WO2022180685A1 - 音響システム - Google Patents
音響システム Download PDFInfo
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- WO2022180685A1 WO2022180685A1 PCT/JP2021/006870 JP2021006870W WO2022180685A1 WO 2022180685 A1 WO2022180685 A1 WO 2022180685A1 JP 2021006870 W JP2021006870 W JP 2021006870W WO 2022180685 A1 WO2022180685 A1 WO 2022180685A1
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- speaker unit
- sound
- acoustic signal
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- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 21
- 230000005236 sound signal Effects 0.000 description 16
- 238000002474 experimental method Methods 0.000 description 8
- 210000005069 ears Anatomy 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
- H04R5/023—Spatial or constructional arrangements of loudspeakers in a chair, pillow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
- H04R1/347—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers for obtaining a phase-shift between the front and back acoustic wave
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
- H04R2203/12—Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to sound reproduction technology that can be used in audio systems installed in seats of aircraft, automobiles, and the like.
- Non-Patent Document 1 users used earphones and headphones to watch movies and listen to music on airplanes (see Non-Patent Document 1). This is because the use of a speaker causes the reproduced sound to reach the surroundings of the user, causing annoyance to other users.
- wearing earphones and headphones is a hassle for users.
- some users do not like wearing them because their hairstyles are messed up.
- Some users do not like the pressure on the ears caused by wearing them.
- wearing earphones or headphones for a long time may cause the user to feel tired.
- an object of the present invention is to provide an acoustic system for users who use seats in airplanes, automobiles, etc., which reproduces sounds inaudible to surrounding users without using earphones or headphones.
- One aspect of the present invention is to generate a first processed acoustic signal from an acoustic signal of a predetermined sound source (hereinafter referred to as a first acoustic signal) by performing predetermined signal processing, a directionality control device including at least one directionality control unit that generates a second processed sound signal from the sound signal of (hereinafter referred to as a second sound signal), and emits sound based on the first processed sound signal
- a speaker system including at least one speaker unit pair including a speaker unit (hereinafter referred to as a positive speaker unit) and a speaker unit (hereinafter referred to as a negative speaker unit) that emits sound based on the second processed acoustic signal and , wherein the signal processing performed by the directivity control unit is performed by dividing the sound emitted from the positive speaker unit of the speaker unit pair and the sound emitted from the negative speaker unit of the speaker unit pair.
- This is a process for making the sound to be heard in an area near the speaker unit pair
- N is an integer equal to or greater than 1, and a 2n-1 acoustic signal that is an acoustic signal of a predetermined sound source and a 2n-th acoustic signal that is an acoustic signal having an opposite phase to the 2n-1 acoustic signal.
- An n-th speaker unit pair (n 1, ..., N)
- the sound emitted from the second speaker unit and the sound emitted from the negative speaker unit of the nth speaker unit pair can be heard in the audible area near the nth speaker unit pair and shall be audible. This is a process that prevents listening in an area that should not be heard.
- FIG. 2 is a diagram for explaining directivity of sound emitted from a speaker
- FIG. FIG. 4 is a diagram for explaining directivity of sound emitted from a speaker unit
- FIG. 4 is a diagram for explaining sounds emitted from a pair of speaker units
- FIG. 4 is a diagram for explaining directivity of sound emitted from a pair of speaker units; It is a figure which shows the state of experiment (positional relationship of a speaker and a microphone). It is a figure which shows the state of experiment (positional relationship of a speaker unit and a microphone).
- FIG. 4 is a diagram showing an experiment (positional relationship between speaker unit pairs and microphones); It is a figure which shows the mode of experiment (another measurement position).
- FIG. 1 shows an example of a sound system installed in an aircraft seat;
- FIG. 1 is a block diagram showing an example of the configuration of an audio system 100;
- FIG. FIG. 4 is a diagram showing how sound is emitted from a pair of speaker units;
- 2 is a block diagram showing an example of the configuration of an acoustic system 200;
- FIG. 2 is a block diagram showing an example of the configuration of an acoustic system 202;
- FIG. 12 is a diagram showing an example of the configuration of a speaker unit pair 122 to which a member 1224 is attached; 1 is a diagram showing an example of a sound system installed in a car seat; FIG. 1 is a diagram showing an example of a sound system installed in a car seat; FIG.
