WO2001067805A2 - Commande automatique de mise en marche et d'arret d'un casque alimente par piles - Google Patents

Commande automatique de mise en marche et d'arret d'un casque alimente par piles Download PDF

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Publication number
WO2001067805A2
WO2001067805A2 PCT/US2001/006988 US0106988W WO0167805A2 WO 2001067805 A2 WO2001067805 A2 WO 2001067805A2 US 0106988 W US0106988 W US 0106988W WO 0167805 A2 WO0167805 A2 WO 0167805A2
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WO
WIPO (PCT)
Prior art keywords
headset
condition
sensing
active
earcup
Prior art date
Application number
PCT/US2001/006988
Other languages
English (en)
Inventor
Michael Wurtz
Original Assignee
Michael Wurtz
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/518,917 external-priority patent/US6704428B1/en
Application filed by Michael Wurtz filed Critical Michael Wurtz
Priority to AU40045/01A priority Critical patent/AU4004501A/en
Publication of WO2001067805A2 publication Critical patent/WO2001067805A2/fr

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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/06—Protective devices for the ears
    • A61F11/14—Protective devices for the ears external, e.g. earcaps or earmuffs
    • A61F11/145—Protective devices for the ears external, e.g. earcaps or earmuffs electric, e.g. for active noise reduction
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17855—Methods, e.g. algorithms; Devices for improving speed or power requirements
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1025—Accumulators or arrangements for charging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/03—Aspects of the reduction of energy consumption in hearing devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the present invention concerns headphones or headsets, particularly battery- powered headsets with automatic noise-reduction circuitry.
  • Headsets typically include two earcups which are worn over ears of users to enhance or protect their hearing. For example, many workers wear headsets to protect their hearing from loud persistent noises, such as airplane engines and construction equipment. These headsets are generally passive or active. Those that are passive only cover the ears with a sound-muffling material, whereas those that are active include ear speakers and automatic noise-reduction (ANR) circuitry. The noise-reduction circuitry automatically cancels or suppresses certain types of loud persistent noises. Active headsets are often battery-powered and include an on-off switch to turn them on and off.
  • the inventor devised active headsets with automatic turn-on and/or turn-off circuits and related mode-control methods for active headsets.
  • One exemplary embodiment senses a condition of the headsets, for example, the light, pressure, or temperature within one earcup, and then turns the headset on or off in response to the sensed condition
  • Other embodiments that include automatic noise- reduction (ANR) circuitry use an ANR d ⁇ ver to sense engagement of an earcup with a user's head and an ANR microphone to sense disengagement of the earcup from the user's head
  • Figure 1 is a block diagram of a first exemplary headset 100 incorporating the present invention
  • Figure 2 is a block diagram of a second exemplary headset 200 incorporating the present invention
  • Figure 3 is a schematic diagram of an exemplary turn-on circuit 300 incorporating the present invention
  • Figure 4 is a schematic diagram of an exemplary turn-off circuit 400 incorporating the present invention
  • Figure 5 is a schematic diagram of an exemplary power-supply circuit 500 for use with turn-on circuit 300 and/or turn-off circuit 400
  • Figure 6 is a schematic diagram of an exemplary headset 600 incorporating turn-off circuit 400 of Figure 4
  • Figure 1 shows a first exemplary embodiment of an active, automatic-noise- reduction (ANR) headset 100 incorporating an automatic mode control feature in accord with the present invention
  • Headset 100 includes an earcup 110 attached to a bridge member 1 12
  • Earcup 1 10 fits over an ear and against the head of a user, represented generally as a surface 111 m the Figure (For simplicity, the figure omits a second earcup )
  • Headset 100 also includes a mode sensor 120, and a mode- control circuit 130, an ANR sensor or microphone 140, ANR circuitry 150, and an ANR driver 160
  • ANR circuitry 150 includes one or more batte ⁇ es and a power supply which are not shown ) (In some embodiments, the ANR function is implemented digitally )
  • mode sensor 120 which is shown in broken form to emphasize that its placement can be virtually anywhere in or on the headset, senses a condition of earcup 1 10 (or more generally headset 100) and outputs a co ⁇ espondmg electrical signal to mode-control circuit 130
  • Mode-control circuit 130 processes the electrical signal, either switching the headset from a first operating mode to a second operating mode or leaving the headset in its current operating mode (or state ) For example, if the signal indicates that the earcup has been disengaged from the head of the user, mode-control circuit 130 deactivates ANR circuitry 150 or otherwise puts it in a standby mode to reduce power consumption
  • mode-control circuit 120 enables or activates ANR circuitry 140 to control or otherwise affect the perceived acoustic energy within earcup 1 10
  • ANR sensor 120 outputting an electrical signal representative of acoustic energy within earcup 110 to the ANR circuitry
  • the ANR circuitry processes the electrical signal and outputs a responsive electrical signal to ANR driver 140
  • ANR driver 140 ultimately produces an acoustic signal intended to cancel, suppress, or otherwise alter the acoustic energy within earcup 1 10
  • mode sensor 120 comp ⁇ ses one or more mechanical switches, photo-sensors, temperature sensors, or pressure sensors
  • light or photoelectric sensor includes any elect ⁇ cal or electromechanical device or component with useful photon-sensitive characte ⁇ stics that is coupled for use as a sensor
  • Temperature sensor includes any elect ⁇ cal device or component with useful temperature-dependent characte ⁇ stics that is coupled for use as a sensor
  • Pressure sensor includes any electrical or electromechanical device or component with useful pressure-dependent characteristics that is coupled for use as a sensor
  • a normally open or normally closed mechanical switch closes or opens on sufficient deflection of at least a portion of the earcup, such as an ear cushion, or deflection of a b ⁇ dge between two earcups, upon engagement or disengagement of the headset with the head of the user (head surface or more generally user surface) Engagement or disengagement makes or breaks a normally open or normally closed elect ⁇ cal contact which in turn operates a switch (not shown) between a power supply and the A
  • FIG. 2 shows a second exemplary embodiment of an ANR headset 200 including an automatic mode control feature in accord with the invention ( Figure 2 omits earcups for clarity )
  • Headset 200 includes an ANR microphone 140, an ANR circuitry 150, an ANR driver 160, and implements automatic mode control using a turn-off circuit 130a, a turn-off circuit 130b, and a power switch 130c
  • Turn-off circuit 130a is responsive to signals from ANR microphone 140 to control power switch 130c
  • turn-on circuit 130b is responsive to signals from ANR d ⁇ ver 160 to control the power switch
  • headset 200 omits a dedicated mode sensor, and instead uses ANR d ⁇ ver 160 and microphone 130 as respective headset engagement and headset disengagement sensors
  • engaging earcup 1 10 with the head of a user generally results m an appreciable mechanical deflection of ANR driver 150, which responsively outputs an appreciable electrical signal to turn-on circuitry 130a If the signal exceeds a threshold, turn-on circuitry 130a activates power switch 130c, thereby providing power to ANR circuitry 150
  • the earcup and surface 11 1 define a substantially closed volume that changes with user movements, such as head and jaw movements and the pulsating flow of blood through the confronting surface.
  • these volume changes cause momentary pressure changes within the earcup, which are generally inaudible low-frequency events correlated only to engagement of the earcup with surface 1 1 1.
  • microphone 130 produces a low-frequency electrical signal which turn-off circuitry 130b monitors. If the turn-off circuitry detects that this signal is absent for a sufficient period of time, such as 2 or 3 or 5 or more minutes, it deactivates power switch 130c.
  • FIG. 3 shows details of an exemplary embodiment of turn-on circuit 130a.
  • the turn-on circuit includes a high-pass filter 310, a preamplifier 320, threshold detector 330, an inverter 340, a processor 350, a switch 360, power supply terminals V+ and Vgnd, and a positive battery te ⁇ ninal Vbattery+.
  • V+ and Vgnd are respectively +2.5 and zero volts in the exemplary embodiment.
  • one or more batteries for example, AA batteries, and a switching regulator which provides the voltages of +2.5 and - 2.5 volts.
  • turn-on circuitry draws on the order of 10 microamps from one or more supplied batteries. Hence, its impact on battery life is generally negligible.
  • filter 310 comprises a 100-nanofarad capacitor C4k and a resistor R6k.
  • Capacitor C4k has first and second terminals, with the first terminal coupled to the output of the ANR circuitry, or more precisely the ANR driver.
  • the second terminal of capacitor C4k is coupled to ground via resistor R6k and to the input of preamplifier 320.
  • Preamplifier 320 comprises an LT1495 operational amplifier Ula, a one- mega-ohm resistor R6k, a 33 kilo-ohm resistor R7k , a 470-kilo-ohm resistor R15a, and 100-kilo-ohm input resistor R16a.
  • Amplifier Ula has a negative and positive inputs and an output. The positive input is coupled via resistor R16a to a second terminal of capacitor C4k, and the negative input is coupled to terminal Vgnd via resistor R7k. Resistor R6k is coupled between the second terminal of capacitor C4k and ground, and resistor Rl 5a is coupled between the output and the negative input of amplifier Ula.
  • Detector 330 which detects signals swings greater than 50 millivolts, includes an LT 1495 operational amplifier U lb, a 1 N914 diode D 1 , and a one-mega- ohm resistor R8k Amplifier Ulb has a positive input coupled to the output of amplifier Ula, and a negative input coupled to the positive terminal of diode Dl The negative terminal of diode Dl is coupled to ground, and resistor R8k is coupled between the positive terminal of diode D 1 and positive supply terminal V+ Inverter 340 has its input coupled to the output of amplifier Ulb, and its output coupled to an input of processor 350
