Digital Voice Systems VC-20-ATC-10B Specifikace stáhnout pdf (Strana 95)

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 89

8.3.24 MIX

The MIX command controls the routing and amplitude level of linear audio

signals. The mixer only supports unity and negative gain adjustments, i.e.

attenuation and mute.

Table 35: MIX Command Syntax

ATTRIBUTE DESCRIPTION

SYNTAX MIX [lintx [linrx [xamp]]]

lintx

linrx

Linear Mixer Port: The lintx is the mixer output port, and the

linrx is the mixer input port

AUD = Audio Port

PCM = Digital Data Port

VOC = Vocoder Port

COM = COM Port

TON = Tone Generator Port

OFF = OFF

Note: The selection of TON for LINTX has no practical effect,

since this port is only an input.

PARAMETERS

xamp Amplitude: The amplitude in Q1.15 hex data format. Valid

range: 0 to 7FFF (hex). Sets the amplitude of the linrx port

signal to mix into the lintx output port. Unity gain is 0x7FFF.

A gain factor of 0.5 (or -6 dB power adjustment) is 0x3FFF.

FLASH YES for all modes EXCEPT the DEMO mode.

Print current mixer settings (default settings shown).

COM1: mix

> MIX AUD <- VOC (0x7FFF)

> MIX PCM <- VOC (0x7FFF)

> MIX VOC <- AUD (0x7FFF)

> MIX VOC <- PCM (0x7FFF)

> MIX COM -- OFF

> MIX TON – OFF

Disable all mixer routing paths.

COM1: mix off

> MIX AUD -- OFF

> MIX PCM -- OFF

> MIX VOC -- OFF

> MIX COM -- OFF

> MIX TON -- OFF

EXAMPLES

Route the tone generator output to the AUD output port (at 0 dBm0)

COM1: mix aud ton 5a9d

> MIX AUD <- TON (0x5A9D)

For more information, see Section 5.3.2.

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