KR102168355B1 - Mobile for preventing leakage of call contents using hopping - Google Patents

Abstract

The present invention provides a terminal for preventing the outflow of ringtones using hopping, which prevents the outflow of the call contents to a third party by transmitting the received consonant sound output through the mobile terminal by beamforming so that the received consonant is concentrated only on the mobile terminal user About.
The terminal for preventing the outflow of a call sound according to the present invention includes a communication unit; A speaker unit spaced at a predetermined interval and including a plurality of speakers for outputting sound received through the communication unit; And a control unit that processes the sound so that the sound is concentrated at a predetermined point in front of the output direction of the speaker unit and allocates an output sound to each of the plurality of speakers.

Description

Terminal for preventing leakage of call sound using hopping {Mobile for preventing leakage of call contents using hopping}

The present invention relates to a terminal for preventing the leakage of a call sound, and in particular, by transmitting a received sound output through a mobile terminal by beamforming, the received sound is concentrated only to the mobile terminal user, thereby preventing the leakage of the call content to a third party. It relates to a terminal for preventing the leakage of a call sound using one hopping.

Recently, various types of mobile terminals have been used. These mobile terminals are generally connected to a service system like a mobile communication network to provide a voice call service to a user. Therefore, users can conveniently enjoy the call service anytime, anywhere.

Convenience by mobile terminals has increased, but the leakage of call contents is also a problem. As users make voice calls using mobile terminals, there are cases of frequent calls even where there are people other than users. In this situation, when the sound output level of the mobile terminal is above a certain level, a situation in which a nearby person unintentionally listens to a call is frequently generated. In particular, these outflows occur more frequently when making calls in public places.

However, conventionally, there are few methods for preventing the leakage of the contents of a call, and the method devised for this is complicated to realize, or it is not effective to prevent leakage.

Republic of Korea Patent Registration No. 10-0652736 (registration date 2006.11.24.) "An apparatus and method for preventing the leakage sound of a communication terminal"

Accordingly, it is an object of the present invention to prevent the outflow of phonetic sound using hopping that prevents the outflow of the content of the phone call to a third party by delivering the incoming-concept sound output through the mobile terminal by beamforming so that the incoming phonetic sound is concentrated only to the mobile terminal user It is to provide a terminal for.

In addition, another object of the present invention is to transmit the reception sound band to be beamforming by beamforming, but by changing the beamforming band by hopping so that the reception sound is concentrated only on the user and recognized as noise by a third party. Thus, it is to provide a terminal for preventing the leakage of a call sound using hopping that prevents the leakage of call contents.

In addition, another object of the present invention is to provide a terminal for preventing the outflow of the telephone sound using hopping so as to prevent the outflow of the call contents by providing a separate sound to prevent the outflow of the telephone conversation during a user's call. will be.

In order to achieve the above object, a terminal for preventing the outflow of a call sound according to the present invention includes a communication unit; A speaker unit spaced at a predetermined interval and including a plurality of speakers for outputting sound received through the communication unit; And a control unit that processes the sound so that the sound is concentrated at a predetermined point in front of the output direction of the speaker unit and allocates an output sound to each of the plurality of speakers.

The terminal for preventing the outflow of call sound using hopping according to the present invention transmits the reception sound output through the mobile terminal to the user by beamforming, so that the reception sound is concentrated only on the mobile terminal user, and the call contents to a third party through this It becomes possible to prevent this outflow.

In addition, the terminal for preventing the outflow of ringtones using hopping according to the present invention divides the reception sound band to be beamforming into a plurality of frequency bands, and hopping each frequency band to perform beamforming for the entire band or selected partial bands. By doing so, it is possible to actively prevent the leakage of the contents of a call because it is perceived as noise by a third party while allowing the user to concentrate the received phonetic sound.

In addition, the terminal for preventing the outflow of call sound using hopping according to the present invention outputs a separate sound so that the user does not recognize the received consonant sound when the user makes a call, so that a third party cannot recognize the call contents by the jamming sound. It becomes possible.

