Rane ECS v2 RaneWare (RaneWare 2.1) - Manual (Page 7)

RW Manual-7
Mixer
Mixer
This selects one of six ECM 82 Mixers.
Output button
This toggles the ECM 82’s Mix Out between on (green
indicator, depressed button, audio unmuted) or off (gray
indicator, raised button, audio muted). This is useful to
temporarily turn off all of the Mics on a certain Mixer(s).
Note that the Acoustic Echo Canceller still adapts when the
Mix Out is muted with the
Output button. Thus, use the
Output button rather than the individual Active buttons to
mute all Mics on a Mixer so the Echo Canceller continues to
adapt.
Echo Canceller
Each Mixer may contain an optional Acoustic Echo
Canceller. The Echo Canceller checkboxes control the
operation of the Echo Canceller — only if it is installed.
When all three boxes are unchecked, the Echo Canceller
operates at its normal 7 kHz bandwidth. If no Echo Canceller
is installed, the
Bypass check box must be checked. Also,
check the Bypass box while adjusting the Mic gains during
setup.
Bypass: Checking only this box bypasses the Echo
Canceller. When there is no far-end, or in applications where
no ECA 1 Echo Cancellers are used, check the
Bypass box.
Also, check this box when another device in the system is
being used to perform the acoustic echo cancelling (i.e.,
Tandberg, Picturetel, VTEL…)
Mixer Page
3 kHz: In this mode, the Echo Canceller operates at 3 kHz
bandwidth. Always try leaving 3 kHz unchecked. If the far-
end complains about echo, checking the 3 kHz box can help
reduce the complaints.
Enhanced: This increases the bandwidth to 20 kHz by
bypassing the Echo Canceller when the far-end is not talking.
This is useful for music applications when a high fidelity in
the far-end is required when the far-end is not talking.
Suppression
When a new Mic gates on, the Echo Canceller must re-
adapt. This is the time when acoustic echo is most likely to
occur, since the Echo Canceller must re-learn the acoustics of
the room.
Suppression can be used to avoid the echo that
may occur when new Mics gate on. Suppression is only
added for a few seconds after a new Mic gates on. In this
sense, ECS Mixer Suppression can be thought of as “one-
time” suppression.
When checked, 12 dB of Suppression (attenuation) is
added to the Mix Out – but only when a new Mic gates on.
Typical default value: When using the ECA 1 Acoustic
Echo Canceller inside an ECM 82 Mixer, always check the
Suppression box. When no, or an external acoustic echo
canceller is used, leave this box unchecked.
NOMM Mode
NOMM stands for Number of Open Mics (and Mixers).
Most automatic mic mixers have a NOM operation mode. By
keeping track of the Number of Open Mics, automatic mic
mixers can automatically adjust the gains of the open mics to