JPS59193667A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To prevent useless deterioration in picture quality by eliminating a control signal included in a picture signal for a predetermined constant time or until end of operation when the control signal is detected during picture transmission to confirm that the control signal comes from an opposite equipment. CONSTITUTION:An output from an LPF2 of the facsimile equipment is applied to a BPF3, which eliminates an instantaneous stop signal PIS component, the result is applied to a modulator 6 via a signal switching curcuit 4, modulated by a carrier and transmitted to a receiving side via a hybrid circuit 9 and a network controller 10. Further, the output of the BPF12 of the receiving side is provided with a PIS signal detecting circuit 15, and when a PIS signal is detected, a signal of level 1 is outputted by a control circuit 16. The signal on a signal line 16a of the circuit 16 is inputted to the circuit 4, and when the receiving side detects the PIS signal, the output of the BPF 3 is applied to the circuit 4 for a prescribed time or until end of operation. Further, if no PIS signal is detected, the signal line 16a is brought into ''0'' level, an output of the LPF2 is applied to the circuit 4 to prevent useless deterioration in the picture quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a facsimile machine, and more particularly to a facsimile machine that can immediately stop when it detects an immediate stop signal sent from the other party's facsimile machine during image transmission or facsimile procedure. It is related to.

Prior Art In conventional facsimile machines, PIS (Plcedur) is used in G2 communication or mini-fax communication.
cInterrupt Signa! ) signal, that is, an immediate stop signal, some facsimile machines immediately stop, call an operator, or terminate with an error.

The biggest problem here is that while transmitting image information, it is necessary to detect a PIS signal in which the amplitude level of the signal sent from the other party's facsimile device is attenuated.

To solve this problem, the facsimile apparatus usually has a hybrid configuration for its transmitting system and receiving system, and detects the PIS signal before transmitting image information.

However, if the impedance cannot be matched with the line, the hybrid circuit will not be able to completely divide the transmitting system signal and the receiving system signal by νI+, and the transmitting system signal will loop into the receiving system. .

Here, the image information includes the frequency component of the PIS signal.

Therefore, if there are many frequency components of the PIS signal included in the image information, or if there is a large matching with the impedance of the line, the PIS signal will be detected as the image information being transmitted wraps around to the receiving system. There was a drawback that the fax machine would be mistakenly recognized as being incorrect and the fax machine would immediately stop.

In order to eliminate such drawbacks, the applicant has previously proposed the following.

It is configured to remove the PIS signal when transmitting an image, and as a result, there is no longer a situation where the system is mistakenly recognized as an IS signal and immediately stopped due to impedance mismatching with the line.

However, before modulation, a signal of 163
8) (Since the image signal component in the transmission system of the frequency z is removed, there is a drawback that the image quality is slightly degraded.

Purpose The present invention has been made to eliminate the above-mentioned conventional drawbacks, and when an immediate stop signal is detected during image transmission,
It is an object of the present invention to provide a facsimile device having a mechanism for confirming that the signal is sent from the other party's facsimile device and is not a signal mixed in from the transmission system.

For this purpose, the following method is used. If an immediate stop signal is detected during image transmission in a facsimile device that can be stopped immediately during image transmission or procedure, the same immediate stop signal included in the image information being transmitted will be used for a certain period of time or until the end of a certain operation. Remove frequency signal components. Even after taking such measures, if an immediate stop signal is detected, it may be determined that this is a real immediate stop signal from the other party's facsimile machine. vice versa,
After taking such measures, if the immediate stop signal is no longer detected, it can be determined that this signal was a mixed signal from the transmission system.

In this way, when an immediate stop signal is detected, by temporarily removing the immediate stop signal included in the image information, it is possible to determine whether the immediate stop signal was detected from the other party's facsimile machine or from the sending system's image. You can check whether it is a mixed signal from information.

Note that since the transmitting system and the receiving system have an hybrid configuration, it goes without saying that an immediate stop signal from the other party's facsimile machine can be detected even in image information.

EXAMPLES Hereinafter, details of the present invention will be explained based on the actual and flow sides shown in the drawings.

FIG. 1 explains one embodiment of the present invention, and shows a case where a configuration is adopted in which a PIS signal component is removed before modulating image information.

In the figure, the reference numeral 1 denotes a 2-3 value conversion circuit, which converts the signal on the signal line 1a, which is a binary image signal obtained by photoelectric conversion, into a 3-value code. This ternary code is input to the low-pass filter 2 through the signal line 1b.

This filter limits the band of the ternary code so that aliasing distortion does not occur during modulation. The signal that has passed through this filter is input to the band-removal filter 3 via the signal line 2a. This filter is a band elimination filter that removes a frequency component obtained by subtracting the PIS signal frequency from the carrier wave frequency before modulating the image information during image transmission.

By the way, the frequency of the carrier wave is 2100Hz, and the PI
Since the frequency of the S signal is 462 Hz, the center frequency of the band-rejection filter is 1638 Hz.

The signal that has passed through the filter 3 is input to the signal switching circuit 4 via the signal line 3a.

