JPS6133492B2 - - Google Patents
Info
- Publication number
- JPS6133492B2 JPS6133492B2 JP55088623A JP8862380A JPS6133492B2 JP S6133492 B2 JPS6133492 B2 JP S6133492B2 JP 55088623 A JP55088623 A JP 55088623A JP 8862380 A JP8862380 A JP 8862380A JP S6133492 B2 JPS6133492 B2 JP S6133492B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- signal level
- sending
- level
- transmission line
- 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.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 29
- 238000005259 measurement Methods 0.000 claims description 26
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00095—Systems or arrangements for the transmission of the picture signal
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Facsimile Transmission Control (AREA)
Description
【発明の詳細な説明】
本発明は送信機の送出信号レベルの調整を簡易
に行なえるようにしたフアクシミリ装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile device that allows the level of a signal sent out by a transmitter to be easily adjusted.
フアクシミリ装置において、画信号は送信機か
ら受信機に伝送する間に伝送回線および交換機等
で減衰を起こし、このため受信機における着信レ
ベルは非常に低くなる。このような画信号のレベ
ル低下は、SN比を低下させて再生画像の画質劣
化の原因となり、好ましくない。そこで、一般に
は送信機の送出信号レベルを増大させることによ
り着信レベルを高め、画質の向上をはかつてい
る。しかしながら、送信機の送出信号レベルは、
交換機の仕様や通信回線における漏話を防止する
必要から上限が規定されており、このため送信機
の送出信号レベルを高める場合には交換機の入力
信号レベルが所定値を超えないように調整しなけ
ればならない。 In a facsimile apparatus, an image signal is attenuated in transmission lines, exchanges, etc. while being transmitted from a transmitter to a receiver, and as a result, the incoming signal level at the receiver becomes extremely low. Such a decrease in the level of the image signal is undesirable because it lowers the SN ratio and causes deterioration in the quality of the reproduced image. Therefore, in general, the incoming call level is increased by increasing the signal level sent out by the transmitter, thereby improving the image quality. However, the transmitter's output signal level is
Upper limits are specified due to the specifications of switching equipment and the need to prevent crosstalk in communication lines. Therefore, when increasing the transmitter's output signal level, the input signal level of the switching equipment must be adjusted so that it does not exceed a specified value. It won't happen.
そこで、従来では交換機側から送信機に対して
測定用信号を送出し、送信機側においてその着信
レベルを測定することによりそのときの伝送損失
を求め、この伝送損失に基づいて送信機の送出信
号レベルの調整を行なつている。このため、調整
を行なう毎に送信機の設置場所にレベル計やオシ
ロスコープ等の測定機器を運搬しなければなら
ず、作業が煩雑化するとともに調整に時間を要し
ていた。 Therefore, conventionally, the exchange side sends a measurement signal to the transmitter, the transmitter side measures the incoming signal level to determine the transmission loss at that time, and based on this transmission loss, the transmitter sends a signal. Adjusting levels. For this reason, measurement equipment such as a level meter and an oscilloscope must be transported to the location where the transmitter is installed each time an adjustment is performed, making the work complicated and requiring time for adjustment.
本発明は上記事情に着目してなされたもので、
その目的とするところは、フアクシミリ送信機の
送出信号レベルの調整を極めて簡単かつ迅速に行
ない得るフアクシミリ装置を供給することにあ
る。 The present invention has been made focusing on the above circumstances,
The object is to provide a facsimile device which allows the level of the output signal of a facsimile transmitter to be adjusted very simply and quickly.
以下、本発明を図面に示す一実施例を参照して
説明する。第１図は同実施例におけるフアクシミ
リ装置の概略構成図で、図中１は基準発振器を示
している。この基準発振器１で発生された基準信
号は分周器２で所定の搬送波周波数に分周された
のち低域通過フイルタ（LPF）３により正弦波に
変換され、搬送波として変調器４に供給される。
一方、原画５面を読取回路６で走査して得た読取
信号は、波形整形回路７で原画の黒白に応じて波
形整形されたのち、画信号として前記変調器４に
導びかれる。この結果、前記搬送波は変調器４で
上記画信号により変調され、被変調波として増幅
器８で増幅されたのち半固定抵抗減衰器
（ATT）９に供給される。そして、この半固定抵
抗減衰器９により信号レベルの制御を受けたのち
切換スイツチSW１を介して伝送回線１０に送出
される。なお、図中１１は図示しない交換器や受
信側を呼び出すための電話機である。 Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a schematic diagram of the facsimile apparatus according to the same embodiment, and numeral 1 in the figure indicates a reference oscillator. The reference signal generated by the reference oscillator 1 is divided into a predetermined carrier frequency by a frequency divider 2, converted to a sine wave by a low-pass filter (LPF) 3, and supplied to a modulator 4 as a carrier wave. .
