Sound level method and manager, sound reproduction device and audio headset using same

Abstract

The invention relates to a sound level method and a sound level manager for managing sound levels when reproducing a sound signal, a sound reproduction device and an audio headset using same. The invention relates to a management method for managing the sound levels when reproducing a sound signal, the management method comprising: - generating a signal for managing the sound reproduction of a sound signal according to at least one parameter of a captured neural signal relating to a hearing tolerance when listening to the reproduced sound signal. Thus, the invention makes it possible to automatically manage the sound level: either by adjusting it automatically or by signalling to the user that the sound level is not suitable (in particular too high) according to how it is perceived by the user's brain. Specifically, the user's brain is able to detect that the sound level is not suitable, even though it would appear the user themself is enjoying the current sound level.

Description

Sound level method and manager, sound reproduction device and audio headset using same

[0001] The invention relates to a method and a manager of the sound level during reproduction of a sound signal, a sound reproduction device and an audio headset using the same. State of the art

[0002] Nowadays, more and more people, especially young people, are listening to music through headphones. The WHO warns that 53% of young people listen to their music at levels that are too high and dangerous for their hearing, as indicated in the article from the Agence Science-Presse "Headphones: are young people's hearing more at risk? True" (https: / www.scientifique-en-chef.gouv.qc.ca / impacts / ddr_ecouteurs-louie-des-jeunes-plus-a-risque-vrai / ). The same study points out that more and more young people and adults are suffering from damage to their hearing due to the improper use of headphones. This damage is often irreversible, so we must focus on preventing these problems and act early.

[0003] When listening with headphones, you may be forced to turn up the volume due to ambient noise, for example on public transport. This increases the volume of the music or communication, which becomes dangerous for your health without you realizing it. Other people enjoy their music at a loud level, without being aware of the risks to their hearing. Indeed, excessively high sound levels can damage hearing without the user realizing it. There is generally no pain or warning signs. The first signs (e.g. tinnitus) appear when it is already too late.

[0004] One of the aims of the present invention is to remedy drawbacks / shortcomings of the state of the art / to provide improvements over the state of the art.

[0005] An object of the invention is a method for managing the sound level during reproduction of a sound signal, the management method comprising: - generating a signal for managing a sound reproduction of a sound signal as a function of at least one parameter of a captured neural signal relating to an auditory tolerance during listening to the reproduced sound signal.

[0006] Thus, the invention makes it possible to automatically manage the sound level: either by automatically adjusting it, or by signaling to the user that the sound level is not appropriate (in particular too high) based on the user's brain's perception. Indeed, the user's brain is able to detect that the sound level is not appropriate even when the user himself seems to appreciate the current sound level. Consequently, the parameter of the captured neural signal relating to auditory tolerance makes it possible to determine that the sound level is inappropriate for the auditory system of a particular user.

[0007] Advantageously, the management method comprises: - triggering the generation as soon as the value of the parameter of the captured neural signal relating to an auditory tolerance crosses a predetermined threshold value.

[0008] Thus, sound level management is immediate and does not allow time for ear damage to set in, particularly during very high intensity sound signals, for example sound signals of more than 100dB for which damage can occur after only 15 minutes.

[0009] Advantageously, the threshold value is one of the following: - a maximum alert value; - a maximum tolerance value; - a minimum value.

[0010] Thus, different management options can be considered depending on the type of threshold value. For example, the alert value triggers an indication to the user when this first threshold is crossed, and the tolerance value triggers an automatic reduction in the sound level until the detected neural signal returns to a normal value range.

[0011] Advantageously, the generation trigger depends on the user context of sound reproduction.

[0012] Thus, the management of the sound level takes into account not only the sound level, also called sound volume, but also the listening context, that is to say in particular the listening duration and / or the listening frequency. For example, the threshold values ​​may be a function of the context of use. In particular, for a context corresponding to long-term and / or frequent listening, the maximum tolerance value will be lower than for a short and / or rare listening context. For example, in a user context such as listening in an external urban environment, in particular in the street, the sound level will be automatically adjusted so that the user maintains relative attention to his context (in particular to the vehicles surrounding him).

[0013] Advantageously, the at least one parameter of the neural signal comprises at least one parameter from among the following: - a parameter of the beta wave of the neural signal; - a parameter of the alpha wave of the neural signal; - an absolute power of a wave of the neural signal.

[0014] Thus, the use of the beta wave makes it possible to detect, depending on the value of the beta wave parameter, whether the user listening to the reproduction of the sound signal is simply concentrating, which indicates listening with an appropriate sound level (in particular a sound level that is too high, or even aggressive for the user's hearing), or whether the user is anxious, which indicates an inappropriate sound level, or even several stages of inadequacy of the sound level with the user's hearing.

[0015] Thus, the use of the alpha wave makes it possible to detect, depending on the value of the alpha wave parameter, whether the user listening to the reproduction of the sound signal is relaxed or alert, which indicates listening with an appropriate sound level. In particular, the detection of a drop in the alpha wave makes it possible to detect a variation in the sound level towards an inappropriate level.

[0016] Thus, the use of absolute power allows better detection of alpha and beta waves and therefore better management of the sound level.

[0017] Advantageously, the management signal comprises at least one signal from among the following: - an indicator signal; - a control signal for the sound reproduction device reproducing the sound signal.

[0018] Thus, the indicator signal allows the user to be notified of an inappropriate sound level, giving them the option of acting on it or not. The user is then aware of the risk they are taking to their hearing. And, the control signal allows automatic adjustment of the sound level to protect the user's hearing.

[0019] These two types of signals can be used: - either alone, for example, for separate thresholds, or at the user's discretion, who prefers to keep control of the reproduction sound level (indicator signal) or automatically protect his hearing (control signal); - or in combination, so that when automatic adjustment is implemented, the user is informed at the same time of the reason for this automatic adjustment by the indicator signal.

[0020] Advantageously, the management method comprises: - controlling a variation in the sound level as a function of a variation in the parameter of the captured neural signal relating to hearing tolerance.

[0021] Advantageously, the controlled direction of variation of the sound level is at least one of the following directions: - a direction identical to the direction of variation of the parameter of the beta wave of the neural signal; - a direction inverse to the direction of variation of the parameter of the alpha wave of the neural signal.

[0022] Advantageously, in which the indicator signal is at least one indicator among the following:- a visual indicator;- an onomatopoeia type sound indicator;- an audible alarm type sound indicator;- an audio message type sound indicator.

