/00; H04R1/20; H04R1/22; H04R1/26; H04R2225/00; H04R2225/59; H04R25/30; H04R25/35; H04R25/356; H04R25/50; H04R25/505
Claims Analysis
Total Claims: 65
Claim 1
Independent Claim
127 words
A hearing aid comprising: a microphone for generating an electrical output from sounds external to a user of the hearing aid; an electrically driven receiver for emitting sound into the ear of the user of the hearing aid; and means for driving the receiver in a self-generating mode activated by a first set of signals supplied externally of the hearing aid to cause the receiver to emit sound having at least one parameter controlled by the first set of externally supplied signals and for then driving the receiver in a filtering mode, activated by a second set of signals supplied externally of the hearing aid, with the output of the external microphone filtered according to filter parameters established by the second set of the externally supplied signals.
Claim 2
Dependent Claim
127 words
A hearing aid comprising: a microphone for generating an electrical output from sounds external to a user of the hearing aid; an electrically driven receiver for emitting sound into the ear of the user of the hearing aid; and means for driving the receiver in a self-generating mode activated by a first set of signals supplied externally of the hearing aid to cause the receiver to emit sound having at least one parameter controlled by the first set of externally supplied signals and for then driving the receiver in a filtering mode, activated by a second set of signals supplied externally of the hearing aid, with the output of the external microphone filtered according to filter parameters established by the second set of the externally supplied signals.
Claim 3
Dependent Claim
68 words
The hearing aid as set forth in claim 1 further comprising a second microphone adapted for sensing sound in the ear of the user of the hearing aid, and wherein the driving means comprises means coupled to the second microphone for also supplying a signal for external utilization, the signal representing the at least one parameter of the sound controlled by the first set of externally supplied signals.
Claim 4
Dependent Claim
42 words
The hearing aid as set forth in claim 2 further comprising an external connector for making available the signal for external utilization from said driving means and for admitting the first and second sets of signals supplied externally of the hearing aid.
Claim 5
Dependent Claim
53 words
The hearing aid as set forth in claim 1 further comprising a second microphone adapted for sensing sound in the ear of the user of the hearing aid, and wherein said driving means comprises means responsive to the second microphone for also self-adjusting the operation of the driving means in the filtering mode.
Claim 6
Dependent Claim
83 words
The hearing aid as set forth in claim 1 further comprising a second microphone adapted for sensing sound in the ear of the user of the hearing aid, and wherein said driving means comprises means responsive to the second microphone for comparing the output of the second microphone with the degree of drive provided by the driving means to the receiver in the filtering mode and for then self-adjusting at least one of the filter parameters depending on the result of the comparison.
Claim 7
Dependent Claim
59 words
The hearing aid as set forth in claim 1 further comprising a second microphone adapted for sensing sound in the ear of the user of the hearing aid, and wherein the driving means comprises means coupled to the second microphone for also supplying a signal for external utilization, the signal representing a mean-square sound pressure parameter of the sound.
Claim 8
Dependent Claim
56 words
The hearing aid as set forth in claim 1 wherein the driving means comprises programmable digital filter means for programmably producing perturbations having a controlled electrical parameter in response to the first set of externally supplied signals, the sound emitted by the receiver having a controlled parameter corresponding to the controlled electrical parameter of the perturbations.
Claim 9
Dependent Claim
47 words
The hearing aid as set forth in claim 1 wherein the driving means comprises programmable digital filter means for utilizing the filter parameters established by the second set of externally supplied signals to establish the maximum power output of the hearing aid as a function of frequency.
Claim 10
Dependent Claim
81 words
The hearing aid as set forth in claim 1 wherein the driving means comprises means for utilizing the filter parameters established by the second set of externally supplied signals to establish the maximum power output of the hearing aid as a function of frequency and for also supplying a signal for external utilization, the last-said signal representing the number of times as a function of frequency that the established maximum power output of the hearing aid occurs in a predetermined period.
Claim 11
Dependent Claim
41 words
The hearing aid as set forth in claim 1 wherein the driving means in the filtering mode comprises programmable digital filter means for performing operations in a plurality of frequency ranges, the operations including filtering followed by limiting followed by filtering.
