WO2005020549A1 - Digital communication device - Google Patents

Digital communication device Download PDF

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Publication number
WO2005020549A1
WO2005020549A1 PCT/DK2004/000444 DK2004000444W WO2005020549A1 WO 2005020549 A1 WO2005020549 A1 WO 2005020549A1 DK 2004000444 W DK2004000444 W DK 2004000444W WO 2005020549 A1 WO2005020549 A1 WO 2005020549A1
Authority
WO
WIPO (PCT)
Prior art keywords
receiver
signal
communication device
connection point
hearing aid
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.)
Ceased
Application number
PCT/DK2004/000444
Other languages
French (fr)
Inventor
Ivan H. H. JØRGENSEN
Mohamad Essabar
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.)
Oticon AS
Original Assignee
Oticon AS
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 Oticon AS filed Critical Oticon AS
Priority to US10/569,412 priority Critical patent/US20060227988A1/en
Priority to EP04738941.6A priority patent/EP1661373B3/en
Priority to DK04738941.6T priority patent/DK1661373T6/en
Publication of WO2005020549A1 publication Critical patent/WO2005020549A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/55—Electric hearing aids using an external connection, either wireless or wired
    • H04R25/554—Electric hearing aids 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
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/05—Supports for telephone transmitters or receivers specially adapted for use on head, throat or breast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones

Definitions

  • the invention concerns a digital communication device like a hearing aid or a headset, hi such devices a receiver or loudspeaker unit is used, which produces an audio signal which is presented to the ear of the user.
  • a digital communication device like a hearing aid or a headset
  • a receiver or loudspeaker unit is used, which produces an audio signal which is presented to the ear of the user.
  • the signal served at the receiver is a modulated pulsed signal with high frequency shifting rate.
  • the loudspeaker coil and other electronic parts will function as a filter, such that the audio signal produced will have a reasonable quality
  • the high frequency shifting rate will also cause a considerable electromagnetic radiation noise to be produced from the feed lines and from the coil in the loudspeaker. This radiation may be picked up by other parts of the communication device, and especially if the communication device has a coil or antenna for wireless reception of signals this is a problem. This will cause the Noise to Signal Ratio (NSR) from the wireless reception to degrade.
  • NSR Noise to Signal Ratio
  • the radiation from the wires or feed lines can be reduced by use of coaxial cables.
  • the invention is targeted at reducing the radiation from the speaker case.
  • the proposed solution according to claim 1 attenuates the radiated fields present in a hearing aid or other communication device.
  • the solution targets the fields radiated from the speaker.
  • the speaker case in conventional hearing aid or other communication devices is not connected to any electrical potential in the system and therefore has a floating potential.
  • the speaker case is energised and radiates a considerable electrical field in its proximity. Connecting the speaker case to a well defined stable potential almost eliminates the radiated field.
  • the speaker case is connected to the negative pole of the power supply.
  • FIG. 1 Schematic representation of a hearing aid with the receiver.
  • Fig. 2 is a diagram showing the frequency spectrum of the noise signal radiated from the receiver casing.
  • a schematic view of a hearing aid according to an embodiment of the invention is shown in fig. 1.
  • the hearing aid comprises a microphone 10 and a wireless receiving antenna 8, both connected to a DSP unit 9.
  • the DSP unit comprises a sigma-delta modulator 7, and also the DSP unit is comiected to a battery 6 and a receiver 1.
  • the receiver 1 is driven by a sigma delta modulated signal, which is produced by the modulator 7, and when the receiver 1 demodulates this signal, it produces an audio signal.
  • Two wires 2,3 are required for the actual sigma delta modulated signal.
  • a third wire 4 is connected to a metal casing 5 of the receiver 1. This wire 4 is grounded, which means that it is connected to the ground or the zero potential. The ground in this case is zero potential. Usually, it is defined as the negative battery potential but it could also be any other stable voltage potential within the hearing aid.
  • the radiated noise from the receiver casing and the two wires 2,3 is the modulation noise of the sigma delta modulator 7.
  • the general measured spectrum is as depicted in Fig. 2.
  • the sigma delta modulator 7 is used in hearing aids because of its low noise in the audio band compared with ordinary quantisation of the audio signal.
  • the disadvantage is the higher noise in the high frequency range and as can be seen in fig. 2 this noise remains at a high level even at very high frequencies. This is generally not a problem for hearing aids where the audio band is of prime concern.
  • the hearing aid is equipped with means 8 for receiving wireless signals in the same frequency range as the noise signal, this noise is very disturbing, and it is necessary to apply special measures to dampen this noise.
  • the noise which is radiated is reduced considerably because the grounded case will act as a shield towards the electrical fields generated inside the case. Furthermore, any magnetic fields inside the case will induce currents that will run in the conducting case of the speaker. If the speaker case has a floating potential large voltages will be generated on the case surface. This is prevented when the casing is effectively shorted to ground by connecting the receiver case to the zero potential.
  • connections 2,3 between the receiver and the other parts of the hearing aid, and also the connection 4 between the case and ground potential could be made by conducting wire.
  • all 3 wires should be as short as possible as these wires also generate noise. Therefore, the resulting resistance should be in the order of a few milliohms, preferably below 5mOhms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Noise Elimination (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