[0023] Advantageously, the management method comprises one of the following steps: - replacing, in the signal to be reproduced, the sound signal with a sound indicator signal; - mixing the sound indicator signal with the sound signal, the mixed sound signal constituting the signal to be reproduced.

[0024] Thus, the replacement allows for better listening of the sound indicator since it is reproduced alone, especially if it includes an audio message. And, the mixing allows for continued listening of the sound signal during the sound indication of the inappropriate sound level.

[0025] Advantageously, according to an implementation of the invention, the different steps of the method according to the invention are implemented by software or computer program, this software comprising software instructions intended to be executed by a data processor of a sound level manager forming part in particular of a sound reproduction device and / or an audio headset and being designed to control the execution of the different steps of this method.

[0026] The invention therefore also relates to a program comprising program code instructions for executing the steps of the management method according to the invention when said program is executed by a processor.

[0027] This program may use any programming language and be in the form of source code, object code, or code intermediate between source code and object code, such as in a partially compiled form or in any other desirable form.

[0028] An object of the invention is also a sound level manager during reproduction of a sound signal, the manager comprising: - a signal generator for managing a sound reproduction of a sound signal as a function of at least one parameter of a captured neural signal relating to an auditory tolerance during listening to the reproduced sound signal.

[0029] An object of the invention is also a sound reproduction device capable of reproducing a signal to be reproduced comprising a sound signal, the reproduction device comprising: - an actuator capable of being managed as a function of a signal for managing a sound reproduction of a sound signal as a function of at least one parameter of a captured neural signal relating to an auditory tolerance during listening to the sound signal reproduced by a direct neural interface co-located with the sound reproduction device.

[0030] Advantageously, the actuator comprises at least one actuator from among the following: - a display capable of being controlled as a function of the management signal; - a display capable of reproducing a message included in the management signal; - a sound level controller capable of being controlled as a function of the management signal; - a switch capable of replacing in a signal to be reproduced a sound signal with the management signal; - a mixer capable of mixing the sound signal and the management signal, the mixed sound signal constituting the signal to be reproduced.

[0031] Advantageously, an audio headset comprises:- a sound level manager according to the invention;- a sound reproduction device according to the invention, and- a direct neural interface capable of capturing the neural signal while listening to the reproduced sound signal.

[0032] Thus, the equipment worn by the user to listen to audio content protects their hearing in a personalized way and without additional equipment.

[0033] The characteristics and advantages of the invention will appear more clearly on reading the description, given by way of example, and the figures relating thereto which represent:

[0034] , a simplified diagram of a management method according to the invention;

[0035] , a simplified diagram of a manager according to the invention;

[0036] , a simplified diagram of a sound reproduction device according to the invention;

[0037] , a simplified diagram of an audio headset according to the invention;

[0038] , a simplified diagram of the captured neural signals and the sound signals reproduced according to the invention.

[0039] Illustrates a simplified diagram of a management method according to the invention.

[0040] The SL_MNGT management method manages the sound level sl during a SS_PLY reproduction of a sound signal ss(t). The SL_MNGT management method comprises: - generating SM_GN a management signal sm(t) of a sound reproduction of a sound signal according to at least one parameter p sn (t) of a neural signal sn(t) captured during listening to the reproduced sound signal sr(t).

[0041] In particular, the SL_MNGT management method includes: - triggering GN_TRG the generation SM_GN as soon as the value of the parameter of the captured neural signal relating to an auditory tolerance sn(t) crosses a predetermined threshold value vs.

[0042] A threshold value is understood to mean a value related to hearing tolerance such as a starting intolerance value or an ultimate intolerance value.

[0043] In particular, the threshold value vs is one of the following:- a maximum alert value will max ;- a maximum tolerance value vtmax ;- a minimum value vs min ;- etc.

[0044] For example, the maximum alert value is a value of the start of intolerance or low discomfort that can cause long-term damage to the hearing system; the maximum tolerance value is an ultimate intolerance value or a value beyond which the risk of hearing damage is irreversible; a minimum value is a low / moderate or maximum intolerance or discomfort value that can cause attention and listening problems.

[0045] In particular, the triggering of GN_TRG generation depends on the user context c U (t) of sound reproduction.

[0046] In particular, the at least parameter p sn (t) of the neural signal comprises at least one parameter among the following:- a parameter of the beta wave of the neural signal ;- a parameter of the alpha wave of the neural signal ;- an absolute power of a wave of the neural signal pa o (t) .

[0047] In particular, the management signal sm(t) comprises at least one signal from among the following:- an indicator signal si(t);- a control signal sc(t) of the sound reproduction device reproducing SS_PLY the sound signal ss(t).

[0048] In particular, the SL_MNGT management method includes:- commanding SL_CNT to vary the sound level depending on a variation in the parameter of the captured neural signal relative to auditory tolerance .

[0049] In particular, the direction of controlled variation of the sound level is at least one of the following directions: - a direction identical to the direction of variation of the parameter of the beta wave of the neuronal signal ;- a direction inverse to the direction of variation of the alpha wave parameter of the neuronal signal .

[0050] In particular, the indicator signal si(t) is at least one of the following indicators:- a visual indicator;- an onomatopoeic type sound indicator;- an audible alarm type sound indicator;- an audio message type sound indicator.

[0051] In particular, the SL_MNGT management method comprises one of the following steps: - replacing SUBST, in the signal to be reproduced s(t), the sound signal ss(t) with a sound indicator signal si(t); - mixing MIX the sound indicator signal si(t) with the sound signal ss(t), the mixed sound signal ss'(t) constituting the signal to be reproduced s(t).

[0052] In particular, the SL_MNGT management method comprises: - collecting SN_CL (not illustrated) a captured neural signal sn(t) during listening by a user U of the reproduced sound signal sr(t).

[0053] In particular, the CN_CL collection of the captured neural signal sn(t) comprises one of the following steps: - capturing SN_CPT a neural signal from a user U while the user U is listening to the reproduced sound signal sr(t); - receiving SN_RCV, from a NCPT neural sensor (not shown) or a direct BCI neural interface, a neural signal sn(t) from a user U captured while the user U is listening to the reproduced sound signal sr(t).

[0054] In particular, the SL_MNGT management method comprises: - extracting a neuronal wave from a captured neuronal signal sn(t) , especially an alpha wave or a beta wave .

