WO1996037086A1 - Dispositif anti-interference hf - Google Patents

Dispositif anti-interference hf

Info

Publication number
WO1996037086A1
WO1996037086A1 PCT/EP1996/002114 EP9602114W WO9637086A1 WO 1996037086 A1 WO1996037086 A1 WO 1996037086A1 EP 9602114 W EP9602114 W EP 9602114W WO 9637086 A1 WO9637086 A1 WO 9637086A1
Authority
WO
WIPO (PCT)
Prior art keywords
microphone
capacitors
hearing aid
signal output
aid according
Prior art date
Application number
PCT/EP1996/002114
Other languages
English (en)
Inventor
Matthias Latzel
Original Assignee
Resound-Viennatone Hörtechnologie 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 Resound-Viennatone Hörtechnologie Ag filed Critical Resound-Viennatone Hörtechnologie Ag
Priority to AU58190/96A priority Critical patent/AU5819096A/en
Publication of WO1996037086A1 publication Critical patent/WO1996037086A1/fr

Links

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 having an Electrete microphone with its output connected via an HF-filter device to an amplifier, said HF-filter device being operable particularly in a frequency range between 900 - 1600 MHz.
  • Hearing aids of this kind are in general merely low-frequency amplifiers. In those hearing aids interference can be observed due to high-frequency (HF) cross-talk.
  • HF high-frequency
  • the capacitor mentioned must have a capacity of at least about 68 pF in order to keep the interference within the required limits.
  • this capacitor is available in the 0805-size only, this method is not recommendable at all .
  • SMD surface-mounted devices
  • size 0805 is as large as 2x1.27x0.63 mm 3 , which does not permit direct attachment to the micro ⁇ phones and, as a matter of fact, makes it nearly impossible.
  • Electrete microphones are commonly used which have a field effect transistor (FET) built-in as an impedance transformer. It seems that disturbing cross-talks are generated already in this FET which demodulates the HF-energy entering the microphone via the stranded connecting wires. This leads to the fact that the anti-interference capacitor on the circuit-board carrying the rest of the parts of the hearing aid is no longer ef ⁇ fective and the desired interference suppression does not work.
  • FET field effect transistor
  • a hearing aid having an Electrete microphone connected with its output via an HF-filter device to an amplifier which HF-filter device being operable in particular in a frequency range be ⁇ tween about 900 and 1600 MHz.
  • the HF-filter device which consists of two capacitors which are arranged between the signal output of the microphone, the ground connection and the power supply connection.
  • the invention suggests to replace the single capacitor used so far by two capacitors, having an accordingly smaller capacity and, therefore, being also smaller in size. Since these capacitors are connected very closely to the microphone terminals, no resonant circuit can develop as it would result from longer connecting wires.
  • the invention can be embodied by either connecting the capacitors between the signal output of the microphone and the ground connection or between signal output of the microphone and the power supply connection, respectively, or by connecting one side of each of the capacitors to the ground connection, while the one electrode of one capacitor is connected to the signal output of the microphone and the other electrode of the other capacitor is connected to the power supply connection.
  • a particularly space-saving arrangement is offered with the capacitors being directly connected to the microphone terminals lying flat on the microphone and being connected to their soldering pads by wires with a maximum length of 5 mm.
  • a particularly advantageous arrangement of the anti-interference device is reached by the integration of the two capacitors into a ceramic substrate inside the housing of the microphone.
  • Fig. 1 shows a block diagram of one embodiment of a hearing aid according to the invention
  • Figs. 2 and 3 show a side view and a top view of a microphone fitted with capacitors
  • Figs. 4 and 5 show diagrams regarding the interference sensitivity without and with capacitors proposed by the invention.
  • Fig. 6 shows a block diagram of another embodiment of a hearing aid according to the invention.
  • a hearing aid according to the invention comprises an Electrete microphone 1 which is connected through conductor 5 to a ground connection 15 as well as the negative side of a battery 10. There is also a conductor 6 connected via a switch 11 to the positive side of the battery 10. Both the conductors 5 and 6 are also connected to an amplifier 8 whose input is connected to the signal out ⁇ put 7 of microphone 1.
  • two capacitors 2, 3 are connected for interference sup ⁇ pression, whose second electrodes are connected to ground 15 through conductor 5 on the one hand and to conductor 6 at microphone 1, respectively.
  • the output of amplifier 8 feeds a receiver (loudspeaker) 9.
  • two capacitors 2, 3 are connected to the ground connection 15 through conductor 5 on the one hand, while the other electrode of capacitor 2 is connected to conductor 6 at microphone 1 and the second electrode of capacitor 3 is connected to the signal output 7 of the microphone.
  • microphone 1 has soldering pads 4 one of which is a ground connection 15 and the other one is connected via conductor 6 to the positive side of battery 10 and the third one is the signal output 7 of the microphone.
  • the two capacitors 2 and 3 in form of SMD-chip capacitors are arranged directly with their electrodes 2.1, 2.2, 3.1 and 3.2 at the soldering pads 4 of the microphone and soldered thereto.
  • Fig. 4 shows the interference sensitivity of a normal behind-the-ear hearing aid of the typ 145S without additional anti-interference devices. It shows that the permissible limit IRLL max + gain (input-referred interference level + gain), which is also depending on the gain of the hearing aid, is clearly exceeded with respect to the frequency range in question (840 - 900 MHz).
  • Fig. 5 shows in comparison the interference sensitivity of the same hearing aid with an HF-filter device according to the invention.
  • the left-side axis show the loudspeaker sound pressure La related to the threshold of audibility of 20 Pa.
  • the right side axis of Fig. 5 shows the input-referred interference level IRIL related to the threshold of audibility of 20 Pa.
  • FIG. 4 A comparison of the diagrams Fig. 4 and Fig. 5 shows that by incorporation of the capacitors 2 and 3 according to the invention into the same hearing aid the interference sensitivity for the same field strength (3V/m) has clearly dropped and the permissible limit IRIL + gain is no longer exceeded.

