Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 76)

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76 Rev. 1.3
+VSM = n Voice Compression Method.
0 Signed PCM
1 Unsigned PCM
4 G.711 µ-Law
5 G.711 A-Law
129 ADPCM 2-bit (2 kB/s storage)
131 ADPCM 4-bit (4 kB/s storage)
+VSP Voice Speakerphone State
<mode> Description
0 Speakerphone AEC, AES and LEC disabled.
Handset FIR filter coefficients are selected.
1 Speakerphone AEC, AES and LEC enabled.
Speakerphone FIR filter coefficients are selected.
The +VLS=13 command must be used in combination with this
setting.
+VTD = n DTMF / Tone Duration Timer .
This command sets the default DTMF / tone generation duration in
10 ms units for the +VTS command. Default time is 1 second
(n = 100).
+VTS = [<freq
1>, <freq2>,
<dur>] DTMF and Tone Generation.
This command can be used to produce DTMF tones, single-fre-
quency tones, and double-frequency tones. Note that the bracket
characters are required for correct operation.
<freq1>
Frequency one, which has a range of 0, 200-
3200 Hz.
<freq2>
Frequency two, which has a range of 0, 200-
3200 Hz.
<dur>
Duration of the tone(s) in 10 ms units.
+VTX Transmit Voice Samples.
Used for sending digitized voice samples from host memory
through the UART interface. The +VSM command determines the
format of the samples. Multiple routing options are available.
Table 39. Basic AT Command Set (Continued)
Command Action