Rane ECM 64 - Manual (Page 10)

Manual-10
ECM 64 Input and Output Controls
Inputs
Each Input has programmable Trim and Mute controls. The
Input Trim operates from –15 to +16 dB in 1 dB steps. The
Input is calibrated so if it is set to 0 dB, a 0 dBu input gives a 0
dB Meter level. For a –10 dBu input, set the Input
Trim to +10
dB.
Outputs
Each Output has a programmable six-channel matrix
mixer, a programmable Output Trim, a Mute button and a
Limiter checkbox. Unlike other systems that only have
crosspoint trims or crosspoint routing controls (like the ECB
62 and SRM 66), each Output on the ECM 64 has both
crosspoint trims and routing controls for ease and flexibility.
Each Crosspoint Trim has a range from –15 to +16 dB in 1
dB steps and an On/Off button for routing. The Output Trim
operates from –114 to +4 dB in 1 dB steps and is calibrated to
represent the actual level. Setting the Output
Trim to 0 dB,
with a 0 dB Meter level, produces a 0 dBu Output Level; and
setting the
Trim to 4 dB produces a +4 dBu Output Level.
The Limiter tracks the Output Trim level and engages at 5
dB above the set level. The Limiter attack rate is 10 millisec-
ond using 1 dB steps. The Limiter release rate is 50 millisec-
ond using 1 dB steps.
Acoustic Echo Canceller
The ECA 1 is an optional continually adaptive Acoustic
Echo Canceller (AEC) module. This module is required when
the ECM 64 is used for audio teleconferencing. The ECA 1 is
included in the ECM 64AD, along with the DH 1. The AEC
performs full-duplex audio teleconferencing by subtracting the
room loudspeaker audio from audio received by the room
microphones. This is accomplished by routing the room
loudspeaker audio to the AEC Reference (REF.) and room
microphones to the AEC IN.
The ECM 64 allows selection of different audio inputs and
reference audio feeds to create a flexible system design. The
AEC Input selects Mic Mix, Line In and Aux In, in any
combination. Most applications will require Mic Mix at a
minimum. The AEC Reference selects between Internal Mix
(consisting of Line In, Aux In and Hybrid In), Out 1 and EXT.
IN. Note: do not use Out 1 for AEC Reference if Near-End
Mics are routed to Out 1 for speech reinforcement.
Since the ECA 1 automatically adapts to the room, training
is not required.
The status of the ECA 1 can be checked in Device >
Peripheral Status. If operating properly, the Acoustic Echo
Canceller’s Rev Level is displayed. Otherwise, Peripheral
Status displays Not Installed.
AEC Page