JPS5832544B2 - Facsimile control signal transmission method - Google Patents
Facsimile control signal transmission methodInfo
- Publication number
- JPS5832544B2 JPS5832544B2 JP51144962A JP14496276A JPS5832544B2 JP S5832544 B2 JPS5832544 B2 JP S5832544B2 JP 51144962 A JP51144962 A JP 51144962A JP 14496276 A JP14496276 A JP 14496276A JP S5832544 B2 JPS5832544 B2 JP S5832544B2
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- Japan
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- signal
- control signal
- transmission
- state
- level
- 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.)
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Description
【発明の詳細な説明】
本発明は画信号を3値化して伝送するファクシミリ伝送
方式に関し、特に受信側の制御のための制御信号の伝送
方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile transmission system for transmitting a ternary image signal, and more particularly to a transmission system for control signals for controlling a receiving side.
ファクシミIJ伝送において、画信号を高速で送るため
の方式の1つに多値化して伝送する方式があり、中でも
3値伝送方式が多く使われている。In facsimile IJ transmission, one of the methods for sending image signals at high speed is a multi-value transmission method, and among them, a three-value transmission method is often used.
第1図は3値伝送方式の原理を示す信号波形図で、aは
原信号である2値画信号、bはこの信号を3値化した3
値信号、Cはこの3値信号でキャリア・サプレス振幅変
調した波形、dは3値信号で周波数変調した波形である
。Figure 1 is a signal waveform diagram showing the principle of the three-value transmission system, where a is the original binary image signal, and b is the three-value image signal that is the original signal.
The value signal C is a waveform obtained by carrier suppression amplitude modulation with this ternary signal, and d is a waveform frequency modulated with the ternary signal.
画信号はCまたはdの信号形態で送られる。The image signal is sent in a C or d signal format.
ところで、ファクシミリ伝送においては画信号以外に受
信側の制御を行なうための各種の制御信号、例えば同期
信号とか、画信号の終りを示すエンド信号、あるいは全
白のラインをスキップ早送りするための信号などを送る
必要がある。By the way, in facsimile transmission, in addition to image signals, various control signals are used to control the receiving side, such as synchronization signals, end signals indicating the end of image signals, signals for skipping all white lines, and fast forwarding. need to be sent.
これらの制御信号の伝送方式として、従来では、例えば
画信号の黒信号と同様な信号をある幅をもたせて周期的
に繰返し送り、これを制御信号とする方式が考えられて
いる。Conventionally, as a transmission method for these control signals, a method has been considered in which, for example, a signal similar to a black signal of an image signal is periodically and repeatedly sent with a certain width, and this signal is used as a control signal.
しかし、この方式では本来の画信号と確実に区別するた
めには、制御信号を多数回繰返し送るが、十分な間隔(
例えば1ラインに1回ずつ)で送る必要があり、いずれ
にしてもその伝送に長時間を要し、受信側においても判
別に時間がかかる。However, in this method, in order to reliably distinguish it from the original image signal, the control signal is sent repeatedly many times, but at sufficient intervals (
For example, it needs to be sent once per line), and in any case, it takes a long time to transmit it, and it also takes time for the receiving side to make a determination.
このことは伝送効率の悪化にもつながり、多値伝送方式
の利点を損う結果となる。This also leads to deterioration of transmission efficiency, resulting in the loss of the advantages of the multilevel transmission method.
本発明はこのような点に鑑みてなされたもので、制御信
号を短時間で伝送でき、かつ画信号と明確に区別し得る
ファクシミリ制御信号を目的とする。The present invention has been made in view of these points, and an object of the present invention is to provide a facsimile control signal that can be transmitted in a short time and can be clearly distinguished from an image signal.
