JP2743844B2 - Communication terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device such as a facsimile machine and a telephone.

[0002]

2. Description of the Related Art For example, a facsimile apparatus with a telephone receives a call signal transmitted over a telephone line from a telephone exchange, and receives a picture data signal and a voice signal when the telephone line is connected. It has become. Here, the facsimile apparatus filters the calling signal from the telephone exchange to adopt only a signal in a set frequency band. Further, a timer detects an on-period during which a call signal is transmitted and an off-period during which the call signal is stopped, and compares the cycle with a set reference pattern to determine the type of signal and connect to a telephone line. It has become. If it is determined that the calling signal is a calling signal to the facsimile apparatus, the facsimile apparatus automatically enters the facsimile receiving mode to receive the image data. Is to be called.

[0003]

However, a filter circuit needs to be provided in order to adopt only a calling signal in a predetermined frequency band, which complicates the apparatus. Also,
The on-period and the off-period are detected by different timers, and when the detected values are compared with a reference pattern registered in the facsimile apparatus whether or not the detected value is a predetermined period, the on-period is compared with the on-period reference value. On the other hand, if the off-period is determined separately and individually as a reference value of the off-period, the processing takes time.

The present invention has been made to solve the above problems. An object of the present invention is to provide a communication terminal device capable of easily obtaining the frequency and ringing period of a call signal from count values of three timers.

[0005]

Means for Solving the Problems In order to solve the above problems, the invention (communication terminal device) according to claim 1 comprises a calling signal
A first timer started in synchronization with an incoming call;
It is activated at the same time as the time of Ima
A second timer that is cleared in synchronization with the arrival of the signal,
2 When the timer is activated at the same time as the
A third timer that is cleared in synchronization with the incoming signal and
Connected to the first, second and third timers, and
Of the first, second and third timers that are activated serially
From the start operation to the on and off periods of the call signal
A central processing unit for calculating each of them,
Before the first timer expires, the processing device
Call signal arrives, or the second timer expires.
If the next ringing signal does not arrive before the
Determines that the call signal of the desired frequency has not arrived,
The first timer times out and the second timer
After the time is up, the third timer times out.
Based on the clearing of the incoming call signal without
The off period of the call signal is calculated.
You. According to a second aspect of the present invention, there is provided the communication terminal device according to the first aspect.
Te, the central processing unit, between the setting pattern of the maximum value and the minimum value registered, the calculated on-time and off-life
It is characterized in that it is determined whether or not an interval exists . According to a third aspect of the present invention, there is provided the communication terminal device according to the second aspect.
The central processing unit includes the calculated ON period and
Off-period between registered maximum and minimum setting patterns
If it is determined to exist in the store one count, child determined to be when it counts a plurality of times incoming facsimile
And features .

[0006]

According to the above configuration, the first timer is activated in synchronization with the arrival of the call signal, and the second timer is activated when the first timer times out. The order to the second timer is cleared by the arrival of the next call signal, the period of the ringing signal is detected by both timer set to a predetermined time interval. On the other hand, if the second timer is not cleared and the time is up, the third timer is started. It is removed from the detection object when the second timer if the time is up, and that detects the arrival of the next call signal during operation of the third timer. That is, the first
The next ring signal arrives before the timer expires
Or before the second timer times out,
If the call signal does not arrive, the central processing unit returns to the desired circuit.
It is determined that the call signal of the wave number has not arrived.

Also, the central processing unit is started up serially.
From the count operation of the first, second, and third timers
Each of the ON period and the OFF period of the signal is calculated. So
Then, the first timer times out and the second timer
The third timer times out after
Based on the clearing of the incoming call signal without
Then, the off period of the calling signal is calculated .

According to a second aspect of the present invention, in addition to the operation of the first aspect, the maximum value and the minimum value registered by the central processing unit are registered.
Between the value setting patterns, the calculated on-period and
It is determined whether there is a time period. According to a third aspect of the present invention, in addition to the operation of the second aspect of the invention, the operation
Maximum and minimum values with registered on and off periods
Is determined to exist between the set patterns , the count is counted by one, and when the count is counted a plurality of times, it is recognized that a facsimile call is definitely received.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the communication terminal device of the present invention is embodied in a facsimile machine will be described below with reference to FIGS. As shown in FIG. 1, this facsimile machine 1
Means NCU (Network Control Unit) 3,
It has an attached telephone 4 and a CPU (central processing unit) 5. The NCU 3 has a function of controlling connection with a telephone line, a function of transmitting a dial pulse corresponding to a destination fax number, and a function of detecting an incoming call. Further, the calling signal is a calling signal C which is a binary signal of 0 or 1.
It has the function of converting to I. The attached telephone 4 performs a call operation with the calling side.

