WO2014141577A1 - オーディオ再生装置およびオーディオ再生方法 - Google Patents
オーディオ再生装置およびオーディオ再生方法 Download PDFInfo
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- WO2014141577A1 WO2014141577A1 PCT/JP2014/000491 JP2014000491W WO2014141577A1 WO 2014141577 A1 WO2014141577 A1 WO 2014141577A1 JP 2014000491 W JP2014000491 W JP 2014000491W WO 2014141577 A1 WO2014141577 A1 WO 2014141577A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
Definitions
- the present disclosure relates to an audio playback device, and more particularly, to an audio playback device that forms a diffused sound field by playing back an audio signal from above and below a viewer.
- Patent Document 1 discloses an audio device (speaker device).
- the audio device includes a first speaker and a second speaker that are attached to each other in a vertical direction in the vehicle interior, and a drive control unit that outputs sound from the first speaker and the second speaker.
- the drive control unit performs a predetermined time delay on the sound output from the speaker having the shorter distance from the listener among the first speaker and the second speaker.
- the present disclosure can suppress a change in the distribution of the diffuse sound field when the reproduced sound of the signal generated using the stereo audio signal is output from the speakers disposed above and below the room, respectively.
- An audio playback device is provided.
- An audio reproduction device includes an acquisition unit that acquires a stereo audio signal including an L channel signal and an R channel signal, and (i) an upper part of a listening space using the acquired L channel signal and the R channel signal. And (ii) a correlation degree between the L channel signal and the R channel signal, and a second audio signal for the speaker disposed below the listening space.
- the audio reproduction device suppresses a change in the distribution of the diffuse sound field when the reproduction sound of the signal generated using the stereo audio signal is output from the speakers arranged above and below the room. can do.
- FIG. 1 is a diagram illustrating a configuration of a listening space in which a speaker is disposed above.
- FIG. 2 is a diagram for explaining a simple configuration of a listening space in which an upper speaker is used.
- FIG. 3 is a diagram for explaining a problem that occurs in the listening space configured as shown in FIG.
- FIG. 4 is a block diagram showing a functional configuration of the audio playback device according to the first embodiment.
- FIG. 5 is a flowchart of the operation of the audio playback device according to the first embodiment.
- FIG. 6 is a diagram for explaining the effect of suppressing the change in the sound field distribution of the audio playback device according to the first embodiment.
- FIG. 7 is a block diagram illustrating a functional configuration of the audio reproduction device according to the second embodiment.
- FIG. 1 is a diagram illustrating a configuration of a listening space in which a speaker is disposed above.
- lower speakers 106a to 106d are arranged around listeners 201a and 201b (below the listening space).
- An upper speaker 105 is disposed above the listeners 201a and 201b (above the listening space).
- FIG. 2 is a diagram for explaining a simple configuration of a listening space in which the upper speaker 105 is used.
- the upper speaker 105 is provided on the ceiling 207 of the room.
- An L channel speaker 106L and an R channel speaker 106R are provided on the floor 206 of the room.
- the reproduction sound of the stereo audio signal (L channel signal and R channel signal) is output from the L channel speaker 106L and the R channel speaker 106R as before, and the L channel signal and the R channel signal are combined.
- a configuration in which the reproduced sound of the received signal is output from the upper speaker 105 is conceivable.
- the sound field 205 shown in FIG. 2 is a visual representation of the sound field formed by the reproduced sound from the upper speaker 105, the L channel speaker 106L, and the R channel speaker 106R.
- FIG. 3 is a diagram for explaining a problem that occurs in the listening space configured as shown in FIG.
- the sound field formed by the reproduced sound is not biased upward or downward like the sound field 301 shown in FIG. Ideally it should be localized in position.
- the distribution of the sound field changes during sound reproduction. Specifically, the distribution of the sound field is biased upward like the sound field 302 shown in FIG. 3B, or the sound field 303 shown in FIG. A phenomenon occurs in which the distribution of the sound field is biased downward, giving the listener 201 a great sense of discomfort.
- the phenomenon close to this phenomenon is the same in the configuration in which all of the L channel speaker 106L, the R channel speaker 106R, and the upper speaker 105 shown in FIG. 2 are arranged around the listener 201 (approximately the same height). It is thought to occur.
