JPH07264373A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To transmit a huge data amount without any communication trouble and to transmit data read in a standard mode at a high speed by deciding the transmission time of data transmission and reception in an original read mode. CONSTITUTION:When transmission start is instructed by using the key of an operation part 6 after setting a transmission original to a read part 4, a control part 1 controls the read part 4 corresponding to a specified read mode and stores picture data in a memory 12. When the read and storage of the entire original are completed, the control part 1 controls a dialler 9 and an NCU 11 and performs dial call origination. When a line is connected with a called party, the control part 1 transmits CNG signals. In response to the CNG signals, the return of CED signals, DIS signals, NSF signals indicating an original mode function or the like and CSI signals indicating a telephone number on a reception side from the called party is waited for. Then, when the signals are received, the control part 1 decides a transmission system such as a MODEM speed and minimum transmission time, etc., based on the reception ability of a called party facsimile or the like in the DIS signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus capable of transmission between memories.

[0002]

2. Description of the Related Art Standards for high-speed digital facsimile machines are defined by CCITT (International Telegraph and Telephone Consultative Committee) T4 recommendation. Facsimile machines based on this T4 recommendation are classified into Group 3 (G3).
According to T4 recommendation, if the modulation speed of the modem is set to the highest speed in the standard and encoding methods such as Modified Read (MR) or Modified Huffman (MH) are used, theoretically high-speed image transmission is possible. Is.

However, in reality, the transmission time cannot be set to 0 due to the influence of the operating speed of the recording unit on the receiver side. Therefore, the standard of the minimum transmission time is also defined in the T4 recommendation.

In order to reduce the minimum transmission time to 0, it is conceivable to provide an image memory serving as a buffer in each of the transmitting and receiving facsimile machines and perform transmission between the memories (for example, Japanese Patent Laid-Open No. 63-142768). (See the official gazette). However, the capacity of the memory described above is naturally limited, and transmission of data that exceeds this limit (hereinafter referred to as memory flow) results in defective transmission.

Generally, as the image memory on the receiving side, 10 pages or more in terms of A4 originals are normally prepared, so that the data in the standard mode can be received in the memory for 10 pages, but the data in the halftone mode is standard. Since the amount of data is several times as large as that of the mode data, there is an increased risk of transmission failure due to the memory flow.

As a countermeasure against transmission failure due to this memory flow, Japanese Laid-Open Patent Publication No. 59-99873 discloses that the receiving side sequentially stores the received data in an image memory and simultaneously prints the data stored in this memory in a recording section. On the other hand, on the other hand, on the transmission side, the data transmission rate between the transmitter and the receiver at that time is set to the minimum bit number M of the image data of one line
L and the time T _L required for the recording unit to print one line of data are estimated in advance, and the free state of the image memory on the receiving side is determined based on this estimation to generate a memory flow. In that case, a configuration is disclosed in which a fill bit is inserted for each line to prevent a memory flow and to make the transmission time close to zero. If this method is adopted, it is possible to prevent the occurrence of transmission failure due to the increase in the amount of received data.

[0007]

However, Japanese Patent Laid-Open No. 59-9.
In the method of Japanese Patent Publication No. 9873, when the data amount is several times as large as the standard data as in the halftone mode, the number of lines to which fill bits need to be added increases. In addition, since there is a buffer called a memory between the data transmission paths, the overall processing speed may be reduced. Further, in such a method, the transmission time is determined regardless of the data amount, so that 0 mse
c transmission is not possible, and the characteristics of inter-memory transmission cannot be fully utilized.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is characterized by an input unit capable of instructing selection of one of a plurality of document reading modes, and selection from the input unit. Means for optically reading the transmitted original according to the designated original reading mode, means for storing the original data read by the reading means, settable reception mode data sent from the receiver at the other end, and the input means. Means for determining the transmission time of the data in the storage means to the other party according to the original reading mode selected by the selection, and setting the other party receiver to the reception mode corresponding to the transmission time determined by the determining means. And a means for sending an instruction signal.

A further feature is that the determining means determines the transmission time other than 0 msec when the original reading mode selected and instructed by the input means is the halftone mode.

[0010]

According to this structure, the transmission time of data transmission / reception is determined by the document reading mode.

[0011]

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

The control unit (1) is composed of, for example, a microcomputer, and is composed of a semiconductor read-on memory and is an RO
It controls the respective parts connected via the bus (3) based on the control program stored in M (2).

The reading unit (4) is provided with a known optical reading means such as a CCD and a contact sensor and a means for converting an analog signal output from this means into a digital signal, and optically reads data on a document to be transmitted. And outputs as a digital signal. The recording unit (5) is provided with a known heat-sensitive type, thermal transfer type, inkjet type or electrophotographic type printing means, and performs printing under the control of the control unit (1).

