WO2011151842A1 - Procédé et dispositif d'atténuation permettant d'éviter une écoute clandestine dans un dispositif électronique - Google Patents

Procédé et dispositif d'atténuation permettant d'éviter une écoute clandestine dans un dispositif électronique Download PDF

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Publication number
WO2011151842A1
WO2011151842A1 PCT/IN2011/000369 IN2011000369W WO2011151842A1 WO 2011151842 A1 WO2011151842 A1 WO 2011151842A1 IN 2011000369 W IN2011000369 W IN 2011000369W WO 2011151842 A1 WO2011151842 A1 WO 2011151842A1
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WIPO (PCT)
Prior art keywords
signal
auditory
attenuation
attenuation device
cancellation
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PCT/IN2011/000369
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English (en)
Inventor
Rajmohan Harindranath
Original Assignee
Rajmohan Harindranath
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Application filed by Rajmohan Harindranath filed Critical Rajmohan Harindranath
Publication of WO2011151842A1 publication Critical patent/WO2011151842A1/fr

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/06—Transformation of speech into a non-audible representation, e.g. speech visualisation or speech processing for tactile aids
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Definitions

  • This disclosure relates generally to communication and, more particularly, to avoiding eavesdropping in electronic devices.
  • the active cancellation technique is however limited to cancellation of periodic signals and thus does not support cancellation of voice signals as there is a non-negligible time delay between the noise being registered at a reference microphone and a control signal being produced at a control microphone.
  • the delays can be due to digital control system delays (e.g., filtering, sampling, calculation etc), loudspeaker drive delays, and the like.
  • Overall approximate time delay for an average active noise cancellation system is around 6 milliseconds (ms). However, in 6ms a sound wave would have travelled close to 2 meters in air, implying that for a causal control system, one or more sound sources must be separated by at least 2 meters. But for good active cancellation, the approximate distance between the control microphone and the source should be in the range of centimeters, thereby rendering the conventional active cancellation technique to be unsuitable for tackling the problem of eavesdropping.
  • a voice signal generated by a user, to be transmitted to a receiver may be attenuated through an attenuation device, so that any person in the vicinity of the user is unable to hear the generated voice signal, while allowing the voice signal to pass unchanged to the receiver.
  • the attenuation is performed through a modified active noise cancellation technique.
  • One or more passive cancellation techniques may also be performed in conjunction with the modified active cancellation techniques.
  • the attenuation device can be a part of the electronic device or can be a separate device.
  • the active noise cancellation techniques known in the art do not support cancellation of voice signals due to circuit and hardware delay in generation of one or more cancellation signals, however in the method disclosed herein, one or more subsequent voice signals are predicted and one or more cancellation signals are generated based on the prediction, to attenuate the voice signals.
  • the cancellation is performed only for the voice signals generated by the user, while not affecting other signals in the vicinity of the user, by performing a selective attenuation.
  • one or more subsequent signals of a first auditory signal may be predicted through a prediction unit of an attenuation device.
  • One or more second auditory signals (e.g., subsequent voice signals of the user) may be attenuated based on the predicted subsequent signal through the attenuation device.
  • the subsequent signals may be predicted to overcome any effect of circuit delay and /or randomness of the auditory signals on the attenuation.
  • the attenuation device may be positioned in a vicinity of a source of the second auditory signal (e.g., vocal tract of the user).
  • the subsequent signals may be attenuated through an active cancellation.
  • one or more auditory signals (e.g., noise signals) received from one or more other sources in the vicinity of the source of the second auditory signal may be selectively attenuated through the attenuation device.
  • the audibility and /or reception of the second auditory signals may be reduced beyond the region of the attenuation device due to the attenuation.
  • the second auditory signals may be rendered inaudible to one or more other users in the vicinity of the user, due to the attenuation, thereby avoiding eavesdropping in the vicinity of the source of the second auditory signal.
