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參數資料
| 型號： | HT9015 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | RF Single Chip for Cordless Phone |
| 中文描述： | 射頻單芯片無繩電話 |
| 文件頁數： | 18/23頁 |
| 文件大小： | 206K |
| 代理商： | HT9015 |
HT9015
18
April 10, 2000
Preliminary
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Figure 9 Illustration of compressed and extended signal
Compander
The compander (compressor and expander) is
composed of two variable gain circuits which
provide compression and expansion of the sig-
nal dynamic range. In consideration of the wide
band noise and maximum dynamic range
which exist in the transmission medium, the
general signal handling technique lowers the
general communication quality by reducing the
S/N ratio and generating a clipping phenome-
non. However the compander improves the
communication quality by automatically con-
trolling the gain based on the input signal level
to increase the valid dynamic range and to im-
prove the S/N ratio.
In the HT9015, the compressor will take a sig-
nal with a 75dB dynamic range ( 5dB to
80dB), and reduce it to a 37.5dB dynamic
range ( 7.5dB to 45dB) by attenuating strong
signals,while amplifying low level signals. The
expander does the opposite in that the 37.5dB
signal range is increased to a dynamic range of
75dB by amplifying strong signals and attenu-
ating low level signals. The 0dB level is inter-
nally set at 316.227mVrms
level which is neither amplified nor attenuated.
See Figure 9 below. Through the action of the
compander, the noise of the transmission me-
dium is constant under 80dBV.
that is the signal
相關PDF資料 |
PDF描述 |
|---|---|
| HT9020B | Call Progress Tone Detector |
| HT9020 | Call Progress Tone Decoder & ABR Controller |
| HT9020A | Call Progress Tone Decoder & ABR Controller |
| HT9032 | Calling Line Identification Receiver |
| HT9033 | CAS Tone Detector |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT9020 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
| 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 |
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