JPH08223392A - Facsimile equipment - Google Patents

Abstract

PURPOSE: To send receive an image with high image quality or a large size by allowing a receiver to decide a line density receptible from one page of information quantity in response to a recording paper size and to inform it to a transmitter and allowing the transmitter to decide a transmission line density based on the notice and the transmission size. CONSTITUTION: A control circuit 24 controls each section and detection circuits 8, 2 detect an original and recording paper size and a read circuit 2 reads the original based on a designated line density of the circuit 24 and a recording circuit 4 records the information onto recording paper. A receiver uses a line density setting circuit 14 to set a receptible line density based on information quantity of one page depending on the destination paper size and informs it to the transmitter. The transmitter based on the notice information and the transmission size uses a transmission line density selection circuit 10 to select the line density and stores the data read by the circuit 2 to a memory circuit 18 and the data are sent. Thus, a memory size of a prescribed capacity has provision for A# size and high image quality output is attained for A4 size with a high frequency of use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus which can negotiate a linear density on the transmitter side and a linear density on the receiver side.

[0002]

2. Description of the Related Art Conventionally, according to the recommendation of ITU-T, DI
R8 × by S15, FTC bit15 of DTC signal
7.7 lines / mm and / or 200 × 200
Pixel / 25.4mm function presence / absence (0 not, 1)
And R41 × 15.4 lines /
mm Specifies the presence or absence of the function (0 is not, 1 is), and bi
The presence / absence of the function of 300 × 300 pixels / 25.4 mm (not 0, 1) is defined by t42, and R16 × 15.4 lines / mm and / or 400 × 400 pixels / 25. Presence of 4mm function (0
No, 1 is).

Further, by the bit 44 of the FIF, information on whether or not inch-based resolution is possible (0 is impossible, 1 is
Is possible) is sent to the transmitter side, and by bit45, m
The transmitter side is notified of information on whether or not m resolutions are possible (0 is impossible, 1 is possible).

Furthermore, the DCS signal FIF bit15
Depending on R8 x 7.7 lines / mm, or 200 x 2
00 pixels / 25.4 mm is designated (designated by 1), R41 × 15.4 lines / mm is designated by bit41 (designated by 1), and 3 is designated by bit42.
00 × 300 pixels / 25.4 mm is designated (designated by 1), and by bit 43, R16 × 15.4 lines / mm or 400 × 400 pixels / 25.4 m
The m is designated (designated by 1), and the bit 44 is used to select the resolution type (0 is mm resolution, 1 is inch resolution).

As described above, the resolution is specified, but these are not related to the document size and the recording paper size.

[0006]

By the way, in the conventional facsimile apparatus, the standard mode (R8 × 3.85 line / mm, fine mode (R8 × 7.7 line / mm), or super fine mode (R8 ×) is used. 1
5.4 lines / mm) was frequently used, and the document size and recording paper size were also A4 and B4.

Therefore, the maximum amount of information per page is 25.
7 × 364 × 8 × 15.4 = 1.44 Mbytes, and the maximum amount of information in the main scanning direction is 256 × 8 = 20.
It is 48 bits.

On the other hand, in LBP recording, it is 1 for constant velocity recording.
Recording is performed after the reception information of a page is stored in the memory, but the maximum information amount of one page is set to 1.5 Mbite. Further, in the case of about 8 A4 size vertical images in LBP recording, the recording time for one line is 15.4 lines / mm.
In the case where the encoded information of one page is stored in the memory and the decoding is performed in real time, the decoding time per bit is 0.
It may be 62 μs.

However, with the spread of multifunctional machines in the future, the number of cases of transmitting A3 size at R16 × 15.4 lines / mm or 400 × 400 pixels / 25.4 mm will increase. At this time, the maximum amount of information on one page is 2
It increases to 97 × 420 × 16 × 15.4 = 3.84 Mbytes. Considering that about 16 A4 size horizontal images are recorded, the recording time for one line is 15.4.
The line / mm is about 0.84 ms, and considering A3 size recording, the number of dots in the main scanning direction is 297 ×
Since 16 = 4752 bits, one page of encoded information is stored in the memory, and in the case of real-time decoding, the decoding time per bit is 0.18 μs.

[0010] In other words, according to the above situation, A3
In order to support the size equivalent to 400 dpi, there is a drawback that it becomes an expensive hardware system.

It is an object of the present invention to provide a facsimile apparatus capable of handling high resolution images and large format images with an inexpensive structure.

