Audio Analysis - Quantum Data Gen 2 980 User Manual

980 HDMI Protocol Analyzer User Guide

10.3 Audio Analysis

The Audio (Data) Analysis feature enables you to detect inconsistencies in the metadata relating to the sampling
rate and the audio clock regeneration values. The following items are listed and/or verified during the test:

Sampling rate shown in the Audio Infoframe.

Sampling size (bit depth) in the Audio Infoframe.

Channel count in the Audio Infoframe.

N and CTS values in the Audio Clock Regeneration packets.

Audio type listed in the Channel Status Blocks.

Sampling frequency in the Channel Status Blocks.

Original sampling frequency listed in the Channel Status Blocks.

Channel count listed in the Channel Status Blocks.

Sampling rate calculated from the audio samples.

Rate that the ACR packets are transmitted.
The setup procedures described above in the section:
should be followed for the audio analysis tests. These setup procedures are listed below:
1. Configure the 980 HDMI Protocol Analyzer in the proper mode HDMI.
2. Set the threshold of the +5V.
3. Configure the 980 HDMI Protocol Analyzer Rx port with the proper EDID.
4. View the incoming video in real time to check the status of the device under test.
To run the audio analysis test:
1. Select the 980 that you are using to capture the data from your HDMI source device under test.
2. Set the Capture Buffer Size slidebar to a percent value to meet your requirements. You can capture up to
about 2GB of data which is about 1150 frames at 576p/480p and about 204 frames at 1080p which includes
the video. Since you do not need to capture the video data for the audio analysis test, you can set this to a
lower value such as 5%.
Note: You do not need to set the Trigger Position or the Trigger Selection when running the Audio
Analysis test. The Trigger Position is always reset to 0% and the Trigger Selection is set to Vsync. These
settings occur as part of the test when you initiate the test.
3. Select the Std Tests tab under the Options section of the Capture Control panel (below).
Page 234
Analyzing HDMI Data with your 980 Protocol Analyzer
Rev. A1
December 19, 2012