JPH0690300A - Facsimile modem - Google Patents
Facsimile modemInfo
- Publication number
- JPH0690300A JPH0690300A JP4095131A JP9513192A JPH0690300A JP H0690300 A JPH0690300 A JP H0690300A JP 4095131 A JP4095131 A JP 4095131A JP 9513192 A JP9513192 A JP 9513192A JP H0690300 A JPH0690300 A JP H0690300A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- cng
- ced
- called station
- sent
- 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.)
- Withdrawn
Links
Landscapes
- Facsimile Transmission Control (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はファクシミリモデムに関
し、特に通信手順信号の処理機能を有するファクシミリ
モデムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile modem, and more particularly to a facsimile modem having a communication procedure signal processing function.
【0002】[0002]
【従来の技術】従来のファクシミリモデムは図2に示す
ように、電話回線11が接続される回線インタフェース
21を介してファクシミリモデム22および正弦波2値
化回路24が接続される。正弦波2値化回路24は検出
パルス15をホストCPU25に出力する。制御バス1
4によりホストCPU25で制御されるファクシミリモ
デム22は内部に正弦波発生器3を有している。2. Description of the Related Art In a conventional facsimile modem, as shown in FIG. 2, a facsimile modem 22 and a sine wave binarization circuit 24 are connected via a line interface 21 to which a telephone line 11 is connected. The sine wave binarization circuit 24 outputs the detection pulse 15 to the host CPU 25. Control bus 1
The facsimile modem 22 controlled by the host CPU 25 by means of 4 has a sine wave generator 3 inside.
【0003】次に従来例の動作について説明する。ファ
クシミリ装置の通信手順における着信時(フェーズA)
において、被呼局側のファクシミリモデム22は制御バ
ス14を介してホストCPU5の制御コマンドにより、
ファクシミリモデム22内の正弦波発生器3を駆動し、
2100Hzの被呼局識別(CED)信号を発呼局に向
けて手順信号12として回線インタフェース1を介して
電話回線11に送出する。Next, the operation of the conventional example will be described. At the time of an incoming call in the communication procedure of the facsimile machine (Phase A)
At the called station side, the facsimile modem 22 receives a control command from the host CPU 5 via the control bus 14.
Drive the sine wave generator 3 in the facsimile modem 22,
A 2100 Hz called station identification (CED) signal is sent to the calling station as a procedure signal 12 through the line interface 1 to the telephone line 11.
【0004】一方、発呼局側からはフェーズAにおいて
1100Hzの呼び出し音(CNG)信号が送出され
る。CNG信号は、自動発呼端末では必須で呼接続後3
秒間隔で0.5秒連続した1100Hzの信号が被呼局
に送出される。これは回線インタフェース21を介して
CNG信号が検出手順信号13として正弦波2値化回路
24に入力され、周波数成分をホストCPU5の監視の
もと検出パルス15として表示していた。On the other hand, in the phase A, a ringing tone (CNG) signal of 1100 Hz is transmitted from the calling station side. The CNG signal is indispensable for the automatic calling terminal, and 3 after call connection.
A 1100 Hz signal that continues for 0.5 seconds at an interval of 2 seconds is sent to the called station. The CNG signal is input to the sine wave binarization circuit 24 as the detection procedure signal 13 via the line interface 21, and the frequency component is displayed as the detection pulse 15 under the supervision of the host CPU 5.
【0005】[0005]
【発明が解決しようとする課題】この従来のファクシミ
リモデムでは、フェーズAにおける被呼局からのCED
信号と発呼局からのCNG信号とが、ほぼ同時に発せら
れるので、被呼局のファクシミリモデムでCEDを送信
している間は、発呼局からのCNG信号が検出できない
構成なので、ファクシミリ装置内のファクシミリモデム
外に到来するCNG信号を検出する外部回路すなわち、
CNG信号の正弦波検出器を設けてやる必要があった。In this conventional facsimile modem, the CED from the called station in phase A is used.
