EP1793649A1 - Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device - Google Patents
Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device Download PDFInfo
- Publication number
- EP1793649A1 EP1793649A1 EP05257370A EP05257370A EP1793649A1 EP 1793649 A1 EP1793649 A1 EP 1793649A1 EP 05257370 A EP05257370 A EP 05257370A EP 05257370 A EP05257370 A EP 05257370A EP 1793649 A1 EP1793649 A1 EP 1793649A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microphone
- hearing aid
- audio
- filter
- speaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 230000036039 immunity Effects 0.000 title claims abstract description 7
- 230000005236 sound signal Effects 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 210000000613 ear canal Anatomy 0.000 claims abstract description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- 239000011324 bead Substances 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000010370 hearing loss Effects 0.000 description 8
- 231100000888 hearing loss Toxicity 0.000 description 8
- 208000016354 hearing loss disease Diseases 0.000 description 8
- 206010011878 Deafness Diseases 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 210000003127 knee Anatomy 0.000 description 4
- 239000007943 implant Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
- H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
- H04R2225/49—Reducing the effects of electromagnetic noise on the functioning of hearing aids, by, e.g. shielding, signal processing adaptation, selective (de)activation of electronic parts in hearing aid
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
- H04R25/607—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of earhooks
Definitions
- This invention relates to hearing aids, and more particularly, this invention relates to hearing aids that include filters for improving RF immunity to RF electromagnetic interference.
- some mobile wireless communications devices or other wireless communications devices are used near some hearing aid devices, for example, a cochlear implant or a behind-the-ear (BTE) hearing aid having a tone hook and earmold
- BTE behind-the-ear
- users often detect a buzzing, humming or whining noise, or other unwanted audible noise such as a Global System for Mobile communications (GSM) buzz, which can be annoying to users.
- GSM Global System for Mobile communications
- Some hearing aids are more immune than others and have appropriate filters for suppressing this interference noise, while some phones vary in the amount of interference they generate.
- the wireless telephone industry has developed ratings for some mobile phones to assist hearing aid users in finding a phone that is more compatible with their hearing aid. Not all phones have been rated, however, but typically, a phone should have a rating listed on its box or on a label on the box. These ratings are not guarantees and some results vary depending on the type of hearing aid and user hearing loss.
- Some ratings use an M-ratings scale with phones rated M3 or M4 meeting FCC requirements that are likely to generate less interference to hearing aids than phones that are not labeled. M4 is a higher rating.
- a T-ratings scale occurs with phones rated T3 or T4 meeting FCC requirements, and likely to be useable with a hearing aid telecoil ("T-switch" or "telephone switch") than unrated phones. T4 is the better quality.
- Some hearing aid devices do not include telecoils. Also, some hearing aids can be measured for immunity to this type of interference.
- RF filters and RF shielding techniques can be implemented in a microphone circuit or speaker of a hearing aid. These types of filters and shielding can also be supplied to a power supply circuit and other circuits in a hearing aid to reduce the RF coupling from the wireless communications device to those circuits in the hearing aid, causing an audible unwanted noise, such as GSM buzz.
- the hearing aid has improved immunity to RF electromagnetic interference produced from wireless communications devices, for example, cellular telephones.
- a microphone receives audio or acoustic signals from the environment.
- Audio circuitry is connected to the microphone and amplifies the audio signals.
- a speaker is connected to the audio circuitry and directs the audio or acoustic signals into an ear of a user using the hearing aid.
- Audio connection lines connect the microphone and audio circuitry and the speaker and audio circuitry.
- a filter is connected into each of the audio connection lines and operative for reducing the RF coupling from a wireless communications device.
- a filter is serially connected into each audio connection line and can be formed as a ferrite inductor or ferrite bead.
- the filter could be formed as an LC filter serially connected into each audio connection line.
- a second filter element could be connected into the audio connection line that is connected to the speaker, and serially connected to another filter.
- the second filter element could be formed as a ferrite inductor.
- an RF shield could surround one of at least a speaker or microphone to aid in reducing the RF coupling from a wireless communications device.
- the RF shield could be formed as a metallic housing.
- a hearing aid housing could support the microphone, speaker and audio circuitry.
- a tone hook could be connected to the hearing aid housing for receiving audio signals from the speaker.
