Everything about Matrix Sound Recording totally explained
Matrix decoder is an audio technology where a finite number of discrete audio channels (eg. 2) are decoded into a larger number of channels on play back (eg. 5). The channels are generally, but not always, arranged for decoding by an
encoder, and decoded for playback by a
decoder.
The notation for matrix encoding consists of the number of discrete audio channels separated by a colon from the number of decoded channels. For example, two discrete channels decoded to four-channels would be notated:
2:4
Five discrete channels decoded to six channels would be notated:
5:6
Many matrix encoders take advantage of the
Haas effect, as well as audio cues inherent in the source channels.
The various encoding matrixes are described below.
SQ Matrix (2:4, "Surround Quadraphonic", "Stereo Quadraphonic", CBS SQ)
| Encoding Matrix |
Left Front |
Right Front |
Left Back |
Right Back |
| Left Total | 1.0 |
0.0 |
j0.7 |
k0.7
|
| Right Total | 0.0 |
1.0 |
k0.7 |
j0.7
|
j = + 90º phase-shift, k = - 90º phase-shift
QS Matrix (2:4, "Quadraphonic Stereo", QS)
| Encoding Matrix |
Left Front |
Right Front |
Left Back |
Right Back |
| Left Total | 0.92 |
0.38 |
j0.92 |
j0.38
|
| Right Total | 0.38 |
0.92 |
k0.38 |
k0.92
|
j = + 90º phase-shift, k = - 90º phase-shift
Ambisonics UHJ coding matrix (2:3)
| Encoding Matrix |
W (pressure signal) |
X (front-back information) |
Y (left-right information) |
| Left Total | 0.470 + k0.171 |
0.093 + j0.255 |
+0.328
|
| Right Total | 0.470 + j0.171 |
0.093 + k0.255 |
-0.328
|
j = + 90º phase-shift, k = - 90º phase-shift
Dolby Surround Surround Matrix (2:4)
| Encoding Matrix |
Left |
Right |
Center |
Surround |
| Left Total | 1.000 |
0.000 |
0.707 |
j0.707
|
| Right Total | 0.000 |
1.000 |
0.707 |
k0.707
|
j = + 90º phase-shift, k = - 90º phase-shift
Dolby Pro Logic Matrix (2:4)
The encoding matix is the same as for Dolby Surround; only the Pro Logic decoder differs.
| Encoding Matrix |
Left |
Right |
Center |
Surround |
| Left Total | 1.000 |
0.000 |
0.707 |
j0.707
|
| Right Total | 0.000 |
1.000 |
0.707 |
k0.707
|
j = + 90º phase-shift, k = - 90º phase-shift
Dolby Pro Logic II Matrix (2:5)
| Encoding Matrix |
Left |
Right |
Center |
Rear Left |
Rear Right |
| Left Total | 1.000 |
0.000 |
0.707 |
j0.8165 |
j0.5774
|
| Right Total | 0.000 |
1.000 |
0.707 |
k0.5774 |
k0.8165
|
j = + 90º phase-shift, k = - 90º phase-shiftFurther Information
Get more info on 'Matrix Sound Recording'.
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