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Specifications
1–38
AM700 Audio Measurement Set Service Manual
Table 1–24: Audio monitor (cont.)
Capabilities Description
Listen capability
LISTEN A user can listen to input channels.
Table 1–25: Digital interface tester
Capabilities Description
Intended Use The digital interface tester application is used to monitor and troubleshoot
the digital audio interface. It allows you to view incoming data streams at
the logical (bit), or electrical interface level, and to create special signals to
probe the interface.
Number of Primary Modes There are four major modes of operation.
Bit Activity Displays instantaneous bit probability (with no history or averaging) of each
bit of each subframe. The four preamble bits are not available to be
displayed, and are grayed out in the display.
Channel Status Displays the current contents of the 192 channel status bits in both
subframes of the digital input stream. The data can be displayed in four
styles:
Binary (most-significant-bit or MSB on the left)
Transmission order (MSB on right)
Hex (same bit order as binary, displayed in base 16)
Decoded (raw data translated into words)
In the raw and decoded styles, the user can optionally underline data
elements which differ between the two subframes. This allows a quick
visual check for identical subframe information.
The user can choose to display either the subframe 1 data, the subframe 2
data, or both subframes.
Eye Diagram Displays a “cloud of dots” representing an equivalent-time sampled
time-domain graph of the digital main inputs. In addition, the following
seven numeric readouts are displayed above the diagram in a real-time
readout box (when measurements are available for the category):
Measured sample frequency on the main input
Measured sample frequency on the reference input
Measured ratio between the main and reference sample frequencies
Phase difference between the main and reference
Voltage level of the main input
Equalization applied to the main input
Peak-to-peak jitter of the interface