JPH067624Y2 - Facsimile image information sending device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of communication control means installed in a facsimile image information broadcasting device, which prevents line disconnection by a terminal when delay in arrival of image information. It is intended.

[Prior Art] A general configuration example of a facsimile image information broadcasting apparatus will be described with reference to FIG. In FIG. 3, a facsimile image information broadcasting device (1) is connected to a public telephone line network (3) through a plurality of communication control means (hereinafter referred to as FCU) (2), and a large number of document images are displayed. Image database memory that stores and stores information
A service for simultaneously delivering the document image information (3) to a plurality of facsimile terminals (4) is realized.

Next, the operation will be described. Image database memory
In (4), the drawing information is accumulated and stored in units of thousands to tens of thousands when converted to an A4 original. This drawing information is DMA (5).
Read out by the FCU (2) and transferred at high speed to the FCU (2).
At this time, the amount of document information is about several hundred Kbytes per A4 original page, and the FCU is divided into units of several tens of Kbytes.
Sequentially sent to (2). As shown in Fig. 2, FCU (2)
Has a buffer memory (6) necessary and sufficient to store and store the document information divided into units of several 10 Kbytes, and the document information accumulated and stored in the buffer memory (6) is parallel. It is read by the mirial converter (7), the data amount is compressed and encoded by the encoder (8), and then converted to an analog signal by the modulator (9),
It is amplified to a predetermined level by the amplifier 10 and sent to the telephone line. The speed of data sent to the telephone line at this time is 9.6K to 2.4, assuming G3 facsimile.
Kbits / sec, while DMA (5) reads and transfers data at several Mbits / sec, so DMA (5) can be used for buffer memory (6) of one FCU (2).
After sending the document data in units of several 10K, the FC
While U (2) is sending data to the telephone line, DM
The A (5) can read the other drawing information from the database memory (4) and send the data to another FCU (2). Here, the CPU (11) constantly monitors the remaining amount of the memory of the buffer memory (6) of each FCU (2), and when the remaining amount is almost empty, the CPU (11) sends the next to the DMA (5). Instruct to transfer the data. In this way, the data transfer rate of the DMA (5) is one to two digits faster than the data transmission rate of the FCU (2) to the telephone line, so that it is possible to simultaneously send data to a plurality of facsimile terminals (4). A delivery service of document information can be realized.

[Problems to be solved by the invention]

Since the conventional device was configured as above, the FCU
In response to the data transfer request from (2), CPU (11), DMA
It is necessary to design in consideration of the responsiveness of data transfer in (5). That is, according to the protocol of the G3 facsimile, the image signal is transmitted from the FCU (2) after the call to the communication network and the confirmation of the call connection are performed before the image signal is transmitted, through the pre-image signal transmission procedure. It has become a thing. At this time, if the image signal cannot be transmitted within several tens of seconds after the establishment of the call connection,
On the facsimile terminal side, the call is disconnected due to time-out. In this case, it is necessary to incorporate a complicated processing sequence for recalling from the FCU (2) or to keep the number of lines per CPU (11) small in order to guarantee the time from call establishment to image signal transmission. .

The present invention has been made to solve the above-mentioned problems. The CPU has a wide responsiveness, the number of lines per CPU is increased without re-calling, and the cost per line is reduced. It is an object of the present invention to provide an inexpensive facsimile image information broadcasting device which is designed to be reduced.

[Means for solving problems]

The facsimile image information broadcasting apparatus according to the present invention is capable of sending a dummy white image signal by providing a monitoring timer and a white signal generator in its communication control means in order to prevent call disconnection due to time-out of the facsimile terminal. Is.

[Action]

The FCU according to the present invention is provided with a white image signal generator in addition to the original image signal transmission function, and when the original image signal does not arrive within a time determined by call establishment, the white image signal is converted into the original image signal. Instead of sending the call, the call disconnection due to the time-out of the facsimile terminal is prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a block diagram showing an example of the configuration of an FCU showing an embodiment of the present invention. In FIG. 1, the drawing information sent from the DMA (5) is the same as in the conventional embodiment. Parallel-serial converter (7), encoder (8), modulator (9), amplifier (1
It is sent to the telephone line via 0). When the FCU (11) makes a call to the communication network and establishes the call prior to the transmission of the image signal, the monitoring timer (13) is started.
It is assumed that the monitoring timer (13) is set to the time T ₁ until the facsimile terminal disconnects the call due to time-out, and if the first image signal reaches the buffer memory (6) before this time T ₁ elapses. , The monitoring timer (13) is canceled and the image signal is sent out by following the route described above, but the image signal is buffered even after the time T ₁ has elapsed.
When it does not reach (6), the white signal generator (12) is immediately activated, and the white image signal is sent out as a dummy signal through the encoder (8), modulator (9) and amplifier (10). . The transmission of the dummy signal is continued until the image signal reaches the buffer memory (6). By adding this dummy white signal,
A white margin is added to the beginning of the original image signal in the received image of the facsimile terminal, but there is no problem in practical use because the content of the original image signal is not disturbed. In this way
It is possible to increase the apparent line holding time T ₁ of the facsimile terminal.

[Effect of device]

As described above, according to the present invention, since the FCU is configured to be capable of transmitting the dummy white image signal, the CPU has a sufficient responsiveness to the data transfer request from the FCU.
The number of processing lines by the CPU per unit can be increased, the facsimile image information broadcasting device can be made inexpensive, and the white image signal is sent after waiting until the call is cut off. The length of the area where is recorded becomes shorter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a communication control means in a facsimile image information broadcasting apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional communication means, and FIG. 3 is a facsimile image information broadcasting apparatus. 3 is a block diagram showing an example of the system configuration of FIG. In the figure, (1) is a facsimile image information broadcasting device, (2) is an FCU, (3) is a public line network, (4) is a fax terminal, and (5) is D.
MA, (6) buffer memory, (7) parallel-serial converter, (8) encoder, (9) modulator, (10) amplifier,
(11) is a CPU, (12) is a white signal generator, and (13) is a monitoring timer. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. An image database memory for storing and storing image information, a direct memory access means for extracting image data and performing high-speed data transfer, and a plurality of communication control means for communicating with a facsimile terminal. Communication control means and central processing control means for controlling the direct memory access means, and the image information stored in the image data memory is stored in each of the plurality of communication control means by the direct memory access means. In the case of divided and sequentially sent at different timings, each of the above-mentioned communication control means is started when a call is established to the communication network prior to the transmission of the image signal, and the time until the facsimile terminal disconnects the call is set. Generated monitoring timer, buffer memory that stores image signals and white image signals Each has a white signal generator, and when the image signal reaches the buffer memory before the above time elapses, the monitoring timer is canceled and the image signal is sent out, and the image signal is output before the above time elapses. When the buffer memory has not been reached, the white signal generator is immediately activated when the time has elapsed, and the white image signal is sent as a dummy signal. The dummy signal is sent when the image signal reaches the buffer memory. Facsimile image information transmission device characterized by lasting up to.