[0012]

According to the first to third inventions of the present application, there is provided means for notifying a transmitter of a receivable linear density corresponding to a recording paper size. The receivable linear density is determined by the amount of information on one page, and the transmitter determines the transmission linear density based on the information and the transmission size notified from the receiver.

The fourth to sixth inventions of the present application have means for informing the transmitter of the receivable linear density in the main scanning direction corresponding to the receivable length in the main scanning direction. The receiver determines the linear density in the main scanning direction that can be received from the amount of decodable information of one line within the recording period of one line, and the transmitter determines the information notified from the receiver and the main information at the time of transmission. The linear density in the main scanning direction is determined based on the length in the scanning direction.

[0014]

According to the first to third inventions described above, for example, if the receiver has a memory for receiving 2 Mbytes and recording at a constant velocity, the A4 is in the ultra fine mode (16 pel / mm).
× 15.4 line / mm) (about 1.92 Mbyte)
e) and B4 are in super fine mode (8 pel / mm
× 15.4 line / mm) (about 1.44 Mbytes)
Can be received at. A3 is fine mode (8p
el / mm × 7.7 line / mm) (0.96 Mby
te) can be received. Therefore, it becomes possible to support A3 with a fixed memory size, and A4 that is frequently used
High-quality output becomes possible, and an inexpensive A3 compatible facsimile can be realized.

According to the fourth to sixth inventions, for example, 1
If the line recording time is 0.84 ms and 3456-bit real-time decoding is possible within this time, A4 is 16 pel / mm in the main scanning direction (1 line 34
Real-time decoding up to 56 bits is possible, and B4 is 300 cpi in the main scanning direction (1 line 30
Real-time decoding up to 24 bits) is possible. In addition, A3 is capable of real-time decoding up to 8 pel / mm (2376 bits per line) in the main scanning direction. Therefore, A3 compatible processing can be performed at a predetermined decoding speed, and A4, which is more frequently used, is 16 pe.
Real-time decoding up to 1 / mm is possible, and an inexpensive A3 compatible facsimile can be realized.

[0016]

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

The reading circuit 2 is composed of an image pickup device such as a CCD (charge coupled device) and an optical system, and specifies the linear density output to the signal line 24a. Are sequentially read to create a signal string representing binary values of white and black and output from the signal line 2a.

The line density designation by the signal line 24a is as follows.
Specifically, 8 × 3.85 lines / mm, R8 × 7.7
Line / mm, 200 × 200 pixels / 25.4mm, R
8 × 15.4 lines / mm, 300 × 300 pixels / 2
5.4 mm, R16 x 15.4 lines / mm, 400 x
For the designation of 400 pixels / 25.4 mm, "0",
It is assumed that "1", "2", "3", "4", "5", "6" are output to the signal line 24a.

The recording circuit 4 inputs the data output to the signal line 6a according to the designation of the recording paper output to the signal line 24b and the designation of the recording linear density, and sequentially records one line at a time for one page. It records at a constant speed. Therefore, recording is started in a state where the recording information of one page is complete.

To specify the recording paper and the recording linear density, specifically, when the output of the signal line 24b is represented by two characters ab, A4 is A4, a1 is B4, a. If 2, specify A3, if b is 0, R8 x 3.85 lines / mm, if b is 1, R8 x 7.7 lines / mm, b
If 2 is 200 × 200 pixels / 25.4 mm, if b is 3 R8 × 15.4 lines / mm, if b is 300 × 3
00 pixels / 25.4 mm, if b is 5, R16 x 15.4
Line / mm, if b is 6, 400 × 400 pixels / 25.
4 mm shall be specified.

The encoding / decoding circuit 6 MR-codes the read data output to the signal line 2a with K = 8,
The data is stored in the memory circuit 18 via the signal line 24c, the control circuit 24, and the signal line 24d. Then, when the memory transmission is selected, the information stored in the memory circuit 18 is input, encoded again by the control circuit 24 if necessary, and output to the modulator / demodulator 20 via the signal line 24e. Further, at the time of reception, the demodulated data of the signal line 24e is input, and if necessary, MR coding of K = 8 is performed again by the control circuit 24, the MR code is stored in the memory circuit 18 via the signal line 24d, and one page worth of data is stored. After the information is stored in the memory circuit 18, the stored information is input through the signal line 24d, the control circuit 24, and the signal line 24c to perform decoding in real time, and the decoded data is output to the signal line 6a. Recording is performed sequentially.

