JPH1127493A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide facsimile equipment that can be connected to a private line and a public line in which a control system for dialing to communication start is properly controlled depending on a connected line and communication is conducted efficiently. SOLUTION: Facsimile equipment having a CODEC 40 connected to a private line 48 and to PSTN 46 is provide with a registration circuit 32 that stores a characteristic of a telephone number used for a call to the private line 48, detects a call to the private line 48 by collating a telephone number received from an operation section 24 or the like, where a control circuit 20 selects an optimum communication system for connection to the private line 48 and for connection to the PSTN 46 respectively. A communication modulation system, a communication baud rate, and a communication data rate used for each destination or the like are stored in the registration circuit 30 and the communication system is controlled by referencing the registration circuit 30 in the case of conducting the communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a facsimile machine,
In particular, the present invention relates to a facsimile apparatus capable of connecting to a dedicated line and a public line.

[0002]

2. Description of the Related Art In a conventional facsimile apparatus, there is known a technique for providing a means for registering a transmission start speed for a communication destination in advance and determining the transmission start speed based on a past communication history. .

On the other hand, a facsimile apparatus capable of connecting to a dedicated line and a public line via a CODEC is known. Such a facsimile apparatus is used when connecting to a public communication network or connecting to a dedicated line. Therefore, switching between the control at the time of calling and the control of starting communication has not been considered.

[0004]

For example, ITU-T
Recommendation V. A facsimile apparatus capable of performing communication conforming to V.34 is connected via a dedicated line, and CODEC is connected to V.34. ANSam, CM, J
The M and CJ signals can be communicated, for example, as audio, but subsequent line probing communication becomes impossible. Here, V. Since full-duplex communication in eight procedures has been completed,
34 communication. In this case, it takes time (the number of times of communication), and there is a major drawback that unnecessary communication occurs many times.

[0005] CODEC supporting up to 29
In the above, the information modulated by the facsimile apparatus is demodulated once and transmitted to the other party's CODEC at 9.6 Kb / s of digital information. From here, the modulated signal is transmitted to the other party's facsimile apparatus. You. Where CO
In facsimile communication between DECs, a proprietary procedure using an NSF signal and proprietary transmission are prohibited. On the other hand, a signal determined to be audio is analog information transmitted to CODEC, A / D converted by CODEC, transmitted as 16 Kb / s digital information, D / A converted again by CODEC, and the other party's (voice) Sent to the terminal as analog information.

As described above, in communication via a dedicated line, voice is A / D converted and D / A converted and transmitted. On the other hand, facsimile information is modulated and demodulated and transmitted. What can be processed as facsimile information is
It is a communication modulation unit. For example, V. 29, then V.29. The facsimile machines on both sides are determined by V.17 standards. Even if 17 communications are possible, 14.4 Kb / s cannot be transmitted by digital information between CODECs.
V. If you try 17 communication, it will fall back,
V. No communication was possible up to 7200 b / s of V.17. 27te
Communication can be performed for the first time at r of 4800 b / s.

In the conventional system, such a fallback may occur every time, and there is a problem that efficient communication is impossible.

On the other hand, in a public communication network, When a facsimile apparatus capable of performing communication is performed, it is necessary to select an appropriate baud rate and bit rate. I can't fall back to 17. Because V. If you fall back to 17, This is because there is no point in having a communication function.

SUMMARY OF THE INVENTION An object of the present invention is to provide a facsimile apparatus capable of connecting to a dedicated line or a public line by appropriately controlling a control system from calling to communication start according to the line to be connected, and efficiently communicating. It is to provide a facsimile machine which can be used.

[0010]

According to the present invention, there is provided a facsimile apparatus which is connected to a dedicated line and a public communication network and performs communication using the dedicated line or the public communication network. A configuration including means for detecting whether to connect to the dedicated line or the public communication network when making a call, and control means for selecting an optimal communication method in each of connection to the dedicated line and connection to the public communication network It was adopted.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 shows the configuration of a control system of a facsimile apparatus employing the present invention.

In FIG. 1, reference numeral 2 denotes an NCU (Network Control Unit) which is used to connect a telephone network to a terminal of the line and to control connection of a telephone exchange network or to use a data network in order to use the telephone network for data communication or the like. It switches to a communication path and holds a loop. The NCU 2 connects the communication line 2a to the telephone 4 when the signal level (signal line 20a) from the control circuit 20 is "0", and connects the communication line 2a to the facsimile apparatus when the signal level is "1". Side. In the normal (standby) state, the communication line 2a is connected to the telephone 4 side.

Reference numeral 6 denotes a hybrid circuit which separates a transmission system signal and a reception system signal, sends a transmission signal from the adding circuit 12 to the communication line 2a via the NCU 2, and transmits a signal from the other party via the NCU 2 And sends it to the modem 8 via the signal line 6a.

