JPS60152175A - Heat-sensitive type giii facsimile receiver - Google Patents

Abstract

PURPOSE:To receive GIII mode picture signals at high speed and to record them with high quality by providing a memory temporarily storing an MODEM demodulation output and by decreasing record density under the condition of this memory being filled. CONSTITUTION:GIII mode modulation signals sent from a transmitter are demodulated by a high speed MODEM3 after coming through from a circuit 1. A demodulation signal 5 is stored in a buffer memory 7, where a transmission speed and demodulation speed are adjusted, and the demodulation signal 5 is demodulated by a demodulator 8 to be stored in a line memory 9. After completion of demodulation of one line, the demodulator 8 generates line decode completion signals and reads out the contents of the line memory 9 at this timing to transfer them as a record picture signal 12 to a shift register 13. When the buffer memory 7 is filled, by the reduction of two impression into one at the time of standard resolution degree, one line impression time is made into 1/2, avoiding overflow of the buffer memory 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat-sensitive G-axis axis receiver, and more particularly to a reception and recording system for a heat-sensitive 2/I7 axis receiver.

Description of the Prior Art One of the conventional heat-sensitive facsimile receivers is shown in FIG. In this figure, a Gl mode modulated signal 2 sent from a line 1 is demodulated by a high speed modem 3. The high-speed demodulated data 5 is once stored in the panorama memory 7 and then sent to the decoder 8, from which a decoded image signal is obtained.

This decoded image signal is once stored in the line memory 9 while being decoded, and then read out and sent to the shift register 13 as a recorded image signal 12. The decoder 8 notifies the block strobe generating section 17 that the decoding of one line has been completed by a line decoding completion signal 16, and in response to this, the block strobe generating section 17 generates a block strobe signal 18.

The thermal recording head 15 is caused to generate heat according to the image signal stored in the shift register 13. Here, the block strobe signal is a single word that enables printing of each block when one line of the thermal recording head 15 is equally divided into, for example, 8 blocks, and the printing timing of each block is staggered. . Here, numerals 14 and 19 are drivers for the thermal recording head 15 of the picture tower and the blockstor, respectively, and the fork 23 is a recording power supply for supplying electric power for recording.

On the other hand, in response to the line decoding completion gravity 16, the feed control section 20 sends a feed pulse to the motor driver 21 to drive the recording step motor 22. 10
is the control unit for the entire Uke-Imoku machine.

Now, with this method, for example, the minimum transmission time for one line is 20m8
6C17) Receive standard resolution 3.35f/rrm image signal.

When recording, the recording time for one line is set to 10 m5 to avoid deterioration of image quality, and the recording density is set to high quality resolution 7.7.
The receiving recording paper feed is set to be the same as when receiving the l/mn image signal, and the same decoded image signal is printed and recorded over two lines. In order to shorten the transmission time and not reduce the recording density,
This receiver has a minimum transmission time of 16 m per line for the transmitter.
It indicates that reception is possible even at 5 ec, and receives the image signal for this transmission time, and within 10 ms ec at the latest, the image signal for 2 lines 1/3. ．． The 85mm printing record must be completed, but the number of printing blocks must be 17.
2, and the number of dots printed per block must be doubled. However, this has the disadvantage that the stain source unit becomes larger because of the heat-sensitive recording method, which requires a large recording power supply capacity.

Conversely, in order to reduce the recording power capacity, the minimum transmission time is 1.
1/3.85mm for a received image signal of 0ms e c
If we stop printing two lines of the same image signal in the same direction and increase the print dot size only in the sub-scanning direction and record only one line, high quality resolution 7. There is also a drawback that when using 'Il/frIm, lines overlap, resulting in a drop in recorded image quality.

OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks inherent in the conventional technology.
l In a facsimile receiver.

Control of printing one line is divided into several blocks according to the number of black pixels to reduce the recording power capacity.

In addition, @ tone output is stored in a buffer memory, and even when the time required to print one line is longer than the minimum transmission time for one line, the speeds of receiving the encoded data and printing and recording the decoded image signal are matched and recorded. To avoid a decrease in density, and to reduce the density of printed records when the buffer memory is full, to avoid a state in which continuous reception is not possible, and to increase the time for procedures between pages so that there is no problem in receiving multiple pages. , a new facsimile receiver that can receive Gl mode image signals at high speed and record them with high quality by emptying the buffer memory before the next page's image signal arrives. It is about providing.

