JP2013195750A - Voice encryption device, voice system, and voice encryption method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel voice encryption device and the like in which attention is paid to encrypting soundwave, which is aerial vibration.SOLUTION: A voice encryption device 2 includes: a voice reception section 21 for receiving a voice belonging to an audible range; a mute section 22 for muting the voice received by the voice reception section 21 by converting the received voice to voice of a phase opposite to that of the received voice; an encryption section 23 for encrypting the voice received by the voice reception section 21 to voice belonging to an audible range other than that to which the received voice belongs; and a voice transmission section 24 for mixing the voice received by the voice reception section 21, the muted voice of an opposite phase, and the encrypted voice belonging to another audible range so as to transmit it.

Description

  The present invention relates to a voice encryption device, a voice system, and a voice encryption method.

  As a method for encrypting sound, for example, when a telephone or a computer system transmits sound using a network, a method is generally known in which sound is treated as digital data and the digital data is encrypted. By encrypting the digital data, even if a third party obtains the digital data, the voice content cannot be understood without knowing the decryption means.

  On the other hand, the voice in an actual normal conversation, not a telephone or a computer system, is a sound wave itself and propagates through the space (in the air) between the person who heard the voice and the person who listened to the voice. It is easy to understand the audio content. For this reason, voices in situations where it is not desirable to be known by a third party, such as voices made during a meeting that discusses confidential matters, or voices that emit information containing personal information in public places, There is a high possibility that it will lead to problems such as confidential matters and leakage of personal information.

JP 2005-250389 A International Publication No. 05/067340 Japanese Patent Application Laid-Open No. 05-293128

  However, as a technique in which the content of a call (audio content) is not known to a third party in a normal conversation, the method of encrypting the converted digital data after converting the audio into digital data is the third method as described above. It may not be possible to deal with situations where it is undesirable to be known to the person. Also, for example, in order to fundamentally deal with the type of wiretapping from the air vibration transmitted to the structure (window, etc.) of the venue where the conversation is taking place, such as laser eavesdropping, the sound wave itself as air vibration means It is necessary to convert to something that does not do, but there has never been a technique to convert in this way.

  Therefore, in view of such circumstances, an object of the present invention is to provide a new speech encryption apparatus, speech system, and speech encryption method that focus on encrypting sound waves as air vibrations.

  The voice encryption device according to the present invention includes a voice receiving unit that receives a sound in an audible range, a mute unit that converts the sound received by the voice receiving unit into a voice having an opposite phase to the sound, and the sound receiving unit. An encryption unit that converts and encrypts the audio received by the unit into audio of another audible range of the audio, the audio received by the audio receiving unit, the muted anti-phase audio, and the encrypted And a voice transmission unit that mixes and transmits voices in different audible ranges.

  The speech system according to the present invention is a speech system including a speech encryption device and a speech decryption device, wherein the speech decryption device receives a speech in an audible range, and the speech reception unit receives the speech. A silencer that converts the sound that has been converted into a sound having an opposite phase to the sound and silences, and an encryption unit that converts the sound received by the sound reception unit into a sound in another audible range of the sound and encrypts the sound, A voice transmission unit configured to mix and transmit the voice received by the voice reception unit, the muted voice in opposite phase, and the encrypted voice in another audible range, and the voice decoding device includes: A voice receiving unit for receiving the voice sent by the voice sending unit, a decoding unit for decoding the voice received by the voice receiving unit, and a voice sending unit for sending the voice decoded by the decoding unit And comprising.

  An audio decoding method according to the present invention includes a step of receiving audio in the audible range, a step of converting the received audio into audio having a phase opposite to that of the audio and muting, and converting the received audio to another audio of the audio Converting and encrypting the audio to an audible range, and mixing and transmitting the received audio, the muted anti-phase audio, and the encrypted audio of another audible range. Prepare.

  According to the voice encryption device of the present invention configured as described above, in a normal conversation, a third party cannot directly understand the meaning content intended by the speaker. The reason is that the terminal encryption apparatus according to the present embodiment includes an encryption unit in addition to the muffling unit, so that sound itself uttered through the utterance organ (speech source) does not directly make sense (air vibration). It is because it becomes.