  • One or more passive cancellation techniques may also be used in combination with the active cancellation to optimize the attenuation.
  • a passive cancellation may be implemented in the vicinity of the electronic device to attenuate the second auditory signals generated by the user.
  • the passive cancellation may be implemented through a passive filter positioned in the vicinity of the electronic device and/or the user (e.g., close to the vocal tract of the user).
  • the attenuation may lead to reduction in audibility and /or reception of the auditory signals beyond the passive filter due to attenuation.
  • the auditory signals may be rendered inaudible to one or more other users in the vicinity of the user, due to the attenuation, thereby avoiding eavesdropping of the auditory signals.
  • the passive cancellation may be implemented in addition to and in conjunction with the active cancellation.
  • the attenuation device disclosed herein may include one or more acoustic to electric transducers (e.g., a microphones) configured to generate at least one reference signal based on one or more auditory signals (e.g., voice signals, noise signals) received at the acoustic to electric transducers.
  • the attenuation device may also include a prediction unit configured to predict at least one subsequent signal of at least one first auditory signal (e.g., a voice signal).
  • the prediction unit may also be configured to generate at least one predicted signal based on the prediction using at least one of the generated reference signal and /or an error signal.
  • the error signal may be generated through an error transducer coupled to the attenuation device.
  • the attenuation device may also include a control unit to generate at least one cancellation signal based on at least one of the predicted signal and /or the error signal.
  • the control unit may include at least one control source to generate at least one control signal to attenuate at least one second auditory signal through an active cancellation using the cancellation signal.
  • Figure 1 is a schematic view of an attenuation device configured to avoid eavesdropping in one or more electronic devices, in accordance with one or more embodiments.
  • Figure 2 is a schematic view of the attenuation device of Figure 1 including multiple acoustic to electric transducers, in accordance with one or more embodiments.
  • Figure 3 is an example scenario illustrating avoiding eavesdropping in a mobile device of a user through an attenuation device, in accordance with one or more embodiments.
  • Figure 4 is a process flow illustrating a method to avoid eavesdropping in electronic devices, in accordance with one or more embodiments.
  • Example embodiments may be used to provide a method, an apparatus and /or an attenuation device to avoid eavesdropping in electronic devices.
  • numerous specific details are set forth in order to provide a thorough understanding of the various embodiments. It may be evident, however, to one skilled in the art that the various embodiments may be practiced without these specific details.
  • FIG. 1 is a schematic view of an attenuation device 100 configured to avoid eavesdropping in one or more electronic devices.
  • the electronic devices may include, but are not limited to, electronic communication devices (e.g., cellular phones), landline telephones, multimedia players, personal digital assistants, and the like.
  • an auditory signal e.g., a voice signal generated by the user of the electronic device
  • an auditory signal may be rendered inaudible and non receptive in the vicinity of the source of the auditory signal (e.g., vocal tract of the user) while allowing it to pass unchanged to the receiver.
  • the voice signals of the user may be transmitted to a receiving device of the friend through a transmitter of the cellular phone of the user but the voice signals may be rendered inaudible to any other person standing close to the user.
  • the attenuation device 100 described herein may enable avoiding eavesdropping of one or more auditory signals.
  • the attenuation device 100 may include one or more acoustic to electric transducers 102 (e.g., the acoustic to electric transducer 102).
  • the acoustic to electric transducers 102 e.g., microphones
  • the acoustic to electric transducers 102 may be configured to generate one or more reference signals based on one or more auditory signals received from a source of a auditory signal 104.
  • the auditory signal (e.g., a first auditory signal, a second auditory signal), may be, for example a voice signal.
  • the voice signals may need to be attenuated in the vicinity of the source of the voice signals.
  • the attenuation device 100 may also include a prediction unit 106 configured to predict at least one subsequent signal of at least one first auditory signal.
  • the prediction unit 106 may also be configured to generate the predicted subsequent signal based on the prediction using the generated reference signal and /or an error signal.