Structure of the Invention In order to achieve the above objectives, the heat-sensitive Gl facsimile receiver according to the present invention has means for transmitting the minimum receivable line transmission time to the sending IN + Thermal type GJl that counts and changes the number of recording blocks
The X.17 axis receiver is equipped with a memory for temporarily storing the demodulated output of the modem, and means for lowering the recording density under worst-case conditions such as when the memory becomes full.

That is, in a heat-sensitive Gl facsimile receiver that has means for transmitting the minimum receivable one-line transmission time to the transmitter and changes the number of recording blocks by counting the black rate of the received image signal, Even when the print recording time for one line is long, the received data is temporarily stored in the pack memory to compensate for the difference in speed, and when the buffer memory becomes full, the recording density can be changed. buffer memory oats (-flow ″′
Near true, -2゜'ffi @ K > ln r. 1, -
2°.

By generating a procedure signal that increases the procedure time and sending it to the transmitter, the buffer is emptied before reception of the image signal of the first page starts.

In this way, even a small-scale recording power supply unit can receive the Gl mode image signal at high speed and print and record without degrading the image quality.

Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

Figure 2 is a block diagram showing an example of the implementation of the present invention.
It is a diagram. In FIG. 2, functional blocks similar to those in FIG. 1 are designated by the same reference numerals as in FIG.

The control unit 10 uses the digital identification signal (D, I 8 ) to set the minimum transmission time for one line to 10 m even at standard resolution, for example.
The low-speed modem 4 modulates and informs the transmitter that it can receive data even at 5ec. A GW mode modulated signal of standard resolution and a minimum transmission time of 16 ms per line sent by the transmitter enters through the line 1 and is demodulated by the high speed modem 3. The demodulated signal 5 is once stored in the buffer memory 7, and after matching the transmission speed and decoding speed, it is decoded by the decoder 8 and stored in the line memory 9. When the decoding of one line is completed, the decoder 8 generates a line decoding completion signal 16. Line decoding completion signal 16
At the timing of generating the signal, the decoder 8 reads out the contents of the line memory 9 and transfers it to the shift register 13 as the recorded image signal 12.

First, the black pixel counter 24 counts the number of black pixels on this line. Based on this count value, the block number determining unit 25 determines the number of blocks so that the number of black pixels in each block is equal to or less than a specified number determined from the capacity of the recording electrolytic erosion unit 23 and the block length is as long as possible. . For example, if the l line is 2048 bits and the specified maximum number of black pixels in one block is 256 bits, if the number of black pixels in one line is 256 bits or less, the block number is 1 and printing is done at one timing. It ends with. When the number of black pixels in one line is 256 bits or more, if the line is divided into two and the number of black pixels in both blocks is 256 or less, the number of blocks is 2 and printing ends at timing Fi2. When the number of black pixels in one line is even larger, the number of blocks becomes 4, and then the maximum number of blocks becomes 8. When the number of blocks is 8, printing takes 8 timings, and it takes 1 time to print 1/8.85 inch n for the Fil line when receiving a standard resolution image signal.
6 timings are required, and the time required for one line printing J9r is the maximum.

Next, the block strobe generating section 27 causes the decoder 8 to
After completing the transfer of the recorded image signal for the line from the line memory 9 to the shift register 13, the block number determining unit 25
A block nutrobe signal 18 is generated in response to the number of blocks 45 and 26 determined by
The decoder 8 is notified by the d code 28.

In this way, the number of blocks changes depending on the number of point pixels and its distribution, and there may be cases where the 1-line transmission time JC91 line recording time is long, but in this case, the decoder 8 does not receive the 1-line printing completion signal 28. Knowing that there is no encoded data, the encoded data to be decoded next is stored in the buffer memory 7, and when the print completion signal 28 is received, the encoded data is read out and decoded.

However, if this state continues for as long as iJA continues, the buffer memory 7 will become full.
In such cases, for example, one line is printed twice over 1/8.85 m1n at standard resolution, but by printing it once, the time required to print one line can be reduced to %, and buffer memory overflow can be avoided. . Note that in this situation, there are few black and white transition points in the received image signal.
< This occurs when there are a large number of black pixels, and this does not occur often in general manuscripts, and overall, it is thought that the deterioration in image quality due to thinning out one line is small.