It is a figure which shows schematic structure of the audio | voice system in this embodiment. It is a sequence diagram which shows the operation processing of the audio | voice encryption method in this embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of an audio system 100 in the present embodiment.

  As shown in FIG. 1, the speech system 100 includes a terminal encryption device 2 and a terminal decryption device 3, and a speech generated by a speaker in the terminal encryption device 2 is input (speech input 1). After the voice input 1 is encrypted, the voice encrypted in the terminal decryption device 3 is restored.

  The terminal encryption device (speech decryption device) 2 includes a speech reception unit 21, a mute unit 22, an encryption unit 23, and a speech transmission unit 24. The terminal encryption device 2 is used by being placed in the vicinity of a human voice organ or a voice source. For example, the terminal encryption device 2 can be attached to a human and is incorporated into a combination of existing headphones and a microphone. You can also.

  The voice receiving unit 21 receives a voice input (sound wave) 1 and is, for example, a microphone.

  The silencer 22 converts the voice input (sound wave) received by the voice receiver 21 into a signal and silences the signaled voice input.

  The encryption unit 23 is provided in the same terminal encryption device 2 as the mute unit 22, converts the voice input (sound wave) received by the voice reception unit 21, and encrypts the signaled voice input To do.

  Here, the silencer 22 and the encryption part 23 will be described in detail for the respective silencer method and encryption method.

  For the silencing method by the silencing unit 22, a technique similar to an existing silencing method used in an active noise canceller or a silencing speaker can be used. Briefly explaining the existing mute methods, the sound includes sounds that are meaningful in the context of all mechanisms that use voice to convey information, such as listening to music or having a normal conversation. , Referred to as “thematic speech”) and noise, environmental sounds, etc. (hereinafter referred to as “noise”) that are not meaningful in the context. For this reason, noise is picked up by a microphone, converted into a signal having an opposite phase, and the converted noise signal is output from the speaker as a sound wave simultaneously with (mixed with) the audio signal (the subject audio and noise). As a result, the total sound is a synthetic sound wave of the subject sound, raw noise, and noise converted to anti-phase, so that only the sound of the subject is the only sound wave that finally enters the human auditory organ. Equivalent to receiving.

  The silencer 22 of the present embodiment is characterized in that the above-described existing silencer method is used not for noise but for the subject voice (or the entire voice including noise). That is, the muffling unit 22 converts the subject voice into a signal and converts it into an audio signal having an antiphase.

  Further, in the encryption unit 23 of the present embodiment, as the encryption method, the same input as the existing silence method, that is, the subject speech (or the entire speech including noise) is signaled, not in antiphase, for example, The subject voice is encrypted by converting it into a voice signal in another audible range.

  The voice transmission unit 24 mixes the voice signals (voice data) processed by the muffling unit 22 and the encryption unit 23 and outputs them as sound waves, for example, a speaker. The voice transmission unit 24 includes the subject voice, the voice converted by the muffling unit 22 (the voice of the subject converted into an antiphase), and the voice converted by the encryption unit 23 (the encrypted theme). Only the sound of the encrypted subject as a result of the mixing is output to the outside as a sound wave.

  According to such a terminal encryption device 2, a voice transmitter 24 (for example, a speaker) serves as a voice organ for a speaker who wears the device, and the encrypted subject from the voice transmitter 24. Can be uttered as sound waves in the audible range, so that the sound content cannot be understood even if another person obtains the sound waves by some means. According to this method, the speaker only needs to utter at a size that can be input to the voice receiving unit 21 in a normal conversation. Therefore, the voice (sound wave) of the original subject can be transmitted to the body or the organ of the speaker. It will exist only in a very limited range, making it impossible for others to pick up the sound.

  The terminal decoding device (voice decoding device) 3 includes a voice receiving unit 31, a decoding unit 32, and a voice transmitting unit 33. The terminal decoding device 3 is used by being arranged in the vicinity of a human auditory organ. For example, the terminal decoding device 3 can be incorporated in an existing headphone so that it can be worn by a human.

