參數(shù)資料
型號: KS16112
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: CAP 33PF 50V 5% NPO(C0G) SMD-0603 TR-7-PA
中文描述: 14400分之9600基點傳真調(diào)制解調(diào)器
文件頁數(shù): 49/69頁
文件大小: 513K
代理商: KS16112
KS16112/4
9600/14400 bps FAX MODEM
-
49
-
2 Tone Detection
2.1 Programmable Tone Detection
The modem includes three programmable independent tone detectors ( called TD1, TD2, and TD3 ). All three
tone detectors are operational when the modem is in a non - high speed mode. In the high speed mode
only tone detector TD3 is operational. The default center frequencies for the tone detectors are 2100 Hz
( TD1 ), 1100Hz ( TD2 ), and 462 Hz ( TD3 ). The three tone detectors can be cascaded to form a single
12th order filter by setting the CASC bit in the dual port interface memory.
Each tone detector consists of two second order filters with two zeros and two poles each, a first order
energy averaging filter and a threshold comparator. A block diagram of a tone detector is shown in
Figure 2.
Filter 1 has a transfer function :
2 ( a0 + a1z
-1
+a2z
-2
)
1 + 2b1z
-1
+ 2b2z
-2
H1
(
Z
) =
2 ( a
0
+ a
1
z
-1
+a
2
z
-2
)
1 + 2b
1
z
-1
+ 2b
2
z
-2
H2
(
Z
) =
Filter 2 has transfer function :
The energy averaging filter has a transfer function :
a
1 - b
z
-1
H3
(
Z
) =
a1
a2
a0
b1
b2
a
1
a
2
a
0
b
1
b
2
a”
b”
output
input
Figure 2. Tone Detector Block Diagram
ABS
THRESHOLD
COMPARATOR
2
Z
-1
Z
-1
M
x
2
M
Z
-1
Z
-1
M
M
x
Z
-1
M
x
x
x
x
x
x
M
x
x
M
x
x
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