Yamaha O2R Manual Do Utilizador

Dynamics

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.

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.

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.

 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.

sets the compander’s output signal level.

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.

 determines how soon the compander returns to its normal gain 

once the trigger signal level drops below the threshold.

*1

These values are obtained when the sampling frequency is 48kHz.

*2

These values are obtained when the sampling frequency is 44.1 kHz.

*3

These values are obtained when the sampling frequency is 32 kHz

–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)

5 ms to 42.3 sec

 *1

, 6 ms to 46.0 sec

 *2

, 

8 ms to 63.4 sec

 *3

(160 points)