1 is a perspective view showing an example of a terminal according to the present invention.
Figure 2 is a block diagram showing an internal configuration in a block form.
3 is an exemplary view for explaining the directivity characteristics of speakers according to the present invention.
4 is an exemplary diagram for explaining a frequency band of sound, beamforming of an output sound, and outputting a jamming sound corresponding thereto.
5 is an exemplary diagram for explaining selection of a jamming sound according to beamforming of an output sound.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. It should be noted that the reference numbers indicated in the configurations in the accompanying drawings use the same reference numbers as much as possible when indicating the same configuration in other drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, certain features presented in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

1 is a perspective view showing an example of a terminal according to the present invention, and FIG. 2 is a block diagram showing an internal configuration in a block form.

1 and 2, a terminal for preventing the outflow of a call sound using hopping according to the present invention includes a speaker unit 10, a control unit 20, a communication unit 30, a storage unit 40, and a display unit 50. It consists of including.

The speaker unit 10 is spaced apart at predetermined intervals and installed in the main body 2 of the terminal 1, and outputs a received sound, which is a sound (hereinafter referred to as “original sound”) transmitted through the control unit 20. In addition, the speaker unit 10 may output jamming sound transmitted from the control unit 20 together with the output sound.

Specifically, the speaker unit 10 may be configured as a directional speaker so that the output sound transmitted by converting the original sound from the control unit 20 into an outputable form is transmitted only to the user through beamforming. Here, in FIGS. 1 to 3, a case in which three speakers 11 (11a to 11c) are formed is shown, but the number of speakers 11 can be changed. The speaker 11 outputting the output sound may be composed of a speaker that outputs the output sound through beamforming and a speaker that outputs the output sound as it is. The speaker 11 may be configured by mixing a directional speaker and an omni-directional speaker.

The speaker 11 may be composed of array speakers disposed at predetermined intervals as shown. 1 and 2 illustrate an example in which the speakers are arranged in a line, the present invention is not limited by the fact that it is suggested that the speakers may not be arranged in a line. The speaker 11 may be disposed at a predetermined angle so as to be focused at a predetermined position. The speaker 11 configured as described above serves to allow the output sound transmitted from the controller 20 to be summed at the focus and transmitted to the user as the original sound.

To this end, the output sound transmitted to each speaker 11 may be a divided sound allocated to each speaker 11 by dividing the original sound by the control unit 20. The output sound may be obtained by varying the phase of the original sound for each speaker 11 or lowering the sound pressure compared to the original sound. These phases or sound pressures are summed up at the focal position and divided to maximize.

In particular, such beamforming may be performed on some of the acoustic frequency bands of the original sound. That is, the control unit 20 divides the sound frequency band of the original sound into a plurality of bands, and outputs sound by using the output sound for a specific band among the plurality of bands as a beamforming target. This will be described in more detail below.

When the original sound is output, the speaker unit 10 may output a jamming sound to prevent a third party from recognizing the original sound, and may include an auxiliary speaker 13 for this purpose. The auxiliary speaker 13 may be arranged in a different direction than the speaker 11, for example, toward a third person's position. For example, when the speaker 11 is disposed on the front side of the main body 2 with the display screen, the auxiliary speaker 13 may be disposed on the rear side of the main body 2. The auxiliary speaker 13 may output jamming sound to an unspecified number of third parties using an omni-directional speaker, but this does not limit the present invention, and may be implemented using a directional speaker.

The control unit 20 converts the original sound input through the communication unit 30 into an output sound and transmits the converted sound to each speaker 11 of the speaker unit 10. Specifically, when the original sound is transmitted through the communication unit 30, the controller 20 divides the frequency of the original sound into a plurality of predetermined frequency bands. Then, the control unit 20 selects a frequency band according to a predetermined algorithm, and converts the original sound of the selected band using a beamforming algorithm. In this case, the control unit 20 converts the original sound of the selected band into a plurality of output sounds having a phase difference or converts the output sound having a difference in sound pressure. To this end, the controller 20 converts the original sound into an output sound using an energy-based method such as brightness control, contrast control, and gain difference control, or a least-squares method such as solution band filtering.

