JPS59127498A - Video data transmission system - Google Patents

Abstract

PURPOSE:To prevent a color shift easily by transmitting respective color components of video data, bit by bit, in series on time-division basis, and separating a receive signal in the respective components on a reception side and performing multicolor recording. CONSTITUTION:The readout part 21 in an information source 11 is supplied with a page synchronizing signal 13, scan synchronizing signal 14, and video synchronizing signal 17 to start reading an original. Then, the readout part 21 reads every picture element of the data on the basis of the signal 17 at a speed three times as fast as the signal. Its output is sent to a signal processing circuit 23 to perform binary-coding processing and tricolor separation. Consequently, the obtained video data 24R, 24B, and 24Y on three colors, i.e. red, blue, and yellow are inputted to three stages of shift registers 25 in parallel. Then, the registers 25 receive those signals and output them in series. On the other hand, a reception-side multicolor recording device 12 receives the serial signal by a shift register 26 and separates the signal into parallel signals to perform the tricolor recording in the method opposite to the transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a digital data transmission system used in a multicolor recording apparatus.

(Prior art) A device that records video data (picture information) in two or more colors (a multicolor recording device exists).A multicolor recording device records video data from an information source such as a reading device. There have traditionally been two methods for receiving the supply. One is a method for transmitting video data using separate signal lines or transmission lines (hereinafter referred to as signal lines) for each recording color. .

Another method uses one signal line and transmits video data sequentially for each distributed color in the middle of the page.

However, the former method requires as many signal lines as the number of recorded colors, making it difficult to increase the number of recorded colors.

Also, in the latter method, - is it suitable for an overlapping development type or overlapping recording type recording device that performs overlapping recording for each color?
This is not suitable for a device that records each color in parallel. ? ! However, such multi-color recording devices are equipped with large-capacity memory, and after storing video data for each color once,
It was necessary to record.

In addition, according to the latter method, the information source that sends out the image information also requires a large amount of memory, and the information source that sends out the image information requires a large amount of memory, and the color components and the same data are read on a per-page basis.
This method has the disadvantage that it requires a large circuit structure, making the device expensive and complicated.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention provides a video data transmission system that can transmit video data for a plurality of recorded colors simultaneously over a single signal line. Its purpose is to

(Means for Achieving the Object) In the present invention, the digital data divided into a plurality of color components is transmitted bit by bit in a time-division manner, thereby achieving the above-mentioned object.

The present invention will be described in detail below with reference to Examples.

(Embodiment) FIG. 1 schematically shows a communication system employing the video A data transmission method of the present invention.

B-scale signals are transmitted between the information source 11 and the multicolor recording device 12. Among these, the page synchronization signal 13 (FIG. 2a) is a signal for synchronizing each page at the falling edge of this signal. In addition, the scanning line synchronization signal 14 (Fig. 2L)) starts from the first rise time 11 after the page synchronization signal 13 falls,
A recording scan 16-1 for the first scanning line on one sheet of recording paper 15 shown in FIG. 3 is started. Similarly, from the next rising time t2 of the scanning line synchronization signal 14, the second
The recording scan 16-2' for the scanning line 16-2' is started.

The same applies below.

The other 3 data transmitted between the information source 11 and the multicolor recording device @120
The types of signals are a video synchronization signal 17, a video data signal 18, and one device control signal. FIG. 4 shows the relationship between the video synchronization signal 17 (b in the figure) and the video data signal 18 (c in the figure) when performing three-color recording, and the relationship between the scanning line synchronization signal 1
4 (shown together with a) in the same figure.Video synchronization signal 17 (represented at a predetermined frequency).When the scanning line synchronization signal 14 also rises, the first video synchronization signal Transmission of the video data signal 18 starts from the rising edge of the video data signal 18.First, in one cycle from the first rising edge of the video synchronizing signal 17 to the next rising edge, one hit of video data for the first recording color C1 is transmitted. Then, in the next cycle 1, 1 bit of video data for the second recording color C2 is transmitted, and then in the next cycle, the video data for the third recording color C2 is transmitted.
Video data for 3 is transmitted to 1 pit 1. Similarly, the video data for the first to third recording colors 01 to C3 are transmitted bit by bit in a similar manner. The device control signal 19 is used to notify the status of each device, including the information source 11 and the multicolor recording device 12, and to instruct the start and forced termination of various operations.

