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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 100

8.3.34 VOC

The VOC command sets/gets vocoder parameters. Generally, these

parameters are used for vocoder testing; however, the FEC counter may be

useful during operation to assess the performance of the communication

channel. Table 46 provides brief VOC parameter descriptions. Refer to

DVSI vocoder software documentation for additional details.

Table 45: VOC Command Syntax

ATTRIBUTE DESCRIPTION

SYNTAX VOC [param [tmode [rate]]]

param PCM Selects the PCM interface

NIB Selects the NIB interface

tmode NORM Selects normal timing m ode

TRUN Selects truncated timing mode

PARAMETERS

rate Desired clock rate (Hz) entered as a decimal integer.

FLASH YES

Print current vocoder parameter settings.

COM1: voc

> VOC EMODE = 0x0000

> VOC DMODE = 0x0000

> VOC FEC = 5

> VOC EWS0 = 80

> VOC EWS1 = 80

> VOC DWS0 = 80

> VOC DWS1 = 80

> VOC MUTE = 0

> VOC LOST = 0

> VOC DTX = 0

> VOC SDBITS = 1

Clear the FEC error counter.

COM1: voc fec 0

> VOC FEC = 0

EXAMPLES

Change NIB clock rate settings for the truncated timing mode.

COM1: clkrate nib trun 8000

> CLKRATE NIB TRUN = 8000

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Digital Voice Systems VC-20-ATC-10B Spezifikationen Seite 106