JPS6047548A - Facsimile multiple address device - Google Patents

Abstract

PURPOSE:To realize a facsimile multiple address device superior in extendability by transferring directly the compressed data of image information stored previously in a storage part to a communication control part through a dedicated data transfer line, and transmitting it together with an added file bit for flow control. CONSTITUTION:The image information read out by an original readout part is transferred to a system control part 21 through a system bus 22, and the transferred image information is further transferred from the control part 21 to a band compression/expansion part 26 through the bus 22 to perform bank compression. The compressed data is transferred to the control part 21 through the bus 22, and transferred from the control part 21 to a storage part 27 through the bus 22 and stored. Then, the stored compressed data is transferred to the communication control part 30 through a data transfer line 32 and transmitted after the necessary file file bit for flow control is added by the flow control part 31 in the control part 30.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a facsimile communication device.

1. Configuration of Conventional Example and Its Problems FIG. 1 is a schematic lock diagram of a conventional facsimile distribution device. In this figure, 1 is a system control unit that controls each part of the apparatus, and 2 is a system bus that connects this system control unit and each part.

Reference numeral 3 denotes a document reading section that reads the transmitted document, 4 a recording section that prints image information, and 5 a mechanism control that controls mechanisms such as the document feeding mechanism of the document reading section 3 and the recording paper feeding mechanism 9 of the recording section 4. Department. The document reading section 3 and the recording section 4 are each connected to the system bus 2 via a mechanism control section 6. 6 is a band compression/expansion section. Reference numeral 7 denotes a storage unit, which is composed of a magnetic disk storage device 8 and an auxiliary storage control unit 9.

9 is a communication control unit.

Next, the operation will be explained. The image information of the document read by the document reading section 3 is transferred to the system control section 1 via the system bus 2, and from there is transferred via the system bus 2 to the band compression/expansion section 6 where it is subjected to band compression. Ru. Compressed data of image information is transferred from the band compression/expansion unit 6 to the system bus 2.
is transferred to the system control unit 1 via the system bus 2, and further transferred to the storage unit 7 via the system bus 2 and stored in the magnetic disk storage device 8.
is stored in

In this way, when a multi-page original is read and the compressed data of its image information is stored in the storage unit 7, the system control unit 1 attempts to start communication with the destination that has been input in advance. . First, control signals are exchanged with the other party via the communication control unit 9, and negotiation of minimum transmission time and modulation speed is performed.

When this negotiation is completed, the compressed image data is read from the storage section 7, transferred to the band compression/expansion section 6 via the system bus 2, and expanded into half-picture information.

This half-screen information is sent to the system control unit 1 via the system bus 2.
will be forwarded to. The system control unit 1 stores the half-screen information as 1
It is transferred to the band compression/expansion unit 6 via the system bus 2 along with the minimum number of bits of the line.

The band compression/expansion unit 6 converts the half-picture information into CCITT recommendation T.
Bandwidth compression is performed using the MR (ModifyCd Read) method of , 4, and CCITT Recommendation T, 30-1 is applied to the code string.
Fill pits for flow control will be added as necessary to meet the line minimum transmission time requirements.

FIG. 2 is an explanatory diagram of the fill pit. (a) in this figure
indicates data before adding fill pits, 11 is a line synchronization signal (EOL), and 12 is compressed data of one line of image information. If the total transmission time of this EOLll and compressed data 2 of image information is shorter than the minimum transmission time, the same figure (
As shown in b), fill pits 13 are added so that the transmission time is longer than the minimum transmission time. The number of bits S of this fill pit is expressed by a pattern, where A (milliseconds) is the minimum transmission time, B (bps) is the modulation speed of the line, and L is the total number of bits of compressed data and EOL of one line of image information. It will be done.

S = A x B /1ooo-L ------・-・
-=・(1) However, S>0 Returning to Figure 1, as mentioned above, fill pit 6 no',
The compressed data to which "" has been added as necessary is transferred to the system control section 1 via the system bus 2, and from there to the communication control section 9 via the system bus 2 for transmission.

A conventional facsimile transmission device, such as the one with ``dual series'', first expands the compressed data of image information stored in the storage section 7 in the band compression/expansion section 6, and then performs band compression and addition of fill pits for flow control. Therefore, when transmitting, a large load is placed on the system control section 1, system bus 2, and band compression/expansion section 6, resulting in a problem of very poor expandability. In addition, in order to be able to execute such processing while communicating, it is necessary to speed up the system control unit 1 and the band compression/expansion unit 6, which increases the cost of the device. - It is an object of the present invention to provide a facsimile broadcasting device which solves the problems of the prior art and is highly expandable without increasing the cost of the device.

