JPS63158034U - - Google Patents
Info
- Publication number
- JPS63158034U JPS63158034U JP1987050653U JP5065387U JPS63158034U JP S63158034 U JPS63158034 U JP S63158034U JP 1987050653 U JP1987050653 U JP 1987050653U JP 5065387 U JP5065387 U JP 5065387U JP S63158034 U JPS63158034 U JP S63158034U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- received signal
- modulation
- bandpass filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
第１図は本考案の実施例に係る変復調装置のブ
ロツク図、第２図は市内回線区間で一般に発生す
る振幅特性（√特性）を示す図、第３図および
第４図は振幅特性を測定する場合の周波数掃引特
性を示す図である。
３，３′……復調回路、４，４′……変調回路
、５，５′……レベル測定回路、６，６′，７，
７′……バンドパスフイルタ回路、８，８′……
バンドエリミネータフイルタ回路、９，９′……
可変利得増幅回路、１０，１０′……可変周波数
発振回路、１１，１１′……信号選択回路、１３
，１３′……制御部、１４，１４′……復調出力
信号、１５，１５′……変調入力信号、１６，１
６′……プリセツト開始要求信号、１７，１７′
……可変振幅等化器、２０，２１……受信側およ
び送信側変復調装置。
Figure 1 is a block diagram of a modulation/demodulation device according to an embodiment of the present invention, Figure 2 is a diagram showing amplitude characteristics (√ characteristics) that generally occur in a local line section, and Figures 3 and 4 are diagrams showing amplitude characteristics. It is a figure which shows the frequency sweep characteristic when measuring. 3, 3'... Demodulation circuit, 4, 4'... Modulation circuit, 5, 5'... Level measurement circuit, 6, 6', 7,
7'... Band pass filter circuit, 8, 8'...
Band eliminator filter circuit, 9, 9'...
Variable gain amplifier circuit, 10, 10'... Variable frequency oscillation circuit, 11, 11'... Signal selection circuit, 13
, 13'...Control unit, 14,14'...Demodulated output signal, 15,15'...Modulated input signal, 16,1
6'...Preset start request signal, 17, 17'
. . . variable amplitude equalizer, 20, 21 . . . receiving side and transmitting side modulation/demodulation equipment.
Claims (1)
回路、これら各回路の出力を選択して出力する送
信部およぶ受信信号レベル測定回路、可変振幅等
化回路、前記可変振幅等化回路の出力を入力とす
る復調回路および前記受信信号レベル測定回路の
出力を入力とし前記可変振幅等化回路、受信信号
増幅回路、可変周波数発振回路、および送信選択
回路を制御する制御回路を有する変復調装置にお
いて、受信信号を第１のバンドパスフイルタ回路
、第２のバンドパスフイルタ回路および前記第１
、第２のバンドパスフイルタ回路の通過帯域を抑
圧したバンドエリミネータフイルタでモニタし各
々の出力を入力し、制御部へ出力する信号検出部
を有することを特徴とする変復調装置。 A modulation circuit, a variable frequency oscillation circuit, a received signal amplification circuit, a transmitter that selects and outputs the output of each of these circuits, a received signal level measurement circuit, a variable amplitude equalization circuit, and the output of the variable amplitude equalization circuit as input. A modulation/demodulation device having a demodulation circuit that inputs the output of the received signal level measurement circuit and a control circuit that controls the variable amplitude equalization circuit, the received signal amplification circuit, the variable frequency oscillator circuit, and the transmission selection circuit. a first bandpass filter circuit, a second bandpass filter circuit and the first bandpass filter circuit;
A modulation/demodulation device comprising: a signal detecting unit that monitors a band eliminator filter that suppresses the pass band of a second band pass filter circuit, inputs the respective outputs, and outputs the output to a control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987050653U JPS63158034U (en) | 1987-04-03 | 1987-04-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987050653U JPS63158034U (en) | 1987-04-03 | 1987-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63158034U true JPS63158034U (en) | 1988-10-17 |
Family
ID=30874208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987050653U Pending JPS63158034U (en) | 1987-04-03 | 1987-04-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63158034U (en) |
-
1987
- 1987-04-03 JP JP1987050653U patent/JPS63158034U/ja active Pending
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