The control unit 20 converts the original sound of the selected band among the bands output through the speaker 11 for beamforming, and transmits the sound of the remaining bands to the speaker 11 as it is to be output.

Here, the control unit 20 changes the acoustic band in which the beamforming is performed by replacing the selected band with an unselected band among the plurality of bands, that is, hopping. For example, the control unit 20 analyzes the frequency band of the sign language when the sign language is transmitted through the communication unit 30. In addition, the controller 20 divides the analyzed frequency band into a plurality of bands according to a predetermined standard. When the frequency band of the received sound is divided into a plurality of bands, the controller 20 selects any one or a plurality of bands (N, where N is 2 to M) among the plurality of bands M as the beamforming band.

Here, the beamforming target band may be selected at random so that an arbitrary band may be selected, or a plurality of bands M may be sequentially selected. Alternatively, it is possible to vary the number of bands selected at the same time as the bands selected by a preset algorithm.

Then, the controller 20 generates output sound by performing beamforming processing on the selected band, and allocates the output sound to each speaker 11. In particular, the control unit 20 generates an output sound by changing a band to be subjected to beamforming over time. At this time, the unselected band is transmitted to the speaker 11 and output in the original sound state in which the beamforming process is not performed.

In this way, the controller 20 beamforms a partial band so that the beamforming sound and the original sound are output together. Through this, the control unit 20 allows the beamforming sound and the original sound to be mixed and transmitted to a third party, so that the reception sound is transmitted to the third party in a form of noise that is difficult to understand. In particular, the control unit 20 increases the effect of allowing the output sound to be recognized as noise by a third party by continuously changing the target band for beamforming.

Meanwhile, the control unit 20 may select a jamming sound separate from the original sound and supply it to the auxiliary speaker 13. The jamming sound is pre-stored in the storage unit 20 as a sound irrelevant to the contents of the original sound or the received sound, such as music and effect sound. Here, the jamming sound is a sound that is instantaneously generated according to a predetermined algorithm, and may be a sound that is not related to the original sound. However, when the instantaneously generated sound is used as the jamming sound, the load burden of the device including the control unit 20 may increase. However, this does not limit the present invention, and in the detailed description of the present invention, for convenience of explanation, it is assumed that the jamming sound is a sound selected and output by the control unit 20 among a plurality of pre-stored sounds. To The controller 20 may transmit the selected jamming sound to the speaker 11 to be output through the auxiliary speaker 13 while the output sound is output through the speaker 11. Through this, the third party mainly listens to the jamming sound and thus cannot concentrate on the original sound, and even when listening to the original sound, the third party hears the output sound mixed with the beamformed sound, making it difficult to recognize the call contents.

In particular, the controller 20 may analyze a frequency band of the original sound and select a jamming sound corresponding thereto. Alternatively, the controller 20 may select a jamming sound corresponding to the frequency band in which the beamforming process is performed among the original sound. This will be described in more detail below with reference to FIG. 4.

The communication unit 30 forms a communication channel with a base station of the mobile communication system, and transmits the original sound to the control unit 20.

The storage unit 40 stores a program to which an algorithm for generating an output sound is applied and a jamming sound as described above. The storage unit 40 stores a plurality of jamming sounds, and any one of them may be selected by the controller 20 and output through the auxiliary speaker 13.

Here, in the present invention, it is shown that the control unit 20 directly transmits sound to the speaker 11 and the auxiliary speaker 13, but in the actual configuration, a configuration for converting sound may be added. It can be understood that it is included in (20).

3 is an exemplary view for explaining the directivity characteristics of speakers according to the present invention.

Referring to FIG. 3, as described above, the terminal for preventing the outflow of a call sound according to the present invention is provided with a speaker 11 and an auxiliary speaker 13 configured in plural. In outputting the output sound, the speaker 11 is configured to provide a beamforming characteristic to the output sound so that a third party other than the user cannot hear the contents of the sound. To this end, the speaker 11 may be configured as a speaker having directivity, but as described above, some speakers may be configured as an omnidirectional speaker.