On the other hand, a read signal obtained by scanning the five original images by a reading circuit 6 is waveform-shaped by a waveform shaping circuit 7 according to the black and white of the original image, and then guided to the modulator 4 as an image signal. As a result, the carrier wave is modulated by the image signal by the modulator 4, amplified by the amplifier 8 as a modulated wave, and then supplied to a semi-fixed resistance attenuator (ATT) 9. After the signal level is controlled by the semi-fixed resistance attenuator 9, it is sent to the transmission line 10 via the changeover switch SW1. In addition, numeral 11 in the figure is a telephone set for calling an exchange (not shown) or a receiving side.
ところで、前記分周器２には分周比を変更する
ための切換スイツチSW２が設けてあり、また変
調器４には変調波入力を選択するための切換スイ
ツチ切換SW３が設けてある。これらの切換スイ
ツチSW２，SW３は、被変調波の送出信号レベ
ルを調整する際に送出信号レベル測定用の信号を
発生させて伝送回線１０に送出するためのもの
で、連動して切換わるようになつている。例え
ば、送出信号レベル測定時に切換スイツチSW２
を閉成するとともに切換スイツチSW３を電源１
２側へ切換えると、分周器２の分周比が変更され
て画信号伝送時の前記搬送波とは周波数の異なる
特定周波数の信号が変調器４に供給される。 By the way, the frequency divider 2 is provided with a changeover switch SW2 for changing the frequency division ratio, and the modulator 4 is provided with a changeover switch SW3 for selecting the modulated wave input. These switches SW2 and SW3 are for generating a signal for measuring the sending signal level and sending it to the transmission line 10 when adjusting the sending signal level of the modulated wave, and are switched in conjunction with each other. It's summery. For example, when measuring the output signal level, selector switch SW2
and switch SW3 to power supply 1.
When the frequency divider 2 is switched to the 2 side, the frequency division ratio of the frequency divider 2 is changed, and a signal of a specific frequency different in frequency from the carrier wave during image signal transmission is supplied to the modulator 4.
ここで、この特定周波数の値は、前記伝送回線
１０の伝送損失が最小となる周波数、例えば電話
回線では1500Hzに定められるようになつている。
この特定周波数の信号は切換スイツチSW３を介
して供給される直流電圧により変調され、第２図
に示す如く前記切換スイツチSW２が電源１２側
に切換わつている限り信号レベルの一定な連続波
となつて出力される。この連続波は、送出信号レ
ベル測定信号として前記増幅器８および半固定抵
抗減衰器９でレベル設定されたのち、切換スイツ
チSW１を介して伝送回線１０に送出される。な
お、このとき切換スイツチSW１がフアクシミリ
装置側に切換わつていることは当然である。 Here, the value of this specific frequency is determined to be the frequency at which the transmission loss of the transmission line 10 is minimum, for example, 1500 Hz for a telephone line.
This specific frequency signal is modulated by the DC voltage supplied via the changeover switch SW3, and becomes a continuous wave with a constant signal level as long as the changeover switch SW2 is switched to the power supply 12 side, as shown in FIG. is output. The level of this continuous wave is set as a sending signal level measurement signal by the amplifier 8 and the semi-fixed resistance attenuator 9, and then sent to the transmission line 10 via the changeover switch SW1. Incidentally, at this time, it is natural that the changeover switch SW1 is switched to the facsimile device side.