The original size detecting circuit 8 is a circuit for detecting the size of the currently set original, and outputs information on the original size to the signal line 8a. Specifically, the signal "0" for A4 size, the signal "1" for B4 size,
If the size is A3, the signal "2" is output.

When the standard mode is set, the transmission line density selection circuit 10 outputs a signal "0" to the signal line 10a, and the fine mode, super fine mode, semi-ultra fine mode and ultra fine mode are set in order. Then, the signal “1” is output to the signal line 10a,
Outputs "2", "3", "4".

The recording paper size detection circuit 12 is a circuit for detecting the currently set recording paper size, and in the present embodiment, three cassettes can be set. Specifically, information of 3 dots is output to the signal line 12a, and A4 and B are sequentially output.
4 shows the presence or absence of A3 recording paper. That is, 1 is output with the recording paper and 0 is output without the recording paper.
If there are 4 and B4 recording sheets and there is no A3 recording sheet, 110 is output.

The linear density setting circuit 14 is a circuit for setting the receivable linear density corresponding to the recording paper size, and this information is output to the signal line 14a. Here, for example, reception,
Assuming that the memory capacity for constant-speed recording is fixedly 1 Mbyte, A4 can be in standard, fine and super fine modes, and B4 and A3 can be in standard and fine modes.

The linear density setting circuit 16 is a circuit for setting the receivable linear density in the main scanning direction corresponding to the recording paper size, and this information is output to the signal line 16a. Here, if real-time decoding up to 3500 bits per line is possible, A4 can be in standard, fine, superfine, and semi-ultrafine modes, and B4
Is available in standard, fine, superfine, and semi-ultrafine modes, and A3 is available in standard, fine, and superfine modes.

The memory circuit 18 receives the K signal when transmitting and receiving.
= 8, a memory circuit used to store MR encoded data of = 8, which is input or output via a signal line 24d.

The modulator / demodulator 20 uses the well-known ITU-T Recommendation V.34. 21, V.I. 27 ter, V.I. 29, V.I. 17 is a circuit that performs modulation / demodulation based on the recommendation, and these modes are also set through the signal line 24e, and transmission data is input through the signal line 24e, and the information modulated in the specified mode is input to the signal line. The reception information output to the signal line 20a is output to the signal line 20a, the demodulated data is demodulated in the designated mode, and the demodulated data is output to the signal line 24e.

In order to use the telephone network for data communication and the like, the NCU 22 connects to the terminal of the circuit, controls the connection of the telephone switching network, switches to the data communication path, and maintains the loop. To do. Here, during communication, the signal line 2
0a and the signal line 22a are connected, and the signal line 22a is a telephone line.

The control circuit 24 controls the entire facsimile apparatus according to this embodiment, and particularly performs the following control in the first embodiment of the present invention.

First, upon reception, the receivable linear density corresponding to the recording paper size is notified to the transmitter. here,
Receivable line density is determined by the amount of information on one page.
Further, it is assumed that a memory for receiving and recording at a constant speed is separately provided and has 1 Mbytes.

In the first embodiment, the A4 size can be standard, fine or super fine mode,
Semi-Ultra Fine, Ultra Fine is impossible,
B4 and A3 sizes are available in standard and fine modes, but not superfine, semi-ultrafine or ultrafine. The receiver notifies the transmitter of this information.

Specifically, the conventional DIS bit15,
bit41, bit42, and bit43 are applied to A4 size, and the content of the linear density in this order newly adds bit66,
Provide bit67, bit68, and bit69, and set this to B
Applicable to 4 sizes, bit70, bit71, b
It73 and bit74 are provided and applied to A3 size. The bit 72 is an extension field.

On the other hand, at the time of transmission, the transmission line density is determined based on the information and the transmission size notified from the receiver as described above, and the transmission line density is DCS bit15, bit4.
1, bit 42, and bit 43 are designated, and the type of resolution is designated by bit 44.

Before explaining the specific operation of the above control, which recording paper size and linear density can be received, that is, 1 according to the memory capacity of the page memory for receiving and recording at a constant speed, that is, 1 Whether pages can be stored will be described with reference to FIG.

Here, in general, the amount of used memory is smaller when using encoded data than when using one page of information as raw data, but it exceeds the amount of raw data depending on the type of image information. For this reason, when encoded, if there are more lines than the raw information amount, one line of raw data is stored in the memory, so the maximum information amount of one page is the information amount of the raw data.

