ASB Audio Switching Boards
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Enova Digital Media Switchers - Hardware Reference Manual
System Examples
The examples below show typical uses for the audio replacement and routing functions of the Audio Switching Board.
Directions for wiring the terminal block connectors are on page 169 and for cabling the HSSI SMA connector are on
page 171. Enova DGX systems with Audio Switching Boards are designed to route audio through the system in three ways:
Embedded Audio
– An audio signal from an Audio Switching Input Board can be embedded on a video signal
and then routed to any or all of the standard video output boards.
Audio Only
– An audio-only signal from an ASB Input Board can be routed to any or all of the ASB Output Boards.
All Audio
– All audio signals (embedded or audio-only) are available to route to any or all destinations.
Embedded Audio - Replacing Embedded Audio on Video Signals
The Audio Switching Boards replace embedded audio on a standard video board (HDMI shown) with an audio-only
signal from an auxiliary audio source. The HDMI video signal is routed to a destination with the original video signal and
the replaced embedded audio signal (FIG. 75). This behavior is enabled by default.
Audio Only - Audio Only from Source to Destination Device
The Audio Switching Input Board can route from connected sources directly to the Audio Switching Output Board and
from there to connected audio destination devices(FIG. 75.
Audio Switching Boards - Outputs
Audio Adjustments per Output (Embedded and Auxiliary Outputs)
Audio Output Compression
• 10-band parametric EQ with variable center frequency, filter type and Q per band
• Center Frequency: 20 Hz to 20 kHz
• EQ Gain: -12 to +12 dB
• Q: 0.1 to 20
• Filter Types: Bell, Bass Shelving, Treble Shelving, Low Pass, High Pass, Band Pass, Band Stop
Audio Output Sync Delay
0 to 200 ms
Balance Control
Balance level can be set from -20 to +20, left to right (default value is 0)
Audio Control per Output
Independent EQ, Volume, and balance control per output
Test Tone Generator
Single selection of test tone type available on all outputs simultaneously. Individually enabled/disabled
per output – 60 Hz, 250 Hz, 400 Hz, 1 kHz, 3 kHz, 5 kHz, 10 kHz, Pink Noise, White Noise
Auxiliary Analog Audio Outputs
Output Level (Maximum)
+17 dBu
Output Impedance
200 Ohms (line level)
Audio Frequency Response
Line: 20 Hz to 20 kHz +/-0.1 dB
Audio S/N Ratio
Line: 105 dB @ 10 dBV, AES17
Audio THD+N
Line: 0.003% @ 0 dBV, 1 kHz
FIG. 75
Audio on the HDMI input signal replaced with auxiliary audio and routed to destination device
FIG. 76
Audio input signal routed to audio destination device
Source Device
Aux Audio System
Destination Device
(video and audio)
HDMI - auxiliary audio replaces embedded audio
HDMI with embedded audio
Signal through system
Audio-only signal
Source Device
Audio-only signal
Signal through system
Audio Destination
Device
Audio-only signal