Structure of the Invention Page 6 The present invention is characterized in that image information is band-compressed in advance into a code that can be transmitted as is and stored in a storage unit, and also dedicated data that is independent of the system bus is provided between the storage unit and the communication control unit. A transfer path is provided, and a flow control unit is provided in the communication control unit, and the compressed data of image information is directly transferred from the storage unit to the communication control unit through a dedicated data transfer path, and the flow control unit performs the necessary fill pits. The above object is attempted to be achieved by adding and transmitting the information.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a schematic block diagram of a facsimile communication device according to an embodiment of the present invention. In this figure, 21(d,
A system control section, 22fd system bus, 23 a document reading section, 24 a recording section, 25 a mechanism control section, and 26 a band compression/expansion section. These are equivalent to the corresponding parts in FIG. However, the band compression/expansion section 26 does not have a function of adding fill pits for flow control. 27 is a storage unit, a magnetic disk storage device 28 and an auxiliary storage control unit 2
Consists of 9. 3o is a communication control unit. 32 is storage unit 2
7 and the communication control unit 3o. The storage unit 27 is the same as the storage unit shown in FIG. 1, except that it can be accessed directly from the communication control unit 3° through the data transfer path 32. The communication control unit 3o is the same as the communication control unit shown in FIG. 1, except that it includes a flow control unit 31 and a function of directly importing data from the storage unit through the data transfer path 32.

Next, the operation will be explained. Image information read by the original reading unit 23 is transferred to the system control unit 21 via the system bus 22 as in the conventional case, and transferred from the system control unit 21 to the band compression/expansion unit 26 via the system bus 22.
Bandwidth compression is applied.

However, this band compression is performed by the MR method shown in CCITT Recommendation T.4. The compressed data of the band-compressed image information is sent to the system control unit 21 via the system bus 22 as in the conventional case, and from there the data is sent to the system control unit 21 via the system bus 22.
The data is transferred to the storage unit 27 and stored therein.

When the image information of the multiple sheets of original is read in this way and the compressed data thereof is stored in the storage section 2, the system control section attempts to start communication with the destination party that has been input in advance.

First, a negotiation similar to the conventional method is performed to learn the minimum transmission time of the other party and to determine the modulation rate of the line. Then, the system control section 21 sets the minimum transmission time and modulation speed to the communication control section 3o via the system bus 22, and then activates the communication control section 3o. The flow control unit 31 of the system control unit 30 calculates the minimum number of bits in one line and the clock period based on the minimum transmission time and modulation rate.

Further, the communication control unit 30 accesses the storage unit 27 via the data transfer path 32, sequentially reads compressed data of image information,
After adding necessary fill pits in the flow control unit 31, the data is transmitted to the destination facsimile machine.

FIG. 4 is a block diagram of the flow control section.

In this figure, 41 is a transfer data 9 from the storage unit 27,
・-- A terminal to which data is input, 42 a terminal to which data after flow control is output, 43 a shift register, 44
and 46 are AND gates), and 46 is an OR gate. 47
is an EOL detector, 48 is a flip-flop, and 49 is an up/down counter. 5o is an arithmetic circuit, 61
52 is a timing generator, and 52 is a control circuit. 53 is a clock output terminal.

Next, the operation will be explained. When the minimum transmission time and modulation rate are input from the system control unit 21 to the control circuit 52, this control circuit 62 determines the minimum number of bits per line (including EOL).
A pulse is outputted to the output 55 with the period of the clock being set and sent to the outputs 63 and 64, respectively. The timing generator '51 takes in the clock period indicated by the output 54 at the timing of the pulse of the output 55 and starts generating a clock pulse having that clock period.

This clock pulse is sent out at output 66.

The arithmetic circuit 60 outputs the output 5 at the timing of the pulse of the output 56.
The minimum number of bits indicated by 3 is internally inserted into 10 pages. The 7'J tube flop 48 is reset by the pulse at output 55, and its inverted output 58 is at 1117 lvl. Therefore, the clock pulse output from the timing generator 51 is supplied to the shift register 43 via the AND gate 45, and the data input from the terminal 41 is sequentially shifted to the right on the shift register. Furthermore, the data output from the shift register 43 is output to the terminal 42 through the AND gate 44.

When the up/down counter 49 receives the pulse from the output 56, it is reset once and then starts counting. At this time, since the output 58 of the flip-flop 48 is at the 1'' level, the up/down/counter 49 performs up counting.

