JP2008227682A - Sound pick-up device and electronic certificate acquisition system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound emission/pick-up device that requires no reader, or the like, of an external storage medium, fetches a server electronic certificate easily, and has at least a sound pick-up device, and to provide a system for acquiring server certificate. <P>SOLUTION: A mobile communication terminal 3 downloads the server electronic certificate in a digital data format from a server 2 by using a secure WAP102. The mobile communication terminal 3 converts the server electronic certificate in a digital data format into sound for emitting toward the sound emission/pick-up device 1. The sound emission/pick-up device 1 acquires the server electronic certificate in a digital data format for analyzing sound. The sound emission/pick-up device 1 restores the server electronic certificate in a digital sound format for storage. The server electronic certificate in a digital data format acquired by the sound emission/pick-up device 1 is verified on the server 2. When the server electronic certificate is certified, a secure communication path is established by a network 101 between the sound emission/pick-up device 1 and the server 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sound collection device that forms a secure network with a server and communicates an audio signal, and an electronic certificate acquisition system that acquires an electronic certificate of a server using the sound collection device.

Currently, various systems for performing an audio conference between a plurality of remote sites are disclosed. Such a conventional audio conference system has a configuration in which an audio conference apparatus installed at each site is connected to a server on a network. A conventional audio conference system realizes an audio conference by transmitting and receiving audio signals via a server. At this time, a secure communication network is established in order to prevent unauthorized intrusion into the network such that the contents of the audio conference are heard by a third party. As a method of configuring a secure communication network, there is an SSL-VPN method, and in this method, each voice conference apparatus must form an SSL-VPN with a server. In this case, in order to identify that the own apparatus is a server to be connected to, the electronic certificate of the server must be acquired and imported into the audio conference apparatus. As a method for obtaining such an electronic certificate and importing it into an audio conference device, a method of downloading an electronic certificate to an external storage medium and causing the audio conference device to read the external storage medium storing the electronic certificate is generally used. Many are used (for example, refer patent document 1).
Japanese Patent Laid-Open No. 2002-041461

In the above-described method, a voice reading apparatus for reading an external storage medium must be provided or connectable.
However, when space saving is required for the audio conference apparatus, it is difficult to incorporate an external storage medium reading apparatus. Further, when connecting a reading device, it is necessary to align or connect the reading devices only for taking in an electronic certificate.

  Accordingly, an object of the present invention is to provide a sound emission and collection device having at least a sound collection device that can easily capture a server electronic certificate without requiring an external storage medium reading device and the like, and acquisition of a server certificate. To provide a system.

  The present invention relates to a sound collection device comprising: sound collection means for collecting sound from the surroundings of its own device to generate a sound collection signal; and communication means for connecting the network to the server and transmitting the sound collection signal to the server. It is about. The sound collection device of the present invention is characterized by comprising selection means for selecting a communication mode for transmitting a sound collection signal to a server and an electronic certificate acquisition mode for acquiring an electronic certificate from the sound collection signal. This sound collection device is characterized by comprising an electronic certificate acquisition means for analyzing a sound collection signal by voice and acquiring an electronic certificate when the electronic certificate acquisition mode is selected.

  In this configuration, the electronic certificate is picked up as sound by the sound pickup means. The collected voice is restored from the voice format to the data format digital certificate by the electronic certificate acquisition means. As a result, the electronic certificate is read using the sound collection means originally provided in the sound collection device.

  The present invention also relates to an electronic certificate acquisition system including the sound collecting device described above. An electronic certificate acquisition system including a sound collection device according to the present invention includes an electronic certificate download unit that downloads an electronic certificate from a server, and an audio format electronic certificate that converts the downloaded electronic certificate into an audio format and emits sound. The portable communication terminal further includes a sound emitting means.

  In this configuration, a portable communication terminal is used as means for emitting sound to the sound collection device. The mobile communication terminal activates application software embedded in the mobile communication terminal, downloads an electronic certificate in a digital data format from the server, converts it into a sound format, and emits the sound. Thereby, the electronic certificate of the server is provided to the sound collection device in a voice format.

  In addition, the electronic certificate acquisition system of the present invention is characterized in that an electronic certificate in an audio format is generated by forming data based on a difference in sound pressure.

  In this configuration, the digital certificate in the digital data format can be restored from the digital certificate in the audio format by acquiring sounds at predetermined time intervals and restoring the data according to each sound.

  The electronic certificate acquisition system according to the present invention is characterized in that an electronic certificate in an audio format is generated by setting different data for each single note having a different pitch.

