JPH06326870A - Picture communication equipment - Google Patents

Abstract

PURPOSE:To improve the data processing efficiency by relieving the processing load of a facsimile control unit side receiving demodulation data from a MO DEM unit to process the data. CONSTITUTION:A dual port RAM 16 is interposed between a MODEM unit 1 executing modulation/demodulation processing of picture data and a facsimile control unit 2 executing processing such as data magnification to execute data write/read from the MODEM unit 1 and data write/-read from the facsimile control unit 2 simultaneously. Thus, the processing executed to receive demodulation data for the facsimile control unit 2 is considerably reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image communication apparatus in which a modem side and a facsimile control side are unitized.

[0002]

2. Description of the Related Art A conventional device of this type, as shown in FIG. 7, is a modem unit 1 for performing modulation / demodulation processing of image data.
And a facsimile control unit 2 for performing processing such as data expansion and recording. When receiving image data, the image data demodulated by the modem unit 1 side is transferred to the facsimile control unit 2 side for expansion and recording paper. And so on.

The modem unit 1 includes a line control unit 11 for controlling the line L, an analog FEP (FEP: front end processor) 12, and a DSP core (digital signal processing unit) 13 for digitally performing processing such as modulation / demodulation. ,
The facsimile control unit 1 includes a transmission register 14 and a reception register 15 for passing image data, and writes the demodulated data in the reception register 15 each time the reception signal from the line L is demodulated by 1 byte. In response, an interrupt request (INT) is issued.

The facsimile control unit 2 concentrates the operation of the image reading / recording unit 21, the image data compression / expansion unit 22, the console 23 such as an operation panel, the working RAM 24 for temporarily storing image data, and the operation of the entire apparatus. Each time there is an interrupt request INT from the modem unit 1 side, a CPU (central processing unit) 25 etc. for controlling the demodulation data is sent from the reception register 15 on the modem unit 1 side to 1 by the processing based on the interrupt request. The data is read byte by byte, and the data is temporarily stored in the working RAM 24 and then expanded or the like.

[0005]

However, according to such a configuration, the processing load on the side of the facsimile control unit that receives and processes the demodulated data from the modem unit is large, and the processing efficiency on the side of the facsimile control unit decreases. There was a problem.

The above-mentioned problems occur for the following reasons. That is, in the case of the conventional device described above, as shown in FIG. 8, the modem unit 1 issues an interrupt request to the facsimile control unit 2 every time one byte of image data is demodulated. Each time there is an interrupt request, the facsimile control unit 2 performs a predetermined interrupt preparation process and then reads the image data from the reception register 15 on the modem unit 1 side.

Therefore, the interrupt request to the facsimile control unit 1 is frequently issued, and the frequent interrupt request causes the facsimile control unit 2 to spend a lot of time in the preparation process for the interrupt. For example, the time margin for performing other processes such as data expansion and recording is reduced.

The present invention has been made in view of the above problems, and an image capable of improving the data processing efficiency by reducing the processing load on the side of the facsimile control unit that receives and processes demodulated data from the modem unit. An object is to provide a communication device.

[0009]

In order to solve the above problems, the present invention has a dual port RAM interposed between a modem unit for performing modulation / demodulation processing of image data and a facsimile control unit for performing processing such as data expansion. In addition, the writing / reading of data from the modem unit side and the reading / writing of data from the facsimile control unit side are simultaneously performed.

[0010]

According to the present invention, with the above-described structure, the processing performed by the facsimile control unit for receiving the demodulated data can be greatly reduced, and the facsimile control unit side can perform other operations such as data expansion. Since it is possible to secure a large time margin for performing the processing of (1), it is possible to reduce the processing load on the facsimile control unit side and improve the data processing efficiency.

[0011]

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

In the figures, the same reference numerals indicate the same or corresponding parts. FIG. 1 shows a schematic configuration of an image communication device according to a first embodiment of the present invention.
First, 1 is a modem unit for performing modulation / demodulation processing of image data, and 2 is a facsimile control unit 2 for performing processing such as data expansion and recording.