The EOL detector 47 monitors the data shifted on the shift register 43, and when detecting the EOI and code, sets its output 69 to the 1" level. FIG. 5 shows the EOL detector 47.
FIG. This EOI.

The detector 47 outputs N of the upper 12 bits of the shift register 43 and the next bit inverted by the inverter 6o.
The configuration is such that OR is performed using a NOR gate 61.

Returning to FIG. 4, the explanation will be continued. When the output 59 of the EOL detector 47 reaches the "1n level," the arithmetic circuit 50 turns up/down.
The count value P appearing at the output 64 of the down counter 49
is taken in, and the value Q of the following equation is calculated.

Q=P+(Number of EOL bits) - Minimum number of bits...
(2) If Q is 0 or more, the arithmetic circuit 50 outputs a pulse to the output 62 and resets the up/down counter 49. In this case, since the state of flip-flop 48 does not change, clock pulses continue to be supplied to shift register 43 and the EOL code and subsequent data continue to be output to terminal 42 via AND gate 44. Bumps and fill pits are not added.

On the other hand, when Q is negative, the arithmetic circuit 5o outputs the value of P 67
and output a pulse to the output 63.

This pulse sets the flip-flop and its output 58 goes to the ``0'' level.Therefore, the clock pulse is suppressed by the AND gate 45 and is no longer supplied to the shift register.

Further, the output of the AND gate 44 becomes "○" level. In other words, the fill pit is output to the terminal 42.

The up/down counter 49 is a flip-flop 48
When the output 68 of the arithmetic circuit 50 changes from the "1n level" to the "○" level, the value Q of the output 57 of the arithmetic circuit 50 is preset and the clock pulse is counted down.In this way, Q bits worth of fill pits are sent out. When the count value of the up/down counter 49 becomes O, it sends a pulse to the output 65. This pulse resets the flip-flop 48, and its output 58 becomes 11 again.
It will be 17 rubles. Therefore, a second pulse is supplied from the AND gate 45 to the shift register 43, and the data output from the shift register 43 is
4 and is output to terminal 42. Arithmetic circuit 5
o is pulse 3 at output 65 of up/down counter 49
When - appears, it returns to the initial state.

As described above, data transfer from the storage section 27 and flow control therefor are executed by the storage section 27 and the communication control section 30 independently from other parts. Therefore,
The number of lines accommodated in the container can be increased simply by adding the flow control unit 31 and line control unit of the communication control unit 3o without particularly increasing the speed of the system control unit 21 and the band compression/expansion unit 26. This greatly improves performance and reduces the cost of expansion. Furthermore, since the load on the system control section 21 and the band compression/expansion section 26 is reduced, it is possible to lower their operating speeds, which also leads to a reduction in device costs.

Effects of the Invention As described above, the present invention provides a flow control section in the communication control section, and also provides a data transfer path independent of the system bus between the storage section and the communication control section, and stores data in advance in the storage section. The compressed data of the image information is directly transferred to the communication control unit via a dedicated data transfer path, and fill pits for flow control are added to the data for transmission, so it has excellent expandability. Moreover, it is possible to realize a facsimile distribution device that requires less cost for expansion.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional facsimile routing device, FIG. 2 is an explanatory diagram of its flow control, FIG. 3 is a block diagram of a facsimile routing device according to an embodiment of the present invention, and FIG. 4 is a flow control section diagram. The block diagram, FIG. 5, is a circuit diagram of the EOL detector. 21...System control unit, 22...
System bus, 23... Original reading section, 26...
... Bandwidth compression/expansion section, 27... Storage section,
30... Communication control unit, 31... Flow control unit, 32... Data transfer path, 43...
...Shift register, 47...EOL detector,
48...Flip-flop, 49...
Up/down counter, 5o... Arithmetic circuit,
51...timing generator, 52...
control circuit.

Claims (1)

[Scope of Claims] A document reading section, a band compression section, a storage section, a communication control section, and a system control section connected to each of the above sections via a system bus; A dedicated data transfer path and a flow control unit are provided between the storage unit and the image information read by the document reading unit, and the image information read by the document reading unit is transferred to the system control unit via the system bus, and the image information is transferred from the system control unit to the system control unit. The information is transferred to the band compression unit via the system bus to perform band compression, the compressed data obtained thereby is transferred to the system control unit via the system bus, and the compressed data is received from the system control unit. The compressed data stored in the storage unit is transferred to the storage unit via the system bus and stored therein, and the compressed data stored in the storage unit is transferred to the communication control unit via the data transfer path. A facsimile broadcasting device with a flow control fill pit added and two transmitting pens.