Vaddio EasyTalk Solutions Manual - Manual (Page 31)

EasyTalk USB Tools
Vaddio EasyTalk USB Solution - Document Number 342-0449 Rev B Page 31 of 48
Advanced Audio Processing Functions
 Speaker EQ Filter (Switch 4): A specialized loudspeaker equalization filter is included within the EasyUSB
Mixer/Amp and is applied to both speaker outputs when enabled. The EQ filter is designed to emulate a
spatial image into the room for voice band signals based upon a mono source. The EQ filter can enhance
speech intelligibility into the room particularly when used with band-limited loudspeakers. The filter increases
low end response while emphasizing voice bands to create a bright natural sound into the room.
 Compressor & ALC (Switch 5): Switch position 5 enables a dual purpose audio processing function for the
speaker outputs. It incorporates an automatic level control (ALC) in conjunction with a compressor/limiter.
The ALC will automatically add gain to low level signals to produce a constant level output to the
loudspeakers. In addition it will compress high level signals to prevent clipping the speaker outputs. The
result is a constant playback level into the room independent of the far-end audio source during the
conference call.
 Audio Delay (Switch 6): An audio delay block of 25 milliseconds can be enabled with this switch. The
audio delay block is intended to improve lip sync issues that can be created by LCD display’s video
processing delay. Some LCD displays can have internal video processing delay associated with the video
input originating from the PC used in the conference. The audio delay will add an additional 25 milliseconds
before audio sample is played out the speaker output channels.
 AEC Disable (Switch 7): The acoustical echo cancellation disable (Up position) will disable echo
cancellation on all EasyMic devices connected to the EasyUSB Mixer/Amp. This function is intended for
troubleshooting or special applications. Special applications may include local recording of room audio in
non-conferencing applications and other stuff like that too.
Interfacing with WEBBi - Web Controller
The EasyUSB Mixer/Amp is designed to work with the WEBBi
Web Controller by connecting the RS-232 on the EasyUSB
Mixer/AMP and the Audio Control port on the WEBBi (see
diagram). A standard CAT-5 cable with RJ-45 connectors is
used to make the connection between the devices. The
connection establishes an RS-232 control session running at
38.4K baud and allows the Volume and Mute controls to be
activated from the Browser based Room User Interface page
served up by the WEBBi.
Interfacing with the HD-USB Camera for Control
The EasyUSB Mixer/Amp also has the ability to send presets to the ClearVIEW HD-USB
Camera. An RS-232 communication session can be established by setting dip Switch 1
to the Enable position. This places the EasyUSB Mixer/Amp as Data Communication
Equipment (DCE) eliminating the need for a null modem cable to the ClearVIEW HD-USB
Camera. This switch also changes the baud rate to 9600 allowing direct communications
with the camera. A standard CAT-5 cable is used between the two devices. Once
connected, a camera preset is run when the user presses the One-Touch Camera Preset
button on the EasyMic MicPOD. The camera preset commands are directly mapped to
the EasyMic ports.
One-Touch Camera Preset Mapping
EasyMic Port Camera Preset Executed
Port 1 Executes Preset 1
Port 2 Executes Preset 2