KR101364049B1 - System and Method for Personal Position Directed Speaker and computer-readable recording medium with program therefor - Google Patents

Abstract

The present invention modulates the music and sound of the audible frequency band into the sound of the ultrasonic band and modulates the sound according to the principle so that music and sound of the actual audible frequency are generated in the air, rather than a simple frequency modulation. An ultrasonic modulator for providing a super-directional speaker with a modulation technique that prevents popularization, and an ultrasonic modulator for modulating a carrier wave whose audio signal is frequency-modulated into a first ultrasonic modulated signal of an ultrasonic band higher than an audible frequency band, and the ultrasonic modulator. An ultrasonic wave generator configured to generate a second ultrasonic modulated signal having a higher output intensity than the first ultrasonic modulated signal based on the ultrasonic modulated signal modulated by the ultrasonic band, and in front of the first ultrasonic modulated signal modulated by the ultrasonic modulator. Second ultrasonic modulation generated by the ultrasonic generator The can is composed including an ultrasonic generator for generating a third ultrasonic signal modulated by combining an arc having a second orientation.

Description

System and Method for Personal Position Directed Speaker and computer-readable recording medium with program therefor}

The present invention is a speaker that improves the directivity using ultrasonic waves, the existing speaker outputs the sound spread in all directions, but the speaker of the present invention transmits the sound in only one direction without spreading the sound to send a loud sound far It relates to a Personal Position Directed Speaker (PPDS), a super-directional speaker that can only be heard by the user and that only the user can hear the sound so that it is not transmitted to others in the same room.

Speakers are installed in all places of home, work, outdoor, buildings, households, etc. in modern human life and sound such as TV, audio, car, etc. from small household appliances such as mobile phones, mobile devices, Speakers and earphones are used in every electronic device that needs to be done. As consumers tend to enjoy the sound of music and images they want, the demand for speakers and earphones used is increasing.

However, as consumers' desire to enjoy music and sound through speakers and earphones increases, existing dynamic speakers and earphones have limitations and inconveniences in various situations and uses.

In the case of the first most dynamic (vibration plate) speaker, the sound output from the speaker converts an electrical signal into vibration and delivers it in the air. In other words, when the vibration is transmitted in the air, it is isotropic and the sound spreads to all the spaces. Therefore, when other people in the space do not want the speaker's sound, it generates noise pollution and the user's own sound You have no choice but to leak it to others.

Secondly, the earphones have the advantage of being able to carry and freely listen to music without leaking sound to other people, because the tiny speakers are inserted into the ears, but the earphones block the ears so that the user can hear outside sounds. There is a problem that hearing problems occur if you listen for a long time without.

In order to solve this problem, a super-directional speaker that can output sound only in a specific direction has emerged.

The invention of such a super-directional speaker began with the discovery of the submarine's radar technology, sonar, after World War II, that in the 1970s it was possible to use a sonar in the air to send sound like a beam. Since then, many scientists have studied the physical principles of supergiant loudspeakers and how to send existing speech (the sound of the audible range) to the speakers. It is easy to understand that the principle of superdirectional speakers is due to the physical nonlinearity of the air, but the technology of modulating existing voices for use in speakers was difficult in the 20th century. In 2000, the core technology of the speaker was invented by American Technology Corporation (ATC), Holosonics in the US, MITSUBISHI in Japan, and Sonycast in Korea to commercialize the speaker.

Super-directional speakers, however, have powerful features that traditional speakers do not have, but are not widely used and are not well known.

The first reason is that the modulation technology is monopolized by the four companies listed above. In other words, a commonly used diaphragm speaker (dynamic speaker) was invented in 1925 and has been used so far without any major change in technology. Because of this, the diaphragm speaker can be made without any special technique and it can be bought cheaply. However, super-directional speakers can only realize the functions of the speaker when modulation technology is essential, so no other company can make a speaker. Thus, four companies have a technology monopoly strategy that is 10 to 20 times the price of a general diaphragm speaker, making it difficult for ordinary consumers to purchase super-directional speakers.

Another reason is that the modulation technique is complex and difficult. That's why four companies have 40 years of super-directional speakers. Therefore, the modulation channel is much more complicated and larger than the ultrasonic generator of the speaker. Since the modulation circuit that implements such modulation technology is complicated and difficult to make, there is a problem that the manufacturing cost is high and the mass production is difficult.

Therefore, the present invention has been made in order to solve the above problems, by modulating the music and sound of the audible frequency band to the sound of the ultrasonic band, the principle of producing music and sound of the actual audible frequency in the air rather than a simple frequency modulation The purpose of the present invention is to provide a super directional speaker with a modulation technique that prevents the popularization of the super directional speaker through a configuration that modulates according to the present invention.

