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參數資料
| 型號： | HT9020 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Call Progress Tone Decoder & ABR Controller |
| 中文描述： | 呼叫進展音解碼器 |
| 文件頁數： | 7/12頁 |
| 文件大小： | 477K |
| 代理商： | HT9020 |
Functional Description
Decoder
The HT9020 call progress tone decoder (DE C/ABRC=V
DD
) can be used in the U.S.A. and many other
countries in the world. The signal format, truth table and timing of the decoder are shown below.
The signal format of the call progress tone
T one
F requency
Condition
Precision Dial Tone
350Hz + 440Hz
Continuous
Old Dial Tone
120Hz(or 133Hz, ..) + 600Hz
Continuous
Precision Busy Tone
480Hz + 620Hz
0.5sec On and 0.5sec Off
Old Busy Tone
120Hz + 600Hz
0.5sec On and 0.5sec Off
Precision Reorder Tone
480Hz + 620Hz
0.3sec On and 0.2sec Off
Old Reorder Tone
120Hz + 600Hz
0.2sec On and 0.3sec Off or 0.25sec
On and 0.25sec Off
Precision Ring-back Tone
440Hz + 480Hz
2sec On and 4sec Off
Old Ring-back Tone
40Hz (or the others) + 420Hz
2sec On and 4sec Off
The truth table of the decoder
Tone
Transition No.
DIAL
R BK
BUSY
DV
OE /HK OF F
Initial
—
0
0
0
0
0
Dial
1
1
0
0
1
0
Ringback
2~4
0
1
0
1
0
Busy/Reorder
5~16
0
0
1
1
0
Overflow
over 16
0
0
0
1
0
Output Disable
—
Hi-Z
Hi-Z
Hi-Z
*
1
Notes: Hi-Z: Hi impedance
*: previous state
HT9020
7
21st Aug ’98
相關PDF資料 |
PDF描述 |
|---|---|
| HT9020A | Call Progress Tone Decoder & ABR Controller |
| HT9032 | Calling Line Identification Receiver |
| HT9033 | CAS Tone Detector |
| HT9170 | DTMF Receiver |
| HT9170B | DTMF Receiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT9020A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
| HT9020A(18DIP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Metering/Monitoring Circuit |
| HT9020A(18SOIC) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Metering/Monitoring Circuit |
| HT9020B | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
| HT9030 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Calling line identification receiver |
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