JPH06245048A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To prevent the deterioration of picture quality in a succeeding page original to be recorded on recording paper at the time of the deterioration of picture quality because of the occurrence of an reception error in picture data by providing an abnormality reporting means in a reception side facsimile equipment and a specified transmitting means in a transmission side facsimile equipment. CONSTITUTION:Picture data cannot be normally received at a reception side, a line replacing function is provided at the reception side and a one-line preceding picture element to be stored in a memory is recorded on recording paper. In the case when picture data in some page of the original cannot be normally received, picture quality data of the original in succeeding page picture element data is read by a fine mode which respectively has twice as much resolution in main scanning and subscanning as a normal mode does so as to be transmitted to the reception side. Therefore, even if the reception error occurs at the reception side, data is normally and already received, stored in the memory and replaced with one-line preceding data with high resolution in a subscanning direction so that a recording result becomes the same as that of normal reception by the normal mode and recording picture quality is held.

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, this type of facsimile apparatus first transmits a training signal to a receiving side at a predetermined communication speed in consideration of the communication capabilities of the transmitting side and receiving side devices. If this is receivable on the receiving side, then the pixel data is read line by line from the original and transmitted. If the transmitted pixel data cannot be received normally on the receiving side due to the deterioration of the line condition and the reception becomes defective, the communication speed is further reduced and the training signal is transmitted again to confirm normal reception. In addition, the pixel data of the next page is transmitted at the communication speed which is further reduced.

[0003]

However, a reception failure occurs during the transmission of an original, and the original of the next page is further reduced at the communication speed, or even if the original is transmitted at the same communication speed, it is received again due to the deterioration of the line condition or the like. If there is a possibility that a reception failure will partially occur on the receiving side, and the receiving side is equipped with the previous line replacement function at this time, the normally received pixel data of one line before is replaced with the reception failure portion and recorded. Therefore, there is a problem that the quality of the recorded image deteriorates.

Therefore, an object of the present invention is to prevent the deterioration of the image quality of the original of the next page recorded on the recording paper when the pixel data reception error occurs and the image quality is deteriorated.

[0005]

In order to solve such a problem, the present invention provides a front line replacing means for replacing and recording with a front line when a reception error occurs during reception of pixel data, and the original document. An abnormality notifying unit for notifying the image quality abnormality information indicating the image quality abnormality based on the reception error at the end of reception of one page of the pixel data, and the original of the document based on the image quality abnormality information. The transmitting side facsimile apparatus is provided with a transmitting means for transmitting the pixel data of the next page as high resolution data in the higher communication image quality mode.

[0006]

When a reception error occurs during the reception of pixel data, it is replaced with the previous line and recorded, and when the reception of the pixel data for one page of the original is completed, the image quality abnormality information is notified based on the reception error. To be done. In this case, the pixel data of the next page is transmitted as high resolution data in the higher communication image quality mode. Therefore, even if a reception error occurs when the receiving side device receives the pixel data of the next page, it is replaced with the high resolution pixel data which is the data of the previous line which has already been normally received, so that the quality of the recorded image is deteriorated. Is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus according to the present invention. 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 sent to the line 2, and 4 is a facsimile information such as pixel data. A modem 5 for generating a voice message to be output to the line 2, 6 for an incoming call detection circuit, 7 for a 16Hz ringer generation circuit, and 8 for a hook switch. Further, 9 is an image sensor for reading the information of the set document to be pixel data, 10 is a thermal head for recording the received pixel data on a recording sheet (not shown), 11 is a dial key, and 12 is a facsimile communication. Is a communication key, 13 is a memory for storing received pixel data or transmitted pixel data, 14 is a display circuit, and 15 is a speaker. Further, 16 is a recording paper detection sensor that detects the presence or absence of recording paper, 17 is a recording paper lid detection sensor that detects the presence or absence of a cover (not shown) of the storage unit that stores the recording paper, and 18 to 20 are contacts. 21 is a transformer
22 is a built-in telephone. The built-in telephone 22 includes a contact 30 and a ringer 3 which are linked with the operation of the hook switch 8.
1, a call circuit 32, and a handset 33.

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

In the facsimile mode, the line 2
When an incoming signal arrives at, the incoming signal is detected by the incoming detection circuit 6 and transmitted to the CPU 1. When the CPU 1 is notified of the incoming call, it switches the contact 19 to the side a and responds to this by driving the voice memory circuit 5 to send a voice message to the line 2 to the effect that facsimile communication will be performed. And
In response to the transmission of the voice message, the CPU 1 performs a predetermined communication protocol with the partner device which starts the facsimile communication via the modem 4, and after the completion of this, receives the pixel data transmitted from the partner device line by line. While the received pixel data is decoded and stored in the memory 13, the head 10 is controlled to record on the recording paper. Note that this facsimile apparatus has a front line replacement function and automatically records the pixel data of one line before when an error occurs during reception of pixel data (previous line replacement means).

When transmitting a facsimile in the facsimile mode, the original 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 are stored. The dial number is sent from the dial signal generation circuit 3 to the line 2 as a dial signal. After sending the dial signal, the CPU 1 switches the contact 18 to the side b, and when the other party responds, the pixel data is read line by line from the original document after a predetermined communication protocol, and the other party's device is read through the modem 4 and the line 2. I am trying to send it to.