It is another object of the present invention to provide a personal position direction speaker system applicable to a portable product that can be carried at a low cost and a compact size with a large and complicated modulation circuit, and a method for providing the same.

Features of the personal position direction speaker system according to the present invention for achieving the above object is an ultrasonic modulator for modulating the carrier frequency-modulated carrier wave into a first ultrasonic modulated signal of an ultrasonic band higher than the audible frequency band, the ultrasonic wave An ultrasonic generator for generating a second ultrasonic modulated signal having a higher output intensity than the first ultrasonic modulated signal based on the ultrasonic modulated signal modulated by the modulator to the ultrasonic band, and the first ultrasonic modulated signal modulated by the ultrasonic modulator And an ultrasonic generator for generating a third ultrasonic modulated signal having superdirectivity by combining the second ultrasonic modulated signal generated by the ultrasonic generator.

Preferably, the personal position direction speaker system comprises a carrier oscillator for outputting a carrier of a constant frequency, an audio signal source for outputting an audio signal, and a frequency modulator for frequency modulating the carrier from the carrier oscillator with an audio signal from an audio signal source. Characterized in that further comprises.

Preferably, the carrier oscillator is characterized in that for outputting a carrier of 40KHz.

Preferably the audio signal source is characterized in that the device for outputting sound, including MP3, PC, smartphone, TV.

Preferably, the second ultrasonic modulated signal is an ultrasonic pulse.

Preferably, the ultrasonic modulator moves the input frequency-modulated carrier to a predefined ultrasonic band and modulates the ultrasonic band.

Preferably, the predefined ultrasonic band is characterized in that the ultrasonic band of 20KHz or more.

Preferably, the ultrasonic generator includes at least one ultrasonic generator, and emits the ultrasonic wave in a direction toward the ultrasonic generator.

Preferably, the ultrasonic generator includes a first ultrasonic generator for outputting the first ultrasonic modulation signal, a second ultrasonic generator for outputting the second ultrasonic modulation signal at an angle within 180 degrees in a direction opposite to the first ultrasonic generator, And a control unit.

Preferably, the first ultrasonic generator and the second ultrasonic generator are attached to each other at a predetermined angle in a direction opposite to each other.

Preferably, the first ultrasonic generator and the second ultrasonic generator are spaced apart from each other by a predetermined distance.

Preferably, the first and second ultrasonic generators are each configured to have an angle of less than 180 degrees in a direction in which at least two or more ultrasonic generators face each other.

According to an aspect of the present invention, there is provided a method for providing a personal position direction speaker according to the present invention, comprising the steps of: (A) modulating a carrier frequency-modulated carrier into a first ultrasonic modulated signal of an ultrasonic band higher than an audible frequency band; (B) generating a second ultrasonic modulated signal having a higher output intensity than the first ultrasonic modulated signal based on the ultrasonic modulated signal modulated into the ultrasonic band; and (C) the modulated first ultrasonic modulated signal. And combining the second ultrasonic modulated signal generated at the front end to generate a third ultrasonic modulated signal having superdirectivity in the direction toward the ultrasonic generator.

Preferably, the third ultrasonic modulated signal is characterized in that a frequency component (sound insulation) corresponding to a difference in frequency is generated through difference frequency distortion, which is a kind of intermodulation distortion.

Preferably, the generated frequency component (sound signal) is an audio frequency band.

Preferably, the step (C) includes outputting the first ultrasonic modulated signal, outputting the second ultrasonic modulated signal at an angle within 180 degrees in a direction facing the first ultrasonic generator, and generating the first ultrasonic modulated signal. And generating the third ultrasonic modulation signal in a region where the modulation signal and the second ultrasonic modulation signal overlap each other.

INDUSTRIAL APPLICABILITY The personal position-direction speaker system and the method of providing the same according to the present invention as described above have the following effects.

First, because the technology is simple and simple, the production cost is much lower than the competitive products, and it is easy to mass production, so the selling price can be significantly lower than the competitive products, so that the product can be produced and sold at the same price as the general diaphragm speaker. Consumers will be able to take advantage of the features of super-directional speakers at an affordable price and develop into popular speakers, followed by diaphragm speakers and earphones.

Second, by implementing sound modulation as a computational algorithm application without using complicated circuits, it is possible to miniaturize large and complex modulation circuits made by four existing companies, and to carry audio, computer speakers, laptops, smartphones, tablets, etc. It can be commercialized as a speaker.