- the present disclosure provides a sound field that is noticeably perceived by the listener 201 when a reproduced sound of a signal generated using a stereo audio signal is output from speakers arranged above and below a room.
- an audio playback device that suppresses changes in the distribution of sound. According to the audio reproduction device of the present disclosure, it is possible to provide a stable and comfortable sound field space for the listener 201, and its usefulness is very high.
- FIG. 4 is a block diagram showing a functional configuration of the audio playback device according to the first embodiment.
- FIG. 5 is a flowchart of the operation of the audio playback device according to the first embodiment.
- the audio reproduction device 10 shown in FIG. 4 is a device corresponding to the listening space shown in FIG.
- the upper speaker 105 is arranged above the listener 201 (the ceiling 207 of the room) as shown in FIG.
- lower speaker 106 L channel speaker 106L and R channel speaker 106R
- the upper speaker 105 is not necessarily disposed on the ceiling 207 as long as it is disposed above the L channel speaker 106L and the R channel speaker 106R.
- a control unit 107 an audio signal generation unit 101, a signal correlation calculation unit 102, a gain coefficient calculation unit 103, and a gain correction unit 104
- an upper speaker 105 an upper speaker 105.
- a lower speaker 106 an upper speaker 105.
- the acquisition unit 100 acquires a stereo audio signal including an L channel signal and an R channel signal (S101 in FIG. 5).
- the acquisition unit 100 is specifically an input interface such as an audio input terminal (audio input connector).
- the audio signal generation unit 101 uses the stereo audio signal 110 acquired by the acquisition unit 100 to generate an upper speaker signal 113 (first audio signal) and a lower speaker signal 114 (second audio signal) (see FIG. 5 S102).
- the upper speaker signal 113 is a signal for the upper speaker 105 disposed above the listening space
- the lower speaker signal 114 is a signal for the lower speaker 106 disposed below the listening space.
- the audio signal generation unit 101 generates a signal for interpolating the L channel signal and the R channel signal as the upper speaker signal 113. That is, the upper speaker signal 113 is a signal for filling a sound gap in the sound field space generated by the reproduced sound of the L channel signal and the reproduced sound of the R channel signal.
- the audio signal generation unit 101 generates the upper speaker signal 113 by smoothly interpolating the L channel signal and the R channel signal. For example, the audio signal generation unit 101 generates the upper speaker signal 113 by combining the L channel signal and the R channel signal based on the following expression.
- Ce indicates the upper speaker signal 113.
- L indicates an L channel signal
- R indicates an R channel signal.
- M and n represent contributions to the L channel signal and the R channel signal, respectively.
- m and n a constraint that m + n is 1 is imposed.
- “synthesize L channel signal and R channel signal” means R channel signal multiplied by a coefficient (real number other than 0) and a coefficient (real number other than 0). It means adding the signal.
- the audio signal generation unit 101 has the following formula: Based on the above, the upper speaker signal 113 is generated.
- the audio signal generation unit 101 generates the upper speaker signal 113 by adding the L channel signal multiplied by the positive coefficient and the R channel signal multiplied by the positive coefficient.
- the audio reproduction device 10 can generate a three-dimensional sound field 205 that envelops the listener 201. Thereby, for example, it is possible to provide the listener 201 with a comfortable sound field space that is wrapped in music.
- the audio signal generation unit 101 outputs (generates) the L channel signal and the R channel signal included in the stereo audio signal 110 as they are as the lower speaker signal 114. Specifically, the audio signal generation unit 101 generates an L channel signal as the lower speaker signal 114 for the L channel speaker 106L, and generates an R channel signal as the lower speaker signal 114 for the R channel speaker 106R.
- the audio signal generation unit 101 generates the L channel signal as the lower speaker signal 114 for one of the L channel speaker 106L and the R channel speaker 106R, and the R channel signal as the other speaker.
- the lower speaker signal 114 may be generated.
- the signal correlation calculation unit 102 calculates a signal correlation 111 between the L channel signal and the R channel signal included in the stereo audio signal 110. Then, the signal correlation calculation unit 102 outputs the calculated signal correlation 111 to the gain coefficient calculation unit 103.
- the signal correlation calculation unit 102 uses any method that can calculate information indicating the correlation between two signals of the L channel signal and the R channel signal, such as using a cross correlation function. It doesn't matter.
- the gain coefficient calculation unit 103 calculates a gain coefficient for gain correction of the upper speaker signal 113 based on at least the signal correlation 111 and the lower speaker signal 114 (S103 in FIG. 5). In other words, the gain coefficient calculation unit 103 determines the gain coefficient according to the degree of correlation between the L channel signal and the R channel signal.
- the gain coefficient calculation method of the gain coefficient calculation unit 103 will be described in detail. It is assumed that the upper speaker signal 113 is generated based on Equation 2 above. In the following description of the gain coefficient calculation method, the total signal energy of the upper speaker signal 113 is described as ECe, and the total signal energy of the lower speaker signal 114 is described as Es.
- the gain coefficient ⁇ is calculated (updated) every predetermined time (for example, 50 ms), and L and R in the following expression are each expressed by a vector composed of elements of the number of samples at the predetermined time.
- each element is a sample value of the signal level.
- the gain coefficient ⁇ is a coefficient for maintaining ECe and Es at a predetermined ratio k (arbitrary constant).
- the gain coefficient ⁇ and k, ECe, and Es have a relationship represented by the following expression. Note that the localization position of the sound field can be raised or lowered by changing the value of k. Specifically, the value of k is appropriately set according to the shape of the room.
- Equation 7 the gain coefficient ⁇ is calculated as Equation 7.
- the L 2 term and the R 2 term are values that do not depend on the degree of correlation between the L channel signal and the R channel signal, but the (L ⁇ R) term is the L channel signal.
- the value varies depending on the R channel signal and the degree of correlation. That is, the gain coefficient ⁇ is a parameter determined according to the degree of correlation between the L channel signal and the R channel signal.
- L and R are vectors, and the term L ⁇ R is a so-called inner product.
- the gain coefficient calculation unit 103 calculates the gain coefficient ⁇ (gain coefficient 112) based on the equation 7 and the signal correlation 111. Then, the gain coefficient calculation unit 103 outputs the calculated gain coefficient 112 to the gain correction unit 104.
- the gain correction unit 104 corrects the upper speaker signal 113 using the gain coefficient 112 output from the gain coefficient calculation unit 103 (S104 in FIG. 5). Specifically, the gain correction unit 104 multiplies the upper speaker signal 113 by the gain coefficient 112 and outputs a corrected upper speaker signal 115 obtained by the multiplication to the upper speaker 105.
- the calculation of the gain coefficient 112 of the gain coefficient calculation unit 103 and the correction (gain coefficient) of the gain correction unit 104 are performed every predetermined time.
- the control unit 107 (the gain coefficient calculation unit 103 and the gain correction unit 104) updates the gain coefficient 112 every predetermined time and multiplies the upper speaker signal 113.
- the upper speaker 105 is a speaker disposed above the listener 201.
- the upper speaker 105 reproduces the corrected upper speaker signal 115 output from the gain correction unit 104.
- the lower speaker 106 (L channel speaker 106L and R channel speaker 106R) is a speaker disposed below the upper speaker 105.
- the lower speaker 106 reproduces the lower speaker signal 114 input from the audio signal generation unit 101 (S105 in FIG. 5).
- the upper speaker signal 113 is generated by adding the L channel signal multiplied by the coefficient and the R channel signal multiplied by the coefficient. For this reason, the energy of the reproduced sound output from the upper speaker 105 varies in accordance with the degree of correlation between the L channel signal and the R channel signal, that is, the size of the (L ⁇ R) term. Due to this, the ratio between the energy of the reproduced sound output from the upper speaker 105 and the energy of the reproduced sound output from the lower speaker 106 varies, so that the sound field distribution changes.
- FIG. 6 is a diagram for explaining the effect of suppressing the change in the sound field distribution of the audio playback device 10.
- the vertical axis of the diagram shown in FIG. 6 is the dB value of the ratio of the energy of the sound output from the upper speaker 105 and the sound output from the lower speaker 106. In the example of FIG. 6, 0 is the target value. It shall be.
- the horizontal axis of the diagram shown in FIG. 6 is time.
- the “no correction” graph (thin line graph) shown in FIG. 6 is a graph when the correction using the gain coefficient 112 is not performed. on the other hand.
- the “with correction” graph (thick line graph) shown in FIG. 6 is a graph when correction using the above-described gain coefficient 112 is performed.