- An earmold could be connected to the tone hook and adapted to be inserted within the ear of a user.
- a microphone bias line connects the microprocessor and microphone for carrying microphone bias control signals between the microprocessor and the microphone.
- a microphone bias filter is connected into each of the microphone bias lines for reducing the RF coupling from a wireless communications device.
- FIG. 1 is a perspective view of a behind-the-ear (BET) hearing aid that includes an earmold for ear insertion with the audio circuitry and other components, including a filter for reducing RF electromagnetic interference produced from a wireless communications device.
- BET behind-the-ear
- FIG. 2 is a block diagram showing basic functional components of a hearing aid that could be adapted to incorporate a filter to decrease unwanted audible noise, such as GSM buzz, and any electromagnetic interference produced from a wireless communications device.
- FIG. 3 is a schematic circuit diagram showing a combination microphone and filter circuit, which could be incorporated into the microphone shown in FIG. 2.
- FIG. 4 is a schematic circuit diagram showing a combination speaker and filter circuit, which could be incorporated into the speaker shown in FIG. 2.
- FIG. 5 is a graph showing a threshold of hearing and discomfort for a typical normal ear.
- FIG. 6 is a typical threshold of hearing and discomfort for an ear with some hearing loss.
- the embodiments as described address the RF interference produced from a wireless communications device, for example, a cellular phone to a hearing aid.
- This interference can cause unwanted audible noise, such as GSM buzz, which can be annoying to users.
- FCC Federal Communications Commission
- HAC hearing aid compatibility
- the embodiments as described target the hearing aid side of the problem instead of concentrating on cell phone compatibility.
- a typical hearing aid includes a microphone, amplifier, volume control, an earphone (receiver), power source, and some type of coupling to the ear such as an earmold.
- the microphone takes the incoming signal and filters it to provide a respective frequency response.
- Amplifiers take the resulting signal and make it louder.
- a receiver converts the signal back into an acoustical form of the signal that the ear can hear.
- a hearing aid is shown in FIG. 1 at 10 and designed and configured as a behind-the-ear (BTE) hearing aid.
- BTE behind-the-ear
- All different types of hearing aids can be used with the RF filtering as will be described, including hearing aids that are inserted directly into the ear canal of a user, for example, a cochlear implant, or supported by the ears as shown in the BTE hearing aid of FIG. 1.
- the hearing aid 10 typically includes a hearing aid housing 12, having audio circuitry within the housing and indicated by a dashed line at 13, and a battery compartment 14 for holding a battery for powering the audio circuitry.
- An on/off switch 16 allows on/off operation to be user controlled.
- a volume control 18 allows user control over the amount of amplification or sound amplitude heard through the ear.
- the microphone 20 and speaker 22 are shown at an end of the hearing aid.
- a tone hook 24 extends from the speaker 22 and includes an earmold 26 connected thereto that has a hearing insert that is adapted to be inserted within the ear canal of a user.
- FIG. 2 is a block diagram of a typical hearing aid 30, including the microphone 32 that receives acoustical or audio signals from the environment.
- the analog voltage signals produced at the microphone by the transducer as Vin_P and Vin_N signals are input into a low pass filter 34 and digitally converted by an analog-to-digital converter 36 after low pass filtering. After conversion, the digital signals are processed at a digital signal processor (DSP) 38 with standard digital signal processing techniques.
- DSP digital signal processor
- a microprocessor 40 is operative with the DSP 38 and the microprocessor transmits microphone bias control signals over microphone bias lines as a microphone bias (MIC_BIAS) and supplementary microphone voltage (MIC_VSUP) line. Signals are transferred back to the microphone in a closed loop system as illustrated at 41 in FIG. 2.
- MIC_BIAS microphone bias
- MIC_VSUP supplementary microphone voltage
- the digital signal is processed in a digital-to-analog filter 42 and filtered in a low pass filter 44.
- the voltage signals from the low pass filter 44 as Vout_P and Vout_N are transferred to the speaker 46, which could be connected to an earmold that is inserted within the ear or as part of a cochlear implant or BTE hearing aid.
- FIGS. 3 and 4 illustrate the type of electromagnetic interference (EMI) filters that can be used with the microphone 32 (FIG. 3) and the speaker 46 (FIG. 4).