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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'invention concerne une prothèse auditive comportant un microphone à électret (1) comprenant un amplificateur (8) raccordé à la sortie du microphone par un dispositif de filtre HF présentant en particulier une gamme de fréquences comprise entre 900 et 1600 MHz. Afin de supprimer de façon efficace les interférences dans une prothèse auditive, on peut utiliser un filtre HF comprenant deux condensateurs (2, 3) disposés entre la sortie de signaux (7) du microphone, le raccordement à la terre (15) et le raccordement d'alimentation (6).
PCT/EP1996/002114 1995-05-18 1996-05-15 Dispositif anti-interference hf WO1996037086A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58190/96A AU5819096A (en) 1995-05-18 1996-05-15 Hf-anti-interference device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT84695A AT401595B (de) 1995-05-18 1995-05-18 Hörgerät
ATA846/95 1995-05-18

Publications (1)

Publication Number Publication Date
WO1996037086A1 true WO1996037086A1 (fr) 1996-11-21

Family

ID=3501125

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/002114 WO1996037086A1 (fr) 1995-05-18 1996-05-15 Dispositif anti-interference hf

Country Status (3)

Country Link
AT (1) AT401595B (fr)
AU (1) AU5819096A (fr)
WO (1) WO1996037086A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547195A1 (de) * 1995-12-16 1997-06-19 Hoermann Audifon Gmbh Miniaturisiertes, im oder am Ohr zu tragendes Hörgerät
WO2000010363A1 (fr) * 1998-08-13 2000-02-24 Siemens Audiologische Technik Gmbh Prothese auditive pourvue d'un dispositif permettant de supprimer les signaux parasites electromagnetiques, et procede permettant de supprimer lesdits signaux dans les protheses auditives
US6104821A (en) * 1996-10-02 2000-08-15 Siemens Audiologische Technik Gmbh Electrical hearing aid device with high frequency electromagnetic radiation protection
US6773600B2 (en) 2002-06-14 2004-08-10 Cantocor, Inc. Use of a clathrate modifier, to promote passage of proteins during nanofiltration
US9344817B2 (en) 2000-01-20 2016-05-17 Starkey Laboratories, Inc. Hearing aid systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105147A (en) * 1981-09-03 1983-03-16 Bosch Gmbh Robert Hearing aid
DE3821592A1 (de) * 1987-10-05 1989-04-20 Roederstein Kondensatoren Elektrisches bauteil fuer die oberflaechenmontage-technik sowie verfahren zu seiner herstellung
DE3734946A1 (de) * 1987-10-15 1989-05-03 Siemens Ag Hoergeraet mit moeglichkeit zum telefonieren
EP0614202A2 (fr) * 1993-03-05 1994-09-07 Matsushita Electric Industrial Co., Ltd. Condensateur à trois bornes et assemblage
DE4343703C1 (de) * 1993-12-21 1995-01-05 Siemens Audiologische Technik Am Kopf tragbares Hörgerät

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105147A (en) * 1981-09-03 1983-03-16 Bosch Gmbh Robert Hearing aid
DE3821592A1 (de) * 1987-10-05 1989-04-20 Roederstein Kondensatoren Elektrisches bauteil fuer die oberflaechenmontage-technik sowie verfahren zu seiner herstellung
DE3734946A1 (de) * 1987-10-15 1989-05-03 Siemens Ag Hoergeraet mit moeglichkeit zum telefonieren
EP0614202A2 (fr) * 1993-03-05 1994-09-07 Matsushita Electric Industrial Co., Ltd. Condensateur à trois bornes et assemblage
DE4343703C1 (de) * 1993-12-21 1995-01-05 Siemens Audiologische Technik Am Kopf tragbares Hörgerät

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547195A1 (de) * 1995-12-16 1997-06-19 Hoermann Audifon Gmbh Miniaturisiertes, im oder am Ohr zu tragendes Hörgerät
US6104821A (en) * 1996-10-02 2000-08-15 Siemens Audiologische Technik Gmbh Electrical hearing aid device with high frequency electromagnetic radiation protection
WO2000010363A1 (fr) * 1998-08-13 2000-02-24 Siemens Audiologische Technik Gmbh Prothese auditive pourvue d'un dispositif permettant de supprimer les signaux parasites electromagnetiques, et procede permettant de supprimer lesdits signaux dans les protheses auditives
US6587568B1 (en) 1998-08-13 2003-07-01 Siemens Audiologische Technik Gmbh Hearing aid and method for operating a hearing aid to suppress electromagnetic disturbance signals
US9344817B2 (en) 2000-01-20 2016-05-17 Starkey Laboratories, Inc. Hearing aid systems
US9357317B2 (en) 2000-01-20 2016-05-31 Starkey Laboratories, Inc. Hearing aid systems
US6773600B2 (en) 2002-06-14 2004-08-10 Cantocor, Inc. Use of a clathrate modifier, to promote passage of proteins during nanofiltration

Also Published As

Publication number Publication date
ATA84695A (de) 1996-02-15
AU5819096A (en) 1996-11-29
AT401595B (de) 1996-10-25

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