JPH0340558A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To inexpensively shorten a transmission speed by executing 0 fill processing in accordance with the 1-line MSLT of a terminating equipment. CONSTITUTION:At the time of storing coded image information in a buffer memory 21, a shaped line end signal is written in each byte as an end-of-line signal(EOL signal) to be written in the end of image information of one line. Since a zero-fill(0 fill) is added to the end of the shaped EOL signal in accordance with the MSLT (minimum transmission rate) of the terminating equipment at the time of transferring data from the memory 2 to a MODEM 16, data transmission matched with the MSLT of the terminating equipment can be attained. Consequently, the need for a highly developed processing means can be eliminated and the transmission speed can inexpensively be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile device with improved transmission speed.

[Background of the invention] Various 81 functions are added to facsimile machines.

Broadcast communication is one of the additional functions.

When performing broadcast communication, the image information to be stored is stored in a buffer memory provided inside the device, including the encoding method, resolution, and minimum transmission speed of one line (MSLT).
), etc., and the encoded image information is stored.

Therefore, in order to perform broadcast communication to other machines with different encoding methods, resolutions, M, SLT, etc., the image information stored in the buffer memory is decoded using the -th machine's method, and then sent to the other party again. Processing such as encoding is performed to match the system of the machine.

In addition, in low-grade machines, the encoding method, solution (1 degree, M, SL
T, etc. are the minimum capabilities of the G3 standard (M, H encoding system,
Resolution of 3.85 lines/ll1m, M of 20 m5ec
S L T ). Then, a method is adopted in which the information is sent as is to the other party's device.

[Problem to be Solved by the Invention 1] As mentioned above, when performing processing such as decoding image information stored in a buffer memory using the method of a -degree machine and re-encoding it according to the method of the other machine. Since encoding and decoding processes need to be processed almost simultaneously in parallel, high-speed and expensive encoders and decoders are required, which increases costs.

In addition, when using a method such as a low-end machine that encodes image information at the minimum capacity of the 03 standard and transmits it as is to the other machine, it is always possible to use one line even for the other machine with a high-capacity MSLT. Since zero-fill (0-fill) is added and transmitted so that the MS LT is 20 m5ec, there is a drawback that the transmission speed decreases.

Therefore, the present invention solves these conventional problems and proposes a facsimile device that is low cost and has improved transmission speed.

[Means for Solving the Problem] In order to solve the above-mentioned problem, in the present invention, when storing encoded image information in a buffer memory,
As a line end signal written at the end of the line image information, there is a means to write a formatted line end (= sign) in 1-byte units, and when transferring data from the buffer memory to the modem, it is necessary to It is particularly desirable to have means for adding an O-fill after the shaped line end signal in accordance with the transmission speed.

[Function] When storing encoded image information in the buffer memory 21, a formatted line end signal is written in 1-byte units as a line end signal (EOL signal) written at the end of one line of image information. written.

In other words, as shown in Figure 2, ○ bits are added so that the last image information is 1 byte, and then the EOL signal is 2 bytes (0080) 1) (H
(in hexadecimal notation) is added.

When transferring data from the buffer memory 21 to the modem 16, an O fill is added after the EOL signal that has been shaped in accordance with the MSLT (minimum transmission speed) of the other party.

This enables data transmission to the other party's MSLT.

In this way, even if the MSLT values of your machine and the other machine differ,
Encoding and decoding processing is no longer required each time, so
High-speed processing means are not required.

Then, when transferring data to the modem 16, the reception +=
Since the 0-fill is performed in accordance with the MSLT of the other device, the O-fill is added only when the processing speed of the other device is slower than the own device, so the transmission time is shortened in other cases.

[Embodiment] Next, an example of a facsimile machine according to the present invention will be described in detail with reference to FIG. 1 and subsequent figures.

FIG. 1 shows an example of communication control means 10 in a facsimile machine, and 11 is a CPU that manages communication control. 12 is a ROM in which various control programs are stored;
A RAM 13 stores incoming image signals, image signals to be transmitted, and the like.

The image signal read by the image reading unit 14 is stored in the RAM 13 or directly transmitted to the interface 15.
to the modem and network control circuit (NCU) 16. Further, the image signal inputted from the line is temporarily stored in the RAM 13 via the modem and the NCU 16.

Then, picture No. 18 read out from the RAM 13 is supplied to the recording section 18 via the interface 17 and is recorded.

It is also possible to directly record the incoming image signal without storing it in the RAM 13.

The telephone number of the destination party is supplied to the display unit 20 via the interface 19, so that it can be displayed.

Reference numeral 21 denotes a buffer memory, and when the memory transmission method is selected, such as broadcast communication, image information read from this buffer memory 21 is transferred to the modem 16 at the time of data transmission. Buffer memory 21
It is also possible to omit it and use the RAM 13 instead.

FIG. 2 is an explanatory diagram of image processing when the memory transmission method is selected.

First, encoded image information (picture code) as shown in A in the same figure.
is stored in the buffer memory 21 in units of 1 byte. In this case, if the last picture code of one line is less than 1 byte, bits "O" are allocated for the less than 1 byte, and the data is transferred to the buffer memory 21 in the state shown in FIG.

Next, EOL written at the end of one line of image information
As a signal, a shaped end-of-line signal (E OL (
:! No.) is used. In other words, as shown in Figure C,
In hexadecimal display (H), 2-byte data of (0080)H is used as a shaped EOL signal. Then, 2 bytes are written into the buffer memory 21 in units of 1 byte. Thereafter, similar encoding processing is performed for each line.