The modem unit 1 includes a line control unit 11 for controlling the line L, an analog FEP (FEP: front end processor) 12, and a DSP core (digital signal processing unit) for digitally performing processing such as modulation / demodulation. 1
A dual port RAM 16 having three or two write / read access ports is provided.

The facsimile control unit 2 concentrates the operation of the image reading / recording section 21, the image data compression / expansion section 22, the console 23 such as an operation panel, the working RAM 24 for temporarily storing the image data, and the entire apparatus. A CPU (Central Processing Unit) 25 and the like for dynamically controlling are provided.

The dual port RAM 16 is interposed between the modem unit 1 and the facsimile control unit 2, one access port is connected to the bus B1 in the modem unit 1, and the other access port is the facsimile control unit. Connected to bus B2 in 2
The writing / reading of data from the modem unit 1 side and the reading / writing of data from the facsimile control unit 2 side are performed simultaneously.

In this case, the dual port RAM 16
The storage area is divided into a plurality of banks, and the writing state of data to each storage bank is displayed by the flag of the status register in the RAM 16. That is, the status register in the RAM 16 has a first flag (FULL) indicating, for each storage bank, whether or not writing of data to the bank has been completed.
And a second flag (bank end) indicating whether or not the bank capacity is filled with the written data.
Have.

Therefore, by checking the contents of the status register, it is possible to individually determine the write state of data to each bank. For example, when both the first flag and the second flag are set to "1", the writing of the data to the bank corresponding to the flag is completed and the capacity of the bank is the write data. Means that it is full of.
If "1" is set in only the first flag and the state of the second flag is "0", the capacity of the bank corresponding to the flag remains, but the data writing to that bank Including means that it is finished. The flag check of the status register can be performed from either side of the two ports.

The operation of the image communication apparatus configured as described above will be described below. FIG. 2 shows a procedure of delivering demodulated data from the modem unit 1 to the facsimile control unit 2 in the apparatus shown in FIG.

1 and 2, each time the modem unit 1 demodulates the received image data by 1 byte,
The byte demodulated data is written to the dual port RAM 16. This writing is performed by accessing one port of the dual port RAM 16.

On the other hand, the facsimile control unit 2 periodically checks the flag of the status register of the dual port RAM 16. Then, if the flag-checked storage bank is detected, all the demodulated data written in the storage bank are collectively read and transferred to the working RAM 24.

As a result, the facsimile control unit 2
Allows the data demodulated by the modem unit 1 to be collected in blocks of a plurality of bytes in a short time without receiving frequent interrupt requests, which reduces the frequency of interrupt occurrence. , It becomes possible to secure sufficient time for performing other processing such as data expansion.

In this case, the transfer of the demodulated data from the modem unit 1 to the facsimile control unit 2 can be performed in either bank or frame units.

That is, when data is transferred in units of banks, the modem unit 1 writes data to each storage bank until the bank capacity becomes full, while the facsimile control unit 2 causes the bank to be transferred. A first flag (FULL) indicating whether or not the writing of data into the memory has been completed, and a second flag (bank end) indicating whether or not the capacity of the bank is filled with the written data. The banks having both become "1" are searched and read. As a result, the demodulated data is collected in bank units and block-transferred to the facsimile control unit 1 side.

When data is transferred in units of frames, the writing of data from the modem unit 1 to each storage bank is ended at the end of each frame, while the facsimile control unit 2 sends the data to the bank. The bank in which the first flag (FULL) indicating whether or not the writing is completed is set to "1" is searched for and the bank is read. As a result, the demodulated data is collected in frame units and block-transferred to the facsimile control unit 1 side.

FIG. 3 shows a second embodiment of the present invention. The difference from the above-mentioned embodiment will be described. In the second embodiment, the dual port RAM 16 is shown.
An interrupt control unit 17 is provided which issues an interrupt request to the facsimile control unit 2 side in accordance with the state of writing data into the.

The interrupt control unit 17 has a bank register 1 in which a write state of data in each storage bank is registered as a flag.
71, it detects the presence / absence of data writing in each storage bank from the registered contents of the bank register 171, and issues an interrupt request to the facsimile control unit 2 side based on this detection.