  • the detailed description refers to a first auditory signal and a second auditory signal; however the scope of the method, the attenuation device, and /or the apparatus disclosed herein is not limited to a single auditory signal but may be extended to include an almost unlimited number of auditory signals.
  • the prediction unit 106 may be configured to model a source of the first auditory signal (e.g., vocal tract of a user of the electronic device, a random signal generating device, and the like) to predict the subsequent signals. Modeling the source of the first auditory signal may include creating a circuitry with one or more characteristics identical to the source of the first auditory signal. The characteristics may include, for example, a transfer function. In one or more embodiments, the prediction unit 106 may be configured to use one or more speech coding techniques to model the source of the first auditory signal and /or to predict the subsequent signal.
  • a source of the first auditory signal e.g., vocal tract of a user of the electronic device, a random signal generating device, and the like
  • Modeling the source of the first auditory signal may include creating a circuitry with one or more characteristics identical to the source of the first auditory signal. The characteristics may include, for example, a transfer function.
  • the prediction unit 106 may be configured to use one or more speech coding techniques to model the source
  • the prediction unit 106 may include one or more predictive filters to model the source of the first auditory signal.
  • the predictive filter may include, but is not limited to, a filter based on a vocoder technology.
  • Examples of the predictive filters may include, but is not limited to a code excited linear prediction filter, an algebraic code excited linear predictive filter (CELP), a modified CELP, and the like.
  • the prediction may be performed using the predictive filter based on one or more linear prediction coding techniques similar to the ones used in a low delay CELPs or the vocoder technology.
  • the attenuation device may be positioned at a predetermined distance from a source of the second auditory signal to enable attenuation of the second auditory signal.
  • Examples of the source of the second auditory signal may include, but is not limited to, a vocal tract of a user of the electronic device, an audio signal generating device, and the like.
  • the second auditory signal may be generated by the user subsequently, after a time gap, after generating the first auditory signal.
  • the time gap may be, for example, 10 milliseconds.
  • the attenuation device 100 may be suitably positioned at the predetermined distance from the source of the second auditory signal.
  • the predetermined distance is preferably less than l/5 th the wavelength of the auditory signal.
  • An extent of attenuation is determined by the predetermined distance, for example, positioning the attenuation device 100 at 1/10 the wavelength of the auditory signal may lead to a l OdB attenuation of the second auditory signal.
  • the attenuation device 100 may also include a control unit 108 to generate at least one cancellation signal based on the predicted signal and /or the error signal.
  • the generated cancellation signal may attenuate /or cancel the second auditory signal.
  • the subsequent signal is predicted so as to overcome a circuit delay if any of the control unit 108 causing a delay in generating the cancellation signal. For example, consider an instance where the control unit 108 can generate the cancellation signal only 8ms after receiving the first auditory signal due to circuit delay.
  • the cancellation signal does not attenuate the first auditory signal due to the first auditory signal travelling a distance of 8ms times the speed of sound away.
  • the attenuation device 100 disclosed herein enables prediction of a subsequent signal expected to be received from the source of the first auditory signal 8ms later, through the prediction unit 106, such that the predicted signal may be used to determine the cancellation signal.
  • the prediction unit 106 may have an inherent delay (d2), and the attenuation device may have a basic circuit delay (dl) and therefore the prediction unit 106 may cause a net delay (dl+d2) during prediction.
  • the prediction unit 106 may be configured to predict the subsequent signal taking into account the net delay of the prediction unit 106.
  • the cancellation signal corresponding to the predicted signal may be outputted from the control unit 108 only 8ms later due to the circuit delay. However, since the cancellation signal is determined so as to be complementary to the predicted signal, the determined cancellation signal may be capable of attenuating a second auditory signal generated 8ms later from the source of the first auditory signal or any other source. The attenuation may be performed through an active cancellation.