次に、このような構成の作用を送出信号レベル
の調整手順に従つて説明する。先ず、電話機１１
により交換機（図示せず）を呼び出してフアクシ
ミリ装置と交換との間を接続し、しかるのち切換
スイツチSW１をフアクシミリ装置側に切換え
る。そして、切換スイツチSW２およびSW３を
送出信号レベル調整用側に設定し、先に述べた送
出信号レベル測定信号を伝送回線１０へ送出す
る。一方、交換機側において伝送回線１０を介し
て伝送された上記送出信号レベル測定信号の着信
レベルをレベル計により測定する。そして、その
着信レベルと交換機における入力信号レベルの最
大許容値との差分を算出し、この算出結果を別の
伝送回線あるいは上記送出信号レベル測定信号の
伝送が終了している場合には前記伝送回線１０を
介してフアクシミリ装置側へ返送する。これによ
りフアクシミリ装置側は、上記算出結果、つまり
先に述べた各信号レベルの差分に応じて半固定抵
抗減衰器９を操作し、送出信号レベルの調整を行
なう。例えば、交換機における送出信号測定信号
の着信レベルが−20dBmで、一方交換機におけ
る入力信号レベルの最大許容値が−15dBmであ
る場合、フアクシミリ装置側では上記各信号レベ
ルの差分、つまり5dBだけ、前記送出信号レベル
測定信号の送出信号レベルを増加させればよい。
かくして、送出信号レベルの調整がなされる。 Next, the operation of such a configuration will be explained according to the procedure for adjusting the output signal level. First, telephone 11
The switch (not shown) is called to connect the facsimile device and the exchange, and then the changeover switch SW1 is switched to the facsimile device side. Then, the changeover switches SW2 and SW3 are set to the side for adjusting the output signal level, and the aforementioned output signal level measurement signal is sent to the transmission line 10. On the other hand, on the exchange side, the incoming level of the above-mentioned outgoing signal level measurement signal transmitted via the transmission line 10 is measured by a level meter. Then, the difference between the incoming call level and the maximum allowable value of the input signal level in the exchange is calculated, and the calculation result is transferred to another transmission line or, if the transmission of the above-mentioned outgoing signal level measurement signal has been completed, to the transmission line. 10 to the facsimile machine. As a result, the facsimile apparatus operates the semi-fixed resistance attenuator 9 in accordance with the above calculation result, that is, the difference between the signal levels described above, and adjusts the level of the sending signal. For example, if the incoming level of the outgoing signal measurement signal at the exchange is -20 dBm, and the maximum permissible input signal level at the exchange is -15 dBm, the facsimile machine will accept the difference between the above signal levels, that is, 5 dB, from the outgoing signal. What is necessary is to increase the sending signal level of the signal level measurement signal.
In this way, the level of the transmitted signal is adjusted.
ところで、本実施例では先に述べたように送出
信号レベル測定信号の周波数を、伝送回線１０の
伝送損失が最小となる値（例えば1500Hz）に定め
て調整を行なつている。したがつて、調整後に画
信号伝送用の搬送波を如何なる周波数に定め伝送
しようとも、交換機における着信レベルは必ず入
力信号レベルの最大許容値以下となり、この許容
値を超えることはない。 By the way, in this embodiment, as described above, the frequency of the sending signal level measurement signal is set to a value (for example, 1500 Hz) that minimizes the transmission loss of the transmission line 10 and is adjusted. Therefore, no matter what frequency the carrier wave for transmitting the image signal is set to and transmitted after adjustment, the incoming call level at the exchange will always be below the maximum allowable value of the input signal level and will never exceed this allowable value.
