Tektronix WFM2200A, User Manual

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Elements of the Audio Control Packet display.
The elements of the Audio Control
Packet display vary depending on the monitored signal.
■ Group 1 through n : Shows the audio group number of the audio control
packet to be used for decoding.
■ DID : Shows the Data Identifier of the ancillary data packet for the audio
control packet. For specific information about permissible DID values, view
the help file in your instrument: while the Audio Control display is active in a
tile, press the HELP button and follow the link at the bottom of the page to
Audio Control Packet Display Elements .
■ Data Block : Always 200h for HD. If SD is present, this increments by
1 when consecutive data for each DID is present, or when data blocks within
a common data ID are to be linked.
■ Data Count : 10Bh for HD. For SD, the data count represents the number of
user data words to follow, up to a maximum of 255 words.
■ Field/Line : Shows the field of the audio from which the packet was acquired.
The line of the audio (within the field) from which the packet was acquired.
■ Checksum : Shows the checksum word that was recovered from the acquired
packet.
■ Should be : Shows the checksum word computed by the instrument, based on
the packet data.
■ Channel : Shows the specific channel(s) to which the Audio Frame, Rate
(kHz), Active Chan, and Delay Samples data apply. The AES stream allows
up to 16 channels of audio data, and every 4 channels are transmitted together
as an audio group.
■ Audio Frame : Audio frame (AF) number data provide a sequential
numbering of video frames that indicate where they fall in the progression of
the non-integer number of samples per video frame (audio frame sequence).
The first number of the sequence is always 1 and the final number is equal to
the length of the audio frame sequence. An audio frame value of one or more
zeroes indicates that frame numbering is not available.
■ Rate (kHz) : Shows the audio sampling rate.
■ Active Chan : Shows whether the audio channel is active or inactive.
■ Delay Samples : Shows the amount of accumulated audio processing delay
relative to video, measured in audio sample intervals.
Status pop-up menu (Audio Control Packet display).
Press and hold the STATUS
button to open the Status pop-up menu. The following menu selections are
available:
■ Display Type and ARIB Display: Use the arrow keys to select a status
display. See To select a status display on page 108.
■ Mute Alarms: Mutes alarms for all of the Status display types. An Alarms
Muted icon appears in the Status Bar. See Status bar icons on page 40.
Display modes
114 WFM2300 and WFM2200A Waveform Monitors User Manual