- the microphone is formed as an overall microphone circuit 32 having an output into the low pass filter 34 as Vin_P and Vin_N, and four capacitors C1, C2, C3, C4 and two inductors L1, L2.
- a first and second capacitor C1, C2 are connected parallel into the Vin_P and Vin_N lines.
- Serially connected capacitors C3, C4 and inductors L1, L2 are connected in each line.
- a feedback circuit from the microprocessor as a microphone bias line includes an inductor L3, L4 and grounded capacitor C5, C6 in each line, followed by another grounded capacitor C7, C8 in each line as it enters the microphone as illustrated.
- the entire circuit as described could be enclosed with an RF shield 32a, or just the transducer area of the microphone shown by the dashed lines 32b.
- FIG. 4 shows a filter for the speaker illustrating the Vout_P and Vout_N audio connection lines.
- Each line includes serially connected ferrite inductor elements L1, L2, L3 and L4, resistor elements R1, R2, and non-ferrite inductor elements L5, L6.
- Four parallel capacitors C1, C2, C3 and C4 are connected as illustrated.
- the ferrite inductors L1, L2, L3 and L4 can be formed as a ferrite bead.
- the non-fernte inductor L5, L6 in each line can be formed as a 680 microhenry inductor in one non-limiting example.
- the resistors R1, R2 can be 28 ohm resistors in one non-limiting example.
- the capacitors C2 and C3 could be 1.5 and 0.68 microhenry capacitors in one non-limiting example.
- the RF filters as described could be RF ferrite beads, serially connected inductors, or shunt capacitors or a combination of both.
- an isolation RF shield as a "can” could surround and isolate the microphone or speaker from radiating energy depending on the design, whether the whole circuit as shown at 32a and 46a or the transducer at 32b and 46b in FIGS. 3 and 4.
- ferrite beads can be used.
- a ferrite bead is formed from a material having a permeability controlled by the composition of the different oxides, for example, a ferric oxide, sometimes with nickel and zinc added.
- the ferrite beads can sometimes be formed as ferrite sleeves with two half parts that are added onto a signal line or a solder overcoat on a signal trace.
- the bead equivalent circuit can be a series resistor and inductor.
- FIGS. 2-4 can be formed as an integrated circuit or contained within a housing or contained on a dielectric substrate, i.e., a circuit board.
- a circuit board could refer to any dielectric substrate, PCB, ceramic substrate or other circuit carrying structures for carrying signal circuits in electronic components.
- a battery (not illustrated) could be included within any housing for the earphone.
- RF and EMI filters as described relative to FIGS. 2-4 can be used in many different types of hearing aids. It should be understood that many different types of hearing aid designs can be used because of the nature of hearing losses that occur for humans such as explained with reference to FIGS. 5 and 6.
- FIG. 5 shows a threshold of hearing as a function of frequency for a person with normal hearing and a threshold of discomfort as a function of frequency. Any sounds that extend beyond the threshold are painful and sometimes harmful.
- FIG. 6 shows the same two curves when a person has hearing loss, but there are many different types of hearing loss.
- the threshold of hearing becomes higher for different types of hearing loss and for a normal ear, but the threshold of discomfort increases or is unchanged.
- the loudness at any frequency is typically the same for those with and without hearing loss, i.e., commonly referred to as loudness recruitment.
- the filters as described can be used with those type of more simple hearing aids that provide linear amplification, with frequency-dependent gain, and those type of hearing aids that compress the dynamic range of sound at any frequency to fit a reduced dynamic range because of the hearing loss.
- complicated filters that are used to filter a speech signal to a number of bands can include the RF and EMI filters as described for multiband compression systems.
- Different types of amplifiers can be used such as classes A, B, D, sliding class A, class H and other digital amplifiers.
- Different types of compression circuits including an output limiting compression that has a high compression knee point; a dynamic range compression that compresses input levels into a narrow dynamic range using a low knee point; a multi-channel compression having different compression ratios and knee points for the frequencies between 500-2,000 Hz and high knee points and ratios of output limiting applied for frequencies above 2,000 Hz; BILL in which low frequencies increase at quiet intensity levels and reduce at high intensity levels; TILL that is the opposite of BILL where high frequencies increase at low levels and reduce at high levels; and PILL in which programmable instruments reduce either lows, highs, or both lows and highs and are a combination of both BILL and TILL.