  • active cancellation refers to reduction of a signal level by cancelling unwanted waves (e.g., acoustic waves) with a second set of electronically generated acoustic waves complimentary to the unwanted waves.
  • the active cancellation may be a global cancellation and/ or a local cancellation.
  • the control unit 108 may include a control source 1 10 (e.g., a loudspeaker) to generate one or more control signals.
  • the control signals may be used to generate the cancellation signals to attenuate one or more second auditory signals through the active cancellation.
  • the control source 1 10 may be external to the control unit 108.
  • multiple control sources may be coupled to the attenuation device 100.
  • the attenuation device 100 may include an error transducer 1 12 operatively coupled to the control unit 108 to generate the error signal.
  • the error signal may be generated based on an attenuated signal obtained from the control unit 108.
  • the attenuation device 100 may include multiple acoustic to electric transducers to prevent external noise signals from affecting the auditory signals.
  • the multiple acoustic to electric transducers may be configured to generate multiple reference signals based on multiple auditory signals.
  • Figure 2 is a schematic view of the attenuation device of Figure 1 with multiple acoustic to electric transducers (e.g., acoustic to electric transducer 102 A , and acoustic to electric transducer 102 N ).
  • the attenuation device 100 may also include a monitoring unit 201 operatively coupled to the acoustic to electric transducers 102 A and 102 N to monitor a time of arrival of each of the auditory signals (e.g., x ⁇ and XN) at the acoustic to electric transducers 102 A and 102 N respectively and / or to communicate the time of arrival to the control source 1 10 to control attenuation of the auditory signal.
  • the monitoring unit 201 may be operatively coupled to the control source 1 10. Based on the communicated time of arrival, the control unit 108 may select one or more of the auditory signals to generate cancellation signal for.
  • the selection may be based on the whether the time of arrival exceeds a predetermined value. Based on the time of arrival, the distance of the source of each of the auditory signals (e.g., source of the auditory signal Xi, 104A and source of the auditory signal X N , 104 N ), from the control unit 108 may be computed. In one or more embodiments, the control unit 108 may select one or more auditory signals originating from the sources at close proximity to the control unit 108. The control unit 108 may generate control signals for the selected auditory signals and may prevent generation of control signals for the rest of the auditory signals.
  • the distance of the source of each of the auditory signals e.g., source of the auditory signal Xi, 104A and source of the auditory signal X N , 104 N
  • the control unit 108 may select one or more auditory signals originating from the sources at close proximity to the control unit 108.
  • the control unit 108 may generate control signals for the selected auditory signals and may prevent generation of control
  • the attenuation device 100 may further include an interface (e.g., a universal serial bus port) to couple the attenuation device 100 to the electronic device.
  • the attenuation device 100 may be embedded in the electronic device. The attenuation device 100 may be internally or externally coupled to the electronic device.
  • FIG. 3 is an example scenario illustrating avoiding eavesdropping in a mobile device 304 of a user 302 through an attenuation device 100, in accordance with one or more embodiments.
  • the attenuation device 100 coupled to the mobile device 304.
  • the user 302 of the mobile device 304 may call a recipient through the mobile device 304.
  • the user 302 may generate one or more random voice signals while speaking to the recipient.
  • the attenuation device 100 may be positioned at a predetermined distance (d) from the vocal tract 306 of the user 302, the vocal tract 306 constituting a source of the random voice signals.
  • the predetermined distance (d) may be one fifth the wavelength of the auditory signal.
  • the voice signals generated while the user 302 speaks may be predicted through a prediction unit within the attenuation device 100. If the reference voice signal is generated at an n millisecond, then the random voice signals expected to be generated ten milliseconds later (at n+10 milliseconds) may be predicted through the prediction unit.