Claim 12
Dependent Claim
27 words
The hearing aid as set forth in claim 1 wherein said receiver comprises a plurality of transducers driven by said driving means in distinct frequency ranges respectively.
Claim 13
Dependent Claim
118 words
A hearing aid having a body adapted to be placed in communication with an ear canal, the hearing aid body having an external mircrophone sensitive to external sound, and a receiver for supplying sound to the ear canal, the hearing aid comprising: a probe microphone in the hearing aid body for sensing the sound present in the ear canal; and means connected to the external microphone and said probe microphone for driving the receiver in response to both the external microphone and said probe microphone, and for generating a digital signal for external use in adjusting the performance of the hearing aid, the digital signal representing at least one parameter of the sound sensed by the probe microphone.
Claim 14
Dependent Claim
118 words
A hearing aid having a body adapted to be placed in communication with an ear canal, the hearing aid body having an external mircrophone sensitive to external sound, and a receiver for supplying sound to the ear canal, the hearing aid comprising: a probe microphone in the hearing aid body for sensing the sound present in the ear canal; and means connected to the external microphone and said probe microphone for driving the receiver in response to both the external microphone and said probe microphone, and for generating a digital signal for external use in adjusting the performance of the hearing aid, the digital signal representing at least one parameter of the sound sensed by the probe microphone.
Claim 15
Dependent Claim
59 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises digital filtering means having at least one external connector for making the digital signal externally available and for admitting additional digital signals so that the digital filtering means can be programmed when the hearing aid is placed in communication with the ear canal.
Claim 16
Dependent Claim
35 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises means for generating the digital signal to represent the mean-square pressure of the sound sensed by the probe microphone.
Claim 17
Dependent Claim
43 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises a multiplexer having respective inputs for coupling to said probe microphone and to the external microphone, and said multiplexer being coupled to said digital signal processing means.
Claim 18
Dependent Claim
36 words
The hearing aid as set forth in claim 15 wherein said driving and generating means further comprises means for coupling the output of the external microphone with preemphasis to one of the inputs of said multiplexer.
Claim 19
Dependent Claim
36 words
The hearing aid as set forth in claim 15 wherein said driving and generating means further comprises means for coupling the output of the external microphone with compression to one of the inputs of said multiplexer.
Claim 20
Dependent Claim
36 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises means for filtering, then limiting, and then filtering the output of the external microphone in a plurality of frequency ranges.
Claim 21
Dependent Claim
43 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises means for filtering the output of the external microphone according to filter parameters establishing the maximum power output of the hearing aid as a function of frequency.
Claim 22
Dependent Claim
91 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises means for filtering the output of the external microphone according to filter parameters establishing the maximum power output of the hearing aid as a function of frequency and for also generating a second digital signal for external use in adjusting the performance of the hearing aid, the second digital signal representing the number of times as a function of frequency that the established maximum power output of the hearing aid occurs in a predetermined period.
Claim 23
Dependent Claim
57 words
The hearing aid as set forth in claim 12 wherein the driving and generating means comprises means for also filtering, then limiting, and then filtering the output of the external microphone according to a set of internal parameters and for self-adjusting at least one of the internal parameters in response to the output of the probe microphone.
Claim 24
Dependent Claim
111 words
A hearing aid having a body adapted to be placed in communication with an ear canal, the hearing aid body having an external microphone sensitive to external sound, and a receiver for supplying sound to the ear canal, the hearing aid comprising: a probe microphone in the hearing aid body for sensing the sound present in the ear canal; and means connected to the external microphone for filtering, then limiting, and then filtering the output of the external microphone according to a set of internal parameters and for self-adjusting at least one of the internal parameters as a function of the output of the probe microphone, thereby to drive the receiver.
Claim 25
Dependent Claim
111 words
A hearing aid having a body adapted to be placed in communication with an ear canal, the hearing aid body having an external microphone sensitive to external sound, and a receiver for supplying sound to the ear canal, the hearing aid comprising: a probe microphone in the hearing aid body for sensing the sound present in the ear canal; and means connected to the external microphone for filtering, then limiting, and then filtering the output of the external microphone according to a set of internal parameters and for self-adjusting at least one of the internal parameters as a function of the output of the probe microphone, thereby to drive the receiver.
