JPS6051362A - Picture data transmission system - Google Patents

Abstract

PURPOSE:To eliminate a break of data to prevent the under run by stroing unit- track components of image data successively from a detachable recording medium into a picture storage means and transmitting data of unit tracks in the storage order. CONSTITUTION:When image data stored in a storage file 8 is read out and is transmitted, it is read in one-track units continuously, and data is subjected to S/P conversion in an S/P converting part 3 and is held in picute buffers 9 and 10. Image data is read out from the picture buffer 9 and passes an output register 4 and is subjected to P/S convertion in a P/S converting part 5 and is modulated and is transmitted. During this time, image data read out from the storage file 8 is held in a picture buffer 11. When image data held in the output register 4 is transmitted, image data held in the picture buffer 10 is transmitted immediately, and image data read out from the storage file is held in the picture buffer 9.

Description

Detailed Description of the Invention (11) Technical Field of the Invention The present invention relates to a transmission method for a facsimile communication device, and particularly to a transmission method that can prevent underruns of image data read from a data file and transmitted. about.

(tl) Background of the Technology In recent years, facsimile communication has been put into practical use for transmitting documents, figures, etc. to remote locations using communication lines. As shown in Figure 1, facsimile communication is a system in which transmitting and receiving devices between users are connected via a communication line and documents are communicated with each other. On the receiving side, the document is printed on thermal paper using a thermal printer, for example, to reproduce the document. There is also a method that uses public telephone lines for the line.

As one type of facsimile communication, an image transmission system is also used in which image data stored in a data file is read out and transmitted.

The invention applies in the case of such a system.

(C1 Prior Art and Problems Below, the conventional method will be explained with reference to the block diagram of FIG. 2.

Figure 2 is a professional diagram showing the outline of the image transmission system.
In the figure, 1 is a transmitter, 2 is a storage file, 3 is a serial/parallel converter (hereinafter referred to as S/P converter),
4 is an output register, 5 is a parallel/serial converter (hereinafter referred to as P/S converter), 6 is a modem, and 7 is a receiving device.

The storage file 2 is one in which image data is recorded.

The S/P converter 3 converts serial image data read from the storage file 2 into parallel image data.

The output register 4 holds image data to be transmitted and sends out the data according to the transmission speed of the line.

The P/S converter 5 converts the parallel image data sent from the output register 4 into serial image data.

The modem 6 has a function of modulating and sending out compressed transmission data.

Since it has such a configuration and function, the image data read from the storage file 2 of the transmitting device 1 is transferred to the S/P.
The data is converted into parallel image data by the converter 3 and held in the output register 4, then converted into serial image data by the P/S converter 5, modulated by the modem 6, and sent out to the line.

The receiving device 7 demodulates the received image data.

The data is expanded and printed out, for example, on printing paper.

In this way, the image data recorded in the storage file 2 is read out and transmitted, and printed as an image on printing paper or the like.

However, this method has the drawback that the configuration method of frame 6B (1γ) of image data is not adopted, and therefore there is always a possibility that an underrun of the sending data that falls at the break in the output register 4 will occur. .

That is, if a magnetic disk or floppy disk is used as the storage file 2, the output register 4
The condition that underrun does not occur due to emptying is that the ratio of the C read sector capacity (Hide: byte) to the data transfer rate to the line (bits/second: bps) is (
[Maximum rotation waiting time x sector read time] x maximum number of soft retries + step time x head stabilization time + software processing time).

In other words, if a normal file organization is used, for example, IB
If you apply semi-1 to M format, sector capacity = maximum I
Kbyte, maximum rotational waiting time child sector read time -166, 6m5ec, number of soft retries 11 times,
Step time 3 m5ec, hard stabilization time 15m
5ec, which does not satisfy the above conditions.

Therefore, there is always a possibility of underrun caused by soft errors.

(d1 Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a transmission system that can eliminate data shortages in the image buffer and prevent underruns.