Furthermore, in order to enable the reception of multiple pages, the buffer memory 7 must have a certain amount of free space before the next image signal is transmitted. Therefore, when the reception of one page is completed, the buffer memory 7 must have some free space. It is determined whether there is enough free space to start receiving the next page based on the remaining data amount of No.7, and if there is not enough free space, for example, the time required for the procedure between multiple pages is lengthened.

FIG. 3 shows the inter-page signals of the conventional system. After transmitting the image signal MIGSSAGE, the transmitter 29 transmits the message rear end signal TC and the multiple page signal ↓S, and receives these signals. The receiver 30 receives the message confirmation signal M
CF is sent to transmitter 29. After that, the transmitting magnetic field 9 sends the image signal of the next page, so the receiver 30 decodes and prints the remaining data in the buffer memory 7 within the time of the two procedure signals, the multiple page signal UPS and the message confirmation signal MCF. However, if it is determined that this amount of time is not sufficient, a positive IJ) rain signal 'I'P is sent to the transmitter 29 instead of the message confirmation signal MCF, as shown in FIG.

In this way, the transmitter 29 transmits the digital command signal DO8° training and training check signal 'I'1 (
AINING, TCP All sending L, Kotc tt Reception 1t”j Tele reception 4N Machine 30Jd Reception preparation confirmation signal CF
I sent R and did not return it. After that, the transmitter 29 sends the image signals T) INI NG and MID S SAUE for the next page, so the procedure +t11 is DO8.

TI included INING・TCii' becomes longer by CFIL, and during this time the receiver 30 decodes and prints the remaining 9 data in the pan 7 memory, expanding the free space.0 Effects of the Invention - The present invention According to the above, by taking the precautions described above, it is possible to receive GI mode image signals at high speed and record them with high quality without increasing the capacity of the recording unit. 0

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional heat-sensitive two-Gl facsimile receiver, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a multi-page reception of a conventional heat-sensitive facsimile receiver. Diagram showing procedure No. 16 between pages of time, No. 4
The figure shows inter-page procedure signals in an embodiment of the present invention.01...Line, 2...High speed or low speed modulation signal, 3...High speed modem, 4...Low speed modem, 5...・
・High-speed demodulation data, 6...Low-speed transmission/reception data, 7...
・Buffer memory, 8...Decoder, 9...Line memory, IO...Control unit, 11...Panzer memory control 1 bar number, 12...Record image signal, 13...Shift Register, 14... Image signal driver, 15... Thermal recording head, 16... Line decoding completion signal, 17.
...Block strobe generator, 18...Block strobe signal, 19...Block driver, 20...
- Feed control unit, 21... Motor driver, 22... Recording feed motor, 23... Recording power supply unit, 24... Black pixel counter, 25... Block number determining unit, 26... Block number Signal, 27...
Block strobe generator, 28... Print completion signal, 29... Gl facsimile transmitter, 30... Thermal Gji [facsimile receiver, MESSAGE...
・Gl mode modulation image signal, RTC...message rear end signal, MPS...multiple page number 100, MCF...message confirmation signal, RTP...positive IJ) rain signal, DC8...digital command Signal, 'L'RAI
N ING, 'l'cF...Training/Training Check No. 16, CFR...Receiving readiness confirmation signal Patent applicant Nippon-Ki Co., Ltd. Agent Patent attorney Yutabe Kumagai "--1-"

Claims (1)

[Claims] (18 heat-sensitive Gl facsimile receivers having means for transmitting the minimum transmission time of one line that can be received to the transmitter and changing the number of recording blocks by counting the error rate of the received image ID) , a memory for temporarily storing the demodulated output of the modem;
A heat-sensitive Gl facsimile receiver characterized in that it has means for lowering the recording density under worst-case conditions such as when the memory becomes full. (2) Claim 1 further characterized in that it includes means for generating a procedure signal that increases the time between pages when receiving a plurality of pages and transmitting it to the transmitter.
1) The heat-sensitive 2-Gl noaxioli receiver described in item 1).