  In this configuration, for example, the pitch “do (C)” is set to “1” of the data bit, and the pitch “fa (F)” is set to “0” of the data bit. Set different data. Thereby, the electronic certificate acquisition means can restore the digital certificate in the digital data format by detecting the pitch.

  The electronic certificate acquisition system according to the present invention is characterized in that an electronic certificate in an audio format is generated by setting different data for each of different chords.

  In this configuration, different data is set for each chord, for example, “C code” is set to “1” of the data bit and “F code” is set to “0” of the data bit. Thereby, the electronic certificate acquisition means can restore the electronic certificate in the digital data format by detecting the chord. Furthermore, by using chords, voice format data cannot be easily imitated, so security is further improved.

The electronic certificate acquisition system according to the present invention is characterized in that an electronic certificate in an audio format is generated by setting different data for each of different rhythms.

  In this configuration, for example, a rhythm for each measure is formed by using a whole note, a half note, a quarter note, an eighth note, or the like, with every 4/4 time measure as a delimiter of digital data. Each rhythm is set with different multi-bit digital data, and the multi-bit digital data can be restored by detecting the rhythm of each measure. Thereby, data conversion is performed more effectively, and even more complicated data can be voiced and restored.

  According to the present invention, the server's electronic certificate can be taken into the audio conference apparatus including the sound collection apparatus by a simple method that does not bother the user. Thereby, it is possible to realize voice communication and voice conference including a secure communication network by a simple method.

An electronic certificate acquisition system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing the main configuration of the electronic certificate acquisition system of this embodiment.
The electronic certificate acquisition system of this embodiment includes a sound emission and collection device 1, a server 2, and a mobile communication terminal 3. The sound emission and collection device 1 and the server 2 are installed at each separated point. For example, the server 2 is installed in a head office building or the like of a company having a plurality of branches throughout the country, and the sound emission and collection device 1 is installed in a conference room of the plurality of branches. The sound emitting and collecting apparatus 1 and the server 2 are set so that they can be connected by the network 101 using the SSL-VPN protocol if electronic certificate verification processing is performed in the initial communication state. The server 2 and the mobile communication terminal 3 are set in an environment in which the mobile communication terminal 3 can download various data from the server 2 by the WAP 102. The mobile communication terminal 3 is possessed by any of the users who use the sound emitting and collecting apparatus 1 and emits sound based on the server electronic certificate in the digital data format downloaded from the server 2 toward the sound emitting and collecting apparatus 1. . The sound emission and collection device 1 includes a microphone (in this embodiment, a microphone array), collects a voice server electronic certificate, and restores it to a digital data format. Obtain an electronic certificate.

  Hereinafter, the electronic certificate acquisition system of the present embodiment will be described in more detail with reference to FIGS.

(A) Sound emission and collection device 1
FIG. 2 is a block diagram showing the main configuration of the sound emitting and collecting apparatus 1 shown in FIG.
The sound emission and collection device 1 includes a control unit 10, an input / output I / F 11, a sound emission control unit 12, a sound collection control unit 13, an echo canceller 14, a voice-data conversion unit 15, a storage device 16, an operation unit 17, and a plurality of A microphone array including microphones MIC101 to MIC116 and MIC201 to MIC216 and a speaker array including a plurality of speakers SP1 to SP16 are provided.

  The control unit 10 performs overall control of the sound emission and collection device 1 and performs signal control corresponding to the selected mode on each unit of the sound emission and collection device 1. When detecting that the electronic certificate acquisition mode is set, the control unit 10 controls the sound collection control unit 13 and the voice-data conversion unit 15 to perform electronic certificate acquisition control. Further, when detecting the network communication initial setting mode, the control unit 10 controls the input / output I / F 11 and performs collation control of the server electronic certificate acquired by sound collection with the server 2. When the control unit 10 detects that the audio conference mode is set, the control unit 10 controls the sound collection control unit 13 and the input / output I / F 11 to transmit the sound collection data to the server 2 via the network 101. Take control.

  In the electronic certificate acquisition mode, the input / output I / F 11 transmits the electronic certificate verification request data from the control unit 10 to the server 2 of the network 101 and transmits the electronic certificate verification data from the server 2 to the control unit 10. give. In the voice conference mode, the input / output I / F 11 converts the sound collection beam signal input from the sound collection control unit 13 via the echo canceller 14 into sound collection data composed of the protocol of the network 101, and sends it to the server 2. Send. In the voice conference mode, the input / output I / F 11 converts sound emission data received via the network 101 into a sound emission sound signal having a predetermined sound signal format, and provides the sound emission control unit 12 with the sound emission data.

