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EP1406468B1 - Prothèse auditive ou système de prothèse auditive avec un générateur de signal d'horloge - Google Patents

Prothèse auditive ou système de prothèse auditive avec un générateur de signal d'horloge Download PDF

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Publication number
EP1406468B1
EP1406468B1 EP03020770A EP03020770A EP1406468B1 EP 1406468 B1 EP1406468 B1 EP 1406468B1 EP 03020770 A EP03020770 A EP 03020770A EP 03020770 A EP03020770 A EP 03020770A EP 1406468 B1 EP1406468 B1 EP 1406468B1
Authority
EP
European Patent Office
Prior art keywords
signal
hearing aid
hearing
frequency
clock
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
EP03020770A
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German (de)
English (en)
Other versions
EP1406468A3 (fr
EP1406468A2 (fr
Inventor
Kunibert Husung
Torsten Dr. Niederdränk
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.)
Sivantos GmbH
Original Assignee
Siemens Audiologische Technik GmbH
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Filing date
Publication date
Application filed by Siemens Audiologische Technik GmbH filed Critical Siemens Audiologische Technik GmbH
Publication of EP1406468A2 publication Critical patent/EP1406468A2/fr
Publication of EP1406468A3 publication Critical patent/EP1406468A3/fr
Application granted granted Critical
Publication of EP1406468B1 publication Critical patent/EP1406468B1/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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils

Definitions

  • the invention relates to a hearing aid or hearing aid system and a method for operating a hearing aid or hearing aid system having at least one input transducer for receiving an input signal and conversion to an electrical signal, an A / D converter for converting the electrical input signal into a digital signal, a digital signal processing unit for processing the digital signal, a clock generator for generating a clock signal with predefined properties for controlling the digital signal processing unit, an output transducer and a transmitting and / or receiving unit for wireless signal transmission between the hearing aid or hearing aid system and another device.
  • a modern hearing aid offers the possibility of wireless signal transmission between the hearing aid and another device, such as another hearing aid, a programmer or an external transceiver.
  • the hearing aid device comprises a transmitting and / or receiving unit.
  • hearing aid systems with a hearing aid device and a transmitting and / or receiving unit are also known, in which the transmitting and / or receiving unit is designed as an independent external unit with respect to the hearing aid, which can be detachably connected to the hearing aid for transmitting and / or receiving connected is.
  • the transmitting and / or receiving unit is then plugged onto the hearing aid and electrically connected via contact and conduit means with this.
  • the transmitting and / or receiving unit is not attached directly to the hearing aid, but is worn as a separate device on the body or clothing of a hearing aid wearer.
  • the connection to the hearing aid then consists only of electrical contact and conduit means.
  • the transmitting and / or receiving units of the devices in question are often designed as so-called "FM systems", so that the transmitted signal is frequency-modulated.
  • modulation of the transmitted signal is not necessarily required nor limited to frequency modulation.
  • a hearing aid is known in which, among other things, a digital noise signal is added to the microphone signal to compensate for acoustic feedback.
  • a network-independently operable medical device in which the clock frequency of at least one digital component can be changed and, in particular, adapted to specific conditions.
  • the clock frequency can be reduced with a far advanced discharge of the voltage source to increase the "remaining term”.
  • WO 02/07479 A1 is a hearing aid system with two portable on the head of a user hearing aids for binaural care of a user known.
  • the clock frequency of the hearing aid system is specified and for this purpose also transmitted to the other hearing aid in particular by means of a wireless connection.
  • signal processing is digital.
  • a clock signal is required.
  • the clock signal of a digital hearing aid is usually not very stable. Oscillating crystals for stabilizing the clock generator can not be used because of their size. Consequently, the clock frequency is slightly temperature and supply voltage dependent. It is therefore only quasi-stable. Nevertheless, the clock signal can also be considered as a uniform, stable signal with a constant period and pulse width for a hearing aid for a period of a few minutes.
  • the hearing aid device and in particular a clocked output stage emit an electromagnetic interference signal with precisely this clock frequency. Furthermore, interference signals occur at multiples of this clock frequency, also called harmonics or harmonics. Thus, it may happen that the receiving unit of the hearing aid device or hearing aid system detects a signal caused by harmonics, although no real received signal for the receiving unit is present.
  • the frequency band in which the received signal is located is normally chosen so that no harmonics of the clock frequency fall into it.
  • a slowly drifting clock frequency of the clock generator can now lead to harmonics of the clock frequency being within the frequency band of the received signal. As a result, the reception is disturbed by the receiving unit.
  • Object of the present invention is therefore to avoid electromagnetic interference at multiples of the clock frequency of a hearing aid in a simple and cost-effective manner.
  • a method for operating a hearing aid or hearing aid system having at least one input transducer for receiving an input signal and conversion into an electrical signal, an A / D converter for converting the electrical input signal into a digital signal, a digital signal processing unit for processing the digital signal, a clock generator for generating a clock signal with predefined properties for controlling the digital signal processing unit, an output transducer and a transmitting and / or receiving unit for wireless signal transmission between the hearing aid or hearing aid system and another device, wherein the clock signal originating from the clock generator is destabilized to a limited extent by frequency fluctuations produced by a jitter unit.
  • a hearing aid or hearing aid system having at least one input transducer for receiving an input signal and conversion into an electrical signal, an A / D converter for converting the electrical input signal into a digital signal, a digital signal processing unit, a clock generator for generating a Clock signal with predefined properties for controlling the digital signal processing unit for processing the digital signal, an output transducer and a transmitting and / or receiving unit for wireless signal transmission between the hearing aid or hearing aid system and another device, wherein the clock generator is associated with a jitter unit for generating frequency fluctuations that destabilize the clock signal to a limited extent.
  • the hearing aid according to the invention is, for example, a hearing aid worn behind the ear, a hearing aid worn in the ear, an implantable hearing aid or a pocket hearing aid. Furthermore, the hearing aid according to the invention may also be part of a plurality of devices for supplying a hearing aid comprising comprehensive hearing aid system, e.g. Part of a hearing aid system with two worn on the head hearing aids for binaural care, part of a hearing aid with a head-worn hearing aid and a portable external processor unit, part of a fully or partially implantable hearing aid system with multiple components, part of a hearing aid system with external additional components such as remote control unit or external microphone unit, etc.
  • comprehensive hearing aid system e.g. Part of a hearing aid system with two worn on the head hearing aids for binaural care, part of a hearing aid with a head-worn hearing aid and a portable external processor unit, part of a fully or partially implantable hearing aid system with multiple components, part of a hearing aid system with external additional components such as remote control unit or
  • a hearing aid generally includes one or more input transducers for receiving an input signal.
  • the input transducer is designed for example as a microphone which receives an acoustic signal and an electrical signal converts.
  • a hearing aid usually includes a signal processing unit for processing and frequency-dependent amplification of the electrical signal.
  • a preferably digital signal processor (DSP) is used, whose operation can be influenced by means of programs or parameters which can be transmitted to the hearing aid.
  • the mode of operation of the signal processing unit can be adapted both to the individual hearing loss of a hearing device wearer and to the current hearing situation in which the hearing aid device is currently being operated.
