EP0793897B1 - Hörhilfsgerät - Google Patents
Hörhilfsgerät Download PDFInfo
- Publication number
- EP0793897B1 EP0793897B1 EP95921771A EP95921771A EP0793897B1 EP 0793897 B1 EP0793897 B1 EP 0793897B1 EP 95921771 A EP95921771 A EP 95921771A EP 95921771 A EP95921771 A EP 95921771A EP 0793897 B1 EP0793897 B1 EP 0793897B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- hearing aid
- low
- clock
- output
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000006870 function Effects 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 206010011878 Deafness Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000010370 hearing loss Effects 0.000 description 1
- 231100000888 hearing loss Toxicity 0.000 description 1
- 208000016354 hearing loss disease Diseases 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
Definitions
- the invention relates to a hearing aid with a microphone, a transmission part for signal processing and an output amplifier with connected Listener.
- Output amplifiers for hearing aids should have low distortion have a low energy requirement, even with high output power.
- Class B amplifiers are more efficient than A amplifiers.
- Amplifiers of this type have also hitherto been customary in hearing aids.
- D-amplifiers are e.g. in the European patent application o 590 903 Al from Exar Corporation and in US-A 5,247,581 from Exar Corporation and US-A 4,689,819 and US-A 4,592,087 to Industrial Research Products Inc. discloses and describes in detail.
- the rectangular pulse sequence of an oscillator lying in the ultrasound range is an integrator supplied, which also the output voltage of a low frequency signal is supplied by a microphone via an amplifier train arrives and serves as a preload.
- the output signal of the integrator is then a triangular pulse train, the zero crossings through the Bias voltage supplied to the integrator varies in the hearing frequency range will. That is, this low-frequency bias makes the zero crossings of the triangular signal from one symmetrical to the axis of symmetry Course without bias signal variable to asymmetrical conditions shifted, the asymmetry in terms of sign and size a continuously changing function of the amplitude of the low frequency Input signal is.
- Such D-amplifiers working with pulse width modulation have a very good efficiency and have almost no cross modulation.
- a disadvantage of the D-amplifier with pulse width modulation is that the pulse width changes either continuously or in very small steps should be achieved when a high signal to noise ratio is reached shall be.
- the known class D output amplifiers use a continuous one Modulation, i.e. a continuous variation in pulse width and need hence a continuous microphone output signal as an input signal. If the signal processing preceding the output amplifier is time-discrete and / or amplitude discretely, then this digital signal must first e.g. converted into a holding network or a digital / analog converter will. This represents an additional effort that can hardly be sold.
- EP-A 0495328 e.g. known as a sigma-delta converter particularly suitable as an A / D converter with discrete components.
- circuits are for use in hearing aids with highly integrated ones digital circuits less suitable.
- EP-A0597523 discloses a fast D / A converter which is made of a sigma-delta converter and a downstream asynchronous Sigma-delta modulator consists of the output signal of the sigma-delta converter generates an ambivalent, asynchronously modulated signal, which is then fed to a low pass filter.
- the effort for the output amplifier is a fully digitized one Hearing aid too high. In addition, it does not allow a high signal / noise ratio achieve.
- a hearing aid which consists of an ear part to be carried and a part connected by a cable to the body supporting signal processing part, in which over an A / D converter a digital signal processing and a subsequent D / A converter Adaptation of the transfer function of the hearing aid to the auditory deficit Carrier should be reached.
- EP-A 0578021 discloses a hearing aid, but not one Signa-Delta converter contains a normal A / D converter, one Signal processing and a D / A converter.
- the invention therefore goes a completely different way, the use of D / A converters of the usual type in the output amplifier of a fully digital Avoids hearing aid.
- the invention is therefore intended to provide a hearing aid device with a novel, essential simpler output amplifiers are proposed, in which a relative high signal / noise ratio can be achieved with extremely low power requirements and high output power with minimal distortion and anything Lack of cross-modulation and control of the output amplifier with a digital input signal.
- the output amplifier can completely be constructed as a digital highly integrated CMOS circuit.
- FIG. 1 shows, for example, a hearing aid with a novel output amplifier, however, its use is not limited to use in hearing aids is limited, but is generally applicable to digital amplifiers where it comes down to a high ratio of useful signal to interference signal.
- the acoustic Signal recorded by a microphone 1 and in a low-pass filter Antialiasing filter is limited to a frequency range that is common in hearing aids.