- Different types of digital processing circuits can be used.
Abstract
Description
- This invention relates to hearing aids, and more particularly, this invention relates to hearing aids that include filters for improving RF immunity to RF electromagnetic interference.
- When some mobile wireless communications devices or other wireless communications devices are used near some hearing aid devices, for example, a cochlear implant or a behind-the-ear (BTE) hearing aid having a tone hook and earmold, users often detect a buzzing, humming or whining noise, or other unwanted audible noise such as a Global System for Mobile communications (GSM) buzz, which can be annoying to users. Some hearing aids are more immune than others and have appropriate filters for suppressing this interference noise, while some phones vary in the amount of interference they generate.
- The wireless telephone industry has developed ratings for some mobile phones to assist hearing aid users in finding a phone that is more compatible with their hearing aid. Not all phones have been rated, however, but typically, a phone should have a rating listed on its box or on a label on the box. These ratings are not guarantees and some results vary depending on the type of hearing aid and user hearing loss. Some ratings use an M-ratings scale with phones rated M3 or M4 meeting FCC requirements that are likely to generate less interference to hearing aids than phones that are not labeled. M4 is a higher rating. A T-ratings scale occurs with phones rated T3 or T4 meeting FCC requirements, and likely to be useable with a hearing aid telecoil ("T-switch" or "telephone switch") than unrated phones. T4 is the better quality. Some hearing aid devices, however, do not include telecoils. Also, some hearing aids can be measured for immunity to this type of interference.
- In accordance with one non-limiting example, RF filters and RF shielding techniques can be implemented in a microphone circuit or speaker of a hearing aid. These types of filters and shielding can also be supplied to a power supply circuit and other circuits in a hearing aid to reduce the RF coupling from the wireless communications device to those circuits in the hearing aid, causing an audible unwanted noise, such as GSM buzz.
- In accordance with one non-limiting embodiment, the hearing aid has improved immunity to RF electromagnetic interference produced from wireless communications devices, for example, cellular telephones. A microphone receives audio or acoustic signals from the environment. Audio circuitry is connected to the microphone and amplifies the audio signals. A speaker is connected to the audio circuitry and directs the audio or acoustic signals into an ear of a user using the hearing aid. Audio connection lines connect the microphone and audio circuitry and the speaker and audio circuitry. A filter is connected into each of the audio connection lines and operative for reducing the RF coupling from a wireless communications device.
- In another aspect, a filter is serially connected into each audio connection line and can be formed as a ferrite inductor or ferrite bead. The filter could be formed as an LC filter serially connected into each audio connection line. A second filter element could be connected into the audio connection line that is connected to the speaker, and serially connected to another filter. The second filter element could be formed as a ferrite inductor.
- In yet another aspect, an RF shield could surround one of at least a speaker or microphone to aid in reducing the RF coupling from a wireless communications device. The RF shield could be formed as a metallic housing. A hearing aid housing could support the microphone, speaker and audio circuitry. A tone hook could be connected to the hearing aid housing for receiving audio signals from the speaker. An earmold could be connected to the tone hook and adapted to be inserted within the ear of a user.
- In yet another aspect, a microphone bias line connects the microprocessor and microphone for carrying microphone bias control signals between the microprocessor and the microphone. A microphone bias filter is connected into each of the microphone bias lines for reducing the RF coupling from a wireless communications device. A method aspect is also set forth.
- Other objects, features and advantages of the present invention will become apparent from the detailed description of the invention which follows, when considered in light of the accompanying drawings in which:
- FIG. 1 is a perspective view of a behind-the-ear (BET) hearing aid that includes an earmold for ear insertion with the audio circuitry and other components, including a filter for reducing RF electromagnetic interference produced from a wireless communications device.
- FIG. 2 is a block diagram showing basic functional components of a hearing aid that could be adapted to incorporate a filter to decrease unwanted audible noise, such as GSM buzz, and any electromagnetic interference produced from a wireless communications device.
- FIG. 3 is a schematic circuit diagram showing a combination microphone and filter circuit, which could be incorporated into the microphone shown in FIG. 2.
- FIG. 4 is a schematic circuit diagram showing a combination speaker and filter circuit, which could be incorporated into the speaker shown in FIG. 2.