  • the thus changed electrical signal is finally fed to an output transducer.
  • This is usually designed as a handset, which converts the electrical output signal into an acoustic signal.
  • an implantable output transducer which is directly connected to a ossicle and this stimulates to vibrate.
  • the hearing aid device may comprise a transmitting and / or receiving unit.
  • it can also be part of a hearing aid system with at least one hearing aid device and a transmitting and / or receiving unit, which is arranged as an independent structural unit outside the housing of the hearing aid device.
  • a clock generator which outputs a clock signal with predefined properties.
  • the invention provides that the clock signal is destabilized to a limited extent, ie, even over a short observation period of a few seconds, changes occur in the clock signal. It can so that no longer be regarded as a periodic sequence of successive, equal clock pulses.
  • the period may vary or the pulse width may vary.
  • the edge steepness of the clock pulses may be subject to short-term fluctuations.
  • the destabilization of the clock signal causes both the energy components of the noise generated in the hearing aid with the clock frequency and its harmonics are distributed over a larger frequency band and thus the frequency-specific energy is lower. This in turn means that with appropriately sized fluctuations of the clock signal, the amplitude of an interference signal caused by the harmonics is below the reception threshold of the receiving unit. Harmonics of the clock frequency therefore no longer interfere with the wireless reception of a signal from an external device.
  • the invention offers the advantage that a hearing aid in conjunction with a signal transmission system for wireless signal transmission allows trouble-free communication.
  • An embodiment of the invention provides a jitter unit by which small frequency fluctuations (frequency jitter) are applied to the clock signal.
  • a stable internal clock signal of the clock generator is preferably modulated with a further signal, that is, superimposed on a further signal.
  • the modulation is preferably carried out with a sine or noise signal, wherein the frequency components are advantageously well above the audio frequency range and thus cause no additional distortions or an increased noise in this.
  • the signal modulated with the internal clock signal is preferably selected such that the frequency of the resulting clock signal is centered at a frequency fluctuates.
  • This center frequency can thus still be regarded as the clock frequency of the system, wherein the real clock frequency is then in sliding transition alternately for a few periods above the center frequency and for some periods below the center frequency.
  • the frequency of the clock fluctuations is above the audible audio frequency range, so that the clock fluctuations do not lead to audible distortions in the output of the hearing aid.
  • FIG. 1 shows an embodiment of a hearing aid according to the invention in the block diagram.
  • a microphone 1 receives an acoustic input signal and converts it into an electrical input signal.
  • the electrical input signal is first supplied to a preamplifier and A / D converter unit 2. This converts the analog input signal into a digital input signal.
  • the digital signal processing unit 3 For further processing and frequency-dependent amplification of the digital input signal is the digital signal processing unit 3. This includes the final amplification of a class D amplifier.
  • the processed and amplified signal by means of a receiver 4 in an analog acoustic Output signal converted and delivered.
  • a battery 5 is present.
  • the digital signal processing unit of the hearing aid is connected to a clock generator 6.
  • a telecoil 7 is provided, through which an electromagnetic input signal can be recorded.
  • the hearing aid device further comprises an MTO switch 8, which can be operated by a hearing aid wearer, for selecting the operation via the microphone (switch position M), via the telecoil (switch position T) or for switching off the hearing aid device (switch position O).
  • the hearing aid comprises a programming socket 9 for wired connection with a programming device and a situation button 10 for switching between different hearing programs by the hearing aid wearer.
  • a VC-controller 11 is provided, through which the volume can be adjusted manually on the hearing aid.
  • the hearing aid according to the invention is connected to the wireless signal transmission between the hearing aid and another device, such as another hearing aid, with a transmitting and / or receiving unit 12 which includes an antenna 13.
  • the transmitting and / or receiving unit 12 can be integrated directly into the housing of the hearing aid and thus be part of the hearing aid.
  • the transmitting and / or receiving unit 12 can also have its own housing and form a hearing aid unit as a separate external unit together with the hearing aid.
  • attachment of the external transmitting and / or receiving unit may be provided on the housing of the hearing aid, but the external transmitting and / or receiving unit can also be worn separately on the body, eg as a chest or pocket device, and be connected only via electrical connection means with the hearing aid.
  • the hearing aid according to the invention has a jitter unit 14 connected to the clock generator 6.
  • the jitter unit 14 effects a frequency jitter of the clock signal output from the clock generator 6.
  • the frequency jitter may e.g. caused by the superposition of a stable internal clock signal of the clock generator with a sine signal or with a noise signal.
  • the frequency of the superimposed signal is above the audio frequency range, so that no perceptible interference in the output signal of the hearing aid is produced by the overlays.
  • the frequency fluctuations in the clock signal produced in this way ensure that both the energy components of interference signals with the clock frequency and their harmonics are distributed over a larger frequency band and thus the frequency-specific energy is reduced.
  • Interference signals caused by the clocked mode of operation of the hearing aid device at the clock frequency used and its harmonics can still be detected by the antenna 13 or the telecoil 7, but they are now below the input threshold of the transmitting and / or receiving unit 12 or of the preamplifier A / D converter 2 and thus no longer lead to disturbances of one of the transmitting and / or receiving unit or the telecoil 7 received or delivered useful signal.
  • FIG. 2 shows the frequency spectrum of a received by the transmitting and / or receiving unit 12 electromagnetic signal with a carrier frequency of 1 MHz.
  • the received signal according to FIG. 2 is not disturbed by a clock signal. Otherwise, the signal according to FIG. 3 , In this signal is clearly visible superimposed on a noise signal, which is composed of the harmonics of the clock frequency of the hearing aid.
  • FIG. 4 shows FIG. 4 the interference spectrum without the received signal. If a frequency jitter is now generated at the clock signal in the last-mentioned starting situation according to the invention, then, as in FIG FIG. 5 illustrates the interference spectrum smoothed again.
  • the interference signals are now below a receiving threshold of the transmitting and / or receiving unit 12, whereby a trouble-free signal transmission between the hearing aid and another device is possible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Electric Clocks (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Manipulation Of Pulses (AREA)