このように、本実施例装置によれば、フアクシ
ミリ装置内に送出信号レベル測定用の特定周波数
の信号を発生させる機能を備え、送出信号レベル
調整時に切換スイツチSW２，SW３を切換える
だけで送出信号レベル測定信号を発生するように
しているので、フアクシミリ装置の据え付け時等
のように送出信号レベルの調整を行なう場合、調
整を行なう度毎に測定器を運搬する必要がなくな
り、送出信号レベルの調整を極めて迅速にしかも
手軽に行なうことができる。また、この場合送出
信号レベル測定信号の周波数を伝送回線１０の伝
送損失が最小となる値に定めているので、レベル
調整時に調整値の補正等が不要となり、またレベ
ル調整後に交換機の着信レベルが許容値を超える
といつた不具合が生じないから、調整を簡単かつ
確実に行なうことができる。さらに、本実施例で
は送出信号レベル測定信号を無信号部分（ブラン
キング部分）の無い連続波としているので、交換
機側において簡単なレベル計を使用して測定を行
なうことができる。また、送出信号レベル測定信
号発生手段として、搬送波発生用としてもとから
備えてある基準発振器１および分周器２をそのま
ま兼用し、分周器２の分周比を変えることにより
測定信号を得ているので、フアクシミリ装置の構
成を複雑化することがない。 As described above, according to the device of this embodiment, the facsimile device is equipped with a function to generate a signal of a specific frequency for measuring the level of the transmitted signal, and the level of the transmitted signal can be adjusted by simply switching the switch SW2 and SW3 when adjusting the level of the transmitted signal. Since the system generates a measurement signal, when adjusting the output signal level such as when installing a facsimile machine, there is no need to transport the measuring device each time the adjustment is made. It can be done extremely quickly and easily. In addition, in this case, the frequency of the outgoing signal level measurement signal is set to a value that minimizes the transmission loss of the transmission line 10, so there is no need to correct the adjustment value when adjusting the level, and the incoming call level of the exchange after level adjustment is Adjustments can be made easily and reliably since no problems will occur if the tolerance is exceeded. Furthermore, in this embodiment, since the sending signal level measurement signal is a continuous wave without a no-signal portion (blanking portion), measurement can be performed using a simple level meter on the exchange side. In addition, the reference oscillator 1 and frequency divider 2, which are already provided for carrier wave generation, are used as the sending signal level measurement signal generating means, and the measurement signal is obtained by changing the frequency division ratio of the frequency divider 2. Therefore, the configuration of the facsimile device does not become complicated.
なお、本実施例は上記実施例に限定されるもの
ではない。例えば、送出信号レベル測定信号を発
生する手段は、搬送波の発生回路と全く別個に設
けてもよく、また一部を兼用するものであつても
よい。さらに、送出信号レベル測定信号の周波数
は、伝送回線の伝送損失が最小となる値に限らず
如何なる周波数に設定してもよく、また搬送波周
波数の中で伝送回線の伝送損失が最も小さい値に
設定してもよい。また、使用する回線が限定され
る場合は、その回線で使用される減衰量測定用周
波数（たとえば加入電話回線の場合は技術基準に
より1500Hzでの減衰量により交換機における入力
信号の最大許容値が規定されている。）に合せる
ことが好ましい。また、送出信号レベル測定信号
は連続波以外に、例えばすべて黒画図のテストチ
ヤートを読み取つた画信号により変調したもので
あつてもよい。さらに、信号切換手段としては、
機械的な切換スイツチや半導体スイツチ等、どの
ようなものを用いてもよく、その他信号レベル調
整器等についても本発明の要旨を逸脱しない範囲
で種々変形して実施できる。 Note that this example is not limited to the above example. For example, the means for generating the sending signal level measurement signal may be provided completely separately from the carrier wave generation circuit, or may be partially used. Furthermore, the frequency of the sending signal level measurement signal may be set to any frequency, not just the value that minimizes the transmission loss of the transmission line, and may also be set to the value that minimizes the transmission loss of the transmission line among the carrier frequencies. You may. In addition, if the line to be used is limited, the attenuation measurement frequency used on that line (for example, in the case of subscriber telephone lines, technical standards specify the maximum allowable value of the input signal at the exchange based on the attenuation at 1500 Hz). ) is preferable. Further, the sending signal level measurement signal may be a signal other than a continuous wave, for example, one modulated by an image signal obtained by reading a test chart that is entirely black. Furthermore, as a signal switching means,
Any type of switch, such as a mechanical changeover switch or a semiconductor switch, may be used, and other signal level adjusters and the like may be modified in various ways without departing from the gist of the present invention.
以上詳述したように本発明によれば、フアクシ
ミリ送信機の送出信号レベルの調整を極めて簡単
かつ迅速に行ない得るフアクシミリ装置を提供す
ることができる。 As described in detail above, according to the present invention, it is possible to provide a facsimile apparatus that can extremely easily and quickly adjust the level of a transmission signal from a facsimile transmitter.
第１図は本発明の一実施例におけるフアクシミ
リ装置の概略構成図、第２図は同装置による送出
信号レベル測定信号の模式図である。
１……基準発振器、２……分周器、３……低域
通過フイルタ（LPF）、４……変調器、９……半
固定抵抗減衰器、１０……伝送回線、１１……電
話機、SW１〜SW３……切換スイツチ。
FIG. 1 is a schematic diagram of a facsimile apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a signal level measurement signal transmitted by the same apparatus. 1... Reference oscillator, 2... Frequency divider, 3... Low pass filter (LPF), 4... Modulator, 9... Semi-fixed resistance attenuator, 10... Transmission line, 11... Telephone, SW1 to SW3...changeover switch.
