18
sor regulates program levels more smoothly based on an average re-
sponse to the material.
The
DYNAMIC REDUCTION
screen is illustrated here:
Operating mode choices are made with the
t
and
u
select buttons.
These are:
LIMITER OFF
,
PEAK LIMIT ONLY
and
LIMIT AND COMPRESS.
The independent high frequency, pre-emphasis-protection limiter is
a separate function and is discussed on Page 20.
The Limit-Only
Mode
Although the 261 s limiter can be used entirely by itself (with AGC
and Compression turned off), we recommend using AGC ahead of
the limiter. The gentle gain-riding action of the AGC will ensure
that the limiter always operates in its optimum range, controlling
only the program peaks in an unobtrusive manner.
In the limit-only mode, limiter action is not gated. Note the solid
block at
0dB
on the
COMPRESSION/LIMITING
scale. Also note that
AGC has been enabled in this case, and that the gate is closed.
Peak reduction will be shown on the upper bargraph, with a peak-
hold segment showing the highest recent value of gain reduction, as
illustrated below. The lower bargraph indicates action of the AGC
as it maintains a constant input to the limiter.
Limiter Overload
When the limiter is used alone, or with compression, or even in con-
cert with the AGC when peaky material is processed, it is possible
that the limiter will be called on to work harder than expected. An
OVERLOAD
indicator flashes with a fixed duration whenever the
limiter attenuates more than about 18dB.
