evertz MultiFrame 7814 Series

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7800/7700 MultiFrame Manual

7814 Series Dual HDTV Up/Down/Cross Converters

Revision 1.1.3 Page - 95

7.19.1.5. Down Mix Type Control

This control enables the user to set the type of audio down mixing that will be performed. The user may

select from LoRo (Left Only and Right Only), LtRt (Left Total and Right Total) Prologic I and LtRt (Left

Total and Right Total) Prologic II OR may choose to perform a Custom down-mix.

LoRo

When set to LoRo, the down-mixer will generate Left Only and Right Only

(LoRo) stereo audio.

LtRt (Prologic I)

When set to LtRt (Prologic I), the down-mixer will generate Left Total and

Right Total (LtRt) Prologic I compatible stereo audio.

LtRt (Prologic II)

When set to LtRt (Prologic II), the down-mixer will generate Left Total and

Right Total (LtRt) Prologic II compatible stereo audio.

Custom

When set to custom, the down-mixer will generate Left and Right channels of

audio using the custom down-mixing equations.

7.19.1.6. Custom Down Mix Type Control Settings

When the Down Mix Type is set to Custom the following equation will be used to generate the down-

mixed audio.

norm

gainLFElfe

RsRsLs

LsC

CLLRL

gainlevLlevL

levlev

÷×

×+°

°×+

×+×

= )}

90/

}90/0

{(

normgainLFE

lfeRsRs

LsLsC

CRLRR gain

levRlevRlev

lev ÷××+

°°×

+°°×

+×+

×= )

}90/0

{}90

/0{(

Where

gainlfe

is controlled by LFE Mixing and LFE Gain,

gain

is controlled by Output Gain and

norm

controlled by Output Scaling Mode and where

levLR

levC

levL

levRLs

and

levRRs

are custom

specified user coefficients. These custom down-mixing coefficients are controlled using the appropriate

slider bars in the Down Mix Type control section as shown below.

levLR