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Old 27th March 2005   #3
vaesion
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can anyone translate this to me?
i wanna apply this in my computer and i dont know if its possible.
He says some mastering engineers use ms to widen a stereo image.
how can i do this in the computer.......
this is what he said

Matrixing Left-Right Stereo to MS

It is possible to take any Left-Right stereo signal, and matrix it into it's M and S components. Why do this? Mastering engineers have used this technique to widen (or narrow) the stereo image of recordings that are too 'mono'. A stereo L-R signal can be narrowed by panning the L and R channels more centrally, but may cause phase cancellation artifacts if the signal is not fully mono compatible. It is impossible to widen the stereo image by using pan pots. Matrixing a L-R stereo signal into it's M and S components allows one to widen the stereo image by increasing the S component in relation to the M component, and also to listen to playbacks using a technique that eliminates the center phantom image problems described previously. One way of matrixing a L-R stereo signal to MS requires a mixing board with a mono output, an augmented speaker array (and a soldering iron to make the necessary cables):

•bring the Left and Right channels of the source material in on two mixer channels,

•pan them hard left and right respectively, and assign them to a pair of output busses (for example, Group outs 1 and 2),

•derive the M component by assigning both of these channels to the mono output bus on the board.

The S component requires a special cable to go from the two Group outs (as above) to a single BALANCED line input:

•connect the + wire of the LEFT/GROUP output (as assigned above) to the TIP (or the + XLR pin) of the balanced line input connector.

•connect the + wire of the RIGHT/GROUP output (as assigned above) to the RING (or the - XLR pin) of the balanced line input connector.

•connect both of the shields to the sleeve (or XLR pin 1) of the input connector.

This new plug is the S component.

These M and S signals can either be brought into other channels of the same mixer and fed to the L-R outputs, matrixed to form L-R again in exactly the same way as described in the 'Matrixing MS to Stereo' portion of this document. The stereo width of the originally L-R source material can now be changed by varying the amount of S component relative to the M component.

If the board you are using does not have a MONO output buss, you can assign the L and R inputs to two odd (or even) numbered Group Outs, and use a Y cable to sum these outputs into one input connector.
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