USL JSD-100 Manual - Manual (Page 9)

Page 9
The JSD-100 is “automation friendly.” It features the standard DB25 parallel automation interface, an RS-232
(EIA232) interface, and Ethernet. The Ethernet interface accepts 5 simultaneous TCP connections to allow control
by a digital cinema server and other equipment while simultaneously being monitored over another TCP
connection.
The Graphical User Interface runs on Windows XP®, Windows 7®, and Windows 8® operating systems. It allows for
complete system configuration, monitoring, and firmware updates over USB, Ethernet, or RS-232. The JSD-100
graphical user interface simplifies installation by including sound pressure level measurement and automatic
equalization. System monitoring, control, and firmware update functions are also available on a standard web
browser.
The JSD-100 includes a precision 1/3 octave RTA that uses the filters specifed in ANSI S1.11-1986. The JSD-100 also
does sound pressure measurements using the C-weighted filter specified in ANSI S1.4-1983. The RTA and SPL
meter can be used to equalize an auditorium manually or automatically.
The JSD-100 includes an automatic equalization feature (auto-EQ). Auto-EQ uses user-defined microphone
calibration files and standard or user-defined equalization curves to automatically adjust the graphic equalizer on
each channel.
The JSD-100 is also “diagnostic friendly.” The system logs the last 32,000 events (format changes, level changes,
internal temperature, loss of AES audio, etc.) to internal flash memory. Log data can be reviewed on the GUI or
the web interface. Current operational status, including selected format, fader level, and measured audio output
levels, is available on the GUI and on the web interface. The current status of the system is also available over
SNMP (Simple Network Management Protocol).
A plug-in module expands the standard 8 channel digital input (4 AES pairs) to a 16 channel digital input (8 AES
pairs). Another plug-in module decodes Dolby® Digital
1
on alternate content inputs.
The HI and VI-N outputs are configurable on a per-format basis. Rear panel output modules are available to output
eight or sixteen analog signals (servo balanced outputs that can drive balanced or unbalanced loads), or 32 AES
channels (16 AES pairs). The model number (described below) determines which output module is installed.
4.2
Block Diagrams
The following pages contain simplified block diagrams to assist the user in understanding the structure and
operation of the JSD-100.
Figure 4.2a shows a simplified overall view of the JSD-100 system. Two channel analog inputs are converted to
digital. All two channel inputs (analog and digital) can be routed through the optional DI-84 board to either decode
Dolby Digital encoding or apply an active matrix, each converting the two channel signal to 5.1 channels. There is
also a "simple matrix" in the DSPs that can convert stereo inputs to 5.1. The optional DI-80 allows for a 16 channel
digital input. Without the DI-80, the JSD-100 handles 8 channels of AES/EBU input. All these signals are routed
through various input select switches based on the selected format, then sent to the DSPs.
DSP1 handles the screen channels, while DSP2 handles the surround channels. All screen channels except LFE go
through a graphic equalizer. The LFE channel goes through a parametric equalizer. The LFE channel goes through a
parametric equalizer and a 125Hz low pass filter as specified by SMPTE EG0432-2-2006.Similarly, the surround
channels go through a graphic equalizer. Provision is made to select the source of the surround channels (discrete
channels or synthesized sources). Surround delays (individual delays for each channel pair) are added to the
surround channels. All channels have a synchronization delay to compensate for projector and other system
delays. Sync delays are configurable for each format. Note that the JSD-100 can support multiple LFE and surround
outputs. Because of this, the LFE parametric equalizer is actually located in the crossover section of the DSP and
1 Manufactured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of Dolby Laboratories.