The CPU 5 as first and second detecting means includes:
ROM (read only memory) 6, RAM (random access memory) 7, modem 8, timer 9, operation unit 1
0, the reading unit 11 and the recording unit 12 are connected. The timer 9 includes first to third timers 9A to 9C and a ground timer 9G. The CPU 5 temporarily stores the transmission / reception data and the read data in the RAM 7, extracts the received data as needed, records it in the recording unit 12, and transmits the read data to another facsimile device via the modem 3. In addition, the tone detection circuit in the modem 3 detects the calling bell signal from the calling station, determines that facsimile reception is performed based on the detection signal, and connects the facsimile terminal to the line.

The ROM 6 stores a program for controlling the operation of the facsimile machine 2 as a whole and the operation of the NCU 3. The RAM 7 functions as a buffer for temporarily storing various information necessary for the operation of the CPU 5,
The count values of the second and third timers 9A, 9B and 9C are temporarily stored. The modem 8 modulates and demodulates transmission / reception data and generates a digital command signal (DCS) and a digital identification signal (DIS).

The first to third timers 9A, 9B, 9C and the ground timer 9G are counted at intervals of 1 msec. The ground timer 9G is activated by the call signal CI and is timed up in 10 seconds, and detects a time over when the caller goes on-hook and the call signal CI does not come. The first timer 9A is activated upon detection of the call signal CI, and in this embodiment, is 1000/20 (Hz) = 50.
The time is up after (msec). Second
The timer 9B starts up with the time-up of the first timer 9A, and when 1000/10 (Hz) = 100 (msec) elapses, the timer 9B is up-timed and further cleared when the call signal CI is detected. The third timer 9C is the second timer 9B
And the time is up when 600 (msec) has elapsed, and is cleared when the call signal CI is detected. That is, the second timer 9B immediately after the first timer 9A, and the third timer immediately after the second timer 9B.
The counting operation is performed serially with the timer 9C.

The operation unit 10 includes ten keys, function keys, and the like, and inputs a telephone number and the like. The reading unit 11 reads image data on a document, and includes a contact image sensor and a document conveyance system in which a light source, a mirror, a lens, a photoelectric element, and the like (not shown) are compacted integrally.
The recording unit 12 includes an ink jet or thermal head (not shown) and a document transport system.

Next, the three first to third timers 9A, 9A,
The operation related to 9B and 9C will be described. As shown in FIG. 2, a 16-Hz ringing bell signal is transmitted from an exchange (not shown) to the facsimile apparatus 1 via the NCU 3. The CPU 5 of the facsimile machine 1 uses the NCU 3 to
First to third timers 9 based on the coded call signal CI
A, 9B, 9C, etc. are activated. First, the CPU 5 activates the first timer 9A simultaneously with the input of the call signal CI.
Here, the time interval A until the first timer 9A times out
Is 50 (msec), and 1000/16 (Hz) =
It is shorter than the time period of the call signal CI at intervals of 62.5 (msec). Therefore, the first timer 9A times out before the next call signal CI rises. First
As soon as the timer 9A expires, the second timer 9B
Is started. The second timer 9B is driven at a time interval B of 100 (msec) and is cleared when the next call signal CI rises (incoming). That is, only when the arrival of the call signal CI is detected within the drive time of the first timer 9A and when the arrival of the next call signal CI is detected within the drive time of the second timer 9B, the rise of the call signal CI changes in frequency. Is detected. Call signal C indicated as OK as shown in FIG.
The rise of the calling signal CI can be detected at the position of the wave I. Then, for example, the first timer 9A
If the rising edge of the call signal CI is detected two or more times within the time interval A, the frequency is different from the frequency of the call signal CI or noise, and therefore, the CPU 5 does not judge the call signal CI. Also, if the second timer 9B has not been cleared even after the next rising edge of the call signal CI, 1
It is not determined that the call signal CI has a frequency significantly longer than 6 Hz.