  • a control unit 108 within the attenuation device 100 may generate a cancellation signal based on the random voice signal predicted at the (n+10) th millisecond. When the user 302 begins to speak, the generated cancellation signals may interfere with the random voice signal generated at (n+ 10) 1 ' 1 millisecond by the user 302 and the interference may cause attenuation of the random voice signal.
  • the attenuation may be a 30 dB (decibel) attenuation rendering the random voice signal to be nearly inaudible to a person 308 standing close to the user 302 as illustrated in Figure 2. So the person 308, in spite of standing close to the user 302, may not be able to hear the conversation between the user 302 and the recipient clearly, thereby avoiding eavesdropping with respect to the user 302.
  • the random voice signal may be retrieved from the attenuated signal to be transferred to the transmitter of the mobile device, thereby rendering the random voice signal of the user 302, to be audible to the recipient while avoiding eavesdropping.
  • FIG. 4 is a process flow detailing the operations involved in a method to avoid eavesdropping in electronic devices, in accordance with one or more embodiments.
  • operation 402 may involve predicting at least one subsequent signal of at least one first auditory signal (e.g., a voice signal of a user) through a prediction unit of an attenuation device. For example, given a auditory signal generated by a source of the auditory signal at an instant of time t milliseconds, a new auditory signal; generated 10 milliseconds after t milliseconds (at (10+t) ms) by the source of the auditory signal may be predicted through the prediction unit.
  • a new auditory signal generated 10 milliseconds after t milliseconds (at (10+t) ms
  • the prediction may be, for example, a linear prediction.
  • the attenuation device may be positioned in a vicinity of a source of the first auditory signal (e.g., vocal cord of a user, a signal source, a distributed signal source, and the like).
  • the attenuation device may be coupled to a microphone of a cellular phone of the user.
  • the source of the first auditory signal may be modeled to predict the subsequent signal.
  • modeling the source of the first auditory signal may include creating a circuitry with one or more characteristics identical to the source of the first auditory signal.
  • the characteristics may include, for example, a transfer function.
  • one or more speech coding techniques may be used to model the source of the first auditory signal and /or to predict the subsequent signal.
  • one or more predictive filters may be used to model the source of the first auditory signal. Examples of the predictive filters may include, but is not limited to a code excited linear prediction filter, an algebraic code excited linear predictive filter (CELP), a modified CELP filter, and the like.
  • the prediction may be performed using the predictive filter based on one or more linear prediction coding techniques similar to the ones used in a low delay CELPs or the vocoder technology.
  • operation 404 may involve attenuating at least one second auditory signal based on the predicted subsequent signal, through an attenuation device in the vicinity of a source of the second auditory signal.
  • the attenuation device may be positioned at a distance within a fraction of a wavelength of the second auditory signal, from the source of the second auditory signal. In a preferred embodiment, the distance is within one fifth the wavelength of the second auditory signal and /or the first auditory signal. In some other embodiments, the attenuation device may be positioned at a distance equal to multiple of the wavelength of the second auditory signal.
  • the first auditory signal and /or the second auditory signal may be for example, a voice signal.
  • the attenuation may be for example, about 30 decibel attenuation.
  • at least one reference signal may be generated through at least one acoustic to electric transducer coupled to the attenuation device.
  • the predicted subsequent signal may be generated based on the generated reference signal and/or an error signal.
  • one or more cancellation signals may be generated based on the generated predicted subsequent signal and /or the error signal.
  • the error signal may be generated based on the attenuated signal through an error microphone in the attenuation device.
  • the generated cancellation signal may attenuate the second auditory signal through an active cancellation.
  • the active cancellation may include, but is not limited to global cancellation, local cancellation, and the like.
  • attenuation of at least one auditory signal may be prevented at the attenuation unit.
  • the auditory signal may be, for example, a noise signal. To prevent attenuation, a time of arrival of the auditory signals at one or more of the multiple acoustic to electric transducers may be determined.
