DK176533B1

DK176533B1 - Electric hearing aid with protection against electromagnetic waves

Info

Publication number: DK176533B1
Application number: DK8797A
Authority: DK
Inventors: Kunibert Husung
Original assignee: Siemens Audiologische Technik
Priority date: 1996-01-24
Filing date: 1997-01-23
Publication date: 2008-07-21
Also published as: CH691650A5; DK8797A; DE19602453C1

Description

DK 176533 B1 - | -DK 176533 B1 - | -

Opfindelsen angår et elektrisk høreapparat med et hus, i hvilket der er anbragt et forstærkerkredsløb, søm omfatter mindst én mikrofon samt koblings- og/eller tilslutningsmidler og en spændingskilde, hvorved der til forstærkerkredsløbet yderligere hører mindst én lydgiver, og hvorved der findes en beskyttelsesanordning, som er udformet mod højfrekvente elektromagnetiske bølger.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to an electric hearing aid with a housing in which an amplifier circuit is arranged, the seam comprising at least one microphone and coupling and / or connecting means and a voltage source, whereby the amplifier circuit further includes at least one sound emitter, and wherein there is a protective device, which are designed against high frequency electromagnetic waves.

Fra DF-43 4-3 703 Cl kendes der et på hovedet bærbart høreapparat, som har en beskytteisesanordning til høreapparat-forstærkerkredsløb til forbedring af støjimmuniteten over for elektromagnetisk ekstern stråling, højfrekvente elektromagnetiske bølger el.lign. Denne beskyttelsesanordning er udformet som elektrisk ledende afskærmning af io forstærkerkredstøbet mod højfrekvente elektromagnetiske bølger således, at der opstår hvirvelstrømme, når elektromagnetiske bølger rammer denne beskyttelsesanordning. Derved formindskes i det mindste de elektromagnetiske bølgers feltstyrke på den fra senderen bortvendte side af beskyttdsesanørdningen. Denne beskyttelsesanordnings virkning som elektrisk ledende afskærmning af forstærkerkredsløbet kan være udvidet is ved, at beskyttelsesanørdningen har mindst én ledende forbindelse til en elektrisk tilslutning af forstærkerkredsløbet, hvorved denne ledende forbindelse fx. føres via en kondensator, som danner en tilstrækkeligt lav reaktans til højfrekvens.From DF-43 4-3 703 Cl, a head-wearing hearing aid is known which has a hearing aid amplifier circuit for improving noise immunity to electromagnetic external radiation, high frequency electromagnetic waves or the like. This protection device is designed as electrically conductive shielding of the amplifier circuit against high frequency electromagnetic waves so that eddy currents occur when electromagnetic waves strike this protection device. This reduces at least the field strength of the electromagnetic waves on the side facing away from the transmitter of the protective device. The effect of this protective device as electrically conductive shielding of the amplifier circuit may be expanded ice in that the protective device has at least one conductive connection to an electrical connection of the amplifier circuit, whereby this conductive connection e.g. is conducted via a capacitor which generates a sufficiently low reactance for high frequency.

Et på høvedet bærbart høreapparat med et hus. i hvilket der er anbragt i det mindste én mikrofon, et forstærker- og overføringskredsløb, en lydgiver og en strømkilde, er 20 genstand før den ældre tyske patentansøgning 195 44 345.4. For at forbedre støjimmuniteten øver for dette høreapparats højfrekvente elektromagnetiske støj signaler er det foreslået, at forstærker- og overføringskredsløbets aktive elementer har en elektromagnetisk afskærmning.A head-mounted portable hearing aid with a housing. in which at least one microphone, an amplifier and transmission circuit, a sound transducer and a power source are provided, is the object of the earlier German patent application 195 44 345.4. In order to improve the noise immunity practiced by this hearing aid's high frequency electromagnetic noise signals, it is suggested that the active elements of the amplifier and transmission circuit have an electromagnetic shield.

Det er opfindelsens opgave at forbedre beskyttelsesanørdningen mød elektromagnets tisk interferensstråling på et høreapparat af den indledningsvis nævnte type.It is the object of the invention to improve the protective device against the electrical interference radiation of the electromagnet on a hearing aid of the type mentioned above.

