任意のスピーカ配置に対応した
複数領域音場制御技術
国立研究開発法人情報通信研究機構
先進的音声翻訳研究開発推進センター
先進的音声技術研究室
主任研究員

岡本 拓磨

1

研究背景
多チャネルスピーカ(=スピーカアレイ)を用いた局所再生・マルチスポット
再生・マルチ音場制御(1) 局所再生：音圧のみを制御ある領域にのみある特定の音が聞こえ他の場所では聞こえない

Bright zone
(Listening area)

こんにちはJapanesearea<latexit sha1_base64="(null)">(null)</latexit><latexit sha1_base64="(null)">(null)</latexit>

English
area

Hello

<latexit sha1_base64="(null)">(null)</latexit>

Dark zone(Quiet area)<latexit sha1_base64="(null)">(null)</latexit>你好

Chinesearea<latexit sha1_base64="(null)">(null)</latexit>(a) 局所再生(b) マルチスポット再生(2) マルチスポット再生：音圧のみを制御，(a)の重ね合わせ
それぞれの領域にそれぞれ別の音が聞こえる(3) マルチ音場制御：音圧だけでなく波面そのものを制御
それぞれの領域で別々の音場を同時に再現

無音

届けたい人だけに必要な音を届ける技術
如何に「音が聞こえない領域」を形成するか(c) マルチ音場制御

2類似技術との比較
ヘッドセットメリット：他への音漏れがない，音質がよい
デメリット：人数分を用意する必要がある，接触型であるため感染対策的に懸念あり

超音波スピーカ
メリット：個人ごとのデバイス不要，鋭い指向性，非接触
デメリット：音質が悪い，超音波領域では150 dB以上の音圧レベル(健康被害への懸念)

スピーカアレイを用いた局所再生・マルチスポット再生
メリット：個人ごとのデバイス不要，鋭い指向性，非接触，健康被害なし，音質がよい
研究課題：制御精度向上，小型化，実用化

ヘッドセットや超音波スピーカに変わる
新たな音提示システムとして重要な研究課題

3

本日の発表の概要
研究背景・類似技術との比較

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Rq
Cylindricalba✏e<latexit sha1_base64="4Dyi8hfBeATTsUj8rZHzcqFfm9w=">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</latexit><latexit sha1_base64="eB3ED7x+wvZmfbFTHa6tV28iddE=">AAACbnichVFNSwJRFD1OX2YfWkEEEUliuJKni4pWgpuWfuQHmMjM+LTBcWaYGQWT/kD7aBEUBRHRz2jTH2jhT4g2gUGbFl3HgSip7jDzzj3vnjvn3ScZqmLZjPU8wtj4xOSUd9o3Mzs37w8sLOYtvWXKPCfrqm4WJdHiqqLxnK3YKi8aJhebksoLUiM52C+0uWkpurZvdwxebop1TakpsmgTVUp2SFg1KVUrgRCLMieCoyDmghDcSOmBWxygCh0yWmiCQ4NNWIUIi54SYmAwiCujS5xJSHH2OY7hI22LqjhViMQ26FunrOSyGuWDnpajlukvKr0mKYMIsyd2x/rskd2zZ/bxa6+u02PgpUOrNNRyo+I/Wcm+/6tq0mrj8Ev1p2cbNew4XhXybjjM4BTyUN8+OutndzPh7ia7Zi/k/4r12AOdQGu/yTdpnjmHjy4g9nPcoyAfj8a2ovF0PJSIu1fhxSo2EKF5byOBPaSQcyZ2igtcel6FZWFNWB+WCh5Xs4RvIUQ+AWumjkc=</latexit>

研究段階の研究成果<latexit sha1_base64="UfxNXJCLQYmpUqyLXjfKQpgTS9g=">AAACaXichVHLTsJAFD3UF+ID0A3RDZFgXJGhCzWuSNy45CGPBAlp64CV0jZtIUHiD7hyZ9SVJsYYP8ONP+CCTzAsMXHjwktpYpSodzIzZ87cc+fMjGxqqu0w1vMJE5NT0zP+2cDc/MJiMBReKthGy1J4XjE0wyrJks01Ved5R3U0XjItLjVljRflxu5wv9jmlq0a+r7TMXmlKdV1taYqkkNUQZZqNY1XQzGWYG5Ex0HSAzF4kTZC9zjAIQwoaKEJDh0OYQ0SbGplJMFgEldBlziLkOruc5wiQNoWZXHKkIht0FinVdljdVoPa9quWqFTNOoWKaOIsxf2wAbsmT2yV/bxa62uW2PopUOzPNJysxo8i+Te/1U1aXZw9KX607ODGrZdryp5N11meAtlpG+fXAxyO9l4d53dsj75v2E99kQ30Ntvyl2GZ68RoA9I/nzucVAQE8nNhJgRYynR+wo/VrGGDXrvLaSwhzTydO4xznGJK19fCAsRYWWUKvg8zTK+hRD7BIQ9jAc=</latexit>

