Attero Tech Box 4 I/OP - Manual (Page 6)

VoiceBox 4 I/OP
User Manual
 Attero Tech LLC 2010 Page 2 614-00008-02
1.3 – System Signal Flow
CobraNet Processor
+
Audio DSP
ADC
Mic
Preamp
Mic/Line Input
CH1
CobraNet Port RS232 Port
RJ45 Conn 3-pin Serial Conn
Selectable Gain
0dB, +30dB, +50dB
+12V Phantom
Power
DAC
Balanced Line
Output CH1
ADC
Mic
Preamp
Mic/Line Input
CH2
Selectable Gain
0dB, +30dB, +50dB
+12V Phantom
Power
DAC
Balanced Line
Output CH2
ADC
Mic
Preamp
Mic/Line Input
CH2
Selectable Gain
0dB, +30dB, +50dB
+12V Phantom
Power
DAC
Balanced Line
Output CH3
ADC
Mic
Preamp
Mic/Line Input
CH4
Selectable Gain
0dB, +30dB, +50dB
+12V Phantom
Power
DAC
Balanced Line
Output CH4
Figure 1 - Signal Flow within the VoiceBox 4 I/OP
System signal flow is shown in Figure 1. All four input channels utilize discrete preamplifier circuitry for optimum signal to
noise ratio with low distortion. Each preamplifier is equipped with 3 selectable analog gain settings, 0 dB for line level
sources, +30 dB for condenser microphones, and +50 dB for dynamic microphones. Each channel also has selectable +12 V
phantom power for powering most electret or small diaphragm condenser microphones.
After the mic/line preamp stage, the analog signal is converted using a high quality 24-bit/48 kHz A-D converter. After
conversion, the digital signal is then sent to the CobraNet processor and DSP. The DSP applies independent and adjustable
equalization (low cut, low shelf, mid sweep, high shelf, and high cut filters), compression, and gain to each input channel.
A fully configurable thirteen input, twelve output matrix mixer allows the processed input channels to be sent out to the
CobraNet network and/or routed back to the local outputs. The matrix mixer also provides the ability to route audio
received from the CobraNet network to the local outputs and/or be looped back to the CobraNet outputs. A further input
into the matrix mixer is provided from a configurable sine wave generator for testing and diagnostic purposes.
Each of the four local output channels also features five bands of fully adjustable parametric EQ, a high pass filter, a fully
adjustable limiter, additional gain/attenuation and a delay element with up to 20ms of delay. The digital audio is then sent
to a high quality D-A converter. The analog signal is then converted to a balanced line level output and sent to the local
audio output connectors.