Claims (14)

  1. Procédé pour faire fonctionner une prothèse auditive ou un système de prothèse auditive comprenant au moins un transducteur d'entrée pour l'enregistrement d'un signal d'entrée et sa transformation en un signal électrique, un convertisseur A/N pour la conversion du signal d'entrée électrique en un signal numérique, une unité ( 3 ) numérique de traitement de signal pour traiter le signal numérique, un générateur ( 6 ) de cadence pour produire un signal d'horloge ayant des propriétés définies à l'avance pour la commande de l'unité ( 3 ) numérique de traitement du signal, un transducteur de sortie et une unité ( 12 ) d'émission et/ou de réception pour la transmission sans fil du signal entre la prothèse auditive ou le système de prothèse auditive et un autre appareil, caractérisé en ce que l'on déstabilise, dans une mesure limitée par des fluctuations de fréquence produites par une unité de gigue, le signal d'horloge qui est produit par le générateur ( 6 ) de cadence.
  2. Procédé suivant la revendication 1, caractérisé en ce que, pour produire les fluctuations de fréquence, on module, par un autre signal, le signal d'horloge interne produit par le générateur ( 6 ) de cadence.
  3. Procédé suivant la revendication 2, caractérisé en ce que l'on module le signal d'horloge interne par un signal sinusoïdal.
  4. Procédé suivant la revendication 2, caractérisé en ce que l'on module le signal d'horloge interne par un signal de bruit.
  5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que la fréquence de l'autre signal est supérieure au domaine de fréquence audible.
  6. Procédé suivant l'une des revendications 1 à 5, caractérisé en ce que la fréquence du signal d'horloge fluctue autour d'une fréquence médiane.
  7. Prothèse auditive ou système de prothèse auditive ayant au moins un transducteur d'entrée pour l'enregistrement d'un signal d'entrée et sa transformation en un signal électrique, un convertisseur A/N pour la conversion du signal d'entrée électrique en un signal numérique, une unité ( 3 ) numérique de traitement du signal pour le traitement du signal numérique, un générateur ( 6 ) de cadence pour la production d'un signal d'horloge ayant des propriétés définies à l'avance pour la commande de l'unité ( 3 ) numérique de traitement du signal, un convertisseur de sortie et une unité ( 12 ) d'émission et/ou de réception pour la transmission sans fil du signal entre la prothèse auditive ou le système de prothèse auditive et un autre appareil, caractérisée en ce qu'au générateur ( 6 ) de cadence est associé une unité ( 14 ) de gigue pour la production de fluctuations de fréquence, qui déstabilisent le signal d'horloge dans une mesure limitée.
  8. Prothèse auditive ou système de prothèse auditive suivant la revendication 7, caractérisée en ce que, pour la production des fluctuations des fréquences, un signal d'horloge interne du générateur ( 6 ) de cadence peut être modulé par un autre signal.
  9. Prothèse auditive ou système de prothèse auditive suivant la revendication 8, caractérisée en ce que le signal d'horloge interne peut être modulé par un signal sinusoïdal.
  10. Prothèse auditive ou système de prothèse auditive suivant la revendication 8, caractérisée en ce que le signal d'horloge interne peut être modulé par un signal de bruit.
  11. Prothèse auditive ou système de prothèse auditive suivant l'une des revendications 8 à 10, caractérisée en ce que la fréquence de l'autre signal est supérieure au domaine de fréquence audible.
  12. Prothèse auditive ou système de prothèse auditive suivant l'une des revendications 7 à 11, caractérisée en ce que la fréquence du signal d'horloge fluctue autour d'une fréquence médiane.
  13. Prothèse auditive ou système de prothèse auditive suivant l'une des revendications 7 à 12, caractérisée en ce que l'unité ( 12 ) d'émission et/ou de réception est intégrée dans la prothèse auditive.
  14. Système de prothèse auditive suivant l'une des revendications 7 à 12, caractérisée par une prothèse auditive et par une unité ( 12 ) d'émission et/ou de réception extérieure, reliée à la prothèse auditive.
EP03020770A 2002-09-30 2003-09-12 Prothèse auditive ou système de prothèse auditive avec un générateur de signal d'horloge Expired - Lifetime EP1406468B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10245556A DE10245556B3 (de) 2002-09-30 2002-09-30 Hörhilfegerät oder Hörgerätesystem mit einem Taktgenerator und Verfahren zu deren Betrieb
DE10245556 2002-09-30

