JPH04280547A - Misdialing detector - Google Patents

Abstract

PURPOSE:To reduce the misdialing detection time. CONSTITUTION:After a dial signal is dialed by a dialing section 9, a tone detection section 7 detects a ring back tone. A control section 5 counts number of times of the ring back tone and compares it with a number of times of ring back tones stored in a memory section 13. Through the comparison, when the count of the ring back tones is coincident with the number of ring back tones stored in the memory section 13, it is discriminated to be a correct dial number and when dissident, it is discriminated to be a misdialied number.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an error dial detection device, and more particularly to an error dial detection device that detects a dialed number as an error dial number when it 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. 5, 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 Recommendation specifies 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 calling the dialed number of the other party. For this reason, in the conventional device, there was a problem in that the line was monopolized for a long time and wasted in order to determine whether or not there was an incorrect dial.

SUMMARY OF THE INVENTION An object of the present invention is to provide an erroneous dial detection apparatus that can eliminate the problems of the conventional apparatus and detect whether or not there is an erroneous dial in a short period of time.

[0011]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a memory section that stores the number of ring back tones in association with dialed numbers, and a memory section that stores the number of ring back tones in association with dialed numbers. The present invention is characterized in that it is equipped with a comparison section that compares the number of tones and the number of ring back tones stored in the memory section, and means for determining an incorrect dial when the comparison section determines that there is a mismatch. There is.

0012

According to the present invention, when a call is made with a predetermined dial number, the number of ring back tones returned is counted. Then, this count number and the number of ring back tones stored in the memory section are
They are compared in the comparison section. When the comparator determines that there is a mismatch, it is determined that there is an incorrect dial.

[0013] In this way, incorrect dialing can be detected based on the number of ring back tones, so the detection can be carried out in a short time.

[0014]

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.

[0018] 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.

Next, a specific example of facsimile communication to which the present invention is applied will be described with reference to FIG.

As shown in the figure, the present invention has a facsimile device at the center, and a plurality of predetermined facsimile devices, such as NO.
．． 1~NO. This is effective when a network such as broadcast communication is established between 10 facsimile machines. Here,
No. 1~NO. It is assumed that facsimile machine No. 10 is initially set to close the line after a predetermined ring back tone sounds when an incoming call is received. In the following description of the embodiment, the number of ring back tones initially set is "2".

Next, FIG. 1 shows a block diagram of an embodiment of a facsimile apparatus of the present invention suitable for use in the center. In the figure, 1 is an operation unit consisting of a numeric keypad and various function keys arranged on the console panel;
Reference numeral 2 denotes a reading unit that reads the original information to be transmitted; 3, the recording unit that prints out the received original information; 4, the image processing unit that performs processing such as encoding or decoding on the transmitted or received original information; and 5, the image processing unit The control unit controls the entire facsimile communication, 6 is a modulation/demodulation unit (MODEM), and 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. Demodulator (MO
DEM) 6 may be substituted. In addition, in the following explanation,
The ring back tone will be abbreviated as R.B.T.

Furthermore, 11 is a polarity reversal detection section, and 12 is R.
・B/T count setting section, 13 is a memory section.

Next, an example of data stored in the memory section 13 will be explained with reference to FIG. As shown in the figure, the memory unit 13 stores telephone numbers and the corresponding number of R, B, and T calls. The number of R.B.T can be freely set by the user from the R.B.T number setting section 12. In the illustrated example, NO. 1
~NO. For 10 telephone numbers, the number of R・B・T is set to “2”.

Next, the operation of this embodiment will be explained with reference to the flowchart of FIG. As in FIG. 6, first, the line is closed (step S1), and when a dial tone is detected (step S2 is affirmative), the calling side facsimile machine issues a dial number (step S3). Next, it is detected whether it is a busy tone or not (step S4).
, if it is a busy tone, a retransmission operation is performed. If it is not a busy tone, the process advances to step S5 and counts the number of R, B, and T sounds.

If it is determined in step S6 that there has been a polarity reversal, the process proceeds to step S7, where the count number of R, B, and T is changed to the R, B, and T counts corresponding to the dial number stored in the memory section 13. A determination is made as to whether the number matches the number of times B and T. In this embodiment, it is determined whether the count number of R, B, and T = 2 holds true.

If this determination is negative, the other party of the facsimile communication is not the correct one, so it is determined that the dial is an error, and the process proceeds to step S10. In step S10, re-calling of the same number is prohibited.

On the other hand, when step S7 is affirmative, it is determined that a connection has been made to the correct party, and an answer back tone is detected (step S8). When an answer back tone is detected (step S8 is affirmative), image information is transmitted. On the other hand, if no answer back tone is detected, a busy tone or polarity reversal is detected (step S9).

The reason for detecting the busy tone or polarity reversal is as follows.

[0030] When the called party is not a facsimile machine, for example, if it is a person, after picking up the handset and closing the line when the ringing ring is heard, the called party 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 or polarity reversal is detected instead of 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.

If no busy tone or polarity reversal is detected in step S9, the process advances to step S13, where answer back tone detection is performed for T1 seconds as before.

If step S7 is negative, step S9 is positive, or step S13 is positive, and it is determined that the dialed number is incorrect, step S1
0, a process for prohibiting re-calling using the same number is executed. Next, the process advances to step S11, and error processing such as displaying, printing out, or warning that it was an incorrect dial is executed. Next, the line is released and the series of processing ends.

As described above, according to this embodiment, it is possible to judge whether or not there is an incorrect dialing based on the number of R, B, and T returned from the called side, so that it can be determined quickly and accurately. It is possible to detect whether or not there is a wrong dial.

[0034] In the above embodiment, a network consisting of a center facsimile machine and related facsimile machines was explained as an example, but the present invention is not limited to this, and the number of R, B, and T calls is determined in advance. Of course, any network is effective for facsimile machines.

[0035]

[Effects of the Invention] As described above, according to the present invention, incorrect dialing can be detected by the number of times R, B, and T. This has the effect of reducing unnecessary exclusive use time of the facsimile machine.

[Brief explanation of the drawing]

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

FIG. 2 is a specific example of data stored in the memory section of FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the embodiment.

FIG. 4 is a diagram showing an example of a facsimile communication net to which the present invention is applied.

FIG. 5 is a flowchart for explaining a conventional erroneous dial detection operation.

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

[Explanation of symbols]

5...Control unit, 7...Network control unit, 9...Dial calling unit, 10
...Tone detection section, 11...Polarity reversal detection section, 12...R/B
- T count setting section, 13...memory section.

Claims (1)

[Claims] 1. An incorrect dial detection device for detecting whether or not a dialed number is a desired caller, comprising: a memory unit that stores the number of ring back tones in association with the dialed number; The number of ring back tones detected when making a call and the ring back tone stored in the memory section
An erroneous dial detection device comprising: a comparison unit that compares the number of back tones; and means for determining an erroneous dial when the comparison unit determines that there is a discrepancy.