This circuit 4 inputs a signal on a signal line 16a, which will be described later.If this signal is at level "0", it outputs a signal on the signal line 2a to the signal line 4a; conversely, if it is the moon, the signal on the signal line 3a is It is configured to output a signal to the I word line 4d.As will be described later, the signal level of the signal line 1Sa is such that when the receiving system detects an immediate stop signal, a certain operation ends immediately for a certain period of time. [month], otherwise fd IO
It is J. Therefore, when the immediate stop signal is detected, the signal on the signal line 2a, that is, the original complete image information, is sent to the signal line 4a, and after the immediate stop signal is detected, a certain period of time or a certain operation is performed. Until the end, signal line 4a
The output of the signal line 3a, that is, the image signal from which the immediate stop signal is removed is output.

The signal that has passed through the signal switching circuit 4 is input to the modulator 6 via the signal line 4a.

On the other hand, the modulator 6 receives 2100H from the carrier generation circuit 5.
A carrier wave of z is input, and the signal on the signal line 4a is modulated by this carrier wave.

The modulated signal is passed through the signal line 6a to the VSB filter (
(residual sideband filter) 7.

The VSB filter 7 is a low-pass filter that attenuates the amplitude level by 6 dB at the carrier frequency and has point-symmetric amplitude characteristics.

The signal that has passed through this filter is input to the fixture 8 via the signal line 7a. In the fixture 8, the attenuation distortion of the telephone line is corrected, and the signal passing therethrough is input to the hybrid circuit 9 via the signal line 8a.

In the hybrid circuit 9, a transmission system signal and a reception system signal are separated.

Signal line 8a/signal line 9a of hybrid circuit 9
is transmitted to the telephone line 10a via the network control device 10.

Further, a signal sent from the other party's facsimile machine is output from the no-brid circuit 9 to the signal line 9b via the network control device 10.

If the impedance of the telephone line 10a is 600Ω, it is possible to separate the transmitting system signal and the receiving system signal. However, if the impedance of the telephone line deviates from 600Ω, signals from the transmitting system will go around to the receiving system.

On the other hand, the network control device 10 is used to use the telephone network for data communication, etc., and controls connections to the telephone exchange network,
Switches to data communication path and maintains loop.

By the way, the signal from the other party's facsimile device is sent to the equipment 1 via the network control device 10,/the hybrid circuit 9.
1, the attenuation distortion and group delay distortion are corrected, and the signal line 11
a to the bandpass filter 12. and,
Here, billing pulses, noise, impulsive noise, etc. are removed, and the signal is input to an AGC (automatic gain adjustment circuit) circuit 13 via a signal line 12a.

This AGC circuit 13 compensates for the amount of attenuation caused by the telephone line and amplifies it to a constant level, and this amplified signal is input to the demodulator 14 via the signal line T' 2 a.

The demodulator 14 extracts a carrier wave from the signal on the signal line 13a,
The received baseband signal obtained as a result of simultaneous detection and full-wave rectification is output to the signal line 14a.

By the way, what is indicated by reference numeral 15 is a PIS signal detection circuit, which inputs the signal on the signal line 12a and detects whether 462H2, which is the frequency of the PIS signal, is at a certain amplitude level and continues for a certain period of time or not. do.

Then, if the PIS signal is not detected, the signal is
Line 15 j+ VC (d i 1st level/lz rO
j l)' Lb is input, and when a PTS signal is detected, a signal level ' is output to the signal line 15a.

Reference numeral 16 indicates a control circuit that performs the control described below.

This control circuit is connected to the signal line 1 at the point where the PIS signal is detected.
6a, and as a result, the signal switching circuit 4 receiving the signal changes the unmodified image signal, that is, the signal on the signal line 2a, to the signal line 2a. It is output to line 4a.

1:' When the J-S signal is detected, the control circuit 16 outputs a signal of signal level "1" to the signal line 16a, and as a result, 1
Signal switching circuit 4P receiving and receiving the signal 6a 1.
The image signal from which the S signal has been removed, ie, the signal on the signal line 3a, is output to the signal line 4a.

After a certain period of time (1) the time during which the IS signal detection circuit 15 responds after the PIS signal is detected, the control circuit 16 inputs the signal on the signal line 15a again. At this time, if the signal level of this signal is [moon, that is, the P
If the PIS signal is still detected even after the IS signal is removed, it is determined that this is a transmission from the other party's facsimile machine, and the process is immediately stopped and an operator call or error termination occurs. On the other hand, if the signal level of the signal line 15a is 10'' at this time, that is, if the PIS signal is no longer detected after removing the PIS signal component included in the image information, the previous It is determined that the PIS signal is a signal from the transmitting system mixed into the receiving system and is not sent from the other party's facsimile machine, and it is not stopped immediately, but after a certain period of time has elapsed, or when a certain operation is completed ( For example, after completing the electronic transmission of one document currently being transmitted, a signal of signal level rOJ is output to the signal line 16a, and the
Return to the state before IS signal detection.

FIG. 2 is a flowchart of the control operation of the control circuit 16.

In step 1 in FIG. 2, the control circuit 16 outputs a signal of signal level rOJ to the signal line 16a.