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Globalregion of interest<latexit sha1_base64="RBbvDr1eV60H5EkJzP33VJ153rI=">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</latexit>

Interior Ambisonics

Exterior Ambisonics(C) 空間フーリエ変換に基づく
マルチスポット再生
特許第6386256号: Multiple scattering<latexit sha1_base64="1cFmGo3MKK93XFDR/bt1WYuDyHA=">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</latexit>

13.44 cm
13.44 cm

Bright zone
Circular loudspeaker array
P (rref , φ, 0, ω) = 1zΦReference circle

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特願2022-007150

社会展開中の研究成果

Quiet
Zone

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英語

16 ch
スピーカ

rref
y

,

r0

x

Dark Zone
P (rref , φ, 0, ω) = 0

日本語

中国語

韓国語

4

研究段階の研究成果(A)内部外部同時制御に基づくマルチ音場制御
学会発表
T. Okamoto, 2D multizone sound eld synthesis withinterior-exterior Ambisonics,” WASPAA 2021
岡本，”音場分離と内部外部同時制御に基づくマルチ音場制御”，

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Rq
Cylindricalba✏e<latexit sha1_base64="4Dyi8hfBeATTsUj8rZHzcqFfm9w=">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</latexit><latexit sha1_base64="eB3ED7x+wvZmfbFTHa6tV28iddE=">AAACbnichVFNSwJRFD1OX2YfWkEEEUliuJKni4pWgpuWfuQHmMjM+LTBcWaYGQWT/kD7aBEUBRHRz2jTH2jhT4g2gUGbFl3HgSip7jDzzj3vnjvn3ScZqmLZjPU8wtj4xOSUd9o3Mzs37w8sLOYtvWXKPCfrqm4WJdHiqqLxnK3YKi8aJhebksoLUiM52C+0uWkpurZvdwxebop1TakpsmgTVUp2SFg1KVUrgRCLMieCoyDmghDcSOmBWxygCh0yWmiCQ4NNWIUIi54SYmAwiCujS5xJSHH2OY7hI22LqjhViMQ26FunrOSyGuWDnpajlukvKr0mKYMIsyd2x/rskd2zZ/bxa6+u02PgpUOrNNRyo+I/Wcm+/6tq0mrj8Ev1p2cbNew4XhXybjjM4BTyUN8+OutndzPh7ia7Zi/k/4r12AOdQGu/yTdpnjmHjy4g9nPcoyAfj8a2ovF0PJSIu1fhxSo2EKF5byOBPaSQcyZ2igtcel6FZWFNWB+WCh5Xs4RvIUQ+AWumjkc=</latexit><latexit sha1_base64="UfxNXJCLQYmpUqyLXjfKQpgTS9g=">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</latexit>

日本音響学会2021年秋季研究発表会

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Globalregion of interest<latexit sha1_base64="jbvLfRNejVRo6h1J2kuPPawKZwc=">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</latexit><latexit sha1_base64="xY4EfUF+ki6JDpxHhufQcYrETgo=">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</latexit><latexit sha1_base64="T1Y7Oc5TScHPEBYoSqQLnV2sDMM=">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</latexit><latexit sha1_base64="RBbvDr1eV60H5EkJzP33VJ153rI=">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</latexit>

Interior Ambisonics

Exterior Ambisonics

本技術に関する知的財産権
発明の名称：音場制御装置，音場制御システム，音場制御方法およびプログラム
出願番号：特願2021-121174
出願人：国立研究開発法人情報通信研究機構
発明者：岡本拓磨
fi5従来技術とその問題点(A)
従来技術(e. g. Y. J. Wu et al., IEEE TASLP 2009)
再生したい複数のローカル音場を定義し，グローバル音場へと変換変換されたグローバル音場を包囲型のスピーカアレイで再現

rq
Zone q<latexit sha1_base64="Liyphcvwbe3UNxWLJDKVZcSPmCE=">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</latexit><latexit sha1_base64="EBLDdoKlDh2mgBn1XuyWobgnKnA=">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</latexit>

Zone 1<latexit sha1_base64="YKINIaXgJWwsO/utUoQRA25nyok=">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</latexit>

問題点
Globalregion of interest<latexit sha1_base64="jbvLfRNejVRo6h1J2kuPPawKZwc=">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</latexit>

無音領域の位置と有音領域の音波の進行方向との位置関係により<latexit sha1_base64="xY4EfUF+ki6JDpxHhufQcYrETgo=">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</latexit>