- FIG. 5 is a graph showing a threshold of hearing and discomfort for a typical normal ear.
- FIG. 6 is a typical threshold of hearing and discomfort for an ear with some hearing loss.
- Different embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown. Many different forms can be set forth and described embodiments should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope to those skilled in the art. Like numbers refer to like elements throughout, and prime notation is used to indicate similar elements in alternative embodiments.
- The embodiments as described address the RF interference produced from a wireless communications device, for example, a cellular phone to a hearing aid. This interference can cause unwanted audible noise, such as GSM buzz, which can be annoying to users. Currently, cell phone manufacturers are required to meet the Federal Communications Commission (FCC) requirements for hearing aid compatibility (HAC). The embodiments as described target the hearing aid side of the problem instead of concentrating on cell phone compatibility.
- As is known to those skilled in the art, a typical hearing aid includes a microphone, amplifier, volume control, an earphone (receiver), power source, and some type of coupling to the ear such as an earmold. The microphone takes the incoming signal and filters it to provide a respective frequency response. Amplifiers take the resulting signal and make it louder. A receiver converts the signal back into an acoustical form of the signal that the ear can hear.
- A hearing aid is shown in FIG. 1 at 10 and designed and configured as a behind-the-ear (BTE) hearing aid. It should be understood that all different types of hearing aids can be used with the RF filtering as will be described, including hearing aids that are inserted directly into the ear canal of a user, for example, a cochlear implant, or supported by the ears as shown in the BTE hearing aid of FIG. 1.
- The
hearing aid 10 typically includes ahearing aid housing 12, having audio circuitry within the housing and indicated by a dashed line at 13, and abattery compartment 14 for holding a battery for powering the audio circuitry. An on/offswitch 16 allows on/off operation to be user controlled. Avolume control 18 allows user control over the amount of amplification or sound amplitude heard through the ear. Themicrophone 20 andspeaker 22 are shown at an end of the hearing aid. Atone hook 24 extends from thespeaker 22 and includes anearmold 26 connected thereto that has a hearing insert that is adapted to be inserted within the ear canal of a user. - FIG. 2 is a block diagram of a
typical hearing aid 30, including themicrophone 32 that receives acoustical or audio signals from the environment. The analog voltage signals produced at the microphone by the transducer as Vin_P and Vin_N signals are input into alow pass filter 34 and digitally converted by an analog-to-digital converter 36 after low pass filtering. After conversion, the digital signals are processed at a digital signal processor (DSP) 38 with standard digital signal processing techniques. Amicroprocessor 40 is operative with theDSP 38 and the microprocessor transmits microphone bias control signals over microphone bias lines as a microphone bias (MIC_BIAS) and supplementary microphone voltage (MIC_VSUP) line. Signals are transferred back to the microphone in a closed loop system as illustrated at 41 in FIG. 2. After digital signal processing atDSP 38, the digital signal is processed in a digital-to-analog filter 42 and filtered in alow pass filter 44. The voltage signals from thelow pass filter 44 as Vout_P and Vout_N are transferred to thespeaker 46, which could be connected to an earmold that is inserted within the ear or as part of a cochlear implant or BTE hearing aid. - FIGS. 3 and 4 illustrate the type of electromagnetic interference (EMI) filters that can be used with the microphone 32 (FIG. 3) and the speaker 46 (FIG. 4). As shown in FIG. 3, the microphone is formed as an
overall microphone circuit 32 having an output into thelow pass filter 34 as Vin_P and Vin_N, and four capacitors C1, C2, C3, C4 and two inductors L1, L2. A first and second capacitor C1, C2 are connected parallel into the Vin_P and Vin_N lines. Serially connected capacitors C3, C4 and inductors L1, L2 are connected in each line. A feedback circuit from the microprocessor as a microphone bias line includes an inductor L3, L4 and grounded capacitor C5, C6 in each line, followed by another grounded capacitor C7, C8 in each line as it enters the microphone as illustrated. The entire circuit as described could be enclosed with anRF shield 32a, or just the transducer area of the microphone shown by the dashedlines 32b. - FIG. 4 shows a filter for the speaker illustrating the Vout_P and Vout_N audio connection lines. Each line includes serially connected ferrite inductor elements L1, L2, L3 and L4, resistor elements R1, R2, and non-ferrite inductor elements L5, L6. Four parallel capacitors C1, C2, C3 and C4 are connected as illustrated. The ferrite inductors L1, L2, L3 and L4 can be formed as a ferrite bead. The non-fernte inductor L5, L6 in each line can be formed as a 680 microhenry inductor in one non-limiting example. The resistors R1, R2 can be 28 ohm resistors in one non-limiting example. The capacitors C2 and C3 could be 1.5 and 0.68 microhenry capacitors in one non-limiting example.
