參數(shù)資料
型號： Z0220516SSC1961
英文描述： Modem Controller
中文描述： 調(diào)制解調(diào)器控制器
文件頁數(shù)： 34/48頁
文件大?。?/td> 1331K
代理商： Z0220516SSC1961
Z02201
V.22bis Data Pump with Integrated AFE
ZiLOG
34
Z02201
PS000902-0501
Figure 10. Tone Detectors
CALL-PROGRESS MONITORING USING BIQUAD TONE DETECTORS
The data pump contains two biquad tone detectors that are
capable of detecting energy in a frequency band. These
detectors are useful for call-progress monitoring, where the
exact frequency of the incoming signal is not known. Each
biquad tone detector is composed of two cascaded,
independently programmable, biquad sections. The order
of biquad coefficients in RAM is:
b2, b1, a3, a2, a1, B2, B1, A3, A2, A1
The addresses for the coefficients for the two sections start
at
0155H
(
TONEA
) and
015FH
(
TONEB
). The sample rate
is 9600 Hz.
The transfer equation for each section of the biquad tone
detector is of the form:
2 a
1
a
2
Z
+
1
2b
1
Z
–
(
There are two threshold settings affecting both biquad tone
detectors. The locations
BIQUADOFFTHRESH
and
BIQUADONTHRESH
define the on and off hysteresis
points where level is in dBm:
1.
BIQUADOFFTHRESH
–
052H
–OFF point.
2.
BIQUADONTHRESH
–
051H
–ON point.
Use the following formula to set the thresholds:
The default values are –35 dBm (BiQuadOnThresh) and
–42dBm (BiQuadOffThresh).
The biquad tone detector status is contained in
TONESTATUS
, bit
15
(
TONEA
) and
TONESTATUS
, bit
14
(
TONEB
). The response time of the biquad tone
detectors depends on the coefficients and the input signal
frequency.
The biquad tone detectors can be cascaded to form one tone
detector with 4 biquad sections (an 8th order IIR filter) by
setting ToneStatus.CASCADE. In this case,
Level 0
Tone 0
Tone 15
Level 15
Tone Detector Levels
(026H
–
035H)
Threshold (03H)
Comparator
Tone Detector Status
(00H)
Tone Detector
Coefficients
(0145H
–
0154H)
H
n
1
–
a
Z
2b
2
Z
2
–
+
)
–
)
----------------------------------------------------------
=
Threshold
10
level
(
)
20
32767
=
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