Telestream PRISM MPI2-10, Руководство пользователя

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Application Information
Audio Application
PRISM MPI2-10-MPX2-10 User Manual
174
Test Level and Peak Program Level Indicators
Diamond-shaped markers between the level bars indicate the default Test level (-18
dBFS) and Peak level (-8 dBFS) limits for the display. Test level is also known as
Reference level or Line-up level.
Level Meter Scale and Units
By default, the units are in dB relative to full scale (dBFS). The 0 dB mark is digital Full
scale.
Lissajous Display
The phase of a selected pair of audio channels is plotted on a soundstage plot.
Soundstage plots the two channels at 45-degree angles, with the mono combination
appearing on the vertical axis, much like a left-right image in a studio.
To select the audio channel pair to plot on the Lissajous display, select the Volume icon
( ) on the Status Bar and choose from the list of available channel pairs.
Channel Correlation Meter
Displays the channel correlation under the Lissajous display.
•
For identical or highly correlated signals, the indicator is white and moves to the far
right (+1).
•
For highly correlated signals, the indicator is green and moves to the right (towards
+1).
•
For uncorrelated signals, the indicator is yellow and tends to stay in the middle
(around 0).
•
For anti-correlated signals (one goes up when the other goes down), the indicator
is red and moves to the left (towards -1).
This instrument displays messages within the level meter bars. These are messages that
can appear and are shown in order of priority:
UNLOCKED: The instrument is not locked to an incoming signal on the indicated input
channel. Data cannot be decoded and all data and other errors are ignored. This means
that if an input is selected, nothing recognizable is present on the input, or if
embedded audio is selected, the VIDEO input is unrecognizable.
PARITY: The incoming subframe does not have even parity as specified by the digital
audio standards. The data sample is unreliable and is ignored. The level meters and
Lissajous display treat the sample as a zero sample.
CRC ERR: The CRC code in the channel status packet is incorrect. Sometimes the CRC
code is set to zero, indicating that the signal is missing; when this is the case, this
message is not displayed.
MUTE: The number of consecutive all-zero samples equals or exceeds the # Samples for
Mute setting.