FIG. 3 is a software explanation of the process shown in FIG. 2. In this encoding processing routine 30, the premise is that the MSLT of the other machine is checked in phase B mode, and the data is sent to the MSLT counter. Stored in.

When the encoding process is started, the contents of the MSLT counter are first transferred to the line byte counter (LBC) (step 31). This LBC is a counter required during memory transmission processing.

Next, the image information of the original is read and written to the encoding buffer, and it is checked whether one line of image information to be processed has been completed (steps 32 to 34).

When the encoding process is completed for one line of image information, if the last encoded image information is less than 1 byte, a bit "O" is added to form 1 byte ( Step 35).

After that, 2 bytes of formatted EOL (: No. 4 (○o8
0)]1 are added, and these are also added to the buffer memory 2.
1 (steps 36.37).

Such processing is executed on a line-by-line basis (step 38).

The reason why bit rQ is added to the last image information to form 1 byte of encoded data is to facilitate detection when transmitting the shaped EOL signal that is added subsequently. be.

FIG. 4 shows an example of the processing routine 4° at the time of memory transmission. This process ends until the encoded image information (picture code) is transferred from the buffer memory 21 to the modem 16.

Counter content C is a counter used when adjusting MSLT4, and is a counter used when adjusting MSLT4.
) is different from the other machine's MSLT-3 (14sLT-R), especially when the own MSLT-3 is faster than the other machine's MSLT-3, it is used for O-fill processing to fill in the time difference. .

The value of the 6M SLT counter, which is determined by the communication speed determined at the start of communication with the MSLT-R of the other party, is substituted into the LBC as an initial value before sending each line data after the communication speed is determined.

One byte of the encoded image information is read out and transferred to the modem 16, and the one line byte counter LBC is decremented each time this transfer is made (step 41.42).
.

Next, 1 byte of image information I! is sent to the modem 16! It is determined whether (transmission data) is (00)H,
If not, it is determined whether it is (80)H, and if not, the flag for (○○)11, which will be described later, is turned off (reset) (step 43.44.4
8) When the data is neither (00)H nor (80)H, the data can be determined to be image information, so image information continues to be transferred.

However, the 1 byte of image information sent is (OO)It
If so, consider this image information as a shaping EOL signal, and first set that flag (turn it on).
, wait for the next byte transmission interrupt (step 43.49)
.

Then, when the next image information sent (S) is not (○o))1 but (80))I, the state of the flag can be determined, and when the flag is set (step 45)
, for the first time, these 2 bytes of data are formatted E O
The count value of counter LBC is checked (step 46).

If this count value is smaller than O, it means that the transmission speed of the other device is faster (Fig. 6A). It is sufficient to set the other side to a standby state.

When such a transmission rate relationship exists, the contents of the counter LBC are reset to the contents of the MSLT counter, and the flag is turned off (steps 46 to 48).

On the other hand, when the count value LBC of the own machine is larger than O, it means that the transmission speed of the own machine is faster than that of the other machine (Fig. 6B). In this case, the value of the counter LBC is O. 0 fill processing is executed in which data of bit "O" is continuously sent in units of 1 byte until 0 is reached (step 50).

FIG. 5 shows an example of a processing routine 60 for this O-fill processing, which has a subroutine configuration.

When this processing routine 60 is called, data for 0 fill, that is, bit "0" data, is sent to the other device in 1-byte units, and the 1-line byte counter LBC is decremented each time (step 61. 62
).

This data transmission is performed by the 1 line byte counter LB of own machine.
This continues until the value of C becomes O, and when they match, the initial value is assigned to this counter LBC for the next line, and this subroutine processing ends (step 6
3.64).

In this way, if you execute the 0-fill process when sending the image information data to the other device, the O-fill process will be performed only when the transmission speed of the own device is faster than the other device's transmission speed. , wasteful O-fill processing is no longer performed.

[Effects of the Invention] As explained above, in the present invention, when storing encoded image information in a buffer memory, a formatted line end number 48 is written at the end of one line of image information. The line end signal is written in 1-byte units, and when data is transferred from the buffer memory to the modem, an O-fill is added after the formatted line end signal in accordance with the minimum transmission speed of the other device. It is something.

According to this, the detection of the shaping line end signal becomes extremely easy.

Incidentally, conventionally, it is necessary to detect a line end signal by combining bit shift processing, bit mask processing, conveyor processing, etc., which is extremely troublesome in terms of both hardware and software. In this invention, it is easy to understand that software processing is extremely simple because it is enough to check each byte.

In addition, in this invention, O-fill processing is performed according to the minimum transmission speed of one line of the other device, so even when the minimum transmission speed of the other device is high, the own device is adjusted to the minimum transmission speed of the other device to meet the 03 standard. Since the transmission speed is not adjusted, the transmission speed will not be delayed unnecessarily. Therefore, it is possible to easily reduce the transmission time.

From the above, the present invention is suitable for application to a memory transmission method (broadcast communication) using low-grade equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of communication control means in a facsimile apparatus according to the present invention, FIG. 2 is an explanatory diagram of data processing operation, FIGS. 3 to 5 are flow charts showing an example of data processing, and FIG. The figure is an explanatory diagram of transmission speed. 10...Communication control means 11...CPU 14...Image reading unit 16◆・◆Modem 18...Recording unit 21...Buffer memory

Claims (1)

[Claims] (1) When storing encoded image information in a buffer memory, means for writing a formatted line end signal in 1-byte units as a line end signal written at the end of one line of image information, and the buffer A facsimile machine characterized by having means for adding a 0-fill after the formatted line end signal in accordance with the minimum transmission speed of one line of the other party's machine when transferring data from the memory to the modem. Device.