Specifications
Table 20: Audio Bar Displays (cont.)
Characteristic Performance requirement Reference inform ation
Metering Ballistic Types
Selectable from true peak, PPM Type 1,
PPM Type 2, and Extended VU
Peak Program Meter (PPM)
Ballistic Response
PPM Type I (IEC Type I, essentially the s ame
as DIN 45406 and Nordic N-9)
PPM Type II (IEC Type II, the same as IE EE
std. 152-1991)
PPM Type I has a slightly faster attack time
and a faster return time, 1.7 seconds to fall
20 dB as opposed to 2.8 s econds for Type II
True Peak Ballistic Response PPM Type II decay characteristics, no attack
delay, factory default ballistic
Extended VU Ballistic Response
VU meter as defined in IEEE 152-1991, but
with an extended dB-linear scale. T he meter
bars also c ontain true peak indicators when
VU is selected
Peak Hold True peak indicator remains at the most
recent peak for a user selectable time of 1 to
10 seconds
Clip Indication Delay C ount Consecutive FS samples for Clip Indication,
user selectable Off or 1 to 100. F actory
default is set to 1. A setting of 0 is equivalent
to “Off”
Mute Indication Delay C ount Consecutive “0” samples for Mute Indication,
user selectable Off or 1 to 100. F actory
default is set to 10. A setting of 0 is equivalent
to “Off”
Clip/Mute Error Readout Hold Time
1 to 30 seconds, user selectable. Factory
Default set to 2
Silence Indication Threshold
Audio level below which the signal will be
considered “silent”
Used to trigger on-screen indication and
alarms
Silence Indication Delay Off or 1 to 60 seconds, user selectable
Indication and alarm will not be asserted
until signal stays below the silence threshold
for this number of consecutive seconds.
Factory default is set to 10. A setting of 0 is
equivalent to “Off”
Over Indication Threshold
Audio level above which the signal will be
considered “over”
Used to trigger on-screen indication and
alarms
Waveform Monitors Specifications and P erformance Verification 19
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