Telit Wireless Solutions LE910 User Manual

Telit LE910 V2 Series AT Commands
80446ST10707A Rev. 0– 2015-11-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 460 of 509
Mod. 0808 2011-07 Rev.2
Cascaded filters - #BIQUADOUT
#BIQUADOUT - Downlink Path Biquad Filters
SELINT 2
AT# BIQUADOUT=
<a
F0
>
[,<a
F1
>
[,<a
F2
>
[,<b
F1
>
[,<b
F2
>
[,<a
S0
>
[,<a
S1
>
[,<a
S2
>
[,<b
S1
>
[,<b
S2
>
]]]]]]]]]
Set command allows to configure the parameters of the two cascaded digital
biquad filters in Downlink path (receiving). It is not allowed
if active audio profile is 0.
Parameters:
<a
Fn
>,<b
Fn
>,<a
Sn
>,<b
Sn
> - they all are specific parameters for the calculation of
digital biquad filters as follows:
-32768..32767 - each value has to be interpreted as signed fixed point number in
two’s complement format with 15 fractional bits in a 16 bit word
(Q15)
Note: in the above formulas pay attention to the multiplier (2) for parameters <a
F1
>,
<a
S1
>, <b
F1
> and <b
S1
>
Parameters can be saved in NVM using AT#PSAV command and are available for
audio profiles 1,2,3. For audio profile 0 the values are fixed.
AT# BIQUADOUT?
Read command returns the parameters for the active profile in the format:
# BIQUADOUT: <a
F0
>,<a
F1
>,<a
F2
>,<b
F1
>,<b
F2
>,<a
S0
>,<a
S1
>,<
S2
>,<b
S1
>,<b
S2
>
It is not allowed if active audio profile is 0.
AT# BIQUADOUT=?
Test command returns the supported range of values for parameters <a
F0
>, <a
F1
>,
<a
F2
>, <b
F1
>, <b
F2
>, <a
S0
>, <a
S1
>, <a
S2
>, <b
S1
>, <b
S2
>
)
()( z
HzH
SecondFirst
⋅
2
2
1
1
2
2
1
10
21
2
)(
−
−
−
−
⋅
+
⋅⋅
+
⋅+
⋅
⋅+
=
z
bz
b
z
a
za
a
zH
FF
FF
F
F
2
2
1
1
2
2
1
1
0
2
1
2
)(
−−
−−
⋅+
⋅⋅+
⋅
+⋅
⋅
+
=
z
bzb
z
a
za
a
z
H
SS
S
SS
S

Telit Wireless Solutions LE910 Specifications

General

Brand	Telit Wireless Solutions
Model	LE910
Category	Control Unit
Language	English