JPH05244430A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by adding and sending a fill bit based on a count resulting from counting a coded scanning line when a data quantity of code data is counted and the count reaches a specified count. CONSTITUTION:When a control section 4 detects a clock sent attended with generation of generated code data, a generated code counter 9 counts up the clock to count a bit number of the generated code data. Then the fully white level line signal is detected, a full white level scanning counter 10 is counted up to count the fully white lines. Furthermore, when the control section 4 detects a one-line coded end signal, a coded scanning line counter 8 is counted up and the number of coded lines is counted. The number F of bits of a block fill for the block is given by a specific equation. When the number of bits F of the fill is negative, since the block satisfies the minimum transmission time, the counters 8, 9, 10 are reset and the code to a succeeding block is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus for transmitting and receiving a document image information as a one-dimensional or two-dimensional encoded and compressed signal.

[0002]

2. Description of the Related Art CCiT, which is a facsimile communication standard
In the T GIII type facsimile apparatus, the document information signal is compressed and encoded with high efficiency by one-dimensional encoding or two-dimensional encoding and transmitted.

For example, if all of the line drawing information signals for one line (1728 bits for A size) are white information, this facsimile machine uses one-dimensional code or two-dimensional code data corresponding to white 1728. A fill bit used to satisfy the minimum transmission time determined by the pre-message control means and a line synchronization code EOL indicating the end of the line.
Are transmitted in the order of line synchronization code EOL, one-dimensional code or two-dimensional code data, and fill bit.

In addition, in the white line skip method conventionally used to improve the code transmission efficiency, when a white line is detected on the transmission side, a special LS (line skip) signal is transmitted and the reception side. The LS signal is detected and the line is skipped.

[0005]

However, in the facsimile apparatus which adopts the conventional line skip method, since the fact that there is an all white line is transmitted from the transmission side to the reception side by a special LS signal, this LS signal is transmitted. Since it is necessary to provide a circuit for generating and detecting the above, there is a cost disadvantage.

This problem occurs because all white lines are skipped and transmission efficiency is improved. Therefore,
A method of improving the transmission efficiency by shortening the minimum transmission time for one line is also conceivable, but in this case, the recording speed on the receiving side must be made high, and the decoder and recording unit on the receiving side must be made high. There will be a new problem that the cost will increase.

The present invention solves the above-mentioned conventional problems, and performs line skip control without using a special LS signal and without requiring a circuit for generating and detecting the LS signal in the previous period. In addition, it is an object of the present invention to provide a facsimile apparatus capable of improving transmission efficiency by reducing fill bits.

[0008]

A first counting means for counting the data amount of coded data coded by the coding means, and a second counting means for counting the number of scanning lines coded by the coding means. And a control means for performing transmission by adding a fill bit calculated based on the count value of the second counting means to the encoded data when the count value of the first counting means reaches a specified value. The feature is that it is provided.

[0009]

With the above configuration, one block of code data is generated each time the code data reaches a specified value, and fill bits can be added in units of this block to transmit from the transmitting side to the receiving side.

[0010]

1 is a block diagram of a transmitting side showing an embodiment of a facsimile apparatus according to the present invention, and FIG. 2 is a block diagram of a receiving side in the same embodiment. The transmitting side shown in FIG.
A reading unit 1 having an image sensor such as a CD, a line memory control unit for temporarily accumulating a document image information signal read by the reading unit 1, and a line memory control unit 2
, A coder 3 for reading the stored picture information signal and performing one-dimensional or two-dimensional coding to generate code data, and a control unit 4 for controlling the entire facsimile.
A fill bit output from the control unit 4 and an S / P (serial / parallel) conversion unit 5 that converts the code data into a parallel signal, and a code data buffer memory that temporarily stores the output of the S / P conversion unit 5. 6 and a modulator / demodulator 7 for converting the output of the code data buffer memory 6 into a transmission signal and transmitting the signal to the line.
A coded scan line counter 8 and a generated code counter 9
And an all-white scanning line counter 10 are provided.

