Audio Processing; Audio Insertion Delay; Tracking Delay - pro bel V6402 HD User Manual

3.6

Audio Processing

The audio processing capabilities of the V6302/AP Advanced Audio Processor module can be utilised by
any of these modules by combining the V6302/AP module with the V64xx module in a V16HR3D Double
width or V16HR3E Triple width rear module. No Option needs to be set, just combining any of these
modules with a V6302/AP will automatically enable this functionality.
The V6302/AP has an all-digital Audio Processing Engine (APE) that provides synchronisation, gain,
routing, fixed and tracking delay functions on the inputs and is intended for application in both Standard
Definition and High Definition installations. It has six AES inputs and four AES outputs on the rear panel.
An optional Dolby Decoder submodule has Dolby E
a maximum of 8 decoded channels plus a single downmixed stereo pair, all of which are inputs to the
Audio Processing Engine.
When combined the embedded audio is passed to the V6302/AP via the rear into the audio processor and
processed audio is then passed back from the V6302/AP to the V64xx module for embedding. This
essentially provides a further eight AES inputs and eight AES outputs to the V6302/AP APE. See the
diagram below for an overview of the signal relationship between the V64xx and the V6302/AP modules.
Video
Video In
Processing
Audio
DeMux
AES IPs
The V6302/AP can optionally be put in the audio path or not by the V64xx menu control VIDEO :
6302Data setting 6302 On or 6302 Off. See the V6302 User Guide for more information.
3.6.1

Audio Insertion Delay

Audio Demux : 710 us
Audio Mux : 710 us
V6302/AP including SRC : 4 ms (Plus any manually added audio delay set in the V6302/AP)
3.6.2

Tracking Delay

One of the main advantages of pairing a V6302/AP module with the V64xx is that the V6302/AP can track
the audio timing with the varying video delay when the frame synchroniser option is used. With just the SY
option the V6302/AP will apply the variable tracking delay according to the video delay through the frame
synchroniser. When the FD and SY options are used the V6302/AP will apply the tracking delay and also
compensate for the 4 ms V6302/AP audio insertion delay if the video delay set on the V64xx is greater
than 4 ms.
F
Things to remember:
If the video delay set on the V64xx is less than the insertion delay of the V6302/AP the audio will incur the
V6302/AP's insertion delay. The audio will always incur the audio mux and demux insertion delay when
used.
48
V6402, V6404, V6406,V6408
and V6418 HD converters
V6402AP
®
and Dolby Digital
V64xx & V6302/AP signal overview
Use V6302 Data
Path with AH Option
Or with V6402
Audio
SRCs
Processing
V6404AP V6406AP
®
decoding capability and provides
Key
Video
Audio
0
Audio Mux
1
AES OPs
V6408AP V6418AP
Video Out
Issue 6