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EP0485357B1 - Prothèse auditive avec circuit de filtrage - Google Patents

Prothèse auditive avec circuit de filtrage Download PDF

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Publication number
EP0485357B1
EP0485357B1 EP91890266A EP91890266A EP0485357B1 EP 0485357 B1 EP0485357 B1 EP 0485357B1 EP 91890266 A EP91890266 A EP 91890266A EP 91890266 A EP91890266 A EP 91890266A EP 0485357 B1 EP0485357 B1 EP 0485357B1
Authority
EP
European Patent Office
Prior art keywords
filter
amplifier
hearing aid
transistor
frequency
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.)
Expired - Lifetime
Application number
EP91890266A
Other languages
German (de)
English (en)
Other versions
EP0485357A3 (en
EP0485357A2 (fr
Inventor
Zlatan Dipl.-Ing. Dr. Ribic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Viennatone AG
Original Assignee
Viennatone AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Viennatone AG filed Critical Viennatone AG
Publication of EP0485357A2 publication Critical patent/EP0485357A2/fr
Publication of EP0485357A3 publication Critical patent/EP0485357A3/de
Application granted granted Critical
Publication of EP0485357B1 publication Critical patent/EP0485357B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing

Definitions

  • the invention relates to a hearing aid with a microphone, at least one amplifier acted upon by its signal, which interacts to influence the frequency response with a higher-order filter, which is designed as a multiple filter, and a loudspeaker, which converts the amplified signals into sound waves, wherein the filter has a biquadratic structure with at least two integrators and an inverting amplifier.
  • a hearing aid of the type mentioned was known, in which, however, the biquadratic filter is constructed with an operational amplifier, or else the filter is contained in an integrated circuit.
  • Two branches connected in parallel are provided, in each of which an amplifier with a biquadratic filter is connected in series.
  • a high-pass filter is arranged in one of the branches and a low-pass filter in the other branch, both of which have a biquadratic structure.
  • the aim of the invention is to propose a hearing aid of the type mentioned at the outset in which an optimal adaptation of the frequency response is possible and which is simple to manufacture.
  • the biquadratic filter is arranged in a feedback loop of the amplifier and the active elements of the integrators and the inverting amplifier are formed by individual transistors.
  • individual stages of the filter are connected to one another by one or more feedback lines.
  • This measure allows a particularly good adaptation of the hearing aid frequency response to be achieved by installing adjustable components in the feedback lines.
  • the feedback loop of the amplifier is guided via an adjustable potentiometer for setting the filter increase or decrease and a potentiometer for setting the center frequency of the filter is arranged in the filter circuit.
  • FIG. 1 shows a block diagram of a hearing aid according to the invention, the microphone 1 converting the sound signal into an electrical signal, which is amplified in the preamplifier 2, then an intermediate amplifier 6 for influencing the frequency response, and a filter in its feedback loop 3 is arranged, passes through and is influenced frequency-selectively.
  • This intermediate amplifier 6 is followed by a power amplifier 4 which raises the signal to a desired level, the power amplifier 4 being followed by a loudspeaker 5 which converts the electrical signal back into an acoustic signal.
  • FIG. 2 shows the basic structure of such a filter 3.
  • This has a biquadratic structure, the transistors T2 and T3 forming two integrators in connection with the resistor R F1 and the capacitor C1, or the resistor R F2 and the capacitor C2 .
  • the phase inversion stage required for a biquadratic structure is formed by the transistor T1 and the associated resistors R I2 , R x , R A1 .
  • the load resistances of the transistors T1 to T3 are denoted by R A1 , R A2 and R A3 .
  • the collector of the transistor T3 is fed back via the resistor R X to the base of the transistor T1.
  • the base of the transistor T1 is used as an input, the collector outputs of all three transistors T1, T2 and T3 being available as outputs.
  • the collector of transistor T1 gives a high-pass output (FIG. 4a)
  • the collector of transistor T2 gives a band-pass output (FIG. 4b)
  • the collector of transistor T3 gives a low-pass output (FIG. 4c).
  • the center frequency of this filter is determined by the resistors R F1 and / or R F2 and the capacitors C1 and C2.
  • the filter 3 shown in FIG. 2 is a simplified Kerwin-Huelsman-Newcomb structure, which belongs to the group of biquadratic filters. By arranging a further feedback from the collector of transistor T2 to the emitter of transistor T1 by means of an emitter resistor, it is also possible to change the quality factor of the filter and to upgrade the filter to a full Kerwin-Huelsman-Newcomb structure.
  • all three basic connections can be connected to a common input using three high-resistance resistors.
  • the collectors of transistors T1 or T3 can be used as a bandpass output. But then it is no high pass exit available.
  • Such a circuit then corresponds to a Tow-Thomas structure, which is also one of the biquadratic filters.
  • the base of transistor T3 can be used alone as an input.
  • the transistor T4 with its load resistor R5 serves as an amplifier, a base-collector negative feedback via the resistors R2 and R3 being provided in a known manner for stabilizing the operating point and adjusting the gain.
  • this amplifier 6 is connected to the filter 3, which lies in the feedback loop of the amplifier 6.
  • the transistors T1 to T3 form a biquadratic structure, the transistor T3 with the resistor R I2 and the capacitor C1 and the transistor T2 with the capacitor C2 and the resistor R I1 forming the two integrators.
  • the phase inversion stage is formed by transistor T1 with resistors R F and R7.
  • the gain of this amplifier T1 arranged in the filter 3 can be changed by the resistor R F connected as a potentiometer, the change in the gain also resulting in a shift in the resonance frequency of the entire filter 3.
  • the load resistors of filter 3 are formed by resistors R8, R9 and R10.
  • the collector of transistor T3 represents the bandpass output of filter 3, a signal in phase opposition to it being able to be tapped at the collector of transistor T1.
  • the amplitude and the phase of the signal fed back to the amplifier 6 can be influenced by the potentiometer R A.
  • the feedback of the transistor T4 can be selected such that, depending on the setting of the potentiometer R A , a positive increase (positive feedback) selective increase or a negative feedback (negative feedback) a reduction of the signal passing through the filter 3 is achieved.
  • the Quality of the filter 3 is essentially determined by the dimensioning of the resistors R2, R3 and R4.
  • FIG. 5 shows, for example, the function of the circuit according to FIG. 4, wherein the center frequencies of the increases or decreases can be selected by adjusting the resistance R F.
  • FIG. 5 shows only a few frequency responses which are picked out arbitrarily, the course of the curves above and below the center line indicating the extent to which the increase or decrease can be varied at the individual frequencies.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)

