Ensemble Designs 8500 Composite / SD Legalizer and Video Processing Frame Sync User Manual
Page 19
Audio Operational Examples
This section describes the audio configuration of the application examples given at the
beginning of this manual. Both the 8410 and 8510 have AES I/O and handle embedded
audio. For analog audio, an 8510 is required.
Audio Example 1: Let’s assume stereo analog audio is arriving from a satellite receiver
(not AES,as shown in the Satellite block diagram). We want to embed this audio on an
outgoing SDI video stream and also provide analog audio for monitoring. In addition we
wish to provide audio for use in an audio console with AES inputs. Tracking audio delay
will be used to maintain proper lip sync. We’ll be using an 8500 with an 8510 submodule.
1. Bring the analog audio into channels 1 and 2. Refer to the connector drawing for
pinout of the 15 pin D connector in the Cabling section.
2. With the In 1/2 Sel choose Anlg 1/2 as the source for channels 1 and 2 of the 4x4
audio mixer.
3. Set Anlg 1 Lvl and Anlg 2 Lvl to the nominal level of the incoming audio.
4. In the Audio Mix menu Select Ch1 for Output Bus 1 and Ch2 for Output Bus 2.
The mixer output buses automatically appear on the designated output pins of the
15 pin D connector in analog form, and on the AES output BNC’s as AES audio.
5. Select Embed On to embed the audio on to the SDI video output stream.
6. In the Aud Delay menu turn On the Auto Track so audio delay will track the video
timing.
Audio Example 2: Consider a situation where there is embedded stereo audio on
channels 1 and 2 of the incoming SDI video. A second language stereo feed comes in on
AES channels 1 and 2 as shown in the Microwave block diagram but the level is 4 dB
higher than desired.
1. SDI 1/2 is selected with the In 1/2 Sel so as to feed this audio to channels 1 and 2
of the 4x4 audio mixer.
2. AES 1/2 is selected with the In 3/4 Sel thus bringing the second audio information
into channels 3 and 4 of the 4x4 audio mixer.
3. Tie is selected and the channel 3 and 4 faders set to -4dB to correct the incoming
level discrepancy.
4. All 4 channels are then re-embedded on the outgoing SDI video by selecting Embed
On.
These same 4 channels are also available as 4 analog outputs and AES output channels.
It is now possible to monitor audio using the analog outputs from an 8510 while feeding
the AES outputs to a digital audio mixer for further usage.
8500-19
Model 8500 Series Modules