KR101074431B1 - Ultra directional speaker system - Google Patents

Abstract

A superdirectional ultrasonic speaker system is disclosed. The ultrasonic speaker system is installed at a target position according to a sporting event in a sports stadium, and includes one or more superdirectional ultrasonic speakers that generate superdirectional sound signals in an audible frequency band from the target position toward the visually impaired, but the visually impaired are superdirectional. The target position is recognized according to whether the sound source signal is heard or not, and the sports activity is performed.

Description

Super Directional Ultrasonic Speaker System {Ultra Directional Speaker System}

The present invention relates to a superdirectional ultrasonic speaker system.

In general, a speaker generates sound by converting an electrical signal into vibration and transmitting the same in the air, and isotropic when transmitting the vibration in the air. Accordingly, the listener can hear the sound of the speaker generated in all directions with respect to the speaker. At this time, the isotropy of the speaker often causes unnecessary problems. For example, in a space where various works or exhibits, such as an art gallery or a museum, are installed so that descriptions of the works and exhibits can be explained through speakers, the spaces of art galleries and museums may cause Interference occurs between sounds. In addition, if a large number of people simultaneously listen to the descriptions of different works and exhibits from the speaker, a large amount of voice guidance interferes with each other and distorts each other, resulting in large noise. In order to solve this problem, a super directional speaker has been introduced to generate a super directional sound so that the sound can be heard only in a specific direction.

One of the conventional superdirectional speakers is a parabolic superdirectional speaker using a parabolic dish. Parabolic superdirectional speakers are speakers that are designed so that the acoustic output of the speakers reflects straight into the dish by placing ordinary speakers in the focus of the parabolic dish. Parabolic superdirectional speakers are often known as museum speakers because they are often used in museums, but they are not only shorter than 10m in diameter, but also sound quality is quite short. Is very difficult.

Accordingly, in recent years, the ultrasonic speaker technology using the nonlinear interference phenomenon caused by the air in the air has been applied to the implementation of the super-directional ultrasonic speaker. Ultrasonic speaker technology has been developed since the 1960s, but has recently been developed in earnest due to the delay in commercialization due to the slow development of various peripheral devices and industrial gain problems. Super-directional ultrasonic speakers are being developed with the introduction of technology from Holosonic Reserch Labs and American Technology, respectively. Super-directional ultrasonic speakers attenuate the sound level by about 2 feet to 20dB, but the sound propagates in the form of water sprayed from a high-pressure fire hose. In addition, the super-directional ultrasonic speaker is hardly audible outside of the intended area, maintained up to a maximum effective distance of 66 feet, can be heard at 660 feet, and its distance is long, covering a range of 0.3 meters to 2.1 meters.

An example of a superdirectional ultrasonic speaker is a long range acoustic device (LRAD) superdirectional speaker. LRAD super-directional speakers can deliver clear and clear sound to targets up to 500m ahead of large ships when terrorized by small ships, providing a warning sound to block the opponent's approach when an approaching ship turns threatening. Can be. In addition, LRAD super-directional speakers are used to protect large vessels by generating a volume loud enough to cause human hearing loss, threatening terrorizing small vessels. For example, the British cruise ship Nautica threatened pirates in the Gulf of Aden using a LRAD super-directional speaker to radiate supersound beams to Somali pirates and were not attacked by Somali pirates. These LRAD superdirectional loudspeakers are powerful devices with ultrasonic noise that allow them to shoot in the desired direction, producing 145dB to 150dB of noise within 1m of the speaker, which is twice as loud as a fire alarm. 100dB of treble can disable people within 300m.

As a result of the development of the ultrasonic speaker technology, the super-directional ultrasonic speaker has been applied to various fields from voice guidance to combating pirates, and its application field has been further expanded.

Meanwhile, the visually impaired are engaged in sports activities with the help of a guardian with normal vision. Therefore, in order to support sports activities of the visually impaired people who rely on hearing, the application of the above-mentioned superdirectional ultrasonic speaker is required.

The present invention is to support the sports activities of the visually impaired people who rely on hearing using the super-directional ultrasonic speaker.

According to an aspect of the present invention, a super-directional ultrasonic speaker system is installed in a sports stadium in which a visually impaired person performs a sports activity.