Since the signal and the CNG signal from the calling station are emitted almost at the same time, the CNG signal from the calling station cannot be detected while the CED is being transmitted by the facsimile modem of the called station. External circuit that detects the CNG signal arriving outside the facsimile modem of
It was necessary to provide a sine wave detector for the CNG signal.
【0006】また、ホストCPUがフェーズAのとき到
来する2値化されたCNG信号を検出パルスとして自ら
のタイマーを基準とした検出パルス数のカウト値により
CNG信号であることを判定しなければならずホストC
PUの負荷が過大になるという欠点があった。Further, the host CPU has to judge that it is a CNG signal by using the binarized CNG signal arriving at phase A as a detection pulse and the cout value of the number of detection pulses based on its own timer. Host C
There is a drawback that the load on the PU becomes excessive.
【0007】[0007]
【課題を解決するための手段】本発明のファクシミリモ
デムは、CCITT勧告T.30で規定される通信制御
手順に従って着信時に電話回線に送出する被呼局識別信
号を発生する発振回路と、前記被呼局識別信号が送出さ
れる前記電話回線から受信の呼び出し音信号を出力する
回線インタフェースからの前記被呼局識別信号を阻止し
前記呼び出し音信号を通過させるフィルタと、このフィ
ルタの出力から前記呼び出し信号を検出する検出器とを
有する。The facsimile modem of the present invention is based on CCITT Recommendation T.264. An oscillator circuit for generating a called station identification signal to be sent to a telephone line when an incoming call is received in accordance with a communication control procedure defined by 30 and a reception ringing signal from the telephone line to which the called station identification signal is sent are output. It has a filter for blocking the called station identification signal from the line interface and passing the ringing tone signal, and a detector for detecting the ringing signal from the output of this filter.
【0008】[0008]
【実施例】次に本発明について図面を参照して説明す
る。図1は本発明の一実施例のブロック図である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention.
【0009】本実施例は、CCITT勧告T.30で規
定される通信制御手順に従って着信時に電話回線11に
送出する被呼局識別(CED)信号を発生する正弦波発
生器3と、被呼局識別信号が送出される電話回線11か
ら受信の呼び出し音(CNG)信号を出力する回線イン
タフェース1からの被呼局識別信号を阻止し呼び出し音
信号を通過させるノッチフィルタ4と、フィルタ4の出
力から呼び出し信号を検出する正弦波検出器5とを有し
て構成される。This embodiment is based on CCITT Recommendation T.264. A sine wave generator 3 for generating a called station identification (CED) signal to be sent to a telephone line 11 when receiving a call according to a communication control procedure defined by 30 and a telephone line 11 for receiving a called station identification signal. A notch filter 4 that blocks the called station identification signal from the line interface 1 that outputs a ringing tone (CNG) signal and passes the ringing tone signal, and a sine wave detector 5 that detects the ringing signal from the output of the filter 4 are provided. Configured to have.
【0010】次に本実施例の動作について説明する。被
呼側のファクシミリモデム2はファクシミリ装置の通信
手順のうちのフェーズAにおいて、ホストCPU6の制
御コマンドにより制御バス14を介して正弦波発生器3
を駆動し、CED信号として2100Hzを発生させ
る。CED信号は手順信号12として回線インタフェー
ス1を介して電話回線11へ送出される。一方、同じフ
ェーズAにおいて、発呼局からはCNG信号が回線イン
タフェース1を介して3秒間隔で0.5秒連続の110
0Hzの信号が検出手順信号13として送出される。同
時に入力されるCEDおよびCNG信号をファクシミリ
モデム2内のノッチフィルタ4によってCED信号の2
100Hz成分を除去し、正弦波検出器5に出力する。
これによりCNG信号の1100Hzの成分を検出する
ことができ、ファクシミリモデム2内のこの検出結果を
ホストCPU6が制御バス14を介して適当なタイミン
グで監視して全二重動作でCED信号の送出中であって
もCNG信号の検出を行なうことができる。Next, the operation of this embodiment will be described. In the phase A of the communication procedure of the facsimile apparatus, the called facsimile modem 2 receives the sine wave generator 3 via the control bus 14 by the control command of the host CPU 6.