The operation unit (6) includes a ten-key for inputting a telephone number and the like, as well as a mode instruction key for instructing selection of an original reading mode (standard mode, halftone mode) in the reading unit (4). Has function keys. The display unit (7) is composed of, for example, a liquid crystal display, and displays the contents of operation on the operation unit (6). The RAM (8) is a semiconductor random access memory and serves as a work memory for the control unit (1). The dialer (9) makes a dial call under the control of the control unit (1). Modem (1
Under the control of the control unit (1), 0) modulates the signal sent to the telephone line and demodulates the signal sent via the telephone line. The NCU (11) selectively connects the telephone line to the dialer (9) or the modem (10) under the control of the control unit (1) and detects an incoming call from the telephone line.

The image memory (12) comprises a semiconductor random access memory which can be accessed at high speed, and stores image data transmitted and received via a telephone line.

Next, to explain the operation of this embodiment,
First, after the transmission original is set in the reading unit (4), the telephone number of the transmission destination, the original reading mode and the transmission start instruction are given using the keys on the operation unit (6). The reading unit (7) is controlled to read the transmission original according to the designated reading mode, and the digital signal (image data) output from the reading unit (7) is stored in the image memory (12).

When the reading of all the transmission originals and the storage of the image data in the image memory (12) are completed, the control unit (1) controls the dialer (9) and the NCU (11),
Dialing is performed based on the telephone number input from the operation unit (6).

When the line connection with the transmission destination can be established according to the dial transmission, the control unit (1) first sends a CNG signal indicating that the transmission side requests facsimile transmission by the modem (10) as shown in FIG. It transmits to the other party via NCU (11).

In response to the transmission of the CNG signal, the other party sends a CED signal indicating that the other party is a facsimile, a DIS signal indicating the facsimile receiving capability (modem speed, minimum transmission time, etc.), a unique mode function, etc. Indicating N
Wait for the return of the SF signal and the CSI signal indicating the telephone number of the receiving side. Upon receiving these signals, the control unit (1) determines the transmission method such as the modem speed and the minimum transmission time based on the receiving capability of the destination facsimile in the DIS signal.

Specifically, the modem speed determines the highest speed that both the transmitting and receiving sides can tolerate.
Also, the minimum transmission time is basically determined to be the minimum transmission time that is acceptable for both the transmitting and receiving sides, similar to the modem speed. However, if the original reading mode on the transmitting side is halftone, transmission between memories is performed. The minimum one is selected from the transmission times other than the certain 0 msec transmission. That is, the allowable transmission time on the transmitting side is 0 msec, 5 msec, and 10 mse.
There are three types, c, and 0 ms as the transmission time on the receiving side.
If there are three types of ec, 10 msec, and 15 msec, and if the data in the image memory (12) is read in the halftone mode, it is 0 mse which is the transmission between the memories.
10 mse that is acceptable for both sending and receiving sides other than c transmission
c is determined as the transmission time. When the above data is read in the standard mode, the transmission time is set to 0 msec.

The transmission method thus determined is DC
The S signal is sent to the other party. At this time, a TSI signal indicating the telephone number of the transmitting side, a training signal, and a TCF signal for performing training chock are also sent at the same time.

The receiving side receiving such a signal sets the receiving method based on the DCS signal, and when it is completed, returns a CFR signal indicating that reception can be started, and waits for the reception of image data.

Upon receiving the CFR signal, the control unit (1)
The image data in the image memory (12) according to the transmission method transmitted as the DCS signal, the modem (10) and the NCU.
Send via (11).

As described above, in the present embodiment, even when the memory transfer is possible, the memory transfer is not performed when the image data is read in the halftone mode.

[0025]

According to the present invention, transmission between memories (0 ms)
Even if the facsimile device is capable of performing ec transmission, when the image data to be transmitted is read in the halftone mode, the transmission method other than the inter-memory transmission is automatically determined in consideration of the data amount. Therefore, even a large amount of image data to be transmitted such as the halftone mode can be transmitted without communication trouble, and the image data read in the standard mode can be transmitted at high speed by 0 msec transmission.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram for explaining the operation of the present embodiment.

[Explanation of symbols]

 1 control unit 4 reading unit 6 operation unit 12 image memory

Claims (2)

[Claims] 1. An input unit capable of selecting and instructing one of a plurality of original reading modes, and a unit for optically reading a transmission original in accordance with an original reading mode selected and instructed by the input unit.
Means for storing the manuscript data read by the reading means, the settable reception mode data sent from the receiver at the other end, and the manuscript reading mode selected and instructed by the input means for storing the data in the storage means. It is characterized by further comprising means for deciding the transmission time to the other party and means for sending an instruction signal to set the other receiver to the reception mode corresponding to the transmission time decided by the deciding means. Facsimile machine. 2. The facsimile apparatus according to claim 1, wherein the determining means determines the transmission time other than 0 msec when the original reading mode selected and instructed by the input means is a halftone mode.