US3385937A - Hearing aids - Google Patents

Hearing aids Download PDF

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Publication number
US3385937A
US3385937A US341004A US34100464A US3385937A US 3385937 A US3385937 A US 3385937A US 341004 A US341004 A US 341004A US 34100464 A US34100464 A US 34100464A US 3385937 A US3385937 A US 3385937A
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cycles per
signals
output
frequency
ranging
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US341004A
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English (en)
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Jean-Claude Lafon
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Centre National de la Recherche Scientifique CNRS
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Centre National de la Recherche Scientifique CNRS
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    • 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
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/353—Frequency, e.g. frequency shift or compression

Definitions

  • An auditory prothesis device comprising a microphone, two band-pass filters connected to the output of said microphone for passing, respectively, frequencies ranging, on the one hand, from 1500 to 3500 c.p.s. and, on the other hand, from a lower limit ranging from 4500 to 6000 c.p.s.
  • means for detecting the amplitude of the signals passed through each of said filter means means for detecting the amplitude of the signals passed through each of said filter means, two oscillators for producing each a distinct alternating voltage of a frequency ranging from 350 to 1000 c.p.s., a modulator for modulating the voltage supplied by each of said oscillators in accordance with the output of each of said detecting means, respectively, means for mixing the modulated voltages supplied by said two modulators, an amplifier connected to the output of said microphone in shunt with said band-pass filters, a mixer having two inputs connected respectively with the output of said amplifier and with the output of said mixing means and an earphone having its input connected with the output of said mixer.
  • the present invention relates to hearing aids or auditory prosthesis devices.
  • the chief object of the present invention is to provide a device of this kind which is better adapted to meet the requirements of practice, in particular which permits of making the sounds of a speech more intelligible to a deaf person.
  • such a device comprises, in combination, a microphone for transforming acoustic signals into electric signals, two band-pass filter means for passing only the electric signals delivered by said microphone the frequencies of which range substantially on the one hand from 1500 to 3500 cycle per second and on the other hand from a lower limit ranging from 4500 to 6000 cycles per second to an upper limit ranging from 7000 to 8000 cycles per second, respectively, amplitude detecting means for detecting the envelope of the signals passed through said filter means, compensating means for producing an alternating voltage of a frequency ranging from 350 to 1000 cycles per second, means for modulating the voltage supplied by said compensating means in accordance with the output of said detecting means, means for amplifying the modulated voltage supplied by said modulating means, and an earphone for transforming the voltage thus amplified into acoustic signals.
  • the hearing aid device further comprises, between the microphone and the earphone, filter means for passing only the electric signals from the microphone having a frequency below 1000 cycles per second and means having their out ut connected with the last mentioned filter means for transmitting the signals therefrom to the earphone.
  • a third feature according to my invention consists in providing two separate chains respectively for the signals ranging from 1500 to 3500 cycles per second and for 3,385,937 Patented May 28, 1968 these ranging from 4500 (or 6000) cycles per second to 7000 (or 8000) cycles per second, each of these chains comprising a filter, an amplitude detector and a modulator for mixing the detected signals with a compensating reciprocating voltage of a frequency chosen within the range from 350 to 1000 cycles per second, the compensating frequencies being different for said two chains respectively.
  • FIG. 1 is a diagram illustrating the principle of my invention
  • FIG. 2 is a diagrammatical view of a hearing aid device made according to a first embodiment of the invention
  • FIG. 3 is a view similar to FIG. 2 relating to another embodiment of the invention.