[0055] In particular, the SL_MNGT management method includes:- checking FT(vs) ? if the value of a parameter of the captured neural signal relating to an auditory tolerance crosses a threshold value vs. In particular, the FT(vs) ? check determines if the value of a parameter of a wave of the captured neural signal crosses the threshold value vs.

[0056] Crossing a threshold value is understood, for example:- either that the value of the parameter decreases below the threshold value when the threshold value is a minimum value,- or that the value of the parameter increases above the threshold value when the threshold value is a maximum value,- more generally that the value of the parameter or the absolute value of the parameter leaves a range of values ​​bounded by at least one threshold value vs, for example , etc.

[0057] In particular, if the result of the FT(vs) ? check is positive, then the SL_MNGT management process includes the triggering of GN_TRG generation.

[0058] In particular, the GN_TRG generation trigger activates the generation of the SM_GN management signal by means of a trg trigger signal.

[0059] Note: the triggering of GN_TRG generation depends, in particular, on the user context c U (t) of sound reproduction. Note that the dependence of the GN_TRG generation trigger is a dependency notably among the following: - the user context c U (t) conditions the activation of the generation of management signal SM_GN by the triggering of generation GN_TRG (i.e., for a given user context c U(t), the generation of management signal SM_GN might not be activated even if the check FT(vs)? is positive; or vice versa; - the trigger signal trg contains information relating to the user context c U (t) ;- etc.

[0060] In particular, the generation of management signal SM_GN comprises at least one of the following steps: - generating an indicator signal SI_GN; - generating a control signal SC_GN of the sound reproduction device.

[0061] In particular, the generation of indicator signal SI_GN comprises at least one of the following steps: - determining SI_SLT an indicator signal si(t) as a function of the captured neural signal sn(t); - determining MSSG_SLT a message mssg as a function of the captured neural signal sn(t) and vocally synthesizing the determined message SYNT, the resulting indicator signal si(t) being constituted by the determined message vocally synthesized.

[0062] The determination of an indicator signal SI_SLT includes in particular a search (not illustrated) for an indicator signal si(t) as a function of the captured neuronal signal sn(t) in particular in a database of indicator signals, on the Internet, etc.

[0063] As a complement or alternative to the search for indicator signals, the determination of an indicator signal SI_SLT is carried out by creating and / or modifying indicator signals (not illustrated) in particular based on learning. The creation and / or modification of indicator signals is carried out by a neural network, an artificial intelligence device, etc.

[0064] The determination of a MSSG_SLT message includes in particular a search (not illustrated) for a message mssg based on the captured neural signal sn(t) in particular in a message database, on the Internet, etc.

[0065] As a complement or alternative to message searching, the determination of an MSSG_SLT message is carried out by creating and / or modifying messages (not shown), notably based on learning. The creation and / or modification of messages is carried out by a neural network, an artificial intelligence device, etc.

[0066] The generation of a control signal SC_GN includes in particular a determination of a control signal sc(t). In particular, the determination of the control signal sc(t) includes in particular a search (not illustrated) for a control signal sc(t) as a function of the captured neural signal sn(t) in particular in a database of indicator signals, on the Internet, etc.

[0067] In addition to or as an alternative to the search for control signals, the generation of a SC_GN control signal involves the creation and / or modification of control signals (not shown), notably based on learning. The creation and / or modification of control signals is carried out by a neural network, an artificial intelligence device, etc.

[0068] In particular, the management method SL_MNGT comprises a transmission of the management signal SM_EM (not shown), SI_TRT, SC_CNT, the management signal sm(t) comprising at least one indicator signal si(t) and / or one control signal sc(t) thus generated such that, respectively, the indicator signal si(t) is reproduced by the reproduction SS_PLY mixed or not in the reproduced sound signal sr(t) and / or the control signal controls the sound level of the reproduction SS_PLY of the reproduced sound signal sr(t).

[0069] In particular, the SL_MNGT management method comprises a SI_TRT processing of the sound signal to be reproduced s(t) as a function of the generated indicator signal si(t). In particular, the SI_TRT processing comprises one of the following steps: - replacing SUBST, in the signal to be reproduced s(t), the sound signal ss(t) with a sound indicator signal si(t); - mixing MIX the sound indicator signal si(t) with the sound signal ss(t), the mixed sound signal ss'(t) constituting the signal to be reproduced s(t).

[0070] In particular, the SI_TRT processing includes a CMT switching providing the signal to be reproduced s(t) and the generated sound indicator signal si(t) to the SUBST replacement or to the MIX mixing depending in particular on a prior setting of the SI_TRT processing in particular by the user, by parental control, etc. depending on whether or not he prefers to continue listening to the sound signal ss(t) during the reproduction of a sound level indicator signal.

[0071] In particular, the SI_TRT processing includes a SI_EM emission (not shown) of the indicator signal for reproduction by the SS_PLY reproduction in a signal to be reproduced s(t) comprising either the indicator signal alone si(t) provided by the SUBST substitution, or the indicator signal si(t) mixed with the sound signal ss(t) provided by the MIX mixing.

[0072] Alternatively (not shown), the transmission of the management signal SM_EM transmits an indicator signal si(t) generated by the management process SL_MNGT to a processing SI_TRT external to the management process SL_MNGT.

[0073] In particular, the management method SL_MNGT comprises the control of variation of the sound level SL_CNT as a function of the generated control signal sc(t). In particular, the control of variation of the sound level SL_CNT comprises a transmission SC_EM (not illustrated) of the control signal sc(t), for example in the form of a transmission of the controlled sound level sl' as a function of the control signal sc(t).

[0074] Alternatively (not shown), the transmission of the management signal SM_EM transmits a control signal sc(t) generated by the management method SL_MNGT to a sound level variation command SL_CNT external to the management method SL_MNGT.

[0075] A particular embodiment of the management method is a program comprising program code instructions for executing the steps of the method for managing the reproduction sound level SL_MNGT when said program is executed by a processor.

[0076] Illustrates a simplified diagram of a manager according to the invention.

[0077] The sound level manager 3 is capable of managing the sound level of reproduction of a sound signal during a reproduction of the sound signal. The manager 3 comprises: - a generator 35 of a management signal sm(t) of a sound reproduction of a sound signal s(t) as a function of at least one parameter p sn (t) of a neural signal sn(t) captured during listening to the reproduced sound signal sr(t).

