Yamaha AW2400 owner manual 241, Expander EXP parameters, CompanderH CPH CompanderS CPS parameters

Dynamics Parameters

■ Expander
	dB
	+20
	+10	Expansion ratio = 2:1
	0	Knee = knee5
Level	–10
	–20							Threshold = –10dB
Output	–30
	–40
	–50
	–60
	–70									dB
	–70	–60	–50	–40	–30	–20	–10	0	+10	+20

Input Level

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.

Expander (EXP) parameters:

Parameter	Value
Threshold (dB)	-54 to 0 (541 points)
Ratio	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)
Attack (ms)	0 to 120 (121 points)
Outgain (dB)	0 to +18 (181 points)
Knee	hard,1,2,3,4,5 (6 points)
Release (ms)	6 ms to 46.1 sec (160 points)

•Threshold — determines the level of input signal required to trigger the expander. Signals above the thresh- old pass through unaffected. Signals at and below the threshold level are attenuated by the amount specified using the Ratio parameter. The trigger signal is deter- mined using the KEYIN SOURCE 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
dB
+20
+10			Width
0
–10
Level –20								Threshold
–30
Output –40
–50
–60
–70									dB
–70	–60	–50	–40	–30	–20	–10	0	+10	+20

Input Level

A compander is a compressor-expander-a combination of signal compression and expansion. The compander attenu- ates 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.

CompanderH (CPH) and

CompanderS (CPS) parameters:

Parameter	Value
Threshold (dB)	-54 to 0 (541 points)
Ratio	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)
Attack (ms)	0 to 120 (121 points)
Outgain (dB)	-18 to 0 (181 points)
Width (dB)	1 to 90 (90 points)
Release (ms)	6 ms to 46.1 sec (160 points)

•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 deter- mined using the KEYIN SOURCE 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 (30 dB) and a high threshold (0 dB), 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.

Appendix

AW2400 Owner’s Manual

241