  The sound emission control unit 12 generates speaker driving signals to be given to the speakers SP1 to SP16 of the speaker array based on the sound emission sound signals from the input / output I / F 11, and outputs the signals to the speakers SP1 to SP16. The speakers SP1 to SP16 emit sound according to the given speaker driving signal. In the present embodiment, an example in which the sound emission control unit 12 and the speakers SP1 to SP16 are provided has been described. However, an apparatus that performs only sound collection by performing sound emission by another apparatus is also conceivable. In the case of the device, the sound emission control unit 12 and the speakers SP1 to SP16 may be omitted.

  The microphones MIC101 to MIC116 and MIC201 to MIC216 of the microphone array are arranged and arranged at predetermined intervals on the side wall along the longitudinal direction of the sound emitting and collecting apparatus 1 shown in FIG. At this time, microphones MIC101 to MIC116 are arranged on one side wall, and microphones MIC201 to MIC216 are arranged on the other side wall facing each other.

  The sound collection control unit 13 forms a plurality of sound collection beam signals having directional centers at different directions based on the individual sound collection signals collected by the microphones MIC101 to MIC116 and MIC201 to MIC216. Then, the sound collection control unit 13 selects the highest-level sound collection beam signal and outputs it to the echo canceller 14 in the audio conference mode, and outputs it to the audio-data conversion unit 15 in the electronic certificate acquisition mode.

  The echo canceller 14 includes an adaptive filter and a post processor, generates a pseudo regression sound signal based on the sound emission signal, and subtracts the pseudo regression sound signal from the sound collection beam signal MB, thereby outputting an output sound collection beam signal. Is generated. The generated sound pickup beam signal for output is given to the input / output I / F 11.

  The voice-data conversion unit 15 has a function of detecting pitches, chords, rhythms, and the like, and restores and converts the server digital certificate in a voice format set by a method described later into a digital data format. Part 10 is given.

  The storage device 16 stores various execution programs and the like, and also stores a server electronic certificate restored to a digital data format, a secret key, a public key, and a common key used for SSL-VPN communication.

  The operation unit 17 includes various operators and a display unit, receives a mode setting input from the user, and gives the control unit 10.

(B) Server 2 and mobile communication terminal 3
FIG. 3 is a block diagram showing the main configuration of the server 2 and the mobile communication terminal 3 shown in FIG.
(B-1) Server 2
The server 2 includes a control unit 20, a communication control unit 21, and a storage device 22.

  When the control unit 20 performs overall control of the server 2 and receives a server electronic certificate acquisition request from the mobile communication terminal 3 or an electronic certificate verification request from the sound emission and collection device 1, the control unit 20 performs server electronic processing in a digital data format. The certificate is read from the storage device 22 and given to the communication control unit 21. In addition, the control unit 20 issues a common key when forming an SSL-VPN network.

  The communication control unit 21 controls WAP and SSL-VPN communication. More specifically, when the mobile communication service provider 121 having the antenna 122 receives a WAP electronic certificate acquisition request from the mobile communication terminal 3, the electronic certificate acquisition request is sent from the mobile communication service provider 121 to the communication control unit 21. Given. The communication control unit 21 gives an electronic certificate acquisition request to the control unit 20. Then, the communication control unit 21 transmits the server electronic certificate from the control unit 20 to the mobile communication terminal 3 via the network 101 and the mobile communication service provider 121. Further, the communication control unit 21 receives the electronic certificate verification request from the sound emitting and collecting apparatus 1 and transmits the server electronic certificate from the control unit 20 to the sound emitting and collecting apparatus 1. In addition, when the communication control unit 21 acquires a communication request by the SSL-VPN method from each sound emitting and collecting apparatus connected to the network 101, an SSL-VPN network is formed for each sound emitting and collecting apparatus. At this time, the communication control unit 21 transmits the common key formed by the control unit 20 to each sound emitting and collecting device via the network 101.

  The storage device 22 stores the server electronic certificate and the common key issued by the control unit 20.

(B-2) Mobile communication terminal 3
The mobile communication terminal 3 is a so-called general mobile phone terminal or the like, and includes a control unit 30, a transmission / reception unit 31, a sound collection AMP32, a sound emission AMP33, an antenna 34, a microphone 35, a speaker 36, a display unit 37, an operation unit 38, A memory 39 is provided. Note that description of functions of a general mobile phone terminal is omitted, and only a part that is a feature of the present invention will be described.

