WO2021043107A1 - 一种会议中防窃听偷录的方法、装置和系统 - Google Patents

一种会议中防窃听偷录的方法、装置和系统 Download PDF

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Publication number
WO2021043107A1
WO2021043107A1 PCT/CN2020/112620 CN2020112620W WO2021043107A1 WO 2021043107 A1 WO2021043107 A1 WO 2021043107A1 CN 2020112620 W CN2020112620 W CN 2020112620W WO 2021043107 A1 WO2021043107 A1 WO 2021043107A1
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signal
acoustic wave
sequence
reverse
specific signal
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PCT/CN2020/112620
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English (en)
French (fr)
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常玲浩
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/80—Jamming or countermeasure characterized by its function
    • H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems

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  • the embodiments of the present application relate to, but are not limited to, the communication field and video conferencing technology, and particularly refer to a method, device, and system for preventing eavesdropping and secret recording in a conference.
  • the embodiments of the present application provide a method, device and system for preventing eavesdropping and secret recording in a meeting.
  • the embodiment of the present application provides a method for preventing eavesdropping and secret recording in a meeting, including any one or more of the following steps: transmitting N first acoustic signals in all directions; wherein, for each first acoustic signal, the first The sound wave signal is obtained by frequency modulation of a specific signal sequence, the average amplitude of the specific signal sequence is greater than or equal to the preset threshold; N is an integer greater than or equal to 1; to one or more of the X audio collectors in the conference A second sound wave signal is directionally emitted from the audio collector; where the first sound wave signal and the second sound wave signal have the same frequency and are in a frequency band that is not perceivable by humans; the second sound wave signal is obtained by frequency modulation in a reverse sequence; The reverse sequence is obtained from N specific signal sequences; X is an integer greater than or equal to 1.
  • the embodiment of the application provides a device for preventing eavesdropping and secret recording in a meeting, which includes a processor and a computer-readable storage medium.
  • the computer-readable storage medium stores instructions, and when the instructions are executed by the processor , Realize any of the above-mentioned methods for preventing eavesdropping and secret recording in a meeting.
  • the embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of any of the methods for preventing eavesdropping and secret recording in a meeting are realized.
  • the embodiment of the application provides a device for preventing eavesdropping and secret recording in a meeting, which includes any one or more of the following modules: N first transmitting modules, X second transmitting modules; where X and N are greater than or An integer equal to 1; wherein the first transmitting module is used to transmit one first acoustic wave signal among the N first acoustic wave signals in all directions; wherein, for each first acoustic wave signal, the first acoustic wave signal The signal is obtained by frequency modulation of a specific signal sequence, and the average amplitude of the specific signal sequence is greater than or equal to a preset threshold; the second transmitting module is used to direct one of the X audio collectors in the conference Transmit a second sound wave signal; among them, the frequency of the first sound wave signal and the second sound wave signal are the same and are in a frequency band that is not perceivable by humans; the second sound wave signal is obtained by frequency modulation of the reverse sequence; the reverse sequence is based on N A specific signal
  • the embodiment of the application provides a system for preventing eavesdropping and secret recording in a conference, including: N first transmitting modules and X second transmitting modules; where X and N are integers greater than or equal to 1;
  • the transmitting module and the second transmitting module are both independent devices; wherein, the first transmitting module is used to transmit one first sound wave signal among the N first sound wave signals in all directions; wherein, for each first sound wave signal Acoustic wave signal, the first acoustic wave signal is obtained by frequency modulation of a specific signal sequence, and the average amplitude of the specific signal sequence is greater than or equal to a preset threshold; the second transmitting module is used to send X audio collectors in the conference A second sound wave signal is directionally emitted at an audio collector in the, where the frequency of the first sound wave signal and the second sound wave signal are the same and are in a frequency band that is not perceivable by humans; the second sound wave signal is frequency-reversed Modulation is obtained; the reverse sequence is obtained according to N specific
  • FIG. 1 is a flowchart of a method for preventing eavesdropping and secret recording in a meeting proposed by an embodiment of the application;
  • FIG. 2 is a flowchart of a method for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • FIG. 3 is a flowchart of a method for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • FIG. 4 is a flowchart of a method for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • FIG. 5 is a schematic diagram of the structural composition of a device for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • FIG. 6(a) is a schematic diagram of the structural composition of a device for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • Figure 6(b) is a schematic diagram of the structure of the interference shielding module and the noise reduction module in Figure 6(a);
  • FIG. 7(a) is a schematic diagram of the structure of a device for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • Figure 7 (b) is a schematic diagram of the structure of the interference shielding module and the noise reduction module in Figure 7 (a);
  • FIG. 8(a) is a schematic structural composition diagram of a device for preventing eavesdropping and secret recording in a meeting proposed by another embodiment of the application;
  • Figure 8(b) is a schematic diagram of the structure of the interference shielding module and the noise reduction module in Figure 8(a);
  • Figure 9 (a) is a schematic diagram 1 of the layout of the anti-eavesdropping and secret recording system (ie, the anti-theft recording system in the figure) in the meeting according to the embodiment of the application;
  • Figure 9(b) is a second schematic diagram of the layout of a system for preventing eavesdropping and secret recording in a meeting according to an embodiment of the application;
  • Figure 9(c) is the third layout diagram of the system for preventing eavesdropping and secret recording in a meeting according to an embodiment of the application.
  • an embodiment of the present application proposes a method for preventing eavesdropping and secret recording in a meeting, which includes any one or more of the following steps:
  • Step 100 Transmit N first acoustic wave signals in all directions; wherein, for each first acoustic wave signal, the first acoustic wave signal is obtained by frequency modulation of a specific signal sequence, and the average amplitude of the specific signal sequence is greater than or equal to The preset threshold; N is an integer greater than or equal to 1.
  • the conference may refer to a video conference or a non-video conference.
  • the N first acoustic wave signals may be sent at the same location in the meeting, or may be sent at different locations in the meeting, which is not limited in the embodiment of the present application.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the embodiment of the present application uses the first acoustic wave signal as noise instead of white noise as noise, because white noise is random noise generated by random sequence modulation, which has randomness, and it is difficult to effectively filter white noise.
  • Step 101 Directly transmit a second sound wave signal to one or more of the X audio collectors in the conference; wherein, the frequency of the first sound wave signal and the second sound wave signal are the same, and they are not perceivable by humans.
  • the second acoustic wave signal is obtained by frequency modulation of the reverse sequence; the reverse sequence is obtained according to N specific signal sequences; X is an integer greater than or equal to 1.