To this end, in the present invention, an example in which the speaker 11 outputting sound is configured in plural to improve the directivity characteristics, and an array speaker arranged at predetermined intervals is shown, but this is presented for convenience of explanation. This does not limit the present invention. In addition to the array speaker presented, an ultrasonic speaker or a speaker having a dome reflecting sound may be used. In particular, when a directional speaker is used for an array speaker, it may be more effective in realizing the object of the present invention. Hereinafter, a description will be mainly made based on an example in which the speaker 11 is configured as an array speaker.

As can be seen in FIG. 3, the speakers 11 (11a to 11c) may be disposed on the front side of the terminal body 2 at predetermined intervals. These speakers 11 are arranged to have directivity toward a predetermined point P, and may be configured using speakers having directivity toward the front to improve this.

In this way, the speaker 11 may be restored to a sound originally intended to be output by matching or collecting the phases of the output sound at the point P, or may be arranged to have a maximum sound pressure at the point P.

When the speakers 11 are composed of only these directional speakers, the directional lobes (r: r1 to r3) of each speaker 11a to 11c are virtual lines connecting the speaker 11 and the point P as shown. It has an elongated oval shape along the line. On the other hand, when an omni-directional speaker is used, a directional lobe in a circular shape including the point P is drawn.

In other words, as can be seen through the overlapping of the directional lobes (r), the phases are combined at the point (P) corresponding to the inside of the user's ear to maximize the phase value of the sound, or the sound that is leaked to the outside due to the maximum sound pressure. This will be less.

In the present invention, such beamforming is performed on some bands selected from among the target bands for beamforming divided into a plurality of bands, thereby enhancing this effect. Specifically, as described above, when the original sound is transmitted, the control unit 20 sets a band in which the reception sound is mainly distributed as a beamforming target band, and divides the band to be beamforming into a plurality of bands.

In addition, the control unit 20 selects a band to be output through the beamforming process among the plurality of bands and a band to output the received sound as it is. When the selection is made, the controller 20 performs beamforming processing for the original sound in the selected band, and generates output sound allocated to each speaker 11 without beamforming processing for the original sound in the remaining bands. do.

The band change in this manner may be performed under predetermined conditions. Specifically, the control unit 20 may change the band at predetermined time intervals. Alternatively, it is also possible to change the beamforming band to another band at a moment when a specific condition is satisfied, such as a moment when a received signal is temporarily cut off or a band in which a reception sound is mainly distributed is changed. However, changing the plurality of bands at short time intervals, for example, several times per second or more, may be advantageous in preventing the outflow of the received speech.

To this end, as described above, the controller 20 may randomly select a plurality of bands for dividing the beamforming target band and select one or more bands as the beamforming target. Alternatively, the beamforming bands may be changed in order by imposing an order on a plurality of bands. Alternatively, it is possible to select the number of bands in which beamforming is to be performed and a target band according to a predetermined algorithm. For example, the controller 20 may generate a pattern according to a predetermined algorithm, and select a specific band as a beamforming target according to the pattern. Specifically, the control unit 20 selects a pattern for sequentially or randomly selecting an odd-numbered band, a pattern for sequentially or randomly selecting an even-numbered band, and a band corresponding to a multiple of a specific number by an algorithm for generating a pattern. Like the selected pattern, a pattern for selecting a band may be generated, and a beamforming band may be selected accordingly. Such an algorithm can calculate a pattern for hopping by varying various conditions such as a time for maintaining a specific band as a beamforming band, the number of divided bands, and a width of the band. Through this, even if a third party uses the analysis device, it is possible to make it difficult to grasp the band in which beamforming is performed.

The output sound may be a mixture of a beamformed original sound and a non-beamformed original sound. That is, each of the speakers 11 may output an output sound in which the original sound beamformed and the original sound that has not been beamformed are mixed.

In contrast, when the output sound is divided into the output sound generated by the beamformed original sound and the output sound generated by the original sound without beamforming, some of the speakers 11 output the beamformed output sound. , The remaining speaker 11 may output an output sound that is not beamformed.