  When the user inputs a server electronic certificate issuance request through the operation unit 38, the control unit 30 activates the server electronic certificate issuance request application software and gives the server electronic certificate request to the transmission / reception unit 31. When the control unit 30 receives the server electronic certificate in the digital data format from the transmission / reception unit 31, the control unit 30 stores it in the memory 39. In addition, when the user inputs the voice output of the server electronic certificate by the operation input of the operation unit 38, the control unit 30 reads the server digital certificate in the digital data format from the memory 39, converts it into the voice format, and outputs the sound. Give to AMP33.

  The transmission / reception unit 31 performs communication control with the mobile communication service provider 121 and uses the antenna 34 to control transmission of a server electronic certificate issuance request and downloading of a server electronic certificate in a digital data format.

  When the sound emission AMP 33 receives the server electronic certificate in the audio format from the control unit 30, the sound emission AMP 33 amplifies it to a predetermined level and emits the sound from the speaker 36.

  The operation unit 38 includes various operators and accepts a request for issuing a server electronic certificate and an operation input for voice output of the server electronic certificate. At this time, various operation menus are displayed on the display unit 37.

  The memory 39 stores various programs including electronic certificate acquisition request application software, and also stores the downloaded server electronic certificate in digital data format.

Next, a system flow for obtaining an electronic certificate will be described with reference to FIGS.
FIG. 4 is a diagram showing a system flow for obtaining an electronic certificate.
FIG. 5 is an explanatory diagram showing an example of setting the voice format and digital data format of the server electronic certificate.

  A user who uses the sound emission and collection device 1 operates his / her portable communication terminal 3 to activate server electronic certificate issuance request application software (S301). The mobile communication terminal 3 transmits a request for issuing a server electronic certificate to the server 2 via the WAP (S302). At this time, the WAP is maintained in a secure state by a known technology by the mobile communication service provider 121.

  When the server 2 receives the server electronic certificate issuance request (S201), it issues a digital data format server electronic certificate and transmits it to the mobile communication terminal 3 via WAP (S202).

  When the mobile communication terminal 3 receives the server electronic certificate in the digital data format (S303), it stores it in the memory 39 (S304).

  A user who uses the sound emitting and collecting apparatus 1 brings the mobile communication terminal 3 storing the server electronic certificate to the vicinity of the sound emitting and collecting apparatus 1 and performs an operation for outputting the sound of the server electronic certificate. The portable communication terminal 3 accepts the voice output operation of the server electronic certificate (S305), reads the digital certificate in the digital data format from the memory 39, and converts it into a voice format using various formats as shown in FIG. To do. The server electronic certificate converted into the voice format is emitted from the speaker 36 (S306).

  Here, the conversion pattern between the digital data format and the audio format will be described with reference to FIG. FIGS. 5A to 5C are diagrams showing an example in which 1-bit data is assigned to a single tone and a chord. When (A) uses a single tone, (B) uses a chord, ) Indicates the state of 1-bit data corresponding to a single tone and a chord.

  In the example of FIGS. 5A and 5C, the case where a single note “do” is set to “1” of 1-bit digital data and a single note “fa” is set to “0” of 1-bit digital data. Show. In such a setting, the mobile communication terminal 3 reads the digital data sequence “1, 0, 0, 1, 1, 1, 0” of the server electronic certificate as shown in FIG. From the speaker 36, “DO, FA, FA, DO, DO, DO, FA” are emitted in order at predetermined intervals.

  In the example of FIGS. 5B and 5C, the C code is “1” of 1-bit digital data and the F code is “0” of 1-bit digital data. As shown in FIG. 5C, when the digital data string “1, 0, 0, 1, 1, 1, 0” is read out, “C, F, F, C, C, C, F” is output from the speaker 36. Are sequentially emitted at predetermined intervals.

  In the above description, an example in which pitches and chords are associated with 1-bit data has been shown. However, as shown in FIGS. 5D and 5E, the generated sound is divided into bars and a plurality of bar units are provided. You may make it respond | correspond to a bit. For example, FIGS. 5D and 5E show an example in which one bar of 4/4 time is associated with 4-bit data. In this case, the pitch is constant (in the example of this embodiment, “La”), and 4-bit data is represented by a combination of a rhythm, that is, a whole note, a half note, a quarter note, and an eighth note. In the example of FIGS. 5D and 5E, only all notes correspond to “0000” of the 4-bit data, and the combination of the order of the half note, the eighth note, the eighth note, and the quarter note is “0110”. Corresponding to In such a setting, when the mobile communication terminal 3 reads the digital data string of the server electronic certificate stored in the memory 39, the mobile communication terminal 3 emits sound according to a predetermined tempo at a rhythm corresponding to the digital data string.

