Synaccess Networks NP-0801DTM - Manual (Page 323)

AUDIO COMMANDS
323 HSPA+ AT Commands Reference Guide
Miscellaneous Audio Commands
PCM Play and Receive #SPCM
Execute command allows user either to send speech sample coming from microphone and/or downlink audio
channel to serial port, or to reproduce a PCM coming from serial port to speaker and/or uplink audio channel;
both modes are also available during speech calls.
Test command returns the supported range of values for <mode> and <dir>.
#SPCM: <mode>,<dir>
Syntax
Command Command type
AT#SPCM=<mode>[,dir,[format]] Execute
AT#SPCM=? Test
Parameters and Values
<mode> Action to execute.
1 Reproduce PCM stream from serial to selected path.
2 Send speech from selected path to serial.
<dir> Select the audio path.
0 Send/receive to/from analog front end.
1 Send/receive to/from audio channel.
2 Reserved.
<format> PCM bits format.
0 8 bit.
1 16 bit.
Notes
„
Execute command switches module in online mode. Module moves back to command mode either afer entering
the escape sequence +++ or as a consequence of a DTR transition.
„
If you are using 16 bit, you must set +IPR at least to 230400.
The following table summarizes the status of audio path during a speech call for different configurations and with
sidetone disabled:
mode = 1 mode = 2
dir = 0 Uplink off. Downlink on.
PCM stream on speaker. Uplink off. Downlink off.
PCM stream from microphone.
dir = 1 Uplink on. Downlink off.
PCM stream on uplink. Uplink off. Downlink off.
PCM stream from downlink.
Sidetone is active for default.