EP3326171B1 - Dispositif de controle actif de bruit - Google Patents

Dispositif de controle actif de bruit Download PDF

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Publication number
EP3326171B1
EP3326171B1 EP16753589.7A EP16753589A EP3326171B1 EP 3326171 B1 EP3326171 B1 EP 3326171B1 EP 16753589 A EP16753589 A EP 16753589A EP 3326171 B1 EP3326171 B1 EP 3326171B1
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EP
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Prior art keywords
noise
control device
external
incidence
module
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EP16753589.7A
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German (de)
English (en)
French (fr)
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EP3326171A1 (fr
Inventor
Pierre Guiu
Eric Benhaim
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Orosound
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Orosound
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    • 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
    • G10K11/17837—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 by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear
    • 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
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • 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
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • 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
    • 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
    • G10K2210/111—Directivity control or beam pattern
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3023—Estimation of noise, e.g. on error signals
    • G10K2210/30231—Sources, e.g. identifying noisy processes or components
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3026—Feedback
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3027—Feedforward
    • 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
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3215—Arrays, e.g. for beamforming
    • 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
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3222—Manual tuning
    • 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
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3224—Passive absorbers
    • 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
    • G10K2210/50—Miscellaneous
    • G10K2210/509—Hybrid, i.e. combining different technologies, e.g. passive and active

