JPH05191416A - Automatic termination resistor connector - Google Patents
Automatic termination resistor connectorInfo
- Publication number
- JPH05191416A JPH05191416A JP4002707A JP270792A JPH05191416A JP H05191416 A JPH05191416 A JP H05191416A JP 4002707 A JP4002707 A JP 4002707A JP 270792 A JP270792 A JP 270792A JP H05191416 A JPH05191416 A JP H05191416A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- signal transmission
- transmission line
- terminating resistor
- video 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
Landscapes
- Small-Scale Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
(57)【要約】
【目的】 本発明は、ホームバスのツイストペア線に伝
送される変調された映像信号の有無を検出し、映像信号
が伝送されている期間、信号伝送路を自動的に特性イン
ピーダンスに整合した終端抵抗で終端することにより反
射を防止し、良好な映像信号を伝送させる。
【構成】 信号伝送路に映像信号が伝送されたかどうか
を、信号検出部２内のバンド・パス。フィルタ８にて識
別し、映像信号が入力されている期間、モノ・マルチ・
バイブレータ１２が終端抵抗接続部３を駆動させ、リレ
ースイッチ１９にて信号伝送路に終端抵抗４を接続させ
る。また、映像信号が途絶えた時、モノ・マルチ・バイ
ブレータ１２が終端抵抗接続部３を制御し、信号伝送路
から終端抵抗４を開放させると同時に一定時間モノ・マ
ルチ・バイブレータ１５がモノ・マルチ・バイブレータ
１２の動作を休止させる。(57) [Abstract] [Object] The present invention detects the presence or absence of a modulated video signal transmitted to a twisted pair line of a home bus, and automatically characterizes a signal transmission path during the transmission of the video signal. By terminating with a terminating resistor that matches the impedance, reflection is prevented and a good video signal is transmitted. [Structure] A band pass in the signal detector 2 for determining whether or not a video signal is transmitted to a signal transmission path. It is identified by the filter 8 and mono / multi /
The vibrator 12 drives the terminating resistor connecting portion 3, and the relay switch 19 connects the terminating resistor 4 to the signal transmission path. Further, when the video signal is interrupted, the mono-multi vibrator 12 controls the terminating resistor connecting section 3 to open the terminating resistor 4 from the signal transmission path, and at the same time, the mono-multi vibrator 15 is mono-multi vibrating. The operation of the vibrator 12 is stopped.
Description
【０００１】[0001]
【産業上の利用分野】本発明はホームバスシステムなど
のバス型のネットワークシステムにおける信号伝送路の
終端抵抗接続装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal resistance connecting device for a signal transmission line in a bus type network system such as a home bus system.
【０００２】[0002]
【従来の技術】図２は、ホームバスシステムのようなバ
ス型のネットワークシステムにおける映像伝送システム
のブロック構成図を示すものである。2. Description of the Related Art FIG. 2 shows a block diagram of a video transmission system in a bus type network system such as a home bus system.
【０００３】図２において、２１ａ，２１ｂはホームバ
スのツイストペア線である信号伝送路であり、２１ａ，
２１ｂで１つのペア線を構成する。２２は映像信号送信
器であり、カメラ２３で入力したビデオ信号を予め定め
られた周波数帯域で周波数変調し、信号伝送路２１ａ，
２１ｂに送信する。２４は、信号伝送路２１ａ，２１ｂ
に接続された映像信号受信器であり、信号伝送路２１
ａ，２１ｂ上に送出されている変調された映像信号を受
信し、かつ受信した映像信号を復調し、ビデオ信号をモ
ニタ２５に出力する。２６は、信号伝送路２１ａ，２１
ｂの片端である終端部であり、従来の例では終端部２６
は信号伝送路２１ａ，２１ｂを開放状態にしているか、
もしくは信号伝送路２１ａ，２１ｂに送出される映像信
号の周波数帯域での信号伝送路２１ａ，２１ｂの特性イ
ンピーダンスと等しいインピーダンスを持つ終端抵抗で
信号伝送路２１ａ，２１ｂを終端している。In FIG. 2, reference numerals 21a and 21b denote signal transmission lines which are twisted pair wires of a home bus.