When the beamformed output sound and the non-beamformed output sound are transmitted to the user, the energy of the non-beamformed output sound and the energy of the beamformed output sound may have a difference.

That is, only the sound of the band in which the beamforming is formed is loud, and the sound of the remaining band is small. Therefore, the control unit 20 can adjust the output of the beamformed output sound and the output of the non-beamformed output sound so that the sound of the beamformed band and the sound of another band are transmitted to the user at the same energy level. have. Through this, it is possible to prevent deterioration of the call quality in which only some of the original sounds are loud or clear.

To this end, the controller 20 adjusts the energy level of the output sound by lowering the output of the beamformed output sound or increasing the output of the non-beamformed output sound.

When the energy level of the output sound is adjusted, the energy level of the sound transmitted to the location of the third party becomes non-uniform, making it difficult for a third party to recognize the contents of the original sound.

Meanwhile, as shown in FIG. 3, an auxiliary speaker 13 may be provided to output jamming sound. Since such jamming sound must propagate jamming sound to a space for an unspecified number, the auxiliary speaker 13 may be configured using a speaker having omni-directional characteristics. However, it may be configured using a directional speaker in consideration of the efficiency of outputting the jamming sound by the auxiliary speaker 13. In addition, a plurality of auxiliary speakers 13 may be formed, and in this case, a directional speaker and an omni-directional speaker may be mixed and configured.

4 is an exemplary diagram for explaining a frequency band of sound, beamforming of an output sound, and outputting a jamming sound corresponding thereto. 5 is an exemplary diagram for explaining selection of a jamming sound according to beamforming of an output sound.

Referring to FIG. 4, the terminal of the present invention converts original sound into output sound, and distributes the converted output sound to each speaker 11 and outputs the converted sound. In this process, the control unit 20 of the terminal generates an output sound in which the original sound and the beam-formed sound are mixed by beamforming a partial band of the original sound.

Particularly, when the original sound is input, the control unit 20 of the terminal checks the frequency bands A1-D1 of the original sound and divides it into a plurality of frequency bands A to D. Then, any one (A) of the plurality of frequency bands (A to D) is selected. In FIG. 4, a case in which one band A is selected is shown, but it is suggested that several bands can be selected, and the present invention is not limited thereto. Then, the control unit 20 beamforming the original sound of the selected band, and the remaining bands B, C, and D generate output sound that is the original sound and supply it to the speaker 11.

The process of performing beamforming in this way requires a large amount of computation. Such an operation inevitably consumes a lot of power, and is a reason for limiting the execution of other functions. All of the frequency bands of the original sound may be divided into a plurality of frequency bands, but in order to maintain effective security and reduce consumption of terminal performance, a band in which the sound of the original sound is mainly distributed may be limited as a beamforming target.

In the drawing, the frequency range f1 to f2 indicates the range of the audible frequency or the range of the output frequency of the received sound transmitted through the mobile communication system. Among them, the frequency used for human conversation is limited to a part of the output frequency range. Therefore, it is possible to perform conversion for only the sound corresponding to the frequency of the section A1 to D1, which is a partial region of the output frequency range. To this end, the frequency values of A1 and D1 may be previously stored in the storage unit 40. As a result, by performing beamforming only in a frequency band in which the received sound is mainly distributed, it is possible to perform effective security processing while preventing excessive consumption of terminal performance that may occur by beamforming an unnecessary band.

When the sound source distribution of the original sound appears as shown in FIG. 4, a frequency section of A1 to D1 is selected as a beamforming target section, and the section is divided into a plurality of frequency bands to perform beamforming processing for the selected band. do.

Then, when time elapses, the controller 20 selects another band among the remaining sections B, C, and D to perform beamforming. Likewise, when a new band is selected, the previously beamformed band is output as it is, and the newly selected band is beamformed to output the output sound.

The movement of the band is continuously performed while a call is in progress, and the period in which the band is changed may be performed according to a predetermined period, or may be performed by randomly determining the change period. Alternatively, it is possible to change the band whenever the conversation is temporarily stopped during a call.