  The sound receiving unit 31 receives sound waves output from the terminal encryption device 2 (encrypted theme sound or sound waves including encrypted theme sound and noise such as environmental sound) as input. For example, a macrophone.

  The decoding unit 32 decodes the audio signal by converting the sound wave received by the audio receiving unit 31 into a signal and performing inverse conversion of the conversion used in the encryption method.

  The audio transmission unit 33 transmits the audio decoded by the decoding unit 32 as an audible sound wave, and is an existing speaker, for example. The sound wave transmitted from the sound transmitting unit 33 is input to the human auditory organ.

  As described above, according to the audio system 100 of the present embodiment, for example, by attaching the terminal encryption device 2 and the terminal decryption device 3 to two parties having a conversation, the space between the two parties is propagated. The sound wave is encrypted. For example, even in a meeting held in a conference room, the third difference in the content of the meeting cannot be known by ordinary wiretapping to pick up the sound wave. In addition, air vibrations transmitted to a structure (generally, a window or the like) at a target venue for wiretapping methods that do not use a sound wave receiver, such as laser wiretapping, are also generated by sound waves themselves being encrypted. For this reason, even if the air vibration itself can be acquired, the contents cannot be known, which is meaningless. Further, for example, when the content of the conference is recorded, a third party who does not have the terminal decryption device 2 may know the content of the conference even if the recorded recording medium is lost (lost or stolen). Can not.

  Next, the operation processing of this embodiment will be described in detail with reference to the sequence diagram shown in FIG. In the following, a case where the speaker A occurs for the listener B will be described as an example.

  First, the speaker A puts the terminal encryption device 2 on his / her speech organ and speaks. The terminal encryption device 2 receives the utterance by the voice receiving unit 21 (step A1).

  The voice receiver 21 sends the received voice (voice data) to the silencer 22 (step A2). The muffling unit 22 calculates (silences) audio data having a phase opposite to that of the audio data received from the audio reception unit 21 (step A3), and sends the audio data to the audio transmission unit 24 (step A4).

  In addition, the voice reception unit 21 sends the voice data to the encryption unit 23 synchronously or asynchronously with the received voice data sent to the silencer 22 (step A5). The encryption unit 23 converts (encrypts) the audio data received by the audio reception unit 21 into another data (step A6), and sends it to the audio transmission unit 24 (step A7).

  The voice transmitting unit 24 utters the synthesized (audible range) voice data received from the muffling unit 22 and the encryption unit 23 as a sound wave (step A8).

  Next, the voice reception unit 31 of the terminal decoding device 3 attached to the auditory organ of the listener B receives the sound wave uttered by the voice transmission unit 24 and sends it to the decoding unit 32 as voice data (step A9). The decoding unit 32 decodes the audio data into audio data in the audible range (step A10) and sends the audio data to the audio transmission unit 33 (step A11).

  The voice transmitting unit 33 utters the decoded voice data as a sound wave (step A12). The auditory organ of the listener B can receive the uttered sound wave.

  According to the speech encryption method of the present embodiment as described above, for example, in a normal conversation, a third party cannot directly understand the meaning content intended by the speaker. The reason is that the terminal encryption apparatus according to the present embodiment includes the encryption unit 23 in addition to the muffling unit 22, so that the sound itself uttered through the speech organ (speech source) does not directly make sense. Vibration). That is, almost all spoken languages used all over the world have a mechanism that represents a semantic concept that can be identified by humans by a combination of sound waves emitted by the above-described human vocalization mechanism. In a conversation using the voice encryption method, there is almost no means for a third party to directly know the meaning content intended by the speaker. As a result, according to the voice encryption method of the present embodiment, it is possible to control data outside the range protected by the conventional encryption method (such as voice data on the network).

<Modification>
The preferred embodiments of the present invention have been described above. However, the present invention should not be limited to the above embodiments, and does not depart from the spirit and scope expressed in the claims. Various modifications, additions, and omissions are possible by those skilled in the art.