  In the above description, an example in which pitches, chords, and rhythms are used alone has been described. However, by combining these, higher-bit digital data can be expressed by sounds.

  When the sound emitting and collecting apparatus 1 receives the electronic certificate acquisition mode by the user's operation input (S101), the sound emitting and collecting apparatus 1 analyzes the sound of the server electronic certificate in the sound format collected by the microphone MIC and restores it to the digital data format ( S102 → S103). The sound emission and collection device 1 stores the server electronic certificate converted into the digital data format in the storage device 16 (S104). When receiving the network communication initial setting mode by the user's operation input, the sound emission and collection device 1 requests the server 2 to collate the server electronic certificate via the network 101. The server 2 transmits its own server electronic certificate stored in the storage device 22 to the sound emitting and collecting device 1 in response to the verification request. The sound emission and collection device 1 collates the server electronic certificate acquired via the network 101 with the server electronic certificate stored in the storage device 16 of the own device (S105 ← → S211). When the server electronic certificate of the server 2 connected to the network 101 is authenticated, the sound emitting and collecting apparatus 1 makes a request for acquiring a common key for voice communication to be used in the network 101 by using its own public key (S106). . Upon receiving the common key acquisition request (S212), the server 2 generates a common key, encrypts it with the public key, and transmits it to the sound emitting and collecting apparatus 1 (S213). When receiving the common key, the sound emission and collection device 1 decrypts it with the secret key and obtains the common key (S107). By performing such processing, a secure communication path can be reliably established between the server 2 and the sound emission and collection device 1. Then, each sound emitting and collecting apparatus connected to the server 2 performs such processing, so that each sound emitting and collecting apparatus can establish a secure communication path via the server 2.

  As described above, by using the configuration of the present embodiment, even a space-saving network communication device that is not equipped with a reading unit of an external storage device originally has a sound collecting function like a sound emitting and collecting device. If it is an apparatus, a server electronic certificate can be easily obtained. Since the server electronic certificate can be easily obtained in this way, a secure communication system can be easily established.

It is a conceptual diagram which shows the main structures of the electronic certificate acquisition system of embodiment of this invention. It is a block diagram which shows the main structures of the sound emission and collection apparatus 1 shown in FIG. It is a block diagram which shows the main structures of the server 2 and the mobile communication terminal 3 which are shown in FIG. It is the figure which showed the system flow of electronic certificate acquisition. It is explanatory drawing which showed the example of a setting of the audio | voice format of a server electronic certificate, and a digital data format.

Explanation of symbols

1- Sound emission and collection device, 10-control unit, 11-input / output I / F, 12-sound emission control unit, 13-sound collection control unit, 14-echo canceller, 15-voice-data conversion unit, 16-memory Device, 17-operation part,
2-server, 20-control unit, 21-communication control unit, 22-storage device,
3-mobile communication terminal, 30-control unit, 31-transmission / reception unit, 32-acquisition AMP, 33-sound emission AMP, 34-antenna, 35-microphone, 36-speaker, 37-display unit, 38-operation unit, 39-memory,
101-Network, 102-WAP, 121-Mobile communication service provider, 122-Antenna

Claims (6)

Sound collection means for collecting sound from the surroundings of the device and generating a sound collection signal;
A communication means for connecting the network to a server and transmitting the collected sound signal to the server;
A sound collecting device comprising:
Selecting means for selecting a communication mode for transmitting the collected sound signal to the server and an electronic certificate obtaining mode for obtaining an electronic certificate from the collected sound signal;
When the electronic certificate acquisition mode is selected, an electronic certificate acquisition unit that analyzes the collected sound signal and acquires an electronic certificate;
A sound collecting device. The sound collecting device according to claim 1,
Electronic certificate downloading means for downloading the electronic certificate from the server;
A portable communication terminal comprising: an audio format electronic certificate sound emitting means for converting a downloaded electronic certificate into an audio format and emitting the sound;
Electronic certificate acquisition system equipped with.   The electronic certificate acquisition system according to claim 2, wherein the electronic certificate in the voice format forms data based on a difference in sound pressure.   The electronic certificate acquisition system according to claim 3, wherein the electronic certificate in the voice format is formed by setting different data for each single note having a different pitch.   The electronic certificate acquisition system according to claim 3, wherein the electronic certificate in the voice format is formed by setting different data for each of different chords.   The electronic certificate acquisition system according to any one of claims 3 to 5, wherein the voice-format electronic certificate is formed by setting different data for different rhythms.

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