  • the transmission power of the second acoustic wave signal is:
  • P is the transmission power of the second acoustic wave signal
  • P i is the transmission power of the i-th first acoustic wave signal
  • ⁇ is the attenuation coefficient
  • d is the transmission position of the second acoustic wave signal and the the distance between the audio acquisition
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector.
  • the reverse sequence obtained according to N specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • f(t) is the amplitude of the reverse sequence at time t
  • f i (t) is the amplitude of the i-th specific signal sequence at time t
  • t is time
  • d is the second sound wave transmit a position signal between the audio and the collector distance
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector
  • v is the sound propagation in air speed.
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • different first acoustic wave signals among the N first acoustic wave signals are omni-directionally transmitted at different positions of the meeting. Since the first acoustic wave signal is obtained by frequency modulation of a specific signal sequence, the specific signal sequence The average amplitude is greater than or equal to the preset threshold, so that the signal-to-noise ratio of the eavesdropping and secret recording equipment that may exist in the meeting is low when recording the meeting content, and only the "buzzing" noise can be collected, so that the first sound wave signal is The eavesdropping and secret recording equipment that may exist in the meeting is shielded and interfered, and the loopholes caused by man are eliminated, and it is effective for all audio collectors, and it is impossible to separate effective meeting content through post-processing; and, to the audio The second sound wave signal is directionally emitted from the collector, so that the first sound wave signal and the second sound wave signal cancel each other out at the audio collector of the meeting, which realizes active noise reduction and ensures the
  • FIG. 2 another embodiment of the present application proposes a method for preventing eavesdropping and secret recording in a meeting, including any one or more of the following:
  • Step 200 Generate N specific signal sequences; for each of the specific signal sequences, modulate the specific signal sequence into the first sound wave signal with a frequency in a frequency band that is not perceivable by humans; transmit in all directions N first acoustic wave signals; wherein the average amplitude of the specific signal sequence is greater than or equal to a preset threshold, and N is an integer greater than or equal to 1.
  • the conference may refer to a video conference or a non-video conference.
  • the N first acoustic wave signals may be sent at the same location in the meeting, or may be sent at different locations in the meeting, which is not limited in the embodiment of the present application.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • Step 201 Generate X of the reverse sequences according to the N of the specific signal sequences, and for each of the reverse sequences, modulate the reverse sequence into the first frequency in a frequency band that is not perceivable by humans.
  • Two sound wave signals; a second sound wave signal is directionally transmitted to one or more of the X audio collectors in the conference; wherein the frequency of the first sound wave signal and the second sound wave signal are the same; X is greater than or An integer equal to 1.
  • the transmission power of the second acoustic wave signal is:
  • P is the transmission power of the second acoustic wave signal
  • P i is the transmission power of the i-th first acoustic wave signal
  • ⁇ is the attenuation coefficient
  • d is the transmission position of the second acoustic wave signal and the the distance between the audio acquisition
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector.
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • FIG. 3 another embodiment of the present application proposes a method for preventing eavesdropping and secret recording in a meeting, including any one or more of the following:
  • Step 300 Generate M of the specific signal sequences; for each of the generated specific signal sequences, copy the specific signal sequence into P copies to obtain P of the specific signal sequences; for each of the specific signal sequences
  • the conference may refer to a video conference or a non-video conference.
  • the N first acoustic wave signals may be sent at the same location in the meeting, or may be sent at different locations in the meeting, which is not limited in the embodiment of the present application.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • Step 301 Generate X of the reverse sequences according to the N of the specific signal sequences, and for each of the reverse sequences, modulate the reverse sequence into the first frequency in a frequency band that is not perceivable by humans.
  • Two sound wave signals; a second sound wave signal is directionally emitted to one or more of the X audio collectors in the conference; wherein the frequency of the first sound wave signal and the second sound wave signal are the same; X is greater than or An integer equal to 1.
  • the transmission power of the second acoustic wave signal is:
  • P is the transmission power of the second acoustic wave signal
  • P i is the transmission power of the i-th first acoustic wave signal
  • ⁇ is the attenuation coefficient
  • d is the transmission position of the second acoustic wave signal and the the distance between the audio acquisition
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector.
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any time is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • FIG. 4 another embodiment of the present application proposes a method for preventing eavesdropping and secret recording in a meeting, including any one or more of the following:
  • the conference may refer to a video conference or a non-video conference.
  • the N first acoustic wave signals may be sent at the same location in the meeting, or may be sent at different locations in the meeting, which is not limited in the embodiment of the present application.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • Step 401 Generate X of the reverse sequences according to the N of the specific signal sequences, and for each of the reverse sequences, modulate the reverse sequence into the first frequency in a frequency band that is not perceivable by humans.
  • Two sound wave signals; a second sound wave signal is directionally transmitted to one or more of the X audio collectors in the conference; wherein the frequency of the first sound wave signal and the second sound wave signal are the same;
  • X is greater than or An integer equal to 1.
  • the transmission power of the second acoustic wave signal is:
  • P is the transmission power of the second acoustic wave signal
  • P i is the transmission power of the i-th first acoustic wave signal
  • ⁇ is the attenuation coefficient
  • d is the transmission position of the second acoustic wave signal and the the distance between the audio acquisition
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector.
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • Another embodiment of the present application provides a device for preventing eavesdropping and secret recording in a meeting, which includes a processor and a computer-readable storage medium.
  • the computer-readable storage medium stores instructions. When executed, it implements any of the above methods for preventing eavesdropping and secret recording in a meeting.
  • Another embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of any of the above methods for preventing eavesdropping and secret recording in a meeting are realized.
  • another embodiment of the present application proposes a device for preventing eavesdropping and secret recording in a meeting, which includes any one or more of the following modules: N first transmitting modules and X second transmitting modules; wherein, X, N are integers greater than or equal to 1;
  • the first transmitting module 501 is used to transmit one first acoustic wave signal among the N first acoustic wave signals in all directions; wherein, for each first acoustic wave signal, the first acoustic wave signal consists of a specific The signal sequence is obtained by frequency modulation, and the average amplitude of the specific signal sequence is greater than or equal to the preset threshold;
  • the second transmitting module 502 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference; wherein the frequency of the first sound wave signal and the second sound wave signal are the same, and In a frequency band that humans cannot perceive; the second sound wave signal is obtained by frequency modulation of the reverse sequence; the reverse sequence is obtained according to N specific signal sequences.
  • the conference may refer to a video conference or a non-video conference.
  • different first transmitting modules may be located at the same location in the meeting or at different locations in the meeting; different second transmitting modules may be located at the same location in the meeting or at different locations in the meeting.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • P is the transmission power of the second acoustic wave signal
  • P i is the transmission power of the i-th first acoustic wave signal
  • ⁇ is the attenuation coefficient
  • d is the transmission position of the second acoustic wave signal and the the distance between the audio acquisition
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector.