1 is a block diagram showing a configuration of a personal position direction speaker system according to an embodiment of the present invention;
2A to 2C are graphs showing respective waveforms of frequencies modulated in the personal position speaker system according to the present invention.
3 is a view for explaining directivity according to sound transmission of a general speaker and a personal position speaker system according to the present invention.
4A to 4C and 5 are schematic diagrams showing another embodiment of the personal position speaker system according to the present invention.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

Preferred embodiments of the personal position-direction speaker system and method of providing the same according to the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

1 is a block diagram illustrating the configuration of a personal position speaker system according to an embodiment of the present invention.

As shown in FIG. 1, the personal position direction speaker system includes a carrier oscillator 10 for outputting a carrier of constant frequency, an audio signal source 20 for outputting an audio signal, and a carrier wave from the carrier oscillator 10. A frequency modulator 30 for frequency modulating the audio signal from the source 20, an ultrasonic modulator 50 for modulating the frequency modulated carrier wave output from the frequency modulator 30 into an ultrasonic band, and the ultrasonic modulator 50 Ultrasonic generator 60 for generating an ultrasonic pulse having a higher output intensity based on the ultrasonic modulated signal modulated by the ultrasonic band in the ultrasonic band, and in front of the ultrasonic modulated signal modulated by the ultrasonic modulator 50 Ultrasonic generator 70 for combining the ultrasonic pulse generated in the (60), and generates an ultrasonic modulated signal combined with the ultrasonic pulse at the front end.

At this time, the carrier oscillator 10 supplies a carrier wave of a predetermined frequency, for example, a carrier wave of 20 KHz or more to the frequency modulator 30. The audio signal source 20 is composed of all devices that output sound such as MP3, PC, smart phone, TV, and the like, and supplies the audio signal as a modulated signal to the frequency modulator 30. [

As shown in FIG. 2A, the frequency modulator 30 frequency-modulates a carrier wave input from the carrier oscillator 10 as a modulated signal from the audio signal source 20. The frequency-modulated signal 100 is input to the ultrasonic modulator 50 via the amplifier 40. Then, as shown in FIG. 2B, the ultrasonic modulator 50 moves the input frequency-modulated carrier wave to a predefined ultrasonic wave band to modulate the ultrasonic wave band into an ultrasonic wave band. In this case, the ultrasonic modulator 50 converts the sound into information about a frequency using a Fourier transform, and then simply shifts the sound into an ultrasonic band to modulate the audio signal in an ultrasonic band. It must be modulated according to the principle so that an audio signal of audio frequency is generated.

In addition, the ultrasound generator 60 generates an ultrasound pulse having a higher output intensity based on the modulated signal of the ultrasound band modulated by the ultrasound modulator 50. As shown in FIG. 2C, the ultrasonic generator 70 combines the ultrasonic pulses generated by the ultrasonic generator 60 in front of the ultrasonic modulated signal modulated by the ultrasonic modulator 50, and the ultrasonic pulse is applied to the front stage. Generate a combined ultrasonic modulated signal. At this time, the ultrasonic generator 70 is made of, for example, at least one ultrasonic generator, has a very high directivity (hereinafter referred to as superdirectional), and based on the frequency modulated signal amplified by the amplifier 40, the ultrasonic generator. It emits with super directivity in the direction to which 70 is directed. And when the ultrasonic generator 70 is directed, the user can hear the sound corresponding to the audio signal from the audio signal source 20, and the sound corresponding to the audio signal is not heard in the periphery where the ultrasonic generator 70 is not directed. do.

Here, a brief description will be given of a basic principle in which, when an ultrasonic wave is emitted based on a frequency-modulated signal frequency-modulated by an audio signal from an audio signal source 20, a sound corresponding to the original audio signal is heard.

)성분을 포함하는 신호를 입력하면, 수학식 3에서 나타내는 바와 같이, 혼변조 왜곡의 일종인 차주파수 왜곡이 생긴다. 즉, 계통의 출력에는 주파수의 차

에 상당하는 주파수 성분(차음)이 나타난다. As shown in Equation (1), there is a nonlinearity following the excellent in the system, and the system has two frequencies (

) Component, a differential frequency distortion, which is a type of intermodulation distortion, is generated, as shown in Equation (3). That is, the output of the system has a frequency difference

(Sound signal) corresponding to the frequency component (sound signal).

Where x is the input signal of the system and y is the output signal of the system.

When Equation (2) is entered into Equation (1), the following Equation (3) is obtained.

