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Decode
Option
Description
L_R
The two channel source drives just the left and right speakers.
L_C_R
The left and right channels of the source drive the left and right speakers. The
center speaker is driven with 0.707 times the sum of the left and right
channels. The LFE channel is driven with the center channel with the SMPTE
EG 432-‐2-‐2006 125 HZ low pass filter.
Simple
Matrix
The front speakers are driven with the same signals as L_C_R, described
above. The surround speakers are driven with 0.707 times the difference
between left and right (0.707(L-‐R)).
Active Matrix This option is only available if a DI-‐84 board is installed in the JSD-‐60. If the
input is digital and encoded with Dolby Digital® or DTS®, the signal is decoded
to 5.1. If the signal is two-‐channel analog or PCM (not encoded with Dolby
Digital®), the signal is decoded to 5.1 using an active matrix.
HI/VI-‐N Source
The HI output can be driven by a discrete input (such as AES/EBU channel 7) , LR, LCR, or a
custom mix (see Channel Mixer in the Advanced tab). Most auditoriums are wired to put HI on
AES channel 7 since that is where the HI track is located in an Interop DCP. VI-‐N is typically
placed on AES/EBU 8. Note that VI-‐N is only available on the 8 channel digital format in 5.1
auditoriums, since it is delivered on AES/EBU channel 8. HI can be derived from an LCR mix or
delivered by AES/EBU channel 7. Since not all content (especially trailers) has HI on AES/EBU
channel 7 and that channel is used for main sound in 7.1 auditoriums, the use of an LCR mix is
suggested. The default settings load the mixer coefficients in this manner.
8.10.10
SOFTWARE UPDATE TAB
The firmware in the main board, front panel, and digital signal processor in the JSD-‐60 can be
updated through the GUI, over Ethernet or USB. The current firmware versions running can be
viewed in the Summary tab in the Component Information group and on the right side in the
Software Update tab. The left side of the software update tab contains the controls for
firmware updating.