Yamaha aw16g Manual De Usuario

175

■ Expander

An expander is another form of automatic level control. 
By attenuating the signal below the threshold, the 
expander reduces low-level noise and effectively 
increases the dynamic range of the recorded material.

Threshold determines the level of input signal required to 
trigger the expander. Signals above the threshold pass 
through unaffected. Signals at and below the threshold 
level are attenuated by the amount specified using the 
Ratio parameter. The trigger signal is determined using 
the KEY IN parameter.

Ratio controls the amount of expansion-the change in 
output signal level relative to change in input signal 
level. With a 1:2 ratio, for example, a 5 dB change in 
input level (below the threshold) results in a 10 dB 
change in output level. For a 1:5 ratio, a 2 dB change in 
input level (below the threshold) results in a 10 dB 
change in output level.

Attack controls how soon the signal is expanded once 
the expander has been triggered. With a fast attack time, 
the signal is expanded almost immediately. With a slow 
attack time, the initial transient of a sound passes through 
unaffected.

Out Gain sets the expander's output signal level.

Knee sets the transition of the signal at the threshold. 
With a hard knee, the transition between unexpanded 
and expanded signal is immediate. With the softest knee, 
knee5, the transition starts before the signal reaches the 
threshold and gradually ends above the threshold.

Release determines how soon the expander returns to its 
normal gain once the trigger signal level drops below the 
threshold.

■ Compander

A compander is a compressor-expander-a combination 
of signal compression and expansion. The compander 
attenuates the input signal above the threshold as well as 
the level below the width. For very dynamic material, 
this program allows you to retain the dynamic range 
without having to be concerned with excessive output 
signal levels and clipping.

Threshold determines the level of input signal required to 
trigger the compander. Signals above the threshold pass 
through unaffected. Signals at and below the threshold 
level are attenuated by the amount specified using the 
Ratio parameter. The trigger signal is determined using 
the KEY IN parameter.

Ratio controls the amount of companding-the change in 
output signal level relative to change in input signal 
level. With a 2:1 ratio, for example, a 10 dB change in 
input level (above the threshold) results in a 5 dB change 
in output level. The hard compander (CPH) has a fixed 
ratio of 5:1 for expansion and the soft compander (CPS) 
has a fixed ratio of 1.5:1 for expansion.

Attack controls how soon the signal is companded once 
the compander has been triggered. With a fast attack 
time, the signal is companded almost immediately. With 
a slow attack time, the initial transient of a sound passes 
through unaffected.

Out Gain sets the compander's output signal level.

Width is used to determine the distance, in decibels, 
between the expander and the compressor. With a width 
of 90 dB, the expander is effectively switched off and the 
compander is simply a compressor-limiter. With a 
smaller width (30dB) and a high threshold (0dB), the 
compander is an expander-compressor-limiter.

Release determines how soon the compander returns to 
its normal gain once the trigger signal level drops below 
the threshold.

Threshold (dB) –54 to 0 (55 points)

1.0, 1.1, 1.3, 1.5, 1.7, 2.0, 2.5, 3.0, 3.5, 
4.0, 5.0, 6.0, 8.0, 10, 20, 

∞

 (16 points)

0 to 120 (121 points)

0 to +18 (36 points)

hard,1,2,3,4,5 (6 points)

6 ms to 46.1 sec (160 points)

Threshold (dB) –54 to 0 (55 points)

1.0, 1.1, 1.3, 1.5, 1.7, 2.0, 2.5, 3.0, 3.5, 
4.0, 5.0, 6.0, 8.0, 10, 20 (15 points)

0 to 120 (121 points)

–18 to 0 (36 points)

1 to 90 (90 points)

6 ms to 46.1 sec (160 points)