  • the ire quency band chosen for the low-pitched sound was lower than 300 cycles per second so as to correspond to the frequency band best audible for deaf persons and possibly to provide several harmonics and on the other hand, the filtered sounds were distributed over the whole partial band in question.
  • the first of these features practically prevents the deaf person from distinguishing the loud sounding consonants from muffled consonants and the second of said features has for its effect to produce multiple signals a great number of which is unnecessary and prevents a good understanding of the message that has been formed, while complicating the apparatus.
  • the information portions of speech having frequencies ranging on the one hand from 1500 to 3500 cycles per second and on the other hand from 45006000 to 7000-8000 cycles per second by replacing them by at least one low-pitched sound of constant frequency ranging from 350 to 1000 cycles per second modulated by the curve forming the envelope of the amplitudes of said portions of speech.
  • This transposed low-pitched sound preferably is a pure sinusoidal sound but it might also be of any other desired nature, for instance an aleatory noise, either filtered or not.
  • Its frequency may be chosen as low as 400 cycles per second in apparatus to be used for deaf persons which do not perceive any sound having a frequency exceeding 500 cycles per second. However preferably its frequency is chosen in the range from 800 to 1000 cycles per second.
  • FIG. 1 The principle of the invention is diagrammatically illustrated by FIG. 1, where the frequencies are plotted in abscissas and the amplitudes in ordinates.
  • the curves A and B are the curves of response of the band-pass filters corresponding respectively to the frequency bands of from 1500 to 3500 cycles per second and from 6000 to 7500 cycles per second.
  • the dot-anddash lines indicate the transposition of the filtered sounds from these frequency hands into a compensation sound C the constant frequency of which is within frequency band D ranging from 350 to 1000 cycles per second.
  • FIG. 1 further shows at M the response curve of another bandpass filter corresponding to the frequency band ranging from 4500 to 7500 cycles per second, this filter being used instead of that corresponding to the frequency band from 6000 to 7500 cycles per second if it is desired to take phoneme y into account as above stated.
  • FIG. 2 shows a first embodiment of the invention.
  • a microphone 1 transforming the acoustic signals it receives, produced by human speech, into electric signals
  • Two band-pass filters 3 and 3 adapted to pass among the preamplified signals, only those corresponding respectively to frequencies ranging from 1500 to 3500 cycles per second for 3 and from 4500 (or 6000) to 7000 (or 8000) cycles per second, for 3 System 4 for amplifying and detecting or demodulating the signals filtered by 3 and 3 which may include a conventional amplitude or envelope detector that develops a varying D C. signal which follows the envelope of the input signal components,
  • a source 5 capable of producing a sinusoidal voltage of constant frequency ranging from 350 to 1000 cycles per second (preferably from 800 to 1000 cycles per second) if the deaf person for which the apparatus is intended is capable of perceiving sounds corresponding to this 800l000 band,
  • An adjustable gain amplifier 6 energized both by the output of detecting system 4 and by the sinusodial voltage from source 5, so as to have said voltage modulated by the curve forming the envelope of the two portions filtered at 3 and 3 of the speech received at 1,
  • An earphone 8 capable of transforming the electric signals at the output of amplifier 7 into acoustic signals fed to the ear or cars of the deaf person.
  • the low frequency portion of the speech, which can be heard by said person may be directly received by him after amplification.
  • I connect with the output of preamplifier 2 a low-pass filter 9, for instance the cutoff frequency of which is 1000 cycles per second and the output of this filter 9 is mixed (summed) with that of the adjustable gain amplifier 6 in a mixer (summation device) 10 the output of which is connected to the input of amplifier 7.
  • a mixer summation device 10 the output of which is connected to the input of amplifier 7.
  • FIG. 3 shows another embodiment of the invention.
  • This second embodiment differs from the first one merely in that it uses two compensation signals instead of a single one.
  • Source 5 is therefore replaced by two distinct sources 5 and 5 each producing a sinusoidal voltage the constant frequency of which ranges between 350 and 1000 cycles per scond, the frequencies of said sources 5 and 5 being different from each other.
  • the amplifying and envelope detecting system 4 of the first embodiment is in this second embodiment replaced by two systems 4 and 4 respectively, each of which treats one of the signals issuing from filter 3 and filter 3 respectively.