Claims (1)
し、この被変調波を信号レベル調整回路を介して
伝送回線に送出するフアクシミリ装置において、
前記搬送波と同一信号レベルの送出信号レベル測
定信号を発生する手段と、前記伝送回線への送出
信号レベルを調整する際に前記被変調波の代わり
に前記送出信号レベル測定信号を前記信号レベル
調整回路を介して伝送回線に送出する信号切換手
段とを具備したことを特徴とするフアクシミリ装
置。 ２ 送出信号レベル測定信号を発生する手段は、
伝送回線の伝送損失が最小となる周波数の送出信
号レベル測定信号を発生することを特徴とする特
許請求の範囲第１項記載のフアクシミリ装置。 ３ 送出信号レベル測定信号を発生する手段は、
無信号部分が無く常に信号レベルの一定な連続波
を送出信号レベル測定信号として発生することを
特徴とする特許請求の範囲第１項記載のフアクシ
ミリ装置。 ４ 送出信号レベル測定信号を発生する手段は、
搬送波を基準発振信号を分周することにより発生
している場合その分周比を可変することによつて
得ることを特徴とする特許請求の範囲第１項記載
のフアクシミリ装置。[Claims] 1. A facsimile device that modulates a carrier wave with an image signal obtained by scanning an original screen and sends this modulated wave to a transmission line via a signal level adjustment circuit,
means for generating a sending signal level measurement signal having the same signal level as the carrier wave; and the signal level adjustment circuit which generates the sending signal level measuring signal in place of the modulated wave when adjusting the sending signal level to the transmission line. A facsimile device comprising a signal switching means for sending a signal to a transmission line via the facsimile device. 2. The means for generating the sending signal level measurement signal is
2. The facsimile apparatus according to claim 1, wherein the facsimile apparatus generates a transmission signal level measurement signal at a frequency that minimizes transmission loss of the transmission line. 3. The means for generating the sending signal level measurement signal is:
2. The facsimile apparatus according to claim 1, wherein the facsimile apparatus generates a continuous wave having no no-signal portion and always having a constant signal level as the sending signal level measurement signal. 4. The means for generating the sending signal level measurement signal is:
2. The facsimile apparatus according to claim 1, wherein when the carrier wave is generated by dividing the frequency of the reference oscillation signal, the carrier wave is obtained by varying the frequency division ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8862380A JPS5713859A (en) | 1980-06-30 | 1980-06-30 | Facsimile equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8862380A JPS5713859A (en) | 1980-06-30 | 1980-06-30 | Facsimile equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5713859A JPS5713859A (en) | 1982-01-23 |
| JPS6133492B2 true JPS6133492B2 (en) | 1986-08-02 |
Family
ID=13947928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8862380A Granted JPS5713859A (en) | 1980-06-30 | 1980-06-30 | Facsimile equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5713859A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5999459A (en) * | 1982-11-29 | 1984-06-08 | Minolta Camera Co Ltd | Setter for copying magnification |
| JPS5934527A (en) * | 1982-08-23 | 1984-02-24 | Canon Inc | Copying machine |
| JPS6024530A (en) * | 1983-07-20 | 1985-02-07 | Canon Inc | Copying machine |
| JP2649035B2 (en) * | 1986-02-25 | 1997-09-03 | 松下電工 株式会社 | Emergency call device |
| JPS62161166A (en) * | 1986-12-05 | 1987-07-17 | Minolta Camera Co Ltd | Copy magnification setting device |
| JPH0743715Y2 (en) * | 1987-03-04 | 1995-10-09 | カシオ電子工業株式会社 | Magnification copying machine |
| JPH02306266A (en) * | 1989-11-28 | 1990-12-19 | Minolta Camera Co Ltd | Image forming device |
| JPH02306267A (en) * | 1989-11-28 | 1990-12-19 | Minolta Camera Co Ltd | Image forming device |
-
1980
- 1980-06-30 JP JP8862380A patent/JPS5713859A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5713859A (en) | 1982-01-23 |
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