Claims (3)

  1. Prothèse auditive pourvue d'un microphone (1), d'au moins un amplificateur (6) sollicité par son signal et agissant en combinaison avec un filtre (3), d'un degré supérieur et formé comme un filtre composé, de manière à influencer la réponse fréquentielle et d'un haut-parleur (5), lequel convertit les signaux amplifiés en ondes sonores, le filtre (3) présentant une structure biquadratique avec au moins deux intégrateurs (T3, R₁₂, C1, T2, R₁₁, C2) et un amplificateur invertissant (T1),
    caractérisée en ce que
    le filtre biquadratique (3) est placé dans une boucle de rétroaction de l'amplificateur (6) et en ce que les éléments actifs des composants des intégrateurs et de l'amplificateur invertissant du filtre (3) sont formés par des transistors indépendants (T1, T2, T3).
  2. Prothèse auditive selon la revendication 1 caractérisée en ce que les niveaux du filtre (3) sont reliés les uns aux autres au moyen d'un ou plusieurs circuits de rétroaction.
  3. Prothèse auditive selon la revendication 1 ou 2 caractérisée en ce que la boucle de rétroaction de l'amplificateur (6) est guidée au moyen d'un potentiomètre (RA) réglable de manière à provoquer l'amplification préférentielle ou l'atténuation du filtre et en ce qu'un potentiomètre réglable (RF) est disposé dans le circuit filtrant (3) pour le réglage de la fréquence centrale du filtre (3).
EP91890266A 1990-11-07 1991-11-06 Prothèse auditive avec circuit de filtrage Expired - Lifetime EP0485357B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2237/90 1990-11-07
AT0223790A AT407103B (de) 1990-11-07 1990-11-07 Hörgerät mit filterschaltung

