KR930002687B1 - Fax - Google Patents

Abstract

The parameters of a transmission attenuator, a reception attenuator and the number of allowable error lines are automatically set according to loop characteristics and loop distance. The method comprises the steps: (A) comparing preset reception level and detected reception level; (B) adjusting reception level when preset reception parameter is significantly different to current reception level; (C) increasing distance parameter when reception level adjusted in the step (C) is low; (D) increasing the number of allowable error line when optimal setting is not accomplished in the step (D) to prevent transmission or reception stop.

Description

Sending and Receiving in Fax

1 is a block diagram of an apparatus for explaining the operation of the present invention.

2 is a flow chart for explaining the operation of the present invention.

* Explanation of symbols for main parts of the drawings

1: track 2: track control unit

3: comparative amplifier 4: band pass filter (BPF)

5: Modulator demodulator (MODEM) 6: Decoder

7: ROM 8: RAM

9: processor

The present invention relates to a facsimile transmission and reception method so as to cope with fluctuations in line characteristics and distances between a transmission axis and a reception axis in an facsimile to perform efficient transmission and reception.

In the conventional transmission and reception method of the pixie, the user sets the transmit attenuator, the receive attenuator, the transmit / receive equalizer, the transmit / receive distance, or the number of error allowable lines beforehand in all cases. Since it is applied in the same way, there is a problem in that it is not possible to appropriately cope with each situation occurring in the transmission and reception states, and in some cases, an error continues to occur.

The present invention is to solve the above-mentioned problems, the facsimile is actively built in itself according to the line characteristics, distance between the transmitting and receiving sides, such as the transmission attenuator, the receiving attenuator, the number of error tolerance lines, etc. Efficient transmission and reception can be performed by setting a parameter, which will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a device for explaining the operation of the present invention, where (1) is a line, (2) is a line control unit, (3) is a comparative amplifier, (4) is a band pass filter (BPF), ( 5) is a modulator (MODEM), (6) is a decoder, (7) is a ROM, (8) is a RAM, (9) is a processor, R ₁ , R ₂ is a resistor, and R ₃ -R _N is A resistance group is shown, respectively.

Referring to the operation of the present invention in more detail by the flow chart shown in Figure 2 as follows.

In the initial state, the sender is placed on the facsimile and dialed to the other party using a key panel or the like. Next, when the line 1 is connected between the transmitting and receiving sides, the transmitting side enters Phase B in the protocol and transmits necessary signals and comments.

In addition, the receiving side transmits the response signal to the transmitting side. Next, the transmitting side and the receiving side receive the above signals and compare the line characteristics, transmission, and reception level between the transmitting side and the receiving side with the signals of the transmitting and receiving itself shown in ccITT T, 30 to set the necessary parameters. That is, after the signal passing through the line control unit 2 shown in FIG. 1 passes through the band pass filter (BPF) 4 through the comparison amplifier 3, the demodulation process is performed by the modem 5, which is a modulator. By comparison, the difference between the original transmission level and the reception level of the facsimile is controlled by the processor 9.

At this time, the processor 9 measures the degree of reception level when the parameter is abnormally set in the line characteristic.

Ten thousand and one transmitting, when the distance is too great for receiving Toilet the reception level is too low, because the resistance (R ₃₎ ... … Select a larger value from the value of (R _N ) to increase the level. If the reception level is too high, decrease it to adjust the reception level.

Even if the above conditions are carried out, when the reception level is low, the distance between the transmitting and receiving sides becomes too far, so the distance parameter is increased.

If the normal state is not achieved even after such correction, the number of error allowable lines is increased to prevent the N.G (No Good) state during transmission and reception, and the system enters the phase C state to receive the message.

Then, after the reception of the message is finished, the sender checks whether there is a next document, and when there is a next document, returns to receiving the message and completes data reception again.

As described above, according to the present invention, the facsimile machine actively sets parameters such as the built-in song, the receiving attenuator, the number of error-tolerant lines, etc. according to the line characteristics and distance with the receiving side. By performing the reception, the image quality, transmission and reception processing in a cleaner and clearer state can be performed.

Claims (1)

In the facsimile transmission and reception method, a signal passing through the line control unit 2 is applied to the modem 5 through the comparison amplifier 3 and the band pass filter 4 so that the original transmission level and reception level of the facsimile are changed. By comparing the difference, the processor 9 adjusts the reception level by measuring the degree of the reception level when the parameter is abnormally set in the line characteristic, and increases the distance parameter if the reception level is low even by the adjustment. If the adjustment is not made in a normal state, the number of error allowable lines is increased to prevent interruption during transmission and reception, and at the same time, the message reception is performed. Then, the message reception is terminated. The transmission and reception method in the facsimile which consists of the process of completing data reception again.

Images