Lectrosonics D4 System User Manual Page 4

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D4T/D4R
LECTROSONICS, INC.
4
General Technical Description
D4T Transmitter
The transmitter can accept up to four inputs from digi-
tal or analog sources. The inputs can be configured as
follows:
• Fouranaloginputsusingallfourjacks
• Twodigitalinputsusingjack1andtwobalanced
analoginputsusingjacks3and4
• Fourdigitalchannelsusingjacks1and2
TheinputconnectorsareTA3“miniXLR”typeswith
thesamepinnumberingasstandardXLRconnectors
for AES/EBU and balanced line level analog signals.
Input preamp circuits use a special balanced amplifier
withveryhighcommonmoderejectiontominimize
hum and noise.
Either analog or AES/EBU digital input signals are
converted to an internal 24-bit digital format which is
then encoded, organized into packets, and passed to
an RF modulator using spread spectrum techniques
and error correction for robust reception. The modu-
lated RF signal is filtered before and after amplification
to suppress out-of-band noise and spurious signals,
and a circulator/isolator guards against intermodulation
interference (IM).
A USB port is provided for firmware updates.
POWER
AMP
OSC
900 MHz
RF
MOD
DIGITAL
BASEBAND
ENCODER
24-bit D/A
(analog)
AES/EBU
OUT
(digital)
24-bit D/A
(analog)
AES/EBU
OUT
(digital)
24-bit D/A
(analog)
24-bit D/A
(analog)
TA3M
INPUTS
CIRCULATOR
ISOLATOR
FILTER
1
2
3
4
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