Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 36)

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 30

Figure 14: Vocoder RUN Signal and Voice Delays

Note: Encode and Decode delays shown above are reported by the DELAY command. The delays DO

NOT include collection delay (20 ms) and/or algorithm delay (60 ms).

Table 6: Typical Delay Values*

LED TYPICAL VALUE DESCRIPTION

2.6 ms Transmission Delay. For normal timing and 9600 Hz

clock rate.

7.5 ms Encoder Processing Delay. This is an allocated

maximum delay. It includes processing delay of higher

priority tasks, i.e. interrupts.

5.0 ms Decoder Processing Delay. This is an allocated

maximum delay. It includes processing delay of higher

priority tasks, i.e. interrupts. This delay assumes no

task overlap.

1.5 ms – 2.0 ms Queue Delay. This is a measured delay. The queue

depths are read at the task trigger point.

* Normal timing mode delays are shown. Truncated timing mode delays are similar.

FMEN

Overlapping tasks extend the decoder processing delay

Encoder

FMDE

Decoder

Delay

Encode Delay*

Decode Delay*

RUN

20 ms (nominal)

FMEN

Encoder

FMDE

Dec

RUN

Dec

Decode Delay*

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 108 109

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 36