JPH0716231B2 - Encoding / decoding device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoding / decoding device such as a facsimile device.

2. Description of the Related Art Conventionally, in a coding / decoding device of a facsimile apparatus, when transmitting a document, image data of a transmission document input from the scanner unit is sequentially encoded line by line and output to the transmission / reception unit, and the scanner unit ends the page. Is notified, a control return code (RTC code) is sent following the code data of the last encoded line to perform a page break. On the other hand, in the case of document reception, the code data of the received document input from the transmission / reception unit is decoded line by line from the first line of each page and output to the printer unit. To do.

Problems to be Solved by the Invention However, in such a configuration, there is a problem that the sizes of the output recording papers are not uniform when a document in which pages of different sizes are mixed is received. For example, when receiving an A4 size document, if there are A5 size pages in the received document,
Only the output recording paper of A5 size page is cut to A5 size length, and the output recording paper of other pages is cut to A4 size length. In this way, if the size of the output recording paper is uneven,
Not only is it inconvenient to handle, but small size pages are easily lost.

The reason why such a problem occurs is that when the end of a page is detected by the scanner unit on the transmission side, the RTC code is sent to perform a page break without considering the number of lines in the page, and the reception side This is because when the RTC code is detected, the page break is performed without considering the number of lines in the page, and the recording paper (roll paper) is cut by the printer unit.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an encoding / decoding device to which a fixed processing function for making the number of lines of each page constant is added.

Means for Solving the Problems In order to solve the above problems, the present invention encodes or decodes externally input data by an encoding / decoding circuit, and outputs the encoded data or the decoded data to the outside. In the encoding / decoding device, counting means for counting the number of lines of the data of each page input to the encoding / decoding circuit, and the counting device at the time when the data of the last line of the page is input to the encoding / decoding circuit. The dummy all-white line data for compensating for the deficiency from the set value of the count value of the counting means is externally output as the decoded data of the page, or the encoding / decoding circuit as the input data of the page. And means for inputting into the.

Effect According to the present invention, when the number of lines of a page to be decoded or coded is less than the specified value, the dummy white lines for the number of missing lines are inserted into the page, and the number of lines of all pages is according to the above configuration. Is adjusted to the specified value. Since such a routine process relating to the number of lines is performed, by using the encoding / decoding device of the present invention in a facsimile device, for example, it is possible to arrange the output recording papers to have a constant length. The problem disappears.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an encoding / decoding device according to an embodiment of the present invention. This encoding / decoding device is for performing encoding of image data of a transmission original or decoding of encoded data of a reception original in a facsimile device.

1 is MR method (CCITT recommendation T.4) and MMR method (CCITT recommendation T.4).
According to 6), an encoding / decoding circuit for encoding image data or decoding the encoded data, 2 is an image data buffer for temporarily storing image data of a transmission / reception document, 3
Is a code data buffer for temporarily storing code data of a transmission / reception document. The image data buffer 2 has a toggle structure in which two line buffers LBA and LBB are alternately used for data buffering of a coding line or a decoding line or data buffering of a reference line.

In the case of document transmission, that is, in the case of encoding operation, the image data of the document to be transmitted is input from the scanner section to the encoding / decoding circuit 1 via the image data buffer 2, and the encoded data is transmitted via the code data buffer 3. And outputs it to the transmitter / receiver. In the case of document reception, that is, in the case of decoding operation, the code data of the document received from the transmitter / receiver is code data buffer 3
Is input to the encoding / decoding circuit 1 via, and the decoded data is output to the printer unit via the image data buffer.

Reference numeral 4 is a three-state buffer for controlling the input of image data from the scanner unit, and reference numeral 5 is a three-state buffer for controlling the output of image data to the printing unit.

Reference numeral 6 denotes an encoding / decoding control circuit, which is an encoding / decoding circuit 1
The control related to the encoding / decoding operation such as the operation control and the data input / output control is performed. This encoding / decoding control circuit 6
Includes a fixed value processing control unit 10 for controlling the fixed value processing in cooperation with the set value register 7, the line number counter 8, and the comparison circuit 9.

In the set value register 7, the number of specified page lines designated by the user of the facsimile is set. The line number counter 8 is for counting the number of lines of the data of each page which is input to the encoding / decoding circuit 1 and is encoded or decoded, and is controlled by the routine process control unit 10. The comparison circuit 9 uses the count value of the line number counter 8 and the set value register 7
It is a circuit for comparing the set value of the above, and its comparison output is input to the routine process control unit 10.

Reference numeral 11 denotes an interface circuit between the encoding / decoding control circuit 6 and the main control unit, scanner unit, and printer unit in the facsimile apparatus.

