02.17.2008 08:53 AM
Originally featured on BroadcastEngineering.com
New synchronizer reduces cost, complexity of HD systems
Shipping now, Crystal Vision's latest HD product, SYNNER HD, combines the functionality of a video synchronizer, audio delay tracker, embedder, de-embedder and audio processor. Not only does the product’s multifunctionality give enhanced flexibility to the system designer, it also brings significant cost and space savings.
With its most common use as a straightforward video synchronizer for embedded audio environments, SYNNER HD has a long list of synchronizing features. SYNNER HD offers the advantages of a line synchronizer, with a short minimum delay of 2us and quick recovery of input timing. SYNNER HD can both synchronize incoming video signals that are not locked to the local reference and compensate for timing delays within the video system. Its ability to crosslock means that an HD or SD input can be referenced to either HD trilevel syncs or SD black, allowing it to use any existing timing signals. The output timing relative to the reference can be adjusted through the entire frame using horizontal and vertical settings. SYNNER HD offers a powerful and unique synchronizing system, synchronizing at three separate points, which allows it to avoid picture disturbances for switches on the input that are between mistimed sources and that occur in the vertical blanking. Manual freeze allows it to be used as a simple still store, while automatic freeze is available when input fails through signal loss.
SYNNER HD includes internal audio delay tracking, which tracks the video delay, running the audio fast or slow to ensure the video and audio stay correctly timed and to avoid lip sync errors. Up to 20ms of fixed audio delay can be added on top of the tracking to compensate for early audio.
By fitting the standard Crystal Vision piggybacks to the motherboard, SYNNER HD can also include an audio embedder or de-embedder for analogue or digital audio — allowing the embedding of one or two groups of audio into the video or the de-embedding of one or two groups of audio timed to the system. Crystal Vision is well known for the powerful audio routing that appears across its range, and SYNNER HD provides full channel shuffling via its 16 x 8 mono router that allows the audio tracks to be rearranged between the two groups and additionally replace audio where an input piggyback can be used to overwrite some of the original audio channels from the HD or SD feed.
SYNNER HD also offers powerful audio processing capabilities. The audio level can be increased or decreased to match the rest of the system, with each mono audio channel offering individual gain control, adjustable between +3dB and -3dB in .1dB steps. Audio channels can be muted, while stereo to mono conversion helps those broadcasting a multilanguage service. Forward error correction ensures that audio quality is maintained.
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