  • the reverse sequence obtained according to N specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • f(t) is the amplitude of the reverse sequence at time t
  • f i (t) is the amplitude of the i-th specific signal sequence at time t
  • t is time
  • d is the second sound wave transmit a position signal between the audio and the collector distance
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector
  • v is the sound propagation in air speed.
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • different first acoustic wave signals among the N first acoustic wave signals are omnidirectionally transmitted at different positions of the conference. Since the first acoustic wave signal is obtained by frequency modulation of a specific signal sequence, the specific signal sequence The average amplitude is greater than or equal to the preset threshold, so that the signal-to-noise ratio of the eavesdropping and secret recording equipment that may exist in the meeting is low when recording the meeting content, and only the “buzzing” noise can be collected, so that the first sound wave signal is The eavesdropping and secret recording equipment that may exist in the meeting is shielded and interfered, and the loopholes caused by man are eliminated, and it is effective for all audio collectors, and it is impossible to separate effective meeting content through post-processing; and, to the audio of the meeting
  • the second sound wave signal is directionally emitted from the collector, so that the first sound wave signal and the second sound wave signal cancel each other out at the audio collector of the meeting, which realizes active noise reduction and ensure
  • FIG. 6(a) another embodiment of the present application proposes a device for preventing eavesdropping and secret recording in a meeting, which includes any one or more of the following modules: N interference shielding modules 601, X noise reduction modules 602 ;
  • each interference shielding module 601 includes: a signal generation module 6011, a first acoustic modulation module 6012, and a first transmission module 6013;
  • each noise reduction module 602 includes: reverse signal generation Module 6021, a second acoustic wave modulation module 6022, and a second transmitting module 6023;
  • the signal generating module 6011 is configured to generate a specific signal sequence; wherein, the average amplitude of the specific signal sequence is greater than or equal to a preset threshold;
  • the first acoustic wave modulation module 6012 is configured to modulate a specific signal sequence into the first acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the first transmitting module 6013 is configured to transmit one first acoustic wave signal among the N first acoustic wave signals in all directions;
  • the reverse signal generating module 6021 is configured to generate the reverse sequence according to the N specific signal sequences
  • the second acoustic wave modulation module 6022 is configured to modulate the reverse sequence into the second acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the second transmitting module 6023 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the signal generation module 6011 may send a specific signal sequence to the reverse signal generation module 6021 in a wired or wireless manner.
  • FIG. 7(a) another embodiment of the present application proposes a device for preventing eavesdropping and secret recording in a meeting, which includes any one or more of the following modules: M interference shielding modules 701, X noise reduction modules 702 ;
  • each interference shielding module 701 includes: a signal generating module 7011, P first acoustic wave modulation modules 7012, and P first transmitting modules 7013; each noise reduction module 702 includes: Reverse signal generating module 7021, second acoustic wave modulation module 7022, and second transmitting module 7023;
  • the signal generation module 7011 is configured to generate one of the specific signal sequences; for each generated specific signal sequence, copy the specific signal sequence into P copies to obtain P specific signal sequences.
  • the first acoustic wave modulation module 7012 is configured to modulate a specific signal sequence into the first acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the first transmitting module 7013 is configured to transmit one first sound wave signal among the N first sound wave signals in all directions;
  • the reverse signal generating module 7021 is configured to generate the reverse sequence according to the N specific signal sequences
  • the second acoustic wave modulation module 7022 is configured to modulate the reverse sequence into the second acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the second transmitting module 7023 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any time is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the signal generation module 7011 may send a specific signal sequence to the reverse signal generation module 7021 in a wired or wireless manner.
  • FIG. 8(a) another embodiment of the present application proposes a device for preventing eavesdropping and secret recording in a meeting, which includes any one or more of the following modules: M interference shielding modules 801, X noise reduction modules 802 ;
  • each interference shielding module 801 includes: a signal generation module 8011, a first acoustic wave modulation module 8012, and P first transmitting modules 8013; each noise reduction module 802 includes: reverse A signal generating module 8021, a second acoustic wave modulation module 8022, and a second transmitting module 8023;
  • the signal generating module 8011 is used to generate a specific signal sequence
  • the first transmitting module 8013 is configured to transmit one first sound wave signal among the N first sound wave signals in all directions;
  • the reverse signal generating module 8021 is configured to generate the reverse sequence according to the N specific signal sequences
  • the second acoustic wave modulation module 8022 is configured to modulate the reverse sequence into the second acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the second transmitting module 8023 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the signal generation module 8011 may send a specific signal sequence to the reverse signal generation module 8021 in a wired or wireless manner.
  • FIG. 5 another embodiment of the present application proposes a system for preventing eavesdropping and secret recording in a meeting, including:
  • X, N are integers greater than or equal to 1; each first transmitting module is an independent device ,
  • Each second transmitting module is an independent device;
  • the first transmitting module 501 is used to transmit one first acoustic wave signal among the N first acoustic wave signals in all directions; wherein, for each first acoustic wave signal, the first acoustic wave signal consists of a specific The signal sequence is obtained by frequency modulation, and the average amplitude of the specific signal sequence is greater than or equal to the preset threshold;
  • the second transmitting module 502 is configured to directionally transmit a second sound wave signal to one of the X audio collectors in the conference;
  • the first acoustic wave signal and the second acoustic wave signal have the same frequency and are in a frequency band that is not perceivable by humans; the second acoustic wave signal is obtained by frequency modulation of the reverse sequence; the reverse sequence is obtained according to N specific signal sequences.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • P is the transmission power of the second acoustic wave signal
  • P i is the transmission power of the i-th first acoustic wave signal
  • ⁇ is the attenuation coefficient
  • d is the transmission position of the second acoustic wave signal and the the distance between the audio acquisition
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector.
  • the reverse sequence obtained according to N specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • f(t) is the amplitude of the reverse sequence at time t
  • f i (t) is the amplitude of the i-th specific signal sequence at time t
  • t is time
  • d is the second sound wave transmit a position signal between the audio and the collector distance
  • d i is the distance between the emission position of the i-th first audio acoustic signal and the collector
  • v is the sound propagation in air speed.
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the embodiment of the present application transmits N first acoustic wave signals in all directions. Because the first acoustic wave signals are obtained by frequency modulation of a specific signal sequence, and the average amplitude of the specific signal sequence is greater than or equal to the preset threshold, the meeting The possible eavesdropping and secret recording equipment has low signal-to-noise ratio when recording meeting content, and can only collect "buzzing" noise, so that the first sound wave signal shields and interferes with the possible eavesdropping and secret recording equipment in the meeting.
