Editing Matrix decoder (section)

==Hafler circuit (2:2:4) ==
{{Main|Hafler circuit}}
The earliest and simpler form of decoding is the [[Hafler circuit]], deriving back channels out of normal stereo recording (2:2:4). It was used for decoding only (encoding sound was not considered).

===Decoding matrix===
{| class="wikitable" style="text-align:center"
! Decoding matrix!! Left Front !! Right Front !! Left Back !! Right Back
|-
! Left Total
| 1.0 || 0.0 || 1.0 || -1.0
|-
! Right  Total
| 0.0 || 1.0 || -1.0 || 1.0
|}