As described above, when the ultrasonic generator 70 generates an ultrasonic modulated signal in which an ultrasonic pulse (for example, 42 KHz) F1 is coupled to the front end of the ultrasonic modulated signal (40 KHz) F2, the 2 KHz corresponding to the difference frequency distortion is generated. You will hear sound insulation. For reference, 2KHz, which is a loud sound, is heard because it is an audio band. As is widely known, in frequency modulation, a frequency modulated signal includes a number of side waves centering on a carrier wave. Therefore, the air has nonlinearity as described above with respect to the ultrasonic wave, and the original audio signal is reproduced and the user can hear the audio signal corresponding thereto.

On the other hand, the frequency modulated signal (carrier wave) modulated in the frequency modulator 30 is an audio signal of an audible frequency (20 Hz to 20 KHz) band that can be heard through the human ear, and the ultrasonic modulated signal modulated by the ultrasonic modulator 50 is a It is an audio signal in the ultrasonic band of 20KHz or more that can not be heard through this ear. Therefore, in the present invention, an ultrasonic modulation signal is defined as an ultrasonic wave band of 20KHz or more to modulate an ultrasonic modulation signal. For reference, the best characteristic is obtained at 40KHz, which has the highest sound pressure.

The personal position direction speaker system according to the present invention is a speaker which improves the directivity using ultrasonic waves through such a configuration. In the conventional speaker shown in FIG. 3 (a), the output sound spreads in all directions, but the present invention The sound of the Personal Position Directed Speaker System (PPDS) according to the present invention can transmit sound only in one direction without spreading, as shown in FIG. Can send until.

As a result, it is possible to apply a personal computer or an audio speaker that can hear only the user's own sound, and can listen to the sound without blocking the ears without interfering with people in offices, public places, . However, if the sound travels straight to the front of the speaker and travels far away, there is no need to transmit sound far enough for private use or for certain personnel in a limited space. It may even cause discomfort by transmitting sounds to unwanted places. In order to solve this problem, it is possible to use a plurality of speakers (ultrasound generator 70) to form a speaker that the sound proceeds to a limited distance without spreading the sound.

Figure 4a is a view showing another embodiment showing the configuration of a personal position speaker system according to the present invention.

As shown in FIG. 4A, two ultrasonic generators 70 are arranged adjacent to each other at a predetermined angle θ in a facing direction, and then only a specific fixed frequency (for example, 42 KHz) F1 is applied to the second ultrasonic generator. Oscillates, and another first ultrasonic generator oscillates modulated ultrasonic waves (40 kHz) F2. Then, a specific region (F1 + F2) where ultrasonic waves emitted from the first and second ultrasonic generators meet is generated, and the frequency difference is generated only in the space. When this space (F1 + F2) is deviated, the ultrasonic waves from the two speakers can not produce the audible frequency because the traveling directions are different. That is, the fixed frequency (F1) and the Fourier transform frequency (F2) of the PPDS are outputted to the first and second ultrasonic generators. When the angles of the two ultrasonic generators are within 180 degrees, the first and second ultrasonic waves Since the sound progresses only within a certain distance in front of the generator, no sound is generated above it, so the above problem can be solved.

Figure 4b is a view showing another embodiment showing the configuration of a personal position speaker system according to the present invention, Figure 4b is a predetermined direction in the direction facing each other adjacent to the first and second ultrasonic generators in the structure of Figure 4a Rather than the arrangement of the angles θ, the first and second ultrasonic wave generators are configured to be spaced apart from each other by a predetermined distance, and as shown in FIG. 4A, the arrangements are arranged at predetermined angles θ in a direction facing each other. .

As shown in FIG. 4A, the configuration of FIG. 4B also makes a situation in which a sound is generated only in one specific part of the space (F1 + F2), and there is no sound in all other spaces.

On the other hand, as described in the embodiment consisting of two ultrasonic generators as shown in Figures 4a, 4b, as shown in Figure 4c described above by arranging at least three ultrasonic generators at a predetermined angle (within 180 degrees) facing each other. With this concept, you can construct a personal positioning speaker system.

On the other hand, the embodiment of the present invention is an improvement over other modulation techniques, the implementation is very simple, the implementation can be sufficient by a simple software method. Therefore, as shown in FIG. 5, the program instruction executed by the digital signal processor (DSP) and all the operational processors capable of performing processing functions, such as a CPU (Advance RISC Machine), can be operated without problems. Can be written into a program that can be executed on a computer through program instructions to be executed. That is, the various steps involved in the method according to the present invention may be stored in a computer readable recording medium. The medium may be a magnetic storage medium such as a ROM, a floppy disk, a hard disk, etc., an optical reading medium such as CD-ROM or DVD, a digital storage medium such as a USB memory, XD), etc.) and carrier waves (e.g., transmission over the Internet).