21b constitutes one pair line. Reference numeral 22 is a video signal transmitter, which frequency-modulates the video signal input by the camera 23 in a predetermined frequency band to generate a signal transmission path 21a,
21b. 24 is a signal transmission path 21a, 21b
A video signal receiver connected to the signal transmission line 21
It receives the modulated video signal transmitted on a and 21b, demodulates the received video signal, and outputs the video signal to the monitor 25. 26 is a signal transmission path 21a, 21
It is a terminating end that is one end of b, and in the conventional example, terminating end 26
Is the signal transmission lines 21a and 21b open,
Alternatively, the signal transmission lines 21a, 21b are terminated by a terminating resistor having an impedance equal to the characteristic impedance of the signal transmission lines 21a, 21b in the frequency band of the video signal transmitted to the signal transmission lines 21a, 21b.
【０００４】映像信号受信器２４は信号伝送路２１ａ，
２１ｂ上の任意の場所で接続され、なおかつ複数台接続
されうる。The video signal receiver 24 includes a signal transmission line 21a,
21b can be connected at any place, and a plurality of units can be connected.
【０００５】[0005]
【発明が解決しようとする課題】このような従来のホー
ムバスのツイストペア線を利用した映像伝送システムで
は、信号伝送路の終端部が開放状態であれば、信号伝送
路の終端部で反射が起こり、信号伝送路のある場所にお
いて定在波が生じる。このため、映像信号受信器の接続
場所によっては、伝送された映像信号を減衰し、良好な
復調映像を得られないという問題が生じる。In such a conventional video transmission system using twisted pair wires of a home bus, reflection occurs at the terminal end of the signal transmission line when the terminal end of the signal transmission line is in an open state. , A standing wave is generated at a place with a signal transmission path. For this reason, depending on the connection location of the video signal receiver, the transmitted video signal is attenuated, and there arises a problem that a good demodulated video cannot be obtained.
【０００６】一方、信号伝送路の特性インピーダンスと
等しいインピーダンスの終端抵抗を信号伝送路の終端部
に接続することにより、反射を防ぐことが可能である。
しかしながら、常時終端抵抗を接続することは、別の低
い周波数帯域の信号例えば音声信号を伝送する場合に、
信号伝送路のインピーダンスが低下するため、ハム雑音
が生じるなどの不都合が発生する。On the other hand, reflection can be prevented by connecting a terminating resistor having an impedance equal to the characteristic impedance of the signal transmission line to the terminal end of the signal transmission line.
However, always connecting the terminating resistor, when transmitting a signal of another low frequency band, for example, a voice signal,
Since the impedance of the signal transmission line is lowered, hum noise occurs and other inconveniences occur.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記課題を解
決するために、第１の手段として、信号伝送路の片端
に、信号伝送路上に送出された予め定められた帯域の周
波数の信号の有無を検出する信号検出部と、信号伝送路
を終端する終端抵抗と、信号検出部の出力により終端抵
抗を信号伝送路に接続する終端抵抗接続部を設け、信号
伝送路に予め定められた周波数帯域の信号を検出した時
に自動的に信号伝送路を終端抵抗にて電気的に終端する
手段を設ける。In order to solve the above-mentioned problems, the present invention provides, as a first means, a signal of a frequency in a predetermined band, which is sent to one end of a signal transmission line and which is transmitted on the signal transmission line. A signal detection unit for detecting the presence / absence of a signal, a terminating resistor for terminating the signal transmission line, and a terminating resistor connection unit for connecting the terminating resistor to the signal transmission line by the output of the signal detection unit are provided, and the signal transmission line is predetermined. A means for automatically electrically terminating the signal transmission path with a terminating resistor is provided when a signal in the frequency band is detected.
