Rane ECS RaneWare User Manual download pdf (Page 12)

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Prog Sig Release

One can think of this parameter as either the longest

distance or delay time between a speaker and a Mic in the

room, or think of Program Signal Release as the room

reverb time (sort of) — although, extremely few conference

rooms are statistically reverberant spaces.

Since you don’t want Mics to Gate On due to loudspeaker

audio, the Program Signal Release time is adjustable to

allow the loudspeaker audio to decay in the room before ECS

releases the Program Status indicator. A larger room may

require a greater Program Signal Release time.

Typical default value: 0.35 seconds or more.

Near Sig Offset

This helps prevent a single talker from Gating mulitple

Mics. It also helps determine which Port has the current audio

source.

The first Mic that Gates On (audio detected above the Mic

Threshold) illuminates the Mic Signal indicator. This causes

the Near Signal Offset value to be added to all other Mics’

Threshold Levels.

For example, when the chairman talks, his Mic Gates On

causing a Mic status signal. Immediately, the Threshold Level

of all Mics except the chairman Mic is adjusted by the Near

Signal Offset. Let’s use a Near Signal Offset of 20 dB.

Thus, if the other Mics are set to a Threshold Level of

-25 dB, when the chairman talks, all other Mics’ Threshold

Levels are forced to -5 dB (-25 plus 20). This helps prevent

Mics that are near the chairman’s Mic from Gating On. This

improves the signal-to-noise and improves Echo Canceller

performance.

Independently, if any Port Signal is detected, the Near

Signal Offset is also added to the Threshold Level of all

other Ports. This is solely for accurate status indication where

one wants to know which Port contains audio — i.e., for

multipoint videoconferencing.

Typical default value: 18 dB or more.

Prog Sig Offset

This is the big cheese of ECS. When Program (Port 1

Output) audio is detected, the Program Signal indicator lights.

Immediately, the Program Signal Offset is added to all Mic

Threshold Levels so the loudspeakers don’t Gate Mics On.

If Mics Gate On due to audio from the loud speakers, the

Echo Canceller will have difficulties in its adaptation and

may return echo, so this is important.

For example, with a Program Signal Offset of 20 dB —

when the far-end talks (via a video codec), Program audio

will be present in the room loudspeakers. If the Mics are set

to a Threshold Level of -25 dB, when the far-end talks, all

Mic Threshold Levels are forced to -5 dB (-25 plus 20).

To verify if Mics are inadvertently Gating On due to

playing an audio source, watch the Mic Signal and Program

Signal Status indicators in RaneWare or look at the ECB 62e

front panel MCS (MiC Signal) and PGS (ProGram Signal)

Status LEDs. Neither Mic Signal indicators should be on

when no one talks at a mic.

During setup, if you find Program Signal Offset must be

set above 24 dB (i.e., 25 or 28…) to avoid Mics Gating On

when no one talks at a Mic and an audio source is playing into

the room, one of three things should be investigated:

1. The first thing to verify is the power amplifier level. You

may need to reduce its level.

2. Check the Mic and loudspeaker placement. Verify that the

Mics are not placed too close to loudspeakers, and that the

Mics are not pointing toward loudspeakers.

3. Verify that Mic Levels and Mic Thresholds are set prop-

erly. Improper settings will cause Mic Gating problems.

See also: Prog Sig Thresh and P3 Prog Contribute.

Typical default value: 18 to 22 dB

Noise Source

When checked, inserts a pink Noise Source at any ECB

62e right channel Output that is on. This is useful during

system setup to set Mic gains and maximum SPL for line-

level audio sources (CD, DVD, hybrid, codec, 8-track tape, 78

records...).

The Noise Source can also be useful during side bar

conferences when you want to mask conversations with a

little bit of noise.

It is also helpful to send this pink noise to the far-end so

they can properly adjust their receive levels for unity gain.

Isn’t unification beautiful?

Typical default value: Off (unchecked)

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Rane ECS RaneWare User Manual Page 12

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