In addition, by converting the existing sound source to Fourier and then boosting the bass by increasing the bass frequency part and shifting it to a specific frequency by PPDS method, it becomes an ultrasonic super-directional speaker and at the same time produces a sound with improved bass than the existing sound source. Can be. That is, if the conventional equalizer function is combined with the ultrasonic speaker, the sound quality can be changed.

Although the technical spirit of the present invention described above has been described in detail in a preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (17)

An ultrasonic modulator for modulating a carrier wave on which an audio signal is frequency modulated into a first ultrasonic modulated signal in an ultrasonic band higher than an audible frequency band;
An ultrasonic wave generator configured to generate a second ultrasonic modulated signal having a higher output intensity than the first ultrasonic modulated signal based on the ultrasonic modulated signal modulated into an ultrasonic band by the ultrasonic modulator;
And an ultrasonic generator for generating a third ultrasonic modulated signal having super-directivity by combining the second ultrasonic modulated signal generated by the ultrasonic generator with the first ultrasonic modulated signal modulated by the ultrasonic modulator. Personal position directional speaker system. The method of claim 1,
A carrier oscillator for outputting a carrier wave having a constant frequency,
An audio signal source for outputting an audio signal,
Further comprising a frequency modulator for frequency modulating a carrier wave from the carrier oscillator to an audio signal from an audio signal source. 3. The method of claim 2,
And the carrier oscillator outputs a carrier wave of 20 KHz or higher. 3. The method of claim 2,
The audio signal source is a personal position direction speaker system, characterized in that the device for outputting sound, such as MP3, PC, smartphone, TV. The method of claim 1,
And said second ultrasonic modulated signal is an ultrasonic pulse. The method of claim 1,
And the ultrasonic modulator shifts the input frequency-modulated carrier to a predefined ultrasonic band to modulate the ultrasonic band. The method according to claim 6,
Wherein said predefined ultrasonic band is an ultrasonic band of 20 KHz or more. The method of claim 1,
Wherein the ultrasonic generator comprises at least one ultrasonic wave generating element and emits the ultrasonic wave in a direction toward the ultrasonic wave generator. The ultrasonic diagnostic apparatus according to claim 1, wherein the ultrasonic generator
A first ultrasonic generator for outputting the first ultrasonic modulation signal;
And a second ultrasonic generator for outputting the second ultrasonic modulation signal at an angle within 180 degrees in a direction opposite to the first ultrasonic generator. The method of claim 9,
Wherein the first ultrasonic generator and the second ultrasonic generator are adjacent to each other and configured to face each other at a predetermined angle. The method of claim 9,
Wherein the first ultrasonic generator and the second ultrasonic generator are spaced apart from each other by a predetermined distance. The method of claim 9,
The first ultrasonic generator is configured at an angle of less than 180 degrees in a direction facing each other at least two or more ultrasonic generators,
Wherein said second ultrasonic generator is configured at an angle of less than 180 degrees in a direction facing each other of at least two ultrasonic generators. (A) modulating a carrier wave frequency-modulated carrier into a first ultrasonic modulated signal of an ultrasonic band higher than the audible frequency band,
(B) generating a second ultrasonic modulated signal having a higher output intensity than the first ultrasonic modulated signal based on the ultrasonic modulated signal modulated into the ultrasonic band;
(C) combining the second ultrasonic modulated signal generated in front of the modulated first ultrasonic modulated signal to generate a third ultrasonic modulated signal having superdirectivity in a direction toward the ultrasonic generator. How to provide a personal position direction speaker. The method of claim 13,
And the third ultrasonic modulated signal generates a frequency component (sound insulation) corresponding to a difference in frequency through difference frequency distortion, which is a kind of intermodulation distortion. 15. The method of claim 14,
Wherein the generated frequency component (sound signal) is an audible frequency band. 14. The method of claim 13, wherein step (C)
Outputting the first ultrasonic modulated signal;
Outputting the second ultrasonic modulated signal at an angle within 180 degrees in a direction facing the first ultrasonic generator, so that the third ultrasonic modulated signal is overlapped with the first ultrasonic modulated signal and the second ultrasonic modulated signal; A method of providing a personal position direction speaker comprising the step of generating a signal. A computer-readable recording medium having recorded thereon a program for executing each step of the method for providing a personal position direction speaker according to any one of claims 13 to 16.

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