
FAA20 Embedded NEXCOM Vocoder
Board Manual
This manual has been prepared for the Federal Aviation Administration.
FA100-00107 (March 2004) – Rev 1.0.0 Page 76
Counters are provided for sample add/drop events, packet add/drop events,
and the number of items written to queues. The counters are especially
helpful for diagnosing improper timing setups. When interface timing
relationships are not exact, voice samples can be added or dropped. For
example, if the PCM interface is used with the vocoder and the relative
timing between the PCM data interface and NIB data interface isn’t
maintained voice samples are added/dropped can be added the linear
LVOCTX and/or LVOCRX queues. Samples and packets may
added/dropped during FAA20 power up.
The NRDY field indicates the depth of the queue measured when the
vocoder frame sync signals are detected. This is used to update vocoder
delay measurements (see DELAY command).
For more information on queues, see Section 6.2.3.
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