Denne opgave løses med de ejendommeligheder, søm er angivet i patentkrav 1. Ifølge opfindelsen opnås der en formindskelse af common-mode indstrålingen og dermed en væsentlig forøgelse af høreapparatets EMC-styrke ved at aflede FIF-strømmene fra HF-filtermidleme til en virtuel stelforbindelse. Et høreapparat kan normalt ikke afskær-» mes fuldstændigt metallisk mod elektromagnetisk interferensstråling, da der nødvendigvis findes forskellige åbninger på apparatet, eksempelvis til betjeningselementer, til en programmeringsbøsning, til en audio-indgang osv. Blokeringsforanstaitninger mod støj-påvirkninger på høreapparatets indgange med HF-kondensatører fører imidlertid hyppigt til HF-strømme i kredsløbssteilet og dermed til funktionsforstyrrelser i høreapparatet, jj Ved udformningen af høreapparatet ifølge opfindelsen og anvendelsen af en virtuel stelforbindelse kan disse forstyrrende HF-strømme holdes væk fra signalbehandlingskredsløbet. ifølge et forslag i forbindelse med opfindelsen føres høreapparatets HF-føl- -2- DK 176533 B1 somtrte elektriske ledninger (indgangsledninger, batter; kon takter osv.) via HF-fd terns idler til den virtuelle stel forbindelse, for at der sker en afledning af HF-strømmene til denne ekstra stelforbindelse. Den virtuelle stel forbi ndel se har ingen galvanisk forbindelse til kredsløbsstellet og bør være meget lavohmsk og så vidt muligt med stor flade. Den s virtuelle stelforbindelse kan muligvis integreres på forstærkerkredsløbets printkort i høreapparatet. En anden udførelsesform består i at tage husafskærmninger af høreapparatets komponenter med i høreapparatets beskyttelsesanordning mod højfrekvente elektromagnetiske bølger, idet HF-filtermidierne forbindes med høreapparat-komponentens ledende hus.This problem is solved by the properties of seams set forth in claim 1. According to the invention, a reduction in the common-mode radiation and thus a substantial increase in the hearing aid's EMC strength is achieved by diverting the FIF currents from the HF filter means to a virtual ground connection. A hearing aid cannot normally be completely shielded completely from electromagnetic interference radiation, since there are necessarily different openings on the device, for example for controls, for a programming connector, for an audio input, etc. capacitors, however, frequently lead to HF currents in the circuit board and thus to malfunctioning of the hearing aid. In designing the hearing aid according to the invention and using a virtual grounding connection, these disturbing HF currents can be kept away from the signal processing circuit. In accordance with a proposal in connection with the invention, the HF sensors' electrical sensors (input wires, batteries; contacts, etc.) are routed through the HF sensor's wires to the virtual ground connection for a lead-in connection. of the HF currents for this extra grounding connection. The virtual frame pastel has no galvanic connection to the circuit frame and should be very low ohmic and as far as possible with a large surface. The virtual grounding connection may be integrated on the amplifier circuit board into the hearing aid. Another embodiment consists of incorporating housing shields of the hearing aid components into the hearing aid's protective device against high frequency electromagnetic waves, connecting the HF filter media to the conductor component conductor housing.

jo Yderligere fordele og enkeltheder ved opfindelsen fremgår af den efterfølgende be skrivelse af udførelseseksempler ved hjælp af tegningerne og i forbindelse med kravene.Further advantages and details of the invention will become apparent from the following description of embodiments by way of example and in conjunction with the claims.