以下図面を参照して本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
第1図を見て分るように、3値伝送方式による伝送信号
は3つの状態があり、例えば白送り(これは第1図すの
ように3値信号でみて黒信号は常に、10“レベルで、
白信号レベルは」−//1“レベル、 tr i“レ
ベルに交互に変化させる送り方で、この逆に黒信号レベ
ルな+//1“、−、/1“K変化させる送り方を黒送
りという)の場合を考えると、その信号状態の遷移は第
2図のようになる。As you can see from Figure 1, there are three states of the transmission signal using the ternary transmission method, for example, white feed (this means that when looking at the ternary signal as shown in Figure 1, the black signal is always 10" At the level,
The white signal level is sent by alternating between "-//1" level and tri" level, and conversely, the black signal level is sent by changing +//1", -, /1"K. If we consider the case of "transmission", the transition of the signal state is as shown in Fig. 2.
第1図Cを対応させると、0相キヤリアの部分が第1の
状態A、π相キャリヤの部分が第2の状態C、キャリア
無しの部分が第3の状態B1.B2に相当する。When FIG. 1C is made to correspond, the 0-phase carrier part is in the first state A, the π-phase carrier part is in the second state C, and the part without carrier is in the third state B1. Corresponds to B2.
同様に第1図dはflがA、f3がC1f2がBI、B
2 に相当する。Similarly, in Fig. 1 d, fl is A, f3 is C1, f2 is BI, B
Equivalent to 2.
このように3値方式は信号状態(第1図すの3値信号で
はレベル状態)がA、B(B1.B2)。In this way, in the ternary system, the signal states (level states in the ternary signal shown in Figure 1) are A, B (B1, B2).
Cと3つあり、(状態遷移図では4状態)その状態遷移
はA−4−B→C→B→A→B→Cのようになる。There are three states (in the state transition diagram, there are 4 states), and the state transition is as follows: A-4-B→C→B→A→B→C.
、AとCの間の直接の遷移は帯域制限により伝送不能で
ある。, A and C cannot be transmitted due to band limitations.
これに対し、A−’B→A→とか、C−)B−+Cの状
態遷移は伝送可能ではあるが、画信号の伝送には禁じら
れている。On the other hand, state transitions such as A-'B→A→ and C-)B-+C can be transmitted, but are prohibited for transmitting image signals.
本発明はこのようにA→B−→AまたはC−+B→Cの
状態遷移が画信号の伝送には禁じられていることを利用
し、この状態遷移を制御信号の伝送に利用しようとする
ものである。The present invention utilizes the fact that the state transition of A→B-→A or C-+B→C is prohibited for image signal transmission, and attempts to utilize this state transition for control signal transmission. It is something.
ところでA→B−+AまたはC→B→Cの遷移は伝送中
に混入する雑音によっても起り得る。Incidentally, the transition from A→B−+A or C→B→C may also occur due to noise mixed in during transmission.
この様子を第3図の受信側復調波形(3値信号)に示す
。This situation is shown in the demodulated waveform (ternary signal) on the receiving side in FIG.
すなわち雑音N1 によりA−+B−)Aの状態遷移
(+7.]″→7,0“→+//1“のレベル遷移)が
現れ、雑音N2 によりC→B→Cの状態遷移(−77
1“→、 Q //→−7,1“のレベル遷移)が現れ
ている。In other words, the noise N1 causes a state transition of A-+B-)A (level transition of +7.]''→7,0"→+//1"), and the noise N2 causes a state transition of C→B→C (-77.
1"→, Q //→-7,1" level transition) appears.
このような雑音による信号状態の遷移は一般に時間が短
く、また規則性もなく短時間の間に連続して現れること
はない。Such signal state transitions due to noise generally occur over a short period of time, and are not regular and do not occur continuously over a short period of time.