- This low-frequency signal is now in a signal processor 3rd subjected to signal processing. Among them is e.g. to understand that the analog input signal is either further processed analogously in the manner that the amplifier characteristic of the signal processor to that for the respective Hearing damage or hearing loss of its wearer regarding all necessary variables is adjusted.
- Such variable which are dependent on the frequency, are e.g. the Amplification of the individual stages, the limit level, the compression threshold, the automatic gain control with its response and Fall times, a combination of compression and expansion, or whatever a non-linear course of the amplification of individual stages or overall all levels, as well as the output sound pressure level.
- the signal processor would have to have a digital-to-analog converter on the input side included, for which a separate clock generator for the clock would be required.
- a separate clock generator for the clock would be required.
- a new output amplifier then follows the signal processor 3.
- This consists essentially of a signal converter 4, which is essentially a ⁇ - ⁇ converter.
- This signal converter first contains a subtraction stage 5 with two inputs, namely a positive input and a negative Input, with the positive input at the output of the signal processor 3 connected.
- a low-pass filter 6 follows this subtraction stage 5
- the low-pass filter 6 could be an integrator.
- On a comparator 7 with holding network is connected to this integrator 6.
- the output of this comparison stage is via a feedback connection connected to the negative input of subtracting stage 5.
- a High-frequency clock generator 8 is provided, which is a high-frequency clock pulse signal with a frequency in the range of about 1 MHz to the comparison stage 7 issues.
- the output of the signal converter 4 is via a low-pass function connected to the handset 10.
- a clock generator required for the signal processor 3 is essential lower frequency is preferably by the high frequency clock generator 8 synchronized. This can be done simply by frequency division, for example can be achieved with a factor M.
- a typical clock frequency for the signal processor 3 could be about 32 kHz.
- the mode of operation of the signal converter 4 should be based on FIGS. 2 and 3 are explained.
- the high-frequency clock signal 11 of the clock pulse generator 8 is, as already mentioned, forwarded to comparison level 7.
- the digital input signal 12 in FIG. 3 (an extremely simplified representation) is the subtracting level at their positive input fed.
- the output signal 14 of the signal converter 4 reaches the negative input of the via a feedback connection Subtracting stage and is subtracted there from the input signal 12.
- the resulting output signal is the integrator 6 (which here Represents low-pass filter) and integrated there to the output signal 13.
- This signal 13 is synchronized in the comparison stage 7 with holding network with the edges of the high-frequency clock signal into the output signal 14 converted, which has only two possible values, here the simplicity are shown as +1 and -1 for the sake of convenience.
- the input signal 12 should initially have the value -0.5.
- the integrated Signal 13 then rises from -1.5 to zero, resulting in a first output pulse transition from -1 to +1.
- the integrated signal then drops again to -1.5, after which the output signal 14 again assumes the value -1.
- the output signal 14 of the signal converter 4 in addition the desired increased low-frequency component a strong high-frequency component Contains signal portion, which of course is an unwanted interference signal represents e.g. must be removed by a passive low-pass filter.
- This new output amplifier especially suitable for hearing aids has a number of advantages. All pulse edges are with a known one Clock frequency synchronized, which can also be used to the essential for the upstream signal processor, at essential synchronize lower clock frequency working clock pulse generator.
- the input signal of the output amplifier can be a digital signal be, and the output amplifier can be designed as a pure digital circuit will. I.e. but that the entire circuit is constructed as a digital circuit can be, only at the input of the signal processor 3 Analog / digital Vandler would have to be provided. This results in the further one Possibility of using the entire circuit in C-MOS technology as a highly integrated Build circuit.
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)
- Amplifiers (AREA)
- Adornments (AREA)
- Finger-Pressure Massage (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Description
- Fig. 1
- ein Prinzipschaltbild eines Hörhilfsgerätes mit einem Ausgangsverstärker gemäß der Erfindung ;
- Fig. 2
- einen in dem Ausgangsverstärker des Hörhilfsgerätes verwendeten Signalkonverter und
- Fig. 3
- Impulsdiagramme zur Erläuterung der Arbeitsweise des Ausgangsverstärkers des Hörhilfsgerätes.
