JPH04280561A - Erroneous dialing deciding device - Google Patents

Abstract

PURPOSE:To reduce an erroneous dialing deciding time by deciding it an erroneous dialing when the caller facsimile upon checking whether or not a called party is a facsimile equipment after dialing a dial number. CONSTITUTION:Afer a dialing section 9 dials a dial signal, a tone detection section 7 detects a ring back tone. When the tone detection section 7 detects a busy tone, it is decided to be erroneous dialing. Since the busy tone is detected normally for 1-10sec in the case of misdialing, the erroneous dialing deciding time is reduced comparing with nearly 40sec in a conventional device. As an alternate system, after a dial signal is dialed by the dialing section 9, a polarity inversion detection section 11 detects polarity inversion. When the tone detection section 7 detects a busy tone or the polarity inversion again, it is decided to be erroneous dialing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incorrect dialing determination device, and more particularly to an incorrect dialing determination device that determines a dialed number to be an incorrect dialed number when the dialed number is not the number of a facsimile machine.

0002

[Prior Art] Conventionally, in facsimile machines,
An automatic call function is often used that automatically calls a telephone number by reading out a telephone number registered in a telephone number storage section inside the device using one-touch dialing or an abbreviated number. It also has a function to re-dial multiple times at predetermined time intervals if you are unable to connect to the other party's machine.

[0003] Using this function, the operator can call the other party's machine by operating a short number once.
Operability is greatly improved. However, if a wrong telephone number is registered in the telephone number storage section, the wrong party will be called every time a call is made, causing great inconvenience to the other party.

[0004] When the called party receives a call from a facsimile machine, there is no way to inform that it is a wrong call, so the calling party registers the wrong telephone number in the telephone number storage unit. The recipient ends up being called by the wrong number many times. Particularly, when a wrong call is received from a facsimile machine at night, the caller will be called multiple times using the redial function, greatly inconveniencing the receiver.

[0005] In order to solve the above-mentioned problem, for example, Japanese Patent Laid-Open No. 62-217776 discloses a system that checks whether or not an answer back tone is returned after dialing a dial number registered inside a facsimile machine. It has been proposed that if a facsimile machine is detected and an answer back tone is returned, it is determined that the other party is a facsimile machine and the dialed number is correct, and conversely, if an answer back tone is not returned, it is determined that the dial was incorrect. ing.

For example, as shown in FIG. 7, the facsimile machine on the calling side closes the line (step S1
), when a dial tone is detected (step S2 is affirmative), the dial number is called (step S3). Next, it is determined whether a busy tone has been returned (step S4), and if the answer is negative, an answer back tone is detected (step S5). When the answer back tone is returned, the process advances to step S6 and image information is transmitted.

On the other hand, if the answer back tone cannot be detected, the process advances to step S7 and an attempt is made to detect the answer back tone for T1 seconds. If it is not detected even after T1 seconds have elapsed, the process proceeds to step S8, where an interruption procedure is executed, and in step S9, it is determined that an erroneous dial has occurred. When it is determined that an incorrect dial has been made, the retransmission operation is prohibited. Here, the T1 second is T. 30 and is specified as 30 to 40 seconds.

Note that when it is determined in step S4 that the tone is a busy tone, the process advances to steps S10 and S11 to perform a retransmission operation.

[0009]

Conventionally, as described above, it has been detected whether or not the other party's machine is a facsimile machine based on the presence or absence of an answer back tone. According to this detection method, in order to accurately determine the presence or absence of an answer back tone, a maximum of about 40 seconds is required after the end of dialing the dialed number of the other party. For this reason, with conventional devices, it takes a long time to determine whether there is an incorrect dial.
There was the problem of monopolizing the line unnecessarily. Furthermore, if the called party picks up the handset upon hearing the ringing of the bell, and then returns the handset after learning that the call is coming from a facsimile machine, there is a problem in that it is impossible to determine whether or not it was a mistaken dial.

SUMMARY OF THE INVENTION An object of the present invention is to provide an erroneous dial determination apparatus that eliminates the problems of the conventional apparatus and can determine whether or not there is an erroneous dial in a short period of time. Another purpose is to detect an incorrect dial when the operator on the called side picks up the handset and goes off-hook, then goes on-hook after realizing that the call was made by mistake due to an incorrect dial. The object of the present invention is to provide a determination device.