På tegningen viser: fig. 1 et blokdiagram øver et høreapparat ifølge opfindelsen, hvorved s der til forstærker- og overføringskredsløbets aktive kompo nenter hører HF-filtermidler, som er forsynet med elektriske afledninger til HF-strømmene til en stelforbindelse, som danner et potential, tig. 2 en mikrofon i høreapparatet ifølge opfindelsen med et elektrisk » ledende hus og med HF-filtermidler til forøgelse af EMC-styr- ken, fig. 3 et forenklet ledningsdiagram til tilslutningen af et kredsløb i høreapparatet til en spændingskilde med HF-filtermidler, som er tilsluttet til en stelforbindelse, som danner et potential, 25 fig, 4 et forenklet ledningsdiagram til tilslutningen af en lydstyrke- regulator (potentiometer) til et høreapparat-kredslob, hvorved der er anbragt HF-filtermidler i elektriske forbindelsesledninger, og deres elektriske afledninger er tilsluttet dl stelfor-bindelsen, som danner et potential, » fig. 5 en lydgiver i et høreapparat ifølge opfindelsen med et elektrisk ledende hus og med HF-filiermidler til forøgelse af EMC-styr-ken, fig. 6 et forenklet ledningsdiagram til den elektriske tilslutning af en programmeringsbøsning eller en audio-indgang til høreapparat-35 kredsløbet, hvorved der er anbragt HF-filtermidler i forbin delsesledningerne, og deres elektriske afledninger til HF- - 3 - DK 176533 B1 strømmene er tilsluttet ti! stelforbindelsen, som danner et potential, fig, 7 en udførelse af et HF-filtermiddd som passivt filter af første orden øg fig. 8 et udførelse af et HF-filtermiddel som passivt filter af anden orden,In the drawing: FIG. 1 is a block diagram of a hearing aid according to the invention, whereby the active components of the amplifier and transmission circuit belong to HF filter means, which are provided with electrical leads to the HF currents for a grounding connection which forms a potential. 2 shows a microphone in the hearing aid according to the invention with an electrically conductive housing and with HF filter means for increasing the EMC strength; FIG. Fig. 3 is a simplified wiring diagram for connecting a circuit in the hearing aid to a voltage source with HF filter means connected to a grounding connection forming a potential; Figs. 4 a simplified wiring diagram for connecting a volume controller (potentiometer) to a a hearing aid circuit, whereby HF filter means are arranged in electrical connection lines and their electrical leads are connected to the ground connection, which creates a potential, "FIG. 5 shows a sound emitter in a hearing aid according to the invention with an electrically conductive housing and with HF filament means for increasing the EMC strength; FIG. 6 is a simplified wiring diagram for the electrical connection of a programming socket or audio input to the hearing aid circuit, whereby HF filter means are disposed in the connecting wires and their electrical wiring to the HF-3 is connected to the ! Fig. 7 shows an embodiment of a HF filter medium as a passive filter of the first order increasing fig. 8 shows an embodiment of an HF filter agent as a second order passive filter,

Ved høreapparatet ifølge opfindelsen kan det dreje sig om et lommehøreapparat eller øm et på hovedet bærbart høreapparat, hvorved det sidstnævnte kan være et bag io ved øret bærbart høreapparat (ørehænger) eller et i øret bærbart høreapparat (i-øret-appa-rat). Sådanne elektriske høreapparater har et hus 1, i hvilket der er anbragt en mikrofon 3 eller alt efter udførelse også to mikrofoner eller en mikrofon og en ikke tegnet induktionsspole (telefonspole). Ved høreapparatet ifølge fig, 1 er der også anbragt en lydgiver 7 i høreapparathuset 1, hvorved der i signalvejen mellem lydomformeme 3, 7 befinder is sig et forstærker- og overføringskredsløb 2, til hvilket der eksempelvis hører en forforstærker 24, en signalfilter-blok 25 øg et koblingsmiddel 4 til forstærkningsindstilling (lydstyrkeregulator). En spændingskilde 6, som ligeledes er placeret i huset 1, fx. et batteri eller en akkumulator, tjener til energiforsyning af Sydomformenie 3, 7 og kredsløbets 2 aktive yderligere komponenter.The hearing aid according to the invention may be a pocket hearing aid or a head-wearing hearing aid, the latter being a rear hearing aid (ear hanger) or an in-ear hearing aid (in-ear device). Such electric hearing aids have a housing 1 in which a microphone 3 or, depending on the embodiment, also includes two microphones or a microphone and a non-drawn induction coil (telephone coil). In the hearing aid according to Fig. 1, there is also provided a sound transducer 7 in the hearing aid housing 1, whereby in the signal path between the sound converters 3, 7 is an amplifier and transfer circuit 2, to which, for example, a preamplifier 24, a signal filter block 25, belongs. increase a switching means 4 for gain setting (volume control). A voltage source 6 which is also located in the housing 1, e.g. a battery or accumulator, serves to supply energy to Sydformenie 3, 7 and the active additional components of circuit 2.