Reference numeral 8 denotes a modulator / demodulator, which is based on ITU-T Recommendations V.8, V.21, V.27ter, V.29, V.17,
And a modulator / demodulator that performs modulation and demodulation based on V.34 and receives the designation of each of these transmission modes via a signal line 20c. The modulator / demodulator 8 receives a signal output on the signal line 20b, outputs modulated data on the signal line 8a, receives a received signal output on the signal line 6a, and outputs demodulated data on the signal line 8b. .

Reference numeral 10 denotes a circuit for transmitting an ANSam signal. When a signal of signal level "1" is output to the signal line 20d, the ANSam signal is transmitted to the signal line 10a and the signal level is sent to the signal line 20d. When the signal “0” is being output, no signal is output to the signal line 10a.

Reference numeral 12 denotes an addition circuit, which inputs information on the signal line 8a and information on the signal line 10a, and outputs a result of the addition to the signal line 12a.

Reference numeral 14 denotes a circuit for reading image data.
It has a known configuration including a document transport system, an optical reading element, and the like, and read image data is output to a signal line 14a.

Reference numeral 16 denotes a recording circuit for recording image data, which is constituted by various recording methods such as an electrophotographic method and an ink jet method. Here, the recording circuit 16
Means that the information output to the signal line 20e is sequentially converted into a bit image for each line and recorded.

Reference numeral 18 denotes a memory circuit, which is mainly used for storing image information, and stores raw information of read image data or encoded image information, and raw received image information or decoding. It is used to store the obtained image information and the like.

Reference numeral 22 denotes a calling circuit, which is a signal line 20g.
When a call command pulse is generated, the telephone number information output to the signal line 20f is input, and a selection signal is output on the signal line 2b.

Reference numeral 24 denotes an operation unit which includes a one-touch dial, an abbreviated dial, a numeric keypad, a * / # key, a registration key for the set key circuit 30, a registration key for the circuit 32, a start key, and other function keys. The key information is output to the signal line 24a.

Reference numeral 26 denotes a button for selecting whether or not the facsimile apparatus is connected to a dedicated line for at least one destination. Each time the button is pressed, a pressing pulse is applied to the signal line 26a. Occurs.

Reference numeral 28 denotes a display circuit indicating that this facsimile apparatus is connected to a dedicated line for at least one destination. When a clear pulse is generated on the signal line 20h, no display is made. Every time a press pulse is generated on the signal line 26a, "display" → "not display" →
Repeat "display". Display circuit 2 with connection to dedicated line
When 8 is displayed, a signal of signal level "1" is output to the signal line 28a, and when not displayed, a signal of signal level "0" is output to the signal line 28a.

The control circuit 20 determines whether or not a dedicated line is connected according to the display on the display circuit 28 (ie, the operation state of the button 26).

Reference numeral 30 denotes a circuit corresponding to each destination of one-touch dialing and speed dialing, and registering a communication system via a signal line 30a. Here, when the destination is connected to a dedicated line, 34, V.I. 17, V.I. 29, V.I. 2
If only the communication modulation system of 7 ter is registered corresponding to each destination, and the destination is connected to a public communication network, V.7. 34, V.I. 1
7, V.I. 29, V.I. 27ter communication modulation system; 3
When four communications are registered, the baud rate and transmission speed are registered for each destination.

Reference numeral 32 denotes a circuit for registering the characteristics of the telephone number of the dedicated line via the signal line 32a. Here, for example, a 4-digit telephone number is connected to a dedicated line, and a 5-digit telephone number is connected to a public communication network.

The registration circuits 30 and 32 are composed of a memory circuit such as an EEPROM, and store the data registered in a predetermined manner. The method of registration is arbitrary. For example, as described later, it is conceivable to register each of the data for each destination in accordance with a predetermined operation from the operation unit 24.
For example, it is conceivable to register data input via an arbitrary interface, such as registering data downloaded via a line.

Reference numeral 40 denotes a PSTN 46 and a dedicated line 48
As an interface for connecting the device to the
DEC.

The CODEC 40 transmits data from the facsimile machine (block 2 to block 32) to the public communication network (PST).
When voice or facsimile communication to N) is selected,
It is connected to PSTN 46 via signal line 46a.

When voice communication to a dedicated line is selected,
Communication is performed via a dedicated line of the signal line 48a. In this case, the audio data is A / D-converted to 16 Kb / s digital information by the CODEC 40, and sent to the CODEC 42 (on the other side) via the dedicated line 48a. , CODEC4
2, and is output to the facsimile machine 44 (on the other side) via the signal line 42a.

