Rohde & Schwarz CMU-K20, Operating Manual

Page: 529 / 646

CMU-K20/21/22/23/24 Options and Extensions
1115.6088.12 6.225 E-12
CONFigure:NETWork[:CSWitched]:AMR:HRATe:RSETting
AMR Rate Set, Half Rate
<CM4>, <CM3>, CM2>, <CM1>,
<ThrDown4>, <ThrUp3>, <ThrDown3>, <ThrUp2>, <ThrDown2>, <ThrUp1>
<CM4>, <CM3>, <CM2>, CM1>
Description of parameters Def. value Def. unit FW vers.
C1220 | C1020 | C0795 |
C0740 | C0670 | C0590 |
C0515 | C0475 |
OFF
User bit rate for codec modes 4 to 1.
Mode switched off C0795,
C0670,
C0590,
C0515, –
<ThrDown4>
Description of parameters Def. value Def. unit
0.0 dB to 31.5 dB
(in 0.5 dB steps)
Lower decision threshold for switching
between modes 4 and 3 15.0, dB
<ThrUp3>
Description of parameters Def. value Def. unit
0.0 dB to 31.5 dB
(in 0.5 dB steps)
Upper decision threshold for switching
between modes 3 and 4 17.0, dB
<ThrDown3>
Description of parameters Def. value Def. unit
0.0 dB to 31.5 dB
(in 0.5 dB steps)
Lower decision threshold for switching
between modes 3 and 2 12.5, dB
<ThrUp2>
Description of parameters Def. value Def. unit
0.0 dB to 31.5 dB
(in 0.5 dB steps)
Upper decision threshold for switching
between modes 2 and 3 15.0, dB
<ThrDown2>
Description of parameters Def. value Def. unit
0.0 dB to 31.5 dB
(in 0.5 dB steps)
Lower decision threshold for switching
between modes 2 and 1 11.0, dB
<ThrUp1>
Description of parameters Def. value Def. unit FW vers.
0.0 dB to 31.5 dB
(in 0.5 dB steps)
Upper decision threshold for switching
between modes 1 and 2 13.0 dB V3.40
Description of command Sig. State
These commands select four codec modes and define the decision thresholds for changing the codec
mode. The settings are valid for Half Rate AMR speech coder tests; see command
CONFigure:NETWork[:CSWitched]:SMODe:TRAFfic
on p. 6.197 . The instrument rejects the
settings (SCPI error –221, Settings conflict) unless the values meet all of the following conditions:
•
The rates must be in descending order so that <CM4> is the largest bit rate.
•
Up to 3 codec modes can be switched off. OFF must be the first values of the parameter list,
preceding the used codec modes.
•
Thresholds must be in descending order so that <ThrDown2> ≤ <ThrDown3> ≤ <ThrDown4> and
<ThrUp1> ≤ <ThrUp2> ≤ <ThrUp3>.
•
The hysteresis must be positive so that Up (j)
≥
Down (j + 1) for j= 1 to 3
To query the DL codec mode requested by the MS use
[SENSe:]MSSinfo:AMR:HRATe:DLCMode?
and
[SENSe:]MSSinfo:AMR:FRATe:DLCMode?
(see p. 6.209 ).
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