Zone Q<latexit sha1_base64="BDQcuk095bIzAvIuFbZQR94oCww=">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</latexit>

制御性能が変わってしまう
無音領域と並行な音波は実現が困難→ そもそもグローバル音場への変換時点で物理的に無理がある<latexit sha1_base64="TKC0CwS9Ryw9cQ04Ik6o9kg6PMY=">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</latexit><latexit sha1_base64="FGJeYD0PVK+/vZ1gdU+8q0ntM1w=">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</latexit>(i) Synthesized field(ii) Synthesis error<latexit sha1_base64="Fr9M+rlybELtLw3EG0o8PBKVpE4=">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</latexit><latexit sha1_base64="TKC0CwS9Ryw9cQ04Ik6o9kg6PMY=">AAACenichVHLSgMxFD0dX7W+qiIIbkqLogglLaLFVcGNyz5sFVTKzDS1wenMMJMW2uIP+AMuXFUQ0X6GG3/AhZ8gLhXcdOHtdEBU1BuSnJzcc3OSaLYhXMnYU0AZGh4ZHQuOhyYmp6ZnwrNzRdeqOzov6JZhOQea6nJDmLwghTT4ge1wtaYZfF873env7ze44wrL3JNNmx/X1BNTVISuSqJK4YVVsRbJN01Z5a5o8XKkIrhRLoVjLM68iPwECR/E4EfGCt/gCGVY0FFHDRwmJGEDKlxqh0iAwSbuGG3iHELC2+c4Q4i0dcrilKESe0rjCa0Ofdakdb+m66l1OsWg7pAygmX2yG7ZK3tgXfbMer/Wans1+l6aNGsDLbdLM+eL+fd/VTWaJaqfqj89S1SQ8rwK8m57TP8W+kDfaF285rdzy+0VdsVeyH+HPbF7uoHZeNOvszx3iRB9QOL7c/8ExWQ8sRlPZpOxdMr/iiCWEMUqvfcW0thFBgU6t40O7tAN9JSosqasD1KVgK+Zx5dQNj4A8YeSDA==</latexit>(iii) Sound pressure level<latexit sha1_base64="nz/Mk91QRSCznM2ct64xB0jRzcU=">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</latexit>(a) Conventional method (Li = 64, Le = 0) :<latexit sha1_base64="FGJeYD0PVK+/vZ1gdU+8q0ntM1w=">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</latexit>(i) Synthesized field(ii) Synthesis error<latexit sha1_base64="Fr9M+rlybELtLw3EG0o8PBKVpE4=">AAACf3ichVHLLgRBFD3T3uMxg42w6Zh4bSZ3ZuG1kthYYgwSZNLdChU13Z1+TMJEYu0HLKxIELHgH2z8gIVPEEsSGwt3ejoRBLdSVadO3XPrVJXpKukHRI8JraGxqbmltS3Z3tHZlUp39yz7TuhZomg5yvFWTcMXStqiGMhAiVXXE0bZVGLF3J2t7a9UhOdLx14K9lyxUTa2bbklLSNgqpTuH5VSjukFJ7Q3dVb6fugJXYmKUKV0hrIUhf4T5GKQQRzzTvoS69iEAwshyhCwETBWMOBzW0MOBJe5DVSZ8xjJaF/gAEnWhpwlOMNgdpfHbV6txazN61pNP1JbfIri7rFSxxA90BW90D1d0xO9/1qrGtWoednj2axrhVtKHfUV3v5VlXkOsPOp+tNzgC1MRl4le3cjpnYLq66v7B+/FKYXh6rDdEbP7P+UHumOb2BXXq3zBbF4giR/QO77c/8Ey/lsbjybX8hnZibjr2jFAAYxyu89gRnMYR5FPvcQF7jBrZbQRrSsRvVULRFrevEltKkPjGGTLQ==</latexit>(iii) Sound pressure level<latexit sha1_base64="K3F/+XjaCbr2Ti/11tPnd9/ZCIA=">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</latexit>= ⇡/4(c) Conventional method (Li = 64, Le = 0) :=⇡6

新技術の特徴(A)原理
包囲型アレイの内側に放射型アレイを追加
複数のローカル音場を包囲型アレイ用のグローバル音場とR<latexit sha1_base64="tTaOHeeIUBO/tb8yoU9wi6pdx90=">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</latexit>

Zone 1<latexit sha1_base64="YKINIaXgJWwsO/utUoQRA25nyok=">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</latexit>

