Digital Voice Interface Application Note r0

LE866 DIGITAL VOICE INTERFACE APPLICATION NOTE 80471NT11521A Rev.0 • 2017-01-16 10 of 22

3 DVI OVERVIEW

Before dealing with the configuration and technical aspects of the Telit’s Digital Voice Interface (DVI) it

is useful to illustrate briefly how this interface can be used, refer to fig. 1.

The voice coming from the downlink, in digital format, is captured by the dedicated software running

on the Telit’s module and directed to the Digital Voice Interface. The Audio Codec decodes the voice

and sends it to the speaker. The voice captured by the microphone is coded by the Audio Codec and

directed through the Digital Voice Interface to the module that collects the received voice, in digital

format, and sends it on the uplink.

fig. 1: Example of Digital Voice Interface Use

NOTE:

The Digital Voice Interface supports the Echo canceller functionality, which is

beyond the scope of the present document. Refer to the AT Commands

specification for the specific AT commands.

Audio Codec

Telit

Module

Digital Voice Interface

Uplink

Downlink