JPS6262625A - Automatic line equalizing system - Google Patents
Automatic line equalizing systemInfo
- Publication number
- JPS6262625A JPS6262625A JP20259785A JP20259785A JPS6262625A JP S6262625 A JPS6262625 A JP S6262625A JP 20259785 A JP20259785 A JP 20259785A JP 20259785 A JP20259785 A JP 20259785A JP S6262625 A JPS6262625 A JP S6262625A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- feedback
- cable
- voltage
- signal
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ＴＶ倍信号の信号のケーブル長等化に関し、
特にクランパ回路の帰還電圧より直流電圧を検出し、接
続されているケーブル長に合わせて自動的にケーブル長
等化を行う方式に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to cable length equalization of TV double signal signals.
In particular, it relates to a method that detects DC voltage from the feedback voltage of a clamper circuit and automatically equalizes the cable length according to the length of the connected cable.
（従来の技術）
ＴＶ倍信号同軸ケーブルや平衡対ケーブルで伝送する場
合、これらのケーブルの周波数特性による画像の劣化を
防ぐために等化回路で補償したり、また、ケーブル伝送
中に発生する低周波誘導雑音を抑圧するためにクランパ
回路が付加される場合がある。クランパ回路ではパルス
クランプ方式や帰還圧縮形のものが知られており、等化
回路ではタップ切換式や連続可変式のものがよく知られ
ている。(Prior technology) When transmitting TV double signals using coaxial cables or balanced pair cables, equalization circuits are used to compensate for image deterioration due to the frequency characteristics of these cables, and low frequencies generated during cable transmission are A clamper circuit may be added to suppress induced noise. Pulse clamp type and feedback compression type clamper circuits are known, and tap switching type and continuously variable type equalizer circuits are well known.
（発明が解決しようとする問題点）
しかし、従来の等化回路では、あらかじめケーブル長を
測定し、その長さに合うように等化量を調整しなければ
ならない。(Problems to be Solved by the Invention) However, in the conventional equalization circuit, the cable length must be measured in advance and the equalization amount must be adjusted to match the length.
（問題点を解決するための手段）
本発明の自動線路等化方式は、送信装置の出力信号に直
流を重畳し送信し、受信装置の帰還圧縮形クランパ回路
の帰還電圧から直流成分を検出し、ケーブル長に応じて
、自動的に等化量を調整する方式である。(Means for Solving the Problems) The automatic line equalization method of the present invention superimposes DC on the output signal of a transmitting device and transmits it, and detects the DC component from the feedback voltage of the feedback compression type clamper circuit of the receiving device. , which automatically adjusts the equalization amount according to the cable length.
（実施例） 次に、本発明について図面を参照して説明する。(Example) Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。こ
の実施例において、１０は送信装置、２０は受信装置、
３０はこれら両装置間を接続するケーブルである。送信
装置１０内では、テレビ信号送信部１１から出力された
ＴＶ倍信号抵抗１２を介して直流電源１３の直流電圧を
重畳し、出力する。出力された信号は、ケーブル３０で
伝送されるが、ケーブル３０による周波数％注の劣化及
び直流損失を受は入力端１９に到達する。入力した信号
は直流増幅器２１でインピーダンスを低くし出力される
。２２は、電圧制御可変減衰器であり、その公称インピ
ーダンスはＲｏである。２３は、コンデンサと固定抵抗
で形成される回路網であり、ケーブル３００種類により
定数が異なるが、その直流インピーダンスは常にＲ６と
なるものである。FIG. 1 is a block diagram showing one embodiment of the present invention. In this embodiment, 10 is a transmitting device, 20 is a receiving device,
30 is a cable connecting these two devices. In the transmitting device 10, the DC voltage of the DC power supply 13 is superimposed via the TV multiplier signal resistor 12 outputted from the TV signal transmitting section 11 and output. The output signal is transmitted through the cable 30, but reaches the input end 19 due to the frequency degradation and DC loss caused by the cable 30. The input signal is lowered in impedance by the DC amplifier 21 and output. 22 is a voltage controlled variable attenuator whose nominal impedance is Ro. 23 is a circuit network formed by a capacitor and a fixed resistor, and although the constant varies depending on the 300 types of cables, its DC impedance is always R6.
電圧制御可変減衰器２２、回路網２３及び抵抗２８によ
り等化回路が構成されている。直流増幅器２１から出力
された信号は、線路等化されたのち差動直流増幅器２４
に入力される。２５は帰還回路であり、差動直流増幅器
２４と帰還回路２５ ″とで帰還圧縮形クランプ回路を
形成している。帰還回路２５の出力には、ケーブル３０
で発生した低周波誘導雑音を打ち消す波形と、送信装置
ｉ。The voltage-controlled variable attenuator 22, the circuit network 23, and the resistor 28 constitute an equalization circuit. The signal output from the DC amplifier 21 is line-equalized and then sent to the differential DC amplifier 24.
is input. 25 is a feedback circuit, and the differential DC amplifier 24 and the feedback circuit 25'' form a feedback compression type clamp circuit.The output of the feedback circuit 25 is connected to a cable 30.
A waveform that cancels the low frequency induced noise generated by the transmitter i.