Rl<latexit sha1_base64="vKF6xXSpPaEvokoE8FWKYQc+GdY=">AAACcXichVHLSgMxFD0dX7U+WnWjuCktiiCUtIiKq4Ibl9raB7RaZsZoh86LmbRQh/6AP6DgSkFE/Aw3/oCLfoK4rODGhbfTAVFRb0hycnLPzUmi2LrmCsa6IWloeGR0LDwemZicmo7GZmaLrtV0VF5QLd1yyorscl0zeUFoQudl2+Gyoei8pDS2+/ulFndczTL3RdvmB4Z8YmrHmioLog5zNa9qyKLuGJ7e6dRiSZZifsR/gnQAkghi14rdooojWFDRhAEOE4KwDhkutQrSYLCJO4BHnENI8/c5OoiQtklZnDJkYhs0ntCqErAmrfs1XV+t0ik6dYeUcSyxJ3bHeuyR3bNn9v5rLc+v0ffSplkZaLldi57N59/+VRk0C9Q/VX96FjjGpu9VI++2z/RvoQ70rdPzXn4rt+Qts2v2Qv6vWJc90A3M1qt6s8dzl4jQB6S/P/dPUMyk0uupzN5aMpsJviKMRSSwQu+9gSx2sIsCnevgAle4DvWkBSkuJQapUijQzOFLSKsf87GP6w==</latexit>

Zone q<latexit sha1_base64="EBLDdoKlDh2mgBn1XuyWobgnKnA=">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</latexit>

re<latexit sha1_base64="IOKaDbSz36CI9XnqI1Q49P9zGZs=">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</latexit>ri<latexit sha1_base64="YHzWqcuZOxs1ENpMpbK5O77InDU=">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</latexit>

Rl<latexit sha1_base64="vKF6xXSpPaEvokoE8FWKYQc+GdY=">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</latexit>

Rq
Cylindricalba✏e<latexit sha1_base64="4Dyi8hfBeATTsUj8rZHzcqFfm9w=">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</latexit><latexit sha1_base64="eB3ED7x+wvZmfbFTHa6tV28iddE=">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</latexit><latexit sha1_base64="UfxNXJCLQYmpUqyLXjfKQpgTS9g=">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</latexit>

放射型アレイ用のグローバル音場
へと変換
それぞれのグローバル音場をそれぞれのアレイで再生

Zone Q<latexit sha1_base64="BDQcuk095bIzAvIuFbZQR94oCww=">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</latexit>

Rl<latexit sha1_base64="vKF6xXSpPaEvokoE8FWKYQc+GdY=">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</latexit>

Globalregion of interest<latexit sha1_base64="jbvLfRNejVRo6h1J2kuPPawKZwc=">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</latexit><latexit sha1_base64="xY4EfUF+ki6JDpxHhufQcYrETgo=">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</latexit><latexit sha1_base64="T1Y7Oc5TScHPEBYoSqQLnV2sDMM=">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</latexit><latexit sha1_base64="RBbvDr1eV60H5EkJzP33VJ153rI=">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</latexit>

Interior Ambisonics

Exterior Ambisonics

特徴
音波の進行方向へ依存せず分解が可能<latexit sha1_base64="3WguG9HjO1CAOk+GoN0tlJOZ684=">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</latexit>(a) Interior field<latexit sha1_base64="HXg2yLNYr34mNuQPbJzaW4oLleg=">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</latexit>(b) Exterior field<latexit sha1_base64="3hHsM3F/GDGD4ww3p6DUSDYKEBE=">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</latexit>(c) Interior-exterior field7