The A4 size has a transmission size of 216 m.
m × 297mm, B4 size is 256 as transmission size
mm × 364 mm, A3 size is 30 as transmission size
It is 4 mm x 420 mm.

When the information amount of the raw data at each resolution is calculated corresponding to these sizes, if it is A4 size, it is R8.
× 7.9 line / mm 0.49 Mbytes, 200
× 200 pixels / 20.5 mm, 0.50 MB,
When R8 x 15.4 lines / mm, 0.99 MB,
1.12 MB for 300 x 300 pixels / 25.4 mm, 1.98 MB for R16 x 15.4 lines / mm
Byte, 1.400 when 400 x 400 pixels / 25.4 mm.
It will be 99 Mbytes.

Similarly, in the case of B4 size, 0.72, 0.72, 1.44, 1.62, 2.8 in the same resolution order.
7 and 2.89 Mbytes, and for A3 size, 0.98, 0.99, 1.97 and 2.2 in the same resolution order.
It becomes 3,3.93, 3.96 Mbytes. For this reason, as described above, in the case of the first embodiment in which the page memory for reception and constant velocity recording has 1 M bytes as a fixed area, an example of determination as to whether the control circuit 24 is possible or not is possible. Becomes

Note that FIG. 2 shows examples of page memory capacities of 2 Mbytes, 0.5 Mbytes, and 4 Mbytes.

Next, the operation of the first embodiment of the present invention having the above construction will be described. 3 and 4 are flowcharts showing the control operation of the control circuit 24. The linear density setting circuit 16 is not used in the first embodiment.

First, in S32 and S34, it is determined whether transmission or reception is selected. If reception is selected, the process proceeds to S38, if transmission is selected, the process proceeds to S48, and neither is selected. The process proceeds to S36, and other processing is performed.

In S38, the information of the signal line 14a is input, and since it is considered here that 1 Mbytes can be fixedly used as a receiving and recording page memory, A4 is used.
Standard, fine and super fine modes are available for receiving and recording in size, and standard and fine modes are available for receiving and recording in B4 size and A3 size.

Step S40 represents a pre-procedure. Here, as the FIF signal of DIS, bit15 is 1, bit
41 is 1, bit 42 is 0, bit 43 is 0, bit 6
6 is 1, bit67 is 0, bit68 is 0, bit69
0, bit70 is 1, bit71 is 0, bit73 is 0, bit74 is 0
Notify that standard, fine, and super fine can be received and recorded in size, and standard and fine modes can be received and recorded in B4 and A4 sizes.

At S42, DCS is performed via the signal line 24b.
Set to record with the recording paper size and linear density specified in.

S44 represents the reception and recording of the image signal. Received information is once decoded and stored as MR encoding of K = 8, but if the encoded amount of one line exceeds the number of bits of raw data of one line, it is stored in memory as uncompressed (raw data). . Here, after receiving one page,
Record LBP at a constant speed. Next, in S46, a post-procedure is performed, and the process returns to S32.

On the other hand, when the transmission is selected, the pre-procedure is performed in S48. Here, for example, the DIS signal of S40 is received. Next, in S50, the information of the signal line 8a is input, and the document size is determined. If the document size is A4, the process proceeds to S62, and if it is A3 or B4 size, the process proceeds to S52.

In S52, the information of the signal line 10a is input, the selected line density on the transmitter side is judged, and if it is the standard mode, the reading in the standard mode is designated by the DCS signal in S54 (the FIF of the DCS signal is designated. Bits 15, 41, 4
2 and 43 are all set to 0), and the reading circuit 2 is designated by the signal line 24a.

In the fine mode, super fine mode, semi-ultra fine mode, and ultra fine mode, the receiver can read up to the fine mode. Therefore, in S56, the reading in the fine mode is designated by the DCS signal (DCS signal). Signal FIF bit
15 is 1 and bits 41, 42, 43 are 0)
In addition, the reading line 2 is designated by the signal line 24a.

Thereafter, in S58, the image signal is read and transmitted, and in S60, the post-procedure is performed, and the process returns to S32.

