SI2493-D-FS Silicon Laboratories Inc, SI2493-D-FS Datasheet - Page 202

• Manufacturer Part Number: SI2493-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-D-FS

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AN93
7.6.2.1. Record OGM
The Si3000-to-RS232 gain register UC0 in the ISOmodem can be used to adjust the voice stream gain. Use the
+VGR command to adjust the UC0 value in command mode. It is best to maintain two versions of +VGR: one for
Si3000-to-RS232 and another for DAA-to-RS232.
202
Host to Modem Commands /
AT+VTS=[1000,0,100]
AT:U199&FFFD
AT:U199&FFF7
AT:U0B1,0500
AT+VGR=128
AT+VSD=129
AT+VSM=4
AT:U0B1,0
AT:U199|8
<DLE><!>
AT:U199|2
AT+VRX
Data
Modem to Host Result
Table 127. TAM Hands-Free Record OGM
[Voice Stream]
<DLE><ETX>
Codes/Data
CONNECT
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Rev. 1.3
Set the Si3000-to-RS232 receive gain (UC0) for TAM
Hands-Free.
Restore Si3000-to-DAA transmit gain path to allow
voice samples to reach FDV block for silence detection.
This allows the driver to automatically end OGM
recording.
Set sensitivity level for OGM recording silence detec-
tion.
Select G.711U -law PCM, 8-bit, 64 kbps format. The
voice driver will need to track the OGM format with the
OGM PCM file.
Play user record tone prompt.
Mute speaker to avoid echo (speakerphone algorithm
off).
Enable microphone for OGM recording.
Trigger receive operation. The first byte after the new-
line character following the CONNECT message will be
the first data stream byte.
Receive OGM voice stream. During voice stream cap-
ture, the user can adjust the UC0 value via the
<DLE><u> and <DLE><d> commands. The host voice
driver will need track the number of adjustments and
update the +VGR value for future use.
Terminate the receive operation. The modem will
respond with <DLE><ETX> to mark the end of the data
stream. The OK denotes the return to command mode.
Disable Si3000-to-DAA transmit gain path. This
ensures codec tones are not sent to the FDV and
DTMF.
Mute the microphone.
Enable speaker for local ring tone/alert tones.
Local Modem Actions