EP0793897A1 - Hearing aid - Google Patents
Hearing aidInfo
- Publication number
- EP0793897A1 EP0793897A1 EP95921771A EP95921771A EP0793897A1 EP 0793897 A1 EP0793897 A1 EP 0793897A1 EP 95921771 A EP95921771 A EP 95921771A EP 95921771 A EP95921771 A EP 95921771A EP 0793897 A1 EP0793897 A1 EP 0793897A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- hearing aid
- low
- input
- 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.)
- Granted
Links
- 230000006870 function Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 206010011878 Deafness Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 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
- 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 a receiver connected to it.
- Output amplifiers for hearing aids should have low energy consumption in addition to low distortion, 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, for example. in European Patent Application o 590 903 AI from Exar Corporation and in US Pat. Nos. 5, 247,581 to Exar Corporation and US Pat. Nos. 4,689,819 and 4,592,087 to Industrial Research Products Inc. disclosed and described in detail.
- the rectangular pulse sequence of an oscillator which is in the ultrasound range, is fed to an integrator, which is also fed the output voltage of a low-frequency signal, which arrives from a microphone via an amplifier train and serves as a bias voltage.
- the output signal of the integrator is then a triangular pulse train, the zero crossings through which Integrator supplied bias lying in the hearing frequency range can be varied. I.e. , this low-frequency bias voltage shifts the zero crossings of the triangular signal from a course symmetrical to the axis of symmetry without bias signal to asymmetrical conditions, the asymmetry in terms of sign and size being a continuously changing function of the amplitude of the low-frequency input signal.
- 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 should be changed either continuously or in very small steps if a high signal to noise ratio is to be achieved.
- the known class D output amplifiers use continuous modulation, i.e. a continuous variation of the pulse width and therefore require a continuous output signal from the microphone as an input signal. If the signal processing preceding the output amplifier is time-discrete and / or amplitude-discrete, then this digital signal must first e.g. be converted into a network or a digit / analog converter. This represents an unreasonable additional effort.
- the invention is therefore intended to propose a hearing aid with a novel, considerably simpler output amplifier, in which a relatively high signal / noise ratio can be achieved, with extremely low power requirements and high output power, with minimal distortion and any lack of cross modulation and a possible control of the output signal with a digital or an analog input signal.
- the output amplifier can be constructed completely as a digitally highly integrated CMOS circuit.
- Fig. 1 shows a basic circuit diagram of a hearing aid with an output amplifier according to the invention
- Fig. 2 a Signa icon converter used in the output amplifier of the hearing aid
- Output amplifier of the hearing aid. 1 shows, for example, a hearing aid device with a novel output amplifier, the use of which is not limited to the use in hearing aid devices, but is generally applicable to digital amplifiers where a high ratio of useful signal to interference signal is important.
- the acoustic signal is picked up by a microphone 1 and limited in a low-pass filter as an anti-aliasing filter to a frequency range customary in hearing aids.
- This low-frequency signal is now subjected to signal processing in a signal processor 3.
- the analog input signal is either further processed analogously in such a way that the amplifier characteristic of the signal processor is adapted to the variables required for the respective hearing damage or hearing loss of its wearer with respect to all the variables.
- Such variable which are dependent on the frequency, are, for example. the amplification of the individual stages, the limit level, the compression threshold, the automatic amplification control with its response and decay times, a combination of compression and expansion or a non-linear course of the amplification of individual stages or all stages in total, as well as the output switching Pressure level.
- the signal processor on the input side would have to contain a digital-analog log converter, for which a separate clock generator would be required for the clock.
- a new output amplifier then follows the Signal processor 3.
- This consists essentially of a signal converter 4, which is essentially a is.
- This signal converter first contains a subtractor stage 5 with two inputs, namely a positive input and a negative input, the positive input being connected to the output of the signal processor 3.
- This subtraction stage 5 is followed by a low-pass filter 6.
- the low-pass filter 6 could be an integrator.
- a comparison stage 7 with a holding network is connected to this integrator 6.
- the output of this comparison stage is connected via a feedback connection to the negative input of the subtraction stage 5.
- a high-frequency clock generator 8 is provided, which sends a high-frequency clock pulse signal with a frequency in the range of approximately 1 MHz to the comparison stage
- the output of the Signa Ikon age 4 is connected to the receiver 10 via a low-pass function.
- a clock generator with a significantly lower frequency required for the signal processor 3 is preferably provided by the high-frequency clock generator
- a typical clock frequency for the signal processor 3 could be about 32 kHz.
- the high-frequency clock signal 11 of the clock generator 8 is fed to the comparison stage 7.
- the digital input signal 12 in FIG. 3 (an extremely simplified representation) is fed to the subtraction stage at its positive input.
- the output signal 14 of the signal converter 4 reaches the negative input of the subtraction stage via a feedback connection and is subtracted there from the input signal 12.
