Attero Tech Box 4 I/OP - Manual (Page 7)

VoiceBox 4 I/OP
User Manual
 Attero Tech LLC 2010 Page 3 614-00008-02
1.4 – Signal Processing
All signal processing after the analog preamplifier circuitry is implemented in the digital domain using powerful 32-bit DSP
hardware and high quality algorithms. All signal processing parameters mentioned are configurable using the Attero Tech
Control Center software.
Figure 2 - DSP Architecture
Input EQ
The EQ stage consists of five cascaded filters: A single pole low cut filter, a 2-pole high cut filter, a low frequency shelf filter,
a mid sweep filter, and a high frequency shelf filter. The low and high cut filters both have adjustable frequencies and have
a bypass option. The low frequency shelf filter is set at 400 Hz and has adjustable gain. The high frequency shelving filter
is set at 3 kHz and also has adjustable gain. The midspan equalizer has adjustable center frequency and gain. Gain for
each filter is adjustable from +12 dB to -12 dB.
Compressor
The compressor stage provides full control over the compression ratio, threshold, attack, and release times. A gain
reduction meter is shown also that shows the amount of compression taking place. The compressor function has a bypass
option.
Input Gain
The input gain stage provides an adjustable range from +12 dB gain to -100 dB of attenuation in 1 dB steps.
Matrix mixer
The matrix mixer provides 12 inputs (4 local, 8 CobraNet) and 12 outputs (4 local, 8 CobraNet). There is also an additional
input from an internal sine wave generator. Any mix of local inputs, network inputs and sine wave generator input can be
directed to any of the local or network outputs.
Output EQ
The output EQ stage consists of five cascaded parametric filters and a high pass filter. Each parametric filter has adjustable
gain, bandwidth and frequency and the 2-pole high pass filter has adjustable frequency. Gain for each parametric filter is
adjustable from +12 dB to -12 dB.
Output Limiter
The output limiter provides limiting for each output channel independently. Limiter ratio is fixed at 100:1. Threshold,
attack, and release time parameters are configurable. A gain reduction meter shows the amount of limiting taking place.
The limiter function may be bypassed.
Output Gain
The gain stage provides a range from +12 dB gain to -100 dB of attenuation. Gain settings are adjustable in 1 dB steps.
Output Delay
Each output has its own delay control with up to 20ms of delay available.
Metering
Metering is available from several points in the audio path: Raw local input, Modified local input, Local output. CobraNet
input and CobraNet output.