Claim 26
Dependent Claim
46 words
The hearing aid as set forth in claim 22 wherein said filtering, limiting and self-adjusting means comprises means for also comparing the output of the probe microphone with the degree of drive to the receiver and performing the self-adjusting depending on the result of the comparison.
Claim 27
Dependent Claim
136 words
A hearing aid for connection to an external source of programming signals and having a body adapted to be placed in communication with an ear canal, the hearing aid body having an external microphone sensitive to external sound, and a receiver for supplying sound to the ear canal, the hearing aid comprising: a probe microphone in the hearing aid body for sensing the sound present in the ear canal; and digital computing means in the hearing aid and coupled to the external microphone, to said probe microphone and to the receiver, and adapted for connection to the external source of programming signals, said digital computing means comprising means for loading and executing entire programs represented by the signals and thereby utilizing said probe microphone, the external microphone and the receiver for hearing testing and digital filtering.
Claim 28
Dependent Claim
136 words
A hearing aid for connection to an external source of programming signals and having a body adapted to be placed in communication with an ear canal, the hearing aid body having an external microphone sensitive to external sound, and a receiver for supplying sound to the ear canal, the hearing aid comprising: a probe microphone in the hearing aid body for sensing the sound present in the ear canal; and digital computing means in the hearing aid and coupled to the external microphone, to said probe microphone and to the receiver, and adapted for connection to the external source of programming signals, said digital computing means comprising means for loading and executing entire programs represented by the signals and thereby utilizing said probe microphone, the external microphone and the receiver for hearing testing and digital filtering.
Claim 29
Dependent Claim
26 words
The hearing aid as set forth in claim 24 wherein said digital computing means further comprises serial interface means for two-way communication with the external source.
Claim 30
Dependent Claim
28 words
The hearing aid as set forth in claim 24 further comprising multiplexing means for coupling the digital computing means to the external microphone and to said probe microphone.
Claim 31
Dependent Claim
46 words
The hearing aid as set forth in claim 26 further comprising means, connecting the multiplexing means to the external microphone, for applying preemphasis to the output of the external microphone, said probe microphone being connected to said multiplexing means so as to bypass said preemphasis means.
Claim 32
Dependent Claim
44 words
The hearing aid as set forth in claim 26 further comprising means, connecting the multiplexing means to the external microphone, for compressing the output of the external microphone, said probe microphone being connected to said multiplexing means so as to bypass said compressing means.
Claim 33
Independent Claim
174 words
A system for compensating hearing deficiencies of a patient, comprising: a hearing aid having an external microphone, programmable means for filtering the output of the external microphone, and a receiver driven by the programmable filtering means for emitting sounds into the ear of the patient; means for sensing responses of the patient to sounds from the receiver; and means communicating with the hearing aid and the sensing means, for selectively generating a first set of signals to cause the programmable filtering means in the hearing aid to operate so that the receiver emits sounds having a parameter controlled by the first set of signals, and for then generating in response to said sensing means a second set of signals determined from the controlled parameter and the responses of the patient to the sounds with the controlled parameter to establish filter parameters in the programmable filtering means to cause it to filter the output of the external microphone and to drive the receiver with the filtered output thereby ameliorating the hearing deficiencies of the patient.
Claim 34
Independent Claim
174 words
A system for compensating hearing deficiencies of a patient, comprising: a hearing aid having an external microphone, programmable means for filtering the output of the external microphone, and a receiver driven by the programmable filtering means for emitting sounds into the ear of the patient; means for sensing responses of the patient to sounds from the receiver; and means communicating with the hearing aid and the sensing means, for selectively generating a first set of signals to cause the programmable filtering means in the hearing aid to operate so that the receiver emits sounds having a parameter controlled by the first set of signals, and for then generating in response to said sensing means a second set of signals determined from the controlled parameter and the responses of the patient to the sounds with the controlled parameter to establish filter parameters in the programmable filtering means to cause it to filter the output of the external microphone and to drive the receiver with the filtered output thereby ameliorating the hearing deficiencies of the patient.