[0078] In particular, the manager 3 comprises a transmitter 30 capable of emitting and / or receiving signals including in particular: - receiving the signal to be reproduced s(t) comprising the sound signal ss(t); - receiving a captured neuronal signal sn(t); - emitting a management signal sm(t); etc.

[0079] In particular, the manager 3 comprises a receiver 301 capable of receiving signals including in particular: - receiving the signal to be reproduced s(t) comprising the sound signal ss(t); - receiving a captured neuronal signal sn(t); etc.

[0080] In particular, the manager 3 comprises a transmitter 302 capable of transmitting signals, including in particular transmitting a management signal sm(t).

[0081] The transmitter 30 comprises, for example, the receiver 301 and / or the transmitter 302.

[0082] In particular, the manager 3 comprises: - a collector 32 of captured neural signals sn(t) during listening by a user U of the reproduced sound signal sr(t).

[0083] The collector 32 of captured neural signals sn(t) is notably constituted by at least one of the following devices: - a sensor of neural signals of a user U during listening by the user U of the reproduced sound signal sr(t); - a receiver of captured neural signals sn(t) (notably the receiver 301 or the receiver of the transmitter 30). The neural signal sn(t) of a user U received by the collector 32 being captured during listening by the user U of the reproduced sound signal sr(t). The receiver of captured neural signals sn(t) is notably capable of receiving captured neural signals from a neural sensor (not illustrated) or from a direct neural interface BCI.

[0084] In particular, the manager 3 includes: - a neural wave extractor 33 , especially an alpha wave or a beta wave , of a captured neural signal sn(t) during listening by the user U of the reproduced sound signal sr(t). In particular, the extractor 33 extracts a neural wave from a captured neural signal provided by the collector 32, for example by a sensor or a receiver of previously captured neural signals.

[0085] In particular, the manager 3 comprises: - an activator 34 of the management signal generator 35 as soon as the value of the parameter of the captured neural signal relating to an auditory tolerance sn(t) crosses a predetermined threshold value vs.

[0086] In particular, the threshold value vs is one of the following:- a maximum alert value will max ;- a maximum tolerance value vt max ;- a minimum value vs min ;- etc.

[0087] In particular, the manager 3 comprises: - a verifier 341 of the value of a parameter of the captured neural signal relating to an auditory tolerance relative to a threshold value vs. In particular, the verifier 341 determines whether the value of a parameter of a wave of the captured neural signal exceeds the threshold value vs. The threshold value vs is in particular a value read in a threshold value base 340. For example, the threshold value vs is a function of the user U and / or the user context c U (t) of sound reproduction.

[0088] In particular, if the result provided by the verifier 341 is positive, then the verifier 341 commands the trigger 342 to trigger the management signal generator 35.

[0089] In particular, the trigger 342 activates the management signal generator 35 by means of a trigger signal trg.

[0090] In particular, the activator 34 of the management signal generator 35 comprises one or more of the following devices: - the verifier 341 of the value of a parameter of the captured neural signal relating to an auditory tolerance; - the threshold value base 340; - the trigger 342.

[0091] In particular, the management signal generator 35 comprises at least one of the following devices: - an indicator signal generator 357; - a control signal generator 356 of the sound reproduction device 1, 11.

[0092] In particular, the indicator signal generator 357 comprises at least one of the following devices: - a first analyzer 3570 capable of determining an indicator signal si(t) as a function of the captured neural signal sn(t); - a second analyzer 3571 capable of determining a message mssg as a function of the captured neural signal sn(t), the second analyzer 3571 being coupled to a voice synthesizer 3572 capable of vocally synthesizing the determined message, the resulting indicator signal si(t) being constituted by the determined message vocally synthesized.

[0093] The first analyzer 3570 capable of determining an indicator signal includes in particular a search engine (not illustrated) for an indicator signal si(t) as a function of the captured neural signal sn(t) in particular in a database of indicator signals, on the Internet, etc.

[0094] In addition to or as an alternative to the indicator signal search engine, the first analyzer 3570 capable of determining an indicator signal comprises a creator and / or a modifier of indicator signals (not shown) notably based on learning. The creator and / or modifier of indicator signals notably comprises a neural network, an artificial intelligence device, etc.

[0095] The second analyzer 3571 capable of determining a message mssg includes in particular a search engine (not illustrated) for a message mssg based on the captured neural signal sn(t) in particular in a message database, on the Internet, etc.

[0096] In addition to or as an alternative to the message search engine, the second analyzer 3571 capable of determining a message mssg comprises a message creator and / or modifier (not shown) notably based on learning. The message creator and / or modifier notably comprises a neural network, an artificial intelligence device, etc.

[0097] The control signal generator 356 comprises in particular a third analyzer (not shown) capable of determining a control signal sc(t). In particular, the third analyzer capable of determining the control signal sc(t) comprises in particular a search engine (not shown) for a control signal sc(t) as a function of the captured neural signal sn(t) in particular in a database of indicator signals, on the Internet, etc.

[0098] In addition to or as an alternative to the control signal search engine, the control signal generator 356 comprises a control signal creator and / or modifier (not shown) in particular based on learning. The control signal creator and / or modifier in particular comprises a neural network, an artificial intelligence device, etc.

[0099] In particular, the manager 3 comprises a transmitter 30, 302 of the management signal, the management signal sm(t) comprising at least one indicator signal si(t) and / or one control signal sc(t) thus generated such that, respectively, the indicator signal si(t) is reproduced by the reproduction device 1, 11 mixed or not in the reproduced sound signal sr(t) and / or the control signal controls the sound level of the reproduction of the reproduced sound signal sr(t).

[0100] In particular, the manager 3 comprises a processor 37 for processing the sound signal to be reproduced s(t) as a function of the generated indicator signal si(t). In particular, the processing processor 37 comprises one of the following devices: - a device 371 for replacing, in the signal to be reproduced s(t), the sound signal ss(t) with a sound indicator signal si(t); - a mixer, also called a mixer, 372 of the sound indicator signal si(t) with the sound signal ss(t), the mixed sound signal ss'(t) constituting the signal to be reproduced s(t).

[0101] In particular, the processing processor 37 comprises a switch 370 supplying the signal to be reproduced s(t) and the generated sound indicator signal si(t) to the replacement device 371 or to the mixer 372 depending in particular on a prior adjustment of the processing implemented by the processing processor 37 in particular by the user, by parental control, etc. depending on whether or not he prefers to continue listening to the sound signal ss(t) during the reproduction of a signal indicating the sound level.