Definitions

  • the invention relates to the field of noise reduction and, more particularly, to an active noise control device.
  • noisy environments with continuously lower noise levels, which presents a lower short-term risk of hearing impairment but tends to increase fatigue, stress and decrease attention and concentration abilities of these people.
  • noisy environments are found, for example, in shared workspaces (“open space”) used in call centers.
  • open space used in call centers.
  • the noise level must be reduced to improve the working conditions of these people.
  • Some hearing protection devices are equipped with noise control systems that allow noise to be attenuated differently depending on the noise level.
  • helmets dedicated to the protection of strong noises caused by an impact or an explosion are known. These helmets are mainly used to attenuate the sounds of gunfire. They limit gunfire noise while allowing the user to hear lower level sounds.
  • These helmets comprise two headphones each generally comprising a shell, a microphone and a loudspeaker.
  • the shell includes a high-density material providing very high passive attenuation.
  • the microphone picks up surrounding noise outside the hull and restores a filtered signal so that sounds not exceeding a certain predefined threshold (typically 88 dB(A)) are transmitted to a loudspeaker which then emits them to the user's ear.
  • the sounds of voices are thus for example heard by the user, whereas the sounds of shots are muffled.
  • in-ear headphones operating in a similar manner to the headphones which have just been described and which are particularly suitable for protecting a user against loud noises such as those encountered during construction work or in particularly noisy industrial environments (see for example the document US-A-5,355,418 ).
  • the object of the invention is to provide active noise control which is effective and which can be adapted to the type of noise.
  • an active noise control device comprising two passive attenuation earpieces each provided with an external microphone, an internal microphone, and a loudspeaker. loudspeaker to output noise to the headset.
  • the control device comprises a first processing chain comprising a feedforward filter connected to the external microphones, a feedback filter connected to the internal microphones and a restitution module supplying each loudspeaker with a signal restored from the output signals of the feedforward filter and of the feedback filter.
  • the control device comprises a second processing chain comprising a module for identifying sound sources, the second processing chain being implemented parallel to the first processing chain and being adapted to parameterize the first processing chain.
  • the sound source identification module enables the monitoring device to perform active noise control which can be adapted to the type of external noise.
  • the implementation of the second processing chain comprising the identification module in parallel with the first processing chain makes it possible to improve the effectiveness of the active noise control.
  • the active noise control device 1 is intended to equip a user 2 located in a noisy environment (workspace, etc.).
  • the control device 1 makes it possible to improve the access of the user 2 to a noise called “useful noise” prevailing in the noisy environment while attenuating as much as possible a noise called “undesirable noise” also prevailing in the noisy environment. .
  • the term "useful noise” here means a particular type of noise having a particular amplitude and coming from a particular spatial direction.
  • the control device 1 also allows user 2 to listen to music. This function will be mentioned very briefly in the remainder of this description because it does not constitute the heart of the invention.
  • the control device 1 comprises a passive attenuation left atrium 3a and a passive attenuation right atrium 3b each connected by a cable 4 to a box 5 positioned here in a pocket of the user's jacket 2.
  • Each cable 4 comprises a plurality of conductive wires surrounded by a protective sheath, the conductive wires being intended to transmit various analog and digital electrical signals mentioned below and traveling between each of the atria 3 and the housing 5.
  • each headset 3 is presented here in the form of an in-ear earphone which comprises a body 6 and a tip 7 carried by the body 6.
  • the tip 7 has a shape adapted to allow the tip 7 to be inserted into an auditory canal 8 of an ear 9 of the user 2 by closing said auditory canal.
  • the tip 7 holds the headset 3 in the auditory canal 8 of the ear 9 and provides the user 2 with passive sound attenuation by producing sound insulation.
  • Each body 6 delimits an internal acoustic space 11 extending facing the interior of the auditory canal 8 and also defines an external acoustic space 12 extending outside the headset 3.
  • Each headset 3 further comprises an external microphone 14, an internal microphone 15 and a loudspeaker 16 which equip the body 6 of the headset 3.
  • the external microphone 14 is mounted on the body 6 outside the internal acoustic space 11 to pick up external noise prevailing in the external acoustic space 12 and to produce an external electrical signal representative external noise.
  • the external electrical signal from each headset 3 is transmitted to box 5 via cable 4 connecting headset 3 to box 5.
  • the internal microphone 15 is mounted in the body 6 to pick up internal noise prevailing in the internal acoustic space 11 and to produce an internal electrical signal representative of the internal noise.
  • the internal electrical signal of each headset 3 is transmitted to the box 5 via the cable 4 connecting the headset 3 to the box 5.
  • the loudspeaker 16 is positioned so as to reproduce in the internal acoustic space 11 and therefore in the auditory canal 8 of the ear 9 a noise restored from a restored signal produced by the box 5 and transmitted by the box 5 to each headset 3 via cable 4 connecting headset 3 to case 5.
  • the box 5 for its part, comprises an electrical card on which are mounted a plurality of electronic components constituting processing means 20.
  • the processing means 20 comprise a power supply module 21, a microcontroller 22, a clock module 23, an audio source module 24, four analog-digital converters 25, two digital-analog converters 26, first components of analog interface 27, second analog interface components 28 and a DSP 29 (for “Digital Signal Processor”).
  • the power supply module 21 here comprises a rechargeable battery and a power supply circuit which, in particular, manages the battery charge and supplies the electrical card and the earphones 3 via the cables 4 with one or more supply voltages to supply the electrical components of the board and the earpieces 3.
  • the microcontroller 22 and the DSP 29 manage the operation of the electrical card and, more broadly, of the control device 1 as a whole.
  • the clock module 23 comprises a clock component (quartz, etc.) used to clock the operations of the microcontroller 22 and therefore the operations of the other components (analog-digital converters 25, etc.).
  • the audio source module 24 allows the user to listen to music.
  • the audio source module 24 acquires musical signals which are here transmitted to the box 5 by a telephone via wireless communication of the Bluetooth type.
  • the microcontroller 22 receives the musical signals and transmits these musical signals to the earpieces 3 via the cables 4 so that the loudspeakers 16 of the earpieces 3 reproduce the music in the internal acoustic space 11 of each earpiece 3.
  • the analog-to-digital converters 25 convert the external electrical signals and the internal electrical signals produced in the form of analog signals respectively by the external microphones 14 and the internal microphones 15 into digital signals. analog signals restored and musical signals produced by the microcontroller 22 in the form of digital signals.
  • the first analog interface components 27 shape (amplification, attenuation, filtering, etc.) the external electrical signals and the internal electrical signals produced respectively by the external microphones 14 and the internal microphones 15 in the form of analog signals prior to their conversion into digital signals by the analog-digital converters 25.
  • the second analog interface components 28 shape (amplification, attenuation, filtering, etc.) the restored signals and the musical signals following their conversion into signals analog signals by the digital-analog converters 26.
  • a first processing chain 30 is implemented by the microcontroller 22 and the DSP 29 of the processing means 20 of the box 5.
  • the first processing chain 30 comprises the following functional blocks connected in series and arranged successively from upstream to downstream of the first processing chain 30 (that is to say from the input to the output of the first processing chain 30): an external acoustic space partition module 31, a feedforward module 32, a limitation module 33, a restitution module 34, an amplification module 35 and a feedback module 36.
  • the external acoustic space partition module 31 has as inputs the external signal produced by the external microphone 14 of the left atrium 3a and the external signal produced by the external microphone 14 of the right atrium 3b.
  • the external acoustic space partition module 31 combines the external signal produced by the external microphone 14 of the left atrium 3a and the external signal produced by the external microphone 14 of the right atrium 3b to form a directional microphone antenna.
  • the directional microphone antenna has a directivity pattern determined by weighting coefficients and delay coefficients used in the combination of each external signal.
  • the directional microphone antenna formed here and whose directivity diagram 38 is visible on the figure 5 is a "bidirectional broadside of order 1" type antenna.
  • eleven microphone antennas are defined here in different directions.
  • the external acoustic space is thus partitioned into eleven sectors of incidence Sect_i (visible on the figure 1 and on the figure 5 , i varying from 1 to 11) defined in a horizontal plane passing through the external microphones 14.
  • Eleven directional external signals Sign_i are then defined which each correspond to a directional external noise coming from one of the eleven sectors of incidence Sect_i.
  • Each of the eleven directional external signals Sign_i is processed separately by the feedforward module 32 and by the limitation module 33.
  • the feedforward module 32 comprises eleven feedforward filters FF_i which each filter one of the eleven directing external signals Sign_i.
  • Each feedforward filter FF_i operates according to the known principle and not recalled here of the control by anticipation in open loop.
  • the feedforward filter FF_i is adapted either to attenuate or to amplify the directional external noise of the sector of incidence Sect_i and this, to a greater or lesser extent depending on the feedforward parameters of the filter FF_i. If the directional external noise is a useful noise, the corresponding external directional signal Sign_i will be amplified by the corresponding feedforward filter FF_i (or retransmitted as it is). On the contrary, if the directional external noise is an undesirable noise, the corresponding external directional signal Sign_i will be attenuated by the corresponding feedforward filter FF_i.
  • Each feedforward filter FF_i typically allows a maximum attenuation of about 20dB for directional external noise with a frequency between 50Hz and 2kHz.
  • the limiter module 33 comprises eleven limiter filters FL_i which each receive an output signal from one of the eleven feedforward filters FF_i.
  • Each limiting filter FL_i is arranged to limit the output signal of the associated feedforward filter FF_i to prevent the noise reproduced in the internal acoustic space 11 and therefore in the auditory canal 8 of each ear 9 of the user 2 from having a sound level too much important.
  • the limiting filters FL_i therefore make it possible to protect the hearing of the user 2 against a noise of high sound level.
  • the limiting filter FL_i lets through the frequency components of the output signal of the feedforward filter FF_i whose amplitude is less than a limitation threshold, and clips at the level of the limitation threshold the amplitude of the frequency components whose amplitude is greater than the limitation threshold.
  • the restitution module 34 receives the eleven output signals from the limiter module 33 and recombines them taking into account the sector of incidence Sect_i from which they come in order to respect the partition of the external acoustic space 12.
  • the restitution module 34 also receives the musical signals 40 mentioned earlier.
  • the restitution module 34 performs a mixing between the eleven recombined output signals of the limitation module 33 and the musical signals 40 and produces a left restored signal Sr_g and a right restored signal Sr_d which respect the binaural perception of the user 2.
