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7800 MultiFrame Manual
7812DCDA2Q-HD (-AA, –AES4) Dual Path HDTV Down-converter
7.11.6.
Setting the 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
LtRt (Prologic I)
LtRt (Prologic II)
Custom
7.11.7.
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.
L = (LR_lev * L + C_lev * C + Ls_lev_L * Ls{0°/90°} + Rs_lev_L * Rs{0°/90°} + lfe_gain * LFE) * gain / norm
R = (LR_lev * R + C_lev * C + Ls_lev_R * Ls{0°/90°} + Rs_lev_R * Rs{0°/90°} + lfe_gain * LFE) * gain / norm
Where lfe_gain is controlled by LFE Mixing and LFE Gain, gain is controlled by Output Gain and norm is
controlled by Output Scaling Mode and where LR_lev, C_lev, Ls_lev_L, Rs_lev_L, Ls_lev_R and
Rs_lev_R 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.
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When set to LoRo, the down-mixer will generate Left Only and Right Only
(LoRo) stereo audio.
When set to LtRt (Prologic I), the down-mixer will generate Left Total and Right
Total (LtRt) Prologic I compatible stereo audio.
When set to LtRt (Prologic II), the down-mixer will generate Left Total and
Right Total (LtRt) Prologic II compatible stereo audio.
When set to custom, the down-mixer will generate Left and Right channels of
audio using the custom down-mixing equations.
Figure 7-46: Down Mix Type Control
Revision 1.0
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