- a speaker usually consists of a speaker unit and a speaker box.
- a speaker unit is a component that includes a diaphragm that converts an acoustic signal, which is an electrical signal, into air vibrations (that is, generates sound waves).
- the speaker box is a component that accommodates the speaker unit.
- FIG. 1 is a diagram for explaining the directivity of sound emitted from a speaker. As shown in FIG. 1, positive sound waves will be radiated from the speaker in all directions, while negative sound waves will not leave the speaker box. As a result, the sound emitted from the speaker can be heard over a wide range.
- FIG. 2 is a diagram for explaining the directivity of sound emitted from a speaker unit.
- the directivity of sound emitted from a speaker unit which is a bare speaker
- FIG. 2 is a diagram for explaining the directivity of sound emitted from a speaker unit.
- the sound emitted from the speaker unit has bidirectional characteristics.
- the present invention utilizes this bidirectionality.
- two speaker units are arranged to form a speaker unit pair.
- the diaphragms of the two speaker units vibrate and emit sounds based on these two acoustic signals.
- sounds in all directions are eliminated except for the vicinity of the pair of speaker units. That is, the sound is muted only at positions sufficiently distant from the speaker unit pair, and the sound is not muted near the speaker unit pair.
- the reason why the sound is not canceled in the vicinity of the speaker unit pair is that the phases of the sound wave radiated from the front of the speaker unit and the sound wave coming around from the back of the speaker unit do not match in the vicinity of the speaker unit pair.
- 9, 10, 11, and 12 are diagrams showing experimental results, showing the relationship between frequency and attenuation under conditions 1, 2, 3, and 4, respectively.
- Each figure shows four curves, one curve pointed by an arrow is the sound picked up by a microphone located 5 cm or 2 cm from the front, and the other three curves are the front, The sound was picked up by a microphone located 100 cm from the back and sides.
- the curve at the position of 5 cm or 2 cm from the front is located near the speaker or the like, so the gain is very large. Therefore, in order to make it easier to see, the curve at the position 5 cm from the front is plotted at -25 dB from the three curves at the position 100 cm.
- a system that reproduces an acoustic signal obtained based on an object to be reproduced is called an audio system.
- the acoustic system includes a speaker system for emitting an acoustic signal as sound (hereinafter, this sound is referred to as sound based on the acoustic signal).
- the speaker system is a device that converts an acoustic signal, which is an analog signal, into sound.
- the object to be reproduced is, for example, data recorded on a CD, DVD, or record, data received via the Internet, or a signal received by radio broadcasting or television broadcasting. data or signals from which
- FIG. 13 is a diagram showing an example of an acoustic system installed in an aircraft seat.
- the sound system in FIG. 13 is installed on a seat so as to sandwich the head of a seated user, and two pairs of speaker units are arranged near the left and right ears.
- Such a sound system can be installed in vehicles other than aircraft such as automobiles and trains, in reclining chairs, etc., and can also be installed in a wearable form such as being carried on the shoulder.
- a driver unit pair in which two driver units are arranged, may be installed in each of the left and right units of the headphone or earphone, which corresponds to the speaker unit pair.
- Headphones are generally divided into two types: open type and closed type. Applying the above technology to the open type, which is particularly concerned about sound leakage, reduces sound leakage. There is expected.
- FIG. 14 is a block diagram showing the configuration of the audio system 100.
- the acoustic system 100 includes a playback device 110 and a speaker system 120.
- the speaker system 120 is a speaker system.
- the playback device 110 includes N (where N is an integer equal to or greater than 1) playback units 112 (that is, the first playback unit 112, . . . , the Nth playback unit 112).
- the speaker system 120 also includes N speaker unit pairs 122 (that is, the first speaker unit pair 122, . . . , the Nth speaker unit pair 122).
- Speaker unit pair 122 includes two speaker units (ie, positive speaker unit 1221 and negative speaker unit 1221).