Publications (3)

Publication Number Publication Date
EP1406468A2 EP1406468A2 (fr) 2004-04-07
EP1406468A3 EP1406468A3 (fr) 2008-11-05
EP1406468B1 true EP1406468B1 (fr) 2010-08-04

Family

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Application Number Title Priority Date Filing Date
EP03020770A Expired - Lifetime EP1406468B1 (fr) 2002-09-30 2003-09-12 Prothèse auditive ou système de prothèse auditive avec un générateur de signal d'horloge

Country Status (5)

Country Link
US (1) US7421085B2 (fr)
EP (1) EP1406468B1 (fr)
AT (1) ATE476831T1 (fr)
DE (2) DE10245556B3 (fr)
DK (1) DK1406468T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK1624723T3 (da) * 2004-08-02 2012-09-03 Siemens Audiologische Technik Stabilisering af systemtakten ved et høreapparat
AU2005325015B2 (en) * 2005-01-17 2009-04-30 Widex A/S Apparatus and method for operating a hearing aid
US8520881B2 (en) * 2007-04-16 2013-08-27 Siemens Medical Instruments Pte. Ltd. Hearing apparatus with low-interference receiver control and corresponding method
DE102007018121B4 (de) 2007-04-16 2012-12-06 Siemens Medical Instruments Pte. Ltd. Hörvorrichtung mit störarmer Höreransteuerung und entsprechendes Verfahren sowie Hörsystem
EP2147570A1 (fr) * 2007-05-24 2010-01-27 Phonak AG Dispositif auditif à communication rf
US8213652B2 (en) 2007-07-02 2012-07-03 Siemens Medical Instruments Pte. Ltd. Multi-component hearing aid system and a method for its operation

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US3781695A (en) * 1972-05-04 1973-12-25 Westinghouse Electric Corp Digital phase-locked-loop
US4818950A (en) * 1987-04-24 1989-04-04 Ncr Corporation Low jitter phase-locked loop
US4862485A (en) * 1987-10-14 1989-08-29 National Semiconductor Corporation Quotient phase-shift processor for digital phase-locked-loops
DK170600B1 (da) * 1992-03-31 1995-11-06 Gn Danavox As Høreapparat med kompensation for akustisk tilbagekobling
JPH0795056A (ja) * 1993-05-10 1995-04-07 Internatl Business Mach Corp <Ibm> 可変周波数基準クロック生成装置
US5721783A (en) * 1995-06-07 1998-02-24 Anderson; James C. Hearing aid with wireless remote processor
DE19734222A1 (de) * 1997-08-07 1999-02-18 Siemens Audiologische Technik Schaltung und Verfahren zur Digitalwandlung einer analogen Stellgröße in einem digitalen Hörgerät
US6329929B1 (en) * 1998-12-21 2001-12-11 Medtronic Inc. Telemetry system with phase-locking noise suppressing receiver
DE19941859C2 (de) * 1999-09-02 2002-06-13 Siemens Audiologische Technik Digitales Hörhilfegerät
US6411151B1 (en) * 1999-12-13 2002-06-25 Inter Corporation Low jitter external clocking
EP1316240B1 (fr) * 2000-07-14 2005-11-09 GN ReSound as Systeme auditif biauriculaire synchronise
US7227920B2 (en) * 2001-06-26 2007-06-05 Nokia Corporation Circuit and method for correcting clock duty cycle
ATE347245T1 (de) * 2001-09-21 2006-12-15 Microsound As Hörgerät mit leistungsoptimiertem stromverbrauch für variablen takt, variable versorgungsspannung und variable dsp-verarbeitungsparameter
US20030210029A1 (en) * 2002-05-07 2003-11-13 Billy Antheunisse Coherent clock measurement unit
DK1367857T3 (da) * 2002-05-30 2012-06-04 Gn Resound As Fremgangsmåde til dataregistrering i en høreprotese

Also Published As

Publication number Publication date
DE50312942D1 (de) 2010-09-16
ATE476831T1 (de) 2010-08-15
US7421085B2 (en) 2008-09-02
EP1406468A3 (fr) 2008-11-05
DE10245556B3 (de) 2004-04-22
DK1406468T3 (da) 2010-11-08
US20040109577A1 (en) 2004-06-10
EP1406468A2 (fr) 2004-04-07

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