  • Processor 350 responds to an output signal indicating engagement of the headset with the user by activating switch 360 Activating switch 360, which m this embodiments comp ⁇ ses a p-channel mosfet transistor, connects power to the ANR circuitry enabling it to cancel or otherwise alter the acoustic energy withm the earcup A terminal of the mosfet is coupled to a shutdown pm of an integrated switching regulator
  • Figure 4 shows an exemplary embodiment of turn-off circuit 130b
  • Turn-off circuit 130b includes a microphone preamplifier 410, a bandpass filter 420, a threshold detector 430, a processor 450, a switch 460, respective positive and negative power-supply terminals V+ and V-, and a positive battery terminal (or node) Vbattery+
  • terminals V+ and V- respectively provide 2 5 and -2 5 volts
  • ANR microphone 140 senses pressure withm earcup 120 When engaged with each other earcup 110 and surface 1 1 1 defines a substantially closed space with a volume that changes with user movements, such as head and jaw movements and the pulsating flow of blood through surface 11 1 In turn, these volume changes cause momentary pressure changes withm the earcup, which are generally inaudible, low-frequency events
  • microphone 140 generally provides preamplifier 410 a signal with low-frequency content that changes during engagement of earcup 110 with surface 130 and that remains relatively constant after disengagement More particularly, preamplifier 410 has a gam of 20 decibels and comprises an input capacitor C 10a of 470 nano farads, an input resistor Rl 0a of 470 kilo-ohms, an LMV324 operational amplifier Uld, and feedback resistors R12a of 6 8 kilo-
  • Band-pass filter 420 which defines a one-to-five hertz passband with an approximate gam of 30 decibels, comprises a resistor Rlk of 330 kilo-ohms, a resistor R2k of 330 kilo-ohms, a resistor R3k of 33 kilo-ohms, a resistor R4k of 1 kilo-ohm, a resistor R5k of 620 kilo-ohms, and a resistor Rim of 470 kilo-ohms
  • Filter 18 also comprises three 100-nanofarad capacitors C Ik, C2k, and C3k, and one 470-nanofarad capacitor Clm
  • Filter 180 also comprises an operational amplifier U5b which provides a pressure signal indicativ e of the pressure in earcup 120 via capacitor Clm to threshold detector 430
  • Threshold detector 430 which comp ⁇ ses an LMV324 operational amplifier, a 470-k ⁇ lo-ohm resistor R2m, a 1 -kiloohm resistor R3m, and a 10-k ⁇ lo-ohm resistor R4m, compares the pressure signal to a 225-m ⁇ lhvolt reference voltage at a node C and outputs a signal indicating the result of the comparison to processor 440 When the pressure signal at node B is greater than the reference voltage at node C, detector 430 outputs a low signal, which indicates an "on-head" event, that is, engagement of earcup 110 with surface 1 10, to processor 440
  • processor 440 In response to receiving an "on-head” event, processor 440 starts a timer which runs for a predetermined penod of time, for example, two to three minutes If du ⁇ ng this pe ⁇ od, another "on-head" event does not occur, that is, there are no sensed low- frequency events of sufficient magnitude, processor 440 assumes that the headset has been removed and sends an approp ⁇ ate turn-off signal to a power- supply shutdown circuit, which turns off the headset In some embodiments, processor 440 directly drives a shut-down pm on a switching regulator that provides the V+ and V- supply voltages
  • Figures 3 and 4 are shown as separate stand-alone circuits which are adaptable to virtually any active ANR headset to provide automatic mode control When used together in the same headset, certain components of the circuits are shared preferably to reduce the number of parts For example, some embodiments use a single programmable processor and power switch Moreover, some embodiments implement all or one or more portions of the circuit as an integrated circuit
  • FIG. 5 shows an exemplary embodiment of a power supply 500
  • Supply 500 includes, among other things, battery connection terminals 510a and 510b, one or moie batteries 520, and an integrated switching regulator circuit 530
  • Regulator circuit 530 includes a shutdown pm which m the exemplary embodiment, is ultimately coupled to a terminal of itch 360 or switch 460 m the turn-on and turn-off circuits of Figures 3 and 4
  • the present inv ention is not limited to any particular power supply arrangement
  • Figure 6 shows an exemplary embodiment of active headset 600 including a turn-off circuit in accord with the ention Figure 6 also shows details of an exemplary ANR circuitry
  • One exemplary embodiment provides an turn-on and turn-off circuits which automatically detect engagement and disengagement of a headset to or from the head of a user to activate or deact ⁇ ate the headset
  • the turn-off circuit is especially useful to conserv e battery life m battery-powered ANR headsets
  • the invention is general! applicable to automatically control the operational mode of any active headsets or headphones, regardless of the power source