On the other hand, in the off period of the call signal CI, the second timer 9B
Time up. At the same time, the third timer 9C is activated, and is cleared by the first rising of the calling signal CI in the next ON period. However, as shown in FIG.
When the timer 9C is cleared, it becomes NG and the frequency is not detected. Therefore, the time interval between the ON period and the OFF period (the interval between p and q in FIG. 2) is not erroneously detected as the period of the call signal CI.

In some cases, a signal other than the calling signal CI is detected within the count time A of the first timer 9A due to noise or the like. Then, the first timer 9A detects one or more waves of the calling signal CI within the driving time, and therefore, also in this case, it is NG and is not a frequency detection target. When the calling side is on-hook and the calling bell signal is not output from the telephone exchange, the ground timer 9G counts 10 seconds, and if no calling signal CI is input during that time, it is determined that no kind of calling signal CI is detected. The CPU 5 determines that the communication operation itself has been completed.

Next, a method of detecting the period of the ON period and the OFF period of the call signal CI will be described with reference to FIG. When the second timer 9B continues to be cleared as described above, it is an ON period, and when the third timer 9C is driven, it is an OFF period. The first ON period is the time T1 at which the first timer 9A rises and the second timer 9 at the end of the first ON period.
First timer 9A and second timer 9 until B is cleared
B is represented by the difference (T2−T1) between the integrated times T2.

The first OFF period is different from the end time T2 of the first ON period to the time T3 from when the ringing signal CI rises at the beginning of the next ON period until the third timer 9C is cleared (T3). T3−T2). Here, the first off period is determined only after the second timer 9B is cleared by the second rise of the call signal CI in the second on period shown by P in FIG. this is,
Since there is a possibility that a rise other than the call signal CI of 16 Hz may be detected within the count time of the third timer 9C due to noise or the like, it is necessary to confirm that the rise of the next call signal CI has been detected without fail. The time before that is taken as the off period.

Next, if the second timer 9B continues to be cleared in the second ON period, similarly to the first ON period, the ON period is updated, and the third timer 9C indicated by Q in FIG. Then, the ON period is determined. The second ON period is the difference between the time T3 when the first timer 9A starts up again and the accumulated time T4 of the first timer 9A and the second timer 9B until the second timer 9B is cleared at the end of the first ON period. (T4−T3) and stored in the RAM 7. In this way, when the times of the first ON period, the first OFF period, and the second ON period are determined, one-wave detection is completed. In this embodiment, the ring pattern of the facsimile communication has an ON period of 2 sec and an OFF period of 1 sec.

On the other hand, as shown in FIG. 4, the CPU 5 compares the modeled ring pattern for the facsimile number stored in the RAM 7 in advance with the sampled ring pattern. That is, it is determined whether or not the on / off period of the sampled ring pattern is included in the allowable value (time) of the on / off period of the modeling pattern. If the ON / OFF period of the sampled ring pattern is between the shortest time and the longest time, the CPU 5 recognizes the ring pattern as a signal of facsimile communication and counts one. Here, the shortest time and the longest time are the on-period 2 sec,
The off period is set to a range of ± 20% of the time of 1 sec, and specifically, the on period is 1.6 sec or more and 2.4 sec.
c and the off period is 0.8 sec or more and 1.2 sec.
If the value is less than or equal to c, it is determined that the sampled ring pattern is a pattern of a call signal CI of facsimile communication.

Next, similarly, the timer for the next one-wave detection time is updated again to sample the ring pattern, and the on / off period of this ring pattern is compared as shown in FIG. Count again. When the count is repeated as described above and the count number satisfies a predetermined number (for example, three times), it is definitely determined that facsimile communication is being performed, and the CPU 5 converts the facsimile apparatus to the facsimile communication mode.

By the way, when the facsimile apparatus
The operation shown in the flowchart of FIG. 5 is performed under the control of U5. First, in step (hereinafter referred to as S) 1, it is determined whether or not a bell signal has been generated on the telephone line, that is, whether or not the calling signal CI converted by the NCU 3 has been detected. If it is determined that the calling signal CI has been detected, the ground timer 9G of the timer 9 is operated in S2, and the first timer 9A is operated in S3. In S4, the CPU 5 determines whether the time of the first timer 9A has expired. If the time has expired, the CPU 5 immediately proceeds to the second timer 9B in S5.
Start.

