Redbox RB-PD2 User Handbook
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SY
NCHR
ONISERS, DEL
A
Y
S & SILENCE DE
TEC
TORS - RB
-PD2
SYNCHRONISERS, DELAYS &
SILENCE DETECTORS
8
RB-PD2 Stereo Profanity Delay
Introduction
Fig 8-1: RB-PD2 Front Panel
The RB-PD2 is a stereo audio profanity delay used for live broadcast programs to prevent
unwanted or obscene material from being transmitted. It features an automatic audio
stretch algorithm that allows between 2 and 55 (*) seconds of delay to be built up live
whilst “on air”, whilst maintaining the correct pitch. Higher delay durations are available
at lower sample rates and the speed at which the algorithm builds and exits the delay is
also adjustable. The delay can also be acquired whilst playing a pre-selected audio file on a
Compact Flash™ memory card. When the program is complete, the audio stretch algorithm
seamlessly reduces the delay to zero.
The RB-PD2 has both balanced analogue and AES/EBU digital audio inputs and outputs
on 3 pin XLR connectors and provides sample rates up to 48kHz at 24 bit. It can act as a
combined A/D and D/A unit meaning that analogue inputs can be output as AES/EBU or
vice-versa.
The delay can be initiated by pressing the BUILD DELAY button on the front panel. A front
panel display shows the delay amount being built-up, up to the amount initially selected.
There are several ways to make sure that any unwanted material is removed from the audio
at the outputs. A COUGH function, activated from a dedicated front panel button, allows
locally generated sounds being presented at the inputs, such as the presenter coughing or
equipment switching noises, to be discarded.
The DUMP function, which is also activated from a front panel button, has 2 different
modes. The first DUMP mode removes a section of audio that has already been buffered,
by a pre-selected amount. The second DUMP mode plays a pre-selected audio file on the
Compact Flash™ memory card. When the file has finished playing, the delay is then equal to
the duration of the file. The DUMP button can be used multiple times to use up the built-up
delay and once used, the unit automatically starts to rebuild the original delay time. As a last
resort, all the buffered audio can be discarded by pressing and holding the DUMP button
which activates the DROP function.
At the end of a radio show when you want to broadcast live, the delay can be ramped down
by pressing the front panel EXIT DELAY button.
A dedicated record mode allows audio presented at either the analogue or digital inputs to
be recorded to a linear WAV file on a Compact Flash™ memory card. Additionally, the card
format used is PC readable, allowing pre-recorded linear WAV files to be transferred easily
from a PC or other such device.
(* at 32kHz 16bit)