  • the outputs of said systems 4 and 4 are applied to two adjustable gain amplifiers 6 and 6 further energized by voltages supplied by 5 and 5 respectively.
  • the modulated signals obtained at the outputs of amplifiers 6 and 6 are mixed (added) together at 11 before being further mixed (added) with the signals coming from filter 9.
  • a hearing aid device which comprises, in combination, a microphone for transforming acoustic signals into electric signals, two band-pass filter means having their respective inputs connected with the output of said microphone for passing the electric signals delivered by said microphone within two frequency bands, respectively, one of said frequency bands ranging substantially from 1500 to 3500 cycles per second and the other of said frequency bands having its lower limit within the range of 4500 to 6000 cycles per second and its upper limit within the range of 7000 to 8000 cycles per second, means having the input thereof connected with the output of said filter means for detecting the amplitude of the signals passed through said filter means, compensating means for producing an alternating voltage of a fixed frequency of a value ranging from 350 to 1000 cycles per second, means having the input thereof connected both to the output of said compensating means and to the output of said detecting means for amplitude modulating the voltage supplied by said compensating means in accordance with the output of said detecting means, means connected to the output of said modulating means for amplifying the modulated voltage supplied by said modulating means, and an earphone connected
  • a hearing aid device which comprises, in combination, a microphone for transforming acoustic signals into electric signals, two band-pass filter means having their respective inputs connected with the output of said microphone for passing the electric signals delivered by said microphone within two frequency bands, respectively, one of said frequency bands ranging substantially from 1500 to 3500 cycles per second and the other of said frequency bands having its lower limit within the ran e of 4500 to 6000 cycles per second and its upper limit within the range of 7000 to 8000 cycles per second, two amplitude detecting means having each the input thereof connected with the output of one of said filter means, respectively, for detecting the amplitude of the signals passed therethrough, two compensating means, each for producing an alternating voltage of a frequency of a value ranging from 350 to 1000 cycles per second, the frequencies of the voltages delivered by said respective compensating means being different from each other, two means having each two inputs connected to the output of one of said compensating means and to the output of one of said detecting means respectively, for modulating the voltages supplied by said compensating means in accordance with the
  • a hearing aid device further including low-pass filter means coupled between said microphone and said earphone for passing from said rnicrophone to said earphone only signals of a frequency below approximately 1000 cycles per second.
  • a hearing aid device further comprising a mixer having its output connected with said earphone, said mixer having two inputs, one connected with the output of said low-pass filter means and the other connected with the output of said modulating means.
  • a hearing aid device further including, by-pass filter means inserted between said microphone and said earphone for passing from said microphone to said earphone only signals of a frequency below approximately 1000 cycles per second.
  • a hearing aid device further comprising a mixer having its output connected with said earphone, said mixer having two inputs, one connected with the output of said low-pass filter means and the other connected with the output of said mixing means.
  • a hearing aid device comprising transducer means for producing electrical signals corresponding to received information bearing audio signals, reproducing means receiving the transducer signals for separating electric signals in the range of 1500 to 3500 and 4500 to 8000 cycles per second and developing two signals each with a characterisic which varies according to the information content of opposite ones of said ranges of signals and varying each of at least one fixed frequency carrier signal in accordance with said characteristics variations of said two signals respectively and another transducing means producing audible signals at the frequency of the at least. one carrier frequency and said audible signals varying according to the information of the electric signals in said ranges.

