KR102235797B1 - System for Sound Tag Using Ultra Directional Speaker - Google Patents

Abstract

The present invention relates to a sound tag system using a super directional speaker. The disclosed sound tag system using the super directional speaker provides the sound tag system using the super directional speaker, which includes the super directional speaker which modulates the sound tag containing information on a carrier wave in an ultrasonic domain, and a receiving terminal which receives the modulated signal transmitted from the super directional speaker, analyzes and processes the sound tag information included in the signal. According to the present invention, it is possible to provide the sound tag system using the super directional speaker which provides the sound tag system using the super directional speaker which can transmit even a small sound with directivity to a long distance and is strong against noise.

Description

System for Sound Tag Using Ultra Directional Speaker

The present invention relates to a sound tag system using a supercardioid speaker, and more particularly, to a sound tag system using a supercardioid speaker in which directivity, communication distance expansion, and integrity are ensured.

The content described in this section merely provides background information on the present embodiment and does not constitute the prior art.

Sound communication technology refers to a technology that transmits digital information by putting digital information in sound in a high frequency band that humans cannot hear. The higher the frequency of the sound, the more inaudible it is to the human ear, so the sound of the high frequency band is used like Morse code to send information. With this sound wave communication technology, devices can exchange information with each other without disturbing people.

With sonic communication technology, when music with sound codes applied from TV or radio is played, the mobile phone recognizes the sound and automatically displays singer information, lyrics, MP3 storage, etc. on the mobile phone, or product information and purchase information introduced in TV CFs. You can receive it from your mobile phone and provide related services. Also called sound code, sound tag or voice barcode technology.

The sound wave communication technology according to the prior art is better than electromagnetic waves, but spreads widely in a closed space and has transmission characteristics.

In addition, the conventional sonic communication technology uses low-frequency ultrasonic waves (18-20KHz) in the audible area, and artificial sounds such as music are treated as noise in sonic communication, and complex frequency patterns (such as Chirp) are used for noise resistance. As a result, BPS (Bit Per Second) performance deteriorates.

In addition, the conventional sound wave communication technology enables communication only in the air over a short distance, and causes spatial security issues and unnecessary communication triggers.

Accordingly, in the present invention, it is intended to propose a sound tag system using a super-directional speaker capable of solving the technical limitations described above.

Korean Patent Registration No. 10-0622078, published on September 1, 2006 (Name: Supercardioid speaker system and signal processing method) Korean Patent Registration No. 10-1074431, published on October 11, 2011 (Name: Super-Directional Ultrasonic Speaker System) Korean Patent Publication No. 10-2019-0110275, published on September 30, 2019 (Name: Acoustic event detection method using a directional microphone, and Acoustic event detection device using a directional microphone)

The present invention has been proposed in order to solve the above-described problems of the prior art, and has a main object to provide a sound tag system using a super-directional speaker capable of transmitting a small sound to a distance and being robust to noise.

In addition, another object of the present invention is to provide a sound tag system using a super-directional speaker that enables communication to a specific spatial area through a directing range of ultrasonic waves.

In addition, another object of the present invention is to provide a sound tag system using a super-directional speaker that enables setting of a communication area (near distance, medium distance, long distance, etc.) through parameterization such as a transmission carrier.

The problem to be solved of the present invention is not limited to those mentioned above, and another problem to be solved that is not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

One aspect of the present invention for achieving the above object is a super-directional speaker for modulating a sound tag including information on a carrier wave of the ultrasonic region; And a receiving terminal receiving the modulated signal transmitted from the super-directional speaker and analyzing and processing sound tag information included in the signal.

Another aspect of the present invention is a signal amplifying unit for amplifying a signal to be transmitted; A signal modulator that modulates sound tag information including information by fusing it with an ultrasonic carrier; A frequency combination unit that combines a frequency domain to include the sound tag; And a signal transmitting unit for transmitting the signal generated by the signal modulator or the frequency combination unit to a receiving terminal.

Another aspect of the present invention is a signal receiver for receiving a modulated signal including a sound tag from a super-directional speaker; A signal analysis unit for extracting a sound tag region containing information from among the received signals; And a signal processing unit for controlling an apparatus of the receiving terminal according to the information analyzed by the signal analysis unit.