The coded scanning line counter 8 counts up every time code data is generated by the encoder 3. The count result is the number of scan lines (line) of the code data generated by the encoder 3. (Number) Lt. The generated code counter 9 counts the number of bits of the code data generated by the encoder 3, and the counting result indicates the code data (including line synchronization code) generated by the encoder 3. It represents the total number of bits B. The all-white scanning line counter 10 counts up each time the encoder 3 generates code data indicating an all-white line, and the count result is the all-white scanning line generated by the encoder 3. The number (total number of white lines) L _w is represented.

The receiving side shown in FIG. 2 is a modulation / demodulation section 17 for demodulating a transmission signal from the transmission side.
Data buffer memory 16 for temporarily storing the output of
A P / S (parallel / serial) converter 15 for converting the output of the code data buffer memory 16 into a serial signal; a decoder 13 for decoding the output of the P / S converter 15; A line memory control unit 12 for temporarily accumulating the code data output by the recording medium, a recording unit 11 for recording the output of the line memory control unit 12 on paper, and a control unit 14 for controlling the entire facsimile. The receiving side and the transmitting side operate as described below.

First, the general flow of the document image information signal on the transmitting side will be described. The document image information signal output from the reading unit 1 is stored in the line memory control unit 2. The encoder 3 reads the document image information signal from the line memory controller 2, one-dimensionally encodes it or two-dimensionally encodes it to generate coded data, and sends it to the S / P converter 5. S /
The code data having a byte structure in the P conversion unit 5 is temporarily stored in the code data buffer memory 6, converted in the modulation / demodulation unit 7, and sent to the line.

Next, the general flow of data on the receiving side will be described. The transmission signal sent from the line is demodulated by the modulator / demodulator 17 and then temporarily stored in the code data buffer memory 16. The decoder 13 converts the data with the code stored in the code data buffer memory 16 into a serial signal by the P / S converter 15, and then reads and decodes the serial signal bit by bit. Then, the line drawing information signal obtained by the decoding is transferred to the line memory control unit 12
Is temporarily stored in the recording unit 11, and is recorded on the paper or the like by the recording unit 11.

Next, the generation of code data, which is one of the gist of the present invention, will be described in detail. The control unit 4 sends a start signal necessary for encoding one line to the encoder 3 to start encoding one line. As a result, the one-line encoder 3 reads the writing information signal from the line memory control unit 2 to generate code data (including a line synchronization code), and at the same time generates 1 bit of the code data to the control unit 4. Send out the clock. After the encoding of one line is completed, the encoder 3 sends 1 to the control unit 4.
A line coding end signal is sent out, and if the coded line is an all white line, an all white line signal is sent out. However, the encoder 3 does not generate and add a fill even if the generated code data does not satisfy the minimum transmission time of one scanning line (one line) determined by the pre-message procedure.

When the control section 4 detects the clock that is transmitted along with the generation of the generated code data, the control section 4 counts up the generated code counter 9 to count the number of bits of the generated code data, and at the same time, outputs the all white line signal. Is detected, the all-white scanning line counter 10 is counted up and the number of all-white lines is counted. When the control unit 4 detects the one-line coding end signal, the control unit 4 counts up the coded scanning line counter 8 to count the number of coded lines, and the count value B of the generated code counter 9 and the receiving side. When the count value B is equal to or exceeds the set bit number M, 1 is compared with a predetermined block generation code data bit number (set bit number) M in consideration of the memory capacity and the like. The number F of bits of this block fill that completes the data generation of the block and generates the fill for this block is given by the following equation.

