4-4
Front Panel Controls
4.2 NR THRESHOLD Control
This rotary control provides a threshold setting range from +30 dB to -60 dB
for a chosen NR MODE (described in section 4.1). When audio program is
present at the channel input, the NR MODE LED's provide an indication of
noise reduction action for a given threshold setting. The actual position of
this control will vary with program content (i.e. dynamics, composition, etc).
For NR MODE A, an optimum noise reduction setting is achieved when the
yellow (-10) LED and green (0) LED flashes alternately with each audio pro
gram peak and pause. At this point, the noise reduction circuits provide the
greatest downward expansion of the "Ax Sidechain" signal, as the program
signal drops below the NR THRESHOLD setting (refer to Fig. 4-3).
For NR MODE B, a proper noise reduction setting is achieved when the red
(-) and yellow (0) LED's alternately flash between audio program pauses or
breaks. At this point, the shelving circuit will cut the high frequencies, as the
program signal drops below the NR THRESHOLD setting (refer to Fig. 4-4).
As you adjust the other parameters (i.e. TUNE, PEAKING, etc), you will
need to trim the NR THRESHOLD control to achieve the optimum setting.
Refer to Section 5, entitled APPLICATIONS, for some example settings.
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