JPS58111472A - Picture data transmission system - Google Patents

Abstract

PURPOSE:To attain simultaneous transmission instantly, by interrupting a picture signal and other data signals with each other in a prescribed period in a system transmitting other signals together with the picture signal. CONSTITUTION:An image of an original is formed into a binary picture signal on an image pickup element, and after the application of a horizontal synchronizing signal 3, a data selector 5 is controlled by a count output signal for the period counting ten-and-several bits' share to select an input B. Thus, in the period, a control signal from a sequence controller 7 is applied to the data selector 5 and inserted to the data signal of a composite picture signal. When the period of the data signal is elapsed succeedingly, the data selector 5 selects an input A to start the transmission of the picture signal from an original reader 1. Thus, only two communication lines are used and the picture signal and the other data signals are transmitted instantly without error at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION This field image data transmission system transmits control signals and other data signals, particularly without confusing image signals and data signals, and without delaying the transmission of data signals. With a simple configuration, it is possible to distinguish between the two and transmit them with high quality.

Conventionally, when transmitting an image signal recorded in a recording unit such as a facsimile machine, control signals for the transmission and other data signals such as various messages, for example, a transmission start gI number of the image signal, a transmission interruption signal, When transmitting a transmission completion signal, various error signals, transmission source identification signal, image number signal, etc. through the same transmission path as the image signal, they must be transmitted before or after the transmission of the % adjustment signal. was.

Therefore, for example, even if you want to cancel the transmission because a transmission error has occurred, the reception fsK will not be able to detect the error that occurred in the transmission 11 until after the transmission of the 1-maki field image is completed. This had the disadvantage of causing some inconvenience.

Furthermore, in the past, when image signals and other data signals were switched and transmitted through the same transmission path using a switching circuit, there was a drawback that the two could be mixed up and received incorrectly.

It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to convert image signals and other data signals into 15? Data signals such as control signals that interrupt each other at regular intervals and immediately respond to unforeseen situations such as requests to stop transmission that occur during the transmission of image signals are transmitted at any time. It is an object of the present invention to provide a data transmission system for both images, which can transmit images without confusing the two images.

The invention will now be described in detail by way of example with reference to one drawing.

First, an example of a mode of transmitting a composite image signal in which a data signal is inserted into an image signal to be recorded at a predetermined period is shown in sequence in FIGS.

FIG. 1(a) shows a composite image signal according to the present invention, where l horizontal scanning portion l of the composite image signal is
If N, it is assumed that 1 14 times are repeated to form one vertical image. Of the seven l horizontal running gogo/H, n
is horizontal synchronization g! X is the factor (the other data signal part mentioned above, such as the control signal for Lie image transmission),
Further, J/ is the facsimile image signal S. That is, in the example shown in Figure 1, the data signal portion X is the horizontal synchronization signal portion l! and the image signal S/I to form a composite image signal. Note that this composite image signal is, for example, transmitted through a single transmission line by a pulse width
Figure (b) is a temporally enlarged view of the horizontal synchronization signal, and the horizontal synchronization signal is a pulse train of '0'' and '''l'' as indicated by the - mark in the figure. Pulse 1 at
1" by missing one pict. Except for this missing part of the horizontal synchronizing signal, the time interval between the rising points of the waveform in the pulse train shown in Figure 1 is constant, and the pulse train is driven by the rising edge of the pulse train. By inverting the pulse train, a square wave signal train synchronized with the pulse train in Figure (b) is obtained, as shown in Figure (e), and the phase-locked circuit PLL is driven by this square wave signal train. Multiply it twice.

A long signal is obtained as shown in FIG.
' If the signal is processed, the baseband image signal can be demodulated, as shown in () in the same figure.

In addition, in the pulse width modulation signal shown in the same figure (b), the part where the pulse width of level @/1 is narrow in the pulse train of &@O'', l'' represents 00'' of the image signal and data signal, and the level It is assumed that the portion where the pulse width of 1'' is wide represents 11'' of the image signal and data signal.

Next, a second configuration example of an image data transmission system configured to transmit a composite image signal according to the present invention as described above will be described.
In the illustrated configuration shown in the figure, l is a document reading device that images the image of an original IC (not shown) on an image sensor (not shown) to form a co-value-image signal. In addition, J is a horizontal synchronization circuit, J is a horizontal synchronization signal, and J is a counter.
When the horizontal synchronizing signal J is applied, the data selector is activated by the number of stitches output 41 only during the period of counting ten or more picts, that is, during the period of the data signal shown in Figure 1. to select the input on one side. So, that data signal 1
During the 0 period, the control signal from the sequence controller 7 changes from parallel to serial! 1 circuit 1 to the data selector I, and the composite image signal is inserted into the data signal 19 portion.

