Grass Valley iControl V.6.02 - Manual (Page 446)

Fingerprint Comparison and Analysis
Fingerprint Comparison and Analysis
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iControl allows you to designate groupings of input sources. These Comparison Groups are
comprised of those signals being compared to one another. Each comparison group is a
subset of the overall pool of available input sources.
Regardless of the fingerprint comparison mode you choose (lip sync, video, or audio), one of
the sources in each comparison group must be designated as the Reference source. The
Reference source is the source each Probed source is compared to.
In the case of lip sync error detection, the Reference source is a point where the audio/video
synchronization is known to be good and that is upstream to all the Probed sources. In the
cases of both the video content and audio content comparisons, the Reference source is the
baseline each of the Probed sources is compared to.
An Application Server, equipped with a Fingerprint Analyzer Service, can read the fingerprints
of simultaneous input feeds and compare them to the reference. iControl uses the fingerprints
to perform a comparison and analysis, and provides a real-time view of the results on its
Status tab as well as in the GSM Alarm Browser.
This feature supports the following Densité cards as both probed and referenced input
sources:
• ADX-3981 (3Gbps/HD/SD 8 AES audio and Metadata de-embedder)
• AMX-3981 (3Gbps/HD/SD 8 AES audio and Metadata embedder)
• EAP-3901 (3Gbps/HD/SD embedded audio and Metadata processor)
• EAP-3101 (SD embedded audio and Metadata processor)
• HCO-1822 (HD/SD/ASI change-over with clean switch and ALC)
• HLP-1801 (HD/SD lip-sync probe)
• XVP-3901 (3Gbps/HD/SD up, down, and cross converter with audio processor)
Notes
• A fingerprinting point can be re-used in multiple comparison groups as a
reference or a probed point.
• Fingerprinting Densité cards can be distributed among multiple Densité
frames, managed by multiple Application Servers as long as there is network
connectivity between the Applications Servers and the Densité frames.
• A maximum delay of +/- 4 seconds between the reference and probed signal
is tolerated. This range can be extended programmatically if required.