Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 89)

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 83

8.3.18 GAM

The GAM command sets/gets the gain, attenuation and mute

characteristics for linear voice ports. Presently, the FAA20 only supports

GAM adjustment on the analog audio (AUD) interface. This command

allows the audio interface to be level-adjusted to match external analog

audio equipment and still comply with vocoder audio level requirements.

Table 29: FRAMESIZE Command Syntax

ATTRIBUTE DESCRIPTION

SYNTAX GAM [interface [dir [gvalue]]]

interface PCM Selects the PCM interface

NIB Selects the NIB interface

tmode NORM Selects normal timing mode

TRUN Selects truncated timing mode

PARAMETERS

gvalue Gain value entered as a Q3.12 format hexadecimal value.

Valid range is 0x0000 to 0x7FFF. For example, a unity gain

(0 dB power adjustment) is represented by the value

0x1000. A +3 dB power adjustment is represented by the

value 0x2000. A -3dB power adjustment is represented by

the value 0x0800. The full range supports power

adjustments from -36 dB to +21 dB.

FLASH YES

Print current GAM settings (default settings shown).

COM1: gam

> GAM AUD TX = 0x1000

> GAM AUD RX = 0x1000

EXAMPLES

Change audio transmit GAM settings.

COM1: gam aud tx 2000

> GAM AUD TX = 0x2000

Note: Do not enter any leading ‘0x’ characters.

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 89