Tc-electronic P2 Manuel d'utilisateur télécharger pdf (Page 15)

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LOUDNESS PAGEMAIN PAGE

Target Level

Range: +10dB to -10dB

This is the level the Loudness controller will aim

at on its Output. Target Level is relative to

Reference Level on the Main Page.

Max Reduction

Range: -20dB to 0dB

This is the maximum attenuation the Loudness

Control is allowed to perform. If set to 0.0dB,

the Loudness Control cannot attenuate the

signal at all. The level diagram on the next

page is shown with Max Reduction set at

0.0dB.

Max Gain

Range: 0 to +20dB

This is the maximum gain the Loudness Control

is allowed to perform. If set to 0.0 dB, the

Loudness Control cannot add gain to the signal

at all.

Freeze Level

Range: -10dB to-40dB

Sets the minimum level required before the

Loudness Control will start adding more gain. It

would typically be set to avoid boosting signals

considered noise. The Freeze Level parameter

is relative to the Reference Level setting on the

Main page.

Freeze Hold

Range: 0 to 5 seconds

When the Input signal drops below the Freeze

Level, the Gain Correction of the Loudness

Section is frozen for the duration of the Hold

time. When the Hold period expires, the Gain

Correction falls back to 0dB gain.

LOUDNESS PAGE

Level Trim

Range: -18dB to + 18dB

Because P2 operates with 48 bit precision on

all audio internally, it is possible to correct

loudness manually without the risk of

overloads. The Level Trim can be used for

permanent off-sets or live loudness

adjustments.

Ratio

Range: 1:1.25 to 1:6

Ratio is the steering factor used when the

Loudness Control applies boost or attenuation

to reach the Target Level. The higher ratio, the

more rigid steering towards the Target Level.

Average Rate (Avg Rate)

Time constants in the Loudness Control are

changed dynamically with the Input signal

based on computations by multi-level detectors.

When the Output level is close to the Target

Level, gain changes are relatively slow.

The Average Rate offsets all time constants to

be faster or slower. Values below 1dB/Sec

produces a gain change gating effect when the

Output level is already in the target zone, while

values above 4dB/Sec will add density to

sound.

Slow Window

Range: 0 to 20 dB

The slow window is the area around the set

Target Level.

Within the slow window the Loudness is only

gently controlled. When the signal exceeds the

limits of the Slow Window the Loudness is

treated more radically. Depending on the set

Average Rate and Ratio.

Loudness meassure

ITU Leq Standard

TC Grid

Realtime control of loudness in Transmission

and Ingest. Grid complements and automates

loudness control in environments based on

recent ITU recommendations as well as Dolby's

LM100 meter. (See attached which shows

challenging broadcast segments, 30 seconds

each, butt edited and measured using a Dolby

LM100 meter. 1) Without P2 loudness control.

2) With P2 Grid loudness control).

Grid Loudness Limit and Loudness Correct

presets are available in Factory Preset Bank

F1. Presets have been tailored to comply with

current US, EU, Japan and BBC broadcast

standards.

Processing Modes

- Stereo. In this mode the Loudness, EQ and

Multiband sections operate in tandem:

Whatever gain change is applied to one

channel, is applied to the other. Also, many

parameters have mutual left and right

controls.

- Dual Mono. In this mode the Loudness, EQ

and Multiband sections treat the two Input

signals completely independently.

- Stereo Wide. In this mode the apparent

width and image of stereo signal can be

altered simultaneously with controlling

loudness and peak level. The left and right

signal is internally de-composed into an

M(Mono) and S(Stereo) component, and

reverted to left and right signals before peak

limiting on the Output.

- Sum Mono: Left and right channels are

summed after Delay, Filters and AGC.

- Left Mono: Left channel only is processed.

- Right Mono: Right channel only is

processed.

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Tc-electronic P2 Manuel d'utilisateur Page 15

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