Phonic i2600 Manual Del Usuario página 19

The AGC implemented in the i2600 is acting on the evaluation of
an input signal which is an averaged one on a 50ms time frame,
and representing actually the RMS value of the input signal itself,
so as to make the AGC action "more musical".
If the output signal of the AGC process exceeds the defined
Threshold (Cmp Thr), thus becoming too loud, a compression
process will occur.
The speed and the amount of the Expansion can be defined
through the "Exp Time" and "Exp Ratio" parameters, while the
speed and the amount of the Compression can be defined through
the "Cmp Time" and "Cmp Ratio" parameters.
When the signal coming out from the AGC process (Output),
applied to the AGC input, is above the "Exp Thr" and below the
"Hold Thr", it is expanded up to the max expansion co-efficient
defined by the Exp Ratio.
When the signal coming out from the AGC process (Output),
applied to the AGC input, is above the "Cmp Thr", it is compressed
up to the min compression co-efficient defined by the "Cmp Ratio".
When the AGC output is comprised within the "Hold Thr" and
the "Cmp Thr" Thresholds, no further expansion or compression
actions will be taken.
Particularly, if the averaged AGC output level is "entering" the
signal "hold" area coming from the expansion area, then the co-
efficient computed by the AGC for multiplying the input level in
order to get the proper output signal, will be higher than one (if the
"Exp Ratio" will be set at 1:2), so as the coefficient will be lower
than one (if the "Cmp Ratio" will be set between 2:1 and 16:1) if
the averaged AGC output level is "entering" the signal "hold" area
coming from the compression area.
The i2600 software's Automatic Gain Controller setting menu is as
displayed below:
Bypass – from the Sw interface also is possible to activate or less
the AGC process. This can be done checking or not the Bypass
check box.
Exp Time – this control is used to set the AGC Expansion time
from 0.057 seconds up to 14.4 seconds.
Cmp Time – this control is used to set the AGC Compression time
from 0.014 seconds up to 6 seconds.
Cmp Thr – this control is used to set the AGC Compression
Threshold from -14 dBu up to +16dBu.
Exp Thr – this control is used to set the AGC Expansion Threshold
from -54 dBu up to -4 dBu.
Hold Thr – this control is used to set the AGC Threshold of the
AGC Signal "Hold" area, from -34 dBu up to +15dBu.
i2600
Exp Ratio – this control is used to set the AGC Expansion Ratio
from 1:1 up to 1:2. When the Expansion Ratio is set to 1:1, the
signal will not be expanded regardless of the threshold. If the
Expansion Ratio is set to 1:2, the signal can be expanded up to an
amplitude that is twice the original signal.
Cmp Ratio – this control is used to set the AGC Compression
Ratio between 1:1, 2:1, 4:1, 8:1 and 16:1. When the Compression
Ratio is set to 1:1, no actual compression will occur regardless of
the threshold settings. If the Compression Ratio is set to 2:1 or
more, the signal can be compressed to a min amplitude that is
dependent on the ratio and can reach 1/16
amplitude.
Delay
On this page it is possible to set the input channels Delay Time
anywhere between 000.0000mS and 598.998ms in steps of 1mS
or 20.8uS. Use the PM2 encoder to set the Delay Time in steps of
1mS and the PM3 for "fine" delay time adjustment in steps of 20.8
microseconds.
Input -A&B
Delay = 0.000m
Equalizers
Select EQ – This submenu allows you to set the kind of EQ to
place in the input signal path. A 15-band Graphic EQ and a 7-band
Parametric EQ are both available.
Input -A&B
Select EQ = GEQ 15 band
When a previously set EQ type is discarded in favor of another EQ
type, the previously set EQ's settings will be kept and applied if
said EQ type is later recalled again.
EQ Byp – From this submenu it is possible to bypass or to make
active the selected EQ placed on the input signal path. When the
selected EQ is bypassed, its current settings will not be lost.
Input -A&B
EQ Bypass = Off
15-band Graphic Equalizer
If the 15-bands Graphic Equalizer is selected, you can press the
ENTER button to access the EQ setting submenu and edit the gain
of each of the EQ's 15 peaking bands. Each frequency of the GEQ
is predetermined, and each filter's "Q" value is set permanently at
2.2 allowing a 2/3 octave width.
The 15 frequencies of the graphic equalizer are set at the following
values: 25Hz, 40Hz, 63Hz, 100Hz, 160Hz, 250Hz, 400Hz, 630Hz,
1.0k, 1.6kHz, 2.5kHz, 4.0kHz, 6.3kHz, 10kHz, 16kHz.
Once you have entered the filters' editing page, the PM2 or PM3
encoders can be used to adjust the gain range between -12dB
and +12dB. To scroll between the 15 filters, the NAV/PM1 encoder
can be used.
of the original signal
th
Delay
Sel EQ
EQ Byp
15