On the other hand, if the next call signal CI or noise is detected before the time-out of the first timer 9A in S6, the first timer 9A is cleared in S7 and returns to S2. Here, if the time is not up in S4 and the calling signal CI is not detected in S6,
In step S8, the PU 5 determines whether the first off period has been updated. That is, it is determined whether or not the off period has been updated in S20 described later, that is, whether or not a part of the call signal CI has been detected. If the off period is not updated in S20, the process returns to S4 as noise. However, when the first timer 9A has shifted to the second ON period, that is, when the first OFF period has been updated, the CPU
5 is a RAM that buffers the first off period in S9
7 is stored.

It is determined in S10 whether or not the second timer 9B started in S5 has timed out by the CPU 5. If the time has expired, the CPU 5 immediately starts the third timer 9C in S11 in response to the time up. . On the other hand, in S12, the second timer 9
If B detects the next call signal CI before the time-up, the second timer 9B is cleared in S13. Then, in S14, the ON period is updated as it is, and the process returns to S3. The third timer 9C started in S11 is S1
At 5, the CPU 5 determines whether the time is up. If the time is up, the detection of one wave ends at S16. On the other hand, in S17, the third timer 9
If C detects the next call signal CI before the time-up, the third timer 9C is cleared in S18. Then, the on-period is stored in the buffer RAM 7 in S19, and the off-period is updated in S20.

When the detection of one wave is completed in S16 and the ring pattern is sampled, the CPU 5 determines whether or not the ring pattern is a facsimile transmission ring pattern. FIG. 4 shows a first on-period, a first off-period, and a second on-period in order to be able to determine that the on-period and off-period of the detected one-wave ring pattern are ringing in a facsimile transmission pattern. Should exist within a predetermined time of the modeling pattern. Specifically, the CPU 5 determines whether or not each ON / OFF period of the sampled ring pattern exists within the allowable value (time) of the ON / OFF period of the model ring pattern extracted from the RAM 7 serving as the buffer. .

In S22, the CPU 5 determines whether or not the data for the on / off period has been stored in the RAM 7. If the data for the on / off period has not been stored for any reason, it determines that an error has occurred and returns to S2. If it is determined that the storage is completed, it is determined in S23 whether or not each ON / OFF period is longer than the shortest time, and if it is determined that it is longer than the minimum time, it is subsequently determined in S24 whether it is shorter than the maximum time. I do. And CPU
If it is determined in S25 that the ON / OFF periods of the sampled ring pattern in S25 are equal to or longer than the shortest time and within the longest time, the ring pattern is determined to be facsimile communication and counted by 1 (S26). On the other hand, S
If it is determined at 23 or S24 that the on / off period is not within the range of the modeling pattern, it is determined that the ring pattern is not the ring pattern of the call signal CI of facsimile communication, and the process returns to S2.

In this manner, S1 to S16 are repeated, the timer for the next one-wave detection time is updated again, a new ring pattern is sampled, and the on / off period of this ring pattern is compared as shown in FIG. . CP in S27
U5 determines whether or not it has been counted as a modeling pattern of the call signal CI of facsimile communication three times in a row, and if it has been counted three times, determines that facsimile communication has arrived. Then, in S28, the facsimile apparatus is converted to the facsimile reception mode.

The following effects can be obtained by the above configuration. (1) Even if a frequency is not selected by providing a filter circuit, 3
One of the timers 9A, order to be able to detect any frequency only 9B and 9C, the complexity of the filter circuit is not required apparatus, high cost is prevented.

[0029] (2) The on-off period of the sampled ring pattern calculated from the values of the three timers 9A, 9B and 9C, without requiring a separate timer for the calculation of the on-off period, the circuit is Simplified.

(3) After one wave is detected, the RAM 7 determines the ON / OFF period of the sampled ring pattern.
Is compared with the facsimile transmission modeling pattern stored therein. If the ring pattern is a facsimile transmission ring pattern, counting is performed. If a predetermined number of ring patterns are counted, it is determined that facsimile communication has been performed. Therefore, since the line is connected after the facsimile communication is definitely determined, malfunctions are reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with the following modifications. In the above embodiment, as shown in FIG. 7A, the time interval of the on / off period is the same, so that the ring pattern has three periods of a first on period, a first off period, and a second on period. Only one cycle of the ring pattern could be sampled. However, actually, as shown in FIG. 7B, there is a call signal pattern in which short ON periods are mixed. In this case, the first on-period, the first off-period, the second on-period, the second off-period, and the third on-period total 5
Only when the period is detected, it can be determined that one cycle.
Therefore, in order to recognize a ring pattern for facsimile transmission when a short ON period as shown in FIG. 7B is mixed, it is necessary to compare the ring pattern with the model ring pattern until the third ON period.

