JPH0252559A - Order-wire branch device - Google Patents
Order-wire branch deviceInfo
- Publication number
- JPH0252559A JPH0252559A JP63204076A JP20407688A JPH0252559A JP H0252559 A JPH0252559 A JP H0252559A JP 63204076 A JP63204076 A JP 63204076A JP 20407688 A JP20407688 A JP 20407688A JP H0252559 A JPH0252559 A JP H0252559A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- line
- station
- circuit
- switch
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は打合せ用分岐装置に関し、特に4線式伝送路の
端局及び分岐局相互間で通話に使用する打合せ用分岐装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a meeting branching device, and more particularly to a meeting branching device used for communication between end stations and branch stations of a four-wire transmission line.
従来の打合せ用分岐装置は、音声帯域(VFと記す)を
用いたアナログ方式と、ディジタル伝送路を用いたディ
ジタル方式とがある。VFを用いたアナログ方式では、
分岐した場合のレベル変化及びひずみが増加するので、
多中継や多分岐の場合には、ディジタル方式が用いられ
る。Conventional meeting branching devices include an analog system using a voice band (denoted as VF) and a digital system using a digital transmission path. In the analog method using VF,
Since the level change and distortion increase when branching,
In the case of multiple relays or multiple branches, a digital system is used.
第2図は従来の打合せ分岐装置の一例のブロック図であ
る。第2図において、伝送路16から信号が入力され同
期回路18を通り加算回路20に入る。加算器20では
、C0DEC2Bからの出力が無通話時であってもμm
4ow又はA−ηaWの圧伸側によって、リニアレベル
のゼロにはならず、更に置盤24からの雑音もPCM変
換されて加算され伝送路26に送出される。FIG. 2 is a block diagram of an example of a conventional meeting branching device. In FIG. 2, a signal is input from a transmission line 16, passes through a synchronization circuit 18, and enters an adder circuit 20. In the adder 20, the output from C0DEC2B is μm even when there is no call.
Due to the companding side of 4ow or A-ηaW, the linear level does not reach zero, and the noise from the mounting plate 24 is also PCM converted, added, and sent to the transmission line 26.
上述した従来の打合せ用分岐装置は、無通話時に伝送路
16の入力信号と置盤24の雑音が加算されて伝送路2
6に送出されるので、分岐接続局の数に比例して通信品
質が劣化し、また、使用のDTEF信号を識別できない
という欠点がある。In the above-mentioned conventional branching device for meetings, when there is no call, the input signal of the transmission line 16 and the noise of the tabletop 24 are added and the input signal of the transmission line 2 is added.
6, the communication quality deteriorates in proportion to the number of branch connection stations, and there is also the disadvantage that the DTEF signal being used cannot be identified.
本発明の打合せ用分岐装置は、4線式打合せ伝送路の送
信線と受信線から分岐した選局用の選択信号を出力する
加算回路と、前記選択信号によって呼び出されたとき制
御信号を出力する電話器盤と、この電話器盛からの通話
信号線を前記制御信号が出力されているときのみ前記送
信線と受信線に接続する切換器とを有している。The meeting branching device of the present invention includes an adder circuit that outputs a selection signal for channel selection branched from a transmission line and a reception line of a four-wire meeting transmission line, and an adder circuit that outputs a control signal when called by the selection signal. It has a telephone board and a switch that connects the call signal line from the telephone board to the transmitting line and the receiving line only when the control signal is being output.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第1図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
第1図の本実施例は、伝送路1から選局用の選択信号が
同期回路3に入力される。ここで通常時、分岐回路4の
切換器11はa側に接続されており、入力信号は切換器
1]、を通ってそのまま同期回路13に伝えられ、伝送
路14に出力される。 また、選択信号は加算回路6に
も入力され、C0DEC8で復号化され、電話器盤9に
入力される。In the present embodiment shown in FIG. 1, a selection signal for channel selection is input from a transmission line 1 to a synchronization circuit 3. Normally, the switch 11 of the branch circuit 4 is connected to the a side, and the input signal is transmitted as it is to the synchronous circuit 13 through the switch 1 and output to the transmission line 14. The selection signal is also input to the adder circuit 6, decoded by the CODEC 8, and input to the telephone board 9.
電話器盤9では、自局の局番号と受信した選択信号の番
号が照合され、一致した場合には制御信号10により切
換器11をb側に切り換えたのち、リングバックトーン
を送出し、電話機のオフフックによって通話可能となる
。On the telephone panel 9, the station number of the own station and the number of the received selection signal are compared, and if they match, the switch 11 is switched to side b by the control signal 10, and a ringback tone is sent out, and the telephone Calls can be made by going off-hook.
通話終了時は、相手局からのオンフッタ信号が伝送路1
から同期回路3と加算回路6とC0DEC8を通り電話
器盤9で受信し、オンフック信号と確認した場合には制
御信号10により切換器11をa側に切り換える。伝送
路15側からの呼び出しについても上記と同様に行われ
る。When the call ends, the on-footer signal from the other party is sent to transmission path 1.
The signal is received by the telephone panel 9 through the synchronization circuit 3, addition circuit 6, and CODEC 8, and when it is confirmed to be an on-hook signal, the switch 11 is switched to the a side by the control signal 10. Calls from the transmission path 15 side are also performed in the same manner as above.
自局から相手局の呼び出しは、電話器盛りの制御信号1
0により切換器11.12をb側に切り換えて相手局を
呼び出す選択信号を送出する。ju択倍信号C0DEC
8から分岐し、一方は、加算回路5と切換器11と同期
回路13を通って伝送路14に送出され、他方は、加算
回路7と切換器12と同期回路3を通って伝送路2に送
出される通話終了時は、電話器fB9からオンフッタ信
号を送信した後、制御信号10により切換器1 ]、
、12をa側に切り換え初期状態にもどる。When calling from your own station to the other station, use control signal 1 on the phone.
0, the switching devices 11 and 12 are switched to the b side and a selection signal for calling the partner station is sent out. ju selection multiplication signal C0DEC
One branch is sent to the transmission line 14 through the adder circuit 5, the switch 11, and the synchronization circuit 13, and the other is sent to the transmission line 2 through the adder circuit 7, the switch 12, and the synchronization circuit 3. At the end of the transmitted call, after transmitting an on-footer signal from the telephone fB9, the control signal 10 is used to switch the switch 1],
, 12 to the a side and return to the initial state.
以上説明したように本発明は、4線式打合せ伝送路の送
信線と受信線に自局が通話を行うときのみ通話回路を接
続することによって、分岐接続局が多くなっても各局か
ら発生する雑音を減せるので音声品質の低下を防止でき
るという効果がある。As explained above, the present invention connects the communication circuit to the transmitting line and receiving line of the 4-wire meeting transmission line only when the own station makes a call, so that even if there are many branches connected, the generation from each station can be avoided. This has the effect of preventing deterioration in voice quality since noise can be reduced.
」 ユ” Yu
第1図は本発明の一実施例のブロック図、第2図は従来
の打合せ用分岐装置の一例を示すブロック図である。
1.2,14.15・・・伝送路、3,13・・・同期
回路、4・・・分岐回路、5,6.7・・・加算回路、
8・・・C0DEC19・・・電話器盤、10・・・制
御信号、11.12・・・切換器。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional meeting branching device. 1.2, 14.15... Transmission line, 3, 13... Synchronous circuit, 4... Branch circuit, 5, 6.7... Adder circuit,
8...C0DEC19...Telephone panel, 10...Control signal, 11.12...Switching device.
Claims (1)
用の選択信号を出力する加算回路と、前記選択信号によ
って呼び出されたとき制御信号を出力する電話器盤と、
この電話器盤からの通話信号線を前記制御信号が出力さ
れているときのみ前記送信線と受信線に接続する切換器
とを有することを特徴とする打合せ用分岐装置。an adder circuit that outputs a selection signal for channel selection branched from a transmission line and a reception line of a four-wire meeting transmission line; a telephone board that outputs a control signal when called by the selection signal;
A branching device for a meeting, characterized in that it has a switch that connects a call signal line from the telephone board to the transmitting line and the receiving line only when the control signal is being output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63204076A JPH0252559A (en) | 1988-08-16 | 1988-08-16 | Order-wire branch device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63204076A JPH0252559A (en) | 1988-08-16 | 1988-08-16 | Order-wire branch device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0252559A true JPH0252559A (en) | 1990-02-22 |
Family
ID=16484377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63204076A Pending JPH0252559A (en) | 1988-08-16 | 1988-08-16 | Order-wire branch device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0252559A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5282193A (en) * | 1990-11-24 | 1994-01-25 | Fujitsu Limited | Maintenance signal transmission system |
-
1988
- 1988-08-16 JP JP63204076A patent/JPH0252559A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5282193A (en) * | 1990-11-24 | 1994-01-25 | Fujitsu Limited | Maintenance signal transmission system |
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