- the ratio between the sound energy output from the upper speaker 105 and the sound energy output from the lower speaker 106 is The fluctuation of the graph in the vertical axis direction is suppressed while approaching the target value. That is, from FIG. 6, the sound field is localized near a desired position by the correction using the gain coefficient 112 of the audio playback device 10, and the change in the sound field distribution is suppressed.
- the part where the “no correction” graph and the “correction” graph overlap is because the output sound is very small. In other words, the correction using the gain coefficient 112 is not performed. This is because, when the output sound is very small, if correction using the gain coefficient 112 is performed, an adverse effect may occur.
- the audio reproduction device 10 According to the audio reproduction device 10 according to the first embodiment, it is possible to suppress the change in the distribution of the diffuse sound field and to localize the diffuse sound field in the vicinity of the desired position. Can reduce the sense of incongruity.
- the gain coefficient calculation unit 103 multiplies the upper speaker signal 113 by the gain coefficient 112.
- the purpose of the audio playback device 10 is to keep the ratio of the energy of the reproduced sound output from the upper speaker 105 and the energy of the reproduced sound output from the lower speaker 106 as constant as possible.
- the gain coefficient calculation unit 103 calculates the gain coefficient 112 for the lower speaker signal 114, and the gain correction unit 104 corrects the lower speaker signal 114 by multiplying the lower speaker signal 114 by the calculated gain coefficient 112. Also good.
- the gain coefficient calculation unit 103 calculates the gain coefficient 112 for both the upper speaker signal 113 and the lower speaker signal 114, and the gain correction unit 104 calculates both the upper speaker signal 113 and the lower speaker signal 114. It may be corrected.
- the number of the upper speakers 105 and the number of the lower speakers 106 are not limited to the configurations shown in FIG. 1 and FIG.
- a plurality of upper speakers 105 may be arranged and a plurality of lower speakers 106 may be arranged.
- one of the sum of the signal energies of the plurality of upper speaker signals 113 and the sum of the signal energies of the plurality of lower speaker signals 114 is divided by the other.
- at least an operation for obtaining the square root of the value after division is performed. Then, for example, the calculated gain coefficient 112 is multiplied by each of the plurality of upper speaker signals 113 (or each of the plurality of lower speaker signals 114).
- the audio signal generation unit 101 generates the L channel signal and the R channel signal included in the stereo audio signal 110 as the lower speaker signal 114 as they are.
- the audio signal generation unit 101 may generate a signal obtained by synthesizing the L channel signal and the R channel signal as the lower speaker signal 114. In this way, in the audio reproduction device 10, by adding the L channel signal multiplied by the coefficient and the R channel signal multiplied by the coefficient, at least one of the upper speaker signal 113 and the lower speaker signal 114 is generated. Just do it.
- Embodiment 2 describes an audio playback device that generates a signal obtained by synthesizing an L channel signal and an R channel signal as a lower speaker signal 114.
- FIG. 7 is a block diagram illustrating a functional configuration of the audio reproduction device according to the second embodiment.
- an audio signal generation unit 401 and a gain coefficient calculation unit 403 are provided instead of the audio signal generation unit 101 and the gain coefficient calculation unit 103, respectively. Is different. That is, in the audio playback device 40, the operations of the audio signal generation unit 401 and the gain coefficient calculation unit 403 in the control unit 407 are different from those of the audio playback device 10.
- the number of upper speakers 105 and lower speakers 106 used is arbitrary, but in the following description, one upper speaker 105 and two lower speakers 106 are used. .
- the audio signal generation unit 401 generates a lower speaker signal 414 by combining (mixing) the L channel signal and the R channel signal included in the stereo audio signal 110 at a predetermined ratio. Then, the audio signal generation unit 401 outputs a lower speaker signal 414 to the lower speaker 106.
- the signal L ′ for the new L channel speaker 106L which is the lower speaker signal 414 generated by the audio signal generation unit 401
- the signal R ′ for the new R channel speaker 106R are calculated using the following equations. Is done.
- b is an arbitrary constant (b> 0).
- the audio signal generation unit 401 generates the upper speaker signal 113 based on Expression 2 and outputs it to the gain correction unit 104 as in the first embodiment.
