Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 62)

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 56

7.4.3 BIT2CMP Utility

The BIT2CMP utility converts binary compressed voice files (*.bit) to ASCII

compressed voice files (*.cmp). The command syntax is shown in Figure

27.

This utility generates two different ASCII output files: one designed for hard

decision detection (1 bit/symbol, format type C0) and one designed for soft

decision detection (4 bits/symbol, format type C1). The vocoder

compressed voice frame contains 96 symbols. The ASCII output formats

are shown in Figure 28.

Figure 27: BIT2CMP Utility Command Syntax

bit2cmp [options] infile outfile

Where:

-nocmd disables printing of FAA20 control commands within output stream

-ctl filename Reads control file and uses controls to create output file

-c1 Selects C1 output format (default is C0 format)

-h Print help

-q Run in quite mode

-qb Disable banner printing only

Figure 28: ASCII Compressed Formats (C0 and C1)

C0MSSSSXX…XXEEEE

C1MSSSSYYYY…YYYYEEEE

Where:

M = Timing Mode (Always = 0 for test vectors)

SSSS = Sequence number (incrementing hexdata value)

X…X = Compressed Data (96 symbols x 0.25 char/symbol = 24 char)

Y…Y = Compressed Data (96 symbols x 1 char/symbol = 96 char)

EEEE = Checksum

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 108 109

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 62