Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 59)

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 53

7.4 Vocoder Test Vector Support

Test vectors are used to insure proper vocoder integration. The vectors

include linear and compressed voice files that are sent through the AMBE

encoder and decoder, respectively. The test vector set also includes a few

vocoder control files that are used to assert controls (e.g. mute, lost, data

window sizes) during test vector execution.

The FAA20 serial interface is designed to work with ASCII commands and

data streams. The binary voice test vector files must be converted to an

ASCII format compatible with the FAA20. There are two MS-DOS style

utilities that perform the conversion.

• DAT2LIN Utility. This utility creates ASCII formatted linear voice

files.

• BIT2CMP Utility. This utility creates ASCII formatted compressed

voice files.

Both of these utilities support an option to include a vocoder control file. If a

control file is specified, the utility will interleave FAA20 vocoder setup

commands with the voice data at specified data frame boundaries. The

utilities are designed to accept DVSI-provided ASCII control files (e.g.

lost.ctl). The FAA20 CDROM includes these utilities as well as a batch file

is used to translate all of the necessary vector files.

This section provides the test vector execution procedure and details for the

two MS-DOS utilities.

7.4.1 Test Vector Execution

The FAA20 supports test vector input/output via two RS-232 serial ports.

The test vector execution involves sending an input test vector files into one

serial port of the FAA20 and capturing the converted vector output data at

the other serial port. All output files are compared to insure they are

identical to ones supplied on DVSI software distribution CDROM. Figure 24

shows a typical test vector setup which uses a multi-port serial adapter.

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 59