【０００８】第２の手段として、信号検出部は、信号伝
送路上に送出された予め定められた帯域の周波数の信号
が途絶えたことを検出した時、終端抵抗を信号伝送路か
ら切断すると同時に信号伝送路の信号を予め定められた
時間だけ検出しない手段を設ける。As a second means, when the signal detecting section detects that the signal of the frequency in the predetermined band transmitted on the signal transmission line is interrupted, it disconnects the terminating resistor from the signal transmission line and at the same time the signal is transmitted. A means is provided for not detecting the signal on the transmission line for a predetermined time.
【０００９】[0009]
【作用】本発明は上記した構成により、変調された映像
信号が信号伝送路に送出している期間だけ、信号伝送路
を自動的に特性インピーダンスに整合した終端抵抗で終
端することにより反射を防止し、良好な映像信号を伝送
することが可能であり、さらに、終端抵抗切断時に発生
するスイッチングノイズ等で誤って再び終端抵抗を接続
することを回避することができる。According to the present invention, the reflection is prevented by automatically terminating the signal transmission line with the terminating resistor matched to the characteristic impedance only while the modulated video signal is being sent to the signal transmission line. However, it is possible to transmit a good video signal, and it is possible to avoid accidentally reconnecting the terminating resistor due to switching noise or the like generated when the terminating resistor is disconnected.
【００１０】[0010]
【実施例】図１は、本発明の自動終端抵抗接続装置の一
構成実施例を示す構成図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a structural embodiment of an automatic termination resistance connecting device of the present invention.
【００１１】本発明では、図１の自動終端抵抗接続装置
は図３に示した映像伝送システムの終端部２６に対応す
るものである。以下、図１および図２を用いて、本発明
の実施例を述べる。In the present invention, the automatic termination resistance connection device of FIG. 1 corresponds to the termination unit 26 of the video transmission system shown in FIG. Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.
【００１２】図１において、１は本発明の一実施例であ
る自動終端抵抗接続装置であり、信号伝送路２１ａ，２
１ｂの片端に接続コネクタ部２０ａ，２０ｂを介して接
続される。In FIG. 1, reference numeral 1 denotes an automatic termination resistance connecting device which is an embodiment of the present invention, and which is a signal transmission path 21a, 2
It is connected to one end of 1b via connection connector parts 20a and 20b.
【００１３】信号検出部２は映像信号送信器２２から送
出された予め定められた周波数帯域で周波数変調された
映像信号の有無を検出する機能を有し、信号伝送路２１
ａ，２１ｂに重畳される直流成分をカットするコンデン
サ５および６と、ハイインピーダンス入力のトランス７
と、伝送される映像信号の周波数帯域のみ通すバンド・
パス・フィルタ８と、入力信号を増幅する増幅器９と、
２個のモノ・マルチ・バイブレータ１２および１５から
構成される。The signal detector 2 has a function of detecting the presence or absence of a video signal sent from the video signal transmitter 22 and frequency-modulated in a predetermined frequency band.
capacitors 5 and 6 for cutting DC components superimposed on a and 21b, and a transformer 7 with high impedance input
And a band that passes only the frequency band of the transmitted video signal.
A pass filter 8 and an amplifier 9 for amplifying the input signal,
It is composed of two mono-multi vibrators 12 and 15.
【００１４】終端抵抗接続装置３は、信号検出部２から
の信号により制御され、リレースイッチ１９と、リレー
スイッチ１９を駆動するトランジスタ１８および抵抗１
６，１７から構成される。The terminating resistor connecting device 3 is controlled by a signal from the signal detecting section 2 and has a relay switch 19, a transistor 18 for driving the relay switch 19 and a resistor 1.
It is composed of 6,17.
【００１５】終端抵抗４は、周波数変調された映像信号
の伝送周波数帯域における信号伝送路２１ａ，２１ｂの
特性インピーダンスと等しいインピーダンスを持つもの
である。The terminating resistor 4 has an impedance equal to the characteristic impedance of the signal transmission lines 21a and 21b in the transmission frequency band of the frequency-modulated video signal.
【００１６】次に、動作について説明する。初期状態に
おいて、リレースイッチ１９はオフ状態になっており、
終端抵抗４は、信号伝送路２１ａ，２１ｂに接続されて
いない。この状態で、映像信号送信器２２が、カメラか
ら入力した映像を周波数変調し、信号伝送路２１ａ，２
１ｂに送出すると、映像信号はコネクタ２０ａ，２０ｂ
およびコンデンサ５，６を介してトランス７に入力さ
れ、さらにバンド・パス・フィルタ８にて予め定められ
た周波数帯域の信号のみ通過し、増幅器９で映像信号が
増幅される。増幅された映像信号は、モノ・マルチ・バ
イブレータ１２のＢ１端子に入力され、モノ・マルチ・
バイブレータ１２のＢ１端子に映像信号が入力されてい
る期間、モノ・マルチ・バイブレータ１２のＱ１端子は
Ｈｉｇｈレベルを出力する。モノ・マルチ・バイブレー
タ１２のＱ１端子がＨｉｇｈレベルを出力すると、トラ
ンジスタ１８はオンし、リレースイッチ１９を駆動させ
る。リレースイッチ１９が駆動すると終端抵抗４は信号
伝送路２１ａ，２１ｂに接続され、信号伝送路２１ａ，
２１ｂは、終端抵抗４にて終端される。Next, the operation will be described. In the initial state, the relay switch 19 is off,
The terminating resistor 4 is not connected to the signal transmission lines 21a and 21b. In this state, the video signal transmitter 22 frequency-modulates the video input from the camera, and the signal transmission paths 21a, 2
1b, the video signals are transmitted to the connectors 20a and 20b.
Further, the signal is input to the transformer 7 via the capacitors 5 and 6, and only the signal in the predetermined frequency band is passed by the band pass filter 8, and the video signal is amplified by the amplifier 9. The amplified video signal is input to the B1 terminal of the mono multi vibrator 12, and the mono multi
While the video signal is being input to the B1 terminal of the vibrator 12, the Q1 terminal of the mono-multi vibrator 12 outputs High level. When the Q1 terminal of the mono-multi vibrator 12 outputs a high level, the transistor 18 is turned on and the relay switch 19 is driven. When the relay switch 19 is driven, the terminating resistor 4 is connected to the signal transmission lines 21a and 21b,
21b is terminated by the termination resistor 4.
【００１７】次に、映像信号送信器２２が、映像信号の
送出を終了すると、信号伝送路２１ａ，２１ｂにはには
予め定められた周波数帯域の映像信号が途絶えるため、
モノ・マルチ・バイブレータ１２のＢ１端子には信号が
入力されない状態に変化する。この結果、モノ・マルチ
・バイブレータ１２のＱ１端子はＨｉｇｈレベルからＬ
ｏｗレベルに変化し、この信号は別のモノ・マルチ・バ
イブレータ１５のＡ２端子に入力され、抵抗１３および
コンデンサ１４の値で求められる時定数の時間だけ＊Ｑ
２端子をＬｏｗレベルに保持する。モノ・マルチ・バイ
ブレータ１５の＊Ｑ２端子の出力はモノ・マルチ・バイ
ブレータ１２の＊ＣＬＲ端子に入力されているため、モ
ノ・マルチ・バイブレータ１５の＊ＣＬＲ端子の出力が
Ｌｏｗ状態である時間だけモノ・マルチ・バイブレータ
１２は動作を休止する。Next, when the video signal transmitter 22 finishes sending the video signal, the video signal in the predetermined frequency band is cut off in the signal transmission paths 21a and 21b.