  • FIG. 6(a) another embodiment of the present application proposes a system for preventing eavesdropping and secret recording in a meeting, including: N shielding interference modules 601 and X noise reduction modules 602; wherein, each shielding interference module is Independent equipment, each noise reduction module is an independent equipment;
  • each interference shielding module 601 includes: a signal generation module 6011, a first acoustic modulation module 6012, and a first transmission module 6013;
  • each noise reduction module 602 includes: reverse signal generation Module 6021, a second acoustic wave modulation module 6022, and a second transmitting module 6023;
  • the signal generating module 6011 is configured to generate a specific signal sequence; wherein, the average amplitude of the specific signal sequence is greater than or equal to a preset threshold;
  • the first acoustic wave modulation module 6012 is configured to modulate a specific signal sequence into the first acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the first transmitting module 6013 is configured to transmit one first acoustic wave signal among the N first acoustic wave signals in all directions;
  • the reverse signal generating module 6021 is configured to generate the reverse sequence according to the N specific signal sequences
  • the second acoustic wave modulation module 6022 is configured to modulate the reverse sequence into the second acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the second transmitting module 6023 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the signal generation module 6011 may send a specific signal sequence to the reverse signal generation module 6021 in a wired or wireless manner.
  • FIG. 7(a) another embodiment of the present application proposes a system for preventing eavesdropping and secret recording in a meeting, including: M shielding interference modules 701 and X noise reduction modules 702; wherein, each shielding interference module is Independent equipment, each noise reduction module is an independent equipment;
  • each interference shielding module 701 includes: a signal generating module 7011, P first acoustic wave modulation modules 7012, and P first transmitting modules 7013; each noise reduction module 702 includes: Reverse signal generating module 7021, second acoustic wave modulation module 7022, and second transmitting module 7023;
  • the signal generation module 7011 is configured to generate one of the specific signal sequences; for each generated specific signal sequence, copy the specific signal sequence into P copies to obtain P specific signal sequences.
  • the first acoustic wave modulation module 7012 is configured to modulate a specific signal sequence into the first acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the first transmitting module 7013 is configured to transmit one first sound wave signal among the N first sound wave signals in all directions;
  • the reverse signal generating module 7021 is configured to generate the reverse sequence according to the N specific signal sequences
  • the second acoustic wave modulation module 7022 is configured to modulate the reverse sequence into the second acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the second transmitting module 7023 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any time is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the signal generation module 7011 may send a specific signal sequence to the reverse signal generation module 7021 in a wired or wireless manner.
  • FIG. 8(a) another embodiment of the present application proposes a system for preventing eavesdropping and secret recording in a conference, including: M shielding interference modules 801 and X noise reduction modules 802; wherein each shielding interference module It is an independent device, and each noise reduction module is an independent device;
  • each interference shielding module 801 includes: a signal generation module 8011, a first acoustic wave modulation module 8012, and P first transmitting modules 8013; each noise reduction module 802 includes: reverse A signal generating module 8021, a second acoustic wave modulation module 8022, and a second transmitting module 8023;
  • the signal generating module 8011 is used to generate a specific signal sequence
  • the first transmitting module 8013 is configured to transmit one first sound wave signal among the N first sound wave signals in all directions;
  • the reverse signal generating module 8021 is configured to generate the reverse sequence according to the N specific signal sequences
  • the second acoustic wave modulation module 8022 is configured to modulate the reverse sequence into the second acoustic wave signal with a frequency in a frequency band that is not perceivable by humans;
  • the second transmitting module 8023 is used to directionally transmit a second sound wave signal to one of the X audio collectors in the conference.
  • the conference may refer to a video conference or a non-video conference.
  • performing frequency modulation means performing spectrum shifting, that is, shifting the spectrum of a specific signal sequence to a frequency band that is not perceivable by humans.
  • the specific signal sequence may be, for example, a sine sequence or a square wave sequence, or a random sequence.
  • the specific form of the specific signal sequence is not limited in the present application.
  • the transmission power of the second acoustic wave signal is:
  • generating X of the reverse sequences based on the N specific signal sequences may be generating a reverse sequence based on the N specific signal sequences, and then copying the generated reverse sequence into X Copies; or, for each reverse sequence, generate reverse sequences based on N specific signal sequences; or, generate A reverse sequences based on N specific signal sequences, and then combine the generated A reverse sequences
  • generating A reverse sequences according to N specific signal sequences means that for each reverse sequence, a reverse sequence is generated according to N specific signal sequences.
  • Generating a reverse sequence according to the N said specific signal sequences includes any one of the following:
  • N the absolute value of the amplitude of the reverse sequence and the specific signal sequence at any moment is equal, and the positive and negative are opposite;
  • the frequencies that are not perceivable by humans include any one or more of the following: 0-20 Hz, and above 20 kHz.
  • the signal generation module 8011 may send a specific signal sequence to the reverse signal generation module 8021 in a wired or wireless manner.
  • a system for preventing eavesdropping and secret recording in the meeting ie, the anti-tampering system in the figure
  • the anti-tampering system in the figure is arranged in the meeting.
  • multiple shielding interference modules, a noise reduction module, and an audio collector are arranged in the meeting.
  • the noise reduction module is bound to the audio collector, and the noise reduction module is directed toward the audio collection
  • the device emits a second sound wave signal.
  • each noise reduction module is bound to an audio collector, and the noise reduction module
  • the second sound wave signal is directionally transmitted to the audio collector with the binding relationship.
  • Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium).
  • the term computer storage medium includes volatile and non-volatile data implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Sexual, removable and non-removable media.
  • Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or Any other medium used to store desired information and that can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media. .

