diff --git a/content/.smart-env/multi/Alan_Blumelein_md.ajson b/content/.smart-env/multi/Alan_Blumelein_md.ajson
new file mode 100644
index 00000000..80de3e56
--- /dev/null
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diff --git a/content/.smart-env/multi/Bell_Laboratory_md.ajson b/content/.smart-env/multi/Bell_Laboratory_md.ajson
new file mode 100644
index 00000000..d2f66ae6
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diff --git a/content/.smart-env/multi/Blumlein_md.ajson b/content/.smart-env/multi/Blumlein_md.ajson
new file mode 100644
index 00000000..ddaf11e5
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+++ b/content/.smart-env/multi/Blumlein_md.ajson
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diff --git a/content/.smart-env/multi/NYPLリサーチメモ20251020_md.ajson b/content/.smart-env/multi/NYPLリサーチメモ20251020_md.ajson
index 0c6e2840..ba1c898c 100644
--- a/content/.smart-env/multi/NYPLリサーチメモ20251020_md.ajson
+++ b/content/.smart-env/multi/NYPLリサーチメモ20251020_md.ajson
@@ -13,3 +13,12 @@
 
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diff --git a/content/Alan Blumelein.md b/content/Alan Blumelein.md
new file mode 100644
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--- /dev/null
+++ b/content/Alan Blumelein.md	
@@ -0,0 +1,4 @@
+---
+date: 2025-10-20 13:06
+---
+#person
diff --git a/content/Bell Laboratory.md b/content/Bell Laboratory.md
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+---
+date: 2025-10-20 13:06
+---
+#stub
diff --git a/content/Blumlein.md b/content/Blumlein.md
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+---
+date: 2025-10-20 13:05
+---
+最も初期のステレオ録音方式で、発明者である[[Bell Laboratory]]の[[Alan Blumelein]]が名前の由来。
+
+双指向性のマイクロフォンを水平方向同じ位置、角度を90度の互い違いに配置して録音する。
+
+同じポイントで全指向性のマイクロフォンを追加するとダブルMS録音をやっていることに等しくなり、前後左右四方向の任意の指向性を後からレンダリングできる。
+
+さらに垂直方向の双指向性マイクを加えれば、1次のアンビソニックBフォーマットを録音していることになる。
diff --git a/content/NYPLリサーチメモ20251020.md b/content/NYPLリサーチメモ20251020.md
index d1c620bc..51f269ae 100644
--- a/content/NYPLリサーチメモ20251020.md
+++ b/content/NYPLリサーチメモ20251020.md
@@ -3,19 +3,19 @@ date: 2025-10-20 12:42
 ---
 #research 
 
-## ベル研究所のクリッピング
+## [[Bell Laboratory|ベル研究所]]のクリッピング
 
 中身がなんだかわからないのでとりあえず予約したやつ。
 
 ### Early Hi-Fi and Stereo Recording at Bell Laboratories(1931-1932)
 
-A.C. Keller, Journal of Audio Engineering Society Vol.29, No ,4 1981 April 274p
+[[Arther C. Keller]], Journal of Audio Engineering Society Vol.29, No ,4 1981 April 274p
 
 あった。無料で読めるね
 
 [E-library page - AES](https://aes2.org/publications/elibrary-page/?id=18963)
 
-### The Bell Labs Story Part 1 - Barry Fox examines the historic experimental work on sound and reproduction performed in the '30s.
+### The Bell Labs Story Part 1 - [[Barry Fox]] examines the historic experimental work on sound and reproduction performed in the '30s.
 
 HI-FI NEWS & RECORD REVIEW vol 27-no.2, 1982, February p21
 
@@ -23,4 +23,10 @@ HI-FI NEWS & RECORD REVIEW vol 27-no.2, 1982, February p21
 
 HI-FI NEWS & RECORD REVIEW 1982 March p53
 
-これはなさそう。
\ No newline at end of file
+## The Bell Labs Story Part 3 - Barry Fox concludes the story
+
+HI-FI NEWS & RECORD REVIEW 1982 April p21
+
+これはなさそう。
+
+[[Arther C. Keller]]という人が1981にAESの記事でベル研の30年代のステレオやハイファイレコーディングの仕組みを振り返っていて、ステレオ録音50年記念ということでBarry Foxという人がそれを追っかけているっぽい。Kellerは[[Blumlein]]録音の[[Alan Blumelein]]の同僚。
\ No newline at end of file