Editing Matrix decoder (section)

=== Forward-Oriented encoder ===
{| class="wikitable"
|-
! Matrix !! Left Front !! Right Front !! Left Back !! Right Back
|-
! Left Total 
| 1.0 || 0.0 || 0.7 || k0.7
|-
! Right Total 
| 0.0 || 1.0 || k0.7 || 0.7
|}
''<math>j = +90^\circ</math> phase-shift, <math>k = -90^\circ</math> phase-shift''

The Forward-Oriented encoder caused Center Back to be encoded as Center Front and was recommended for live broadcast use for maximum mono compatibility - it also encoded Center Left/Center Right and both diagonal splits in the optimal manner.
Could be used to modify existing 2-channel stereo recordings and create 'synthesized SQ' that when played through a Full-Logic or Tate DES SQ decoder, exhibited a 180° or 270° synthesized quad effect. Many stereo FM radio stations broadcasting SQ in the 1970s used their Forward-Oriented SQ encoder for this. For SQ ''decoders'', CBS designed a circuit that produced the 270° enhancement using the 90° phase shifters in the decoder. [[Sansui Electric|Sansui]]'s QS Encoders and QS Vario-Matrix Decoders had a similar capability.