Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 107)

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 101

Table 46: VOC Command Parameters

PARAMETER DESCRIPTION

EMODE Encoder Control Word (hex). This control word is a calling parameter

cmode for the vocoder encoder function. Refer to DVSI documentation

for details.

DMODE Decoder Control Word (hex). This control word is a calling parameter

cmode for the vocoder decoder function. Refer to DVSI documentation

for details.

FEC Forward Error Correction Error Counter (decimal). Each tim e the FEC

decoder function is called, the FAA20 software adds returned errors to

this accumulating error counter.

EWS0 Encoder Sub-Frame #0 Window Size (decimal). The valid value is 79

to 81 samples with 80 samples being the nominal value. The

equivalent DVSI function calling parameter is ws.

EWS1 Encoder Sub-Frame #1 Window Size (decimal). The valid value is 79

to 81 samples with 80 samples being the nominal value. The

equivalent DVSI function calling parameter is ws.

DWS0 Decoder Sub-Frame #0 Window Size (decimal). The valid value is 79

to 81 samples with 80 samples being the nominal value. The

equivalent DVSI function calling parameter is ws.

DWS1 Decoder Sub-Frame #1 Window Size (decimal). The valid value is 79

to 81 samples with 80 samples being the nominal value. The

equivalent DVSI function calling parameter is ws.

MUTE Decoder Mute Control. Valid values are 0 and 1. This bit corresponds

to bit #3 of the DMODE word. Normally, this bit is controlled by the

control nibble; however, when the TEST BITEXACT mode is set, this bit

can be controlled by the VOC command.

LOST Decoder Lost Control. Valid values are 0 and 1. This bit corresponds to

bit #2 of the DMODE word. Normally, this bit is controlled by the control

nibble; however, when the TEST BITEXACT mode is set, this bit can be

controlled by the VOC command.

DTX Encoder Discontinuous Transmission Control. Valid values are 0 and 1.

This bit corresponds to bit #4 of the DMODE word. Nominally this bit is

controlled by the VAD signal conductor; however, when the operational

mode is set to TEST, this bit can be controlled by this command. Note:

This soft control bit is stored as a flash configuration parameter.

SDBITS Soft Detection Bit Quantity. The default setting is hard detection

(SDBITS=1). The valid range is 1 to 4 bits. The sizes 2 through 4 are

ONLY used during vocoder bit exactness testing, i.e. when the

BITEXACT is set. When this testing is conducted, the C1FMT option

(long compressed voice format) should be enabled.

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