- the negative speaker unit 1221 receives an acoustic signal that is opposite in phase to the acoustic signal that is input to the positive speaker unit 1221 .
- the speaker system 120 is installed near the head of the user who uses the seat.
- the nth user direction is the front direction of the positive speaker unit 1221 and the negative speaker unit 1221 of the nth speaker unit pair 122 .
- the direction opposite to the n-th user direction is the back direction of the positive speaker unit 1221 and the negative speaker unit 1221 of the n-th speaker unit pair 122 .
- the sound can be heard only near the seat where the speaker system 120 is installed, as described in ⁇ Technical Background>.
- the sound emitted from the negative speaker unit 1221 of the n-th speaker unit pair 122 toward the n-th user and the sound emitted from the negative speaker unit 1221 of the n-th speaker unit pair 122 in the direction opposite to the n-th user direction The generated sounds are in opposite phase relation to each other.
- FIG. 15 is a diagram showing how sounds are emitted from a pair of speaker units.
- SPU in the figure represents a speaker unit.
- the sound emitted from each speaker unit cancels each other in the middle area of the two speaker units, so the sound emitted from the speaker unit pair cannot be heard. and the user cannot hear the sound.
- the speaker unit pair installed near the left ear the user cannot hear the sound because the area where the sound emitted from the speaker unit pair can be heard is shifted from the position of the ear.
- the directivity of the sound emitted from the speaker unit pair is controlled.
- an acoustic system that performs directivity control processing will be described.
- FIG. 16 is a block diagram showing the configuration of the audio system 200.
- the acoustic system 200 includes a playback device 110, a directivity control device 210, and a speaker system 120.
- the directivity control device 210 includes N directivity control units 212 (that is, the first directivity control unit 212, . . . , the Nth directivity control unit 212).
- Sound system 200 differs from sound system 100 in that a directivity control device 210 is included.
- the directivity control device 210 receives the 1st acoustic signal, the 2nd acoustic signal, . , a second processed acoustic signal obtained by signal processing the second acoustic signal, . . . , a 2Nth processed acoustic signal obtained by performing signal processing on the 2Nth acoustic signal.
- the n-th directivity control unit 212 receives the 2n ⁇ 1 acoustic signal and the 2n-th acoustic signal, and executes predetermined signal processing to obtain the Generating the 2n-1 processed audio signal from the 2n-1 audio signal, generating the 2n processed audio signal from the 2n audio signal, and outputting the 2n-1 processed audio signal and the 2n processed audio signal do.
- the predetermined signal processing is, for example, filtering using an FIR (Finite Impulse Response) filter.
- FIR Finite Impulse Response
- Microphones placed in areas where they should not be used should be designed so that the value of the filter coefficient approaches zero. A specific description will be given below. Areas that should be audible and areas that should not be audible should be designed according to the case. For example, consider the case of installing in a seat of an automobile (hereinafter referred to as seat S). The position where the ears come when the user using the seat S moves his/her head or changes the direction of the face should be included in the audible area, and the seats close to the seat S (e.g. The position where the ears come when the user using the seat) moves their head or turns their face should be included in the area that should not be audible.
- seat S The position where the ears come when the user using the seat S moves his/her head or changes the direction of the face should be included in the audible area, and the seats close to the seat S (e.g. The position where the ears come when the user using the seat) moves their head or turns their face should be included in the area that should not be audible.
- microphones installed in a rectangular parallelepiped area that includes a seat close to the seat S but does not include the seat S have filter coefficient values close to zero.
- the filter coefficient values of the microphones placed in the middle area should approach 1.
- the area that should be the audible area is the nth speaker, where the sound emitted from the positive speaker unit of the nth speaker unit pair cancels out the sound emitted from the negative speaker unit of the nth speaker unit pair. It contains points equidistant from the positive speaker unit of the unit pair and the negative speaker unit of the nth speaker unit pair.
- the speaker system 120 receives the 1st processed acoustic signal, the 2nd processed acoustic signal, .
- a sound based on the 2 processed acoustic signal, . . . , a sound based on the 2N processed acoustic signal is emitted.