したがって制御信号の伝送には、例えば第4図aのよう
にA→B→A(またC−+B→C)の1回の状態遷移を
一定時間以」二かげて送ったり、あるいは第4図すのよ
うにA−=B−”A−’B→A−’B→A(またはC→
B→C→B→C→B−+C)とA、B間(C,B間)の
状態遷移を複数回例えば3〜4回程度繰返し送るように
すれば、雑音によるものと容易に区別がつく。Therefore, to transmit the control signal, for example, one state transition of A→B→A (or C-+B→C) may be sent twice for a certain period of time as shown in FIG. 4a, or As in A-=B-”A-'B→A-'B→A (or C→
If the state transition between B→C→B→C→B−+C) and between A and B (between C and B) is sent multiple times, for example, about 3 to 4 times, it can be easily distinguished from noise. arrive.
次に本発明を適用した装置の具体例を説則する。Next, a specific example of an apparatus to which the present invention is applied will be explained.
第5図は本発明方式に基づく送信側の回路構成の一例を
示したもので、第6図はその各部波形図である。FIG. 5 shows an example of the circuit configuration on the transmitting side based on the method of the present invention, and FIG. 6 is a waveform diagram of each part thereof.
aは伝送ずろ信号を3値と2値とに切換えるための信号
で、3値伝送の場合7,1“、2値伝送の場合、 Q
//となる。a is a signal for switching the transmission error signal between 3-value and 2-value, and in the case of 3-value transmission, it is 7,1", and in the case of binary transmission, Q
// becomes.
bは伝送する信号を補信号と制御信号とに切換えるため
の信号で、制御信号をすべて第4図に示l〜たような2
値信号の形で送る場合は、この信号すは第6図のように
aと同じでよい。b is a signal for switching the signal to be transmitted into a supplementary signal and a control signal, and all control signals are converted into two signals as shown in Fig. 4.
If it is sent in the form of a value signal, this signal may be the same as a as shown in FIG.
Cは2値の人力画信号、dは人力制御信号である。C is a binary human-powered image signal, and d is a human-powered control signal.
11はインバータ、12,13はANDゲート・、14
はNORゲートで、NORゲート14の出力eには信号
すに応じて画信号Cと制御信号dとが時間区分されて現
れる。11 is an inverter, 12 and 13 are AND gates, 14
is a NOR gate, and an image signal C and a control signal d appear at the output e of the NOR gate 14 in a time-divided manner according to the signal 14.
ただし、極性は反転している。However, the polarity is reversed.
15はJ−にフリップフロップで、J、に端子の状態、
つまり信号aが771″のときは、Cp端子に与えられ
ているNORゲート14の出力eの立下り点ごとに反転
し1.、 Q //のときは反転しない。15 is a flip-flop at J-, the state of the terminal at J,
That is, when the signal a is 771'', it is inverted at every falling point of the output e of the NOR gate 14 applied to the Cp terminal, and when it is 1., it is not inverted.
したがって、そのQ出力はfのようになる。Therefore, its Q output becomes f.
16.17はJ−にフリップフロップ15のQおよびQ
出力によりそれぞれ制御されて、NORゲート14の出
力eのうち例えば771 //レベルにすべき部分と+
//1“レベルにすべき部分とを分けて取出すANDゲ
ートで、その出力はそれぞれg、hのようになる。16.17 is the Q and Q of flip-flop 15 to J-
For example, a portion of the output e of the NOR gate 14 that should be at the 771 // level and a portion of the output e of the NOR gate 14 are controlled by the outputs.
//1" This is an AND gate that separately takes out the part that should be at the level, and its outputs will be g and h, respectively.
制御信号の成分はここでは信号gの方に含まれているが
JKフリップフロップの状態によってはhの方へ含まれ
ることもある。Although the control signal component is included in the signal g here, it may also be included in the signal h depending on the state of the JK flip-flop.
これら信号g、hは演算増幅器18の反転入力端子およ
び非反転入力端子にそれぞれ加えられる。These signals g and h are applied to an inverting input terminal and a non-inverting input terminal of operational amplifier 18, respectively.