(e) Structure of the Invention The present invention provides image data that is continuously stored track by track, and includes a removable recording medium and a plurality of removable recording media having a storage capacity corresponding to at least the storage capacity of a unit track of the storage medium. An image data transmission method that sequentially stores image data from a recording medium into the image storage means for at least a unit track, and transmits the image data from the middle track stored first, 1” target can be achieved.

(F1 Embodiment of the Invention Hereinafter, an embodiment of the present invention will be explained with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. 4 is a block diagram of the embodiment of the present invention. FIG.

In FIG. 3, reference numeral 8 indicates an accumulation file, reference numerals 9 to 11 indicate image buffers, and reference numeral 12 indicates a buffer control section.

The storage file 8 consists of floppy disks (hereinafter referred to as FDs), and as shown in Figure 4, they are serially stored one by one.
Image data is recorded in a file organization that allows continuous reading on a track-by-track basis.

The image buffers 9 to 11 are composed of RAM, and each has a storage capacity for one trunk of the storage file 8.

The buffer control unit 12 causes the image buffers 9 to 11 to sequentially hold the image data read out one trunk at a time from the storage file 8, and when the image data for 21-ranks is held,
It has a function to send out the previously stored image data.

With such a configuration and function, the accumulated file 8
When reading and transmitting the image data recorded on the S/S/
The image is P-converted and first stored in the image buffer 9. The image data read out next is held in the image buffer 10.

Once the image data is held in the two image buffers 9 and 10, data transmission starts, and the image data is sent out from the image buffer 9, is P/S converted and modulated through the output register 4, and is transmitted.

During this time, the image data successively read from the storage file 8 is held in the image buffer 11.

Immediately after all the image data held in the output register 4 is sent out, the image data held in the image buffer 10 is sent out, and the image buffer 9
The image data read out from the storage file 8 is held.

In this way, the image buffers 9 to 11 sequentially hold and send out image data, and this continues until the image data of the last track of one page is sent out.

In this way, even if the situation of waiting for the maximum access time due to a discrete error etc. occurs continuously, a margin can be ensured in any of the image buffers 9 to 11, and therefore, an uncoverable disk hard error will not occur. As far as possible, communication abnormalities caused by the accumulated file 8 can be prevented.

Since Fl) is used as the storage file 8, changes to the device can be made, management of the storage data is easy, and it is economical.

In the above example, a method has been described in which three image buffers 9 to 11 are provided to sequentially hold image data, but disk hard errors can be further covered by increasing the number of image buffers.

Further, the same effect can be obtained even if the image buffers 9 to 11 are provided with large capacity ones, and three or more areas for holding image data for one track are provided internally.

Further, image data to be read continuously from the storage file 8 is stored in image buffers 9 to 11 in units of multiple tracks.
A method may be adopted in which the storage capacity of the trunks is adjusted to correspond to the storage capacity of the trunks.

(g1 As described in detail of the invention, according to the present invention, since a removable storage medium is provided as a data storage file, data management is not only easy and economical, but also data can be transferred from the storage medium. Since underruns due to reading factors can be prevented, communication reliability can be improved and high quality received images can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing facsimile communication, FIG. 2 is a block diagram showing a conventional method, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. 4 is an explanatory diagram of FIG. In the figure, 1 is a transmitting device, 2 and 8 are storage files, and 3
4 is an S/P conversion unit, 4 is an output register, 5 is a P/S conversion unit, 6 is a modem, 7 is a receiving device, 89 to 11 are image buffers, and 12 is a buffer control unit. 0

Claims (1)

[Claims] An image transmission system that reads image data recorded on a recording medium and transmits it via a line includes a removable recording medium and at least one track of the storage medium, in which the image data is continuously stored in trunk units. a plurality of image storage means each having a storage capacity corresponding to the storage capacity; the image storage means sequentially stores image data from the recording medium in units of at least unit trunks, and image data of the previously stored unit track; An image data transmission method characterized by transmitting data from