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Abstract

本申请实施例公开了一种会议中防窃听偷录的方法、装置和系统，所述方法包括以下任意一个或多个步骤：全方位发射N个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；N为大于或等于1的整数；向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到；X为大于或等于1的整数。

Description

一种会议中防窃听偷录的方法、装置和系统
相关申请的交叉引用
本申请基于申请号为201910824237.4、申请日为2019年9月2日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本申请。
技术领域
本申请实施例涉及但不限于通信领域和视频会议技术，尤指一种会议中防窃听偷录的方法、装置和系统。
背景技术
视频会议设备的广泛应用给使用者带来了极大的便利，同时使用者根据具体的使用场景又对设备本身提出了新的需求，其中会议内容的安全保密就是一个亟待解决的问题。目前针对会议内容的保密通常靠人力来实现，即需要相关人员事先对会场安全情况进行排查，但随着科技的发展，窃听偷录设备越来越小，越来越隐蔽，人力排查很难保证会场的安全保密。
发明内容
本申请实施例提供了一种会议中防窃听偷录的方法、装置和系统。
本申请实施例提供了一种会议中防窃听偷录的方法，包括以下任意一个或多个步骤：全方位发射N个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；N为大于或等于1的整数；向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到；X为大于或等于1的整数。
本申请实施例提供了一种会议中防窃听偷录的装置，包括处理器和计算机可读存储介质，所述计算机可读存储介质中存储有指令，当所述指令被所述处理器执行时，实现上述任一种会议中防窃听偷录的方法。
本申请实施例提供了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现上述任一种会议中防窃听偷录的方法的步骤。
本申请实施例提供了一种会议中防窃听偷录的装置，包括以下模块中的任意一个或多个：N个第一发射模块、X个第二发射模块；其中，X，N为大于或等于1的整数；其中，所述第一发射模块，用于全方位发射N个第一声波信号中的一个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；所述第二发射模块，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到。
本申请实施例提供了一种会议中防窃听偷录的系统，包括：N个第一发射模块、X个第二发射模块；其中，X，N为大于或等于1的整数；每一个第一发射模块和第二发射模块均为独立的设备；其中，所述第一发射模块，用于全方位发射N个第一声波信号中的一个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；所述第二发射模块，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到。
本申请实施例的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本申请实施例而了解。本申请实施例的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本申请实施例技术方案的进一步理解，并且构成说明书的一部分，与本申请实施例的实施例一起用于解释本申请实施例的技术方案，并不构成对本申请实施例技术方案的限制。
图1为本申请一个实施例提出的一种会议中防窃听偷录的方法的流程图；
图2为本申请另一个实施例提出的一种会议中防窃听偷录的方法的流程图；
图3为本申请另一个实施例提出的一种会议中防窃听偷录的方法的流程图；
图4为本申请另一个实施例提出的一种会议中防窃听偷录的方法的流程图；
图5为本申请另一个实施例提出的一种会议中防窃听偷录的装置的结构组成示意图；
图6(a)为本申请另一个实施例提出的一种会议中防窃听偷录的装置的结构组成示意图；
图6(b)为图6(a)中的屏蔽干扰模块和降噪模块的结构组成示意图；
图7(a)为本申请另一个实施例提出的一种会议中防窃听偷录的装置的结构组成示意图；
图7(b)为图7(a)中的屏蔽干扰模块和降噪模块的结构组成示意图；
图8(a)为本申请另一个实施例提出的一种会议中防窃听偷录的装置的结构组成示意图；
图8(b)为图8(a)中的屏蔽干扰模块和降噪模块的结构组成示意图；
图9(a)为本申请实施例会议中防窃听偷录的系统(即图中的防偷录系统)的布置示意图一；
图9(b)为本申请实施例会议中防窃听偷录的系统的布置示意图二；
图9(c)为本申请实施例会议中防窃听偷录的系统的布置示意图三。
具体实施方式
下文中将结合附图对本申请实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
参见图1，本申请一个实施例提出了一种会议中防窃听偷录的方法，包括以下任意一个或多个步骤：
步骤100、全方位发射N个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；N为大于或等于1的整数。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，N个第一声波信号可以在会议的同一位置发送，也可以在会议的不同位置发送，本申请实施例对此不作限定。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
本申请实施例使用第一声波信号作为噪声而不是使用白噪声作为噪声，是由于白噪声是通过随机序列调制生成的随机噪声，具有随机性，很难对白噪声进行有效的滤除。
步骤101、向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波 信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到；X为大于或等于1的整数。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000001
其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
在本申请实施例中，反向序列根据N个特定的信号序列得到包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000002
生成所述反向序列；
其中，f(t)为所述反向序列在t时刻的幅度，f i(t)为第i个所述特定的信号序列在t时刻的幅度，t为时间，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离，v为声音在空气中传播的速度。
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
本申请实施例通过在会议的不同位置全方位发射N个第一声波信号中的不同第一声波信号，由于第一声波信号由特定的信号序列进行频率调制得到，而特定的信号序列的平均幅度大于或等于预设阈值，使得会议上可能存在的窃听偷录设备在录制会议内容时信噪比较低，仅能采集到“嗡嗡嗡”的噪声，从而第一声波信号对会议上可能存在的窃听偷录设备进行了屏蔽干扰，排除了人为带来的漏洞，且对所有的音频采集器均有效，且无法通过后期处理分离出有效的会议内容；并且，向会议的音频采集器处定向发射第二声波信号，使得第一声波信号和第二声波信号在会议的音频采集器处相互抵消，实现了主动降噪，保证了会议的音频采集器对会议内容的顺利采集；并且，第一声波信号和第二声波信号的频率均在人类不可感知的频段内；因此，在不影响会议的正常进行，不给参会人员带来不适的情况下，提高了会议内容的保密性。
参见图2，本申请另一个实施例提出了一种会议中防窃听偷录的方法，包括以下任意一个或多个：
步骤200、生成N个特定的信号序列；对于每一个所述特定的信号序列，将所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；全方位发射N个第一声波信号；其 中，特定的信号序列的平均幅度大于或等于预设阈值，N为大于或等于1的整数。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，N个第一声波信号可以在会议的同一位置发送，也可以在会议的不同位置发送，本申请实施例对此不作限定。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
步骤201、根据N个所述特定的信号序列生成X个所述反向序列，对于每一个所述反向序列，将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同；X为大于或等于1的整数。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000003
其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000004
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
参见图3，本申请另一个实施例提出了一种会议中防窃听偷录的方法，包括以下任意一个或多 个：
步骤300、生成M个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列复制成P份得到P个所述特定的信号序列；对于每一个所述特定的信号序列，将所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；全方位发射N个第一声波信号；其中，特定的信号序列的平均幅度大于或等于预设阈值，M，P为大于或等于1的整数，且M×P＝N。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，N个第一声波信号可以在会议的同一位置发送，也可以在会议的不同位置发送，本申请实施例对此不作限定。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