- the gain coefficient calculation unit 403 calculates a gain coefficient for correcting the gain of the upper speaker signal 113 based on at least the signal correlation 111 and the lower speaker signal 414.
- the gain coefficient calculation method of the gain coefficient calculation unit 403 will be specifically described. It is assumed that the upper speaker signal 113 is generated based on Equation 2 above. In addition, it is assumed that the lower speaker signal 414 (L ′ and R ′) is generated based on Equation 8 above.
- the total signal energy Es ′ of the lower speaker signal 414 is expressed by the following equation.
- Equation 11 is obtained, and by transforming this, the gain coefficient ⁇ (gain coefficient 412) is calculated as in Equation 12.
- the gain correction unit 104 corrects the upper speaker signal 113 using the gain coefficient 412 generated and output by the gain coefficient calculation unit 403. Specifically, the gain correction unit 104 multiplies the upper speaker signal 113 by the gain coefficient 412 and outputs a corrected upper speaker signal 115 obtained by the multiplication to the upper speaker 105.
- the audio reproduction device 40 even when a signal obtained by combining the L channel signal and the R channel signal is generated as the lower speaker signal 114, an appropriate gain coefficient 412 is calculated and the sound field is calculated. Distribution change can be suppressed.
- Embodiments 1 and 2 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1 and 2 into a new embodiment.
- the listener 201 may set the value of k in Equation 7 or Equation 12 above.
- the audio playback device further includes an input reception unit that receives the setting of the k value of the listener 201, and the gain coefficient ⁇ is changed according to the value of k received by the input reception unit. Accordingly, the listener 201 can adjust the localization position in the vertical direction of the sound field to a desired position.
- a comprehensive or specific aspect of the technology in the present disclosure may be realized by a recording medium such as a system, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM.
- a comprehensive or specific aspect of the technology in the present disclosure may be realized by any combination of a system, a method, an integrated circuit, a computer program, and a recording medium.
- each component may be configured by dedicated hardware or may be realized by executing a software program suitable for each component.
- Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.
- the control unit described in the above embodiment may be realized as a DSP (Digital Signal Processor) or a function of the DSP.
- the present disclosure can be applied to an audio playback device used in a playback environment in which speakers are arranged so that fluctuations in the sound field distribution occur.
- the present disclosure can be applied to an AV amplifier or the like.
- Audio playback device 100 Acquisition unit 101, 401 Audio signal generation unit 102 Signal correlation calculation unit 103, 403 Gain coefficient calculation unit 104 Gain correction unit 105 Upper speaker 106, 106a, 106b, 106c, 106d Lower speaker 106L L channel speaker 106R R channel speaker 107, 407 Control unit 110 Stereo audio signal 111 Signal correlation 112, 412 Gain coefficient 113 Upper speaker signal 114, 414 Lower speaker signal 115 Corrected upper speaker signal 201, 201a, 201b Listeners 205, 301, 302 303 Sound field 206 Floor 207 Ceiling