Claims (5)
- Hörhilfsgerät mit einem Mikrofon (1), einem Übertragungsteil (2, 3) für die Signalverarbeitung und einem Ausgangsverstärker (4) mit daran angeschlossenem Hörer (10), welcher Verstärker im wesentlichen aus einem als Σ-Δ Konverter aufgebauten Signalkonverter mit einem daran angeschlossenen, ein hochfrequentes Taktsignal erzeugenden Taktimpulsgenerator (8) und einer nachgeschalteten Tiefpaßfunktion (15) besteht, sowie mit einer Batterie für die Spannungsversorgung, dadurch gekennzeichnet, daß das Eingangssignal des Signalkonverters eine aus mehreren Bits / Bytes bestehende digitale Darstellung des Eingangssignals des Hörhilfsgerätes ist, daß dieses Eingangssignal in dem Signalkonverter in ein Ausgangssignal (14) umwandelbar ist, das nur zwei mögliche Signalwerte aufweist, und daß dieses Ausgangssignal (14) nach Durchlaufen der Tiefpaßfunktion im wesentlichen als verstärktes Abbild des niederfrequenten Eingangssignals des Hörhilfsgerätes erscheint.
- Hörhilfsgerät nach Anspruch 1, dadurch gekennzeichnet, daß der eingangsseitig an den Übertragungsteil (2, 3) angeschlossene Signalkonverter (4) im wesentlichen aus einer Subtrahierstufe (5) mit einem positiven und einem negativen Eingang, einem Tiefpaßfilter (6) und einer durch den Taktimpulsgenerator (8) mit hochfrequenten Taktimpulsen (11) gesteuerten Vergleichsschaltung (7) mit Haltenetzwerk besteht, wobei der positive Eingang der Subtrahierstufe (5) mit dem Übertragungsteil (2, 3) und der negative Eingang der Subtrahierstufe mit dem Ausgang der Vergleichsstufe (7) über eine Rückkopplungsverbindung verbunden ist.
- Hörhilfsgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Taktfrequenz der durch den Taktimpulsgenerator (8) erzeugten Taktimpulse im Bereich von 1 MHz liegt.
- Hörhilfsgerät nach Anspruch 1, dadurch gekennzeichnet, daß das von einem Taktgenerator (9) zur Taktgabe an den Signalprozessor (3) abgegebene Taktsignal durch das hochfrequente Taktsignal (11) des Taktimpulsgenerators (8) synchronisierbar ist.
- Hörhilfsgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Tiefpaßfunktion durch die elektrischen, akustischen und mechanischen Eigenschaften des Hörers (10) und gegebenenfalls des menschlichen Ohres gebildet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4441996 | 1994-11-26 | ||
DE4441996A DE4441996A1 (de) | 1994-11-26 | 1994-11-26 | Hörhilfsgerät |
PCT/EP1995/002033 WO1996017493A1 (de) | 1994-11-26 | 1995-05-29 | Hörhilfsgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0793897A1 EP0793897A1 (de) | 1997-09-10 |
EP0793897B1 true EP0793897B1 (de) | 1998-05-13 |
Family
ID=6534142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95921771A Expired - Lifetime EP0793897B1 (de) | 1994-11-26 | 1995-05-29 | Hörhilfsgerät |
Country Status (9)
Country | Link |
---|---|
US (1) | US5878146A (de) |
EP (1) | EP0793897B1 (de) |
JP (1) | JP3274469B2 (de) |
AT (1) | ATE166199T1 (de) |
AU (1) | AU691001B2 (de) |
CA (1) | CA2204757C (de) |
DE (2) | DE4441996A1 (de) |
DK (1) | DK0793897T3 (de) |
WO (1) | WO1996017493A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1694095A2 (de) | 2005-02-15 | 2006-08-23 | Siemens Audiologische Technik GmbH | Hörhilfegerät mit einem Ausgangsverstärker, der einen Sigma-Delta-Modulator umfasst |
WO2022200436A1 (en) | 2021-03-24 | 2022-09-29 | Widex A/S | An ear level audio device and a method of operating an ear level audio device |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5754131A (en) * | 1996-07-01 | 1998-05-19 | General Electric Company | Low power delta sigma converter |