Ultrasonic speaker system according to an embodiment of the present invention is installed at a target position according to a sporting event in the sports stadium, at least one super-directional ultrasonic wave to generate a super-directional sound source signal of audible frequency band toward the visually impaired at the target position Including a speaker, the visually impaired person performs a sporting activity by recognizing the target position according to whether the super-directional sound source signal is listening.

Here, a plurality of the super-directional ultrasonic speaker is provided on the boundary so that the super-directional sound source signal along the boundary between the sports stadium and the outside to form an acoustic fence.

In this case, when the sports stadium is an athletic stadium, the superdirectional ultrasonic speaker is installed for each track, and different superdirectional sound source signals are generated for each track.

Here, when the sport is an archery, the target position is a target of the archery, the super-directional ultrasonic speaker is installed on the target to generate the super-directional sound source signal toward the blind.

Here, when the sport is bowling, the target position is a bowling pin position, the super-directional ultrasonic speaker is installed at the bowling pin position to generate the super-directional sound source signal toward the blind.

Here, when the sport event is a sport event that scores a goal in the goal, the target position is the goal, the super-directional ultrasonic speaker is installed at the location of the goal to generate the super-directional sound source signal toward the visually impaired do.

The present invention can support the sports activities of the visually impaired who are active by hearing using the superdirectional ultrasonic speaker.

In addition, the present invention can prevent sports accidents that can occur during the sports activities of the visually impaired, and by minimizing the help of a guardian with normal vision can enable sports activities of the visually impaired.

1 is a configuration diagram schematically illustrating a configuration of a superdirectional ultrasonic speaker included in a superdirectional ultrasonic speaker system.
2 to 6 are views for explaining the super-directional ultrasonic speaker system installed in the sports stadium.

The present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, numerals used in the description of the present invention are merely an identifier for distinguishing one component from another.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the same reference numerals will be used for the same means regardless of the reference numerals in order to facilitate the overall understanding.

1 is a configuration diagram schematically illustrating a configuration of a superdirectional ultrasonic speaker included in a superdirectional ultrasonic speaker system.

Referring to FIG. 1, a superdirectional ultrasonic speaker includes an audio frequency wave oscillator 10, a carrier wave oscillator 20, a modulator 30, a power amplifier 40, and an ultrasonic transducer 50.

The audio frequency wave oscillator 10 generates a signal in an audio (or audible) frequency band.

The carrier wave oscillation source 20 generates a carrier wave (signal) in the ultrasonic frequency band.

The modulator 30 modulates the carrier wave of the ultrasonic frequency band output from the carrier wave oscillation source 20 using the signal of the audio frequency band output from the audio frequency wave oscillation source 10.

The power amplifier 40 amplifies the modulated signal output from the modulator 30.

The ultrasonic transducer 50 is driven by a modulated signal amplified by the power amplifier 40 to convert the modulated signal into sound waves having a finite amplitude level. These sound waves are radiated into the medium (i.e. air) and reproduced as the sound of the original audio frequency band due to the nonlinear effect of the medium. The reproduction signal of the audio frequency band reproduced as described above proceeds in the form of a beam output along the radial axis of the ultrasonic transducer 50.

For example, the ultrasonic transducer 50 may be a resonant transducer using a piezoelectric ceramic element as the oscillation element. The resonant transducer converts an electrical signal into an ultrasonic wave by using a resonance phenomenon of the piezoelectric ceramic element, and converts the ultrasonic wave into an electrical signal, thereby transmitting and receiving the ultrasonic wave. Resonant transducers using such piezoelectric ceramic elements include bimorph ultrasonic transducers, unimorphic ultrasonic transducers, and the like.

2 to 6 are views for explaining the super-directional ultrasonic speaker system installed in the sports stadium.

As shown in FIG. 2, the visually impaired perform a sports activity in a land sport with the help of a guide runner (ie, Jung In). That is, in the case of land sports, the visually impaired person is guided by a guide runner to recognize a track path. Accordingly, as shown in FIG. 3, the super-directional ultrasonic speaker is installed for each track in a track and field stadium so that the sound track is implemented, so that the visually impaired person can recognize the track's path and perform track and field sports without the help of a guide runner. . The superdirectional ultrasonic speaker is installed at a target position of the track and generates a superdirectional sound source signal along the track toward the starting line. Here, the target position may be a preset position on the extension line of the track after the end line of the track. In this case, the super-directional ultrasonic speaker installed for each track generates different sound source signals so that the visually impaired person by track can recognize his or her track.

