Vax M-9000 operating instructions I N R a T I O

(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."

Setting Range

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

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)

3:3 (Default)

6
			6:3
3
0	3	6	Amount of change
(Reference level)
			in noise level (dB)
–3
			6:–3
–6
			3:–3

(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
ANC adjustment value	Reference level

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.

Setting Range

–10 to 10 dB (default: 0 dB), 1 dB steps

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.

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