Testing Multi-Channel Compressed Hdmi Audio Formats - Quantum Data 881 User Manual

Testing multi-channel compressed HDMI audio formats

Chapter 9 Testing HDMI Sink Devices
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9. Enable and view image versions for the AudioRAT image as follows:
a. Press the Options key. The following menu appears on the 882's display:
-More
-NoGamma
-Noise
b. Choose the More item by pressing the adjacent soft key until a + and Rendition
appears next to the item.
+More Rendition: 000
-NoGamma
-Noise
c. Press the + and - keys to advance through the image versions to change the audio
sampling rate.
Alternatively, to enable and view an image version using the command line interface,
enter the following commands:
ISUB 1 // Enables sub images
IVER 1 // Specifies the first image version
IMGU // Activates the image version
10. When testing is complete, disable image versions by pressing the Options key and
choosing More until a '-' (minus sign) appears next to it.
Alternatively, to disable image versions using the command line interface, enter the
following command:
ISUB 0 // Disables sub images
11. To test another HDMI audio output channel or format, repeat the procedure.
The 882E instrument enables you to test HDMI compressed audio formats such as AC3,
EAC3 and the HDMI 1.3 high bit rate lossless compressed audio such as Dolby TrueHD
format. TrueHD's may carry up to 8 discrete audio channels, at a sample depth & rate of
24-bit/96 kHz (Blu-Ray Disc format specification allows also for encoding up to 6 channels
at 192 kHz).
Multiple scenarios are provided that allow you to test all audio channels at different
amplitudes and frequencies, as well as test using the different supported sampling rates.
The sampling rate for all channels is completed through a single image (AudioRAT).
Red+
Green+
Blue+
Red+
Green+
Blue+