[0102] In particular, either the processing processor 37 (case not illustrated), or the manager 3 comprises a transmitter 30, 302, of the indicator signal with a view to its reproduction by the reproduction device 1, 11 in a signal to be reproduced s(t) comprising either the indicator signal alone si(t) supplied by the replacement device 371, or the indicator signal si(t) mixed with the sound signal ss(t) supplied by the mixer 372.

[0103] Alternatively (not shown), the transmitter 30, 302 of the management signal transmits an indicator signal si(t) generated by the manager 3 to a processing processor external (not shown) to the manager 3.

[0104] In particular, the manager 3 comprises a controller 36 for varying the sound level as a function of the generated control signal sc(t). In particular, either the controller 36 (case not illustrated) or the manager 3 comprises a transmitter 30, 302 of the control signal sc(t), for example in the form of an emission of the controlled sound level sl' as a function of the control signal sc(t).

[0105] Alternatively (not shown), the transmitter 30, 302 of the management signal transmits a control signal sc(t) generated by the manager 3 to a sound level variation controller external (not shown) to the manager 3.

[0106] For example, when the parameter of the captured neural signal relating to auditory tolerance indicates that listening to the sound signal may alter the user's auditory system in the more or less long term, the manager 3 generates a management signal comprising a sound level control signal by means of which it controls a sound level variation controller internal 36 or external to the manager 3 so that the sound level is thus reduced.

[0107] Illustrates a simplified diagram of a sound reproduction device according to the invention.

[0108] The sound reproduction device 1 is capable of reproducing a signal to be reproduced s(t) comprising a sound signal ss(t). The reproduction device 1 comprises: - an actuator 16, 17 capable of being managed as a function of a management signal sm(t) of a sound reproduction of a sound signal depending on at least one parameter p sn (t)of a neural signal sn(t) captured, during listening to the reproduced sound signal sr(t), by a direct neural interface 2, 32 co-located with the sound reproduction device 1.

[0109] In particular, the actuator 16, 17 comprises at least one actuator from among the following: - a display 17 capable of being controlled as a function of the management signal; - a display 17 capable of reproducing a message included in the management signal; - a sound level controller 16 capable of being controlled as a function of the management signal; - a switch 17 capable of replacing in a signal to be reproduced a sound signal with the management signal; - a mixer 17 capable of mixing the sound signal and the management signal, the mixed sound signal constituting the signal to be reproduced.

[0110] In particular, the direct neural interface 2, 32 comprises at least one sensor 21 of neural signals sn(t) of a user U.

[0111] In particular, the direct neural interface 2, 32 is capable of providing the manager 3 with a neural signal captured while the user U is listening to a reproduced sound signal sr(t). For example, when the direct neural interface 2 is external to the manager 3, the direct neural interface comprises in particular a transmitter 20 capable of transmitting the captured neural signal sn(t) to the manager 3 via in particular a second communication network 52. In another example, when the manager 3 comprises the direct neural interface 32, the direct neural interface 32 is connected to the management signal generator 35 directly (to which it provides the captured neural signal sn(t)) or indirectly in particular via one or more of the following devices: the extractor 33, the activator 34, the verifier 341, the trigger 342, etc. (the captured neural signal will then be provided to the device directly connected to the direct neural interface 32).

[0112] The manager 3 is a sound level manager 3 according to the invention, in particular such as that illustrated by the. The sound level manager 3 is capable of managing the reproduction sound level sl of a sound signal ss(t) during a reproduction of the sound signal. The manager 3 comprises a generator 35 (not illustrated in the) of a management signal sm(t) of a sound reproduction of a sound signal s(t) as a function of at least one parameter p sn (t) of a neural signal sn(t) captured during listening to the reproduced sound signal sr(t).

[0113] In particular, the manager 3 is able to provide the reproduction device 1 with one of the following signals: - the management signal sm(t) generated as a function in particular of the captured neural signal sn(t) during the sound reproduction of the sound signal ss(t), and possibly one or more of the following signals: the sound signal ss(t), the sound level sl used by the reproduced signal sr(t); - a sound level sl' controlled as a function of the management signal sm(t), in particular as a function of a control signal sc(t) of the management signal sm(t); - a sound signal ss'(t) modified as a function of the management signal sm(t), in particular as a function of an indicator signal si(t) of the management signal sm(t); etc.

[0114] The manager 3 provides the signals to the reproduction device in particular via the second communication network 52.

[0115] The reproduction device 1, the manager 3 and, where appropriate, the external direct neural interface 2 being co-located, the second communication network 52 is a local communication network.

[0116] In particular, a sound signal provider 4, 14 provides the signal to be reproduced s(t) comprising a sound signal ss(t).

[0117] In a first embodiment, the sound signal supplier 4 is external to the reproduction device 1 and provides the signal to be reproduced s(t) in particular via a first communication network 51.

[0118] If the sound signal provider 4 is co-located with the reproduction device 1, then the first communication network 51 is also a local communication network. In this case, the first communication network 51 and the second communication network 52 are then either one and the same communication network (i.e. identical communication networks), or separate communication networks (e.g. the first communication network 51 is a Wi-Fi network TM and the second communication network 52a Bluetooth network TM ).

[0119] If the sound signal provider 4 is remote from the reproduction device 1, then the first communication network 51 is a remote communication network. In this case, the first communication network 51 and the second communication network 52 are then separate communication networks (for example, the first communication network 51 is a wired or non-wired Internet network - in particular fiber or 5G, etc. - and the second communication network 52 is a local network - Bluetooth TM For example).

[0120] In a second embodiment, the reproduction device 1 comprises the sound signal supplier 14 which supplies the signal to be reproduced s(t) in particular to the sound reproducer 11, such as a sound card, a loudspeaker, etc., directly or indirectly.

[0121] When the actuator 17 capable of being managed as a function of an indicator signal si(t) of the management signal sm(t) generated by the manager 3, also indication actuator 17, comprises a replacement device and / or a mixer, the sound signal supplier 4, 14 supplies the signal to be reproduced s(t) to the indication actuator 17 which, respectively, replaces the sound signal ss(t) in the signal to be reproduced provided s(t) with the indicator signal si(t) or mixes the sound signal ss(t) in the signal to be reproduced provided s(t) with the indicator signal si(t). The indication actuator 17 then supplies the reproducer 11, in place of the signal to be reproduced s(t) supplied by the supplier 4, 14, with a modified signal to be reproduced comprising a substituted or mixed sound signal ss'(t) comprising the indicator signal si(t).