Publications (3)

Publication Number Publication Date
EP0485357A2 EP0485357A2 (fr) 1992-05-13
EP0485357A3 EP0485357A3 (en) 1993-01-13
EP0485357B1 true EP0485357B1 (fr) 1996-03-06

Family

ID=3530575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91890266A Expired - Lifetime EP0485357B1 (fr) 1990-11-07 1991-11-06 Prothèse auditive avec circuit de filtrage

Country Status (6)

Country Link
US (1) US5263089A (fr)
EP (1) EP0485357B1 (fr)
AT (1) AT407103B (fr)
CA (1) CA2054136C (fr)
DE (1) DE59107507D1 (fr)
DK (1) DK0485357T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406633A (en) * 1992-11-03 1995-04-11 Auditory System Technologies, Inc. Hearing aid with permanently adjusted frequency response
US5909497A (en) * 1996-10-10 1999-06-01 Alexandrescu; Eugene Programmable hearing aid instrument and programming method thereof
US7010136B1 (en) * 1999-02-17 2006-03-07 Micro Ear Technology, Inc. Resonant response matching circuit for hearing aid
WO2001070110A1 (fr) * 2000-03-24 2001-09-27 Franz Burkhard K H G Procede et dispositif de traitement du tinnitus
US8027799B2 (en) * 2007-11-28 2011-09-27 Honeywell International Inc. Digital potentiometer system
EP4046396A4 (fr) * 2019-10-16 2024-01-03 Nuance Hearing Ltd. Dispositifs de formation de faisceau destinés à l'aide auditive
DE102022111300A1 (de) 2022-05-06 2023-11-09 Elevear GmbH Vorrichtung zur Reduzierung des Rauschens bei der Wiedergabe eines Audiosignals mit einem Kopfhörer oder Hörgerät und entsprechendes Verfahren

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192511B (en) * 1986-07-11 1990-02-21 Roger Frederick Laurence Hearing aid

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1294456C2 (de) * 1966-08-01 1976-02-05 Siemens AG, 1000 Berlin und 8000 München Miller-integrator
US3619659A (en) * 1969-12-02 1971-11-09 Honeywell Inf Systems Integrator amplifier circuit with voltage regulation and temperature compensation
DE2658301C2 (de) * 1976-12-22 1978-12-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Hörgerät
DE2813946C2 (de) * 1978-03-31 1980-01-31 Siemens Ag, 1000 Berlin Und 8000 Muenchen Filterschaltung mit einer biquadratischen Übertragungsfunktion
US4453132A (en) * 1982-04-21 1984-06-05 Motorola, Inc. Active filter
JPS60114016A (ja) * 1983-11-25 1985-06-20 Nippon Gakki Seizo Kk フイルタ回路
US4792977A (en) * 1986-03-12 1988-12-20 Beltone Electronics Corporation Hearing aid circuit
US5075582A (en) * 1989-03-30 1991-12-24 Siemens Aktiengesellschaft Integratable bandpass filter circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192511B (en) * 1986-07-11 1990-02-21 Roger Frederick Laurence Hearing aid

Also Published As

Publication number Publication date
AT407103B (de) 2000-12-27
US5263089A (en) 1993-11-16
DE59107507D1 (de) 1996-04-11
ATA223790A (de) 1994-04-15
CA2054136C (fr) 1995-04-25
EP0485357A3 (en) 1993-01-13
DK0485357T3 (da) 1996-05-20
CA2054136A1 (fr) 1992-05-08
EP0485357A2 (fr) 1992-05-13

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