これにより演算増幅器18の出力iには、gが、71“
でhが、70“のとき//1“レベル、gが、 Q /
/でbが、71“のとき+ u 1“レベル、g、hが
ともに7,0“レベルのとき/10“レベルとなる信号
が得られ、これが伝送信号となる。As a result, the output i of the operational amplifier 18 has g of 71"
When h is 70"//1" level, g is Q/
When b is 71", the level is +u 1", and when g and h are both 7,0", the signal is /10", and this becomes the transmission signal.
すなわち、伝送信号は両信号のところでは〃0“レベル
をはさんで交互に干、、 1 u、、 1 //レベル
に変化するが、制御信号のところでは、70“レベルと
−771“レベルとの間を往復している。In other words, the transmission signal alternately changes from 0 to 1 // level at both signals, but at the control signal it changes to 70 and -771 levels. I am traveling back and forth between the two.
この伝送信号は実際にはさらに変調器に導かれ、振幅変
調波(キャリアザブレスでもよい)また周波数変調波の
形で伝送される。This transmission signal is actually further guided to a modulator and transmitted in the form of an amplitude modulated wave (carrier the breath may also be used) or a frequency modulated wave.
次に受信側について説明する。Next, the receiving side will be explained.
第7図は本発明方式に基づく受信側の回路構成の一例(
第5図に対応)を示したもので、第8図はその各部波形
図である。FIG. 7 shows an example of the circuit configuration on the receiving side based on the method of the present invention (
(corresponding to FIG. 5), and FIG. 8 is a waveform diagram of each part thereof.
3値信号に復調された受信信号aはレベル判定回路21
,22に与えられる。The received signal a demodulated into a ternary signal is sent to a level determination circuit 21
, 22.
レベル判定回路21は入力レベルが+tt 1 ” /
2より大きい場合に出力力団コるように構成され、レ
ベル判定回路22は人力レベルが−7,1″/2より小
さい場合に出力が出るように構成されており、そ、の出
力波形はす、cのようになる。The level determination circuit 21 has an input level of +tt 1 ”/
The level determination circuit 22 is configured to output an output when the human power level is less than -7,1''/2, and the output waveform is as follows. It becomes like c.
これらの出力をNORゲート23に加えると、jに示す
ように2値の両信号と制御信号とが得られ、これは図示
してない記録部に記録信号として導かれる。When these outputs are applied to the NOR gate 23, two binary signals and a control signal are obtained as shown in j, which is led to a recording section (not shown) as a recording signal.
22.25はレベル判定回路2L22の出力bycの立
下り点をそれぞれ検出する回路で、その出力波形はdy
eとなる。22 and 25 are circuits that detect the falling points of the output byc of the level determination circuit 2L22, and the output waveform is dy
It becomes e.
26は立下り点検出回路24の出力dの立下りでセット
され、立下り点検出回路25の出力eの立下りでリセッ
トされるセット−リセット・フリップフロップで、その
Q出力はfのようになる。26 is a set-reset flip-flop that is set at the falling edge of the output d of the falling point detection circuit 24 and reset at the falling edge of the output e of the falling point detection circuit 25, and its Q output is as shown in f. Become.
27.28はそれぞれフリップフロップのQおよびq出
力と、レベル判定回路21,22の出力す、cを入力と
するANDゲートで、この各ANDゲート27゜28の
出力をORゲート29に加えると、受信信号aのうち、
画信号の3値化の規則から外れたgに示すパターンの信
号が得られる。27 and 28 are AND gates whose inputs are the Q and q outputs of the flip-flops and the outputs 2 and 2 of the level determination circuits 21 and 22, and when the outputs of the AND gates 27 and 28 are added to the OR gate 29, Of the received signal a,
A signal having a pattern shown in g, which deviates from the rules for ternarizing image signals, is obtained.
また30゜31はそれぞれフリップフロップ26のQお
よびQ出力と、レベル判定回路22,21の出力す。30.degree. and 31 are the Q and Q outputs of the flip-flop 26 and the outputs of the level determination circuits 22 and 21, respectively.