At this time, the immediate stop signal component is not removed from the image information.

It is determined whether the level is "1" or not, that is, whether or not a PIS signal is detected. When the PI8 signal is detected, the process proceeds to step 3. Otherwise, this step is repeated again.

In step 3, the signal level "]" is applied to the signal line 16a.
” signal, and when transmitting an image, PIS is detected from the image information.
Remove components of the signal. Then, whether the PIS signal detected in step 2 was a signal from the other party's facsimile machine or whether it was a PIS signal included in the image information.
Detect whether it was caused by a signal.

In step 4, it is determined whether a certain fixed time t1 has elapsed, that is, the time t1 at which the PIS signal detection circuit 15 responds.
It is determined whether the period has elapsed. When a certain period of time t1 has elapsed, the process proceeds to step 5. Otherwise, this step is repeated again.

In step 5, it is determined whether the signal on the signal line 15a is at the signal level of January or not, that is, whether a PIS signal is detected or not. At step 50, since the PTS signal component is removed from the image information, the PTS signal component is removed from the image information.
If an IS signal is detected, it is determined that a signal from the other party's Noakunmi IJ device has been detected, and the process proceeds to step 6.

On the other hand, if the signal on the signal line 15a has a signal level of "0", that is, if no immediate stop signal is detected, the immediate stop signal detected in step 2 is a misunderstanding of the immediate stop signal component of the image information of the transmission system. It is determined that there is, and the process proceeds to step 7.

In step 7, the process waits until a certain period of time t2 has elapsed, and then returns to step 1.

It is also possible that the content of the determination in step 7 is the end of a certain operation (for example, completion of electronic transmission of the document currently being transmitted).

Since this embodiment is configured as described above, P1.
It is possible to immediately stop the transmission after confirming that the S signal is sent from the other party's facsimile machine.

Second Embodiment FIG. 3 is a block diagram illustrating a second embodiment of the present invention.

In this embodiment, as a method for removing an immediate stop signal included in image information during medical image transmission, after modulating the image information, P1. A configuration is adopted that removes the S signal component.

In FIG. 3, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

17, after modulating the image information during image transmission, 1) I
8 signal (immediate stop signal) frequency (i.e. 4.62H
This is a band-removal filter that removes the component 2). The center frequency of this band-removal filter 17 is 4621-12. The signal after passing through the band-rejection filter is connected to the signal line +
7a.

18, the signal on the signal line 16a is input, and when this signal is at the signal level rOJO, the signal on the signal line 6a is output to the signal line 18a, and the signal on the signal line 16a is input, and this signal has the signal level "1". In this case, the signal on signal line 17a is transferred to signal line 1.
This is a signal switching circuit that outputs to sa.

This signal switching circuit 18 plays the same role as the signal switching circuit 4 shown in FIG. 1. Even if such a structure is adopted, the same effects as in the embodiment described above can be obtained.

In both of the above two embodiments, the control signal for the facsimile machine is an immediate stop signal, and in this respect they fall under the scope of claim 2. However, as stated in claim 1, the control signal is 46
It is also possible to use a signal other than 2H7 and perform control based on the control signal. In particular, it is also possible to use a backward channel signal as this control signal.

Effects As is clear from the above explanation, according to the present invention, when a control signal is detected during image transmission or during a procedure, a facsimile machine that performs an operation based on the control signal detects the control signal. You can check whether the fax was sent from the other party's facsimile machine without causing unnecessary image quality deterioration.
This has the effect of being able to be confirmed.

[Brief explanation of drawings]

1 and 2 are block circuit diagrams illustrating one embodiment of the present invention and flowcharts illustrating control operations, and FIG. 3 is a block circuit diagram illustrating another embodiment of the present invention. 1,... 2-3 value conversion circuit 2... Low pass filter 3.17... Band removal filter 4, 18... Signal switching circuit 5... Carrier wave generation circuit 6... Modulator 7.
・・VSB filter 8・・Furnishings 9 ・Circuit 10・Network control device 11・・Furnitures
12...Band pass filter 13...AGC circuit 14...Demodulator 15...PIS signal detection circuit 16...Control circuit. Patent applicant: Can) 3e Co., Ltd.

Claims (4)

[Claims] (1) When a control signal is detected during image transmission or during a procedure, a facsimile machine that performs operations based on the control signal, if the control signal is detected during image transmission, Remove the control signal that is being transmitted for a predetermined period of time or until the end of a certain operation, and check that the control signal component detected during that time is a signal from the other party's facsimile machine and is not mixed with a signal from the transmission system. A facsimile device characterized by being equipped with a mechanism that can confirm. (2) The facsimile apparatus according to claim 1, wherein the control signal is an immediate stop signal. (3) The means for removing the control signal included in the image information is a means for removing a frequency component obtained by changing the frequency of the control signal from the frequency of the carrier stage before modulating the image information. A facsimile machine according to claim 1 or 2. (4) The means for removing the control signal included in the image information is a means for removing a frequency component of the control signal after modulating the image information. The facsimile machine according to item 2.