The invention concerns a digital communication device like a hearing aid or a headset. The hearing aid or headset has a power supply, a signal processing device, means for receiving a wireless signal and a receiver or loudspeaker, which produces an audio signal based on a modulated pulsed signal with high frequency shifting rate produced by the signal processing device. Further the receiver has a first and a second connection point for receiving the pulsed modulated signal wherein the sound producing parts of the receiver are at least partially enclosed by a metal box, whereby a third connection point is provided which is in electrical contact with the metal of the metal box and whereby this third connection point is connected to the electric circuitry of the communication device at a point having a stable and well defined electrical potential. In this way the electro-and magnetic radiation from the metal parts of the receiver is reduced.

Description

TITLE Digital communication device.
AREA OF THE INVENTION
The invention concerns a digital communication device like a hearing aid or a headset, hi such devices a receiver or loudspeaker unit is used, which produces an audio signal which is presented to the ear of the user. In modern digital devices the signal served at the receiver is a modulated pulsed signal with high frequency shifting rate. When a signal of the above kind is served at a loudspeaker, the loudspeaker coil and other electronic parts will function as a filter, such that the audio signal produced will have a reasonable quality
BACKGROUND OF THE INVENTION
The high frequency shifting rate will also cause a considerable electromagnetic radiation noise to be produced from the feed lines and from the coil in the loudspeaker. This radiation may be picked up by other parts of the communication device, and especially if the communication device has a coil or antenna for wireless reception of signals this is a problem. This will cause the Noise to Signal Ratio (NSR) from the wireless reception to degrade. The radiation from the wires or feed lines can be reduced by use of coaxial cables. The invention is targeted at reducing the radiation from the speaker case.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a digital communication device with improved NSR from the wireless reception of signals. It is a further object of the invention to provide a hearing aid with a receiver which is served with a modulated pulsed signal and a wireless reception antenna where the NSR of the wireless reception is not seriously degraded by electro- and/or magnetic radiation from the signal served at the receiver.
The proposed solution according to claim 1 attenuates the radiated fields present in a hearing aid or other communication device. The solution targets the fields radiated from the speaker. The speaker case in conventional hearing aid or other communication devices is not connected to any electrical potential in the system and therefore has a floating potential. The speaker case is energised and radiates a considerable electrical field in its proximity. Connecting the speaker case to a well defined stable potential almost eliminates the radiated field.
Preferably the speaker case is connected to the negative pole of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 Schematic representation of a hearing aid with the receiver.
Fig. 2 is a diagram showing the frequency spectrum of the noise signal radiated from the receiver casing.
DESCRIPTION OF A PREFERRED EMBODIMENT
A schematic view of a hearing aid according to an embodiment of the invention is shown in fig. 1. The hearing aid comprises a microphone 10 and a wireless receiving antenna 8, both connected to a DSP unit 9. The DSP unit comprises a sigma-delta modulator 7, and also the DSP unit is comiected to a battery 6 and a receiver 1. The receiver 1 is driven by a sigma delta modulated signal, which is produced by the modulator 7, and when the receiver 1 demodulates this signal, it produces an audio signal. Two wires 2,3 are required for the actual sigma delta modulated signal. A third wire 4 is connected to a metal casing 5 of the receiver 1. This wire 4 is grounded, which means that it is connected to the ground or the zero potential. The ground in this case is zero potential. Usually, it is defined as the negative battery potential but it could also be any other stable voltage potential within the hearing aid.