[0122] When the indication actuator 17 comprises an indicator signal display si(t), the user U reads, in particular in the case of an indicator signal si(t) comprising a text message, or perceives, in particular in the case of an indicator signal activating at least one light indicator, the indicator signal reproduced sir(t).

[0123] When the actuator 16 capable of being managed as a function of a control signal sc(t) of the management signal sm(t) generated by the manager 3, also called control actuator 16, comprises a sound level controller, the sound signal supplier 4, 14 supplies the signal to be reproduced s(t) to the control actuator 16 which modifies the sound level sl of the sound signal ss(t) of the signal to be reproduced supplied s(t) as a function of the control signal sc(t). The control actuator 16 then supplies the reproducer 11 instead of the sound level sl controlled by the user U the modified sound level sl'.

[0124] In particular, the reproduction device 1 comprises a control interface (not illustrated) capable of receiving a sound level command sl from the user U, prior to the implementation of the control actuator 16.

[0125] Thus, the reproduction device 1 is capable of reproducing: - in particular by means of the reproducer 11, a sound signal ss(t) or even a modified sound signal ss'(t) comprising an indicator signal si(t) of a management signal sm(t) generated by the manager 3 with a sound level sl, for example controlled by a user interface (not illustrated), such as the aforementioned control interface, or even a modified sound level sl' as a function of a control signal sc(t) of a management signal sm(t) generated by the manager 3; and / or - in particular by means of a display 17, an indicator signal si(t) of a management signal sm(t) generated by the manager 3 or a visual indicator as a function of a control of the display by the indicator signal si(t).

[0126] Illustrates a simplified diagram of an audio headset according to the invention.

[0127] The audio headset 1 comprising:- a sound level manager 13,- a sound reproduction device 11 comprising at least one sound reproducer 111 r , 111 l , such as an earphone, and- a direct neural interface 12 capable of capturing the neural signal while listening to the reproduced sound signal.

[0128] The manager 13 is a sound level manager according to the invention, in particular such as the manager 3 illustrated by the.

[0129] The sound reproduction device 11 is capable of reproducing a signal to be reproduced s(t) comprising a sound signal ss(t),ss'(t) with a sound level sl, sl'.

[0130] In particular, a sound signal provider 4, 14 (not illustrated by the) provides a signal to be reproduced s(t) comprising a sound signal ss(t).

[0131] In a first embodiment, the sound signal supplier 4 is external to the reproduction device 11, or even external to the audio headset 1, and provides the signal to be reproduced s(t) in particular via a first communication network 51.

[0132] In a second embodiment, the reproduction device 11 comprises the sound signal supplier 14 (not illustrated by the) which supplies the signal to be reproduced s(t) in particular to the sound reproducer 11, such as a sound card, a loudspeaker, etc., directly or indirectly. In particular, the audio headset 1 comprises the sound signal supplier 14.

[0133] In particular, the reproduction device 11 comprises a control interface (not illustrated) capable of receiving a sound level command sl from the user U making it possible to control the sound level of reproduction of the signal reproduced sr(t) by the reproducer 111. r , 111 l .

[0134] In particular, the audio headset 1 and / or the reproduction device 11 comprises a transmitter 10, 110 capable of transmitting and / or receiving signals including in particular a sound signal ss(t), a signal to be reproduced s(t) comprising a sound signal, a sound level control, etc.In particular, the audio headset 1 and / or the reproduction device 11, or even the transmitter 10, 110, comprises one or more of the following devices: - a signal transmitter 101, 1101 capable of transmitting at least one signal, in particular an indicator signal si(t) of a management signal sm(t) to a communication terminal, in particular a communication terminal of a third party (for example, the mobile telephone of a parent); - a signal receiver 102, 1102 capable of receiving at least one signal, in particular a sound signal ss(t) or a signal to be reproduced s(t) comprising a sound signal coming from a sound signal provider, a sound volume control coming from a control interface external to the audio headset, etc.

[0135] Thus, the reproduction device 11 of the audio headset 1 is capable of reproducing a signal to be reproduced s(t) comprising a sound signal ss(t) provided by a sound signal provider 4, 14 (such as an audio file player of an audio content base - not illustrated -, in particular a USB key, a CD, an SD card, etc., an Internet provider of streaming audio content, etc.) with a sound level sl.

[0136] The neural interface 12 is capable of capturing a neural signal sn(t) from the user U while the user U listens to a reproduced sound signal sr(t) comprising the sound signal ss(t) with a sound level sl. In particular, the direct neural interface 12 comprises at least one sensor 121 of neural signals sn(t) from a user U.

[0137] In particular, the direct neural interface 12 is capable of providing the manager 13 with the neural signal captured during listening by the user U of a reproduced sound signal sr(t). The audio headset 1 comprising both the direct neural interface 12 and the manager 13, the direct neural interface 12 is connected directly or indirectly to the management signal generator 135 of the manager 13.

[0138] In the following description, several embodiments are envisaged which can be implemented alone or in combination with one or more of them.

[0139] The sound level manager 13 is capable of managing the reproduction sound level sl of a sound signal ss(t) during a reproduction of the sound signal. The manager 13 comprises a generator 135 of a management signal sm(t) of a sound reproduction of a sound signal s(t) as a function of at least one parameter p sn (t)of a neural signal sn(t) captured during listening to the reproduced sound signal sr(t).

[0140] In particular, the manager 13 is capable of providing the reproduction device 11 with one of the following signals: - the management signal sm(t) generated as a function in particular of the captured neural signal sn(t) during the sound reproduction of the sound signal ss(t), and possibly one or more of the following signals: the sound signal ss(t), the sound level sl used by the reproduced signal sr(t); - a sound level sl' controlled as a function of the management signal sm(t), in particular as a function of a control signal sc(t) of the management signal sm(t); - a sound signal ss'(t) modified as a function of the management signal sm(t), in particular as a function of an indicator signal si(t) of the management signal sm(t); etc.

[0141] In a first particular embodiment, the reproduction device 11 comprises: - an actuator 116, 117 capable of being managed as a function of a management signal sm(t) of a sound reproduction of a sound signal depending on at least one parameter p sn (t) of a neural signal sn(t) captured, during listening to the reproduced sound signal sr(t), by a direct neural interface 12.