According to the sound tag system using a supercardioid speaker of the present invention, it is possible to provide a sound tag system using a supercardioid speaker that is capable of transmitting a small sound to a distance and is robust to noise.

In addition, there is an effect that it is possible to provide a sound tag system using a super-directional speaker that enables communication to a specific space area through a directing range of ultrasonic waves.

In addition, there is an effect that it is possible to provide a sound tag system using a super-directional speaker that enables communication area setting (near-range, mid-range, long-distance, etc.) through parameterization such as transmission carriers.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description to aid in understanding of the present invention, provide embodiments of the present invention, and together with the detailed description, the technical features of the present invention will be described.
1 is a diagram illustrating a transmission/reception frequency domain of a conventional sound wave communication system.
2 is a diagram illustrating a configuration of a sound tag system using a super-directional speaker according to an embodiment of the present invention.
3 is a diagram illustrating a frequency domain of a sound tag system using a super-directional speaker according to an embodiment of the present invention.
4 is a diagram illustrating a configuration of a supercardioid speaker according to an embodiment of the present invention.
5 is a diagram illustrating the configuration of a receiving terminal according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The detailed description to be disclosed below together with the accompanying drawings is intended to describe exemplary embodiments of the present invention, and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those of ordinary skill in the art to which the present invention pertains knows that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or may be illustrated in a block diagram form centering on core functions of each structure and device.

Throughout the specification, when a part is said to "comprising or including" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. do. In addition, terms such as "... unit", "... group", and "module" described in the specification mean a unit that processes at least one function or operation, which can be implemented by hardware or software or a combination of hardware and software. have. In addition, "a or an", "one", "the" and similar related words are different from the present specification in the context of describing the present invention (especially in the context of the following claims). Unless indicated or clearly contradicted by context, it may be used in the sense of including both the singular and the plural.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a transmission/reception frequency domain of a conventional sound wave communication system.

The data transmission method using sound according to the prior art transmits sound in an audible region through transmission and reception of sound waves in a human-centered sound environment.

The frequency in the human audible range is 20Hz to 20kHz. The reproducible frequency of a general smartphone speaker is 20Hz ~ 20KHz, and the sound-receivable frequency of the smartphone microphone is 20Hz ~ 22KHz.

In the existing sound wave communication system, data was transmitted and received in an audible region, which is a region that is difficult to hear, mainly from 18 kHz to 20 kHz, which is a near ultrasonic region.

However, there is a problem of the prior art that the recognition rate is lowered because various sounds exist in the audible region of 18 kHz to 20 kHz, and there is a lot of noise other than data of the sound tag.

2 is a diagram illustrating a configuration of a sound tag system using a super-directional speaker according to an embodiment of the present invention.

The system according to an embodiment of the present invention uses an ultrasonic super-directional speaker instead of a general audible frequency band speaker to transmit a modulated (ultrasonic region, for example, 40 kHz) sound, and a sound tag (data) capable of receiving sound in the audible region. It's about transmission.

The super-directional speaker 100 is a speaker made so that sound can be heard only in a specific area by aiming and sending sound like light, and the range of applications such as an exhibition hall or a bus stop as well as a guidance system for the visually impaired is endless. The supercardioid speaker 100 is a special speaker that modulates a sound signal and then loads it onto an ultrasonic signal. The sound transmission distance is up to 300m, which is much longer than that of ordinary speakers.

Ultrasound is a type of acoustic vibration and refers to sound waves beyond the range that can be heard by humans. The audible range varies from person to person, but the frequency that an average person can hear is about 20Hz to 20kHz. Therefore, in ultrasonic technology, sound waves with a frequency of 20 kHz or more are usually called ultrasonic waves.

Ultrasound is inaudible at all because it is in a frequency range outside the audible range that humans can hear. However, when an ultrasonic beam passes through space, the ultrasonic wave is distorted in a predictable direction due to the intrinsic properties (nonlinearity) of the space. This distortion can be changed to the frequency component of the audible band, and if it is accurately predicted and precisely adjusted, it can be used as the super-directional speaker 100.

The supercardioid speaker 100 is a device for reproducing an audio signal in an audible band from ultrasonic waves having an audible band or higher, and is a high-tech acoustic device by combining ultrasonic waves and sound waves.