- the n-th speaker unit pair 122 receives the 2n-1 processed acoustic signal and the 2n-th processed acoustic signal as inputs, and outputs the 2n-1 processed acoustic signal is emitted from the positive speaker unit 1221 , and the sound based on the 2n-th processed acoustic signal is emitted from the negative speaker unit 1221 .
- FIG. 17 is a block diagram showing the configuration of the audio system 202.
- the sound system 202 includes a playback device 110, a directivity control device 210, and a speaker system 120, like the sound system 200.
- sound system 202 differs from sound system 200 in that member 1224 is attached to speaker unit pair 122 .
- a member 1224 is attached to the n-th speaker unit pair 122 for absorbing sound emitted from the positive speaker unit 1221 and the negative speaker unit 1221 of the n-th speaker unit pair 122 in the opposite direction to the n-th user direction. (See FIG. 18).
- the member 1224 may be any member that can prevent high frequency sound from radiating in the back. Instead of installing the member 1224 only on the back surface of the speaker unit pair 122, the member 1224 may be installed so as to surround the speaker unit pair 122 other than the front surface.
- Example of a sound system installed in a car seat 19 and 20 are diagrams showing an example of the sound system installed in the seat of an automobile, respectively.
- a pair of speaker units are installed in the headrest of a car seat.
- a speaker unit pair is installed on an arm attached to a seat of an automobile.
- the arm may be movable.
- Examples other than automobile seats, specifically seats for game machines such as pachinko and slot machines, will be described.
- a user takes a seat in front of a game machine and enjoys playing games on the game machine. Therefore, for the seat for the game table, an arm as described in the example of the automobile may be installed so that the speaker unit pair is positioned near the ears of the user seated on the seat.
- the arm since the seat for the game machine may not have a backrest, the arm may be installed on the game machine instead of installing the arm on the seat.
- the arm may be movable so that the user himself/herself adjusts the speaker unit pair so that it is near the ear.
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Abstract
Description
まず、スピーカから放音される音の指向性について説明する。次に、本願発明のスピーカユニットペアから放音される音の指向性について説明する。最後に、本願発明のスピーカユニットペアの効果を確認する実験の結果について説明する。