The B1 terminal of the mono-multi vibrator 12 changes to a state in which no signal is input. As a result, the Q1 terminal of the mono-multi vibrator 12 changes from High level to L
This signal changes to the ow level, and this signal is input to the A2 terminal of another mono-multi vibrator 15, and for the time of the time constant obtained by the values of the resistor 13 and the capacitor 14 * Q
Hold the 2 terminals at Low level. The output of the * Q2 terminal of the mono multi-vibrator 15 is input to the * CLR terminal of the mono multi-vibrator 12, so that the output of the * CLR terminal of the mono multi-vibrator 15 is mono when the output is low. -The multi-vibrator 12 stops operating.
【００１８】以上のように、信号伝送路２１ａ，２１ｂ
に送出される予め定められた周波数帯域の映像信号を信
号検出部２にて検出し、検出している期間、終端抵抗接
続部３が信号検出部２によって駆動され、終端抵抗４が
信号伝送路２１ａ，２１ｂに接続される。さらに、信号
伝送路２１ａ，２１ｂに送出されていた映像信号が途絶
えた時、信号検出部２にて映像信号が途絶えたことを検
出し、終端抵抗接続部３の駆動を終了させ、リレースイ
ッチ１９をオフさせることにより、終端抵抗４が信号伝
送路２１ａ，２１ｂから開放される。このとき、リレー
スイッチ１９の開放時に発生するスイッチングノイズを
信号検出部２が映像信号として誤って検出しないよう
に、一定時間だけ信号検出部２内のモノ・マルチ・バイ
ブレータ１２の動作を休止させる。As described above, the signal transmission lines 21a, 21b
The video signal of a predetermined frequency band transmitted to the signal detecting section 2 is detected by the signal detecting section 2, and the terminating resistor connecting section 3 is driven by the signal detecting section 2 and the terminating resistor 4 is connected to the signal transmission line during the detection period. 21a and 21b are connected. Furthermore, when the video signal transmitted to the signal transmission paths 21a and 21b is interrupted, the signal detection unit 2 detects that the video signal is interrupted, terminates the driving of the terminating resistor connection unit 3, and the relay switch 19 Is turned off, the terminating resistor 4 is released from the signal transmission paths 21a and 21b. At this time, the operation of the mono-multi vibrator 12 in the signal detecting unit 2 is suspended for a certain period of time so that the signal detecting unit 2 does not erroneously detect the switching noise generated when the relay switch 19 is opened as a video signal.
【００１９】また、信号伝送路２１ａ，２１ｂに別の周
波数帯域の信号、例えば音声信号が送出された場合、信
号検出部２内のバンド・パス・フィルタ８にて伝送され
る信号がカットされるため、信号検出部２内のモノ・マ
ルチ・バイブレータ１２のＢ１端子には信号が入力され
ないため、信号検出部２は終端抵抗接続部３を駆動させ
ない。つまり、映像信号として予め定められた周波数帯
域以外の信号が信号伝送路２１ａ，２１ｂに送出されて
も、リレースイッチ１９はオンしないため終端抵抗４は
信号伝送路２１ａ，２１ｂに接続されない。When a signal in another frequency band, for example, a voice signal is transmitted to the signal transmission lines 21a and 21b, the signal transmitted by the band pass filter 8 in the signal detector 2 is cut. Therefore, no signal is input to the B1 terminal of the mono-multi vibrator 12 in the signal detection unit 2, so the signal detection unit 2 does not drive the terminating resistor connection unit 3. That is, even if a signal other than the predetermined frequency band as the video signal is sent to the signal transmission lines 21a and 21b, the relay switch 19 does not turn on, so that the terminating resistor 4 is not connected to the signal transmission lines 21a and 21b.