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  • 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)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)
US341004A 1963-02-14 1964-01-29 Hearing aids Expired - Lifetime US3385937A (en)

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FR924885 1963-02-14

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US (1) US3385937A (de)
BE (1) BE643118A (de)
CH (1) CH398700A (de)
DE (1) DE1261169B (de)
DK (1) DK135140B (de)
GB (1) GB1057771A (de)
NL (1) NL6401211A (de)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531595A (en) * 1966-10-31 1970-09-29 Michael S Demaree Method and apparatus for the testing and treatment of hearing deficiencies
US3562428A (en) * 1966-10-10 1971-02-09 Emi Ltd Arrangements for use in the examination of sound wave patterns
US3600524A (en) * 1967-12-28 1971-08-17 Emanuele Biondi Hearing aid using multiple frequency translation
US3819875A (en) * 1971-06-08 1974-06-25 Nat Res Dev Aids for deaf persons
DE2303194A1 (de) * 1973-01-23 1974-07-25 Micro Technic Hueber & Co Hoerhilfsgeraet fuer schwerhoerige oder hoerbehinderte
USB354145I5 (de) * 1972-10-16 1975-01-28
US4051331A (en) * 1976-03-29 1977-09-27 Brigham Young University Speech coding hearing aid system utilizing formant frequency transformation
US4188667A (en) * 1976-02-23 1980-02-12 Beex Aloysius A ARMA filter and method for designing the same
DE2844979A1 (de) * 1978-10-16 1980-04-17 Mantel Juval Hoergeraet
US4220160A (en) * 1978-07-05 1980-09-02 Clinical Systems Associates, Inc. Method and apparatus for discrimination and detection of heart sounds
DE2908999A1 (de) * 1979-03-08 1980-09-18 Siemens Ag Verfahren zur erzeugung von akustischen sprachsignalen, die fuer aeusserst schwerhoerige verstaendlich sind und geraet zur durchfuehrung dieses verfahrens
DE3016128A1 (de) * 1979-03-08 1981-11-05 Siemens AG, 1000 Berlin und 8000 München Verfahren zur erzeugung von akustischen sprachsignalen, die fuer aeusserst schwerhoerige verstaendlich sind (optimale sprachverstaendlichkeit liefern) und geraet zur durchfuehrung dieses verfahrens
US4366349A (en) * 1980-04-28 1982-12-28 Adelman Roger A Generalized signal processing hearing aid
US4393275A (en) * 1981-09-30 1983-07-12 Beltone Electronics Corporation Hearing aid with controllable wide range of frequency response
US4403118A (en) * 1980-04-25 1983-09-06 Siemens Aktiengesellschaft Method for generating acoustical speech signals which can be understood by persons extremely hard of hearing and a device for the implementation of said method
US4419544A (en) * 1982-04-26 1983-12-06 Adelman Roger A Signal processing apparatus
US4611596A (en) * 1980-10-14 1986-09-16 Purdue Research Foundation Sensory prostheses
US4628907A (en) * 1984-03-22 1986-12-16 Epley John M Direct contact hearing aid apparatus
US4843623A (en) * 1986-05-23 1989-06-27 University De Franche-Comte Hearing aid devices in which high frequency signal portions are transposed in low frequency compenstion signal portions
US5303306A (en) * 1989-06-06 1994-04-12 Audioscience, Inc. Hearing aid with programmable remote and method of deriving settings for configuring the hearing aid
US5844984A (en) * 1992-03-19 1998-12-01 Pan Communications, Inc. Two-way communications earset with filter
WO1999014986A1 (en) * 1997-09-19 1999-03-25 University Of Iowa Research Foundation Hearing aid with proportional frequency compression and shifting of audio signals
US6272360B1 (en) 1997-07-03 2001-08-07 Pan Communications, Inc. Remotely installed transmitter and a hands-free two-way voice terminal device using same
US20070009130A1 (en) * 2001-08-10 2007-01-11 Clear-Tone Hearing Aid BTE/CIC auditory device and modular connector system therefor
US20070064966A1 (en) * 2001-08-10 2007-03-22 Hear-Wear Technologies, Llc BTE/CIC auditory device and modular connector system therefor
US20080123886A1 (en) * 2005-06-27 2008-05-29 Widex A/S Hearing aid with enhanced high frequency reproduction and method for processing an audio signal
US20130121517A1 (en) * 2011-11-16 2013-05-16 Dean Robert Gary Anderson As Trustee Of The D/L Anderson Family Trust Method and apparatus for adding audible noise with time varying volume to audio devices
US20130182875A1 (en) * 2010-12-08 2013-07-18 Widex A/S Hearing aid and a method of improved audio reproduction
US8855342B2 (en) 2010-09-29 2014-10-07 Siemens Medical Instruments Pte. Ltd. Hearing aid device for frequency compression
US8908892B2 (en) 2010-09-29 2014-12-09 Siemens Medical Instruments Pte. Ltd. Method and device for frequency compression in a hearing aid
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
US9491559B2 (en) 2009-06-09 2016-11-08 Dean Robert Gary Anderson As Trustee Of The D/L Anderson Family Trust Method and apparatus for directional acoustic fitting of hearing aids
US20170195803A1 (en) * 2016-01-01 2017-07-06 Dean Robert Gary Anderson Audio systems, devices, and methods

