JPS61270975A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten a time required for a procedure of a communication and to improve an efficiency of picture communication by starting the communication previously at a low speed, when transmitting to a telephone number of the other party connected to a line constantly unsatisfactory between a transmitter and a receiver. CONSTITUTION:A telephone number inputted from the other station telephone number input section 2 is transmitted to a telephone exchange section 6 through a line control section 5 from an equipment control section 3. After calling from the exchange section to the other party station, the line is connected to the other party facsimile equipment. When receiving an initial identification signal from the other party equipment the presently transmitted telephone number by the equipment control section 3 is checked by an identification circuit 3-1 and the result is fed to transmission speed control circuit 302. If the first digit of the transmitted telephone number is '0', a picture signal transmission speed of a modulation and demodulation section 4 is set to 4800BPS, and if it is except for '0', setting to 9600BPS, a training check is carried out by testing. After a reception preparing recognition signal is received, the transmission of a picture signal is started.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to facsimile devices.

More details below [Prior Art] In conventional facsimile communication, two communications are possible by comparing the capabilities of the demodulator of the other party's facsimile machine, which is known from the initial identification signal, with the capability of the modulator of the own facsimile machine. A method is adopted in which communication is started at the highest image signal transmission speed.

A common example of this type of conventional facsimile machine is
The procedure for transmitting an image signal when a facsimile machine having a modulation/demodulation unit capable of transmitting an image signal up to 9600 BPS is connected to a line capable of communicating at 48008 PS or less will be explained with reference to FIG.

As shown in the figure, after receiving a call from the second calling party, the first calling party receives an initial identification signal sent from the called party.

The possible image signal transmission speed of mutual facsimile devices is 96
When you know that it is 00 BPS, first 9600BP
Attempt a training check with S. 9600BPS
The training check fails with an error, but
Since the cause of the failure may be due to burst noise, try again at the same transmission speed of 9600 BPS. As a result, they will also fail. So, after lowering the transmission speed one step and trying twice at 7200BPS,
Attempt a training check by reducing the speed to 4800 BPS. At this point, it is possible to proceed to transmitting the image signal only after the error is eliminated and the reception preparation confirmation signal is received.

In addition, in order to shorten the time required for such communication procedures, if there is a possibility of connecting to a line that is capable of communicating at 4800 BPS or less, the ability of the demodulator of the receiving facsimile machine is Even if the speed is up to 9600 BPS, there is a method of starting the training check at a fixed speed of 48008 PS. Of course, in this method, even though it is connected to a line in good condition at 9600 BPS, it takes a longer time to transmit the two-picture signal.

[Problem that the invention seeks to solve]

As is clear from the above-mentioned conventional technology, even with a high image signal transmission speed, even to a specific party whose line condition is not always good, communication is made at the highest image signal transmission speed determined by the facsimile machine's modem capacity. until there are no errors in the training check performed prior to 2-picture signal transmission.

If we adopt a method of gradually lowering the transmission speed, it will take a long time for two communication procedures, and if we set a fixed low transmission speed, even if the other station has a high transmission speed and a good line condition, the low transmission If a method of communicating at high speed was adopted, there was a drawback that two communication times would be longer.

[Failure to solve the problem]

The facsimile device according to the present invention has a means for inputting the telephone number of the other party, and the input telephone number is connected to a line that is not always suitable for the high-speed image signal transmission speed that can be communicated between the sending and receiving devices. means for identifying whether or not a specific telephone number belongs to a partner station known to be transmitted;
The present invention is characterized in that it includes means for controlling a modulation section so as to start communication at a predetermined low transmission rate upon receiving an identification that the telephone number is a specific telephone number from the identification means.

[Embodiments of the invention]

Next, a facsimile apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention. In this figure, 1 is a facsimile machine on the sending side, 2 is a telephone number input section of the other party, 3 is a device control section, 4 is a modulation/demodulation section, and 5 is a line control section.

6 is a telephone exchange connected to the facsimile machine 1. In mutual communication, a facsimile machine of the other party is connected to the telephone exchange 6.

Furthermore, in this example, the image signal transmission capacity of the modulation/demodulation section is 9600 BPS and 7200 BPS for both the transmitting and receiving stations.
, 4800 BPS and 2400 BPS. It is assumed that the sending facsimile 1 is connected via the exchange 6 to an external line when a call is made from a telephone number "0", and to an extension line when a call is made from a telephone number other than "0". In addition, in the case where it is known that the internal line is in a line state where communication is possible at a picture signal transmission rate of 9600 BPS, and the line state is in a state where communication is possible at an external line at a speed of 4800 BPS or less,
The communication procedure will be explained.

First, a telephone number input from the other party's telephone number input section 2 is transmitted from the device control section 3 to the telephone exchange 6 via the line control section 5. After the exchange 6 makes a call to the other party's office, the line is connected to the other party's facsimile machine. 2.When the calling party receives an initial identification signal from the other party's facsimile machine,
9600 as a facsimile machine for mutual communication
Although it is found that BPSO image signal transmission is possible, the device control section 3 checks the telephone number that has just been called using the identification circuit 3-1. The result is received by the transmission rate control circuit 3-2.2 If the first digit of the calling telephone number is "O".

The image signal transmission rate of the modulation/demodulation unit 4 is set to 4800 BPS, and if it is other than "'0", it is set to 9600 BPS and a training check is attempted. Then, after receiving the reception preparation confirmation signal, transmission of the image signal is started.

Figure 2 shows the communication procedure up to image signal transmission when the first digit of the telephone number is '0'. Since the first digit of the number is "0", a training check signal starting speed of 4,800 BPS, which is set in advance, is tried.

The above embodiment is based on CCITT Recommendation T3 Recommendation AA
Needless to say, it is also applicable to facsimile machines.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to identify the telephone number of the other party that is regularly connected to a line that is not in good condition with respect to the high image signal transmission speed that allows mutual communication between facsimile machines. However, when making a call to the other party's telephone number, by starting communication at a preset low transmission speed, the time required for the communication procedure can be shortened, improving the efficiency of image communication. The effect you can get is huge.

[Brief explanation of the drawing]

FIG. 1 is a Zoroku diagram showing the configuration of an embodiment according to the present invention;
FIG. 2 is a diagram for explaining the communication procedure of the embodiment shown in FIG. 1, and FIG. 3 is a diagram for explaining the communication procedure of the facsimile apparatus in the prior art. In the figure, 1 is a facsimile machine, 2 is a telephone number input section of the other party, 3 is a device control section, 4 is a modem section, 5 is a line control section, 6 is a telephone exchange, 3-1 is an identification circuit, and 3-2 is a Chilled by transmission speed control circuit. Calling party Called party Calling party Called party

Claims (1)

[Claims] 1. A means for inputting the telephone number of the other party, and it has been found that the input telephone number is regularly connected to a line that is not good for the high-speed image signal transmission speed that can be communicated between the transmitting and receiving devices. a means for identifying whether the telephone number belongs to a specific telephone number belonging to a partner station, and upon receiving an identification output from the identifying means indicating that the telephone number is a specific telephone number, communication is started at a predetermined low transmission speed; A facsimile apparatus comprising means for controlling a modulation section so as to perform the following steps.