步骤301、根据N个所述特定的信号序列生成X个所述反向序列，对于每一个所述反向序列，将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同；X为大于或等于1的整数。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000005
其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负 相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000006
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
参见图4，本申请另一个实施例提出了一种会议中防窃听偷录的方法，包括以下任意一个或多个：
步骤400、生成M个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；对于每一个所述第一声波信号，将所述第一声波信号复制成P份得到P个所述第一声波信号；全方位发射N个第一声波信号；其中，特定的信号序列的平均幅度大于或等于预设阈值，M，P为大于或等于1的整数，且M×P＝N。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，N个第一声波信号可以在会议的同一位置发送，也可以在会议的不同位置发送，本申请实施例对此不作限定。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
步骤401、根据N个所述特定的信号序列生成X个所述反向序列，对于每一个所述反向序列，将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同；X为大于或等于1的整数。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000007
其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序 列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000008
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
本申请另一个实施例提出了一种会议中防窃听偷录的装置，包括处理器和计算机可读存储介质，所述计算机可读存储介质中存储有指令，当所述指令被所述处理器执行时，实现上述任一种会议中防窃听偷录的方法。
本申请另一个实施例提出了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现上述任一种会议中防窃听偷录的方法的步骤。
参见图5，本申请另一个实施例提出了一种会议中防窃听偷录的装置，包括以下模块中的任意一个或多个：N个第一发射模块、X个第二发射模块；其中，X，N为大于或等于1的整数；
其中，所述第一发射模块501，用于全方位发射N个第一声波信号中的一个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；
所述第二发射模块502，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，不同第一发射模块可以位于会议的同一位置，也可以位于会议的不同位置；不同第二发射模块可以位于会议的同一位置，也可以位于会议的不同位置。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000009
其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
在本申请实施例中，反向序列根据N个特定的信号序列得到包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000010
生成所述反向序列；
其中，f(t)为所述反向序列在t时刻的幅度，f i(t)为第i个所述特定的信号序列在t时刻的幅度，t为时间，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离，v为声音在空气中传播的速度。
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
本申请实施例通过在会议的不同位置全方位发射N个第一声波信号中的不同第一声波信号，由于第一声波信号由特定的信号序列进行频率调制得到，而特定的信号序列的平均幅度大于或等于预设阈值，使得会议上可能存在的窃听偷录设备在录制会议内容时信噪比较低，仅能采集到“嗡嗡嗡”的噪声，从而第一声波信号对会议上可能存在的窃听偷录设备进行了屏蔽干扰，排除了人为带来的漏洞，且对所有的音频采集器均有效，且无法通过后期处理分离出有效的会议内容；并且，向会议的音频采集器处定向发射第二声波信号，使得第一声波信号和第二声波信号在会议的音频采集器处相互抵消，实现了主动降噪，保证了会议的音频采集器对会议内容的顺利采集；并且，第一声波信号和第二声波信号的频率均在人类不可感知的频段内；因此，在不影响会议的正常进行，不给参会人员带来不适的情况下，提高了会议内容的保密性。
参见图6(a)，本申请另一个实施例提出了一种会议中防窃听偷录的装置，包括以下模块中的任意一个或多个：N个屏蔽干扰模块601、X个降噪模块602；
其中，如图6(b)所示，每一个屏蔽干扰模块601包括：信号生成模块6011、第一声波调制模块6012和第一发射模块6013；每一个降噪模块602包括：反向信号生成模块6021、第二声波调制模块6022和第二发射模块6023；
其中，所述信号生成模块6011，用于生成一个所述特定的信号序列；其中，特定的信号序列的平均幅度大于或等于预设阈值；
所述第一声波调制模块6012，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
所述第一发射模块6013，用于全方位发射N个第一声波信号中的一个第一声波信号；
所述反向信号生成模块6021，用于根据N个所述特定的信号序列生成所述反向序列；
所述第二声波调制模块6022，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；
所述第二发射模块6023，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000011
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000012
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
在本申请实施例中，信号生成模块6011可以采用有线或无线的方式向反向信号生成模块6021发送特定的信号序列。
参见图7(a)，本申请另一个实施例提出了一种会议中防窃听偷录的装置，包括以下模块中 的任意一个或多个：M个屏蔽干扰模块701、X个降噪模块702；
其中，如图7(b)所示，每一个屏蔽干扰模块701包括：信号生成模块7011、P个第一声波调制模块7012和P个第一发射模块7013；每一个降噪模块702包括：反向信号生成模块7021、第二声波调制模块7022和第二发射模块7023；
其中，所述信号生成模块7011，用于生成一个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列复制成P份得到P个所述特定的信号序列；其中，P为大于或等于1的整数，且M×P＝N；
所述第一声波调制模块7012，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
所述第一发射模块7013，用于全方位发射N个第一声波信号中的一个第一声波信号；
所述反向信号生成模块7021，用于根据N个所述特定的信号序列生成所述反向序列；
所述第二声波调制模块7022，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；
所述第二发射模块7023，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000013
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负 相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000014
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
在本申请实施例中，信号生成模块7011可以采用有线或无线的方式向反向信号生成模块7021发送特定的信号序列。
参见图8(a)，本申请另一个实施例提出了一种会议中防窃听偷录的装置，包括以下模块中的任意一个或多个：M个屏蔽干扰模块801、X个降噪模块802；
其中，如图8(b)所示，每一个屏蔽干扰模块801包括：信号生成模块8011、第一声波调制模块8012和P个第一发射模块8013；每一个降噪模块802包括：反向信号生成模块8021、第二声波调制模块8022和第二发射模块8023；
其中，所述信号生成模块8011，用于生成一个所述特定的信号序列；
所述第一声波调制模块8012，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；对于每一个所述第一声波信号，将所述第一声波信号复制成P份得到P个所述声波信号；其中，P为大于或等于1的整数，且M×P＝N；
所述第一发射模块8013，用于全方位发射N个第一声波信号中的一个第一声波信号；
所述反向信号生成模块8021，用于根据N个所述特定的信号序列生成所述反向序列；
所述第二声波调制模块8022，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；
所述第二发射模块8023，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000015