Upon receiving the interrupt request, the facsimile control unit 1 performs a predetermined interrupt preparation process, and then the bank register 171 and the dual port RAM 1
Referring to the status of 6, the data of the storage bank for which the data writing is completed is read all at once.

As a result, the facsimile control unit 2
As shown in FIG. 4, executes the processing for the interrupt request only when the data writing to one storage bank in the dual port RAM 16 is completed, and otherwise executes other processing such as expansion. can do.

Therefore, also in the case of the second embodiment,
The facsimile control unit 1 can secure a sufficient time for performing other processing such as data expansion.

FIG. 5 shows a third embodiment of the present invention. Explaining the differences from the above-mentioned embodiment, in the third embodiment, the dual port RAM 16 will be described.
A pointer register 18 is provided in which the address information of the data written in is registered. The address information includes address information indicating the start and end of data.

The facsimile control unit 2 refers to the pointer register 18 and reads the block data delimited by the address information registered therein.

In this case, the data demodulated in 1-byte units by the modem unit 1 is divided into frames or arbitrary units other than frames as shown in FIG. It can be transferred to the control unit 2 side.

Although the embodiments of the present invention have been described above, the present invention can have various modes other than the above embodiments. For example, the dual port RAM 16 is used not only for transfer of demodulated data from the modem unit 1 side to the facsimile control unit 2 side during reception, but also for transfer of transmission data from the facsimile control unit 2 side to the modem unit 1 side during transmission. Can be used.

The dual port RAM 16 may be provided in the facsimile control unit 2.

[0035]

As is apparent from the above description, according to the present invention, a dual port RAM is interposed between a modem unit for performing modulation / demodulation processing of image data and a facsimile control unit for performing processing such as data expansion. By simultaneously writing / reading data from the modem unit side and reading / writing data from the facsimile control unit side, the processing performed by the facsimile control unit for receiving demodulated data is significantly reduced. This allows the facsimile control unit side to have a lot of time to perform other processing such as data decompression, reducing the processing load on the facsimile control unit side and improving the data processing efficiency. It has the effect of being able to improve.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image communication device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a delivery processing state of demodulated data by the device shown in FIG.

FIG. 3 is a schematic configuration diagram of an image communication device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a delivery processing state of demodulated data by the apparatus shown in FIG.

FIG. 5 is a schematic configuration diagram of an image communication device according to a third embodiment of the present invention.

6 is a diagram showing a delivery processing state of demodulated data by the device shown in FIG.

FIG. 7 is a schematic configuration diagram of a conventional image communication device.

8 is a diagram showing a delivery processing state of demodulated data by the conventional device shown in FIG.

[Explanation of symbols]

1 Modem Unit L Line 11 Line Control Unit 12 Analog FEP (FEP: Front End Processor) 13 DSP Core (Digital Signal Processing Unit) 16 Dual Port RAM 17 Interruption Control Unit 171 Bank Register 18 Pointer Register B1 Modem Unit 1 Side Bus 2 Fax control unit 21 Image reading / recording unit 22 Image data compression / expansion unit 23 Console such as operation panel 24 Working RAM 25 CPU (Central Processing Unit) B2 Bus on the side of facsimile control unit 2

Claims (3)

[Claims] 1. A modem unit for performing modulation / demodulation processing of image data, a facsimile control unit for performing processing such as data expansion, and two ports for simultaneous write / read access from the modem unit side and the facsimile control unit side. An image communication apparatus equipped with a dual port RAM having the following. 2. A modem unit for performing modulation / demodulation processing of image data, a facsimile control unit for performing processing such as data decompression, and two ports for simultaneous write / read access from the modem unit side and the facsimile control unit side. An image communication apparatus comprising: a dual-port RAM having: and an interrupt control means for issuing an interrupt request to the facsimile control unit side in accordance with a state of writing data to the dual-port RAM. 3. A modem unit for performing modulation / demodulation processing of image data, a facsimile control unit for performing processing such as data decompression, and two ports for simultaneous write / read access from the modem unit side and the facsimile control unit side. An image communication apparatus including: a dual port RAM having: and a pointer register in which address information of data written in the dual port RAM is registered.