[0142] In particular, the actuator 116, 117 comprises at least one actuator from among the following: - a display 117 capable of being controlled as a function of the management signal; - a display 117 capable of reproducing a message included in the management signal; - a sound level controller 116 capable of being controlled as a function of the management signal; - a switch 117 capable of replacing in a signal to be reproduced a sound signal with the management signal; - a mixer 117 capable of mixing the sound signal and the management signal, the mixed sound signal constituting the signal to be reproduced.

[0143] For example, the audio headset 1 comprises at least one bezel, a screen of which constitutes a display 117, the screen being in particular an augmented reality type screen. A display 117 is in particular constituted by one or more diodes, in particular LEDs, placed on a shell of an earphone 111. r , 111 lof the headset 1. The diode is notably selected to be visible to the user wearing the headset 1 when it is lit.

[0144] When the actuator 117 capable of being managed as a function of an indicator signal si(t) of the management signal sm(t) generated by the manager 13, also indication actuator 117, comprises a replacement device and / or a mixer, the sound signal supplier 4, 14 supplies the signal to be reproduced s(t) to the indication actuator 117 which, respectively, replaces the sound signal ss(t) in the signal to be reproduced provided s(t) with the indicator signal si(t) or mixes the sound signal ss(t) in the signal to be reproduced provided s(t) with the indicator signal si(t). The indication actuator 117 then supplies the reproducer(s) 111 r , 111 linstead of the signal to be reproduced s(t) provided by the supplier 4, 14 a modified signal to be reproduced comprising a substituted or mixed sound signal ss'(t) comprising the indicator signal si(t).

[0145] When the indication actuator 117 comprises an indicator signal display si(t), the user U reads, in particular in the case of an indicator signal si(t) comprising a text message, or perceives, in particular in the case of an indicator signal activating at least one light indicator, the indicator signal reproduced sir(t).

[0146] When the actuator 116 capable of being managed as a function of a control signal sc(t) of the management signal sm(t) generated by the manager 3, also called control actuator 116, comprises a sound level controller, the sound signal supplier 4, 14 supplies the signal to be reproduced s(t) to the control actuator 116 which modifies the sound level sl of the sound signal ss(t) of the signal to be reproduced supplied s(t) as a function of the control signal sc(t). The control actuator 116 then supplies the reproducer(s) 111 r , 111 l instead of the sound level sl commanded by the user U the modified sound level sl'.

[0147] In a second particular embodiment, the manager 3 comprises at least one of the following devices: - a controller 36 for varying the sound level as a function of the control signal sc(t) generated. In particular, either the controller 136 (case not illustrated, or the manager 3 comprises a transmitter 30, 302 of the control signal sc(t), for example in the form of an emission of the controlled sound level sl' as a function of the control signal sc(t).- a processor 137 for processing the sound signal to be reproduced s(t) as a function of the generated indicator signal si(t). In particular, the processing processor 37 comprises one of the following devices:- a device 371 (not illustrated by la), in the signal to be reproduced s(t), for replacing the sound signal ss(t) with a sound indicator signal si(t);- a mixer, also called a mixer, 372 (not illustrated by la) of the sound indicator signal si(t) with the sound signal ss(t), the mixed sound signal ss'(t) constituting the signal to be reproduced s(t).

[0148] Thus, the reproduction device 11 is capable of reproducing: - in particular by means of the reproducer(s) 111 r , 111 l , an audible signal ss(t) or even a modified audible signal ss'(t) comprising an indicator signal si(t) of a management signal sm(t) generated by the manager 13 with a sound level sl, for example controlled by a user interface (not shown), such as the aforementioned control interface, or even a modified sound level sl' as a function of a control signal sc(t) of a management signal sm(t) generated by the manager 13; and / or- in particular by means of a display 117, an indicator signal si(t) of a management signal sm(t) generated by the manager 13 or a visual indicator as a function of a control of the display by the indicator signal si(t).

[0149] Illustrates a simplified diagram of the neural signals captured and the sound signals reproduced according to the invention.

[0150] In a first time corresponding to the instant t0, the user U listens to a sound signal ss(t0) with a sound level sl(t0) measured in figure 3 by a sound power Pss in decibel (dB) of approximately 60dB. Then the captured neural signals sn(t0) are illustrated above, they can be decomposed into neural waves , especially an alpha wave and a beta wave for a period of time T from this instant t0 : [t0, t0+T[ for which the percentage of absolute power %pa is given in figure 3, for example .

[0151] We note that at time t0, the user's neural signal has an alpha wave whose absolute power is high and a beta wave whose absolute power is low or even non-existent. The manager 3 will then not trigger the generation of a management signal because the alpha and / or beta waves have a parameter, for example an absolute power, of appropriate value compared to a threshold value (because it is higher than this for the alpha wave and / or lower than this for the beta wave in this case). Indeed, the neural signal shows that user U is in an alert state since his alpha wave has a high absolute power and in a concentrated state since his beta wave has a low absolute power.

[0152] At time t1, the sound level of reproduction of the sound signal sl(t1) is increased in particular on command of the user U. The measured sound power Pss then increases to at least 100dB. Then the captured neural signals sn(t1) are illustrated above, they can be decomposed into neural waves , especially an alpha wave and a beta wave for a period of time T from this instant t 1 : [t1, t1+T[ for which the percentage of absolute power %pa is given in figure 3, for example .

[0153] We note that at time t1, the user's neural signal has varied: the absolute power of the alpha wave has decreased and the absolute power of the beta wave has increased significantly. Manager 3 then triggers the generation of a management signal sm(t) because the alpha and / or beta waves have a parameter, for example an absolute power, of inappropriate value compared to a threshold value (because it is lower than this for the alpha wave and / or higher than this for the beta wave in this case). Indeed, the neural signal shows that user U has entered a state of stress since his alpha wave has an absolute power that has decreased and an anxious state since his beta wave has an absolute power that has increased significantly.

[0154] In the example of the, the management signal generated sm(t1) by the sound level management according to the invention comprises at least one of the following signals: - a sound level control signal sc(t1) used by a sound level controller 36, 16 to modify the sound level sl(t1) to a lower modified sound level sl'(t1). Thus, following this modification of the sound level sl'(t1), the measured sound power Pss returns to a lower level (dashed-dotted line); - an indicator signal si(t1) comprising for example a vocal message indicating that the sound level is too high and that it is desirable to lower it, or even that the sound level is dangerous and that it must be lowered immediately.

