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The RB-TGHD is an 8 channel audio tone
generator that provides line identification for
multi-channel audio systems, including 5.1
and 7.1 surround sound typically used in high
definition television broadcasts. By using a
range of widely accepted industry standard
tone sequences such as the EBU R49, GLITS
and BLITS tones, channel identification and
associated levels can be determined easily.
Correct channel configuration in folddown
mixes can also be highlighted when
a broadcaster needs to mix several audio
channels into a stereo feed.
The RB-TGHD caters for 2, 4, 6 and 8 channel
configurations and all of the available
audio tone sequences for each channel
configuration can be cycled through
automatically, or selected manually, and
a loop mode allows patterns of tones to
be repeated. A bank of 4 pushbuttons on
the front panel sets these options and the
associated LEDs indicate the current setting.
A set of 8 LEDs on the front panel indicate
which channel is currently outputting audio
with the LEDs numbered as both 1-8 and as L,
R, C, LFE, LS, RS, LR and RR.
The RB-TGHD is available in two variations,
each providing both analogue and digital
audio outputs. The RB-TGHDX offers balanced AES/EBU digital audio outputs on 3 pin XLR connectors and the RB-TGHDB has
unbalanced digital audio outputs on BNC
connectors. Both types provide 8 balanced
analogue outputs on 3 pin XLR connectors.
A wordclock synchronising input on BNC
connector allows the digital outputs to
be synchronised to an external signal.
Optionally, an RB-SYA or RB-SYD video sync
board can be fitted, to synchronise the unit
to either an analogue or digital sync signal.
A SYNC LED on the front panel indicates
when the unit is synchronised to the
external signal.
The audio level line-up of the RB-TGHD can
be adjusted from 0dBu to +24dBu in 1dBu
steps (ref FSD) to suit different environments
via the front panel mounted DIP switches.
Changing the audio line-up does not affect
the gain relationship between each channel,
ensuring that correct levels through the
target system can be maintained. These
switches also provide settings for digital
sample rate which ranges from 32 kHz to
192 kHz, and digital sample width which is
either 16 bit or 24 bit.
The serial port allows the RB-TGHD to be
connected to a PC running SCi, the Sonifex
Serial Control Interface. This allows full
control of the unit and the ability to
generate a user defined audio tone
sequence. In addition, a remote port on the
rear provides a simple interface to control
the unit and has several outputs to indicate
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