[0011]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 includes tone detection means for detecting a ring back tone, an answer back tone and a busy tone; The present invention is characterized in that it includes an erroneous dial determination means that determines an erroneous dial when a busy tone is detected after the background tone is detected.

[0012] The invention according to claim 2 includes tone detection means for detecting an answer back tone and a busy tone; The present invention is characterized in that it includes an erroneous dial determination means that determines that the dial is an erroneous dial.

[0013] The invention according to claim 3 also provides a tone detecting means for detecting an answer back tone, a polarity reversal detecting means for detecting a polarity reversal, and a method for detecting erroneous dialing when the polarity reversal is detected again after the polarity reversal is detected. The system is characterized in that it is equipped with an incorrect dial determination means for determining.

[0014]

[Operation] In the line switching operation of facsimile communication, when a dial number is called, a ring back tone is returned, and when the called party closes the line, the polarity is reversed. On the other hand, if the called party subsequently releases the line, a polarity reversal occurs followed by a busy tone.

[0015] Therefore, in the invention of claim 1,
When the tone detecting means detects a ring back tone and then detects a busy tone, it is determined that an incorrect dial has been made.

[0016] According to the second aspect of the invention, when a busy tone is detected after the polarity reversal detecting means detects polarity reversal, it is determined that an incorrect dial has occurred.

[0017] In the third aspect of the invention, after the polarity reversal detecting means detects the polarity reversal, when the polarity reversal is detected again, it is determined that there is an incorrect dial.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. First, a general circuit switching operation for facsimile communication will be explained with reference to FIG. FIG. 6 shows a timing chart of line switching operations.

When the calling party closes the line, the exchange returns a dial tone to the calling party. When the dial tone is returned and the calling party issues a dialed number, the exchange returns a ring back tone to the calling party and sends a ring signal to the called party. A ring back tone is a pseudo tone that allows the calling party to know that the called party is being called. On the other hand, the ring signal is a signal for ringing a bell on the called side.

When the called party picks up the handset and goes off-hook in response to the ringing of the bell, the line is closed. When the exchange detects that the line has been closed, it reverses the polarity of the line connecting the exchange and the calling party. The calling party will know that the other party has answered when the polarity is reversed.

Next, if the called party is a facsimile machine, an answer back tone is sent from the called party. On the other hand, when the called party answers the call using a telephone, voice is sent back.

[0022] The calling party receives an answer back from the called party.
When the tone is received, the called party determines that it is a facsimile machine and transmits the prepared document information. Then, when the transmission of the document information is completed, the called party releases the line. On the other hand, if the called party is a telephone and a person answers, it is known that the calling party is a facsimile machine, so the telephone receiver is immediately put back on and the line is released.

When the called party releases the line, the exchange reverses the polarity of the line. A busy tone is then sent to the calling party. When the calling facsimile machine receives the busy tone, it takes action to release the line.

[0024] The present invention utilizes the circuit switching operation to
This system is designed to detect incorrect dialing, and will be explained in detail below.

FIG. 1 shows a block diagram of a facsimile machine according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes an operation section consisting of a numeric keypad and various function keys arranged on the console panel, 2 a reading section that reads the document information to be sent, 3 a recording section that prints out the received document information,
4 is an image processing unit that performs processing such as encoding or decoding on transmitted or received original information; 5 is a control unit that controls the entire facsimile communication; and 6 is a modulation/demodulation unit (MOD).
EM), 7 is a network control unit (NCU). Further, 8 is a telephone number storage unit that stores a one-touch dial or speed dial number and a full-digit dial number in association with each other, and 9 is a dialing unit that generates a dial signal for the selected speed dial. Reference numeral 10 denotes a tone detection unit for detecting the dial tone, busy tone, ring back tone, and answer back tone, which may be configured as an independent device in terms of hardware, or may be configured as an independent hardware device. A demodulator (MODEM) 6 may be used instead.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. As in FIG. 9, first, the line is closed (step S1), and when a dial tone is detected (affirmative in step S2), the facsimile machine on the calling side issues a dial number (step S3). Next, it is detected whether or not it is a busy tone, and if it is a busy tone, a retransmission operation is performed. If it's not a busy tone,
Proceeding to step S20, it is detected whether the ring back tone has ended. Note that in FIG. 2, the same or equivalent processes as in FIG. 7 are given the same reference numerals.

