EP0485357A2 - Prothèse auditive avec circuit de filtrage - Google Patents

Prothèse auditive avec circuit de filtrage Download PDF

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Publication number
EP0485357A2
EP0485357A2 EP91890266A EP91890266A EP0485357A2 EP 0485357 A2 EP0485357 A2 EP 0485357A2 EP 91890266 A EP91890266 A EP 91890266A EP 91890266 A EP91890266 A EP 91890266A EP 0485357 A2 EP0485357 A2 EP 0485357A2
Authority
EP
European Patent Office
Prior art keywords
filter
amplifier
hearing aid
feedback loop
frequency response
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
Application number
EP91890266A
Other languages
German (de)
English (en)
Other versions
EP0485357B1 (fr
EP0485357A3 (en
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
Viennatone GmbH
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Filing date
Publication date
Application filed by Viennatone AG, Viennatone GmbH 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
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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.
  • bandpass filters which influence the frequency response more or less.
  • bandpass filters which are formed from a high and a low pass filter, a case is known where a "graphic equalizer" is used, a parallel connection of several bandpass filters with fixed frequency bands, but independently controllable amplitudes.
  • filters of a higher order which enable a correspondingly good adaptation of the frequency response, require a relatively high expenditure on components.
  • the aim of the invention is to propose a hearing aid of the type mentioned at the beginning, in which an optimal adaptation of the frequency response is possible.
  • the filter has a biquadratic structure and has at least two integrators and an inverting amplifier, in which components the active elements are formed by discrete components, in particular individual transistors.
  • This measure has the advantage that two or three parameters can be controlled in a simple manner.
  • the filter is arranged in the feedback loop of the amplifier.
  • the 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 a 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, wherein the microphone 1 converts the sound signal into an electrical signal, which is amplified in the preamplifier 2, then passes through the filter 3 to influence the frequency response and finally after it in the power amplifier 4 the required output level has been amplified, is converted back into an acoustic sound signal by a loudspeaker 5.
  • the filter is arranged in a conventional manner between two amplifier stages.
  • FIG. 2 shows a block diagram of a hearing device according to the invention, the filter being arranged in the feedback loop of an amplifier.
  • the microphone 1 converts the sound signal into an electrical signal, which is amplified in the preamplifier 2. Then it passes through the intermediate amplifier 6, in the feedback loop of which the filter 3 is arranged, as a result of which the signal is influenced in a frequency-selective manner. Then the signal in the power amplifier 4 is amplified to the required output level and finally converted again by the loudspeaker 5 into an acoustic sound signal.
  • Fig. 3 shows the basic structure of such a filter 3.
  • This has a biquadratic structure, the transistors T2 and T3 in conjunction with the resistor R F1 and the capacitor C1, or the resistor R F2 and the capacitor C2 form two integrators .
  • 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 .
  • transistor T3 is fed back to the base of transistor T1 via resistor R x .
  • the base of 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 same filter can thus be provided for different applications.
  • 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. 3 is a simplified Kerwin-Huelsman-Newcomb structure which is used for Group of biquadratic filters counts.
  • 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 there is no high-pass exit.
  • 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 operating point stabilization and gain adjustment.
  • 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 as well as the transistor T2 with the capacitor top C2 and the resistor R I1 forming the two integrators.
  • the phase inversion stage is formed by the transistor T1 with the 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 shifting the resonance frequency of the entire filter 3 results.
  • the working resistances of the filter 3 are formed by the resistors R8, R9 and R10.
  • the collector of the transistor T3 represents the bandpass output of the filter 3, a signal in phase opposition to it being able to be tapped at the collector of the 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. 6 shows, for example, the function of the circuit according to FIG. 5, the center frequencies of the increases or decreases being able to be selected by adjusting the resistance R F.
  • FIG. 6 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)
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
AT0223790A AT407103B (de) 1990-11-07 1990-11-07 Hörgerät mit filterschaltung
AT2237/90 1990-11-07

Publications (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994010819A1 (fr) * 1992-11-03 1994-05-11 Auditory System Technologies, Inc. Prothese auditive a courbe de frequence ajustee en permanence
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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20230336926A1 (en) * 2019-10-16 2023-10-19 Nuance Hearing Ltd. Beamforming devices for hearing assistance

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2658301B1 (de) * 1976-12-22 1978-04-20 Siemens Ag Hoergeraet
DE2813946B1 (de) * 1978-03-31 1979-06-07 Siemens Ag Filterschaltung mit einer biquadratischen UEbertragungsfunktion
JPS60114016A (ja) * 1983-11-25 1985-06-20 Nippon Gakki Seizo Kk フイルタ回路
GB2192511B (en) * 1986-07-11 1990-02-21 Roger Frederick Laurence Hearing aid
EP0390076A1 (fr) * 1989-03-30 1990-10-03 Siemens Aktiengesellschaft Filtre passe-bande pouvant être constitué sous forme de circuit intégré

Family Cites Families (4)

* 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
US4453132A (en) * 1982-04-21 1984-06-05 Motorola, Inc. Active filter
US4792977A (en) * 1986-03-12 1988-12-20 Beltone Electronics Corporation Hearing aid circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2658301B1 (de) * 1976-12-22 1978-04-20 Siemens Ag Hoergeraet
DE2813946B1 (de) * 1978-03-31 1979-06-07 Siemens Ag Filterschaltung mit einer biquadratischen UEbertragungsfunktion
JPS60114016A (ja) * 1983-11-25 1985-06-20 Nippon Gakki Seizo Kk フイルタ回路
GB2192511B (en) * 1986-07-11 1990-02-21 Roger Frederick Laurence Hearing aid
EP0390076A1 (fr) * 1989-03-30 1990-10-03 Siemens Aktiengesellschaft Filtre passe-bande pouvant être constitué sous forme de circuit intégré

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 270 (E-353)26. Oktober 1985 & JP-A-60 114 016 ( NIPPON GAKKI ) 20. Juni 1985 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994010819A1 (fr) * 1992-11-03 1994-05-11 Auditory System Technologies, Inc. Prothese auditive a courbe de frequence ajustee en permanence
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

Also Published As

Publication number Publication date
EP0485357B1 (fr) 1996-03-06
ATA223790A (de) 1994-04-15
US5263089A (en) 1993-11-16
AT407103B (de) 2000-12-27
DE59107507D1 (de) 1996-04-11
DK0485357T3 (da) 1996-05-20
CA2054136C (fr) 1995-04-25
EP0485357A3 (en) 1993-01-13
CA2054136A1 (fr) 1992-05-08

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