Claim 35
Dependent Claim
47 words
The system as set forth in claim 29 wherein said programmable filtering means comprises digital computing means for programmably producing perturbations having an electrical parameter controlled by the first set of signals, the controlled parameter of the sounds corresponding to the controlled electrical parameter of the perturbations.
Claim 36
Dependent Claim
58 words
The system as set forth in claim 29 wherein said hearing aid further comprises a probe microphone for sensing the actual sound in the ear of the patient, and the programmable filtering means comprises means responsive to the probe microphone for also producing a signal for communication to the generating means representing the controlled parameter of the sound.
Claim 37
Dependent Claim
52 words
The system as set forth in claim 29 wherein said programmable filtering means comprises means for also producing a signal for communication to the generating means representing the number of times as a function of frequency that a preestablished level of power output of the hearing aid occurs in a predetermined period.
Claim 38
Dependent Claim
29 words
The system as set forth in claim 29 further comprising means controlled by the generating means, for selectively producing hearing test sounds in the vicinity of the hearing aid.
Claim 39
Dependent Claim
48 words
The system as set forth in claim 29 wherein the programmable filtering means comprises first digital computing means and first serial interface means in the hearing aid and the generating means comprises second digital computing means and second serial interface means communicating with said first serial interface means.
Claim 40
Dependent Claim
32 words
The system as set forth in claim 29 wherein said generating means comprises means for also downloading an entire digital filter program to the hearing aid through the second set of signals.
Claim 41
Dependent Claim
33 words
The system as set forth in claim 29 wherein said generating means comprises means for also downloading an entire test sound generating program to the hearing aid through the first set of signals.
Claim 42
Dependent Claim
54 words
The system as set forth in claim 29 wherein said generating means comprises means for also graphically displaying hearing threshold, uncomfortable loudness level, and performance characteristics of the hearing aid, and for generating a third set of signals determined by interaction with an operator for establishing adjusted filter parameters in the programmable filtering means.
Claim 43
Independent Claim
197 words
A system for compensating hearing deficiencies of a patient, comprising: a hearing aid having an external microphone, a programmable digital computer in the hearing aid and fed by the external microphone, a receiver fed by the programmable digital computer for emitting sounds into the ear of the patient, and a probe microphone for sensing the actual sound in the ear of the patient; a data link; and means for selectively supplying at least a first set and a subsequent second set of digital signals to said data link, said data link communicating the digital signals to said programmable digital computer of said hearing aid; said programmable digital computer comprising means for selectively driving said receiver so that at least one sound for hearing testing is emitted into the ear in response to the first set of digital signals, for supplying to said data link a third set of digital signals representing a parameter of the output of said probe microphone, and for subsequently filtering the output of said external microphone in response to the subsequently supplied second set of digital signals to drive said receiver in a manner adapted for ameliorating the hearing deficiencies of the patient.
Claim 44
Independent Claim
197 words
A system for compensating hearing deficiencies of a patient, comprising: a hearing aid having an external microphone, a programmable digital computer in the hearing aid and fed by the external microphone, a receiver fed by the programmable digital computer for emitting sounds into the ear of the patient, and a probe microphone for sensing the actual sound in the ear of the patient; a data link; and means for selectively supplying at least a first set and a subsequent second set of digital signals to said data link, said data link communicating the digital signals to said programmable digital computer of said hearing aid; said programmable digital computer comprising means for selectively driving said receiver so that at least one sound for hearing testing is emitted into the ear in response to the first set of digital signals, for supplying to said data link a third set of digital signals representing a parameter of the output of said probe microphone, and for subsequently filtering the output of said external microphone in response to the subsequently supplied second set of digital signals to drive said receiver in a manner adapted for ameliorating the hearing deficiencies of the patient.
Claim 45
Dependent Claim
35 words
The system as set forth in claim 38 further comprising means for producing hearing test sounds for the hearing aid, and wherein said supplying means comprises means for also controlling the hearing test sound means.
