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Introduction 1
Introduction
The CM-TB8 Talkback Control Unit is a powerful and highly
flexible self contained communications unit allowing multiple
4-wire and IFB connections within a single 1U rack space.
Using the latest DSP technology, the CM-TB8 integrates a high
quality, digitally controlled audio system with an intuitive
and configurable user interface. It offers easy connection to
any industry standard talkback system including the Sonifex
CM-TBU line listen unit plus the CM-CU1 and CM-CU21
commentator units.
The CM-TB8 provides 8 channels of 4-wire communication,
with 2 additional IFB inputs that can be routed to each
channel. The unit has individual connections for a microphone
and headset, and the gain for each input can be independently
set. Phantom power and a wide gain range ensure support for
most microphone types. All of the audio processing is done
in the digital domain. This gives greater control of the audio
mixing and routing functions and allows smoother changes in
signal level. Likewise, the volume potentiometers on the front
panel control gain digitally, ensuring noise free operation.
Fig 1-1: System Block Diagram