従来技術との比較(A)64チャネルスピーカアレイを用いた計算機シミュレーション結果
すべての音波の方向に対して提案法が高精度な波面を再現
すべての音波の方向に対して提案法が高い音圧コントラストを実現<latexit sha1_base64="TKC0CwS9Ryw9cQ04Ik6o9kg6PMY=">AAACenichVHLSgMxFD0dX7W+qiIIbkqLogglLaLFVcGNyz5sFVTKzDS1wenMMJMW2uIP+AMuXFUQ0X6GG3/AhZ8gLhXcdOHtdEBU1BuSnJzcc3OSaLYhXMnYU0AZGh4ZHQuOhyYmp6ZnwrNzRdeqOzov6JZhOQea6nJDmLwghTT4ge1wtaYZfF873env7ze44wrL3JNNmx/X1BNTVISuSqJK4YVVsRbJN01Z5a5o8XKkIrhRLoVjLM68iPwECR/E4EfGCt/gCGVY0FFHDRwmJGEDKlxqh0iAwSbuGG3iHELC2+c4Q4i0dcrilKESe0rjCa0Ofdakdb+m66l1OsWg7pAygmX2yG7ZK3tgXfbMer/Wans1+l6aNGsDLbdLM+eL+fd/VTWaJaqfqj89S1SQ8rwK8m57TP8W+kDfaF285rdzy+0VdsVeyH+HPbF7uoHZeNOvszx3iRB9QOL7c/8ExWQ8sRlPZpOxdMr/iiCWEMUqvfcW0thFBgU6t40O7tAN9JSosqasD1KVgK+Zx5dQNj4A8YeSDA==</latexit><latexit sha1_base64="FGJeYD0PVK+/vZ1gdU+8q0ntM1w=">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</latexit>(i) Synthesized field(ii) Synthesis error<latexit sha1_base64="Fr9M+rlybELtLw3EG0o8PBKVpE4=">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</latexit><latexit sha1_base64="TKC0CwS9Ryw9cQ04Ik6o9kg6PMY=">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</latexit>(iii) Sound pressure level<latexit sha1_base64="nz/Mk91QRSCznM2ct64xB0jRzcU=">AAACtnichVHLShxBFD12HprJw9FsAtk0DoYRwlgjgw6CILjJIosZzahgm6G6vc4U9ovumiGmmR/wB1xklYBIyAfkA7LJD2ThIluDuDTgxkVu9zTkIUluUVWnTt1z61SVHboq1kKcjBg3bt66PTp2p3D33v0H48WJyfU46EUOtZzADaJNW8bkKp9aWmmXNsOIpGe7tGHvraT7G32KYhX4L/R+SNue7PhqVzlSM9UuNi1Nr3RSljPmSuD3yU9p6Zoe6W6wYw7Kz9uJ5UndjbxEDQZL87Wn5i8UMSVmzEXTanTVkhWq2Vq7WBIVkYV5HVRzUEIejaB4DAs7COCgBw8EH5qxC4mY2xaqEAiZ20bCXMRIZfuEAQqs7XEWcYZkdo/HDq+2ctbndVozztQOn+Jyj1hpYlp8Ee/FhfgsPogzcfXXWklWI/Wyz7M91FLYHj94tHb5X5XHs0b3p+qfnjV2Uc+8KvYeZkx6C2eo778+vFhbXJ1Onoh34pz9vxUn4hPfwO9/d46atPoGBf6A6p/PfR2sz1Wq85W5Zq20XM+/YgyPMYUyv/cClvEMDbT43I/4ilN8M+rGS4OMzjDVGMk1D/FbGOEPsgqotg==</latexit><latexit sha1_base64="FGJeYD0PVK+/vZ1gdU+8q0ntM1w=">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</latexit>(i) Synthesized field(ii) Synthesis error<latexit sha1_base64="Fr9M+rlybELtLw3EG0o8PBKVpE4=">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</latexit>(iii) Sound pressure level<latexit sha1_base64="K3F/+XjaCbr2Ti/11tPnd9/ZCIA=">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</latexit>(a) Conventional method (Li = 64, Le = 0) := ⇡/4<latexit sha1_base64="Rpq5QGfOQyt7pNgkexchQhKG4js=">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</latexit>(b) Proposed method (Li = 53, Le = 11) :(c) Conventional method (Li = 64, Le = 0) :=⇡<latexit sha1_base64="D4HAIPFlmJcyELSIrbc894hWw7Y=">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</latexit>= ⇡/4(d) Proposed method (Li = 53, Le = 11) :500 Hzの結果=⇡

8

研究段階の研究成果(B)
任意のスピーカ配置に対応したマルチ音場制御
学会発表
岡本，”複数 ッフル型円形アレイを用いた多重拡散を考慮した音場制御”，
日本音響学会2022年春季研究発表会

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本技術に関する知的財産権
発明の名称：音場制御装置，音場制御システム，音場制御方法およびプログラム
出願番号：特願2022-007150
出願人：国立研究開発法人情報通信研究機構
発明者：岡本拓磨
バ

9従来技術とその問題点(B)
従来技術(N. Ueno et al., IEEE TASLP 2019)
重み付きモード制御法により任意のスピーカ配置のマルチ音場制御が可能

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問題点
再生領域内部に多数の円筒バッフル(=柱)がある場合(=多重拡散あり)にも対応したい

10新技術の特徴(B)原理
複数円筒バッフルの多重拡散を考慮したスピーカと制御点間の伝達特性を解析的に導出導出した伝達関数を用いた重み付きモード制御法により各スピーカの再生信号を算出