F = [a · (Lt−Lw) + b · Lw] · A−B where F: the number of bits of fill to be generated and added a: minimum transmission time of encoded line including black Lt: code Number of coded scan lines (count value of coded scan line counter 8) Lw: Number of all white scan lines (count value of all white scan line counter 10) b: Minimum transmission time of coded all white lines A: Modulator / demodulator 7 Transmission speed B: Number of bits of generated code data (count value of generated code counter 9) In this formula, if the number of fill bits F is negative, this block satisfies the minimum transmission time. The unit 4 resets the generation code counter 9, the coding scanning line counter 8, and the all-white scanning line counter 10 without generating and adding fill bits, and performs code generation for the next block.

When the number F of fill bits is positive in the above equation, this block does not satisfy the minimum transmission time, and therefore the control unit 4 generates fill bits by the value F and S / P.
After sending out to the conversion unit 5 and inserting the fill bit into the sequence of the code data, the generated code counter 9, the coded scanning line counter 8 and the all-white scanning line counter 10 are reset. After that, the control unit 4 performs code generation for the next block. Therefore, the modulator / demodulator 7 outputs a signal in the format shown in FIG.

Next, the detection of all white lines on the receiving side and the processing after detection, which is another one of the gist of the present invention, will be described in detail.

First, the document image information signal obtained by the decoding process of the decoder 13 is temporarily stored in the line memory control unit 12 and then read out, and an all-white line detection circuit (not shown) in the recording unit 11 is read. And is transferred to a line memory (not shown) in the recording unit 11. In this case, if the all-white line detection circuit detects all-white lines, the recording unit 11 sets the frequency of the drive signal input to the recording-paper transport motor (not shown) to the normal m level, without actually recording. Double, that is, m times the frequency used when recording a line including black, and skip all white lines.

Then, the minimum transmission time b of the all-white line
And the minimum transmission time a of the line containing the black stroke information signal
And the above-mentioned value m is given by b = a / m, so that when all the code data transmitted by the transmitting side in block units indicate all white lines, when all lines in this block include black lines This block can be sent in 1 / m of the required time, and the recording time on the receiving side can be reduced to 1 / m. In this case, since the line including black is recorded at a normal speed, there is no possibility of print failure or an expensive decoder.

[0022]

As described above, according to the present invention, the first counting means for counting the data amount of the code data coded by the coding means and the number of scanning lines coded by the coding means are set. When the count value of the second counting means for counting and the count value of the first counting means reaches a prescribed value, the second count is added to the encoded data.
By providing the control means for transmitting by adding the fill bit calculated based on the count value of the counting means, one block of code data is generated every time the code data reaches the specified value, and this block is generated. Fill bits can be added in units to be transmitted from the transmission side to the reception side, the number of fill bits required to satisfy the minimum transmission time can be reduced, and the transmission efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmitting side showing an embodiment of a facsimile apparatus according to the present invention.

FIG. 2 is a block diagram of a receiving side in the embodiment.

FIG. 3 is a diagram showing an example of a format of a signal (coded data string) sent from the transmitting side in the embodiment.

[Explanation of symbols]

 3 Encoder 4 Control Unit 5 Insertion Means (S / P Converter) 8 Encoding Scan Line Counter 9 Generated Code Counter 10 All White Scan Line Counter 11 Recording Unit 13 Decoder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Narushima 2-3-8 Shimo-Meguro, Meguro-ku, Tokyo Matsushita Densen Co., Ltd. (72) Hiroaki Nouchi 2-3-8 Shimo-Meguro, Meguro-ku, Tokyo Matsushita Dentsu Co., Ltd. (72) Inventor Toshiaki Shinano 2-3-8 Shimomeguro, Meguro-ku, Tokyo Matsushita Dentsu Co., Ltd.

Claims (1)

[Claims] 1. A coding means for coding a writing information signal, a first counting means for counting the data amount of code data coded by this coding means, and a scanning coded by said coding means. When the count value of the second counting means for counting the number of lines and the first counting means reaches a specified value, the encoded data is filled with a fill value calculated based on the count value of the second counting means. A facsimile machine comprising a control means for adding a bit for transmission.