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Signal Processing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Psychology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Otolaryngology (AREA)
  • Biophysics (AREA)
  • Headphones And Earphones (AREA)

Abstract

Certains ouvriers portent des casques pour protéger l'ouïe contre des bruits intenses et persistants tels que les moteurs d'avions ou les machines de chantier. Ces casques sont en règle générale passifs ou actifs; les casques actifs comprennent des écouteurs et un circuit automatique de réduction de bruit destiné à supprimer ou atténuer certains types de bruits intenses et persistants. Un des problèmes liés aux casques actifs (notamment ceux alimentés par batterie) concerne la durée de vie des piles. Souvent, les ouvriers enlèvent le casque ou le posent sans l'éteindre, ce qui diminue la durée de vie des piles. De ce fait, l'inventeur a développé des casques actifs avec des circuits automatiques d'allumage et de mise hors tension. Dans un mode de réalisation d'exemple, un état en rapport avec le casque est détecté tel que la lumière, la pression ou la température dans un des protège-oreille, et le casque est mis hors tension en réponse à l'état détecté.
PCT/US2001/006988 2000-03-06 2001-03-06 Commande automatique de mise en marche et d'arret d'un casque alimente par piles WO2001067805A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40045/01A AU4004501A (en) 2000-03-06 2001-03-06 Automatic turn-on and turn-off control for battery-powered headsets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/518,917 US6704428B1 (en) 1999-03-05 2000-03-06 Automatic turn-on and turn-off control for battery-powered headsets
US09/518,917 2000-03-06

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Publication Number Publication Date
WO2001067805A2 true WO2001067805A2 (fr) 2001-09-13

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Cited By (9)

* Cited by examiner, † Cited by third party
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WO2005099301A1 (fr) * 2004-04-05 2005-10-20 Koninklijke Philips Electronics N.V. Systeme, dispositif et procede et programme informatique de divertissement audio
WO2006003618A1 (fr) * 2004-06-30 2006-01-12 Koninklijke Philips Electronics N.V. Circuit agence pour l'annulation active de bruit et procede d'annulation active de bruit
EP1499017A3 (fr) * 2003-07-15 2006-03-29 Bose Corporation Dispositif d'alimentation électrique
US7888907B2 (en) 2007-10-30 2011-02-15 Bose Corporation Controlled charging and use of power source
WO2013050804A1 (fr) * 2011-10-05 2013-04-11 Nokia Corporation Mouvement d'enregistrement d'un appareil de casque d'écoute dans le boîtier
CN103179485A (zh) * 2013-03-28 2013-06-26 歌尔声学股份有限公司 一种有源折叠式耳机以及其开关机方法和装置
CN103347232A (zh) * 2013-07-25 2013-10-09 青岛歌尔声学科技有限公司 一种双模耳机电路及音频输出方法
EP2704451A1 (fr) * 2012-08-30 2014-03-05 Monster LLC Casque de réglage automatique de la consommation d'énergie
CN108780639A (zh) * 2015-12-18 2018-11-09 伯斯有限公司 具有轻敲控制的声学噪声降低音频系统

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1499017A3 (fr) * 2003-07-15 2006-03-29 Bose Corporation Dispositif d'alimentation électrique
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CN108780639B (zh) * 2015-12-18 2023-08-15 伯斯有限公司 具有轻敲控制的声学噪声降低音频系统

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