jo For at forøge EMC-styrken er der ved høreapparatet ifølge udførelseseksemplet på fig. 1 anbragt HF-filtermidler 13-17 i de HF-følsomme elektriske ledningsforbindelser 8-12, nemlig mellem mikrofonen 3 og forforstærkeren 24, mellem forforstærkeren 24 og signalfilteret 25, mellem signalfilteret og koblingsmidlet 4, mellem kobiingsmidiet 4 og lydgiveren 7 samt mellem spændingskilden 6 og forstærkerkredsløbet 2, For at i HF-fil-» termidleme opstående HF-strømme ikke kan føre til funktionsforstyrrelser af høreapparatet i kredsløbssteilet, afledes sådanne HF-strømme til mindst én virtuel stelforbindelse 23 via HF-filtermidlemes elektriske afledninger 18-22. Derved er det muligt, at et metallisere! eller metallisk hus 1 eller et sådant husafsnit af høreapparatet anvendes som stel forbinde! sen 23, der danner et potential. På den anden side kan et hus 1, som består 3o af kunststof, til dette formål forsynes med et elektrisk ledende overtræk, en metalfolie-belægning eller -foring.yes To increase the EMC strength, at the hearing aid according to the embodiment of FIG. 1, HF filter means 13-17 are arranged in the HF-sensitive electrical wiring 8-12, namely between the microphone 3 and the preamplifier 24, between the preamplifier 24 and the signal filter 25, between the signal filter and the coupling means 4, between the coupling medium 4 and the sound transducer 7 and between the voltage source 6 and the amplifier circuit 2, In order that HF currents generated in the HF files cannot cause malfunction of the hearing aid in the circuit board, such HF currents are diverted to at least one virtual grounding connection 23 via the electrical leads 18-22 of the HF filter means. This makes it possible to metallize! or metallic housing 1 or such housing portion of the hearing aid is used as a grounding connector! late 23, forming a potential. On the other hand, a housing 1 made of plastic can be provided for this purpose with an electrically conductive coating, a metal foil coating or liner.

En hensigtsmæssig placering med hensyn til den foreliggende beskyttelsesanordning består i, at der er anbragt mindst ét HF-filtermiddel 13 i ledningsforbindelsen 8 mellem mikrofonen 3 og forforstærkeren 24 umiddelbart på mikrofon-signaludgangen 35 øg/eiler umiddelbart foran forforstærker-signalindgangen. I en udformning kan HF-fil-termidlet eksempelvis ved et lommehøreapparat med ekstern lydgiver høre til udgangen på forstærkerkredsløbet i høreapparatet, eller ved et på hovedet bærbart høreapparat, .. 4 ...A convenient location with respect to the present protective device consists in that at least one HF filter means 13 is placed in the conduit connection 8 between the microphone 3 and the preamplifier 24 immediately at the microphone signal output 35 boost / s immediately in front of the preamplifier signal input. In one embodiment, the HF-file term may, for example, belong to the output of the amplifier circuit in the hearing aid, or to a head-mounted hearing aid, by means of a pocket hearing aid with an external sound emitter.

DK 176533 B1 som er udstyret med en aktiv lydgiver, kan HF-filtermidlet findes på lydgiverens signalindgang.DK 176533 B1 which is equipped with an active sound sensor, the HF filter means can be found at the sound input of the sound sensor.

I en ændret udførelse kan en understøtning af forstærkerkredsløbet 2 også have en ekstra stelforbindelsesposition i et printkort i forstærkerkredsløbet til den virtuelle stel-i forbindelse.In a modified embodiment, a support for the amplifier circuit 2 may also have an additional grounding connection position in a circuit board of the virtual circuit amplifier circuit.