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Interior Ambisonics

Exterior Ambisonics

バッフルが1つの場合の特殊解

一般解

特性
従来方式および新技術(A)を含む任意のスピーカ配置での一般解として導出

11従来技術との比較(B)(a) Open arrays

Acoustic contrast

Synthesis error(b) Considering self-scattering(c) Proposed

多重拡散を考慮していないモデルよりも高精度
新方式(1)と同様無音領域と並行な音波の再現も可能

Synthesized sound pressure

64チャネルスピーカアレイを用いた計算機シミュレーション結果

単一音場制御における再現誤差

Synthesized sound pressure

Synthesis error(a) Surrounding

単一音場制御 (500 Hz)(b) Distributed

マルチ音場制御 (500 Hz)
12実用化に向けた課題(A)(B)
実環境での性能評価
共に定式化は2次元音場かつ自由音場→ 実環境である3次元音場かつ反射音等を考慮した実環境での性能評価

スピーカチャネル数の削減
共に計算機シミュレーションでは64チャネルのスピーカを使用→ 実装のためにはチャネル数の削減の検討が必要

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Quiet
Zone
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Rl<latexit sha1_base64="vKF6xXSpPaEvokoE8FWKYQc+GdY=">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</latexit><latexit sha1_base64="m/6x1EztdOX/LSrzh+TLcfB2KX4=">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</latexit>

Rq
Cylindricalba✏e<latexit sha1_base64="4Dyi8hfBeATTsUj8rZHzcqFfm9w=">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</latexit><latexit sha1_base64="eB3ED7x+wvZmfbFTHa6tV28iddE=">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</latexit><latexit sha1_base64="UfxNXJCLQYmpUqyLXjfKQpgTS9g=">AAACaXichVHLTsJAFD3UF+ID0A3RDZFgXJGhCzWuSNy45CGPBAlp64CV0jZtIUHiD7hyZ9SVJsYYP8ONP+CCTzAsMXHjwktpYpSodzIzZ87cc+fMjGxqqu0w1vMJE5NT0zP+2cDc/MJiMBReKthGy1J4XjE0wyrJks01Ved5R3U0XjItLjVljRflxu5wv9jmlq0a+r7TMXmlKdV1taYqkkNUQZZqNY1XQzGWYG5Ex0HSAzF4kTZC9zjAIQwoaKEJDh0OYQ0SbGplJMFgEldBlziLkOruc5wiQNoWZXHKkIht0FinVdljdVoPa9quWqFTNOoWKaOIsxf2wAbsmT2yV/bxa62uW2PopUOzPNJysxo8i+Te/1U1aXZw9KX607ODGrZdryp5N11meAtlpG+fXAxyO9l4d53dsj75v2E99kQ30Ntvyl2GZ68RoA9I/nzucVAQE8nNhJgRYynR+wo/VrGGDXrvLaSwhzTydO4xznGJK19fCAsRYWWUKvg8zTK+hRD7BIQ9jAc=</latexit>

Zone Q<latexit sha1_base64="BDQcuk095bIzAvIuFbZQR94oCww=">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</latexit>

Rl<latexit sha1_base64="vKF6xXSpPaEvokoE8FWKYQc+GdY=">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</latexit>

Globalregion of interest<latexit sha1_base64="jbvLfRNejVRo6h1J2kuPPawKZwc=">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</latexit><latexit sha1_base64="xY4EfUF+ki6JDpxHhufQcYrETgo=">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</latexit>: Multiple scattering<latexit sha1_base64="1cFmGo3MKK93XFDR/bt1WYuDyHA=">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</latexit><latexit sha1_base64="T1Y7Oc5TScHPEBYoSqQLnV2sDMM=">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</latexit><latexit sha1_base64="RBbvDr1eV60H5EkJzP33VJ153rI=">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</latexit>

Interior Ambisonics

Exterior Ambisonics

13

社会展開中の研究成果(C)
空間フーリエ変換に基づくマルチスポット再生
主要な学術論文，査読付き国際会議
T. Okamoto and A. Sakaguchi, “Experimental validation of spatial Fouriertransform-based multiple sound zone generation with a linear loudspeakerarray,” J. Acoust. Soc. Am. 2017 (直線スピーカアレイ)
T. Okamoto, “Analytical methods of generating multiple sound zones for open
and ba ed circular loudspeaker arrays,” WASPAA 2015 (円形スピーカアレイ)
本技術に関する知的財産権
発明の名称：局所音響再生装置およびプログラム
登録番号：特許第6386256号
出願人：国立研究開発法人情報通信研究機構
発明者：岡本拓磨
ffl

14

従来技術とその問題点(C)
従来技術(e. g. J. Choi et al., J. Acoust. Soc. Am. 2002)

Dark zone(Quiet area)<latexit sha1_base64="(null)">(null)</latexit>

..
.

..
.

..
.

..
.

