Editing Matrix decoder (section)

==Electro-Voice Stereo-4 matrix (2:2:4) / (4:2:4) ==
{{Main|Stereo-4}}
The Stereo-4 matrix was invented by [[Leonard Feldman]] and Jon Fixler, introduced in 1970, and sold by [[Electro-Voice]] and [[Radio Shack]]. This matrix was used to encode 4 sound channels on many record albums (4:2:4).<ref>{{cite book|last1=Feldman|first1=Leonard|title=Four Channel Sound|date=1973|publisher=Howard W. Sams & C. Inc.|location=Indianapolis IN|isbn=0-672-20966-7|pages=44–49|edition=1}}</ref>

===Encoding matrix===
{| class="wikitable" style="text-align:center"
|-
! Matrix!! Left Front !! Right Front !! Left Back !! Right Back
|-
! Left Total
| 1.0 || 0.3 || 1.0 || -0.5
|-
! Right Total
| 0.3 || 1.0 || -0.5 || 1.0
|}

===Decoding matrix===
{| class="wikitable" style="text-align:center"
|-
! Matrix<ref name="4channelsound.com"/>!! Left Front !! Right Front !! Left Back !! Right Back
|-
! Left Total
| 1.0 || 0.2 || 1.0 || -0.8
|-
! Right Total
| 0.2 || 1.0 || -0.8 || 1.0
|}