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向 序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000016
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
在本申请实施例中，信号生成模块8011可以采用有线或无线的方式向反向信号生成模块8021发送特定的信号序列。
参见图5，本申请另一个实施例提出了一种会议中防窃听偷录的系统，包括：
N个第一发射模块501、X个第二发射模块502；其中，不同第一发射模块位于会议的不同位置；X，N为大于或等于1的整数；每一个第一发射模块为独立的设备，每一个第二发射模块为独立的设备；
其中，所述第一发射模块501，用于全方位发射N个第一声波信号中的一个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；
所述第二发射模块502，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号；
其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000017
其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
在本申请实施例中，反向序列根据N个特定的信号序列得到包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000018
生成所述反向序列；
其中，f(t)为所述反向序列在t时刻的幅度，f i(t)为第i个所述特定的信号序列在t时刻的幅度，t为时间，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离，v为声音在空气中传播的速度。
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
本申请实施例通过全方位发射N个第一声波信号，由于第一声波信号由特定的信号序列进行频率调制得到，而特定的信号序列的平均幅度大于或等于预设阈值，使得会议上可能存在的窃听偷录设备在录制会议内容时信噪比较低，仅能采集到“嗡嗡嗡”的噪声，从而第一声波信号对会议上可能存在的窃听偷录设备进行了屏蔽干扰，排除了人为带来的漏洞，且对所有的音频采集器均有效，且无法通过后期处理分离出有效的会议内容；并且，向会议的音频采集器处定向发射第二声波信号，使得第一声波信号和第二声波信号在会议的音频采集器处相互抵消，实现了主动降噪，保证了会议的音频采集器对会议内容的顺利采集；并且，第一声波信号和第二声波信号的频率均在人类不可感知的频段内；因此，在不影响会议的正常进行，不给参会人员带来不适的情况下，提高了会议内容的保密性。
参见图6(a)，本申请另一个实施例提出了一种会议中防窃听偷录的系统，包括：N个屏蔽干扰模块601、X个降噪模块602；其中，每一个屏蔽干扰模块为独立的设备，每一个降噪模块为独立的设备；
其中，如图6(b)所示，每一个屏蔽干扰模块601包括：信号生成模块6011、第一声波调制模块6012和第一发射模块6013；每一个降噪模块602包括：反向信号生成模块6021、第二声波调制模块6022和第二发射模块6023；
其中，所述信号生成模块6011，用于生成一个所述特定的信号序列；其中，特定的信号序列的平均幅度大于或等于预设阈值；
所述第一声波调制模块6012，用于将一个所述特定的信号序列调制成频率在人类不可感知的 频段内的所述第一声波信号；
所述第一发射模块6013，用于全方位发射N个第一声波信号中的一个第一声波信号；
所述反向信号生成模块6021，用于根据N个所述特定的信号序列生成所述反向序列；
所述第二声波调制模块6022，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；
所述第二发射模块6023，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000019
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000020
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
在本申请实施例中，信号生成模块6011可以采用有线或无线的方式向反向信号生成模块6021发送特定的信号序列。
参见图7(a)，本申请另一个实施例提出了一种会议中防窃听偷录的系统，包括：M个屏蔽干扰模块701、X个降噪模块702；其中，每一个屏蔽干扰模块为独立的设备，每一个降噪模块为 独立的设备；
其中，如图7(b)所示，每一个屏蔽干扰模块701包括：信号生成模块7011、P个第一声波调制模块7012和P个第一发射模块7013；每一个降噪模块702包括：反向信号生成模块7021、第二声波调制模块7022和第二发射模块7023；
其中，所述信号生成模块7011，用于生成一个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列复制成P份得到P个所述特定的信号序列；其中，P为大于或等于1的整数，且M×P＝N；
所述第一声波调制模块7012，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
所述第一发射模块7013，用于全方位发射N个第一声波信号中的一个第一声波信号；
所述反向信号生成模块7021，用于根据N个所述特定的信号序列生成所述反向序列；
所述第二声波调制模块7022，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；
所述第二发射模块7023，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000021
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负 相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000022
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
在本申请实施例中，信号生成模块7011可以采用有线或无线的方式向反向信号生成模块7021发送特定的信号序列。
参见图8(a)，本申请另一个实施例提出了一种会议中防窃听偷录的系统置，包括：M个屏蔽干扰模块801、X个降噪模块802；其中，每一个屏蔽干扰模块为独立的设备，每一个降噪模块为独立的设备；
其中，如图8(b)所示，每一个屏蔽干扰模块801包括：信号生成模块8011、第一声波调制模块8012和P个第一发射模块8013；每一个降噪模块802包括：反向信号生成模块8021、第二声波调制模块8022和第二发射模块8023；
其中，所述信号生成模块8011，用于生成一个所述特定的信号序列；
所述第一声波调制模块8012，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；对于每一个所述第一声波信号，将所述第一声波信号复制成P份得到P个所述声波信号；其中，P为大于或等于1的整数，且M×P＝N；
所述第一发射模块8013，用于全方位发射N个第一声波信号中的一个第一声波信号；
所述反向信号生成模块8021，用于根据N个所述特定的信号序列生成所述反向序列；
所述第二声波调制模块8022，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号；
所述第二发射模块8023，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号。
在本申请实施例中，会议可以是指视频会议，也可以是指非视频会议。
在本申请实施例中，进行频率调制也就是进行频谱搬移，也就是将特定的信号序列的频谱搬移到人类不可感知的频段内。
在本申请实施例中，特定的信号序列例如可以是一段正弦序列或方波序列，也可以是随机序列，本申请对特定的信号序列的具体形式不作限定。
在本申请实施例中，第二声波信号的发射功率为：
Figure PCTCN2020112620-appb-000023
在本申请实施例中，根据N个所述特定的信号序列生成X个所述反向序列可以是根据N个特 定的信号序列生成一个反向序列，再将生成的一个反向序列复制成X份；或者，对于每一个反向序列，根据N个特定的信号序列生成反向序列；或者，根据N个特定的信号序列生成A个反向序列，再将生成的A个反向序列中的每一个反向序列复制成B分，A×B＝X。
其中，根据N个特定的信号序列生成A个反向序列是指对于每一个反向序列，根据N个特定的信号序列生成反向序列。
根据N个所述特定的信号序列生成一个反向序列包括以下任意一个：
当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
当N大于或等于2时，按照公式
Figure PCTCN2020112620-appb-000024
生成所述反向序列；
在本申请实施例中，人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
在本申请实施例中，信号生成模块8011可以采用有线或无线的方式向反向信号生成模块8021发送特定的信号序列。
例如，如图9(a)所示，在会议中布置一个会议中防窃听偷录的系统(即图中的防偷录系统)。
又如，如图9(b)所示，在会议中布置多个屏蔽干扰模块、一个降噪模块和一个音频采集器，该降噪模块与音频采集器绑定，降噪模块定向向音频采集器发射第二声波信号。
又如，如图9(c)所示，在会议中步骤多个屏蔽干扰模块、多个降噪模块和多个音频采集器，每一个降噪模块与一个音频采集器绑定，降噪模块定向向具有绑定关系的音频采集器发射第二声波信号。
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些组件或所有组件可以被实施为由处理器，如数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于RAM、ROM、EEPROM、闪存或其他存储器技术、CD-ROM、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机 访问的任何其他的介质。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。