- the resulting output signal is fed to the integrator 6 (which represents the low-pass filter here) and integrated there to form the output signal 13.
- This signal 13 is converted in the comparison stage 7 with holding network synchronously with the edges of the high-frequency clock signal into the output signal 14, which has only two possible values, which for the sake of simplicity are shown here as +1 and -1.
- the input signal 12 should initially have the value -0.5.
- the integrated signal 13 then rises from -1.5 to zero, which results 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 subsequent rise in the input signal 12 to the value zero results in a steeper rise in the integrated signal 13 to the value 0.5.
- the corresponding signal values of the output signal 14 between -1 and +1 are then obtained via the integration, the values -1 corresponding to the lower value of the integrated signal and the values +1 to the upper value of the integrated signal .
- the further values of the input signal of 0.3, 0.6 and 1.0 are converted into corresponding pulses of the output signal 14 via the integration. I.e. in the output signal 14 the ratio of positive values to negative values per time unit changes depending on the input signal 12.
- the analog signal When converting a low-frequency analog signal into a digital signal by time-discrete and / or amplitude-discrete conversion, the analog signal is quantized.
- the stages of the input signal 12 shown in FIG. 3 therefore represent corresponding amplitude steps of a quantized analog signal.
- clock pulse frequencies of z. B. 100 kHz is sufficient, in the present case, to achieve a large ratio of useful signal to interference signal, significantly higher clock pulse frequencies are required, which can be, for example, in the range of 1 MHz.
- the output signal 14 of the signal converter 4 contains, in addition to the desired amplified low-frequency component, a strong high-frequency signal component which, of course, represents an undesired interference signal which, for example, must be removed by a passive low-pass filter.
- this output amplifier is used in a hearing aid, then the inductance of the voice coil of the listener and the low-pass properties of the mechanical and acoustic system of the hearing aid and the human ear can take over this low-pass function completely, so that a separate low-pass filter appears to be unnecessary.
- This novel output amplifier which is particularly suitable for hearing aids, has a number of advantages. All pulse edges are synchronized with a known clock pulse frequency, which can also be used to synchronize the clock pulse generator required for the upstream signal processor, which operates at a significantly lower clock frequency.
- the input signal of the output amplifier can be a digital signal and the output amplifier can be designed as a pure digital circuit. Ie. but that the entire circuit can be constructed as a digital circuit, an analog / digital converter only having to be provided at the input of the signal processor 3. This results in the further possibility of building up the entire circuit using C-MOS technology as a highly integrated 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4441996A DE4441996A1 (en) | 1994-11-26 | 1994-11-26 | Hearing aid |
DE4441996 | 1994-11-26 | ||
PCT/EP1995/002033 WO1996017493A1 (en) | 1994-11-26 | 1995-05-29 | Hearing aid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0793897A1 true EP0793897A1 (en) | 1997-09-10 |
EP0793897B1 EP0793897B1 (en) | 1998-05-13 |
Family
ID=6534142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95921771A Expired - Lifetime EP0793897B1 (en) | 1994-11-26 | 1995-05-29 | Hearing aid |
Country Status (9)
Country | Link |
---|---|
US (1) | US5878146A (en) |
EP (1) | EP0793897B1 (en) |
JP (1) | JP3274469B2 (en) |
AT (1) | ATE166199T1 (en) |
AU (1) | AU691001B2 (en) |
CA (1) | CA2204757C (en) |
DE (2) | DE4441996A1 (en) |
DK (1) | DK0793897T3 (en) |
WO (1) | WO1996017493A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019211187A1 (en) | 2018-04-30 | 2019-11-07 | Widex A/S | Method of operating a hearing aid system and a hearing aid system |
Families Citing this family (38)
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 (en) * | 1997-08-21 | 2007-05-16 | Siemens Ag | Device for controlling an automatic transmission for a motor vehicle |
US5995036A (en) * | 1998-03-17 | 1999-11-30 | Sonic Innovations, Inc. | Passive switched capacitor delta analog-to-digital converter with programmable gain control |
EP1133898B1 (en) * | 1999-01-25 | 2002-08-28 | Widex A/S | Hearing aid system and hearing aid for in-situ fitting |