Is driven to generate 2100 Hz as a CED signal. The CED signal is sent as a procedure signal 12 to the telephone line 11 via the line interface 1. On the other hand, in the same phase A, the CNG signal from the calling station is transmitted through the line interface 1 at intervals of 3 seconds for 0.5 seconds in succession 110.
A 0 Hz signal is sent out as the detection procedure signal 13. The CED and CNG signals input at the same time are input to the CED signal 2 by the notch filter 4 in the facsimile modem 2.
The 100 Hz component is removed and output to the sine wave detector 5.
As a result, the 1100 Hz component of the CNG signal can be detected, and the detection result in the facsimile modem 2 is monitored by the host CPU 6 at an appropriate timing via the control bus 14 to transmit the CED signal in the full-duplex operation. Even in this case, the CNG signal can be detected.
【0011】[0011]
【発明の効果】以上説明したように本発明は、着信時に
電話回線に送出する被呼局識別信号を発生する発振回路
と、前記被呼局識別信号が送出される前記電話回線から
受信の呼び出し音信号を出力する回線インタフェースか
らの前記被呼局識別信号を阻止し前記呼び出し音信号を
通過させるフィルタと、このフィルタからの出力から前
記呼び出し信号を検出する検出器とを有することによ
り、CED信号の送出中に受信のCNG信号を検出する
ことができる。また、CPUではCNG信号の検出処理
の負荷が軽減される。As described above, according to the present invention, an oscillating circuit for generating a called station identification signal to be sent to a telephone line when a call is received, and a reception call from the telephone line to which the called station identification signal is sent. The CED signal is provided by including a filter that blocks the called station identification signal from the line interface that outputs a tone signal and passes the ringing tone signal, and a detector that detects the ringing signal from the output from this filter. It is possible to detect the received CNG signal during transmission of the. Further, the load of the CNG signal detection processing is reduced in the CPU.
【図1】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図2】従来のファクシミリモデムの一例のブロック図
である。FIG. 2 is a block diagram of an example of a conventional facsimile modem.
1 回線インタフェース 2 ファクシミリモデム 3 正弦波発生器 4 ノッチフィルタ 5 正弦波検出器 6 ホストCPU 11 電話回線 12 手順信号 13 検出手順信号 14 制御バス 1 line interface 2 facsimile modem 3 sine wave generator 4 notch filter 5 sine wave detector 6 host CPU 11 telephone line 12 procedure signal 13 detection procedure signal 14 control bus
Claims (1)
信制御手順に従って着信時に電話回線に送出する被呼局
識別信号を発生する発振回路と、前記被呼局識別信号が
送出される前記電話回線から受信の呼び出し音信号を出
力する回線インタフェースからの前記被呼局識別信号を
阻止し前記呼び出し音信号を通過させるフィルタと、こ
のフィルタの出力から前記呼び出し信号を検出する検出
器とを有することを特徴とするファクシミリモデム。1. CCITT Recommendation T. An oscillator circuit for generating a called station identification signal to be sent to a telephone line when an incoming call is received in accordance with a communication control procedure defined by 30 and a reception ringing signal from the telephone line to which the called station identification signal is sent are output. A facsimile modem comprising: a filter for blocking the called station identification signal from a line interface and passing the ringing tone signal; and a detector for detecting the ringing signal from the output of this filter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4095131A JPH0690300A (en) | 1992-04-15 | 1992-04-15 | Facsimile modem |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4095131A JPH0690300A (en) | 1992-04-15 | 1992-04-15 | Facsimile modem |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0690300A true JPH0690300A (en) | 1994-03-29 |
Family
ID=14129273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4095131A Withdrawn JPH0690300A (en) | 1992-04-15 | 1992-04-15 | Facsimile modem |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0690300A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015170862A (en) * | 2014-03-04 | 2015-09-28 | キヤノン株式会社 | Image communication device, method of controlling the same and program |
-
1992
- 1992-04-15 JP JP4095131A patent/JPH0690300A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015170862A (en) * | 2014-03-04 | 2015-09-28 | キヤノン株式会社 | Image communication device, method of controlling the same and program |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990706 |