Digital Voice Interface Application Note r0

LE866 DIGITAL VOICE INTERFACE APPLICATION NOTE 80471NT11521A Rev.0 • 2017-01-16 13 of 22
Reproduction forbidden without Telit Communications S.p.A. written authorization – All Rights Reserved
AT#DVIEXT
AT#DVIEXT command sets the module in Normal or Burst DVI Audio Format:
 In Normal DVI Audio Format the WAO signal defines the left and right audio channel.
 In Burst DVI Audio Format the WAO signal defines the beginning of the audio frame.
The following table shows the AT command parameters values.
Tab. 1: DVI Audio Format configuration via AT#DVIEXT command
NOTE:
The preferred setting for LE866 is AT#DVIEXT=1,1,1
Please avoid using #DVIEXT command when a call is active
AT#DVIEXT <config>,<samplerate>,<samplewidth>,<audiomode>,<edge>
DVI Audio
Format
(mode)
<config>
<samplerate>
<samplewidth>
<audiomode>
<edge>
Normal
(I2S)
1(factory
setting)
0: 8 [KHz]
sample rate
1: 16 [KHz]
sample rate
0: 8 bits per
sample
1: 16 bits per
sample
0: Mono Mode
0: data is
transmitted on
the falling edge
of the clock and
sampled on its
rising edge,
factory setting.
1: data is
transmitted on
the rising edge of
the clock and
sampled on its
falling edge.
Burst
(PCM)
0
0: 8 [KHz]
sample rate
factory
setting
1: 16 [KHz]
sample rate
0: 8 bits per
sample
1: 16 bit per
sample
0
don’t care if the
<edge> value is
1 or 0, data is
always
transmitted on
the rising edge of
the clock and
sampled on its
falling edge