Sports events such as archery, bowling, basketball, etc. need to visually identify the target position, making it difficult for the visually impaired to independently perform sports activities. Therefore, when the superdirectional ultrasonic speaker is installed at the target location and the superdirectional sound source signal is generated toward the visually impaired person, the visually impaired person may perform the sports activity by recognizing the target location. For example, the target position may be a target for archery, a bowling pin for bowling, a basketball goal for basketball, or the like. In addition, in the case of a sport event that scores a goal in addition to the goal, the target position may be the location of the goal. Here, the sports item that scores a goal in the goal may be various ball games, such as basketball, soccer, handball.

4 is a view showing an installation example of the super-directional ultrasonic speaker applied to the sports stadium of archery events. As shown in FIG. 4, the superdirectional ultrasonic speaker may be installed on the archery target. That is, in the case of archery events, the target position may be an archery target. The superdirectional ultrasonic speaker installed in the archery target generates a superdirectional sound signal toward the blind person who shoots the bow, so that the blind person can recognize the direction of the archery target.

5 is a view showing an installation example of the super-directional ultrasonic speaker applied to the sports stadium of the bowling event. As shown in FIG. 5, the super-directional ultrasonic speaker may be installed close to a position where a bowling pin, which is a target position, is set up. For example, the super-directional ultrasonic speaker may be installed on the wall formed at the top of the position where the bowling pin is set up, and may generate a super-directional sound source signal toward the visually impaired person.

In addition, a plurality of super-directional ultrasonic speaker is installed on the boundary so that the super-directional sound source signal travels along the boundary between the sports stadium and the outside, the acoustic fence can be implemented. In other words, the acoustic fence may be a super-directional ultrasonic speaker system that allows a visually impaired person who cannot see the boundary to hear a super-directional sound signal through hearing and recognizes the boundary of a sports stadium.

6 is a diagram illustrating a conceptual diagram of an acoustic fence. As shown in FIG. 6, the superdirectional ultrasonic speaker is disposed at each corner of the sports stadium, and the superdirectional sound source is installed to travel along the boundary. In this case, the superdirectional ultrasonic speaker generates a preset superdirectional sound source and proceeds along a boundary, so that an acoustic fence can be implemented. Such an acoustic fence can prevent accidents that may occur beyond the boundaries of the sports stadium, thereby ensuring the safe sports activities of the visually impaired.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

10: audio frequency oscillator
20: carrier wave oscillator
30: modulator
40: power amplifier
50: ultrasonic transducer

Claims (6)

In the super-directional ultrasonic speaker system installed in the sports stadium where the visually impaired perform sports activities,
At least one super-directional ultrasonic speaker is installed at a target position according to a sporting event in the sports stadium, and generates a super-directional sound source signal in an audible frequency band from the target position toward the visually impaired person.
The visually impaired person recognizes the target position according to whether the super-directional sound source signal is listened to and performs a sporting activity.
And a plurality of the super-directional ultrasonic speakers are installed on the boundary so that the super-directional sound source signal travels along the boundary between the sports stadium and the outside, and an acoustic fence is formed.
delete The method of claim 1,
When the sports stadium is a track and field stadium, the super-directional ultrasonic speaker is installed for each track, the ultrasonic speaker system, characterized in that different super-directional sound source signals are generated for each track.
The method of claim 1,
When the sport event is an archery, the target position is a target of the archery, and the super-directional ultrasonic speaker is installed on the target to generate the super-directional sound source signal toward the visually impaired .
The method of claim 1,
When the sport event is bowling, the target position is the position of the bowling pin, the super-directional ultrasonic speaker is installed in the position of the bowling pin is an ultrasonic speaker, characterized in that for generating the super-directional sound source signal toward the visually impaired system.
The method of claim 1,
When the sport event is a sport event that puts a goal in the goal, the target position is the goal, the super-directional ultrasonic speaker is installed at the location of the goal to generate the super-directional sound source signal toward the blind. An ultrasonic speaker system characterized by the above.

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