Cとを入力をするANDゲートで、この各ANDゲート
30,310出力をNORゲート32に加えると、受信
信号aのうち、画信号の3値化の規則に合ったhに示す
パターンの信号が得られる。When the outputs of the AND gates 30 and 310 are added to the NOR gate 32, a signal of the pattern shown in h, which conforms to the rules for ternarizing image signals, is obtained from the received signal a. can get.
33は制御信号検知回路で、ORゲート290出力gの
パターンを調べて、このパターンが雑音(例えば第8図
aKNで示される)によるものか否かを判定して制御信
号を検知する回路で、NORゲート32の出力りはリセ
ットに使用される。33 is a control signal detection circuit which detects a control signal by examining the pattern of the output g of the OR gate 290 and determining whether or not this pattern is due to noise (for example, indicated by aKN in FIG. 8); The output of NOR gate 32 is used for reset.
例えばこの例では、制御信号検知回路33としてはカウ
ンタが使用され、ORゲート29の出力gのパルス数を
3個までカウントしたとき、iに示す検出出力を出すよ
うに構成されている。For example, in this example, a counter is used as the control signal detection circuit 33, and is configured to output a detection output indicated by i when the number of pulses of the output g of the OR gate 29 is counted up to three.
この検出出力は前述したように、例えば同期信号として
用いてもよいし、あるいはエンド信号、スキップ早送り
信号などに用いることもできる。As described above, this detection output may be used, for example, as a synchronization signal, or as an end signal, a skip fast-forward signal, or the like.
以上説明したように、本発明は画信号を信号状態が第3
の状態をはさんで第1および第2の状態に変化する信号
形態で伝送するファクシミIJ伝送方式において、伝送
する信号形態を、上記画信号の伝送時の規則から外れた
形、すなわち第1および第2の状態の一方の状態と第3
の状態との間で少なくとも1回往復させた形とし、この
往復した部分を制御信号として伝送するものである。As explained above, in the present invention, the signal state of the image signal is
In the facsimile IJ transmission method in which the signal form is transmitted in a signal form that changes between the first and second states, the signal form to be transmitted is deviated from the rules for transmitting the image signal, that is, the first and second states. one state of the second state and the third state
It is configured such that it makes at least one round trip between the two states, and this round trip portion is transmitted as a control signal.
すなわち、本発明によれば伝送する制御信号はパターン
そのものが画信号の3値化の規則と外れていることから
、画信号との区別を即座に行なうことができる。That is, according to the present invention, since the pattern itself of the control signal to be transmitted deviates from the rules for ternarization of image signals, it is possible to immediately distinguish it from the image signal.
このため、制御信号は従来方式のように画信号との区別
のために必要以上に何回も繰返し送ったり1.長い間隔
で送る必要はなく、雑音と区別し得る程度に、繰返し回
数あるいは信号状態の1往復の遷移に要する時間を選べ
ばよい。For this reason, as in the conventional system, the control signal is sent more times than necessary in order to distinguish it from the image signal.1. It is not necessary to send the signal at long intervals, and the number of repetitions or the time required for one round trip of the signal state may be selected to the extent that it can be distinguished from noise.
したがって、制御信号の伝送時間を短縮でき、伝送効率
の向上に寄与することができる。Therefore, the transmission time of control signals can be shortened, contributing to improvement in transmission efficiency.