In the above embodiment, the frequency of approximately 16 Hz depends on whether the arrival of the next call signal CI is detected by the time of the first timer 9A and whether the second timer 9B is cleared without time-up. Was determined to be. However, in order to detect the frequency more accurately, the time interval of the call signal CI is calculated by integrating the time until the time-up of the first timer 9A and the second timer 9B, and the frequency of the call signal CI is calculated from the time interval. May be detected. In this embodiment, the call signal CI
Is 16 Hz, and the time interval of one cycle is 62.
5 (msec). That is, an addition time obtained by adding the time for the time-up of the first timer 9A and the time until the second timer 9B is cleared may be made to correspond to this time interval (for example, set to about 60 to 65 (msec). Do). Further, a call signal CI of, for example, 60 Hz other than 16 Hz can be handled by changing the set value of the timer.

A communication terminal device other than the facsimile device,
For example, the present invention may be embodied in a telephone with an answering machine.
The number of ring patterns may be four or more and two or less. In addition, the present embodiment is free to be modified and implemented in a manner that does not depart from the gist, such that the maximum value and the minimum value of the ring pattern to be registered may be in a range other than ± 20%. .

[0034]

[0035]

As described in detail above, claims 1 to 3
According to the communication terminal apparatus of the invention, the start serially
Desired frequency from count operation of first, second and third timers
Can calculate the on-period and off-period of the paging signal
Possible to the, the need no device to provide a filter circuit as in the prior art can be simplified, cost reduction can be prevented
You. In the invention according to claim 2, the calculated on-period and off-period between the registered maximum value and minimum value setting patterns
For but to determine whether existing, can be accurately calculated between those periods <br/>. Further, according to the third aspect of the present invention, since the line is connected after the facsimile communication is definitely determined, malfunctions are reduced.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram showing one embodiment in which a communication terminal device of the present invention is embodied in a facsimile machine.

FIG. 2 is a timing chart showing a relationship between a cycle of a call signal and first timers 9A, 9B, and 9C in the same embodiment.

FIG. 3 is a timing chart showing a relationship between on / off periods of a call signal and first timers 9A, 9B, and 9C in the same embodiment.

FIG. 4 is an explanatory diagram illustrating that a ring pattern of a call signal should exist within a predetermined range in the same embodiment.

FIG. 5 is a flowchart illustrating an operation of detecting a frequency of a call signal and determining a ring pattern in the same embodiment.

FIG. 6 is the same flowchart.

FIGS. 7A and 7B are explanatory diagrams showing ring patterns of a call signal in the same embodiment. FIG. 7A is a ring pattern of the same embodiment, and FIG. 7B is a ring pattern of another embodiment.

[Description of Signs] 1 ... Facsimile machine, 5 ... CPU
(Central processing unit) , 9A: first timer, 9B: second timer, 9C: third timer.

Claims (3)

(57) [Claims] 1. A method which is started in synchronization with the arrival of a call signal.
When the timer is started at the same time as the time-out of the first timer,
, A second timer that is cleared in synchronization with the arrival of the call signal
When the time-up of the second timer and when activated at the same time co
, A third timer that is cleared in synchronization with the arrival of the call signal
When the first, it is connected to the second and third timers, this
Of these first, second and third timers
From the counting operation to the on and off periods of the call signal
A central processing unit for calculating each of them, wherein the central processing unit is configured to time out the first timer.
Before the next ringing signal arrives before the
The next ring signal does not arrive before the time expires
In this case, it is determined that the ringing signal of the desired frequency has not arrived.
And the first timer expires and the second timer expires.
After the time is up, the third timer times out.
Based on the clearing of the incoming call signal without
And calculating the off period of the call signal . 2. The central processing unit according to claim 1 , wherein the calculated on-period is between a registered maximum value and minimum value setting pattern.
2. The communication terminal device according to claim 1, wherein it is determined whether or not an off period exists. 3. The central processing unit according to claim 2 , wherein
Setting of the maximum and minimum values for which the off period and off period are registered
3. The communication terminal device according to claim 2, wherein when it is determined that the pattern exists between the patterns, one count is stored, and when a plurality of times are counted, it is determined that the incoming call is a facsimile.