JP3719434B2 - Communication terminal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication terminal apparatus such as a facsimile apparatus.
[0002]
[Prior art]
Some communication terminal devices such as facsimile machines have a so-called extended line function that is connected to a plurality of communication lines and receives or transmits a call from any of the communication lines. In this type of apparatus, there is a CI detection circuit that detects a CI (calling indication) signal that is a call signal corresponding to each communication line, and when the CI signal is detected by one CI detection circuit, the other CI is detected. Disable detection signal processing. The CI signal referred to here is, for example, a 16 Hz signal shown in FIG. CI signal detection is performed every time one wave is counted. Conventionally, when a CI signal obtained by detecting a signal of several HZ is detected by a signal detection CI detection circuit, if there is no variation in the CI signal, there is a search for another activation factor (see, for example, Patent Document 1). .
[0003]
[Patent Document 1]
JP 59-115672 A
[Problems to be solved by the invention]
In the apparatus having the extended line function, one or several CI signals of one communication line (one wave number is one) with respect to the other communication line because the communication lines are close to each other. If this is detected by the CI detection circuit of the communication line prior to the signal shown in FIG. 4 (a) like the signal shown in FIG. 4 (b), In the signal detection, the detection process of the regular CI signal of the other communication line is prohibited. As a result, the detection of the CI signal is delayed or cannot be detected. Even if the technique described in Patent Document 1 is adopted, this inconvenience cannot be solved.
[0005]
The present invention has been made paying attention to the above-mentioned problems, and provides a communication terminal apparatus that does not cause malfunction in detection of a call signal of another communication line due to noise mixed in the communication line in an apparatus having an extended line function. The purpose is that.
[0006]
[Means for Solving the Problems]
Communication terminal device according to the present invention, counts a communication line connecting section for connecting a plurality of communication lines, respectively, and the CI signal detection unit which detects a CI signal from each communication line, the number of CI signal of each communication line A CI signal counter to perform, a reference value storage unit for presetting and storing a numerical value to be invalid, and whether or not the CI signal count value is smaller than the reference value every time the CI signal is counted, A CI signal is ignored when the count value is smaller than the reference value, and an incoming call determination means for determining that there is a call signal when the CI signal count value is equal to or greater than the reference value . The incoming call processing is executed according to the determination .
[0007]
In the communication terminal apparatus of the present invention, the number of CI signal detected by the CI signal detection unit for each of the communication lines is counted by CI signal counter, reference the count value, in advance set and stored in the reference value storage unit If it is smaller than the value, it is ignored without the presence of a call signal, so detection of a regular CI signal is not hindered by CI signal noise mixed in other communication lines.
[0008]
In the communication terminal device according to the present invention, the reference value storage unit may use a nonvolatile memory. Once the reference value is set, it is not necessary to reset it even if a power failure occurs or the power is turned off.
[0009]
In the communication terminal device of the present invention, the reference value stored in the reference value storage unit may be set by operating the operation input means. An appropriate reference value can be easily set according to the communication status for each individual device.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a block diagram showing a circuit configuration of a facsimile apparatus according to an embodiment of the present invention. The facsimile apparatus according to this embodiment has an extended line function, and includes a control unit 1, a modem 2, a CI detection unit 3, a CI detection unit 4, a DC reproduction unit 5, a ROM 6, a RAM 7, and an image memory 8. And an operation unit 9 and a display unit 10, and further, although not shown, an image reading unit, an image recording unit, a CODEC, and the like. A Line (communication line) 1 and a Line (communication line) 2 are connected. Further, the CI detection unit 3 is connected to Line 1, and the CI detection unit 4 is connected to Line 2.
[0011]
The control unit 1 has a function of controlling each unit constituting this apparatus. It includes a function for detecting an incoming call with a function that controls connection with the communication lines Line 1 and Line 2 and transmits a dial signal corresponding to the telephone number (including the FAX number) of the other party. The modem 2 is an ITU (International Telecommunication Union) -T recommendation T.264. 30, T.M. Based on the facsimile transmission control procedure according to 4 or the like, 17, V. 27ter, V.I. The transmission data is modulated and the received data is demodulated in accordance with 29. Alternatively, in addition to these, V.P. 34, modulation of transmission data and demodulation of reception data are performed. When the CI detection unit 3 or the CI detection unit 4 detects a CI signal, the modem 2 is switched between Line 1 and Line 2 accordingly.
[0012]
The CI detection unit 3 detects a CI signal (signal shown in FIG. 4) from the communication line Line1. This CI signal is a 16 Hz signal, that is, 16 signals per second. The CI detection unit 4 detects a CI signal from the communication line Line2. When the CI detection unit 3 detects the CI signal from Line 1, the relay operates according to the detection signal, Line 1 is connected to the modem 2, and conversely, when the CI detection unit 4 detects the CI signal from Line 2, the detection signal As a result, the relay operates and Line 2 is connected to the modem 2. The direct current generating circuit 5 outputs a voltage for driving the telephone TEL.