  • the left restored signal Srg and the right restored signal Srd form a stereo signal which is amplified by the amplification module 35 and transmitted to the loudspeaker 16 of the left atrium 3a and to the loudspeaker 16 of the right atrium 3b via cables 4.
  • the loudspeaker 16 of the left atrium 3a and the loudspeaker 16 of the right atrium 3b then reproduce a noise reproduced respectively in the internal acoustic space 11 of the left atrium 3a and in the internal acoustic space 11 of user 2's right earpiece 3b.
  • Each internal microphone 15 picks up the internal noise in the internal acoustic space 11 of the headset 3 and produces an internal electrical signal representative of the internal noise.
  • the feedback module 36 includes two feedback filters E'B (or “filters with feedback”).
  • Each feedback filter FB receives the internal electrical signal from one of the internal microphones 15 and isolates a residual electrical signal corresponding to a residual noise to be attenuated prevailing in the internal acoustic space 11.
  • the residual noise is constituted by the combination of the noise that allows the atria 3 to pass into the internal acoustic space 11 and physiological noises transmitted to the auditory canal by bone conduction.
  • the feedback filters FB then produce an opposite residual electric signal Ser and transmit the opposite residual electric signal Ser to the restitution module 34 so that the restitution module 34 generates an opposite corrective noise of the same gain and in phase opposition with respect to the residual noise. .
  • the residual noise is attenuated in this way, obtaining in particular a maximum attenuation of the order of 30 dB for the low frequency components of the residual noise comprised between 10 Hz and 1 kHz.
  • the feedback module 36 is thus adapted to attenuate the external noise and this, more or less significantly depending on the feedback parameters of the feedback filters FB.
  • the first processing chain 30 operates by using adjustment parameters, which are the feedforward parameters of the feedforward filters FF_i, the feedback parameters of the feedback filters FB and the limitation thresholds of the limiting filters FL_i.
  • the feedforward parameters, the feedback parameters, the limiting thresholds and the passive attenuation provided by the atria 3 contribute to a total gain of the monitor device 1.
  • the total gain of the monitor device 1 can be a total amplification or a total attenuation .
  • the control device 1 comprises first adjustment means implemented in the processing means 20, which make it possible to adjust in a combined manner the limitation thresholds of the limiting filters FL_i, the feedforward parameters of the feedforward filters FF_i and the feedback parameters of the feedback filters FB of the first processing chain 30 (and therefore the total gain of the control device 1).
  • the housing 5 of the control device 1 comprises a first user interface 45 (visible on the figure 1 ) allowing the user 2 of the control device 1 to control the first adjustment means.
  • the first user interface 45 here comprises a potentiometer and one or more adjustment buttons.
  • the first adjustment means allow the user 2 to select whether the total gain is total attenuation or total amplification.
  • user 2 can set a total attenuation level higher or lower than the passive attenuation provided by the earpieces 3 themselves.
  • the first processing chain 30 when the total attenuation level is greater than the passive attenuation 46, which corresponds to the area hatched in dotted lines, the first processing chain 30 must produce additional attenuation to reach the total attenuation level.
  • the feedforward parameters and the feedback parameters are set so that the feedforward filter FF_i concerned and the feedback filters FB provide the additional attenuation.
  • the first adjustment means comprise means for activating the limiting filters FL_i which, in this situation, deactivate the limiting filter FL_i concerned.
  • the feedforward filter FF_i and the feedback filters FB are then used, via an appropriate setting of the feedback parameters and the feedforward parameters, to limit the directional external signal Sign_i.
  • This limitation is added to the passive attenuation provided by the earphones 3 and makes it possible to prevent the noise reproduced from having an excessive sound level. The protection of the hearing of the user 2 is therefore ensured passively by the earpieces 3 and actively by the feedforward filter FF_i and the feedback filters FB when the limiting filter FL__i is deactivated.
  • the first processing chain 30 When the total gain is a total attenuation less than the passive attenuation 46, which corresponds to the solid hatched area on the figure 6 , the first processing chain 30 must amplify the noise to reduce the passive attenuation provided by the earpieces 3.
  • the first processing chain 30 must amplify the noise to cancel the effect of the passive attenuation and provide additional amplification.
  • the directional external noise is a useful noise, such as speech noise, that the user 2 wishes to amplify or at least listen to by reducing the impact of the passive attenuation produced by the earpieces 3
  • the directional external signal Sign_i is then retransmitted as it is or amplified in a frequency band typically comprised between 50 Hz and 8 kHz.
  • the feedforward parameters are set so that the feedforward filters FF_i achieve full amplification.
  • the means for activating the limiting filters FL_i in these situations, activate the limiting filter FL_i concerned.
  • the protection of the hearing of the user 2 against noises of high sound level is therefore ensured passively by the atria 3 and actively by the limiting filter FL_i.
  • the limitation threshold is adjusted as a function of the total gain: the greater the amplification provided by the first processing chain, the higher the limitation threshold.
  • high sound level noises are limited in proportion to the adjustment of the total gain made by the user 2. Beyond a certain total gain, the limitation threshold no longer varies, it is then fixed at the maximum level to preserve user's ears.
  • a second processing chain 50 is implemented by the microcontroller 22 of the processing means 20 in the box 5.
  • the second processing chain 50 includes a sound source identification module 51.
  • the identification module 51 comprises eleven identification inputs Ent_i and a parameter setting output Sp.