DE69906979T2 (en) * | 1999-02-05 | 2003-12-18 | Widex A/S, Vaerloese | HEARING AID WITH BEAM FORMING |
US6445321B2 (en) | 1999-04-05 | 2002-09-03 | Sonic Innovations, Inc. | Hybrid low-pass sigma-delta modulator |
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 |
US6313773B1 (en) | 2000-01-26 | 2001-11-06 | Sonic Innovations, Inc. | Multiplierless interpolator for a delta-sigma digital to analog converter |
ATE277490T1 (en) | 2000-07-05 | 2004-10-15 | Koninkl Philips Electronics Nv | A/D CONVERTER WITH INTEGRATED BIAS FOR MICROPHONE |
EP1251714B2 (en) | 2001-04-12 | 2015-06-03 | Sound Design Technologies Ltd. | Digital hearing aid system |
US6633202B2 (en) | 2001-04-12 | 2003-10-14 | Gennum Corporation | Precision low jitter oscillator circuit |
EP1251715B2 (en) | 2001-04-18 | 2010-12-01 | Sound Design Technologies Ltd. | Multi-channel hearing instrument with inter-channel communication |
US7076073B2 (en) * | 2001-04-18 | 2006-07-11 | Gennum Corporation | Digital quasi-RMS detector |
US20020191800A1 (en) * | 2001-04-19 | 2002-12-19 | Armstrong Stephen W. | In-situ transducer modeling in a digital hearing instrument |
DK1284587T3 (en) | 2001-08-15 | 2011-10-31 | Sound Design Technologies Ltd | Reconfigurable low energy hearing aid |
EP1428412B1 (en) * | 2001-09-21 | 2006-11-29 | Microsound A/S | Hearing aid with performance-optimized power consumption for variable clock, supply voltage and dsp processing parameters |
WO2003047309A1 (en) | 2001-11-30 | 2003-06-05 | Sonion A/S | A high efficiency driver for miniature loudspeakers |
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 (en) * | 2002-12-11 | 2004-06-16 | Dialog Semiconductor GmbH | Linearization of a PDM class-D amplifier |
DE102005006858A1 (en) | 2005-02-15 | 2006-09-07 | Siemens Audiologische Technik Gmbh | Hearing aid with an output amplifier comprising a sigma-delta modulator |
DK1920633T3 (en) * | 2005-08-23 | 2011-10-03 | Widex As | Hearing aid with increased acoustic bandwidth |
DK2417778T3 (en) | 2009-04-06 | 2015-07-27 | Widex As | Divided HEARING-AID WITH UNIT DATA CONNECTION |
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 (en) | 2010-03-09 | 2023-05-10 | T&W Engineering A/S | Two part eeg monitor with databus and method of communicating between the parts |
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 |
US10142743B2 (en) | 2016-01-01 | 2018-11-27 | Dean Robert Gary Anderson | Parametrically formulated noise and audio systems, devices, and methods thereof |
US11696083B2 (en) | 2020-10-21 | 2023-07-04 | Mh Acoustics, Llc | In-situ calibration of microphone arrays |
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 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3205685A1 (en) * | 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 (en) * | 1989-11-30 | 1992-07-22 | Nha As | PROGRAMMABLE HYBRID HEARING DEVICE WITH DIGITAL SIGNAL TREATMENT AND PROCEDURE FOR DETECTION AND SIGNAL TREATMENT AT THE SAME. |
DE69120924T2 (en) * | 1991-01-15 | 1997-01-30 | Ibm | Sigma-Delta converter |
US5448644A (en) * | 1992-06-29 | 1995-09-05 | Siemens Audiologische Technik Gmbh | Hearing aid |
EP0597523B1 (en) * | 1992-11-09 | 1997-07-23 | Koninklijke Philips Electronics N.V. | Digital-to-analog converter |
-
1994
- 1994-11-26 DE DE4441996A patent/DE4441996A1/en not_active Withdrawn
-
1995
- 1995-05-29 AU AU26714/95A patent/AU691001B2/en not_active Expired
- 1995-05-29 CA CA002204757A patent/CA2204757C/en not_active Expired - Lifetime
- 1995-05-29 EP EP95921771A patent/EP0793897B1/en not_active Expired - Lifetime
- 1995-05-29 AT AT95921771T patent/ATE166199T1/en not_active IP Right Cessation
- 1995-05-29 US US08/836,260 patent/US5878146A/en not_active Expired - Lifetime
- 1995-05-29 DE DE59502189T patent/DE59502189D1/en not_active Expired - Lifetime
- 1995-05-29 DK DK95921771T patent/DK0793897T3/en active
- 1995-05-29 WO PCT/EP1995/002033 patent/WO1996017493A1/en active IP Right Grant
- 1995-05-29 JP JP50832196A patent/JP3274469B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9617493A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019211187A1 (en) | 2018-04-30 | 2019-11-07 | Widex A/S | Method of operating a hearing aid system and a hearing aid system |
Also Published As
Publication number | Publication date |
---|---|
AU2671495A (en) | 1996-06-19 |
DK0793897T3 (en) | 1999-02-15 |
CA2204757C (en) | 1999-08-03 |
JP3274469B2 (en) | 2002-04-15 |
CA2204757A1 (en) | 1996-06-06 |
DE4441996A1 (en) | 1996-05-30 |
DE59502189D1 (en) | 1998-06-18 |
JPH10504155A (en) | 1998-04-14 |
AU691001B2 (en) | 1998-05-07 |
WO1996017493A1 (en) | 1996-06-06 |
EP0793897B1 (en) | 1998-05-13 |
ATE166199T1 (en) | 1998-05-15 |
US5878146A (en) | 1999-03-02 |
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