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764 Digital Audio Monitor User Manual
53
The De-emphasis Submenu
The De-emphasis submenu, shown in Table 3, lets you select the
appropriate de-emphasis for each of the four input channels. Enter
the De-emphasis submenu from the TOP menu level by scrolling the
highlight to the De-emphasis item and pressing a soft button. Then
scroll the highlight to the desired channel. The four submenu items
are identical, except for the affected channel.
Table 3: De-emphasis submenu
Item Choices Factory setting
Channel #
(Where # = 1, 2, 3, or 4)
NONE
AUTO
CCITT J.17
50/15
NONE
Selecting either CCITT J.17 or 50/15 will force that type of
de-emphasis. When AUTO is selected, the 764 will apply the
appropriate de-emphasis if either CCITT J.17 or 50/15 emphasis is
indicated in the channel status data of the digital input signal.
If you choose de-emphasis, please be aware that—although the 764
will continue to use raw input data when reporting MUTEs and
CLIPs— the level meters and session statistics will measure and
report levels in the de-emphasized signal. Because de-emphasis
attenuates the higher frequencies of a signal, selecting de-emphasis
may result in meter readings and true peak statistics that understate
the actual signal levels.
When any type of de-emphasis has been selected, it is indicated by a
“flag” on the display above the meter pair, as shown in Figure 34. In
the configuration pictured, de-emphasis has been selected for input
channels 1, 2, and 3—but not for channel 4. (If de-emphasis was
also not selected for channel 3, the “De-emp” flag would not appear
above the right-hand meter pair.)