The straightness of ultrasonic waves, flat frequency band characteristics of ultrasonic transducers, and acoustic energy conversion are highly efficient, and there is no deterioration of sound quality due to harmonics. In addition, since there is no limit of a low-frequency reproduction band due to mechanical resonance as in a conventional speaker, and an enclosure is not required as a speaker system, it is possible to improve sound quality, improve band characteristics, and increase efficiency compared to a conventional speaker system. In addition, it can be applied to various IT fields because it has the advantage of being able to easily generate the entire audible range and its directivity in a specific direction.

The supercardioid speaker 100 needs to have an additional function for digital modulation and amplification into an ultrasonic region as well as a function of a general speaker to be mounted on an amplifier.

The receiving terminal 200 is a device that receives a signal transmitted from the super-directional speaker 100 and extracts a sound tag included in the signal, and is typically a smartphone, but can process information with a built-in microphone. All information and communication devices, desktop, tablet PC, notebook, net book, multimedia terminal, wired terminal, fixed terminal, IP (Internet Protocol) terminal, mobile phone, PMP ( Portable Multimedia Player), MID (Mobile Internet Device), or any type of information communication device.

3 is a diagram illustrating a frequency domain of a sound tag system using a super-directional speaker according to an embodiment of the present invention.

The supercardioid speaker 100 according to the present invention uses a frequency of the inaudible region (20 kHz or more) as a carrier wave (e.g., 40 kHz), unlike a general speaker, and the receiving terminal 200 is a region capable of receiving a microphone in the case of a smartphone. Is 20~22kHz.

In FIG. 3, it is shown that in the super-directional speaker 100, bands of 18 kHz to 20 kHz and 20 kHz to 22 kHz are used as sound tag regions, and 40 kHz is used as a carrier wave.

In addition, although FIG. 3 illustrates a double sideback modulation (DSB) method or a vestigial sideband (VSB) in FIG. 3, the single sideback modulation (SSB) is not excluded.

In the super-directional speaker 100, modulation is composed of a signal carrier for carrying information, an amplitude of the carrier wave, and a message signal having information.

When the amplitude-modulated signal is Fourier transformed and viewed in the frequency domain, the same type of upper and lower sidebands with frequency shifted up and down by the carrier frequency are generated.

Among the various modulation techniques, when the amplitude of the carrier wave is proportional to the information signal, a technique that loads and sends information to both the upper sideband and the lower sideband is called double sideback modulation (DSB).

Single Sideback Modulation (SSB) is a method of transmitting only one sideband of the upper sideband or the lower sideband on the spectrum.

VSB (Vestigial Sideband) Unlike SSB among the amplitude modulation methods, it is a modulation method in which one sideband is not completely removed, but a part of the sideband is left and the rest is removed for transmission.

In the microphone of the receiving terminal 200, there is no significant difference from the conventional sound tag method in terms of sound reception in the audible region (18-20 kHz) and near ultrasonic region of a general sound tag. However, there is a lot of noise of general audible sound in this area.

In the case of using the method according to an embodiment of the present invention, filtering is performed on other regions, and speed and reliability are improved when data is acquired for the 20 kHz to 22 kHz region.

In FIG. 3, both cases of sound reception in an ultrasonic proximity region (18 kHz to 20 kHz) and an inaudible audible region (20 kHz to 22 kHz) are illustrated.

4 is a diagram illustrating a configuration of a supercardioid speaker according to an embodiment of the present invention.

The signal amplification unit 110 amplifies the output of the signal, and the signal modulator 120 fuses the sound tag information onto a carrier wave (eg, 40 kHz) so as to be transmitted.

In the sound tag transmission method according to the present invention, data can be transmitted in the following frequency domain.

1. 20Hz ~ 18kHz: Transmits audible data using the general audible region (audible data)

2. 18kHz ~ 20kHz: Transmits data to the audible area that is hard to hear

3. 20kHz ~ 22kHz: Transmit data to inaudible audible area

4. A combination of items 1 & 2, or 2 & 3 above

In FIG. 3, only 2 and 3 of the above four methods are shown.

The frequency combination unit 130 combines the above schemes as necessary to expand the data transmission frequency range to improve speed and reliability.

The signal transmitting unit 140 transmits the modulated or combined signal to the receiving terminal 200.

On the other hand, among the latest smart phones, there is a phone with a speaker capable of playing up to 22 kHz, and when this function is implemented, the signal modulator 120 is omitted, so that two-way communication (sound tag) in the 20 kHz to 22 kHz band without additional hardware is implemented. It is also possible to do it.