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1537596B1 (de) * 1967-11-14 1970-09-03 Michel Copel Verfahren und Schaltungsanordnung zum Verbessern der Verstaendlichkeit frequenzverzerrter Sprache
DE2316939B2 (de) * 1973-04-04 1978-06-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektrische Hörhilfeschaltung
DE3333776A1 (de) * 1983-09-19 1985-04-18 Siemens AG, 1000 Berlin und 8000 München Verfahren und vorrichtung zur uebertragung akustischer informationen als fuehlbare vibrationen
IL70153A0 (en) * 1983-11-07 1984-02-29 Navot Technology Ltd Audiotactile communication system
DE3782959T2 (de) * 1986-04-01 1993-06-24 Matsushita Electric Ind Co Ltd Erzeuger von niederfrequenten toenen.
DE102010041640B4 (de) * 2010-09-29 2014-01-30 Siemens Medical Instruments Pte. Ltd. Hörhilfegerät zur Frequenzkompression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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None *

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562428A (en) * 1966-10-10 1971-02-09 Emi Ltd Arrangements for use in the examination of sound wave patterns
US3531595A (en) * 1966-10-31 1970-09-29 Michael S Demaree Method and apparatus for the testing and treatment of hearing deficiencies
US3600524A (en) * 1967-12-28 1971-08-17 Emanuele Biondi Hearing aid using multiple frequency translation
US3819875A (en) * 1971-06-08 1974-06-25 Nat Res Dev Aids for deaf persons
USB354145I5 (de) * 1972-10-16 1975-01-28
US3927279A (en) * 1972-10-16 1975-12-16 Rion Co Hearing aid
DE2303194A1 (de) * 1973-01-23 1974-07-25 Micro Technic Hueber & Co Hoerhilfsgeraet fuer schwerhoerige oder hoerbehinderte
US4188667A (en) * 1976-02-23 1980-02-12 Beex Aloysius A ARMA filter and method for designing the same
US4051331A (en) * 1976-03-29 1977-09-27 Brigham Young University Speech coding hearing aid system utilizing formant frequency transformation
US4220160A (en) * 1978-07-05 1980-09-02 Clinical Systems Associates, Inc. Method and apparatus for discrimination and detection of heart sounds
DE2844979A1 (de) * 1978-10-16 1980-04-17 Mantel Juval Hoergeraet
US4289935A (en) * 1979-03-08 1981-09-15 Siemens Aktiengesellschaft Method for generating acoustical voice signals for persons extremely hard of hearing and a device for implementing this method
DE3016128A1 (de) * 1979-03-08 1981-11-05 Siemens AG, 1000 Berlin und 8000 München Verfahren zur erzeugung von akustischen sprachsignalen, die fuer aeusserst schwerhoerige verstaendlich sind (optimale sprachverstaendlichkeit liefern) und geraet zur durchfuehrung dieses verfahrens
DE2908999A1 (de) * 1979-03-08 1980-09-18 Siemens Ag Verfahren zur erzeugung von akustischen sprachsignalen, die fuer aeusserst schwerhoerige verstaendlich sind und geraet zur durchfuehrung dieses verfahrens
US4403118A (en) * 1980-04-25 1983-09-06 Siemens Aktiengesellschaft Method for generating acoustical speech signals which can be understood by persons extremely hard of hearing and a device for the implementation of said method
US4366349A (en) * 1980-04-28 1982-12-28 Adelman Roger A Generalized signal processing hearing aid
US4611596A (en) * 1980-10-14 1986-09-16 Purdue Research Foundation Sensory prostheses
US4393275A (en) * 1981-09-30 1983-07-12 Beltone Electronics Corporation Hearing aid with controllable wide range of frequency response
US4419544A (en) * 1982-04-26 1983-12-06 Adelman Roger A Signal processing apparatus
US4628907A (en) * 1984-03-22 1986-12-16 Epley John M Direct contact hearing aid apparatus
US4843623A (en) * 1986-05-23 1989-06-27 University De Franche-Comte Hearing aid devices in which high frequency signal portions are transposed in low frequency compenstion signal portions
US5303306A (en) * 1989-06-06 1994-04-12 Audioscience, Inc. Hearing aid with programmable remote and method of deriving settings for configuring the hearing aid
US5844984A (en) * 1992-03-19 1998-12-01 Pan Communications, Inc. Two-way communications earset with filter