Claim 46
Dependent Claim
61 words
The system as set forth in claim 38 wherein said hearing aid also includes a memory having hearing aid calibration data stored therein and said supplying means comprises means for also retrieving the calibration data from said hearing aid memory and utilizing the calibration data and the parameter of the probe microphone output in supplying the second set of digital signals.
Claim 47
Dependent Claim
33 words
The system as set forth in claim 38 wherein said supplying means comprises means for downloading to the hearing aid entire computer programs represented by the first and second sets of digital signals.
Claim 48
Dependent Claim
42 words
The system as set forth in claim 38 wherein said supplying means comprises means for also causing the digital computer in the hearing aid to utilize the output of the probe microphone in self-adjusting at least one parameter of its filtering operation.
Claim 49
Dependent Claim
208 words
For use in a system for compensating hearing deficiencies of a patient, including a hearing aid having an external microphone, a digital computer in the hearing aid fed by the external microphone, a receiver fed by the digital computer for emitting sounds into the ear of the patient, and a probe microphone for sensing the actual sound in the ear of the patient, signal supplying apparatus comprising: interface means for performing two-way digital serial communication with the digital computer in the hearing aid; and means for initiating transmission of a first set of signals from said interface means to the hearing aid to cause the digital computer in the hearing aid to operate so that the receiver emits sounds having an adjustable parameter, for obtaining, through the interface means, data representing values of the adjustable parameter of the sounds as sensed by the probe microphone, and for then initiating transmission from said interface means of a second set of signals determined at least in part from the values of the parameter of the sensed sounds to cause the digital computer in the hearing aid to filter the output of the external microphone and drive the receiver with the filtered output, thereby ameliorating the hearing deficiencies of the patient.
Claim 50
Dependent Claim
208 words
For use in a system for compensating hearing deficiencies of a patient, including a hearing aid having an external microphone, a digital computer in the hearing aid fed by the external microphone, a receiver fed by the digital computer for emitting sounds into the ear of the patient, and a probe microphone for sensing the actual sound in the ear of the patient, signal supplying apparatus comprising: interface means for performing two-way digital serial communication with the digital computer in the hearing aid; and means for initiating transmission of a first set of signals from said interface means to the hearing aid to cause the digital computer in the hearing aid to operate so that the receiver emits sounds having an adjustable parameter, for obtaining, through the interface means, data representing values of the adjustable parameter of the sounds as sensed by the probe microphone, and for then initiating transmission from said interface means of a second set of signals determined at least in part from the values of the parameter of the sensed sounds to cause the digital computer in the hearing aid to filter the output of the external microphone and drive the receiver with the filtered output, thereby ameliorating the hearing deficiencies of the patient.
Claim 51
Dependent Claim
29 words
Signal supplying apparatus as set forth in claim 43 further comprising an acoustic source for providing hearing test sounds to the external microphone and controlled by the initiating means.
Claim 52
Dependent Claim
57 words
Signal supplying apparatus as set forth in claim 43 for use with a hearing aid having a memory with hearing aid calibration data stored therein, wherein said initiating means comprises means for also obtaining the hearing calibration data through the interface means, and also utilizing the hearing aid calibration data in determining the second set of signals.
Claim 53
Dependent Claim
52 words
Signal supplying apparatus as set forth in claim 43 wherein said initiating means comprises means for downloading a test sound generating program represented by the first set of signals to the hearing aid through said interface means and for downloading a filter-limit-filter digital filtering program represented by the second set of signals.
Claim 54
Dependent Claim
39 words
Signal supplying apparatus as set forth in claim 43 further comprising a terminal connected to the initiating means for displaying and adjusting the filtering performance of the hearing aid resulting from the transmission of the second set of signals.
Claim 55
Dependent Claim
63 words
Signal supplying apparatus as set forth in claim 43 further comprising means, connected to the initiating means, for sensing responses of the patient to the sounds emitted from the receiver, and wherein said initiating means comprises means for also obtaining data representing the responses of the patient from the sensing means and utilizing the response data in determining the second set of signals.