通常、スピーカは、スピーカユニットとスピーカボックスで構成される。スピーカユニットとは、電気信号である音響信号を空気の振動に変換する(つまり、音波を生成する)振動板を含む構成部である。また、スピーカボックスとは、スピーカユニットを収納する構成部である。
ここでは、まず、裸のスピーカであるスピーカユニットから放音される音の指向性について説明する。図2は、スピーカユニットから放音される音の指向性を説明するための図である。スピーカユニットのみの場合、スピーカの場合と異なり、スピーカボックスの中に隠れているスピーカユニットの背面から負の音波が放射される。そのため、図2に示すように、スピーカユニットから放音される音は、双指向性という特性を有する。
ここでは、スピーカ、スピーカユニット、スピーカユニットペアの周波数特性を測定する実験の結果について説明する。実験では、スピーカ、スピーカユニット、スピーカユニットペアとして、直径が4.5cmの振動板を有するスピーカ(図5参照)、当該スピーカからスピーカボックスを外しスピーカユニットのみとしたもの(図6参照)、当該スピーカユニットを2つ並べたもの(図7参照)を用いた。また、スピーカ、スピーカユニット、スピーカユニットペアの近傍の周波数特性を測定するために、以下の4つの条件でマイクを設置した。
(条件2)スピーカユニットの正面から5cmの位置
(条件3)スピーカユニットの正面から2cmの位置
(条件4)スピーカユニットペアの正面から2cmの位置
また、いずれの条件についても、比較のために、スピーカ、スピーカユニット、スピーカユニットペアの正面、背面、側面からそれぞれ100cmの位置にもマイクを設置した(図8参照)。
再生対象物に基づいて得られる音響信号を再生するシステムを音響システムという。音響システムは、音響信号を音(以下、この音のことを音響信号に基づく音という)として放音するためにスピーカシステムを含む。ここで、スピーカシステムは、アナログ信号である音響信号を音に変換する装置である。また、再生対象物とは、例えば、CD、DVD、レコードに記録されたデータや、インターネットにより受信されたデータや、ラジオ放送、テレビ放送により受信された信号のように、所定の処理により音響信号を得ることができるデータや信号のことである。
図15は、スピーカユニットペアから放音される音の様子を示す図である。図中のSPUは、スピーカユニットを表す。右耳の近くに設置されたスピーカユニットペアの場合、各スピーカユニットからの音が2つのスピーカユニットの中間領域では互いに打ち消しあうことにより、スピーカユニットペアから放音される音を聴くことができない領域が生じ、ユーザに音が聴こえない。一方、左耳の近くに設置されたスピーカユニットペアの場合、スピーカユニットペアから放音される音を聴くことができる領域が耳の位置からずれてしまうことにより、ユーザに音が聴こえない。このような問題を解決するために、スピーカユニットペアから放音される音の指向性を制御する。ここでは、指向性制御処理を行う音響システムについて説明する。
ここでは、吸音特性がある部材を用いることにより、高域の音が漏れにくい音響システムについて説明する。
図19、図20は、それぞれ自動車の座席に設置された音響システムの一例を示す図である。図19の例は、スピーカユニットペアを自動車の座席のヘッドレストに設置したものである。具体的には、N=2とし、第1スピーカユニットペアと第2スピーカユニットペアが、自動車の座席のヘッドレストに設置される。一方、図20の例は、スピーカユニットペアを自動車の座席の取り付けられるアームに設置したものである。具体的には、N=2とし、自動車の座席を利用するユーザの頭を挟むように、当該座席に取り付けられる2本のアームにそれぞれ設置される。なお、アームは可動式となっていてもよい。
自動車の座席以外の例、具体的には、パチンコやスロットのような遊技台用の座席について、説明する。通常、ユーザは遊技台の前の座席を利用し、当該遊技台での遊技に興じる。したがって、遊技台用の座席についても、自動車の例で説明したようなアームを設置し、当該座席に着席したユーザの耳がくる位置付近にスピーカユニットペアがくるようにしてもよい。なお、遊技台用の座席は背もたれがないことがあるため、座席にアームを設置する代わりに、遊技台にアームを設置するようにしてもよい。また、アームを可動式とし、耳付近にスピーカユニットペアがくるように、ユーザ自身に調整させるようにしてもよい。
上述の本発明の実施形態の記載は、例証と記載の目的で提示されたものである。網羅的であるという意思はなく、開示された厳密な形式に発明を限定する意思もない。変形やバリエーションは上述の教示から可能である。実施形態は、本発明の原理の最も良い例証を提供するために、そして、この分野の当業者が、熟考された実際の使用に適するように本発明を色々な実施形態で、また、色々な変形を付加して利用できるようにするために、選ばれて表現されたものである。すべてのそのような変形やバリエーションは、公正に合法的に公平に与えられる幅にしたがって解釈された添付の請求項によって定められた本発明のスコープ内である。
Claims (6)
- 所定の信号処理を実行することにより、所定の音源の音響信号(以下、第1音響信号という)から第1処理済音響信号を生成し、第1音響信号と逆位相の音響信号(以下、第2音響信号という)から第2処理済音響信号を生成する指向性制御部を少なくとも1つ含む指向性制御装置と、
第1処理済音響信号に基づく音を放音するスピーカユニット(以下、正のスピーカユニットという)と、第2処理済音響信号に基づく音を放音するスピーカユニット(以下、負のスピーカユニットという)とを含むスピーカユニットペアを少なくとも1つ含むスピーカシステムと、
を含む音響システムであって、