  • each auditory signal e.g., external noise signals received from one or more sources in the vicinity of the attenuation device
  • the time of arrival of each auditory signal from among the auditory signals may be compared at each of the acoustic to electric transducers. Based on the comparison at least one auditory signal may be selected. In one or more embodiments, the selection may be based on a distance of a source of the auditory signal from a control unit within the attenuation device. The distance may be computed based on the time of arrival. At least one auditory signal may be selected if the distance is beyond a predetermined distance, that is, the auditory signal may be attenuated only if the source of the auditory signal is in close proximity to the control unit.
  • the attenuation of the selected auditory signal may be prevented at the attenuation device, by preventing generation of cancellation signals for the selected auditory signals.
  • the predetermined distance may be preset based on requirements of a specific application of the method.
  • the second auditory signal may be retrieved from the attenuated signal and may be transferred to a transmitter of an electronic device so as to be audible to a recipient through the electronic device.
  • a passive cancellation may be implemented in the vicinity of the source of the first auditory signal and /or the source of the second auditory signal.
  • a combination of the passive cancellation and the active cancellation may be implemented to attenuate the auditory signals.
  • One or more passive filters may be positioned in the vicinity of the source of the first auditory signal and /or the source of the second auditory signal to implement passive cancellation.
  • the first auditory signal and /or the second auditory signal may be attenuated through the passive cancellation.
  • Examples of the passive filters may include, but are not limited to, ear plugs, foam coverings, and the like.
  • the passive cancellation may be high for high frequency auditory signals.
  • the attenuation may reduce an audibility and /or reception of the second auditory signal in the vicinity of and / or beyond a region of the attenuation device owing to the attenuation.
  • Examples of the passive cancellation may include, but is not limited to, positioning the passive filter in the vicinity of the source of the auditory signal, deflecting and absorbing sound waves, employing earplugs made of foam, installing foam in interior linings of cars or rooms, and also creating huge and thick barriers in a path of the auditory signal.
  • a first characteristic impedance of the source of the auditory signal may be matched with a second characteristic impendence of the passive filter to attenuate the auditory signal through the passive filter.
  • the characteristic impedance of the vocal cord of the user is determined and matched with a characteristic impendence of a foam (passive filter) covering of a microphone of the user, to attenuate one or more voice signals generated by the user arriving at the microphone.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Data Mining & Analysis (AREA)
  • Computational Linguistics (AREA)
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  • Signal Processing (AREA)
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  • Audiology, Speech & Language Pathology (AREA)
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Abstract

Un procédé et un dispositif d'atténuation permettant d'éviter une écoute clandestine dans un dispositif électronique sont proposés. La voix d'un utilisateur du dispositif électronique est atténuée par l'intermédiaire du dispositif d'atténuation pour rendre la voix inaudible pour des personnes se trouvant à proximité de l'utilisateur, tout en permettant à la voix d'être transmise à un récepteur. L'atténuation est effectuée en utilisant une annulation de bruit active modifiée. Un retard de circuit du dispositif d'atténuation est compensé en prédisant un signal vocal subséquent devant être généré par l'utilisateur ensuite et en générant un ou plusieurs signaux d'annulation sur la base de la prédiction. En outre, une distance entre le dispositif d'atténuation et un ou plusieurs points d'origine d'un ou plusieurs signaux vocaux reçus au niveau du dispositif d'atténuation est calculée et une atténuation sélective est exécutée basée sur la distance pour atténuer uniquement la voix de l'utilisateur et aucun autre signal vocal.
PCT/IN2011/000369 2010-06-03 2011-05-30 Procédé et dispositif d'atténuation permettant d'éviter une écoute clandestine dans un dispositif électronique WO2011151842A1 (fr)

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CN111161753A (zh) * 2020-01-03 2020-05-15 上海交通大学 基于智能终端的安全语音交互方法及系统
CN111161753B (zh) * 2020-01-03 2022-08-05 上海交通大学 基于智能终端的安全语音交互方法及系统

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