から重畳された直流電圧を打ち消す直流成分とが合成さ
れている。この帰還回路２５の出力の直流成分のみをロ
ーパスフィルタ２６により検出し、電圧制御可変減衰器
２２の制御電圧を発生する可変減衰器制御部２７へ送り
等化回路を制御する。and a DC component that cancels out the superimposed DC voltage. Only the DC component of the output of this feedback circuit 25 is detected by a low-pass filter 26 and sent to a variable attenuator controller 27 that generates a control voltage for the voltage-controlled variable attenuator 22 to control the equalization circuit.
ケーブル３０の長さによりその直流損失が変化するから
、ケーブル３０の長さにより帰還回路２５の出力の直流
電圧が変化する。この直流電圧により等化回路を制御す
るから、この実施例ではケーブル３０の長さに応じて自
動的に等化できる。Since the DC loss changes depending on the length of the cable 30, the DC voltage output from the feedback circuit 25 changes depending on the length of the cable 30. Since the equalization circuit is controlled by this DC voltage, equalization can be automatically performed according to the length of the cable 30 in this embodiment.
（発明の効果）
以上説明したように、本発明によれば、送信装置ｌの出
力信号に直流を重畳し送信し、受信装置の帰還圧縮形ク
ランパ回路の帰還電圧から直流成分を検出することによ
り、送受両装置間のケーブル長に応じて自動的に振１１
−特性を等化できる効果がある。(Effects of the Invention) As explained above, according to the present invention, by superimposing a direct current on the output signal of the transmitting device l and transmitting it, and detecting the direct current component from the feedback voltage of the feedback compression type damper circuit of the receiving device, , automatically shakes 11 depending on the cable length between the transmitting and receiving devices.
- Has the effect of equalizing characteristics.
第１図は本発明の一実施例を示すブロック図である。
１０・・・送信装置、１１・・・テレビ信号送信部、１
２・・・固定抵抗、１３・・・直流電源、２０・・・受
信装置、２１・・・直流増幅器、２２・・・電圧制御可
変減衰器、２３・・・回路網、２４・・・差動直流増幅
器、２５・・・帰還回路、２６・・・ローパスフィルタ
、２７・・・可変減衰器制御部、２８・・・固定抵抗。FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Transmission device, 11... Television signal transmission part, 1
2... Fixed resistance, 13... DC power supply, 20... Receiving device, 21... DC amplifier, 22... Voltage controlled variable attenuator, 23... Circuit network, 24... Difference Dynamic DC amplifier, 25... Feedback circuit, 26... Low pass filter, 27... Variable attenuator control section, 28... Fixed resistor.
Claims (1)
を伝送し、前記受信装置の等化回路及び帰還圧縮形クラ
ンパ回路により前記ケーブルで前記信号が受けた歪を軽
減する自動線路等化方式において、前記送信装置は前記
信号に直流を重畳して送信し、前記受信装置は前記帰還
圧縮形クランパ回路の帰還電圧から前記直流の成分を検
出する回路を備え、前記等化回路は前記検出回路の出力
の前記直流成分に応じて前記ケーブルの振幅特性を等比
することを特徴とする自動線路等化方式。In the automatic line equalization method, the signal is transmitted from the transmitting device to the receiving device using a cable as a transmission line, and the distortion applied to the signal by the cable is reduced by an equalization circuit and a feedback compression type clamper circuit of the receiving device. The transmitting device superimposes a direct current on the signal and transmits the signal, the receiving device includes a circuit for detecting the direct current component from the feedback voltage of the feedback compression clamper circuit, and the equalizing circuit detects the direct current component from the feedback voltage of the feedback compression clamper circuit. An automatic line equalization method characterized in that the amplitude characteristics of the cable are equalized according to the DC component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20259785A JPS6262625A (en) | 1985-09-13 | 1985-09-13 | Automatic line equalizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20259785A JPS6262625A (en) | 1985-09-13 | 1985-09-13 | Automatic line equalizing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6262625A true JPS6262625A (en) | 1987-03-19 |
Family
ID=16460103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20259785A Pending JPS6262625A (en) | 1985-09-13 | 1985-09-13 | Automatic line equalizing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6262625A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002271236A (en) * | 2001-03-07 | 2002-09-20 | Cybex Computer Products Corp | Equalizer and adaptive video transmitter/receiver using the same and method for removing deviation of video frequency from video signal |
| JP2007131305A (en) * | 2005-11-08 | 2007-05-31 | Hakujuji Co Ltd | Container |
| JP2008504181A (en) * | 2004-06-30 | 2008-02-14 | レキット ベンキサー ナムローゼ フェンノートシャップ | Improvements to packing containers and improvements related to packing containers |
-
1985
- 1985-09-13 JP JP20259785A patent/JPS6262625A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002271236A (en) * | 2001-03-07 | 2002-09-20 | Cybex Computer Products Corp | Equalizer and adaptive video transmitter/receiver using the same and method for removing deviation of video frequency from video signal |
| JP2008504181A (en) * | 2004-06-30 | 2008-02-14 | レキット ベンキサー ナムローゼ フェンノートシャップ | Improvements to packing containers and improvements related to packing containers |
| JP2007131305A (en) * | 2005-11-08 | 2007-05-31 | Hakujuji Co Ltd | Container |
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