Grass Valley 8914 - Manual (Page 7)

8914 Instruction Manual 1
8914 Dual AES/EBU Delay
Distribution Amplifier
Introduction
As the transition to digital video and audio accelerates, there is an
increased need to delay the audio associated with broadcast video. This is
due to the relatively large processing times associated with DVEs and
switchers. The 8914 provides a low cost and easy-to-use solution to the lip
sync errors associated with these large delays. Minimizing space require-
ments, the 8914 provides two fully controllable delay paths on a single
board, allowing up to 20 delays (ten modules) in a two rack unit frame. If
instead of two delays you require more distribution, the first channel can
be passively looped to the second channel to produce seven outputs. The
8914 is also a full-featured reclocking distribution amplifier that fits inthe
8900 series frame.
A clock referenced to the applied input reclocks all outputs in each section.
The delay is set using 16-position rotary switches on the front of the
module. There are fine and coarse rotary adjustment switches for each
delay channel.
The 8914 offers the following features:
■ Two full-function delays on a single board,
■ All outputs reclocked to reduce jitter,
■ Up to one half second delay in approximately 2 ms increments,
■ Support of 32, 44.1 and 48 KHz sample rates,
■ Four outputs on channel one, three outputs on channel two,
■ Loop-through input on channel one enables redundant system design,
■ Accepts input cable lengths of up to 1000m (Belden 8281 or equivalent),
and
■ Up to twenty AES/EBU delays in a 2 RU 8900 Frame.