5 is a diagram illustrating the configuration of a receiving terminal according to an embodiment of the present invention.

The signal receiving unit 210 receives the modulated signal transmitted from the signal transmitting unit 140 of the superdirectional speaker 100.

The signal analysis unit 220 extracts a portion of the received modulated signal containing information, that is, a sound tag area. There is no significant difference between the conventional sound tag method in the sound-receiving for the audible area and near ultrasonic area of a general sound tag, but when data is acquired in the 20 kHz to 22 kHz area, filtering is performed for the other areas and 20 kHz to 20 kHz. By acquiring data in the 22 kHz region, speed and reliability are improved.

The signal processing unit 230 processes and processes the information by driving other devices of the receiving terminal, such as a display, a speaker, and a communication unit, according to the information analyzed by the signal analysis unit 220.

When the receiving terminal 200 is a smart device, the signal receiving unit 210 may utilize the microphone of the receiving terminal 200. In addition, the signal analysis unit 220 and the signal processing unit 230 may be implemented as a function of an application program (app, App) that is driven or activated in the background.

Combinations of each block of the block diagram attached to the present specification and each step of the flowchart may be performed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general-purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are shown in each block or flowchart of the block diagram. Each step creates a means to perform the functions described. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture in which the instructions stored in the block diagram contain instruction means for performing the functions described in each block of the block diagram or each step of the flowchart. Since computer program instructions can also be mounted on a computer or other programmable data processing equipment, a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in each block of the block diagram and each step of the flowchart.

In addition, each block or each step may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative embodiments, functions mentioned in blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, or the blocks or steps may sometimes be performed in the reverse order depending on the corresponding function.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

According to the sound tag system using a supercardioid speaker of the present invention, a sound tag system using a supercardioid speaker that provides a sound tag system using a supercardioid speaker that can transmit even a small sound to a distance with directivity and that is robust to noise is provided. In that it can be used as a solution that can be used as a solution, it is possible to market or sell the applied device, not only the use of the related technology, as it exceeds the limitations of the existing technology. It is a possible invention.

100: supercardioid speaker 120: signal modulator 130: frequency combination unit
140: signal transmitting unit 200: receiving terminal 210: signal receiving unit
220: signal analysis unit 230: signal processing unit

Claims (11)

A super-directional speaker modulating a sound tag including information on a carrier wave in the ultrasonic region; And
Receiving the modulated signal transmitted from the super-directional speaker, comprising a receiving terminal for analyzing and processing the sound tag information included in the signal,
The supercardioid speaker,
A signal amplifying unit amplifying a signal to be transmitted;
A signal modulator that modulates sound tag information including information by fusing it with an ultrasonic carrier;
A frequency combination unit that combines a frequency domain to include the sound tag; And
Including a signal transmitting unit for transmitting the signal generated by the signal modulator or the frequency combination unit to a receiving terminal,
The sound tag included in the signal modulator,
The data is modulated through the range of 18 kHz to 22 kHz,
The frequency combination unit,
A sound tag system using a supercardioid speaker, characterized in that the frequencies of the inaudible audible region of 18 kHz to 20 kHz and the inaudible audible region of 20 kHz to 22 kHz are combined. delete The method of claim 1,
Sound tag system using a super-directional speaker, characterized in that the ultrasonic carrier wave is 40 kHz. delete delete delete delete The method of claim 1,
The receiving terminal,
A signal receiver for receiving a modulated signal including a sound tag from a super-directional speaker;
A signal analysis unit for extracting a sound tag region containing information from among the modulated signals; And
And a signal processing unit for controlling a device of a receiving terminal according to the information analyzed by the signal analysis unit. The method of claim 8,
The signal analysis unit,
A sound tag system using a super-directional speaker, characterized in that filtering is performed for other frequency ranges and only sound tags in the 20 kHz to 22 kHz range are analyzed. The method of claim 8,
The signal processing unit,
A sound tag system using a super-directional speaker, characterized in that controlling a display, a speaker, or a communication unit according to information included in the sound tag. The method according to any one of claims 8 to 10,
The signal analysis unit and the signal processing unit is a sound tag system using a super-directional speaker, characterized in that included in an application program driven or activated in the background.

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