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E-2

The nominal input level determines the level of a sinusoidal signal with a frequency of
500 Hz for which the set nominal deviation (see the "FM deviation" section) will occur with
the preemphasis switched off.

The AF inputs may be overdriven by a maximum of +4 dB starting over the nominal input
level. In case of higher input levels, the input signal will be clipped by the A/D converter.
This will cause certain signal components to be lost.

This clipping helps to avoid overdriving the following units. The threshold is set so that no
clipping occurs during normal operation.

The nominal input level is determined for a 2 kHz sinewave signal with 0 dBm in accordance
with the NICAM specification.

In the case of input levels deviating from the nominal input level, an appropriate gain or loss
(negative values) can be set for signals AF1 and AF2 under Gain Adjustment NICAM.

If the input levels are set as described under "Nominal input level", the drive reserves de-
fined in the NICAM specification will be available.

If the drive reserves are exceeded, the input signal will be clipped by the A/D converter. This
will cause certain signal components to be lost. This is indicated by the Input Clipping
NICAM status displays for inputs AF1 and AF2.