Grass Valley 8914 - Manual (Page 11)

8914 Instruction Manual 5
Adjustments, Testpoints, and Indicators
Delay Adjustments
Signal delay for each channel is set by two 16-position rotary switches that
provide additive coarse and fine adjustments. The amount of both the
inherent delay of the signal path and the increments of induced delay
varies according to signal data rate.
Table 1 provides delay figures for the
three accepted AES data rates—48 KHz, 44.1 KHz, and 32 KHz.
48 KHz Input Signal Example
Inherent (minimum) circuit delay with no set delay adjustment (rotary
switches at 0, 0) is 1.2 ms. Any switch setting above 0,0 masks the inherent
delay and, starting at 2 ms, adds the selected number of delay increments.
For example, setting Coarse to 0 and Fine to 1 produces 2 ms of delay. Each
additional Fine switch increment adds 2 ms.
Setting Coarse to 1 and Fine to 0 produces 32 ms of delay. Each additional
Coarse switch increment adds 32 ms.
Table 1. Delay Adjustment Settings
Input
Signal
Minimum Delay
(switches @ 0,0)
Adjustment
Adjustment
Increment
Incremental
Delay Range
48 KHz 1.2 ms
Fine 2 ms (96 frames)
2 ms to 510 ms
Coarse 32 ms (8 blocks)
44.1 KHz 1.305 ms
Fine 2.177 ms (96 frames)
2.177 ms to 555.9 ms
Coarse 34.88 ms (8 blocks)
32 KHz 1.799 ms
Fine 3 ms (96 frames)
3 ms to 765 ms
Coarse 48 ms (8 blocks)