JP4282418B2 - Acoustic system - Google Patents

Description

  The present invention relates to an acoustic system that generates sound waves in an audible range only in a limited place in a golf course or the like.

  Traditionally, when a gallery watches a game at a golf tournament venue, the gallery can only see the play of the player watching the game. To understand the overall flow of the game, look at a large silent screen and scoreboard. I confirmed. This is because if the player hears sound, it may hinder play.

  Therefore, the gallery can recognize the current ranking of the players by checking the silent large screen and scoreboard, but it is not possible to recognize the flow of the game, such as how the ranking has changed. There was a problem that it was not possible.

  Also, the gallery cannot see the technical and historical explanations when watching players on the TV, radio, etc., and cannot effectively watch golf tournaments. There was a problem.

  It is an object of the present invention to provide an audio system that provides an explanation of game content only to a gallery without hindering a player.

The present invention, in a sound system to provide voice information using the parametric speaker against gallery on gallery stand to watch the player during the competition in golf, is installed in the lower gallery stand, reflected by galleries and gallery stand In order not to reflect the sound to the player who is playing the game, the projector is equipped with a radiator that emits an ultrasonic wave at an angle along the upper direction of the gallery stand and generates an audible sound wave in a limited range.

  According to the present invention, it is possible to amplify the voice of the commentary to the gallery during a game such as a golf tournament where the voice of the commentary or the like could not be loudened due to a problem such as being unable to concentrate when heard by the player. It becomes possible.

  In addition, it is possible to create a uniform sound field only in places where spectators gather, such as gallery stands, which not only enables voice amplification during golf tournaments, but also a special environment for the spectators (may be charged) Can be provided.

Embodiment 1 FIG.
FIG. 1 is a block diagram of an acoustic system according to Embodiment 1 of the present invention. As shown in the figure, the acoustic system includes a sound source 1, a modulator 2, an amplifier 3, and a radiator 4. The sound source 1 generates an audible sound signal. The modulator 2 modulates a carrier wave belonging to the ultrasonic band with an audio signal. The amplifier 3 amplifies the modulation signal output from the modulator 2. The radiator 4 radiates the signal output from the amplifier 3 into the air. This acoustic system applies the principle of a parametric speaker that converts an audible sound into an ultrasonic wave (non-audible sound) having high straightness and radiates in a target direction.

Here, the basic principle of the parametric speaker will be described.
Parametric loudspeakers employ the principle of obtaining sound in the audible band by using distortion components generated in the process of strong ultrasonic waves propagating through the air. FIG. 2 is a diagram for explaining the principle of a parametric speaker. FIG. 2 shows two frequency components f1 and f2, and a difference component f2-f 1 and a sum component f2 + f1. Parametric speaker is one that utilizes the two frequency components f1, f2 and the relationship of the difference component f2-f 1, this time the two frequency components f1, f2 is referred to as an ultrasonic inaudible to humans, the difference component f2 An audible sound can be obtained by making −f 1 exist in the audio band. This is the basic principle, but the interaction of ultrasonic waves utilizes the nonlinearity of air, in which strong ultrasonic waves are distorted in the propagation process.

  The modulator 2 in FIG. 1 modulates the ultrasonic carrier signal with the audio signal output from the sound source 1 and supplies the modulated signal to the amplifier 3. The amplifier 3 amplifies the acquired signal and supplies it to the radiator 4. The radiator 4 emits the acquired modulation signal. The modulated signal radiated from the radiator 4 is self-demodulated by a non-linear parametric phenomenon of air to obtain an audible sound.

  The modulator 2 has a function of creating two ultrasonic components corresponding to the audio signal as described above. That is, the modulator 2 generates a signal having a carrier signal component and sidebands, and these carrier signal component and sidebands constitute two frequency components. As a modulation method, an amplitude modulation method is common.

  FIG. 3 is a diagram showing a usage example of the acoustic system according to the first embodiment. As shown in the figure, the sound system is installed so that the radiator 4 faces the gallery stand 5 for watching the green 6. The radiator 4 radiates the signal supplied from the amplifier 3 toward the gallery stand 5. Since the modulation signal is an ultrasonic wave, the sound signal reproduced in the air can also have a strong directivity, so that only those who need it (Gallery) can hear the sound and those who do not want to hear it (Player) A sound field that cannot be heard can be formed. Therefore, by using such an acoustic system, it becomes possible to make a comment on the game louder only to the audience without being heard by the player.

  In FIG. 3, nine acoustic systems are arranged. The modulation signal radiated from the radiator 4 is amplified in the air with a spread of about 20 °. By installing as shown in FIG. 3, it is possible to spread the sound uniformly only within a necessary range such as a gallery stand.

The super-directional acoustic system as described above may be affected by reflection because it uses ultrasonic waves. FIG. 4 is a diagram for explaining the reflection direction of the modulation signal. As shown in the figure, the gallery stand 5 is usually constructed in a platform form. The radiator 4 is installed at the lowest stage of the gallery stand 5. The radiator 4 installed in this manner radiates a modulation signal toward the gallery 7 in an obliquely upward direction as shown in FIG. Therefore, the reflected sound is reflected in the direction of the arrow in FIG. Note that the installation angle of the radiator 4 needs to be designed according to the structure of the gallery stand 5 .

  As described above, according to the first embodiment, it is possible to obtain an effect that it is possible to amplify a sound such as a game commentary to the gallery during a game such as a golf tournament.

  In addition, it is possible to form a uniform sound field only in places where spectators gather, such as a gallery stand, and not only enable voice amplification during golf tournaments, but also provide a special environment for the audience. A possible effect is obtained.

  Note that the acoustic system may include an antenna and a receiver instead of the sound source 1, and may receive audio information transmitted from a golf course management center or the like to perform the above-described modulation or the like.

1 is a block diagram of an acoustic system according to Embodiment 1 of the present invention. It is a figure explaining the principle of a parametric speaker. It is a figure which shows the usage example of the acoustic system by Embodiment 1 of this invention. It is a figure explaining the reflective direction of a modulation signal .

Explanation of symbols

  1 sound source, 2 modulator, 3 amplifier, 4 radiator, 5 gallery stand, 6 green, 7 gallery.

Claims (2)

In an acoustic system for providing audio information using a parametric speaker to a gallery on a gallery stand for watching a player who is competing on a golf course,
A limited range that is installed at the lower stage of the gallery stand and emits ultrasonic waves at an angle along the upper stage direction of the gallery stand so as not to reflect the sound reflected by the gallery and the gallery stand to the player in the competition. System with a radiator that generates sound waves in the audible range.   The acoustic system according to claim 1, wherein a plurality of radiators are installed in front of the gallery stand, and a uniform sound field is formed only within a range where the gallery of the gallery stand exists.

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