US6044162A (en) * | 1996-12-20 | 2000-03-28 | Sonic Innovations, Inc. | Digital hearing aid using differential signal representations |
US6144748A (en) * | 1997-03-31 | 2000-11-07 | Resound Corporation | Standard-compatible, power efficient digital audio interface |
DE19736406B4 (de) * | 1997-08-21 | 2007-05-16 | Siemens Ag | Einrichtung zum Steuern eines automatischen Getriebes für ein Kraftfahrzeug |
US5995036A (en) * | 1998-03-17 | 1999-11-30 | Sonic Innovations, Inc. | Passive switched capacitor delta analog-to-digital converter with programmable gain control |
WO2000044198A1 (en) * | 1999-01-25 | 2000-07-27 | Tøpholm & Westermann APS | Hearing aid system and hearing aid for in-situ fitting |
AU753295B2 (en) * | 1999-02-05 | 2002-10-17 | Widex A/S | Hearing aid with beam forming properties |
US6163287A (en) | 1999-04-05 | 2000-12-19 | Sonic Innovations, Inc. | Hybrid low-pass sigma-delta modulator |
US6408318B1 (en) | 1999-04-05 | 2002-06-18 | Xiaoling Fang | Multiple stage decimation filter |
US6445321B2 (en) | 1999-04-05 | 2002-09-03 | Sonic Innovations, Inc. | Hybrid low-pass sigma-delta modulator |
US6313773B1 (en) | 2000-01-26 | 2001-11-06 | Sonic Innovations, Inc. | Multiplierless interpolator for a delta-sigma digital to analog converter |
DE60105819T2 (de) | 2000-07-05 | 2005-10-06 | Koninklijke Philips Electronics N.V. | A/d umwandler mit integrierter vorspannung für mikrofon |
EP1251714B2 (de) | 2001-04-12 | 2015-06-03 | Sound Design Technologies Ltd. | Digitales Hörgerätsystem |
US6633202B2 (en) | 2001-04-12 | 2003-10-14 | Gennum Corporation | Precision low jitter oscillator circuit |
CA2382358C (en) * | 2001-04-18 | 2007-01-09 | Gennum Corporation | Digital quasi-rms detector |
ATE318062T1 (de) * | 2001-04-18 | 2006-03-15 | Gennum Corp | Mehrkanal hörgerät mit übertragungsmöglichkeiten zwischen den kanälen |
US20020191800A1 (en) * | 2001-04-19 | 2002-12-19 | Armstrong Stephen W. | In-situ transducer modeling in a digital hearing instrument |
EP1284587B1 (de) | 2001-08-15 | 2011-09-28 | Sound Design Technologies Ltd. | Rekonfigurierbare Hörhilfevorrichtung mit niedrigem Leistungsverbrauch |
US7315626B2 (en) * | 2001-09-21 | 2008-01-01 | Microsound A/S | Hearing aid with performance-optimized power consumption for variable clock, supply voltage and DSP processing parameters |
CN1608393B (zh) | 2001-11-30 | 2011-08-24 | 桑尼昂公司 | 一种小型扬声器的高效率驱动器 |
WO2007106399A2 (en) | 2006-03-10 | 2007-09-20 | Mh Acoustics, Llc | Noise-reducing directional microphone array |
US8098844B2 (en) * | 2002-02-05 | 2012-01-17 | Mh Acoustics, Llc | Dual-microphone spatial noise suppression |
US7171008B2 (en) * | 2002-02-05 | 2007-01-30 | Mh Acoustics, Llc | Reducing noise in audio systems |
GB2386280B (en) * | 2002-03-07 | 2005-09-14 | Zarlink Semiconductor Inc | Digital microphone |
EP1429455A1 (de) * | 2002-12-11 | 2004-06-16 | Dialog Semiconductor GmbH | Linearisierung eines PDM-Klasse-D Verstärkers |
CA2619028A1 (en) | 2005-08-23 | 2007-03-01 | Widex A/S | Hearing aid with increased acoustic bandwidth |
EP2417778B1 (de) | 2009-04-06 | 2015-06-17 | Widex A/S | Zweiteiliges hörgerät mit datenbusverbindung |
US8553897B2 (en) | 2009-06-09 | 2013-10-08 | Dean Robert Gary Anderson | Method and apparatus for directional acoustic fitting of hearing aids |
US8879745B2 (en) * | 2009-07-23 | 2014-11-04 | Dean Robert Gary Anderson As Trustee Of The D/L Anderson Family Trust | Method of deriving individualized gain compensation curves for hearing aid fitting |
US9101299B2 (en) * | 2009-07-23 | 2015-08-11 | Dean Robert Gary Anderson As Trustee Of The D/L Anderson Family Trust | Hearing aids configured for directional acoustic fitting |
