參數(shù)資料
型號: KS16114
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: 9600/14400 bps FAX MODEM
中文描述: 14400分之9600基點傳真調制解調器
文件頁數(shù): 49/69頁
文件大?。?/td> 513K
代理商: KS16114
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
相關PDF資料
PDF描述
KS16112 CAP 33PF 50V 5% NPO(C0G) SMD-0603 TR-7-PA
KS16116-02 9600 bps FAX MODEM(9600bps傳真調制解調器)
KS16117-02 14400 bps FAX MODEM(14400bps傳真調制解調器)
KS16118 9600bps FAX super one-chip(9600bps傳真調制解調器)
KS16120B DSP for Digital Answering Phone(用于數(shù)字應答電話的DSP)
相關代理商/技術參數(shù)
參數(shù)描述
KS16-14 制造商:MAJOR 功能描述:
KS-16287L1 制造商:WSTELC 功能描述:
KS-16287L2 制造商:WSTELC 功能描述:
KS16390 制造商: 功能描述: 制造商:Cornell Dubilier Electronics 功能描述: 制造商:undefined 功能描述:
KS16479 制造商:Olympic Controls Corporation 功能描述: