Prism Sound ADA-8 Operation Manual page 19

Prism Sound ADA-8 Multi-channel A/D D/A Converter Operation Manual - Revision 1.00
specify 48kHz explicitly as the desired sample rate. In this case, the external wordclock
frequency is continually measured by the ADA-8, and an assessment is made as to whether it
is within an acceptable tolerance of a standard sample rate and, if so, what the rate is. If the
rate of the Wordclock is, say, close to 44.1kHz then the ADA-8 will assume it to be the 'house
44.1kHz' and will use it to sync the Path, BUT THE PATH WILL STILL RUN AT 48kHz or,
more precisely, at 480/441 times the reference rate. In this case, the '=Ext' LED would not be
lit. If it is desired that the Path's sample rate should always reflect the sample rate of the ref
sync, then '=Ext' should be selected in the sample rate menu. For more details of these
menus, see the Firmware Reference.
It is not uncommon to see flashing LEDs in the Sync Source/Sample Rate box. A flashing
LED indicates a requested state which could not be met. For example, if an external AES
reference was selected but no such ref sync input is detected by the ADA-8, it substitutes a
local clock reference automatically, lights the 'Local' LED and flashes the 'AES' LED.
© Prism Media Products Limited, 2002 Page 1.19