[0155] Then at a time t2 subsequent to this management of the sound level by the invention, respectively: - the measured sound power is approximately 70dB; and / or - the reproduced sound signal is a modified sound signal ss'(t2) in which an indicator signal si of the management signal sm(t1) generated by the sound level manager will have been either mixed or substituted for the sound signal ss(t2) (dotted line).

[0156] The double-dotted line shows the modified sound signal ss'(t2) for which the sound level sl(t2) will not have been modified, leaving the user the possibility of acting on the sound level sl(t2) himself or not.

[0157] The invention proposes to base itself on the fact that it is possible to find in the EEG signals indicators of the sound level, in particular of the annoyance caused by a sound level that is too loud, and conversely, of the comfort provided.

[0158] In particular, the invention is based on the impact of the sound level on alpha (8-12 Hz) and beta (13-30 Hz) waves. In particular, alpha waves are relevant as an indicator of stress and beta waves are indicative of rapid brain activity or a disturbed brain situation. Thus, at a low or comfortable sound level, alpha waves have high power and beta waves have low power. This combination reflects a state of relaxation in the user and means that the sound level is suitable. On the contrary, when the subjects are exposed to too high a sound level, the power of the beta waves increases, which indicates that the user is in a disturbed state. At the same time, the decrease in the power of the alpha waves shows that the subjects are tense.

[0159] The invention therefore proposes to monitor neural signals, in particular alpha and beta waves, in order to automatically determine whether the user is bothered by the excessively loud listening level, whether they are aware of it or not. In the event that the level is too loud, several approaches exist. It is then possible to reduce the sound level automatically, to mute the sound, and / or to warn the user.

[0160] In the same way, the management method and / or the sound level manager according to the invention is capable of monitoring the Alpha and Beta waves in order to determine whether the listening level is too low. Optionally, depending on a choice (setting) of the user, it will then be possible to automatically increase the sound level or to suggest increasing the sound level.

[0161] The invention thus makes it possible to preserve the safety and / or health of people listening to music with headphones. Automatically adjusting the level prevents damage to users' hearing systems if the music is too loud. If the sound level is too low, this solution makes it possible to automate comfortable adjustment of the sound level.

[0162] The invention also relates to a medium. The information medium may be any entity or device capable of storing the program. For example, the medium may comprise a storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM or a magnetic recording means, for example a floppy disk or a hard disk.

[0163] On the other hand, the information medium may be a transmissible medium such as an electrical or optical signal which may be conveyed via an electrical or optical cable, by radio or by other means. The program according to the invention may in particular be downloaded from a network, in particular of the Internet type.

[0164] Alternatively, the information carrier may be an integrated circuit in which the program is incorporated, the circuit being adapted to perform or to be used in the performance of the method in question.

[0165] In another implementation, the invention is implemented by means of software and / or hardware components. In this regard, the term module can correspond to either a software component or a hardware component. A software component corresponds to one or more computer programs, one or more sub-programs of a program, or more generally to any element of a program or software capable of implementing a function or a set of functions according to the description above. A hardware component corresponds to any element of a hardware assembly capable of implementing a function or a set of functions.

Claims

Method for managing the sound level during reproduction of a sound signal, the management method comprising: - generating a signal for managing a sound reproduction of a sound signal as a function of at least one parameter of a captured neural signal relating to an auditory tolerance during listening to the reproduced sound signal. Management method according to the preceding claim, the management method comprising: - triggering the generation as soon as the value of the parameter of the captured neural signal relating to an auditory tolerance crosses a predetermined threshold value. Management method according to the preceding claim, in which the threshold value is one of the following: - a maximum alert value; - a maximum tolerance value; - a minimum value. Management method according to the preceding claim, in which the generation triggering depends on the user context of sound reproduction. Management method according to one of the preceding claims, in which the at least one parameter of the neural signal comprises at least one parameter from among the following:- a parameter of the beta wave of the neural signal;- a parameter of the alpha wave of the neural signal;- an absolute power of a wave of the neural signal. Management method according to one of the preceding claims, in which the management signal comprises at least one signal from among the following: - an indicator signal; - a control signal for the sound reproduction device reproducing the sound signal. Management method according to one of the preceding claims, the management method comprising:- controlling a variation in the sound level as a function of a variation in the parameter of the captured neural signal relating to a hearing tolerance. Management method according to one of claims 5 and 7, in which the direction of controlled variation of the sound level is at least one direction among the following: - a direction identical to the direction of variation of the parameter of the beta wave of the neural signal; - a direction inverse to the direction of variation of the parameter of the alpha wave of the neural signal. Management method according to claim 6, in which the indicator signal is at least one indicator among the following:- a visual indicator;- an onomatopoeia type sound indicator;- an audible alarm type sound indicator;- an audio message type sound indicator. Management method according to the preceding claim, the management method comprising one of the following steps: - replacing, in the signal to be reproduced, the sound signal with a sound indicator signal; - mixing the sound indicator signal with the sound signal, the mixed sound signal constituting the signal to be reproduced. Program comprising program code instructions for executing the steps of the management method according to any one of the preceding claims when said program is executed by a processor. Sound level manager during reproduction of a sound signal, the manager comprising:- a signal generator for managing a sound reproduction of a sound signal as a function of at least one parameter of a captured neural signal relating to an auditory tolerance during listening to the reproduced sound signal. Sound reproduction device capable of reproducing a signal to be reproduced comprising a sound signal, the reproduction device comprising:- an actuator capable of being managed as a function of a signal for managing a sound reproduction of a sound signal as a function of at least one parameter of a captured neural signal relating to an auditory tolerance during listening to the sound signal reproduced by a direct neural interface co-located with the sound reproduction device. Sound reproduction device according to the preceding claim, in which the actuator comprises at least one actuator among the following:- a display capable of being controlled as a function of the management signal;- a display capable of reproducing a message included in the management signal;- a sound level controller capable of being controlled as a function of the management signal;- a switch capable of replacing in a signal to be reproduced a sound signal with the management signal;- a mixer capable of mixing the sound signal and the management signal, the mixed sound signal constituting the signal to be reproduced. Audio headset comprising:- a sound level manager according to claim 12,- a sound reproduction device according to one of claims 13 or 14, and- a direct neural interface capable of capturing the neural signal while listening to the reproduced sound signal.

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