虽然本申请实施例所揭露的实施方式如上，但所述的内容仅为便于理解本申请实施例而采用的实施方式，并非用以限定本申请实施例。任何本申请实施例所属领域内的技术人员，在不脱离本申请实施例所揭露的精神和范围的前提下，可以在实施的形式及细节上进行任何的修改与变化，但本申请实施例的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (16)

  1. 一种会议中防窃听偷录的方法，包括以下任意一个或多个步骤：
    全方位发射N个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；N为大于或等于1的整数；
    向会议的X个音频采集器中的一个或一个以上音频采集器处定向发射一个第二声波信号；其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到；X为大于或等于1的整数。
  2. 根据权利要求1所述的方法，其中，其中，所述第一声波信号采用以下任一种方式生成：
    生成N个所述特定的信号序列；对于每一个所述特定的信号序列，将所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
    生成M个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列复制成P份得到P个所述特定的信号序列；对于每一个所述特定的信号序列，将所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；其中，M，P为大于或等于1的整数，且M×P＝N；
    生成M个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；对于每一个所述第一声波信号，将所述第一声波信号复制成P份得到P个所述第一声波信号；其中，M，P为大于或等于1的整数，且M×P＝N。
  3. 根据权利要求1所述的方法，其中，其中，所述第二声波信号采用以下方式生成：
    根据N个所述特定的信号序列生成X个所述反向序列，对于每一个所述反向序列，将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
  4. 根据权利要求1～3任一项所述的方法，其中，其中，所述第二声波信号的发射功率为：
    Figure PCTCN2020112620-appb-100001
    其中，P为所述第二声波信号的发射功率，P i为第i个所述第一声波信号的发射功率，α为衰减系数，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离。
  5. 根据权利要求1～3任一项所述的方法，其中，其中，所述反向序列根据N个特定的信号序 列得到包括以下任意一个：
    当N为1时，所述反向序列和所述特定的信号序列在任意时刻的幅度的绝对值相等，且正负相反；
    当N大于或等于2时，按照公式
    Figure PCTCN2020112620-appb-100002
    生成所述反向序列；
    其中，f(t)为所述反向序列在t时刻的幅度，f i(t)为第i个所述特定的信号序列在t时刻的幅度，t为时间，d为所述第二声波信号的发射位置与所述音频采集器之间的距离，d i为第i个所述第一声波信号的发射位置与所述音频采集器之间的距离，v为声音在空气中传播的速度。
  6. 根据权利要求1～3任一项所述的方法，其中，其中，所述人类不可感知的频率包括以下任意一个或多个：0-20赫兹Hz，20千赫兹kHz以上。
  7. 一种会议中防窃听偷录的装置，包括处理器和计算机可读存储介质，所述计算机可读存储介质中存储有指令，其中，当所述指令被所述处理器执行时，实现如权利要求1～6任一项所述的会议中防窃听偷录的方法。
  8. 一种计算机可读存储介质，其上存储有计算机程序，其中，所述计算机程序被处理器执行时实现如权利要求1～6任一项所述的会议中防窃听偷录的方法的步骤。
  9. 一种会议中防窃听偷录的装置，包括以下模块中的任意一个或多个：N个第一发射模块、X个第二发射模块；其中，X，N为大于或等于1的整数；
    其中，所述第一发射模块，用于全方位发射N个第一声波信号中的一个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；
    所述第二发射模块，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号；
    其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到。
  10. 根据权利要求9所述的装置，其中，还包括以下模块中的任意一个或多个：N个信号生成模块和N个第一声波调制模块；X个反向信号生成模块和X个第二声波调制模块；
    其中，所述信号生成模块，用于生成一个所述特定的信号序列；
    所述第一声波调制模块，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
    所述反向信号生成模块，用于根据N个所述特定的信号序列生成所述反向序列；
    所述第二声波调制模块，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
  11. 根据权利要求9所述的装置，其中，还包括以下模块中的任意一个或多个：M个信号生成模块和N个第一声波调制模块；X个反向信号生成模块和X个第二声波调制模块；
    其中，所述信号生成模块，用于生成一个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列复制成P份得到P个所述特定的信号序列；其中，P为大于或等于1的整数，且M×P＝N；
    所述第一声波调制模块，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
    所述反向信号生成模块，用于根据N个所述特定的信号序列生成所述反向序列；
    所述第二声波调制模块，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
  12. 根据权利要求9所述的装置，其中，还包括以下模块中的任意一个或多个：M个信号生成模块和M个第一声波调制模块；X个反向信号生成模块和X个第二声波调制模块；
    其中，所述信号生成模块，用于生成一个所述特定的信号序列；
    所述第一声波调制模块，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；对于每一个所述第一声波信号，将所述第一声波信号复制成P份得到P个所述声波信号；其中，P为大于或等于1的整数，且M×P＝N；
    所述反向信号生成模块，用于根据N个所述特定的信号序列生成所述反向序列；
    所述第二声波调制模块，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
  13. 一种会议中防窃听偷录的系统，包括：
    N个第一发射模块、X个第二发射模块；其中，X，N为大于或等于1的整数；每一个第一发射模块和第二发射模块均为独立的设备；
    其中，所述第一发射模块，用于全方位发射N个第一声波信号中的一个第一声波信号；其中，对于每一个第一声波信号，第一声波信号由特定的信号序列进行频率调制得到，特定的信号序列的平均幅度大于或等于预设阈值；
    所述第二发射模块，用于向会议的X个音频采集器中的一个音频采集器处定向发射一个第二声波信号；
    其中，第一声波信号和第二声波信号的频率相同，且在人类不可感知的频段内；第二声波信号 由反向序列进行频率调制得到；反向序列根据N个特定的信号序列得到。
  14. 根据权利要求13所述的系统，其中，还包括：N个信号生成模块和N个第一声波调制模块；X个反向信号生成模块和X个第二声波调制模块；
    其中，所述信号生成模块，用于生成一个所述特定的信号序列；
    所述第一声波调制模块，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
    所述反向信号生成模块，用于根据N个所述特定的信号序列生成所述反向序列；
    所述第二声波调制模块，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
  15. 根据权利要求13所述的系统，其中，还包括：M个信号生成模块和N个第一声波调制模块；X个反向信号生成模块和X个第二声波调制模块；
    其中，所述信号生成模块，用于生成一个所述特定的信号序列；对于生成的每一个所述特定的信号序列，将所述特定的信号序列复制成P份得到P个所述特定的信号序列；其中，P为大于或等于1的整数，且M×P＝N；
    所述第一声波调制模块，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；
    所述反向信号生成模块，用于根据N个所述特定的信号序列生成所述反向序列；
    所述第二声波调制模块，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
  16. 根据权利要求13所述的装置，其中，还包括：M个信号生成模块和M个第一声波调制模块；X个反向信号生成模块和X个第二声波调制模块；
    其中，所述信号生成模块，用于生成一个所述特定的信号序列；
    所述第一声波调制模块，用于将一个所述特定的信号序列调制成频率在人类不可感知的频段内的所述第一声波信号；对于每一个所述第一声波信号，将所述第一声波信号复制成P份得到P个所述声波信号；其中，P为大于或等于1的整数，且M×P＝N；
    所述反向信号生成模块，用于根据N个所述特定的信号序列生成所述反向序列；
    所述第二声波调制模块，用于将所述反向序列调制成频率在人类不可感知的频段内的所述第二声波信号。
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