EP2544587B1 (de) | 2010-03-09 | 2023-05-10 | T&W Engineering A/S | Zweiteiliger eeg-monitor mit datenbus und verfahren zur kommunikation zwischen den teilen |
WO2011110218A1 (en) | 2010-03-09 | 2011-09-15 | Widex A/S | Two part hearing aid with databus and method of communicating between the parts |
US8942397B2 (en) | 2011-11-16 | 2015-01-27 | Dean Robert Gary Anderson | Method and apparatus for adding audible noise with time varying volume to audio devices |
US9582452B2 (en) * | 2013-06-05 | 2017-02-28 | The Boeing Company | Sensor network using pulse width modulated signals |
US10142742B2 (en) | 2016-01-01 | 2018-11-27 | Dean Robert Gary Anderson | Audio systems, devices, and methods |
DK180177B1 (en) | 2018-04-30 | 2020-07-16 | Widex As | Method of operating a hearing aid system and a hearing aid system |
US11696083B2 (en) | 2020-10-21 | 2023-07-04 | Mh Acoustics, Llc | In-situ calibration of microphone arrays |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3205685A1 (de) * | 1982-02-17 | 1983-08-25 | Robert Bosch Gmbh, 7000 Stuttgart | Hoergeraet |
US4887299A (en) * | 1987-11-12 | 1989-12-12 | Nicolet Instrument Corporation | Adaptive, programmable signal processing hearing aid |
NO169689C (no) * | 1989-11-30 | 1992-07-22 | Nha As | Programmerbart hybrid hoereapparat med digital signalbehandling samt fremgangsmaate ved deteksjon og signalbehandlingi samme. |
EP0495328B1 (de) * | 1991-01-15 | 1996-07-17 | International Business Machines Corporation | Sigma-Delta Wandler |
US5448644A (en) * | 1992-06-29 | 1995-09-05 | Siemens Audiologische Technik Gmbh | Hearing aid |
EP0597523B1 (de) * | 1992-11-09 | 1997-07-23 | Koninklijke Philips Electronics N.V. | Digital-/Analogwandler |
-
1994
- 1994-11-26 DE DE4441996A patent/DE4441996A1/de not_active Withdrawn
-
1995
- 1995-05-29 WO PCT/EP1995/002033 patent/WO1996017493A1/de active IP Right Grant
- 1995-05-29 AT AT95921771T patent/ATE166199T1/de not_active IP Right Cessation
- 1995-05-29 JP JP50832196A patent/JP3274469B2/ja not_active Expired - Lifetime
- 1995-05-29 DE DE59502189T patent/DE59502189D1/de not_active Expired - Lifetime
- 1995-05-29 DK DK95921771T patent/DK0793897T3/da active
- 1995-05-29 EP EP95921771A patent/EP0793897B1/de not_active Expired - Lifetime
- 1995-05-29 CA CA002204757A patent/CA2204757C/en not_active Expired - Lifetime
- 1995-05-29 AU AU26714/95A patent/AU691001B2/en not_active Expired
- 1995-05-29 US US08/836,260 patent/US5878146A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1694095A2 (de) | 2005-02-15 | 2006-08-23 | Siemens Audiologische Technik GmbH | Hörhilfegerät mit einem Ausgangsverstärker, der einen Sigma-Delta-Modulator umfasst |
DE102005006858A1 (de) * | 2005-02-15 | 2006-09-07 | Siemens Audiologische Technik Gmbh | Hörhilfegerät mit einem Ausgangsverstärker, der einen Sigma-Delta-Modulator umfasst |
WO2022200436A1 (en) | 2021-03-24 | 2022-09-29 | Widex A/S | An ear level audio device and a method of operating an ear level audio device |
Also Published As
Publication number | Publication date |
---|---|
AU691001B2 (en) | 1998-05-07 |
CA2204757A1 (en) | 1996-06-06 |
CA2204757C (en) | 1999-08-03 |
DK0793897T3 (da) | 1999-02-15 |
EP0793897A1 (de) | 1997-09-10 |
ATE166199T1 (de) | 1998-05-15 |
DE4441996A1 (de) | 1996-05-30 |
WO1996017493A1 (de) | 1996-06-06 |
JP3274469B2 (ja) | 2002-04-15 |
DE59502189D1 (de) | 1998-06-18 |
US5878146A (en) | 1999-03-02 |
JPH10504155A (ja) | 1998-04-14 |
AU2671495A (en) | 1996-06-19 |
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