  For example, in the above-described embodiment, the terminal encryption device 2 and the terminal decryption device 3 are provided with each unit according to the application, but each of the units provided therein is configured with some of them together. Alternatively, one part may be further divided into a plurality of parts.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

  (Supplementary note 1) A sound receiving unit that receives sound in the audible range, a muffling unit that converts sound received by the sound receiving unit into sound having an opposite phase to the sound and mute, and sound received by the sound receiving unit An encryption unit that converts the voice into another audible voice and encrypts the voice, the voice received by the voice receiving unit, the muted anti-phase voice, and the other audible voice encrypted A voice encryption device comprising: a voice transmission unit that mixes and transmits the voices.

  (Additional remark 2) It is an audio | voice system containing an audio | voice encryption apparatus and an audio | voice decoding apparatus, Comprising: The said audio | voice decoding apparatus is the audio | voice receiving part which receives the audio | voice of an audible area, and the audio | voice which the said audio | voice receiving part received. A silencer that converts the sound into an opposite phase of the sound and silences the sound, an encryption unit that converts the sound received by the sound reception unit into sound of another audible range and encrypts the sound, and the sound reception A voice transmission unit that mixes and transmits the sound received by the unit, the muted voice in opposite phase, and the encrypted voice in another audible range, and the voice decoding device includes: A voice receiving unit that receives the voice transmitted by the transmission unit, a decoding unit that decodes the voice received by the voice receiving unit, and a voice transmission unit that transmits the voice decoded by the decoding unit; A voice system.

  (Supplementary note 3) The speech encryption apparatus according to supplementary note 1 or supplementary note 2, which can be mounted in the vicinity of a human vocal organ or a speech source.

  (Additional remark 4) The audio | voice encryption apparatus of Additional remark 2 which can be mounted | worn with a human auditory organ.

  (Additional remark 5) The step which receives the audio | voice of an audible range, The step which converts the said received audio | voice into the audio | voice of the antiphase of the said audio | voice, and mute, The said received audio | voice is made into the audio | voice of another audible region of the said audio | voice. Converting and encrypting, and mixing and transmitting the received sound, the muted anti-phase sound, and the encrypted sound in another audible range. .

  DESCRIPTION OF SYMBOLS 1 ... Voice input, 2 ... Terminal encryption apparatus (voice encryption apparatus), 3 ... Terminal decryption apparatus (voice decryption apparatus), 21 ... Voice reception part, 22 ... Silencer part, 23 ... Encryption part, 24 ... Voice transmitting unit, 31... Voice receiving unit, 32... Decoding unit, 33.

Claims (5)

An audio receiver for receiving audio in the audible range;
A muffler that converts the sound received by the sound receiver into sound having an opposite phase to the sound and mute,
An encryption unit that converts the sound received by the sound receiving unit into sound of another audible range of the sound and encrypts the sound;
A voice transmission unit that mixes and transmits the voice received by the voice reception unit, the muted opposite phase voice, and the encrypted voice of another audible range;
A voice encryption device comprising: An audio system including an audio encryption device and an audio decryption device,
The speech decoding apparatus comprises:
An audio receiver for receiving audio in the audible range;
A muffler that converts the sound received by the sound receiver into sound having an opposite phase to the sound and mute,
An encryption unit that converts the sound received by the sound receiving unit into sound of another audible range of the sound and encrypts the sound;
A voice transmission unit configured to mix and transmit the voice received by the voice reception unit, the muted opposite phase voice, and the encrypted voice of another audible range,
The speech decoding apparatus comprises:
A voice receiving unit for receiving the voice sent by the voice sending unit;
A decoding unit for decoding the voice received by the voice receiving unit;
An audio system comprising: an audio transmission unit that transmits the audio decoded by the decoding unit.   The speech encryption device according to claim 1, wherein the speech encryption device can be mounted in the vicinity of a human vocal organ or a speech source.   The speech encryption apparatus according to claim 2, which can be attached to a human auditory organ. Receiving audio in the audible range;
Converting the received voice to a voice having an opposite phase to the voice and muting the voice;
Converting and encrypting the received voice into another audible voice of the voice; and
Mixing the received audio, the muted anti-phase audio, and the encrypted other audible audio; and
A voice encryption method comprising: