JPS61296889A - Trunk line interface circuit - Google Patents

Trunk line interface circuit

Info

Publication number
JPS61296889A
JPS61296889A JP13873485A JP13873485A JPS61296889A JP S61296889 A JPS61296889 A JP S61296889A JP 13873485 A JP13873485 A JP 13873485A JP 13873485 A JP13873485 A JP 13873485A JP S61296889 A JPS61296889 A JP S61296889A
Authority
JP
Japan
Prior art keywords
circuit
dial pulse
interface circuit
signal
pulse 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
Application number
JP13873485A
Other languages
Japanese (ja)
Inventor
Hiroshi Ooyama
大山 宏史
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP13873485A priority Critical patent/JPS61296889A/en
Publication of JPS61296889A publication Critical patent/JPS61296889A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To delete noise during transmitting a dial pulse signal and completing by connecting and controlling a cutting of a sound signal line of a sound interface circuit after a prescribed time when there is a designation for changing over a dial pulse transmission circuit and the sound interface circuit. CONSTITUTION:At a time of start for transmitting a dial pulse signal, a signal for changing over a relay 3 to a contact 3a appears on a control line 10 and a delay circuit 8 cuts an analog switch 7 through a control line 11. At this time, the delay circuit 8 generates a delay signal capable of cutting the analog switch 7 before the generation of a change over noise of the relay 3. On completing the transmission of the dial pulse signal, a signal for changing over the relay 3 to a contact 3b appears on the control line 10 and the delay circuit 8 connects the analog switch 7 through the control line 11. At this time, the delay circuit 8 generates the delay signal capable of connecting the analog switch 7 after the generation of the change over noise of the relay 3.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、構内交換機または、ボタン電話装置とダイヤ
ルパルス信号方式の二線アナログ局線との間に接続され
るインタフェース回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interface circuit connected between a private branch exchange or a key telephone device and a two-wire analog central office line using dial pulse signaling.

ここでいう局線には、公衆電話回線の他に専用線その他
交換装置に収容された回線も含まれる。
The central office line here includes not only public telephone lines but also leased lines and other lines housed in switching equipment.

〔従来の技術〕[Conventional technology]

従来、この種のインタフェース回路は、二線アナログ局
線に伝送されている信号から直流分を除去し音声信号を
取り出す音声インタフェース回路と、二線アナログ局線
へダイヤルパルス信号を送出するダイヤルパルス信号送
出回路とを含6、ダイヤルパルス信号送出を行う場合、
二線アナログ局線を音声インタフェース回路からダイヤ
ルパルス信号送出回路に切換え、ダイヤルパルス送出を
終えると、その逆の切換えを行っている。
Conventionally, this type of interface circuit consists of an audio interface circuit that removes the DC component from the signal transmitted to the two-wire analog office line and extracts the audio signal, and a dial pulse signal that sends the dial pulse signal to the two-wire analog office line. 6. When transmitting dial pulse signals,
The two-wire analog office line is switched from the voice interface circuit to the dial pulse signal sending circuit, and when dial pulse sending is finished, the reverse switching is performed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述したような音声インターフェース回路とダイヤルパ
ルス信号送出回路を切換える方法では、ダイヤルパルス
信号の送出中、雑音が構内交換機またはボタン電話装置
へ入力するのを防止できるが、ダイヤルパルス信号の送
出前、または送出後に行う音声インタフェース回路とダ
イヤルパルス信号送出回路の切換時には、音声インタフ
ェース回路を介して構内交換機又はボタン電話装置へ切
換えによる雑音が入力するという欠点がある。
The method of switching between the voice interface circuit and the dial pulse signal sending circuit as described above can prevent noise from entering the private branch exchange or key telephone device while the dial pulse signal is being sent. When switching between the voice interface circuit and the dial pulse signal sending circuit after transmission, there is a drawback that noise due to the switching is input to the private branch exchange or key telephone device via the voice interface circuit.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の局線インタフェース回路は、二線アナログ局線
から音声信号を取り出す音声インタフェース回路と、ダ
イヤルパルス信号送出回路と、二線アナログ局線を上記
音声インタフェース回路とダイヤルパルス信号送出回路
のいずれか一方に接続する切換手段と、上記音声インタ
フェース回路の音声信号線の切換えを上記音声インタフ
ェース回路とダイヤルパルス信号送出口路の切換制御指
示があってから所定時間後に行う手段とを含み、音声イ
ンタフェース回路とダイヤルパルス信号送出回路との切
換時に発生する雑音の削減を行う。
The office line interface circuit of the present invention includes an audio interface circuit that extracts audio signals from a two-wire analog office line, a dial pulse signal sending circuit, and a two-wire analog office line that extracts audio signals from either the audio interface circuit or the dial pulse signal sending circuit. and means for switching the audio signal line of the audio interface circuit a predetermined time after a switching control instruction is given between the audio interface circuit and the dial pulse signal output path, the audio interface circuit This reduces the noise that occurs when switching between the dial pulse signal sending circuit and the dial pulse signal sending circuit.

〔実施例〕〔Example〕

次に本発明の実施例について図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the drawings.

図面は本発明の実株例を示すブロック図である。The drawing is a block diagram showing an actual example of the present invention.

図において、局線インタフェース回路はダイヤルパルス
信号方式の二線アナログ局線端子1と、この局線端子1
との接続を、音声インタフェース5とダイヤルパルス信
号送出回路4とのいずれかに切換えるリレー3を備え、
さらにリレー3の動作を制御するための制御m10がI
J lノー駆動回路9と遅延回路8に接続されている。
In the figure, the office line interface circuit includes a two-wire analog office line terminal 1 using a dial pulse signal system, and this office line terminal 1.
a relay 3 for switching the connection between the audio interface 5 and the dial pulse signal sending circuit 4;
Furthermore, the control m10 for controlling the operation of the relay 3 is
J I is connected to the no drive circuit 9 and the delay circuit 8.

遅延回路8の出力は、音声信号の接続、切断制御の行な
える半導体アナログスイッチ7に、アナログスイッチ制
御線11を経由して接続されている。音声インタフェー
ス5は二線アナログ局線から音声信号だけを取り出し、
音声信号線6を介してボタン電話装置又は構内交換機へ
音声信号を送出する。
The output of the delay circuit 8 is connected via an analog switch control line 11 to a semiconductor analog switch 7 that can control connection and disconnection of audio signals. The audio interface 5 extracts only the audio signal from the two-wire analog office line,
A voice signal is sent to a key telephone device or a private branch exchange via the voice signal line 6.

このように構成された本発明の実施例の動作について説
明する。
The operation of the embodiment of the present invention configured as described above will be explained.

通常の状態では、リレー3は接点3bJC接続され、I
J l、 −3の制御線10より遅延回路8を経由した
アナログスイッチ7の制御?fs11は、アナログスイ
ッチ7を接続の状態に保っている。
Under normal conditions, relay 3 is connected to contact 3bJC, and I
Control of the analog switch 7 via the delay circuit 8 from the control line 10 of J l, -3? fs11 keeps analog switch 7 in a connected state.

ダイヤルパルス信号の送出開始時には、す1ノー3を接
点3aに切換えるための信号が、リレー30制御線10
に現われ、これを受けて遅延回路8も制御線11を介し
てアナログスイッチ7を切断する。この時遅延回路8は
、リレー3の切換え雑音発生以前にアナログスイッチ7
を切断できる遅延信号を発生することが条件とされる。
At the start of sending the dial pulse signal, a signal for switching S1NO3 to contact 3a is sent to relay 30 control line 10.
In response to this, the delay circuit 8 also disconnects the analog switch 7 via the control line 11. At this time, the delay circuit 8 interrupts the analog switch 7 before the switching noise of the relay 3 occurs.
The condition is to generate a delay signal that can disconnect the signal.

ダイヤルパルス信号の送出終了時には、リレー3を接点
3bに切換えるための信号が、IJ+/3の制御線10
に現れ、これを受けて遅延回路8は制御線11を介して
アナログスイッチ7を接続する。この時、遅延回路8は
り1/−3の切換え雑音発生以後に、アナログスイッチ
7を接続できる遅延信号を発生することが条件とされる
At the end of sending the dial pulse signal, a signal for switching the relay 3 to the contact 3b is sent to the control line 10 of IJ+/3.
In response to this, the delay circuit 8 connects the analog switch 7 via the control line 11. At this time, the condition is that a delay signal capable of connecting the analog switch 7 is generated after the switching noise of the delay circuit 8 is generated.

