Vax M-9000 - Manual (Page 45)

45
(A22) Gain ratio setting (when the AN-001T is used and ANC operation is set to ACTIVE)
G A I N R A T I O 3 : 3
Set the degree of change in the output sound level to that in ambient noise level, which is displayed as the
ratio "ambient noise level : output level."
6:3, 5:3, 4:3, 3:3 (default), 3:4, 3:5, 3:6, 6:–3, 5:–3, 4:–3, 3:–3, 6:–3, 5:–3, 4:–3, 3:–3, 3:–4,
3:–5, 3:–6 Setting Range
When the ratio of output level to ambient noise level is
great, the degree of change in output level becomes
greater than that in ambient noise level.
The greater the amount of change in output level is,
the faster the output level reaches the upper limit or
lower limit, causing the sound volume not to change
any more.
Contrary, when the ratio of output level to ambient
noise level is small, the degree of change in output
level becomes smaller than that in ambient noise level.
When the ratio of output level is positive, the output
level increases as the ambient noise level increases.
When the ratio of output level is negative, the output
level decreases as the ambient noise level increases.
For example, when the ratio "3 : 3" is selected, the
output volume level increases by 3 dB as the ambient
noise level increases by 3 dB.
Amount of change in output level (dB)
3
6
–3
–6
0
(Reference level) Amount of change
in noise level (dB)
3:3 (Default)
3:–3
6:3
6:–3
3 6
Adjust the reference level which is a starting point for detecting the amount of change in ambient noise level.
(Refer to the previous setting item.)
Though the reference level is automatically determined according to the input sensitivity set on its setting
screen, this adjustment screen allows the reference level to be manually adjusted under the actual condition
that ambient noise is collected by a microphone.
Make the adjustment for the broadcast zone when it is quietest.
Adjust the on-screen ANC adjustment value with the Parameter setting knob so that the on-screen reference
level becomes "0." Increase the ANC adjustment value when the reference level is higher than 0, and
decrease when the reference level is lower than 0.
Note
The reference level cannot be adjusted to "0" if it is over +10 or below –10.
In this case, reset the input sensitivity
(p. 39, p. 40-A4) to the value above the current level when the reference
level is higher than 10, and below the current level when smaller than –10.
–10 to 10 dB (default: 0 dB), 1 dB steps Setting Range
(A23) Reference level adjustment (when the AN-001T is used and ANC operation is set to ACTIVE)
A N C A D J 0 : S E N S 8
Reference level ANC adjustment value