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8 copy protect LED
This LED lights when the Nº30.6 detects encoded copy protection
in the digital program being processed.
9 aes/ebu LED
The aes/ebu LED lights when the Nº30.6 detects that the digital
program being processed conforms to the AES/EBU (Audio Engi-
neering Society/European Broadcast Union) professional standard.
This LED indicates the presence or absence of certain encoded in-
formation in the digital signal. It does not indicate that the AES/EBU
connections (a connection standard written by the same group)
are being used. Playback of non-
AES/EBU CDs or DATs won’t acti-
vate the aes/ebu LED, even if the associated transport is con-
nected according to the
AES/EBU standard
10 emphasis LED
The compact disc standard, as created by Sony and Philips, allows
a high-frequency boost to be employed during recording. This
boost, called recording pre-emphasis, increases the signal-to-noise
ratio at high frequencies, but must be countered by a high-fre-
quency cut before playback to restore a recording’s normal fre-
quency response. De-emphasis may be done as the recording is
being mastered, or the compact disc (or digital audio tape) may be
made with the pre-emphasis still on, and the de-emphasis per-
formed in the playback unit.
In the Nº30.6, the de-emphasis filtering is done in the digital do-
main.
The emphasis LED lights when the Nº30.6 detects recording pre-
emphasis in the digital program being processed, and subse-
quently employs its de-emphasis circuitry (see “Specifications”).
Note: The de-emphasis circuitry of the Nº30.6 is designed
to be compatible with all known digital standards.
However, it is possible for the emphasis LED to light
in error when there is no disc being played. This is
not a malfunction of the Nº30.6. Rather, it is the re-
sult of the transport generating ambiguous signals in
the absence of a spinning disc to read. You may never
see this condition. Even when the condition exists, it
has no effect on sonic quality, as it can only occur
when there is no disc playing.
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