【００２０】[0020]
【発明の効果】以上のように本発明により、第１の効果
として変調された映像信号が信号伝送路に送出している
期間だけ、信号伝送路を自動的に特性インピーダンスに
整合した終端抵抗で終端することにより終端部からの反
射を防止し、良好な映像信号を伝送することが可能であ
り、第２の効果として、終端抵抗切断時に発生するスイ
ッチングノイズを映像信号として誤って検出せず、再び
終端抵抗を信号伝送路に接続するといったことを回避で
きる。As described above, according to the present invention, as a first effect, the signal transmission path is automatically adjusted to the characteristic impedance by the terminating resistor only while the modulated video signal is being sent to the signal transmission path. By terminating, it is possible to prevent reflection from the terminating end and transmit a good video signal. As a second effect, switching noise generated when the terminating resistor is disconnected is not erroneously detected as a video signal, It is possible to avoid connecting the terminating resistor to the signal transmission line again.
【図１】本発明の実施例の自動終端抵抗接続装置の構成
図FIG. 1 is a configuration diagram of an automatic termination resistance connecting device according to an embodiment of the present invention.
【図２】従来例における映像伝送システムのブロック構
成図FIG. 2 is a block configuration diagram of a video transmission system in a conventional example.
１ 自動終端抵抗接続装置 ２ 信号検出部 ３ 終端抵抗接続部 ４ 終端抵抗 1 Automatic termination resistance connection device 2 Signal detection section 3 Termination resistance connection section 4 Termination resistance
Claims (2)
声信号または変調された映像信号を伝送する複数の端末
から構成されるバス型のネットワークシステムにおい
て、前記信号伝送路の片端に接続し、前記信号伝送路上
に送出された予め定められた帯域の周波数の信号の有無
を検出する信号検出部と、前記信号伝送路を終端する終
端抵抗と、前記信号検出部の出力により前記終端抵抗を
前記信号伝送路に接続する終端抵抗接続部を具備し、前
記信号伝送路に予め定められた周波数帯域の信号を検出
した時に自動的に前記信号伝送路を前記終端抵抗にて電
気的に終端することを特徴とする自動終端抵抗接続装
置。1. A bus type network system comprising a signal transmission line and a plurality of terminals for transmitting an audio signal or a modulated video signal via the signal transmission line, the bus type network system being connected to one end of the signal transmission line. , A signal detection unit for detecting the presence or absence of a signal of a frequency in a predetermined band transmitted on the signal transmission line, a terminating resistor for terminating the signal transmission line, and an output of the signal detection unit for terminating the resistor. A termination resistance connecting portion that is connected to the signal transmission line is provided, and the signal transmission line is automatically electrically terminated by the termination resistor when a signal in a predetermined frequency band is detected in the signal transmission line. An automatic terminating resistor connecting device characterized in that
送出された予め定められた帯域の周波数の信号が途絶え
たことを検出した時、前記終端抵抗を前記信号伝送路か
ら切断すると同時に前記信号伝送路の信号を予め定めら
れた時間だけ検出しない期間を設けることを特徴とする
請求項１記載の自動終端抵抗接続装置。2. The signal detecting section disconnects the terminating resistor from the signal transmission path at the same time when the signal detecting section detects that the signal of the frequency in the predetermined band transmitted on the signal transmission path is interrupted. The automatic termination resistance connecting device according to claim 1, wherein a period during which a signal on the signal transmission path is not detected for a predetermined time is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4002707A JPH05191416A (en) | 1992-01-10 | 1992-01-10 | Automatic termination resistor connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4002707A JPH05191416A (en) | 1992-01-10 | 1992-01-10 | Automatic termination resistor connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05191416A true JPH05191416A (en) | 1993-07-30 |
Family
ID=11536769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4002707A Pending JPH05191416A (en) | 1992-01-10 | 1992-01-10 | Automatic termination resistor connector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05191416A (en) |
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-
1992
- 1992-01-10 JP JP4002707A patent/JPH05191416A/en active Pending
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