Next, FIG. 2 is a flow chart showing the detailed operation of the CPU 1 when communicating pixel data in this facsimile apparatus. That is, when a call is made to the called party device and the called device responds, a predetermined communication protocol is performed with the called device as described above. Then, when the communication protocol ends, in step ST1, the training signal is transmitted to the partner device at the communication speed defined in this communication protocol. continue,
In step ST2, it is determined whether or not the transmitted training signal is normally received by the receiving side. Then, when the state of the line 2 is bad and the training signal is not normally received, the communication speed is further reduced 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, the pixel data of the original 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 when it is normally received, it is recorded on a recording paper. If a reception error occurs, this is stored and the pixel data received one line before is recorded by the previous line replacement function. In this way, the pixel data is received and recorded line by line, and when the reception of the pixel data for one sheet of the document is completed, the receiving side detects the above received error information and if there is a received error, the recorded image An abnormal signal indicating that the image quality is abnormal is notified to the transmitting side (abnormality notifying means), and if there is no reception error, the normal signal is returned to the transmitting side.

At the transmitting side, these signals returned from the receiving side are detected to determine in step ST whether or not the reception result is normal.
Judge with 4. As a result of this determination, when 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 again to the receiving side without reducing the communication speed. When the training signal is normally received on the receiving side and the determination in step ST6 is "Y", "already image quality is improved" is determined in step ST7, and if the image quality is improved, this is held. If the image quality has not been improved, the image quality is switched in step ST8, for example, from the normal mode, which is the lower communication image quality mode, to the fine mode, which is 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-mentioned front line replacement function. If so, the pixel data of one line before stored in the memory 13 is recorded on the recording paper. In this way, when the pixel data of a certain page of the original document cannot be received normally, the pixel data of the next page has a resolution twice as high in the main scan and the sub-scan as in the normal mode. Since the pixel data of the original is read and transmitted to the receiving side in the image quality mode, even if a receiving error occurs at the receiving side at this time, one line before the line in the sub-scanning direction that has already been normally received and stored in the memory 13 Since the pixel data is replaced with the high-resolution pixel data, the recording result is equivalent to that in the normal reception in the normal mode, and therefore the quality of the recorded image is maintained.

Thus, one original is transmitted in the fine mode which is the higher communication image quality mode, and step ST4
When the judgment of "Is the reception result normal?" Is "Y", it is judged in step ST9 that "the image quality has already been lowered". Is switched to the normal mode, which is a lower communication image quality mode, the image quality is reduced, and the process returns to step ST3 to transmit the page of the document to be transmitted next in the normal mode. If the pixel data of the first page or the like of the original transmitted in the normal mode has a normal reception result and is determined to be “Y” in step ST4, the image quality cannot be further reduced. The determination of "already image quality down" in ST9 is "Y", so in this case the pixel data of the next page in step ST3 is transmitted in the normal mode. Further, if the result of receiving the original is not normal, and the training signal transmitted at the same communication speed as the original is not normally received and it is determined as “N” in step ST6, the transmission baud rate is reduced in step ST11. That is, the communication speed is reduced by one step and step ST12
Then, the training signal is transmitted at the communication speed lowered by one step, and then the pixel data is transmitted at the same communication speed as this.

As described above, in this embodiment, when the pixel data of a certain page of the original document cannot be received normally at the receiving side, the pixel data of the next page is improved in image quality without lowering the communication speed. It is designed to be sent. In addition, when the pixel data of a certain page of the document is transmitted, if the reception side partially fails in reception, the same page can be retransmitted without improving the image quality while maintaining the same communication speed. .

[0017]

As described above, according to the present invention, when a reception error occurs during the reception of pixel data, the data is replaced with the previous line for recording and the reception of the pixel data for one page of the document is completed. While notifying the image quality abnormality information based on the reception error, in this case, the pixel data of the next page is transmitted as high-resolution data in the higher communication image quality mode. Even if a reception error occurs at the time of reception, since it is replaced with the high resolution pixel data of the previous line that has already been normally received, it is possible to prevent deterioration of the quality of the recorded image.

[Brief description of drawings]

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

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

[Explanation of symbols]

 1 CPU 2 line 3 dial signal generation circuit 4 modem 6 incoming call detection circuit 9 image sensor 10 thermal head 11 dial key 12 communication key 13 memory 16 recording paper sensor

Claims (1)

[Claims] 1. A facsimile apparatus for reading and transmitting pixel data on a document line by line, and receiving the transmitted pixel data for recording on a recording paper, when a reception error occurs when the pixel data is received. A front line replacing means for replacing the previous line with the previous line for recording, and an abnormality notifying means for notifying image quality abnormality information indicating an abnormality in the image quality based on the reception error at the end of reception of pixel data for one page of the document. The facsimile machine on the receiving side is equipped with a transmitting means for transmitting the pixel data of the next page of the document as high-resolution data in the higher communication image quality mode based on the image quality abnormality information. Facsimile machine.