<latexit sha1_base64="(null)">(null)</latexit><latexit sha1_base64="(null)">(null)</latexit>

G(!)<latexit sha1_base64="(null)">(null)</latexit>

Bright zone
(Listening area)

Control points

Loudspeaker array

多点制御に基づく方式：各スピーカと制御点間の伝達関数の逆行列演算に基づく

D(!)
Drivingfunction<latexit sha1_base64="Dngi64xhHlPolZlRH2TrdHw43eg=">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</latexit><latexit sha1_base64="(null)">(null)</latexit>

P (!)
Sound
pressures<latexit sha1_base64="kAWfSr3XquhFurDMC2T5uoHzihQ=">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</latexit>

Transferfunction<latexit sha1_base64="(null)">(null)</latexit><latexit sha1_base64="(null)">(null)</latexit>

問題点
各スピーカと制御点間の距離情報しか考慮していない→位置関係を陽に考慮していない
逆行列演算は非常に不安点→正則化が必要

15

新技術の特徴(C)原理
音の聞こえる領域の音圧を1，聞こえない領域の音圧を0→矩形窓として連続的にモデル化
矩形窓の空間フーリエ変換=Sinc関数として解析的に導出可能
直線や円形のスピーカアレイ場合は伝達特性の空間フーリエ変換も解析的に導出可能
Linear sound sourcexWindow function
BrightDarklbxb

P (x, yb ) = 0
Dark
y = ybBright zone
Circular loudspeaker array
P (rref , φ, 0, ω) = 1zΦReference circle

φs

rref
y
r0

shift

y

x

Dark Zone
P (rref , φ, 0, ω) = 0

特性波動方程式から導出される空間フーリエ変換により物理的な位置関係を考慮
再生信号を解析的に導出可能=逆行列演算不要

16従来技術との比較(B)-1
実装した64チャネル直線スピーカアレイを用いた実験結果
1.5

2
1.5

-5

1
-10

0

-15

-0.5

-20

-1

-10

0

-15

-0.5

-20

-1
-25

-1.5

-30

2

y [m]

DS

2.5 [dB]

-10

0.5
0

-15

-0.5

-20

-25

-30

2

y [m]

CM

2.5 [dB]

-2
1.5

1.5

-5

-25

-30

2

y [m]

LS

2.5 [dB]

-5

1
-10

0.5
0

-15

-0.5

-10

0.5
0

-15

-0.5

-20

-1

-1.5

0

2

1

-1

-1.5
-2
1.5

1.5

-5

z = 0 [m]
0

2

1

0.5

x [m]

x [m]

1.5

1

0.5

-2
1.5

2

-5

z = 0 [m]
0

x [m]

2

z = 0 [m]
0

-20

-1
-25

-1.5
-2
1.5

2

y [m]

-25

-1.5
-2
1.5

-30

2.5 [dB]

-30

2

y [m]

SFT (rect.)

2.5 [dB]

SFT (Hann)
DS

CM

LS

SFT (rect.)

SFT (Hann)

40
35Bright to dark ratio [dB]z = 0 [m]0x [m]z = 0 [m]x [m]従来技術を上回る制御性能を実現

30
25
20
15
10
5
0

0

1

2

3

Temporal frequency [kHz]

4

5

17

従来技術との比較(B)-2
32チャネル円形スピーカアレイを用いた計算機シミュレーション結果
従来技術を上回る制御性能を実現

Spatial Nyquist Frequency

25
1.5

z = 0 [m]

1.5

0

1

0.5
-20

0
-0.5

-30

-1
-1

0

1

[dB]

0.5
-20

0

-1.5

20
15
LS method (open)
LS method (baffled)
Beamforming (open)
Beamforming (baffled)
Proposed (open)
Proposed (baffled)

10

-0.5

-30

-1
-40

-10

Y axis [m]

-0.5

-10

Y axis [m]Y axis [m]

-20

0

0

1

-10

-1.5

1.5

0

1

0.5

z = 0 [m]BDR [dB]z = 0 [m]

-30

5

-40

0

-1
-40

-1

0

1

[dB]

-1.5

-1

0

X axis [m]X axis [m]X axis [m]多点制御(LS)

ビームフォーミング

提案法

3000 Hzの結果

1

[dB]

0

1

2

3

4

5

Temporal Frequency [kHz]18産学連携の経歴(C)JST資金
2021年度-2022年度：JST ロ ラムマネー ャー(PM)の育成・活躍推進 ロ ラム採択(実施代表者：NICT疋田啓太)
16チャネル小型円形スピーカアレイを実装
2022年10月-2024年3月：JST A-STEPトライアウト「音声信号に最適なマルチスポット
再生スピーカシステムの開発」獲得(代表：岡本拓磨)
事業化に向けた16チャネル小型円形スピーカアレイの高精度化を実施中