US6272360B1 (en) 1997-07-03 2001-08-07 Pan Communications, Inc. Remotely installed transmitter and a hands-free two-way voice terminal device using same
WO1999014986A1 (en) * 1997-09-19 1999-03-25 University Of Iowa Research Foundation Hearing aid with proportional frequency compression and shifting of audio signals
US6577739B1 (en) 1997-09-19 2003-06-10 University Of Iowa Research Foundation Apparatus and methods for proportional audio compression and frequency shifting
US20070009130A1 (en) * 2001-08-10 2007-01-11 Clear-Tone Hearing Aid BTE/CIC auditory device and modular connector system therefor
US9591393B2 (en) 2001-08-10 2017-03-07 Hear-Wear Technologies, Llc BTE/CIC auditory device and modular connector system therefor
US8976991B2 (en) 2001-08-10 2015-03-10 Hear-Wear Technologies, Llc BTE/CIC auditory device and modular connector system therefor
US7606382B2 (en) 2001-08-10 2009-10-20 Hear-Wear Technologies LLC BTE/CIC auditory device and modular connector system therefor
US20090296969A1 (en) * 2001-08-10 2009-12-03 Hear-Wear Technologies, Llc Bte/cic auditory device and modular connector system therefor
US20100226520A1 (en) * 2001-08-10 2010-09-09 Hear-Wear Technologies, Llc BTE/CIC Auditory Device and Modular Connector System Therefor
US20070064966A1 (en) * 2001-08-10 2007-03-22 Hear-Wear Technologies, Llc BTE/CIC auditory device and modular connector system therefor
US8050437B2 (en) 2001-08-10 2011-11-01 Hear-Wear Technologies, Llc BTE/CIC auditory device and modular connector system therefor
US8094850B2 (en) 2001-08-10 2012-01-10 Hear-Wear Technologies, Llc BTE/CIC auditory device and modular connector system therefor
US8031892B2 (en) * 2005-06-27 2011-10-04 Widex A/S Hearing aid with enhanced high frequency reproduction and method for processing an audio signal
US20080123886A1 (en) * 2005-06-27 2008-05-29 Widex A/S Hearing aid with enhanced high frequency reproduction and method for processing an audio signal
US9491559B2 (en) 2009-06-09 2016-11-08 Dean Robert Gary Anderson As Trustee Of The D/L Anderson Family Trust Method and apparatus for directional acoustic fitting of hearing aids
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
US8855342B2 (en) 2010-09-29 2014-10-07 Siemens Medical Instruments Pte. Ltd. Hearing aid device for frequency compression
US8908892B2 (en) 2010-09-29 2014-12-09 Siemens Medical Instruments Pte. Ltd. Method and device for frequency compression in a hearing aid
US20130182875A1 (en) * 2010-12-08 2013-07-18 Widex A/S Hearing aid and a method of improved audio reproduction
US9111549B2 (en) * 2010-12-08 2015-08-18 Widex A/S Hearing aid and a method of improved audio reproduction
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
US20130121517A1 (en) * 2011-11-16 2013-05-16 Dean Robert Gary Anderson As Trustee Of The D/L Anderson Family Trust Method and apparatus for adding audible noise with time varying volume to audio devices
US20170195803A1 (en) * 2016-01-01 2017-07-06 Dean Robert Gary Anderson Audio systems, devices, and methods
US20170195800A1 (en) * 2016-01-01 2017-07-06 Dean Robert Gary Anderson Parametrically formulated noise and audio systems, devices, and methods thereof
US10142743B2 (en) * 2016-01-01 2018-11-27 Dean Robert Gary Anderson Parametrically formulated noise and audio systems, devices, and methods thereof
US10142742B2 (en) * 2016-01-01 2018-11-27 Dean Robert Gary Anderson Audio systems, devices, and methods
US20190191253A1 (en) * 2016-01-01 2019-06-20 Dean Robert Gary Anderson Audio systems, devices, and methods
US10798495B2 (en) 2016-01-01 2020-10-06 Dean Robert Gary Anderson Parametrically formulated noise and audio systems, devices, and methods thereof
US10805741B2 (en) * 2016-01-01 2020-10-13 Dean Robert Gary Anderson Audio systems, devices, and methods

Also Published As

Publication number Publication date
NL6401211A (de) 1964-08-17
DK135140C (de) 1977-08-08
CH398700A (fr) 1966-03-15
GB1057771A (en) 1967-02-08
DE1261169B (de) 1968-02-15
BE643118A (de) 1964-05-15
DK135140B (da) 1977-03-07

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