Subsequently, when the data signal 190 period has elapsed, the data selector j it inputs A pieces to the screen and starts transmitting the image signal from the document reading device l.

In addition, 9 is 1, for example, a hair return@@view MODIM for transmitting a composite image (li number) via a telephone line, 10 is the telephone Ig1m%l is a clock generation circuit for generating the above-mentioned clock signal, /l is the receiving side modulation/demodulation circuit MOD
13 is a sequence controller on the receiving side, and 13 is a horizontal synchronization signal from the composite image signal. /j is a printer that turns on and off a semiconductor laser (not shown) based on the %-image signal;
The output laser beam is main-scanned by a 1 gJ multi-faceted comb (not shown), and a photosensitive drum (not shown) coated with a photoconductive material is used.
An electrostatic latent image is formed on top of #1 by toner of opposite polarity. The image is then transferred onto paper and fixed to form an output image. Furthermore, l≦ is the receiving side transmission path, and each of the above-mentioned components j, 4', ! , 4. ! and t, respectively.

Also, /7 is the return telephone line, /l is the receiving line,
It is composed of circuit elements corresponding to the above-mentioned components //, /J, and /dream, respectively.

Note that data signals such as control signals may be transmitted in one direction as described above, or may be transmitted in two directions in a so-called handshake mode. That is, the sequence controller 97 on the transmitting side and receiving side in the above configuration.
and 13 respectively! In addition, 1, for example, 2 pins of the data signal in the composite image signal shown in Figure 1 are assigned for controlling handshake mode transmission, and these cobits are assigned to the transmitting side as shown in Figure 3. and R-RIQ and '1 for the receiver side, respectively.
'-118Y/ACK, and 'I'-RIQ and R-B8Y/Act.

now,! If a data signal is to be transmitted from a to a,
As shown in the diagram @J, at T, a-BjiY /
After confirming that ACK is at a low level and ensuring the integrity of the data signal to be transmitted, "-ILIQ
If %a is a high level, then a high level of IQ
At the same time, it detects and converts B8Y/Act to high level, reads the transmitted data signal, returns R-B8Y/ACK to low level again after reading it, and starts receiving the next data signal. stand by. Note that at %T, the signal R-B8Y/ACK from the side was converted to a high level.

R-RIQ can be set to high level immediately, and furthermore, when R-RIQ is received by an engine-trigger type launch circuit, it can be converted to low level at any time. Also,! In, R-B8Y/AC
Continue sending out data until you see K returned to a low level, and after you see iL-BgY/ACK returned to a low level.

Only then can the next data signal be transmitted.

Note that data transmission from R to T is also controlled in exactly the same manner as described above.

, As is clear from the above, according to the present invention, it is possible to instantly transmit a facsimile image signal and other σ data signals simultaneously using only one, for example, two communication lines, and it is possible to instantly transmit a facsimile image signal and other σ data signals using only one, for example, two communication lines. Compared to [2], there is no risk of malfunctions such as mixing both signals, and [
Interruption 4 of data transmission during image transmission becomes possible. Furthermore, it is possible to perform ff6 sequence control on the receiving side in real time by directly connecting the sequence controller on the transmitting side. Note that the cost required to carry out the present invention is extremely low compared to the cost for separately providing a conventional device, and the present invention has a great advantage in this respect as well.

[Brief explanation of drawings]

1 (&) to (・) are diagrams sequentially showing configuration examples of an image data composite signal according to the present invention, FIG. 2 is a block diagram showing a configuration example of a data transmission device of the present invention, and 3 The figure is a diagram illustrating an example of a data transmission aspect according to the invention. I...Original reading device, -...Horizontal synchronization time*. J-...Horizontal synchronization signal, Da...Counter,!・
...Data selector, ≦...Parallel/serial conversion circuit. 7.13...-Sequence controller. t...Clock generation circuit, ? , //...modulation/demodulation circuit (MODIM). 10, /7...Telephone line, 12...Serial/parallel conversion circuit, IP...Synchronization separation circuit, 15...Printer, /4-...
- Transmission circuit, /I...reception circuit. 19...Horizontal synchronization signal part % X...-data signal part, 1...image signal part. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] In an image data transmission system that performs a recording operation by transmitting an image signal interposed with a horizontal synchronization signal for controlling the horizontal scanning of a spear to a recording unit, the transmission of the horizontal synchronization signal is slow and the palpitation signal is transmitted. 2. An image data transmission system characterized in that another data signal is transmitted during at least four of the period from the time the image signal is transmitted until the horizontal synchronization signal is transmitted.