So I got a quick impression of the "extended" AGC. Congratulations on that. Because of the 4-bands there are much more possibilities to display. Now it also adapts quite well to the preceding Auto EQ. So both thumbs up for the development.
But of course as always - a few details would still be quite nice, which e.g. Ariane Encore has. I quote here from the Ariane manual, which you can find here
. From my point of view these are a few more points that would round it off nicely.
Instantaneous Dynamic Range, or ‘IDR’ is the main setting to adjust the amount of
control action you wish your Ariane Encore to have. The IDR setting is the ‘size’ of the
RMS energy window in the windowing-release system. As long as the short-term
variations of the RMS energy in the audio remain within this range, the Ariane Encore will
stop making any changes to the gain in that band.
GATE AND RTZ
The Gate threshold control determines the point below which the Ariane Encore will not
seek to increase audio gain. Audio that falls above this threshold is considered valid, and
fair game to be brought up toward operating level.
The Gate adjustment can be set anywhere from a low of –35 dB below 0 dB nominal
reference operating level, to as high as –15 dB below 0 dB, in one-dB steps.
The higher the Gate threshold, the less any low level material will be boosted.
In addition, there is a parameter called ‘RTZ time’. This stands for ‘return to zero’. When
the audio energy in any band goes below and stays below the gate threshold for more
than 10 seconds, the control circuitry slowly returns the gain of that band to zero. The
time this takes is controlled by the RTZ Time parameter – the lower the number, the faster
This prevents the ‘rush-up’ of a quiet band, which could otherwise result in an increase
in the level of unwanted background noise or intentionally very quiet programme
material, such as that found in classical music, for example.
The Mix controls for each band control the output levels after processing, in a range of
+5 to –5 dB. These controls allow you to tailor your spectrum the way you like, or to
compensate for another piece of equipment, if necessary.
We normally recommend you keep these controls to ‘flat ‘ (0dB), and make your
spectral manipulations elsewhere.
BAND TO BAND COUPLING
The flexibility of the Ariane Encore is enhanced by various coupling and restriction
The Low frequency band (B1) can be restricted from ever adding more gain than is userspecified, with respect to the dynamic gain of the Low Mid band (B2), using the
preset|agc|xxx params|b21 coupling: (setting in dB) menu setting.
Similarly, using the menu setting:
preset|agc|xxx params|b34 coupling: (setting in dB)
...the high frequency band (B4) can be restricted from adding more gain than is userspecifed, with respect to the dynamic gain of the High Mid (B3) band.
(b21 means ‘band 2 to 1’, and b34 means ‘band 3 to 4’. These parameters are
duplicated within the ‘matrix params’, ‘stereo params’ and ‘dual mono params’
submenus – for clarity we’ve just put ‘xxx’ above).
When enabled, the restriction controls make it impossible for the low and high bands to
ever operate with more than a specified amount of gain beyond that of the adjacent
band (note: they are always free to operate with less gain).
PROTECTION PEAK LIMITING
The Ariane Encore has a built-in lookahead limiter before its output for protection
In the menu ‘preset|xover’, the crossover frequencies between bands 1/2, 2/3 and 3/4
can be adjusted. We think the default values are the best, but your mileage may vary!
In addition, this menu includes a high-pass filter. Since in FM broadcasting, audio below
50Hz is largely unwanted and unheard, you may choose to enable the high pass filter to
remove audio below this, or below a choice of other low frequencies.
In any case my respect for the entrance to my criticism concerning the AGC. I am very happy that an adjustment has been made here.