Vsm - Compression Method Selection - Conexant H08-15355F Reference Manual

5.2.2.13 +VSM - Compression Method Selection

This command causes the modem to set the voice compression method, the silence compression sensitivity, and the voice
sampling rate.
Syntax
+VSM=<cml>,<vsr>,<sds>,<sel>
Defined Values
<cml> Decimal number identifying the compression method.
<vsr> <range of values> containing the supported range of voice samples per second of the analog signal.
<scs> <range of values> containing the supported range of sensitivity settings for voice receives.
<sel> <range of values> containing the supported range of expansion values for voice transmits.
Reporting Current or Selected Values
Command: +VSM?
Response: +VSM: <cml>,<vsr>,<sds>, <sel>
Example: +VSM: 130,UNSIGNED PCM,8,0,127,0
Reporting Supported Range of Parameter Values
Command: +VSM=?
Response: +VSM: <cml>, <cmid>, <bps>, <tm>,<vsr>,<sds>, <sel>
<cml> Decimal number identifying the compression method (1, 128 to 133).
<cmid> Alphanumeric string describing the compression method (UNSIGNED PCM, 8-BIT LINEAR, ADPCM,
ULAW, ALAW, or LINEAR).
<bps> Decimal number defining the average number of bits in the compressed sample not including silence
compression (4, 8, or 16).
<tm> Decimal number (0) reporting the time interval, in units of 0.1 second, between timing marks. A value
of 0 reports that timing marks are not supported.
<vsr> <range of values> containing the supported range of voice samples per second of the analog signal
(7200 or 8000).
<scs> <range of values> containing the supported range of sensitivity settings for voice receives (0).
<sel> <range of values> containing the supported range of expansion values for voice transmits (0).
Example:
AT+VSM=?
1,"UNSIGNED PCM",8,0,(7200,8000),(0),(0)
128,"8-BIT LINEAR",8,0,(7200,8000),(0),(0)
129,"ADPCM",4,0,(7200,8000),(0),(0)
130,"UNSIGNED PCM",8,0,(7200,8000),(0),(0)
131,"ULAW",8,0,(7200,8000),(0),(0)
132,"ALAW",8,0,(7200,8000),(0),(0)
133,"LINEAR",16,0,(7200,8000),(0),(0)
Result Codes
OK Valid range.
ERROR Otherwise, or if not in Voice Mode.
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Command Reference Manual
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