第1図は3値伝送方式の原理を示す波形図、第2図は3
値伝送方式におげろ画信号の状態遷移を示す図、第3図
は3値信号に雑音が混入した場合の波形図、第4図は本
発明方式による制御信号の例を示す波形図、第5図は本
発明方式に基づく送信側の回路構成例を示す図、第6図
は第5図の各部の波形図、第7図は本発明方式に基づく
受信側の回路構成例を示す図、第8図は第7図の各部の
波形図である。
11・・・・・・インバータ、12,13,16,17
゜27.28,30,31・・・・・・ANDゲート、
14゜23.32・・・・・・NORゲート、15・
・・・・・J−にフリップフロップ、18・・・・・・
増幅器、21,22・・・・・・レベル判定回路、24
.25・・・・・・立下り点検出回路、26・・・・・
・セット−リセット・フリップフロップ、29・・・・
・・ORゲート、33・・・・・・制御信号検知回路。Figure 1 is a waveform diagram showing the principle of the three-value transmission method, and Figure 2 is a waveform diagram showing the principle of the three-level transmission method.
FIG. 3 is a waveform diagram when noise is mixed into the ternary signal; FIG. 4 is a waveform diagram showing an example of a control signal according to the method of the present invention; FIG. FIG. 5 is a diagram showing an example of the circuit configuration on the transmitting side based on the method of the present invention, FIG. 6 is a waveform diagram of each part of FIG. 5, and FIG. 7 is a diagram showing an example of the circuit configuration on the receiving side based on the method of the present invention. FIG. 8 is a waveform diagram of each part of FIG. 7. 11... Inverter, 12, 13, 16, 17
゜27.28,30,31...AND gate,
14゜23.32...NOR gate, 15.
...Flip-flop on J-, 18...
Amplifier, 21, 22...Level judgment circuit, 24
.. 25... Falling point detection circuit, 26...
・Set-reset flip-flop, 29...
...OR gate, 33...control signal detection circuit.
Claims (1)
び第2の状態に交互に変化する信号形態で伝送するファ
クシミリ伝送方式において、伝送する信号形態を上記第
1および第2の状態の一方の状態と第3の状態との間で
少なくとも1回往復させ、この往復した部分を制御信号
として伝送することを特徴とするファクシミリ制御信号
伝送方式。1. In a facsimile transmission system in which an image signal is transmitted in a signal form in which the signal state alternately changes between the first and second states with a third state in between, the signal form to be transmitted is in the first and second states. A facsimile control signal transmission system characterized in that the facsimile control signal is transmitted at least once between one state and a third state, and the reciprocated portion is transmitted as a control signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51144962A JPS5832544B2 (en) | 1976-12-02 | 1976-12-02 | Facsimile control signal transmission method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51144962A JPS5832544B2 (en) | 1976-12-02 | 1976-12-02 | Facsimile control signal transmission method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5368907A JPS5368907A (en) | 1978-06-19 |
JPS5832544B2 true JPS5832544B2 (en) | 1983-07-13 |
Family
ID=15374237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP51144962A Expired JPS5832544B2 (en) | 1976-12-02 | 1976-12-02 | Facsimile control signal transmission method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5832544B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61120958U (en) * | 1985-01-09 | 1986-07-30 | ||
JPS61189352U (en) * | 1985-05-14 | 1986-11-26 | ||
JPS62109255U (en) * | 1985-12-27 | 1987-07-11 | ||
JPH0431631Y2 (en) * | 1984-11-08 | 1992-07-29 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3135243B2 (en) * | 1989-11-28 | 2001-02-13 | キヤノン株式会社 | Image data transmission / reception method and apparatus used therefor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50142113A (en) * | 1974-05-04 | 1975-11-15 |
-
1976
- 1976-12-02 JP JP51144962A patent/JPS5832544B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50142113A (en) * | 1974-05-04 | 1975-11-15 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0431631Y2 (en) * | 1984-11-08 | 1992-07-29 | ||
JPS61120958U (en) * | 1985-01-09 | 1986-07-30 | ||
JPS61189352U (en) * | 1985-05-14 | 1986-11-26 | ||
JPS62109255U (en) * | 1985-12-27 | 1987-07-11 |
Also Published As
Publication number | Publication date |
---|---|
JPS5368907A (en) | 1978-06-19 |
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