前記指向性制御部が実行する信号処理は、前記スピーカユニットペアの正のスピーカユニットから放音される音と前記スピーカユニットペアの負のスピーカユニットから放音される音を、前記スピーカユニットペアの近傍の可聴とすべき領域では聴くことができ、可聴とすべきでない領域では聴くことができないようにする処理である
音響システム。 - 請求項1に記載の音響システムであって、
前記可聴領域とすべき領域は、前記スピーカユニットペアの正のスピーカユニットから放音される音と前記スピーカユニットペアの負のスピーカユニットから放音される音が打ち消しあう、前記スピーカユニットペアの正のスピーカユニットと前記スピーカユニットペアの負のスピーカユニットから等距離にある点を含む
ことを特徴とする音響システム。 - Nを1以上の整数とし、
所定の音源の音響信号である第2n-1音響信号と、第2n-1音響信号と逆位相の音響信号である第2n音響信号とを出力する第n再生部(n=1, …, N)を含む再生装置と、
所定の信号処理を実行することにより、第2n-1音響信号から第2n-1処理済音響信号を生成し、第2n音響信号から第2n処理済音響信号を生成する第n指向性制御部(n=1, …, N)を含む指向性制御装置と、
第2n-1処理済音響信号に基づく音を放音するスピーカユニット(以下、正のスピーカユニットという)と、第2n処理済音響信号に基づく音を放音するスピーカユニット(以下、負のスピーカユニットという)とを含む第nスピーカユニットペア(n=1, …, N)を含むスピーカシステムと、
を含む音響システムであって、
第n指向性制御部(n=1, …, N)が実行する信号処理は、第nスピーカユニットペアの正のスピーカユニットから放音される音と第nスピーカユニットペアの負のスピーカユニットから放音される音を、第nスピーカユニットペアの近傍の可聴とすべき領域では聴くことができ、可聴とすべきでない領域では聴くことができないようにする処理である
音響システム。 - 請求項3に記載の音響システムであって、
前記可聴領域とすべき領域は、第nスピーカユニットペアの正のスピーカユニットから放音される音と第nスピーカユニットペアの負のスピーカユニットから放音される音が打ち消しあう、第nスピーカユニットペアの正のスピーカユニットと第nスピーカユニットペアの負のスピーカユニットから等距離にある点を含む
ことを特徴とする音響システム。 - 請求項3に記載の音響システムであって、
N=2であり、
第1スピーカユニットペアと第2スピーカユニットペアは、自動車の座席のヘッドレストに設置される
ことを特徴とする音響システム。 - 請求項3に記載の音響システムであって、
N=2であり、
第1スピーカユニットペアと第2スピーカユニットペアは、自動車の座席を利用するユーザの頭を挟むように、当該座席に取り付けられる2本のアームにそれぞれ設置される
ことを特徴とする音響システム。
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Citations (6)
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JPS6195189U (ja) * | 1984-11-28 | 1986-06-19 | ||
JPH0833086A (ja) * | 1994-07-19 | 1996-02-02 | Biiba Kk | アクティブ狭指向性スピーカ |
JP2006345477A (ja) * | 2005-05-13 | 2006-12-21 | Sony Corp | 音響再生方法および音響再生システム |
JP2010045574A (ja) * | 2008-08-12 | 2010-02-25 | Sony Corp | ハンズフリー通話装置、ハンズフリー通話機能付き音響再生装置、ハンズフリー通話方法 |
JP2011172074A (ja) * | 2010-02-19 | 2011-09-01 | Nippon Telegr & Teleph Corp <Ntt> | 局所再生装置とその方法と、プログラム |
WO2019139103A1 (ja) * | 2018-01-12 | 2019-07-18 | ソニー株式会社 | 音響装置 |
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2021
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JPS6195189U (ja) * | 1984-11-28 | 1986-06-19 | ||
JPH0833086A (ja) * | 1994-07-19 | 1996-02-02 | Biiba Kk | アクティブ狭指向性スピーカ |
JP2006345477A (ja) * | 2005-05-13 | 2006-12-21 | Sony Corp | 音響再生方法および音響再生システム |
JP2010045574A (ja) * | 2008-08-12 | 2010-02-25 | Sony Corp | ハンズフリー通話装置、ハンズフリー通話機能付き音響再生装置、ハンズフリー通話方法 |
JP2011172074A (ja) * | 2010-02-19 | 2011-09-01 | Nippon Telegr & Teleph Corp <Ntt> | 局所再生装置とその方法と、プログラム |
WO2019139103A1 (ja) * | 2018-01-12 | 2019-07-18 | ソニー株式会社 | 音響装置 |
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