- The RF filters as described could be RF ferrite beads, serially connected inductors, or shunt capacitors or a combination of both. In another aspect, an isolation RF shield as a "can" could surround and isolate the microphone or speaker from radiating energy depending on the design, whether the whole circuit as shown at 32a and 46a or the transducer at 32b and 46b in FIGS. 3 and 4.
- Different types, sizes and shapes of ferrite beads can be used. Typically, a ferrite bead is formed from a material having a permeability controlled by the composition of the different oxides, for example, a ferric oxide, sometimes with nickel and zinc added. The ferrite beads can sometimes be formed as ferrite sleeves with two half parts that are added onto a signal line or a solder overcoat on a signal trace. Typically, the longer the bead, the better the RF suppression. The bead equivalent circuit can be a series resistor and inductor.
- Many of the illustrated components of FIGS. 2-4 can be formed as an integrated circuit or contained within a housing or contained on a dielectric substrate, i.e., a circuit board. A circuit board could refer to any dielectric substrate, PCB, ceramic substrate or other circuit carrying structures for carrying signal circuits in electronic components. A battery (not illustrated) could be included within any housing for the earphone.
- It should be understood that the RF and EMI filters as described relative to FIGS. 2-4 can be used in many different types of hearing aids. It should be understood that many different types of hearing aid designs can be used because of the nature of hearing losses that occur for humans such as explained with reference to FIGS. 5 and 6.
- FIG. 5 shows a threshold of hearing as a function of frequency for a person with normal hearing and a threshold of discomfort as a function of frequency. Any sounds that extend beyond the threshold are painful and sometimes harmful.
- FIG. 6 shows the same two curves when a person has hearing loss, but there are many different types of hearing loss. Typically, the threshold of hearing becomes higher for different types of hearing loss and for a normal ear, but the threshold of discomfort increases or is unchanged. At high intensities, the loudness at any frequency is typically the same for those with and without hearing loss, i.e., commonly referred to as loudness recruitment. The filters as described can be used with those type of more simple hearing aids that provide linear amplification, with frequency-dependent gain, and those type of hearing aids that compress the dynamic range of sound at any frequency to fit a reduced dynamic range because of the hearing loss. Thus, complicated filters that are used to filter a speech signal to a number of bands can include the RF and EMI filters as described for multiband compression systems.
- Different types of amplifiers can be used such as classes A, B, D, sliding class A, class H and other digital amplifiers. Different types of compression circuits including an output limiting compression that has a high compression knee point; a dynamic range compression that compresses input levels into a narrow dynamic range using a low knee point; a multi-channel compression having different compression ratios and knee points for the frequencies between 500-2,000 Hz and high knee points and ratios of output limiting applied for frequencies above 2,000 Hz; BILL in which low frequencies increase at quiet intensity levels and reduce at high intensity levels; TILL that is the opposite of BILL where high frequencies increase at low levels and reduce at high levels; and PILL in which programmable instruments reduce either lows, highs, or both lows and highs and are a combination of both BILL and TILL. Different types of digital processing circuits can be used.
- Many modifications and other embodiments of the invention will come to the mind of one skilled in the art having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is understood that the invention is not to be limited to the specific embodiments disclosed, and that modifications and embodiments are intended to be included within the scope of the appended claims.
Claims (20)
- A hearing aid having improved immunity to RF electromagnetic interference produced from wireless communications devices comprising:a microphone for receiving audio signals from the environment;audio circuitry connected to the microphone for amplifying the audio signals;a speaker connected to said audio circuitry for directing the audio signals into an ear of a user using the hearing aid, and further comprising audio connection lines connecting the microphone and audio circuitry and the speaker and audio circuitry; anda filter connected into each of the audio connection lines and operative for reducing the RF coupling from a wireless communications device.
- A hearing aid according to Claim 1, wherein a filter is serially connected into each audio connection line.
