Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 24

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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 18
Figure 4: VC20 Forced Configuration Items
VC20 Fixed Configuration Items (SW5=OFF)
> ADAPT = OFF
> FRAMESIZE NIB NORM = 192
> FRAMESIZE NIB TRUN = 192
> MIX AUD <- VOC (0x7FFF)
> MIX PCM -- OFF
> MIX VOC <- AUD (0x7FFF)
> MIX COM -- OFF
> MIX TON -- OFF
> ROUTE VOC <- NIB
> ROUTE NIB <- VOC
> ROUTE COM <- COM
VC20 Fixed Configuration Items (SW5=ON)
> ADAPT = OFF
> FRAMESIZE NIB NORM = 192
> FRAMESIZE NIB TRUN = 192
> MIX AUD -- OFF
> MIX PCM <- VOC (0x7FFF)
> MIX VOC <- PCM (0x7FFF)
> MIX COM -- OFF
> MIX TON -- OFF
> ROUTE VOC <- NIB
> ROUTE NIB <- VOC
> ROUTE COM <- COM
5.1.3 DEMO Mode
The DEMO mode is designed to allow the FAA20 to operate in a
standalone mode. The AUD port is with the vocoder and the compressed
voice packets are internally looped. The software monitors the state of the
TMRX signal to enter and exit truncated timing mode. Figure 5 provides a
summary of the DEMO forced configuration parameters.
Figure 5: DEMO Forced Configuration Items
> MIX AUD <- VOC (0x7FFF)
> MIX PCM -- OFF
> MIX VOC <- AUD (0x7FFF)
> MIX COM -- OFF
> MIX TON -- OFF
> ROUTE VOC <- VOC
> ROUTE NIB <- NIB
> ROUTE COM <- COM
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