The operation of the encoding / decoding device configured as described above will be described below.

First, the case of document reception (decryption) will be described. The code data of the received document is sequentially transferred from the transmitting / receiving unit to the code data buffer 3. This coded data is sequentially input to the coding / decoding circuit 1 under the control of the coding / decoding control circuit 6,
Decrypted. The decoded data (image data) is sequentially stored in one line buffer (for example, LBB) selected for the decoding line in the image data buffer 2. When the decoded data of one line is accumulated, the encoding / decoding control circuit 6 notifies the printer section through the interface circuit 11. If transfer is possible, the encoding / decoding control circuit 1
Under the control of 1, the decoded data in the line buffer (LBB) is output to the printer section via the three-state buffer 5, and is recorded on the roll recording paper in the printer section.

When the output of the decoded data is completed, the encoding / decoding control circuit 6 switches the line buffer (LBB) in the image data buffer 2 for the reference line and the other line buffer (LBA) is the decoding line. Can be switched for. Note that the content of the line buffer (LBA or LBB) for reference lines is referred to by the encoding / decoding circuit 1 when decoding a decoding line, but when decoding the first line of each page, the image data buffer 2 At least the line buffer (LBA or LBB) for the reference line is reset, and the stored data is set to the data of all white lines.

The line number counter 8 is reset by the routine process control unit 10 of the encoding / decoding control circuit 6 immediately before the start of decoding of each page, and then the line end code (EOL code) is input from the code data buffer 3. Incremented every time. Therefore, the number of lines from the first line of each page which is input to the encoding / decoding circuit 1 and decoded is obtained as a count value in the line number counter 8.

If the RTC code is input from the code data buffer 3 before the coincidence signal is output from the comparison circuit 9, the encoding / decoding control circuit 6 inhibits the operation of the encoding / decoding circuit 1 and the image data buffer 2 is reset. Then, the content is set as the all-white data. Next, under the control of the routine process control unit 10, the data of the all white line is output from the image data buffer 2 to the printer unit. The routine processing control unit 10 increments the line number counter 8 every time the all-white line data is output for one line, and checks the comparison output of the comparison circuit 9. If the comparison output indicates a mismatch, the entire white line data is output for one line. In this way, the all-white line data is output (the dummy all-white line is inserted in the latter half of the page) until the comparison output of the comparison circuit 9 indicates a match. When the comparison output of the comparison circuit 9 indicates a match, the routine processing control unit 10 ends the output of all white line data. The encoding / decoding control circuit 6 causes the interface circuit
The page break is notified to the printer unit via 11, and the recording paper is cut by the printer unit.

FIG. 2 is an explanatory diagram of such a page with an insufficient number of lines. 13 is the part of the line actually received in the page, and 14 is the part of the inserted dummy all white line.
The number of lines in this portion 14 is equal to the difference between the set value PLG and the number of lines in the portion 13. In this way, the number of lines is
For the pages that are short of, the total number of lines is adjusted to a specified value by inserting dummy all-white lines, so that the output recording paper has a fixed length.

Up to this point, the routine processing of the page having the insufficient number of lines has been described, but the routine processing of the page having the number of lines exceeding the specified value will be described next.

In the case of receiving such a page, the match signal is output from the comparison circuit 9 before the RTC code is input from the code data buffer 3. When the routine processing control unit 10 recognizes this coincidence signal, the encoding / decoding control circuit 6 interrupts the main control unit of the facsimile apparatus. On the other hand, when the processing suspension instruction is given, the encoding / decoding control circuit 6 suspends the decoding operation.

On the other hand, when the processing continuation instruction is given from the main control unit, the encoding / decoding control circuit 6 inhibits the operation of the encoding / decoding circuit 1, notifies the printer unit of a page break, and notifies the image data buffer 2 of the image data buffer 2. The line buffer (for example, LBA) in which the data of the current decoding line is accumulated is set for the reference line, the other line buffer (LBB) is reset, and the line number counter 8 is also reset. Then, the encoding / decoding circuit 1 is operated, and the remaining data of the page is decoded as the data of the new page. For this page, if the number of lines is insufficient, the standard process is performed by inserting dummy all-white lines as in a normal page.

Next, the case of document transmission (encoding) will be described. The image data of the transmission original transferred from the scanner unit is input to the image data buffer 2 via the three-state buffer 4 under the control of the encoding / decoding control circuit 6, and one line selected for the encoding line is selected. Buffer (eg LB
Accumulated in B). The start / end of each line and the end of page are notified from the scanner unit to the encoding / decoding control circuit 6 via the interface circuit, and before the transfer of the image data of each page is started, each line buffer of the image data buffer 2 is LBA and LBB are set by the encoding / decoding control circuit 6.