- A hearing aid according to Claim 1, wherein a filter comprises a ferrite inductor.
- A hearing aid according to Claim 1, wherein a filter comprises a ferrite bead.
- A hearing aid according to Claim 1, wherein a filter comprises an LC filter serially connected into each audio connection line.
- A hearing aid according to Claim 1, and further comprising a second filter element connected into an audio connection line connected to said speaker, and serially connected to a filter connected into the audio connection line.
- A hearing aid according to Claim 6, wherein said second filter element comprises a ferrite inductor.
- A hearing aid according to Claim 1, and further comprising an RF shield surrounding one of at least the speaker or microphone to aid in reducing the RF coupling from a mobile wireless communications device.
- A hearing aid according to Claim 8, wherein said RF shield comprises a metallic housing.
- A hearing aid according to Claim 1, and further comprising a hearing aid housing that supports said microphone, speaker and audio circuitry.
- A hearing aid according to Claim 10, and further comprising a tone hook connected to said hearing aid housing for receiving audio signals from the speaker, and an earmold connected to said tone hook and adapted to be inserted within the ear of a user.
- A hearing aid according to Claim 1, and further comprising microphone bias lines connecting the microprocessor and microphone for carrying microphone bias control signals between the microprocessor and the microphone and a microphone bias filter connected into the microphone bias lines for reducing the RF coupling from a wireless communications device.
- A hearing aid according to Claim 12, wherein said microphone bias filter comprises a serial inductor or shunt capacitor.
- A hearing aid according to Claim 12, wherein said microphone bias filter comprises a ferrite bead.
- A hearing aid according to Claim 12, wherein said microphone bias filter comprises a ground connected capacitor connected into each microphone bias line.
- A method of making a hearing aid having improved immunity to RF electromagnetic interference produced from wireless communications devices, which comprises:providing a microphone for receiving audio signals from the environment, audio circuitry connected to the microphone for amplifying the audio signals, and a speaker connected to said audio circuitry for directing the audio signals into an ear canal of a user of the hearing aid, comprising audio connection lines connecting the microphone and audio circuitry and the speaker and audio circuitry; andreducing the RF coupling from a wireless communications device by connecting a filter into audio connection lines that connect the speaker and microphone with the audio circuitry.
- A method according to Claim 16, which further comprises enclosing one of at least the microphone or speaker within an RF shield for reducing the RF coupling from a mobile wireless communications device.
- A method according to Claim 16, which further comprises connecting a filter serially into an audio connection line.
- A method according to Claim 16, which further comprises connecting a ferrite bead into an audio connection line.
- A method according to Claim 16, which further comprises connecting a microphone bias filter into microphone bias lines that pass microphone bias control signals between the audio circuitry and the microphone.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05257370A EP1793649B1 (en) | 2005-11-30 | 2005-11-30 | Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device |
DE602005010883T DE602005010883D1 (en) | 2005-11-30 | 2005-11-30 | Hearing aid with improved immunity to electromagnetic interference generated by a wireless communication device |
AT05257370T ATE413790T1 (en) | 2005-11-30 | 2005-11-30 | HEARING AID WITH IMPROVED INSENSITIVITY TO ELECTROMAGNETIC INTERFERENCE PRODUCED BY A WIRELESS COMMUNICATIONS DEVICE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05257370A EP1793649B1 (en) | 2005-11-30 | 2005-11-30 | Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1793649A1 true EP1793649A1 (en) | 2007-06-06 |
EP1793649B1 EP1793649B1 (en) | 2008-11-05 |
Family
ID=36097315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05257370A Active EP1793649B1 (en) | 2005-11-30 | 2005-11-30 | Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1793649B1 (en) |
AT (1) | ATE413790T1 (en) |
DE (1) | DE602005010883D1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19602453C1 (en) * | 1996-01-24 | 1997-07-03 | Siemens Audiologische Technik | Electronic hearing aid with HF electromagnetic protection |
DE19724491A1 (en) * | 1996-12-12 | 1998-07-02 | Siemens Audiologische Technik | Microphone for electric hearing aid |
US6104821A (en) * | 1996-10-02 | 2000-08-15 | Siemens Audiologische Technik Gmbh | Electrical hearing aid device with high frequency electromagnetic radiation protection |