The specific operation of a'3 in this communication system will be explained below.

The information source 11 uses the device control signal 19 to determine whether the multicolor recording device 12 is in a communicable state. If communication is possible, a device control 178 is sent to the multicolor recording device 12.
No. 19 is used to notify the start of the transmission operation of B]°A data. The multicolor recording device 12 sends a page l1i1 period signal 13 to the information fii 11 in order to receive the video data, and also sends back a video synchronization signal 17 to the information fii 11.

FIG. 5 is for explaining the process from creation to recording of video data. Information II! A reading section 21 in the reading section 11 receives the page synchronization signal 13, the scanning line synchronization signal 14, and the video synchronization signal 17, and starts reading the document.

At this time, the reading section 21 uses the video synchronization signal 17 to
Data is read for one pixel at a cycle three times as long as this.

The read data 22 is supplied to a signal processing circuit 23, where binarization processing and three-color separation are performed. The three-color video data 24 of red, blue, and yellow obtained as a result of three-color separation is
1, 24B and 24Y are the three-stage shift register 2.
5 parallel human power. In synchronization with the video synchronization signal 17, the shift register 25 serially outputs the data A5--24R124B and 24Y to the 3rd hit1.

These are transmitted to the multicolor recording device 12 side as video data signals 18 of the first to third recording colors C1 to C3, respectively. Since the video data IH18 is a time-divided serial signal, one signal line kJ for transmitting this signal is sufficient.

Video data 24R124B and 24Y are sequentially set in the shift register 25 in cycles 3-8 of the video synchronization signal 17, and the transmission of the video data signal 18 is repeated in the same manner.

On the other hand, in the multicolor recording device 12, the video A data signal 18 is inputted in series to three stages of shift registers 25 at each rising edge of the video synchronizing signal 17.

Then, these are converted into parallel signals, and the video synchronization signal 17
The recording head drive circuit 28 outputs video data 27R, 27B and 27Y of three colors red, blue and yellow at a cycle three times as long as .
A drive signal 29 is created based on
supply cover. The recording section 31 starts recording scanning with the first scanning line synchronization signal 14 after the fall of the page synchronization signal 13, and performs three-color recording using the drive signal 29.

Although three-color recording has been described in the embodiments described above, the present invention can also be applied to two-color recording and four or more color recording. Furthermore, although the embodiment has been described with reference to the case where video data is obtained from the reading unit, it is also possible to similarly obtain video data from a color graphics viewer or other multicolor information source.

(Effects of the Invention) According to the present invention, video data is transmitted bit by bit in a time-division manner while corresponding to each pixel, so that when each recorded color is transmitted sequentially in page units, In comparison, color shift can be easily prevented and a recording section with stable quality can be obtained.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention.
Figure 2 is a schematic diagram of the communication system; Figure 2 is a timing diagram of the page synchronization signal and scanning line synchronization signal; Figure 3 is an explanatory diagram showing how the recording paper is scanned; - Figure 4 is the scanning line synchronization diagram. 1 is a timing diagram showing the relationship among the bright signal, the video synchronization signal, and the video data signal 18. FIG. 5 is a block diagram showing the circuit portion in which video data is processed. 11...Information #12...Multicolor recording device 18...Video data signals C1 to C3...First to third recording color ratios Representative of Fuji Xerox Co., Ltd.
Patent Attorney Umeo Yamauchi Figure 1 Figure 2 Figure 4 Figure 1 Figure 5 Anti-1

Claims (1)

[Claims] Video data divided into multiple color components is transmitted serially in a time-division manner, one pixel for each color component, and the recording side that receives this video data separates this data into multiple color components and transmits the data one by one. A video data transmission system characterized by the ability to record in color.