Under the control of the encoding / decoding control circuit 6, the image data in the encoding line line buffer (LBB) and the image data in the reference line line buffer (LBA) (margin line data in the first line of the page) are encoded / decoded. The image data input to the circuit 1 is sequentially encoded, and the encoded data (coded data) is output to the transmission / reception unit via the coded data buffer 3 and transmitted. The EOL code is inserted at the beginning of the top line of each page and the end of each line.

The line number counter 8 is reset by the routine process control unit 10 immediately before the start of encoding of each page, and is incremented every time one line of image data is input to the encoding / decoding circuit 1 and encoded. Therefore, the line counter 8 obtains the number of lines from the first line of each page input to the encoding / decoding circuit 1 and encoded.

When the end of page is notified from the scanner unit before the coincidence signal is output from the comparison circuit 9, the encoding / decoding control circuit 6 prohibits the transfer of the next page data from the scanner unit, and then the encoding line. Only one of the line buffers (for example, LBA) that is used is reset and the same encoding operation is performed. That is, the dummy all-white line data is sequentially input to the encoding / decoding circuit 1 as encoding line data to be encoded.

The routine processing control unit 10 increments the line number counter 8 each time the all-white data for one line is input, and checks the comparison output of the comparison circuit 9. When the routine processing control unit 10 recognizes that this comparison output is a coincidence signal, the encoding / decoding control circuit 6 notifies the encoding / decoding circuit 1 of a page break, and the RTC code (EOL code) is added after the code data. Column) is output.

In this way, even in the case of transmission, data of dummy all white lines corresponding to the number of insufficient lines is input to the encoding / decoding circuit 1 and encoded for a page whose number of lines does not meet the specified value. . Therefore, in the receiving side facsimile apparatus, even if the encoding / decoding apparatus does not have a standard processing function, the length of the output recording paper of each page becomes constant, and the problem of uneven recording paper size as in the past does not occur. .

On the other hand, when the number of lines on the page exceeds the specified value, the following operation is performed. In the case of such page transmission, the comparison circuit outputs a coincidence signal before the page end notification. When this coincidence signal is generated, the encoding / decoding control circuit 6 interrupts the main control unit of the facsimile apparatus. On the other hand, when the processing suspension instruction is given, the encoding / decoding control circuit 6 suspends the encoding operation.

On the other hand, when the processing continuation instruction is given from the main control unit, the encoding / decoding control circuit 6 notifies the encoding / decoding circuit 1 of a page break and causes the RTC code to be output. Then, the remaining data of the page is encoded as the data of the new page. For this page, if the number of lines is insufficient, the standard process is performed by inserting dummy all-white lines as in a normal page.

The example of the encoding / decoding apparatus used in the facsimile apparatus has been described above, but the present invention can be applied to the same encoding / decoding apparatus used for other purposes. Further, the present invention is similarly applicable to a device that performs only one of encoding and decoding.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, when the number of lines of a page is smaller than the specified value, the total number of lines of each page is reduced by inserting dummy white lines for the shortage. Since the fixed-size processing is performed, it is possible to prevent the uneven size of the output recording paper, which is a problem in the facsimile machine.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an encoding / decoding device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a stylization process. 1 ... Encoding / decoding circuit, 2 ... Image data buffer,
3 ... Code data buffer, 6 ... Encoding / decoding control circuit, 7 ... Setting value register, 8 ... Line number counter,
9 ... Comparison circuit, 10 ... Regular processing controller.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Shimoosawa 2-3-8 Shimomeguro, Meguro-ku, Tokyo Matsushita Densen Co., Ltd. (72) Toru Kitamoto 2-3-8 Shimomeguro, Meguro-ku, Tokyo No. Matsushita Dentsu Co., Ltd. (72) Inventor Akira Shichijo 2-3-8 Shimomeguro, Meguro-ku, Tokyo Matsushita Dentsu Co., Ltd. (72) Hideyuki Shirai 2-3-8 Shimomeguro, Meguro-ku, Tokyo Matsushita Matsushita Dentsu Co., Ltd. (56) Reference JP-A-1-105664 (JP, A) JP-A-63-127668 (JP, A) JP-A-62-42868 (JP, A)

Claims (1)

[Claims] 1. A coding / decoding device for coding or decoding data inputted from the outside by a coding / decoding circuit and outputting the coded data or the decoded data to the outside, wherein: Counting means for counting the number of lines of the data of each input page, and compensating for the deficiency from the set value of the count value of the counting means at the time when the data of the last line of each page is input to the encoding / decoding circuit. A dummy all white line data for outputting to the outside as the decoded data of the page or inputting to the encoding / decoding circuit as the input data of the page. Decoding device.