US6546109B1 (en) * | 2000-01-03 | 2003-04-08 | Louis Thomas Gnecco | Electromagnetically shielded hearing aids |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0500988B1 (en) * | 1991-02-27 | 1995-02-22 | Siemens Audiologische Technik GmbH | Hearing aid to be worn on the head |
-
2005
- 2005-11-30 DE DE602005010883T patent/DE602005010883D1/en active Active
- 2005-11-30 AT AT05257370T patent/ATE413790T1/en not_active IP Right Cessation
- 2005-11-30 EP EP05257370A patent/EP1793649B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19602453C1 (en) * | 1996-01-24 | 1997-07-03 | Siemens Audiologische Technik | Electronic hearing aid with HF electromagnetic protection |
US6104821A (en) * | 1996-10-02 | 2000-08-15 | Siemens Audiologische Technik Gmbh | Electrical hearing aid device with high frequency electromagnetic radiation protection |
DE19724491A1 (en) * | 1996-12-12 | 1998-07-02 | Siemens Audiologische Technik | Microphone for electric hearing aid |
US6546109B1 (en) * | 2000-01-03 | 2003-04-08 | Louis Thomas Gnecco | Electromagnetically shielded hearing aids |
Also Published As
Publication number | Publication date |
---|---|
DE602005010883D1 (en) | 2008-12-18 |
ATE413790T1 (en) | 2008-11-15 |
EP1793649B1 (en) | 2008-11-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8644539B2 (en) | Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device | |
US7043041B2 (en) | Integrated telecoil amplifier with signal processing | |
US5640457A (en) | Electromagnetically shielded hearing aid | |
AU2006276187B2 (en) | Audio signal system | |
US7657046B2 (en) | IC chip type hearing aid module for mobile communication terminal | |
WO2005036922A1 (en) | Communication headset with signal processing capability | |
USRE43519E1 (en) | Electromagnetically protected hearing aids | |
US7657049B2 (en) | Telephone handset | |
WO2006073607A1 (en) | Multifunction preamplifier microphone | |
US7584010B2 (en) | Telephone handset | |
JP5322485B2 (en) | Listening device, listening system, and operating method of listening device | |
EP2992688B1 (en) | Increasing antenna performance for wireless hearing assistance devices | |
EP1793649B1 (en) | Hearing aid having improved RF immunity to RF electromagnetic interference produced from a wireless communications device | |
US7646865B2 (en) | Telephone handset coupling system | |
US7813100B2 (en) | Demagnetization circuit of a mobile phone | |
CN114765723A (en) | Hearing device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20051221 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK YU |
|
17Q | First examination report despatched |
Effective date: 20070921 |
|
AKX | Designation fees paid |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
AXX | Extension fees paid |
Extension state: BA Payment date: 20071204 Extension state: YU Payment date: 20071204 Extension state: AL Payment date: 20071204 Extension state: MK Payment date: 20071204 Extension state: HR Payment date: 20071204 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK YU |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 602005010883 Country of ref document: DE Date of ref document: 20081218 Kind code of ref document: P |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
LTIE | Lt: invalidation of european patent or patent extension |
Effective date: 20081105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090216 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090305 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090205 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090205 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090406 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 |
|
26N | No opposition filed |
Effective date: 20090806 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081130 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090506 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090206 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081105 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 602005010883 Country of ref document: DE Representative=s name: MERH-IP MATIAS ERNY REICHL HOFFMANN, DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R081 Ref document number: 602005010883 Country of ref document: DE Owner name: BLACKBERRY LIMITED, WATERLOO, CA Free format text: FORMER OWNER: RESEARCH IN MOTION LTD., WATERLOO, ONTARIO, CA Effective date: 20140925 Ref country code: DE Ref legal event code: R082 Ref document number: 602005010883 Country of ref document: DE Representative=s name: MERH-IP MATIAS ERNY REICHL HOFFMANN, DE Effective date: 20140925 Ref country code: DE Ref legal event code: R082 Ref document number: 602005010883 Country of ref document: DE Representative=s name: MERH-IP MATIAS ERNY REICHL HOFFMANN PATENTANWA, DE Effective date: 20140925 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 11 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20231127 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20231127 Year of fee payment: 19 Ref country code: DE Payment date: 20231129 Year of fee payment: 19 |