Further, in S62, the information of the signal line 10a is inputted and the selected line density on the transmitter side is judged. If it is the standard mode, the process proceeds to S54, and if it is the fine mode, S56.
Go to, and if the super fine mode, semi-ultra fine mode, ultra fine mode, the receiver can read up to super fine mode,
DC reading in super fine mode in S64
Designated by S signal (bit 15 and 4 of FIF of DCS signal)
2 and 43 are set to 0, and bit 41 is set to 1), and are designated by the reading circuit 2 by the signal line 24a.

Next, a second embodiment of the present invention will be described.

In the second embodiment, the page memory for reception and recording is also used as the memory for the timer memory transmission proxy reception, etc., and based on the memory capacity which can be used as the page memory for reception and recording at that time. Then, as shown in FIG. 2, the linear density that can be received and recorded is changed according to each recording paper size.

That is, for example, if the memory capacity usable as a page memory for reception and recording is 4 Mbytes, the standard for all A4, B4, and A3 sizes,
Fine, super fine, semi ultra fine,
It is possible to receive in Ultrafine mode, and the DIS signal FIF bit15, 41, 42, 43, 66, 6
7, 68, 69, 70, 71, 73, 74 are all set to 1.

If the memory capacity usable as a page memory for receiving and recording is 2 Mbytes, A
4 sizes can be received in standard, fine, superfine, semi-ultrafine and ultrafine modes, and B4 size can be received in standard, fine, superfine and semiultrafine modes.
3 sizes are available in standard, fine and super fine modes, and DIS signal FIF bit15, 4
1, 42, 43, 66, 67, 68, 69, 70, 7
1, 73, 74 are sequentially 1, 1, 1, 1, 1, 1, 1,
0, 1, 1, 0, 0.

Further, when the memory capacity usable as the page memory for receiving and recording is 1 Mbyte, it is as described in the first embodiment, and the memory capacity usable as the page memory for receiving and recording is Assuming that the size is 0.5 Mbytes, A4 size can be received in the standard and fine modes, B4 and A3 sizes can be received only in the standard mode, and the DIS signal FIF bits 15, 41, 42, and 4 can be received.
3, 66, 67, 68, 69, 70, 71, 73, 74
Are 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Set to 0. In the second embodiment, neither the linear density setting circuits 14 nor 16 are used.

Next, a third embodiment of the present invention will be described.

In the third embodiment, the receivable linear density in the main scanning direction is notified to the transmitter in correspondence with the receivable main scanning direction length. Here, the receivable main scanning direction is determined from the decodable information amount of one line within the recording period of one line.

Further, the transmitter determines the linear density in the main scanning direction based on the information notified from the receiver and the length in the main scanning direction at the time of transmission. Here, the receiver side enables real-time decoding up to 3500 bits per line.

In this embodiment, the linear density in the main scanning direction that can be received in correspondence with the recording paper size is registered in the linear density setting circuit 16. Also, this third
In the embodiment, the linear density setting circuit 14 is not used.

FIG. 5 is an explanatory view showing the receivable linear density in the main scanning direction corresponding to the recording paper size.

Here, the number of dots at each linear density corresponding to each length in the main scanning direction of A4, B4, and A3 sizes is obtained. If this is 3500 bits or less, it is judged that real-time decoding is OK, that is, receivable. . In addition, reception,
At the time of recording, the received data is once MR-encoded with K = 8 and stored in the memory.
When the number of bits of the raw data (uncompressed data) of the line is exceeded, the raw data is stored in the memory, so the maximum information amount of one line is the raw data.

FIGS. 6 and 7 are flow charts showing a part of the control operation of the third embodiment which is different from that of the first embodiment (FIGS. 3 and 4).

In FIG. 6, S70 is YES in S32.
Is represented. Then, in S72, the information of the signal line 16a is input. Here, it is registered in the linear density setting circuit 16 that real-time decoding can process up to 3500 bits per line. Further, when the coding amount of one line is larger than uncompressed (raw data), the raw data is stored in the memory. Therefore, referring to FIG. 5, A4 size reception and recording are standard, fine, super fine, It is possible in semi-ultrafine and ultrafine modes, and B4 size reception and recording are possible in standard, fine, superfine and semiultrafine modes. In addition, A3 size reception and recording are possible in standard, fine, and super fine modes.

Next, in S74, a pre-procedure is performed. Here, since the reception and recording for each recording paper size are the contents shown in S72, bit1 is set as the FIF of the DIS signal.
5, 41, 42, 43, 66, 67, 68, 69, 7
0, 71, 73, 74 in this order 1, 1, 1, 1, 1, 1, 1.
Transmits 1, 0, 1, 1, 0, 0. After this, in S76, the process proceeds to S42.