[0013]
The ROM 6 stores a program for controlling this apparatus. The RAM 7 temporarily stores data. As shown in FIG. 3, the RAM 7 includes a CI interrupt invalid number memory 7a and a CI counter 7b.
[0014]
The CI interrupt invalid number memory 7a stores the reference value of the count value of the CI signal for invalidating the CI interrupt. The CI counter 7b counts the number of detections for each period (one wave) of the CI signal. These memories, particularly the CI interrupt invalid number memory 7a, are preferably constituted by nonvolatile memories. Further, the reference value of the CI interrupt invalid number memory 7a is preset and registered by the operation unit 10 in the range of 0 to 10, for example. The image memory 8 temporarily stores received image data and image data read by the image reading unit. The display unit (LCD) 9 displays icons, key buttons, message contents necessary for data transmission / reception, and the like. The operation unit 10 has an operation mode switching key for switching modes for a plurality of operation modes such as a one-touch key, a registration key, a FAX mode, a copy mode, and a scanner mode, a numeric keypad, a start key, and other keys.
[0015]
Next, CI interrupt processing when a CI signal is input from Line 1 or Line 2 of the facsimile apparatus of this embodiment will be described with reference to the flowchart shown in FIG. When this processing routine is started, it is determined in step ST1 whether a CI interrupt has occurred. This determination is made based on, for example, whether or not the CI detection unit 3 detects a one-cycle CI signal shown in FIG. When one CI signal is detected, the determination is YES and the process proceeds to step ST2. In step ST2, the control unit 1 captures CI signal detection, that is, captures a CI interrupt. Subsequently, the process proceeds to step ST3.
[0016]
In step ST3, the CI counter 7b is incremented by one. In the case of detection of the first first CI signal, the count value is 1. Subsequently, the process proceeds to step ST4. In step ST4, it is determined whether the storage reference value of the CI interrupt invalid number memory 7a is greater than zero. If the storage reference value is greater than 0, the process proceeds to step ST5. On the other hand, if the storage reference value is 0, the process proceeds to step ST6.
[0017]
In step ST5, it is determined whether or not the count value of the CI counter 7b is larger than the invalid reference value stored in the CI interrupt invalid number memory 7a. For example, if the invalid reference value is set and stored at 3, if the CI count value is 1, the determination is NO and the process returns to step ST1. On the other hand, when the CI signal is continuously input and the CI count value becomes larger than the invalid reference value, the process proceeds to step ST6. In step ST6, assuming that a normal CI signal has been detected here, incoming call detection processing in that Line is performed.
[0018]
For example, when the CI signal shown in FIG. 4A is input from Line1, two noises shown in FIG. 4B are input to Line2 in advance of this signal in terms of timing. Assuming the case and assuming that the set invalid reference value is 3, there are two CI signals (noise) input from the Line 2 to the CI detection unit 4. In the process of step ST5, the count value of the CI counter 7b is 2, the invalid reference value is 3, and since the determination signal is NO and the CI signal is not input, the input for the two CI signals is ignored and the incoming call detection process Is not executed. On the other hand, when the signal shown in FIG. 4A is input from Line 1, if the fourth signal input is detected by the CI detection unit 3, the determination in step ST 5 is YES, and the process proceeds to an incoming call process. It will be. That is, the relay is operated to connect Line 1 to the modem 2 so that a call from Line 1 can be received.
[0019]
According to the present invention, the invalid reference value is set and stored in advance, and the CI signal is ignored when the detected CI signal count value of each communication line is smaller than the reference value, and is called when the reference value is greater than the reference value. Since incoming calls are processed with the presence of a signal, by arbitrarily setting a reference value, it is possible to appropriately prevent delays in detection of regular call signals due to noise in other communication lines and omission of detection in accordance with system conditions.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main configuration of a facsimile apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining CI interrupt processing of the facsimile machine according to the embodiment;
FIG. 3 is a view showing a memory arranged in a RAM of the facsimile apparatus according to the embodiment;
FIG. 4 is a waveform time chart illustrating a CI signal input to the facsimile apparatus of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Control part 2 Modem 3, 4 CI detection part 5 DC generation part 6 ROM
7 RAM
7a CI interrupt invalid number memory 7b CI counter 8 Image memory 9 Operation unit 10 Display unit Line1, Line2 Communication line

Claims (3)

A communication line connecting section for connecting a plurality of communication lines, respectively, and the CI signal detection unit which detects a CI signal from each communication line, and the CI signal counter for counting the number of CI signal of each communication line, invalid A reference value storage unit that preliminarily sets and stores a numerical value that serves as a reference, and determines whether or not the CI signal count value is smaller than the reference value every time the CI signal is counted, and the CI signal count value is smaller than the reference value In this case, a CI signal is ignored, and when the CI signal count value is equal to or greater than the reference value, there is an incoming call determination means for determining that there is a call signal. A communication terminal apparatus characterized by being executed . The communication terminal apparatus according to claim 1, wherein a nonvolatile memory is used as the reference value storage unit. The recording apparatus according to claim 1, wherein the reference value stored in the reference value storage unit is set by operating an operation input unit.

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