The radiated noise from the receiver casing and the two wires 2,3 is the modulation noise of the sigma delta modulator 7. The general measured spectrum is as depicted in Fig. 2. The sigma delta modulator 7 is used in hearing aids because of its low noise in the audio band compared with ordinary quantisation of the audio signal. The disadvantage is the higher noise in the high frequency range and as can be seen in fig. 2 this noise remains at a high level even at very high frequencies. This is generally not a problem for hearing aids where the audio band is of prime concern. However when the hearing aid is equipped with means 8 for receiving wireless signals in the same frequency range as the noise signal, this noise is very disturbing, and it is necessary to apply special measures to dampen this noise. By connecting the receiver metal casing 5 with the zero potential in the hearing aid the noise which is radiated is reduced considerably because the grounded case will act as a shield towards the electrical fields generated inside the case. Furthermore, any magnetic fields inside the case will induce currents that will run in the conducting case of the speaker. If the speaker case has a floating potential large voltages will be generated on the case surface. This is prevented when the casing is effectively shorted to ground by connecting the receiver case to the zero potential.
The connections 2,3 between the receiver and the other parts of the hearing aid, and also the connection 4 between the case and ground potential could be made by conducting wire. Generally, all 3 wires should be as short as possible as these wires also generate noise. Therefore, the resulting resistance should be in the order of a few milliohms, preferably below 5mOhms.

Claims

1. Digital communication device like a hearing aid or a headset with a power supply, a signal processing device, means for receiving a wireless signal and a receiver or loudspeaker, which produces an audio signal based on a modulated pulsed signal with high frequency shifting rate produced by the signal processing device, where the receiver has a first and a second connection point for receiving the pulsed modulated signal wherein the sound producing parts of the receiver are at least partially enclosed by a metal box, whereby a third connection point is provided which is in electrical contact with the metal of the metal box and whereby this third connection point is connected to the electric circuitry of the communication device at a point having a stable and well defined electrical potential.
2. Digital communication device as claimed in claim 1, wherein the third connection point is connected to ground potential, which is the negative pole of the power supply.
PCT/DK2004/000444 2003-08-26 2004-06-23 Digital communication device Ceased WO2005020549A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/569,412 US20060227988A1 (en) 2003-08-26 2004-06-23 Digital communication device
EP04738941.6A EP1661373B3 (en) 2003-08-26 2004-06-23 Digital communication device
DK04738941.6T DK1661373T6 (en) 2003-08-26 2004-06-23 DIGITAL COMMUNICATION DEVICE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200301219 2003-08-26
DKPA200301219 2003-08-26

Publications (1)

Publication Number Publication Date
WO2005020549A1 true WO2005020549A1 (en) 2005-03-03

Family

ID=34203114

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2004/000444 Ceased WO2005020549A1 (en) 2003-08-26 2004-06-23 Digital communication device

Country Status (4)