本実施例では、音声インタフェース回路と、ダイヤルパ
ルス信号送出回路を全く別の回路系として分けた構造に
なっているが、同一回路系であっても、基本的に、音声
接続中とダイヤルパルス信号送出中の状態を切り換えて
使用するものならよく、また音声系のスイッチとして半
導体アナログスイッチを用いて説明したが、同様の機能
を有するものであれば良く、さらに音声インタフェース
上で、送信、受信の信号を合成・分離しても良いことは
云うまでもない。
In this embodiment, the audio interface circuit and the dial pulse signal sending circuit are separated into completely different circuit systems, but even if they are the same circuit system, basically, the audio interface circuit and the dial pulse signal sending circuit are separated into two different circuit systems. Any switch that can be used to switch the status during transmission is acceptable. Also, although a semiconductor analog switch was used as the audio system switch in the explanation, any switch that has the same functions is sufficient. It goes without saying that signals may be combined and separated.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、二線アナログ局線から音
声信号を取り出す音声インタフェース回路の音声信号線
の接続、切断側−を、ダイヤルパルス信号送出回路と音
声インタフェース回路との切換指示がありてから所定時
間後に行うことにより、ダイヤパルス信号送出及び終了
時の雑音削減が行える効果がある。
As explained above, the present invention provides a connection/disconnection side of the audio signal line of the audio interface circuit that takes out the audio signal from the two-wire analog office line when there is an instruction to switch between the dial pulse signal sending circuit and the audio interface circuit. By performing this after a predetermined period of time, there is an effect that noise can be reduced at the time of transmitting the diamond pulse signal and ending it.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の実施例を示すブロックである。 1・・−・・・二線アナログ局線接続端子、3・・・・
・・リレースイッチ、3a・・・・・・リレースイッチ
3の接点、3b・・・・・・リレースイッチ3の接点、
4・・・・・・ダイヤルパルス信号送出回路、5・・・
・・・音声インタフェース回路、6・・・・・・音声信
号線、7・・・・・・半導体アナログスイッチ、8・・
・・・・適当な遅延回路、9・・・・・・リレ−スイッ
チ3の駆動回路、10・・・・・・す17−スイッチ3
0制御線、11・・・・・・半導体アナログスイッチ7
0制御線。
The drawing is a block diagram showing an embodiment of the invention. 1...--Two-wire analog station line connection terminal, 3...
...Relay switch, 3a...Contact of relay switch 3, 3b...Contact of relay switch 3,
4...Dial pulse signal sending circuit, 5...
...Audio interface circuit, 6...Audio signal line, 7...Semiconductor analog switch, 8...
...Appropriate delay circuit, 9...Drive circuit for relay switch 3, 10...17-switch 3
0 control line, 11...Semiconductor analog switch 7
0 control line.

Claims (1)

【特許請求の範囲】[Claims] 二線アナログ局線との音声信号インタフェースとなる音
声インタフェース回路と、ダイヤルパルス信号送出回路
と、前記二線アナログ局線を前記音声インタフェース回
路とダイヤルパルス信号送出回路のいずれか一方に接続
する切換手段とを含む二線アナログ局線インタフェース
回路において、前記切換手段で切換えが行われる時点か
ら所定時間後に、前記音声インターフェース回路をボタ
ン電話装置又は構内交換機等へ接続する手段を有する局
線インタフェース回路。
an audio interface circuit serving as an audio signal interface with a two-wire analog office line, a dial pulse signal sending circuit, and a switching means for connecting the two-wire analog office line to either the audio interface circuit or the dial pulse signal sending circuit. A two-wire analog central office line interface circuit comprising: a means for connecting the voice interface circuit to a button telephone device, a private branch exchange, etc. after a predetermined period of time from the time when switching is performed by the switching means.
JP13873485A 1985-06-25 1985-06-25 Trunk line interface circuit Pending JPS61296889A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13873485A JPS61296889A (en) 1985-06-25 1985-06-25 Trunk line interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13873485A JPS61296889A (en) 1985-06-25 1985-06-25 Trunk line interface circuit

Publications (1)

Publication Number Publication Date
JPS61296889A true JPS61296889A (en) 1986-12-27

Family

ID=15228919

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13873485A Pending JPS61296889A (en) 1985-06-25 1985-06-25 Trunk line interface circuit

Country Status (1)

Country Link
JP (1) JPS61296889A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533228A (en) * 1978-08-30 1980-03-08 Casio Comput Co Ltd Arithmetic unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533228A (en) * 1978-08-30 1980-03-08 Casio Comput Co Ltd Arithmetic unit

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