By Vijaya Cherian
Building on the success of its Standard Definition video synchronisers, Crystal Vision has released its first HD synchroniser - the SYN HD.
Building on the success of its Standard Definition video synchronisers, Crystal Vision has released its first HD synchroniser - the SYN HD. Working with both HD and SD and aimed primarily at applications without embedded audio, SYN HD's ability to correct any timing problems makes it ideal for broadcast engineers who need to bring untimed HD or SD video into their system.
SYN HD can both synchronise incoming video signals which are not locked to the local reference and compensate for timing delays within the video system. Synchroniser mode is designed for external sources that are not timed to station references, with SYN HD taking its timing from the external analogue reference and automatically synchronising sources between 0 and 2 fields, fixing any incorrect frame rates plus any delays. The output timing relative to the reference can be adjusted through an entire frame using horizontal and vertical settings. Delay mode is ideal for when the frame rate is correct but the source has been passed through equipment such as a chroma keyer and therefore been delayed for a few lines, with the engineer able to set a fixed delay of between 2us and one frame.
One of SYN HD's special features is its ability to cross-lock. This means that an HD input can be referenced to either HD tri-level syncs or SD Black and Burst and similarly an SD input can be referenced to either Black and Burst or tri-level syncs. Many installations already have SD reference signals in place and SYN HD can therefore use these existing timing signals, removing the expense and upheaval involved in providing separate HD syncs distribution.
One of the features that distinguishes SYN HD apart is its synchronising system. SYN HD synchronises at three separate points - at the start of the field or frame, just after the switching point, and at the start of the active field or frame - which allows it to avoid picture disturbances on input switches.
Manual freeze allows SYN HD to be used as a simple still store, while automatic freeze is available when input fails through loss of signal, with the response selectable as blue screen, black screen, delay then blue or delay then black. A TTL level pulse allows an audio delay to track the delay through SYN HD, while up to eight set ups may be stored for later recall. If the input and output frame rates are locked together then SYN HD may be set to pass through embedded audio transparently.
SYN HD is a space-saving 100mm x 266mm module which fits in Crystal Vision's standard frames alongside any other HD or SD product from the range, allowing 24 boards in 4U, 12 in 2U, six in 1U and two in a desk top box.
SYN HD is shipping now.