AT Command Manual for Sierra MC87XX Module

MC87xx Extended AT Command Reference
110 2130616
!AVTXVOL
=<profile>, <value>
!AVTXVOL?
<profile>
Supporting Mini Cards:
• MC8775V
• MC8785V
• MC8790V
• MC8791V
• MC8792V
Set the TX volume
This command sets / queries the TX volume gain for the specified audio
profile. The TX volume gain determines the gain, from -84
dB to +12 dB,
for the voice that is transmitted over the air. This gain is applied to the
PCM voice packets prior to feeding them into the vocoder, which
encodes the PCM packets into a more efficient format for over the air
transmission.
This setting is stored in non-volatile memory and persists across power
cycles. The change to the audio system takes effect when a phone call
is made or received.
Parameters:
<profile> (audio profile number)
• 0 = Handset
• 1 = Headset
• 2 = Car kit
• 3 = Speaker phone
• 4 = Auxiliary
• 5 = TTY
• (MC8785V / MC8790V / MC8791V / MC8792V only)
6 = Auxiliary external PCM (128 kHz clock)
• (MC8785V / MC8790V / MC8791V / MC8792V only)
7 = Primary external PCM (2 MHz clock)
<value> (TX volume gain)
• Valid range: 0x0000 (mute) – 0xFFFF
• Unity gain value is 0x4000
• Calculate the gain in dB using the formula:
Gain = 20 log
10
(<value> / 16384)
Note: In the command, <value> is in hexadecimal format. In the
formula, convert <value> to decimal format.
Table 7-4: Tone settings for AT!AVTONEPLAY command
<Value>
parameter
setting
Tone Description
0x00 SND_0 DTMF for 0 key
0x01 SND_1 DTMF for 1 key
0x02 SND_2 DTMF for 2 key
0x03 SND_3 DTMF for 3 key
0x04 SND_4 DTMF for 4 key
Table 7-3: Voice command details (Continued)
Command Description