JP2864317B2 - Facsimile system - Google Patents

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 communicating pixel data.

[0002]

2. Description of the Related Art Conventionally, when starting communication of pixel data, a facsimile apparatus of this kind transmits a training signal to a receiving side at a predetermined communication speed in consideration of communication capabilities of a transmitting side and a receiving side. If the data can be received by the receiving side, the pixel data is read from the original one line at a time and transmitted. If the received pixel data cannot be received properly on the receiving side due to deterioration of the line condition, etc., and the reception becomes poor, the communication speed is reduced by one step and the training signal is transmitted again to confirm the normal reception. In addition, the pixel data of the next page is transmitted at the communication speed reduced by one step.

[0003]

However, a reception failure occurs when a document is transmitted, and the communication speed at which the document of the next page is lowered by one step.
Even if transmitted in degrees, there is a possibility that reception failure occurs partially again receiving side by deterioration of line condition, der if the previous line replacement function is provided to the receiving side when the
Even so, there is a problem that the quality of the recorded image is degraded because the pixel data one line before the normal reception is replaced with the defective reception part and recorded.

Accordingly, the present invention provides a receiving facsimile apparatus.
Reception error of the pixel data in the location, that is, the reception error
If the Rain occurs picture quality is deteriorated, and an object thereof is to prevent deterioration in the image quality of the document of the next page to be recorded on the recording paper.

[0005]

Means for Solving the Problems The present invention to solve such problems, the image quality indicating the abnormality of the image quality based on the number of receive error line at the end of reception of one page of the pixel data of originals The receiving side facsimile apparatus is provided with abnormality notifying means for notifying the abnormal information, and the transmitting means for transmitting the pixel data of the next page of the document as high-resolution data in the upper communication image quality mode based on the image quality abnormal information is provided on the transmitting side. It is provided in a facsimile machine.

[0006]

[Action] If the reception error line upon reception of pixel data has occurred, the image quality abnormality information is reported on the basis of the received error line number When receiving is completed for one page of the pixel data of the originals. In this case, the pixel data of the next page is transmitted as high-resolution data in the upper communication image quality mode. Therefore, even if a reception error line occurs when the receiving apparatus receives the next page of pixel data, high-resolution
Since the pixel data is transmitted and received , deterioration of the quality of the recorded image is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a facsimile system according to the present invention.
Is a block diagram showing an embodiment of that facsimile machine. In the figure, 1 is a CPU for controlling the entire facsimile apparatus, 2 is a line such as a telephone line, 3 is a dial signal generation circuit for generating a dial signal to be transmitted to the line 2, 4
Is a modem that sends and receives facsimile information such as pixel data,
5 is a voice message circuit for generating a voice message to be output to the line 2, 6 is an incoming call detection circuit, 7 is a 16HZ ringer generation circuit, and 8 is a hook switch. Reference numeral 9 denotes an image sensor that reads information of a set document and converts it into pixel data. 10 denotes a thermal head that records received pixel data on recording paper (not shown). 11 denotes a dial key. 12 denotes facsimile communication. Is a memory for storing received or transmitted pixel data, 14 is a display circuit, and 15 is a speaker. Reference numeral 16 denotes a recording paper detection sensor for detecting the presence or absence of recording paper, 17 a recording paper cover detection sensor for detecting whether or not a lid (not shown) of a storage unit for storing the recording paper is opened;
20 to 20 are contacts, 21 is a transformer, and 22 is a built-in telephone. The built-in telephone 22 includes a contact 30, a ringer 31, a communication circuit 32, and a handset 33, which are interlocked with the operation of the hook switch 8.

This facsimile apparatus can automatically switch between a call mode and a facsimile mode. In the call mode, the contacts 18, 19 and 30 are all on the b side, and the contact 20 is on the a side. Has been switched to. In this case, when the incoming signal arrives at the line 2, the incoming signal is sent to the built-in telephone 22 via the contacts 18 and 19, and as a result, the ringer 31 sounds to notify the incoming. Then, the contact 30 is switched to the side a by the off-hook of the built-in telephone 22, and a call with the other party is started.

In the facsimile mode, line 2
Is received by the incoming call detection circuit 6 and transmitted to the CPU 1. When the incoming call is notified, the CPU 1 switches the contact 19 to the side a and responds to this, and drives the voice memory circuit 5 to transmit a voice message to the effect that facsimile communication is performed to the line 2. And
The CPU 1 performs a predetermined communication protocol via the modem 4 with the partner device which starts facsimile communication in response to the transmission of the voice message. After the completion of the communication protocol, the CPU 1 receives pixel data transmitted from the partner device line by line. The received pixel data is decoded and stored in the memory 13, while the head 10 is controlled to record on the recording paper. This facsimile apparatus has a front line replacement function, and automatically records the pixel data of one line before when an error occurs when receiving pixel data (previous line replacement means).

To transmit a facsimile in the facsimile mode, a document is set and the dial key 11 is operated. Then, the CPU 1 stores this as a dial number in a predetermined area of the memory 13, and when the communication key 12 is subsequently operated, the contact 18 and the contact 19 are switched to the a side to capture the line 2 and store it. The dial number is transmitted from the dial signal generation circuit 3 to the line 2 as a dial signal. After completion of the transmission of the dial signal, the CPU 1 switches the contact 18 to the side b, and when the other party responds, after passing through a predetermined communication protocol, reads the pixel data line by line from the original and sends the data to the partner device via the modem 4 and the line 2. To send to.