When the ring back tone ends (step S20 is affirmative), the process advances to step S5, where an answer back tone is detected (step S5). When an answer back tone is detected (step S5 is affirmative), image information is transmitted. On the other hand, the answer
If no back tone is detected, a busy tone is detected (step S21).

The reason for detecting the busy tone is as follows.

[0029] When the called party is not a facsimile machine, for example, when it is a person, the called party picks up the handset and closes the line due to the ringing of the bell. Users of are usually 1~
Hang up the phone in about 10 seconds and open the line. Then, as is clear from FIG. 6, the polarity is reversed and a busy tone is returned from the exchange. Therefore, if a busy tone is detected without detecting an answer back tone, it can be determined that an incorrect dial has been made, and the time required for this determination is usually 1 to 10 seconds.

Note that if no busy tone is detected in step S21, the process advances to step S7, where detection of an answer back tone is performed for T1 seconds as before.

[0031] When a busy tone is detected in step S21 (step S21 is affirmative), steps S22 and S
The process proceeds to step 23, where re-calling of the same number is prohibited and the line is released, and then it is determined that it is an incorrect dial.

As described above, according to this embodiment, incorrect dialing can be determined in about 1 to 10 seconds after the end of the ring back tone, so that the time required to determine incorrect dialing can be shortened.

Next, a second embodiment of the present invention will be described with reference to FIG. The block diagram of FIG. 3 differs from FIG. 1 in that a polarity reversal detection section 11 is added to detect that the polarity of the output signal of the network control section 7 has been reversed.

Next, the operation of this embodiment will be explained with reference to the flowchart of FIG. The only difference in the operation of the second embodiment from that of the first embodiment is that step S20 in FIG. 2 is replaced with step S31, so only that part is shown in FIG.

In this embodiment, when the called party answers, the ring back tone ends and the polarity is always reversed, so this polarity reversal is used as the starting point for detecting incorrect dialing.

It is clear that the same effects as in the first embodiment can be obtained in this embodiment as well.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 shows only the main parts of this embodiment, and the parts not shown are the same or equivalent to those in FIG. 2.

The third embodiment differs from the second embodiment in that a polarity inversion process (step S32) is provided in place of the busy tone detection in step S21. Figure 6
As is clear from the above, when the called party releases the line, the polarity is always reversed. In this embodiment, when this polarity reversal is detected, it is determined that an incorrect dial has been made.

It will be obvious that this embodiment can also provide the same effects as the first and second embodiments.

[0040]

[Effects of the Invention] As described above, according to the present invention, it is possible to reduce the time required for determining incorrect dialing to approximately 1 to 10 seconds after the dialed number is issued, thereby reducing wasteful exclusive use time of the facsimile machine. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the first embodiment.

FIG. 3 is a functional block diagram of second and third embodiments of the present invention.

FIG. 4 is a flowchart for explaining the main part of the operation of the second embodiment.

FIG. 5 is a flowchart for explaining the main part of the operation of the third embodiment.

FIG. 6 is a timing chart of normal line switching operation.

FIG. 7 is a flowchart for explaining a conventional erroneous dial detection operation.

[Explanation of symbols]

5...Control unit, 7...Network control unit, 9...Dial calling unit, 10
... Tone detection section, 11... Polarity reversal detection section.

Claims (3)

[Claims] Claims: 1. A misdialing detection device that detects whether or not the called party is a facsimile machine after dialing a dial number, and determines that the dial is a misdialing if the called party is not a facsimile machine; back·
An erroneous dialing system comprising tone detection means for detecting a tone and a busy tone, and erroneous dial determination means for determining an erroneous dialing when a busy tone is detected after the detection of the ring back tone. Judgment device. 2. A misdialing detection device that detects whether or not the called party is a facsimile machine after calling a dial number, and determines that the dial is a misdialing if the called party is not a facsimile machine. The method is characterized by comprising tone detection means for detecting a tone, polarity reversal detection means for detecting polarity reversal, and erroneous dial determination means for determining an erroneous dial when a busy tone is detected after polarity reversal detection. Erroneous dial detection device. [Claim 3] After the dialed number is called, an answer back tone is detected in an incorrect dial determination device that detects whether or not the called party is a facsimile device and determines that the dial is an incorrect dial if it is not a facsimile device. An erroneous dial determination device comprising a tone detection means, a polarity reversal detection means for detecting a polarity reversal, and an erroneous dial determination means for determining an erroneous dial when the polarity reversal is detected again after the polarity reversal is detected. .