  • Each identification input Ent_i is connected to the partition module of the external acoustic space 31 and receives one of the eleven directing external signals Sign_i which each correspond to a directing external noise coming from one of the eleven sectors of incidence Sect_i .
  • the Sp parameter setting output is linked to the feedforward module 32, the limitation module 33 and the feedback module 36.
  • the identification module 51 is suitable for setting the first processing chain 30 via the setting output Sp by setting the feedforward module 32 (and therefore by setting the feedforward parameters), the limitation module 33 (and therefore by setting the thresholds limitation) and the feedback module 36 (and therefore by adjusting the feedback parameters) .
  • the control device 1 comprises second adjustment means implemented in the processing means 20 to adjust the identification module 51.
  • the housing 5 of the control device 1 comprises a second user interface 53 allowing the user 2 of the control device 1 to control the second adjustment means.
  • the identification module 51 operates as follows.
  • the user can select a type of useful noise (speech noise, alarm, etc.), first sectors of incidence Sect1 and second sectors of incidence Sect2 among the eleven sectors of incidence Sect_i.
  • a type of useful noise speech noise, alarm, etc.
  • the identification module 51 greatly or even completely attenuates any directive external noise coming from the second sectors of incidence Sect2.
  • the identification module 51 identifies whether the directional external noise coming from each first sector of incidence Sect1 is useful noise, depending on the choice of the user.
  • the identification of the type of directional external noise is carried out from a plurality of parameters extracted from the spectral and temporal contents of the directional external signal Sign_i.
  • the identification module 51 configures the first processing chain 30 so that the total gain of the control device 1 is a total amplification, or else a total attenuation lower than the passive attenuation.
  • the total gain level is itself adjusted via the first adjustment means.
  • the identification module 51 configures the first processing chain 30 so that the total gain of the control device is a high total attenuation.
  • the processing carried out by the first processing chain 30 and the processing carried out by the second processing chain 50 are carried out in parallel, that is to say that the identification module 51 of the second processing chain 50 identifies the type or types of useful noise in the first incidence sectors Sect_1 while the first processing chain 30 processes all of the directional external signals Sign_i of the eleven sectors of incidence Sect_i.
  • the setting made by the second processing chain 50 obviously has priority over the setting made via the first setting means. If the user 2 selects a sector of incidence Sect_i as being a second sector Sect2, any directional external noise coming from this sector of incidence is strongly attenuated whatever the adjustments produced via the first adjustment means.
  • the feedforward parameters, the feedback parameters and the limitation thresholds of the first processing chain 30 therefore evolve dynamically according to the processing carried out by the second processing chain 50 (and of course, according to the settings made by the user 2 via the first adjustment means and the second adjustment means).
  • the active noise control carried out by the first processing chain 30 and by the second processing chain 50 in parallel is thus more reactive but also clearly more effective.
  • the processing carried out by the first processing chain 30 has very low latency, typically around fifty microseconds for the feedforward filters FF_i, whereas the identification of the noise carried out by the second processing chain 50 requires time larger calculation typically between one millisecond and ten milliseconds.
  • the first processing chain 30 therefore does not experience a delay which would be detrimental both for the processing carried out (for example for the open-loop anticipation control carried out by each of the feedforward filters), but also for the restitution of a useful noise which should not suffer from too much delay.
  • an active noise control device comprising two earpieces connected by cables to a remote box
  • to integrate the processing means of a plurality of control devices into a remote server communicating via a wireless link with the headsets etc.
  • the two earpieces can also form a headset with a mechanical connecting element (headband), and can not be in the form of in-ear headphones but in the form of intra-concha, circum-aural, supra-aural devices. , etc.
  • the processing chains can be carried out "in analog", each module or filter then consisting of a plurality of analog components.
  • the antenna formed thanks to the two external microphones is a bidirectional broadside antenna of order 1, it is perfectly possible to constitute another type of antenna (having a diagram of the cardioid, hyper-cardioid, etc.). It is also perfectly possible to use a different number of external microphones, and to partition the space into a number of different sectors.
  • control device allows here to listen to music, this application is in no way restrictive, and the control device can perfectly well be intended solely for controlling noise, or can be connected to a fixed or mobile telephone and be used to hold a telephone conversation, etc.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP16753589.7A 2015-07-24 2016-07-22 Dispositif de controle actif de bruit Active EP3326171B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1557050A FR3039311B1 (fr) 2015-07-24 2015-07-24 Dispositif de controle actif de bruit
PCT/EP2016/067590 WO2017017038A1 (fr) 2015-07-24 2016-07-22 Dispositif de controle actif de bruit

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EP3326171A1 EP3326171A1 (fr) 2018-05-30
EP3326171B1 true EP3326171B1 (fr) 2023-08-30

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EP (1) EP3326171B1 (ja)
JP (1) JP2018528485A (ja)
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WO (1) WO2017017038A1 (ja)

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Also Published As

Publication number Publication date
FR3039311A1 (fr) 2017-01-27
US20180197527A1 (en) 2018-07-12
US10424287B2 (en) 2019-09-24
EP3326171A1 (fr) 2018-05-30
WO2017017038A1 (fr) 2017-02-02
FR3039311B1 (fr) 2017-08-18
JP2018528485A (ja) 2018-09-27

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