グ

プ

ジ

グ

プ

19

構築したデモシステム(C)-1
直線スピーカアレイを用いた音声マルチスポット再生システム
音の聞こえる
Bright zone
(Listening area)
エリア<latexit sha1_base64="(null)">(null)</latexit>

Dark zone
音の聞こえない(Quiet area)
エリア<latexit sha1_base64="(null)">(null)</latexit>

重ね合わせ

こんにちは

Japanesearea<latexit sha1_base64="(null)">(null)</latexit>

English
area

Hello

<latexit sha1_base64="(null)">(null)</latexit>你好

Chinesearea<latexit sha1_base64="(null)">(null)</latexit>

3.2 m

実用化のためには小型化が必須

20

ポータブルデモシステム(C)16チャネル小型円形スピーカアレイの実装：岡本ら，音講論，2022年9月
できるだけ小さく!! → 直径わずか13.44 cm
16 chアンプ(RME Digiface USB同梱)・ケーブルを含めて出張デモ可能
タブレットでマルチスポット(音場)を回転可能：岡本ら，音講論，2012年9月
13.44 cm

2.5 cm13.44 cm<latexit sha1_base64="PjnHn/kBdngue+nAIaVXwZWL0Ys=">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</latexit>

3.1 cm16 chアンプ21

構築したデモシステム(C)-2
16チャネル小型円形スピーカアレイを用いた4言語音声マルチスポット再生システム
翻訳された各言語の音声がそれぞれ違った場所で聞こえる音声翻訳の新たなUIとして実装
こんにちは
Hello

ニューラル言語識別&
ニューラル音声認識

Hello

ニューラル
機械翻訳

你好
안녕하세요

13.44 cm

多言語
ニューラル
音声合成

英語

マルチスポット
再生フィルタ(a) 16 ch円形スピーカ

日本語
16 ch
スピーカ

,

中国語

韓国語

(b) 4言語デモシステム

岡本のNICTでの本務の研究成果

リアルデモ展示実績
2022年9月16日(金)：日本音響学会秋季研究発表会＠北海道科学大学
2022年10月6日(木)，7(金)：けいはんなR&Dフェア2022＠ATR
2022年10月6日(木)，7(金)：京都スマートシティエキスポ2022＠KICK

22

実用化に向けた課題(C)
音声信号に最適なマルチスポット再生システムの実装
これまでに実装した小型円形アレイは低域の音が出ない→ JST A-STEPトライアウトにて改良版を開発中

音声マルチスポット再生の社会展開
NICTイノベーションイニシアティブ共創デザインプロジェクトにおける音声マルチスポット
再生技術サブプロジェクトにてニーズ調査・社会展開を実施中，実証実験実施予定
技術紹介HP：https://ast-astrec.nict.go.jp/MultipleSoundSpotSynthesis/
技術紹介動画(日本語版)：https://youtu.be/ILrm8KRxK30
技術紹介動画([ニューラル音声合成による]英語版)：https://youtu.be/In8AfVcoTC4

23

技術紹介動画再生(2分48秒)https://youtu.be/ILrm8KRxK30

24

企業への期待(C)
音声マルチスポット再生の社会展開
連携企業およびニーズ募集中
音声翻訳モジュールを含めてライセンス可能

音の聞こえるエリアを制御する次世代のテクノロジー

音声マルチスポット再生技術
音声マルチスポット再生技術とは？
国立研究開発法人情報通信研究機構（NICT）が開発した、音が聞こえる場所と聞こえない場所を自由に作る、音空間制御技術です。

音声マルチスポット再生スピーカ

音波は通常、全方向に広がりますが、本技術では多数のスピーカを用いて不要な音波を打ち消して聞こえなくすることで、特定のエリアにだけ音を届けることができます。
1つのエリアだけではなく、複数のエリアへ違う音声を出し分けることも可能です。

私たちが提案する音声マルチスポット再生技術で可能になること
どこでも実演デモ
スーツケースで持ち運びができるほどの小型化を実現しました。
実際に体験したい方はお気軽にご相談ください。

本技術を応用し、展示会ブースやエンターテインメント施設、自動運転車、危険エリアなど様々な分野において、「新しい音空間」を創ることが可能です。

詳しくは技術紹介HPにてこの技術がもたらす「新しい音空間」を共に創り上げてくださる企業様からのご連絡をお待ちしております。
お気軽に下記までお問い合わせください！
岡本 拓磨（おかもと たくま）sfc_oi@ml.nict.go.jp
NICT ユニバーサルコミュニケーション研究所
先進的音声翻訳研究開発推進センター(ASTREC)
先進的音声技術研究室 主任研究員

Webページ公開中
ぜひアクセスください
https://astastrec.nict.go.jp/Multiple
SoundSpotSynthesis/25

お問い合わせ先26