Claim 56
Independent Claim
159 words
A method for compensating hearing deficiencies of a patient with a hearing aid having an external microphone, electronic means for processing the output of the external microphone, and a receiver driven by the electronic processing means for emitting sound into the ear of the patient, comprising the steps of: selectively supplying a first set of signals to the hearing aid to cause the electronic processing means to operate so that the receiver emits sound having a parameter controlled by the first set of signals; sensing and electrically storing representations of responses of the patient to the sound; and supplying a second set of signals determined from the at least one controlled parameter of the sound and the representations of the patient responses to the sound with the controlled parameter to cause the electronic processing means to filter the output of the external microphone and drive the receiver with the filtered output, thereby ameliorating the hearing deficiencies of the patient.
Claim 57
Independent Claim
159 words
A method for compensating hearing deficiencies of a patient with a hearing aid having an external microphone, electronic means for processing the output of the external microphone, and a receiver driven by the electronic processing means for emitting sound into the ear of the patient, comprising the steps of: selectively supplying a first set of signals to the hearing aid to cause the electronic processing means to operate so that the receiver emits sound having a parameter controlled by the first set of signals; sensing and electrically storing representations of responses of the patient to the sound; and supplying a second set of signals determined from the at least one controlled parameter of the sound and the representations of the patient responses to the sound with the controlled parameter to cause the electronic processing means to filter the output of the external microphone and drive the receiver with the filtered output, thereby ameliorating the hearing deficiencies of the patient.
Claim 58
Dependent Claim
63 words
The method as set forth in claim 49 wherein the electronic processing means includes programmable filtering means and the first signal supplying step comprises programming the programmable filtering means to produce perturbations having an electrical parameter controlled by the first set of signals, thereby causing the receiver to emit sound having a controlled parameter corresponding to the controlled electrical parameter of the perturbations.
Claim 59
Dependent Claim
54 words
The method as set forth in claim 49 wherein the hearing aid further comprises a probe microphone for sensing the actual sound in the ear of the patient, and the method further comprises the step of producing a signal for use in the second signal supplying step representing the controlled parameter of the sound.
Claim 60
Dependent Claim
61 words
The method as set forth in claim 51 wherein the electronic processing means includes programmable filtering means having filter parameters established by the second signal supplying step, and the method further comprises the step of causing the programmable filtering means in the hearing aid to utilize the output of the probe microphone in self-adjusting at least one of the filter parameters.
Claim 61
Dependent Claim
60 words
The method as set forth in claim 49 further comprising the step of causing the electronic processing means in the healing aid to produce a signal for use in the second signal supplying step representing the number of times as a function of frequency that a preestablished level of power output of the hearing aid occurs in a predetermined period.
Claim 62
Dependent Claim
36 words
The method as set forth in claim 49 wherein the second signal supplying step comprises downloading an entire digital filter program for filtering, limiting and filtering to the hearing aid through the second set of signals.
Claim 63
Dependent Claim
32 words
The method as set forth in claim 49 wherein the first signal supplying step comprises downloading an entire test sound generating program to the hearing aid through the first set of signals.
Claim 64
Dependent Claim
55 words
The method as set forth in claim 49 further comprising the steps of graphically displaying hearing threshold, most comfortable loudness level, uncomfortable loudness level, and performance characteristics of the hearing aid, and generating a third set of signals based on information supplied by an operator for adjusting the filtering performance of the electronic processing means.
Claim 65
Dependent Claim
52 words
The method as set forth in claim 49 wherein the hearing aid also includes a memory having hearing aid calibration data stored therein and the method further comprises the steps of retrieving the calibration data from the hearing aid memory and utilizing the calibration data in supplying the second set of signals.
References Cited (Backward Citations)
US3757769A
Cited
US3927279A
Cited
US3818149A
Cited
US4188667A
Cited
US4099035A
Cited
US4187413A
Cited
CH624524A5
Cited
DE2808516A1
Cited
US4251686A
Cited
US4390748A
Cited
US4403118A
Cited
US4489610A
Cited
USPTO Annuity & Maintenance Windows
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| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |