Encoding Audio Into Hdmi Stream; Encoding Internal Audio Into Hdmi Content Stream; Encoding External Audio Into Hdmi Content Stream - Quantum Data 802BT User Manual

Encoding audio into HDMI stream

Encoding internal audio into HDMI content stream

Encoding external audio into HDMI content stream

2 Chapter 1 Testing HDMI Devices
This section describes how to encode audio signals, for internal and external sources, into
the HDMI stream output from the generator.
The HDMI generator can generate an audio stream sinewave signal, which is output with
the HDMI signal. The audio stream is IEC 60958-3 Consumer LPCM, with left and right
channels.
The digital audio stream uses 16 bits per sample. The ARAT command (page 6) can set the
sampling frequency at 32.0, 44.1, or 48 (default) KHz.
The audio stream is a sinewave with a frequency between 20 and 20,000 MHz, and an
amplitude between -96.3 and 0.0 dBFS. The SRAT command (page 22) controls the
frequency. The SAMP command (page 18) controls the amplitude.
To encode an internal audio source with the HDMI output:
1. Establish a command terminal connection with the generator, using HyperTerminal or
VGM.
2. At the R:> prompt, enter SDMG 1 to configure the generator to use internal audio,
rather than external audio.
3. Load one of these images to generate the audio signal:
Audio_L Outputs left channel only.
Audio_R Outputs right channel only.
Audio_LR Outputs left and right channels.
4. To adjust the amplitude (in decibels, full scale), press the Step button, and then turn the
Image knob. The SAMP command can also be used to control the amplitude.
The amplitude setting is saved until you change it again.
Currently, the HDMI generator outputs only basic audio signals. However, it can encode
audio signals from an external source, such as a DVD player, with the HDMI content
stream. The audio stream type must be Linear PCM.