Som de yderligere udførelseseksempler viser, kan beskyttelsesanordningen ifølge opfindelsen også være henført til enkelte komponenter i høreapparatet. Søm det fremgår af fig. 2, findes der en mikrofon 30 til høreapparatet, som udmærker sig ved et elektrisk ledende hus 31, en signal modtagelse 32 og en impedansomformer 33, som fortrinsvis (o medomfatter en forstærker. For at forøge denne mikrofons EMC-styrke er der anbragt HF-filtermidler 40-42 i tilslutningsledm'ngeme 34-36 til plus-udgangen 37, til stelforbin-delses-udgangen 38 og til signal-udgangen 39, og disse HF-filtermidlers elektriske afledninger 43-45 er til afledning af opstående HF-strømme tilsluttet til det elektrisk ledende mikrofonhus 31, u For at afskærme kredsløbet 53 i høreapparatet fra støj påvirkninger, som kan op træde i en spændingskildes 50 elektriske tilslutningsledninger 51, 52, findes der ifølge det på fig. 3 viste udførelseseksempel en placering af HF-filtermidler 54, 55 i tilslutningsledningerne 51, 52 således, at disse filtermidlers 54, 55 elektriske afledninger 56, 57 har dannet kontakt med stelforbindelsen 23, som danner et potential.As the further exemplary examples show, the protective device according to the invention may also be attributed to individual components of the hearing aid. As shown in FIG. 2, there is a microphone 30 for the hearing aid, which is distinguished by an electrically conductive housing 31, a signal receiving 32 and an impedance converter 33, which preferably (o includes an amplifier. To increase the EMC strength of this microphone, filter means 40-42 in connection links 34-36 to the plus output 37, to the ground connection output 38 and to the signal output 39, and the electrical leads 43-45 of these HF filter means are connected to the output of rising HF currents to the electrically conductive microphone housing 31, u To shield the circuit 53 of the hearing aid from noise impacts which may occur in a voltage source 50 electrical connection lines 51, 52, according to the embodiment shown in Figure 3, a location of HF filter means 54 is provided. , 55 in the connection lines 51, 52 such that the electrical leads 56, 57 of these filter means 54, 55 have contacted the ground connection 23, which forms a potential.

» Som fig. 4 viser, er der ligeledes anbragt HF-filtermidler 65-67 i en lydstyrkeregu lators 63 elektriske forbindelsesledninger 60-62 med høreapparatets kredsløb 64, hvorved deres elektriske afledninger 68-70 igen er tilsluttet til stelforbindelsen 23, som danner et potential.»As FIG. 4 shows, HF filter means 65-67 are also arranged in the electrical connection lines 60-62 of a loudspeaker controller 63 with the hearing aid circuit 64, whereby their electrical leads 68-70 are again connected to the ground connection 23, which creates a potential.

Ved udførelseseksemplet ifølge fig. 5 drejer det sig om en lydgiver 71 med elek-m tri sk ledende hus 72 og med signalindgangs 73, 74. For at forbedre denne lydomformers EMC-styrke findes der HF-filtermidler 75, 76 i signalindgangsledningeme, hvorved deres elektriske afledninger 77, 78 til HF-strømmene igen kan tilsluttes til det elektrisk ledende lydgi verhus 72.In the embodiment of FIG. 5, it is a sound generator 71 with electrically conductive housing 72 and with signal input 73, 74. To improve the EMC strength of this sound converter, HF filter means 75, 76 are provided in the signal input lines, whereby their electrical leads 77, 78 to the HF currents can again be connected to the electrically conductive audio housing 72.

Fig. 6 viser en beskyttelsesanordning ifølge opfindelsen mod højfrekvente elektrode magnetiske bølger til en yderligere komponent i et høreapparat, nemlig til et elektrisk tilslutningsmiddel 5, som fx. en programmeringsbøsning eller en audiø-indgang. Herved er der anbragt HF-filtermidler 86-89 i de elektriske forbindelser 81-84 mellem tilslut-ningsmidlet 5 og et høreapparat-kredsløb 85, og deres elektriske afledninger 90-93 til HF-strømmene er tilsluttet til høreapparatets stelforbindelse 23, som danner et potential.FIG. 6 shows a protective device according to the invention against high frequency electrode magnetic waves for a further component of a hearing aid, namely for an electrical connection means 5, such as e.g. a programming socket or an audio input. Hereby, HF filter means 86-89 are arranged in the electrical connections 81-84 between the connecting means 5 and a hearing aid circuit 85, and their electrical leads 90-93 to the HF currents are connected to the hearing aid 23 of the hearing aid forming a potential.

35 Fig, 7, 8 viser ud forel seseksempler på udformningen af de anvendelige HF-filter midler. Ifølge dette kan et sådant HF-filtermiddei være konstrueret som passivt filter 95 af første orden eller som passivt filter 96 af anden eller højere orden.Figs. 7, 8 show examples of the design of the useful HF filter means. According to this, such HF filter medium may be constructed as first order passive filter 95 or as second or higher order passive filter 96.