FIG. 2 is a flowchart showing a detailed operation of the CPU 1 when communicating pixel data in the facsimile apparatus. That is, when a call is made to the partner device on the receiving side and the partner device answers, a predetermined communication protocol is performed with the partner device as described above. When the communication protocol ends, in step ST1, a training signal is transmitted to the partner device at a communication speed determined in the communication protocol. continue,
It is determined in step ST2 whether the transmitted training signal has been normally received on the receiving side. If the training signal is not received normally due to the poor state of the line 2, the communication signal is reduced by one step and the training signal is transmitted again.

If the training signal is normally received on the receiving side and the determination in step ST2 is "Y",
In step ST3, pixel data of the document is transmitted line by line at the same communication speed as the training signal.
Then, on the receiving side, the pixel data is received line by line and stored in the memory 13, and if the pixel data is normally received, it is recorded on a recording paper. Also, pixel data is partially
, And a pixel data reception error occurs.
When a reception error line is generated, this is stored and the pixel data received one line before is recorded by the above-described previous line replacement function. In this manner, the pixel data is received and recorded line by line, and when the reception of pixel data for one sheet of the document is completed, the receiving side detects the number of stored reception error lines, and if there is a reception error, the recorded image is recorded. An abnormal signal indicating abnormal image quality is reported to the transmitting side as abnormal image quality (abnormality notifying means), and if there is no reception error line, a normal signal is returned to the transmitting side.

The transmitting side detects these signals returned from the receiving side, and determines whether or not the reception result is normal in step ST.
Judge at 4. As a result of this determination, if it is determined that the reception result on the receiving side is not normal, the process proceeds to step ST5, and the training signal is transmitted to the receiving side again without reducing the communication speed. When the training signal is normally received on the receiving side and the determination in step ST6 is “Y”, it is determined that the image quality has been improved in step ST7, and if the image quality has been improved, this is held. As it is, if the image quality has not been improved, the image quality is switched in step ST8 to switch the communication image quality mode from, for example, the normal mode as the lower communication image quality mode to the fine mode as the higher communication image quality mode, and the process returns to step ST3. In this case, in step ST3, the next page of the document is transmitted in the fine mode to improve the image quality (transmission means).

As a result, if the pixel data is normally received on the receiving side, the pixel data is recorded on the recording paper, and the pixel data cannot be normally received and the receiving side has the above-described front line replacement function. If so, the pixel data of the previous line stored in the memory 13 is recorded on the recording paper. As described above, when the pixel data of a certain page of the document cannot be received normally, the pixel data of the next page is transferred in the fine mode (upper communication image quality mode) in which the sub-scan has twice the resolution of the normal mode. since the original pixel data to be transmitted to the read recipient, even if reception error line occurs at the receiving side this time, Fainmo
The previous line replacement width at the time of loading is replaced by the high-resolution pixel data of the previous line in the sub-scanning direction which has already been received normally and stored in the memory 13, and as a result of printing, the previous line replacement in the normal mode is obtained. With half the replacement width
Become. Even if a receiving error line occurs on the receiving side,
The width of the communication error line is abnormal reception in normal mode
Of the receiving error line due to the
Deterioration can be prevented.

In this manner, one original is transmitted in the fine mode, which is the higher-level communication image quality mode.
Is "Y" in step ST9, if "image quality has already been reduced" is determined in step ST9, and if image quality has not been reduced, the process proceeds to step ST10 to change the communication image quality mode to, for example, the fine mode. Then, the image quality is switched to the lower communication image quality mode, i.e., the normal mode, and the process returns to step ST3 to transmit the next page of the original to be transmitted in the normal mode. The pixel data of the first page or the like of the original transmitted in the normal mode cannot be further reduced in image quality if the reception result is normal and “Y” is determined in step ST4. The determination of "image quality already down" in ST9 is "Y", and therefore, in this case, the pixel data of the next page in step ST3 is transmitted in the normal mode. If the reception result of the document is not normal and the training signal transmitted at the same communication speed is not normally received and is determined to be “N” in step ST6, the transmission baud rate is reduced in step ST11, That is, the communication speed is reduced by one step, and at the same time step ST12
In this case, the training signal is transmitted at the communication speed reduced by one step, and then the pixel data is transmitted at the same communication speed.

[0016] Thus, in this embodiment, when the pixel data of a certain page of the document can not be received correctly at the receiving side, if allowed to up the image quality of the pixel data of the next page to be transmitted in the same communication speed It is intended to be transmitted. When pixel data of a certain page of a document is transmitted, if a reception failure occurs partially on the receiving side, the same page can be retransmitted without increasing the image quality while maintaining the same communication speed. .

[0017]

As described above, according to the present invention, if the resulting receiving error line when receiving the pixel data, based on said received error line number When receiving is completed for one page of pixel data of the original manuscript While reporting abnormal image quality information,
In this case, the next page of pixel data is transmitted as high-resolution data in the upper communication image quality mode. Therefore, even if a reception error line occurs when the receiving apparatus receives the next page of pixel data, the high- resolution pixel data is transmitted. Send
Since the reception is performed, it is possible to prevent the quality of the recorded image from deteriorating.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing an operation of the facsimile machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 Line 3 Dial signal generation circuit 4 Modem 6 Incoming detection circuit 9 Image sensor 10 Thermal head 11 Dial key 12 Communication key 13 Memory 16 Recording paper sensor

Claims (1)

(57) [Claims] A transmission facsimile apparatus for reading pixel data on a document line by line and transmitting the data;
A facsimile device that receives pixel data transmitted from a facsimile device and records it on recording paper.
In the millimeter system, the receiving facsimile apparatus, receives at the end of reception of one page of pixel data of the document
Abnormality notification means for notifying the transmission facsimile apparatus of image quality abnormality information indicating image quality abnormality based on the number of error lines , and the transmission facsimile apparatus transmits pixel data of the next page of the document based on the image quality abnormality information. facsimile characterized in that example Bei transmission means for transmitting the high-resolution data with higher communication quality mode
System .