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Abstract
Description
従来、スピーカ付の照明装置(照明器具)など、天井に配置することができるスピーカが知られている。このようにスピーカを天井に配置することで、部屋の上方からも音を出力させることができる。図1は、スピーカが上方に配置される受聴空間の構成を示す図である。
まず、実施の形態1に係るオーディオ再生装置の機能構成および動作について説明する。図4は、実施の形態1に係るオーディオ再生装置の機能構成を示すブロック図である。図5は、実施の形態1に係るオーディオ再生装置の動作のフローチャートである。
上記実施の形態1では、オーディオ信号生成部101は、ステレオオーディオ信号110に含まれるLチャネル信号およびRチャネル信号をそのまま下方スピーカ信号114として生成した。
以上のように、本出願において開示する技術の例示として、実施の形態1および2を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。また、上記実施の形態1および2で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。
以上のように、本開示における技術の例示として、実施の形態を説明した。そのために、添付図面および詳細な説明を提供した。
100 取得部
101、401 オーディオ信号生成部
102 信号相関算出部
103、403 ゲイン係数算出部
104 ゲイン補正部
105 上方スピーカ
106、106a、106b、106c、106d 下方スピーカ
106L Lチャネルスピーカ
106R Rチャネルスピーカ
107、407 制御部
110 ステレオオーディオ信号
111 信号相関
112、412 ゲイン係数
113 上方スピーカ信号
114、414 下方スピーカ信号
115 補正された上方スピーカ信号
201、201a、201b 受聴者
205、301、302、303 音場
206 床面
207 天井
Claims (6)
- Lチャネル信号およびRチャネル信号を含むステレオオーディオ信号を取得する取得部と、
(i)取得された前記Lチャネル信号および前記Rチャネル信号を用いて、受聴空間の上方に配置されたスピーカ用の第1オーディオ信号と、前記受聴空間の下方に配置されたスピーカ用の第2オーディオ信号とを生成し、(ii)前記Lチャネル信号と前記Rチャネル信号との相関度に応じてゲイン係数を決定し、前記第1オーディオ信号および前記第2オーディオ信号のうち少なくとも一方に対して決定したゲイン係数を乗算することにより、前記第1オーディオ信号の再生音のエネルギと、前記第2オーディオ信号の再生音のエネルギとの比率が所定の値に近づくように制御する制御部とを備え、
前記制御部は、前記Lチャネル信号と前記Rチャネル信号とを合成することにより、前記第1オーディオ信号および前記第2オーディオ信号の少なくとも一方を生成する
オーディオ再生装置。 - 前記制御部は、前記第1オーディオ信号の信号エネルギの総和、および、前記第2オーディオ信号の信号エネルギの総和のうち一方を他方によって除算し、かつ、除算後の値の平方根をとる演算を少なくとも行って前記ゲイン係数を決定する
請求項1に記載のオーディオ再生装置。 - 前記制御部は、前記ゲイン係数を所定の時間ごとに更新し、前記第1オーディオ信号および前記第2オーディオ信号のうち少なくとも一方に対して更新したゲイン係数を乗算する
請求項1または2に記載のオーディオ再生装置。 - 前記制御部は、
正の係数が乗算された前記Lチャネル信号と正の係数が乗算された前記Rチャネル信号とを加算する前記合成によって前記第1オーディオ信号を生成し、
前記Lチャネル信号と前記Rチャネル信号とを2つの前記第2オーディオ信号として生成する
請求項1~3のいずれか1項に記載のオーディオ再生装置。 - 前記制御部は、
正の係数が乗算された前記Lチャネル信号と正の係数が乗算された前記Rチャネル信号とを加算する前記合成によって前記第1オーディオ信号を生成し、
正の係数が乗算された前記Lチャネル信号と負の係数が乗算された前記Rチャネル信号とを加算する前記合成が行われた信号、および、正の係数が乗算された前記Rチャネル信号と負の係数が乗算された前記Lチャネル信号とを加算する前記合成が行われた信号を2つの前記第2オーディオ信号として生成する
請求項1~4のいずれか1項に記載のオーディオ再生装置。 - Lチャネル信号およびRチャネル信号を含むステレオオーディオ信号を取得する取得ステップと、
取得された前記Lチャネル信号および前記Rチャネル信号を用いて、受聴空間の上方に配置されたスピーカ用の第1オーディオ信号と、前記受聴空間の下方に配置されたスピーカ用の第2オーディオ信号とを生成する生成ステップと、
前記Lチャネル信号と前記Rチャネル信号との相関度に応じてゲイン係数を決定する決定ステップと、
前記第1オーディオ信号および前記第2オーディオ信号のうち少なくとも一方に対して決定したゲイン係数を乗算することにより、前記第1オーディオ信号の再生音のエネルギと、前記第2オーディオ信号の再生音のエネルギとの比率が所定の値になるように制御する制御ステップとを含み、
前記生成ステップにおいては、前記Lチャネル信号と前記Rチャネル信号とを合成することにより、前記第1オーディオ信号および前記第2オーディオ信号の少なくとも一方を生成する
オーディオ再生方法。
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US9774974B2 (en) * | 2014-09-24 | 2017-09-26 | Electronics And Telecommunications Research Institute | Audio metadata providing apparatus and method, and multichannel audio data playback apparatus and method to support dynamic format conversion |
JP2016177204A (ja) * | 2015-03-20 | 2016-10-06 | ヤマハ株式会社 | サウンドマスキング装置 |
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US20160044435A1 (en) | 2016-02-11 |
JP5591423B1 (ja) | 2014-09-17 |
JPWO2014141577A1 (ja) | 2017-02-16 |
US9497560B2 (en) | 2016-11-15 |
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