Further, in FIG. 7, S78 represents S48. Then, in S80, the information of the signal line 8a is input to determine the document size.
If it is 82 or B4 size, it proceeds to S96, and if it is A3 size, it proceeds to S98.

In S82, the information of the signal line 10a is inputted, the selected line density on the transmitting side is judged, and if it is the ultra fine mode, the reading in the ultra fine mode is designated by the DCS signal in S84 (the DCS signal The bits 15, 41, 42, and 43 of the FIF are set to 0, 0, 0, 1), and the reading circuit 2 is designated by the signal line 24a.

Further, in the semi-ultra fine mode, the reading in the semi-ultra fine mode is designated by the DCS signal in S86 (bit 1 of FIF of the DCS signal).
5, 41, 42, 43 are set to 0, 0, 1, 0), and the reading circuit 2 is designated by the signal line 24a.

In the super fine mode,
DC reading in super fine mode in S88
Designated by S signal (bit 15 and 4 of FIF of DCS signal)
1, 42, 43 are set to 0, 1, 0, 0), and are designated to the reading circuit 2 by the signal line 24a.

In the fine mode, the DCS signal designates reading in the fine mode in S90 (D
The bit 15, 41, 42, 43 of the FIF of the CS signal is set to 1, 0, 0, 0), and the reading circuit 2 is designated by the signal line 24a.

Further, in the standard mode, the reading in the standard mode is designated by the DCS signal in S92 (all the bits 15, 41, 42 and 43 of the FIF of the DCS signal are set to 0), and the reading circuit is operated by the signal line 24a. Specify 2

Thereafter, in S94, the process proceeds to S58.

Further, in S96, the information of the signal line 10a is inputted and the selected line density on the transmitting side is judged. If it is the ultra fine or semi-ultra fine mode, the process proceeds to S86, and if it is the super fine mode, the process proceeds to S88. If it is the fine mode, the process proceeds to S90, and if it is the standard mode, the process proceeds to S92.

Further, in S98, the information of the signal line 10a is inputted, the selected line density on the transmitting side is judged, and if it is the ultra-fine, semi-ultra-fine or super-fine mode, the process proceeds to S88 and if it is the fine mode. S90
If it is the standard mode, the process proceeds to S92.

[0075]

As described above, according to the first to third inventions of the present application, it is possible to support A3 with a fixed memory size, and A4 which is frequently used can also output high quality images. Thus, it becomes possible to realize an inexpensive A3 compatible facsimile.

Further, according to the fourth to sixth inventions of the present application, the processing corresponding to A3 can be performed at a predetermined decoding speed, and the more frequently used A4 can perform constant real-time decoding, which is inexpensive. A3 compatible facsimile can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing receivable recording paper sizes and linear densities corresponding to usable memory capacities.

FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the first embodiment.

FIG. 5 is an explanatory diagram showing receivable linear densities in the main scanning direction corresponding to recording paper sizes.

FIG. 6 is a flowchart showing the operation of the third embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the third embodiment.

[Explanation of symbols]

 2 ... Reading circuit, 4 ... Recording circuit, 6 ... Encoding / decoding circuit, 8 ... Original size detecting circuit, 10 ... Transmission linear density selecting circuit, 12 ... Recording paper size detecting circuit, 14, 16 ... Linear density setting circuit , 18 ... Memory circuit, 20 ... Modulator / demodulator, 22 ... NCU, 24 ... Control circuit.

Claims (6)

[Claims] 1. A facsimile apparatus comprising means for notifying a transmitter of a receivable linear density corresponding to a recording paper size from a receiver. 2. The facsimile apparatus according to claim 1, wherein the receivable linear density is determined by the information amount of one page. 3. The facsimile apparatus according to claim 1, wherein the transmitter determines the transmission line density based on the information notified from the receiver and the transmission size. 4. A facsimile apparatus comprising means for informing a transmitter of a receivable linear density in the main scanning direction corresponding to a receivable main scanning direction length. 5. The facsimile apparatus according to claim 4, wherein the receivable linear density in the main scanning direction is determined from the decodable information amount of one line within a recording period of one line. 6. The transmitter according to claim 4, wherein the transmitter determines the linear density in the main scanning direction based on the information notified from the receiver and the length in the main scanning direction at the time of transmission. Facsimile machine.