As described above, the controller 20 may output a jamming sound using the auxiliary speaker 13. In this case, a jamming sound corresponding to the output frequency range may be output, but in this case, an unnecessary frequency band sound may be output. That is, compared to outputting sounds in other frequency ranges, outputting jamming sounds in the same frequency range as the sound in the band to be prevented from leaking is effective in preventing a third party from recognizing the sound.

Therefore, the control unit 20 may select a jamming sound in which the frequency band of the jamming sound is similar to or mainly include the frequency of the bands A1 to D1 to be beamforming, and output through the auxiliary speaker 13. In particular, when a plurality of jamming sounds are stored, a jamming sound in which the sound in the frequency band of the target region for beamforming is mainly selected and output may be performed. Through this, the frequency bands of the output sound and the jamming sound are overlapped, so that a third person cannot recognize the output sound.

Meanwhile, FIG. 5 shows another example of output of jamming sound.

Referring to FIG. 5, by selecting the output jamming sound in consideration of a band in which beamforming is performed, it is possible to more effectively prevent the outflow of sound.

In FIG. 4 described above, a method of selecting and outputting a sound including all of the beamforming target bands A1 to D1 as a jamming sound has been described. However, the output sound includes sound in which beamforming has been performed for some of the bands A1 to D1 to be beamformed (A1 to A2). Therefore, when a third party listens to other bands other than some of the beamforming-processed bands A1 to A2, that is, the non-beamforming bands A2 to D1, some contents may be recognized. It is possible to intensively prevent such leakage by jamming sound.

As shown in FIG. 5, when the sound of the band A (A1 to A2) is beamformed, the region of the band B to D (A2 to D1) is not beamformed, and the original sound is output as it is. In this case, the jamming sound may be output by selecting a sound whose frequency bands A2 to D1 dominate. That is, irrespective of whether or not the frequency of the band A in which the beamforming is performed, when the frequency band of the jamming sound mainly includes the frequencies of the regions B, C, and D, the jamming sound may be selected and output.

For example, when the C band (B1 to C1) is selected and beamforming is performed, the jamming sound is a sound that includes all the frequencies of the A, B, and D bands, or includes the frequencies of a wider band such as A and B. The sound can be selected and output as a jamming sound.

Through this, it is possible to prevent the outflow of the call sound by the jamming sound in the remaining bands outside the band in which the beamforming is performed.

Although shown and described as a specific example to illustrate the technical idea of the present invention, the present invention is not limited to the same configuration and operation as the specific embodiment as described above, and various modifications are within the scope of the present invention. Can be carried out in Therefore, such modifications should be regarded as belonging to the scope of the present invention, and the scope of the present invention should be determined by the claims to be described later.

1: terminal 2: main body
3: display 4: microphone
11: speaker 10: speaker unit
13: auxiliary speaker 20: control unit
30: communication unit 40: storage unit
50: display

Claims (6)

Communication department;
A speaker unit spaced at a predetermined interval and including a plurality of speakers for outputting sound received through the communication unit; And
And a control unit that processes the sound so that the sound is concentrated at a predetermined point in front of the output direction of the speaker unit and assigns an output sound to each of the plurality of speakers,
The control unit
The sound band of the output sound output through the plurality of speakers is divided into a plurality of bands, and the output sound of one or more bands selected from among the plurality of bands is beamformed and output, and the output sound of the other bands is original. It outputs as sound, and beamforming the output sound to hopping the band to be outputted to change to another band over time,
The speaker unit
A terminal for preventing the leakage of a call sound, further comprising an auxiliary speaker having an output direction different from that of the plurality of speakers, wherein a jamming sound is output through the auxiliary speaker so that others cannot hear the output sound output through the speaker. delete The method of claim 1,
The output sound of any one or more bands is
Terminal for preventing the outflow of a call sound, characterized in that the plurality of speakers have different phases or sound pressure is adjusted. delete delete The method of claim 1,
The control unit
A terminal for preventing the outflow of a call sound, characterized in that the output of the beamformed output sound and the output sound of the remaining bands are differently adjusted and output.

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