Claims

An electric hearing aid with a housing (1) in which is provided an amplifier circuit (2) comprising at least one microphone (3) and switching and / or connecting means (4, s 5) and a voltage source (6), whereby the amplifier circuit further includes at least <sound emitter (7), and there is provided a protective device which is designed against high frequency waves, characterized in that HF filter means (13-17) are arranged in the hearing aid components (3-7 ) which are sensitive to high frequency, magnetic waves, increase / or in noise sensitive wiring (8-12) in the circuit of the hearing aid, and μ to prevent the introduction of HF currents into the signal processing circuitry from the HF filter means (13-17 ) there are electrical leads (18-22) to these HF currents for an earth connection (23) which generate a potential.

Hearing aid according to claim 1, characterized in that at least one HF filter means (13) is arranged in the conduit connection (8) between the microphone (3) and a preamplifier (24) 35 directly on the microphone signal output, or immediately in front of the preamplifier signal input,

Hearing aid according to claim 1 or 2, characterized in that an HF filter means (14) is arranged in the conduit connection (9) between the preamplifier (24) and the signal filter (25).

Hearing aid according to one or more of claims 1-3, characterized in that an HF spring means (15) is provided in the conduit connection (10) between the signal filter (25) and a coupling means (4) for amplification setting, which for example. amplifier or sound power regulator,

Hearing aid according to one or more of claims 1 to 4, characterized in that an HF release means (16) is arranged in the conduit connection (11) between the coupling means (4) and a sound transducer (7).

Hearing aid according to claim 5, characterized in that, by an external hearing aid pocket hearing aid, the HF filter means belongs to the output of the amplifier circuit of the hearing aid, and that on a head portable hearing aid with active sound sensor, the HF filter means is present at the sound input of the sound sensor. Hearing aid according to one or more of claims 1-6, characterized in that an MF filter means (17) is arranged in the line connection (12) between voltage source or battery (6) and the amplifier circuit (2).

Hearing aid according to one or more of claims 1-7, characterized in that a metal! Iced or metallic housing (1) or such a housing portion of the hearing aid is the ground connection m (23) which forms a potential.

Hearing aid according to claim 8, characterized in that the bus (1), which consists of plastic, has an electrically conductive coating, a metal foil coating or liner or the like. DK 176533 B1 -δ- ΙΟ. Hearing aid according to one or tens of claims i - 9, characterized in that a support for the amplifier circuit (2) has an extra ground connection position in the circuit board.

Hearing aid according to claim 1, characterized by a microphone (30) with an electrically conductive housing (31), a signal reception (32) and an impedance converter (33), preferably comprising an amplifier, whereby HF is provided. filter means (40-42) in the connection wires (34-36) for the plus, ground connection and signal output (37-39), and their electrical wires (43-45) for the HF currents are connected to the microphone housing ( 31)

Hearing aid according to claim 1, characterized in that, after the voltage source (50), HF filter means (54, 55) are arranged in electrical connection lines (51, 52) for the hearing aid circuit (53) to be supplied, and their electrical leads (56, 57) to the HF currents are connected to the ground connection (23), which forms a potential,

Hearing aid according to claim 1, characterized in that HF filter means (65-67) are arranged in the electrical connection wires (60-62) of a volume regulator (63) with the hearing aid circuit (64) and their electrical leads (68-70). ) is connected to the ground link (23) which forms a potential. Hearing aid according to claim 1, characterized by a sound transducer (71) having an electrically conductive housing (72) and having signal inputs (73, 74), whereby HF filter means (75, 76) are arranged in the signal input conductors and their electrical leads (77, 78) to the HF currents are connected to the audio housing (72).

Hearing aid according to claim 1, characterized by a connecting means (5) formed by a sewing programming socket, audio input or the like and in whose electrical connections (81-84) to the hearing aid circuit (85) arranged HF filter means (86-89) and their electrical leads (90-93) d1 The HF currents are connected to the ground connection (23) which forms a potential, a 16. Hearing aid according to one or more of claims 1 to 15, characterized by that a passive filter of first order nail HF filter means (95) exists,

Hearing aid according to one or more of claims 1 to 15, characterized in that a second or higher order passive filter HF filter means (96) exists.