Country Link
US (1) US20060227988A1 (en)
EP (1) EP1661373B3 (en)
DK (1) DK1661373T6 (en)
WO (1) WO2005020549A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053876A1 (en) 2007-10-18 2009-04-29 Siemens Medical Instruments Pte. Ltd. Hearing device with single connection for shielding and identification of an earpiece
EP2124481A2 (en) 2008-05-05 2009-11-25 Siemens Medical Instruments Pte. Ltd. Apparatus and method for reducing interferences in a wireless data transmission in hearing aid applications
US9319807B2 (en) 2012-02-28 2016-04-19 Cochlear Limited Device with combined antenna and transducer
EP3588980B1 (en) 2018-06-25 2021-06-02 Sonova AG Ite hearing device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2174518B1 (en) * 2007-07-26 2014-09-10 Phonak AG Resistance identification of a peripheral loudspeaker of a hearing aid
US8189829B2 (en) * 2007-07-26 2012-05-29 Phonak Ag Resistance-based identification
DE102010039303A1 (en) * 2010-08-13 2012-02-16 Siemens Medical Instruments Pte. Ltd. Method for reducing interference and hearing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5796848A (en) * 1995-12-07 1998-08-18 Siemens Audiologische Technik Gmbh Digital hearing aid
US5857060A (en) * 1995-08-02 1999-01-05 Itt Automotive Electrical Systems, Inc. Noise suppression in PWM-driven DC motor
US6546109B1 (en) * 2000-01-03 2003-04-08 Louis Thomas Gnecco Electromagnetically shielded hearing aids

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US5557653A (en) * 1993-07-27 1996-09-17 Spectralink Corporation Headset for hands-free wireless telephone
US5504812A (en) * 1994-10-11 1996-04-02 Motorola, Inc. Headset for use with a radiotelephone
US6424820B1 (en) * 1999-04-02 2002-07-23 Interval Research Corporation Inductively coupled wireless system and method
JP3457626B2 (en) * 2000-04-20 2003-10-20 Ｎｅｃエレクトロニクス株式会社 Jitter detection circuit
US20020127974A1 (en) * 2001-03-09 2002-09-12 Song Chang June Shielded speaker for wireless telephones
CN1554208A (en) * 2001-09-10 2004-12-08 ��ɣ��˹�������� Miniature loudspeaker with integrated signal processing electronics
EP1449404B1 (en) * 2001-11-30 2006-08-30 Sonion A/S A high efficiency driver for miniature loudspeakers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5857060A (en) * 1995-08-02 1999-01-05 Itt Automotive Electrical Systems, Inc. Noise suppression in PWM-driven DC motor
US5796848A (en) * 1995-12-07 1998-08-18 Siemens Audiologische Technik Gmbh Digital hearing aid
US6546109B1 (en) * 2000-01-03 2003-04-08 Louis Thomas Gnecco Electromagnetically shielded hearing aids

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053876A1 (en) 2007-10-18 2009-04-29 Siemens Medical Instruments Pte. Ltd. Hearing device with single connection for shielding and identification of an earpiece
AU2008207442B2 (en) * 2007-10-18 2010-03-04 Sivantos Pte. Ltd. Hearing apparatus with a common connection for shielding and identification of a receiver
US8295517B2 (en) 2007-10-18 2012-10-23 Siemens Medical Instruments Pte. Ltd. Hearing apparatus with a common connection for shielding and identification of a receiver
EP2124481A2 (en) 2008-05-05 2009-11-25 Siemens Medical Instruments Pte. Ltd. Apparatus and method for reducing interferences in a wireless data transmission in hearing aid applications
EP2124481A3 (en) * 2008-05-05 2012-10-24 Siemens Medical Instruments Pte. Ltd. Apparatus and method for reducing interferences in a wireless data transmission in hearing aid applications
US9319807B2 (en) 2012-02-28 2016-04-19 Cochlear Limited Device with combined antenna and transducer
EP3588980B1 (en) 2018-06-25 2021-06-02 Sonova AG Ite hearing device

Also Published As

Publication number Publication date
DK1661373T3 (en) 2018-04-16
EP1661373B3 (en) 2019-07-17
DK1661373T6 (en) 2019-10-21
US20060227988A1 (en) 2006-10-12
EP1661373A1 (en) 2006-05-31
EP1661373B1 (en) 2018-01-17

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