When the facsimile communication to the dedicated line is selected, the communication is performed via the dedicated line of the signal line 48a.
Digital information of 4.4 Kb / s or a maximum of 9.6 Kb / s is transmitted through a dedicated line (signal line 48a) through COD.
The digital information is sent to the EC 42, and the CODEC 42 modulates the digital information and outputs the modulated digital information to the signal line 42a.

Reference numeral 20 denotes a control circuit, which comprises a microprocessor or the like, and controls the operation of the entire apparatus. The control by the control circuit 20 according to the present invention is as follows.

In the present embodiment, a button 26 and a display circuit 28 are provided as means for setting the presence / absence of connection to a dedicated line. The control circuit 20 changes the communication modulation method and the communication speed determination method when the connection to the dedicated line is selected and when the connection to the public communication network is selected.

That is, when a connection is made to a dedicated line, a communication modulation unit (specifically, ITU-T
Recommendation V. 34, V.I. 17, V. 29, V.S. 27ter), and when connecting to a public communication network, the communication to be started includes a communication modulation method and a communication baud rate (V.34).
Only), control at all communication speeds.

Whether each destination is connected to a dedicated line or a public communication network is determined by assuming that the characteristics of the telephone number connected to the dedicated line are, for example, four-digit telephone numbers. 32, and the control circuit 20 determines whether to connect to a dedicated line or a public communication network based on the registration information.

The control circuit 20 corresponds to each destination,
The necessary parameters are determined from the communication history, the communication modulation method, the communication baud rate, and the communication speed from the past communication history.
0, and control is performed by referring to these at the time of communication.

FIGS. 3 to 9 show control procedures performed by the control circuit 20 of FIG. The illustrated procedure is stored in the memory circuit 18 in the form of a program of the control circuit 20 or the like.

In FIG. 3, step S0 represents the beginning, and the processing is started from this in response to the reset or power-on of the apparatus.

In step S2, a clear pulse is generated on the signal line 20h, and the display circuit 28 is set to a state in which connection to the dedicated line is not displayed (display without connection to the dedicated line is performed).

In step S4, a signal of signal level "0" is output to the signal line 20a, and the CML relay of the NCU 2 is turned off (the line 2a is connected to the telephone 4).

In step S6, a signal of signal level "0" is output to the signal line 20d, and the ANSam sending circuit 10 does not transmit the ANSam signal.

In step S8, the information of the signal line 24a is inputted, and it is determined whether or not the registration of the characteristic of the telephone number of the leased line is selected. When the registration of the characteristic of the telephone number of the leased line is selected, Proceeding to step S10, registration in the registration circuit 32 is performed via the signal line 32a. For example, the operation unit 24
In response to a predetermined operation from, the characteristics of the telephone number
It is registered in the registration circuit 32 as a digit telephone number, and when the registration of the characteristics of the telephone number of the dedicated line is completed, or if the registration of the characteristics of the telephone number of the dedicated line is not selected in step S8, the process proceeds to step S12.

In step S12, information on the signal line 24a is input, and it is determined whether registration of one-touch dialing or abbreviated dialing has been selected.
The process proceeds to step S14, and if not selected, the process proceeds to step S20.

In step S14, it is determined whether the destination to be registered is a dedicated line destination. This determination can be made by comparing the input telephone number with the telephone number registered in the registration circuit 32.

If the destination to be registered is a dedicated line destination, the process proceeds to step S16, where one-touch dialing and abbreviated dialing are registered in the circuit 30 via the signal line 30a, and the initial value corresponds to the destination. V. 34
And 0 as an initial value of an error counter (described later). On the other hand, if the destination is a public communication network destination, the process proceeds to step S18, where one-touch dialing and abbreviated dialing are registered in the circuit 30 via the signal line 30a. 34, 3429 baud, 33.6 Kb / s as the communication speed, and 0 as the initial value of the error counter.

In step S20 of FIG. 4, the signal line 24a
Is entered, and it is determined whether or not calling is selected.
When selected, the process proceeds to step S24, and when not selected, the process proceeds to step S22 to perform other processing.

In step S24, it is determined whether or not the number of digits of the designated destination telephone number is 4 digits. If the number is 4 digits, the process proceeds to step S26.
Go to 70.

In step S26, information on the signal line 28a is input, and it is determined whether or not the display circuit 28 for connection to the dedicated line is lit. If it is lit, the process proceeds to step S28. Proceed to step S70 (FIG. 7).
The connection to the dedicated line (the lighting state of the display circuit 28) is determined according to the operation of the button 26 as described above.

In step S28, after outputting the telephone number on the signal line 20f, a call command pulse is generated on the signal line 20g, and a call is made to the destination designated by the call circuit 22.

In step S30, a signal of signal level "1" is output to the signal line 20a, and the CML of the NCU 2 is turned on (the line 2a is connected to the hybrid circuit 6).

In step S32, the information of the signal line 30a is inputted, and the communication system registered in the registration circuit 30 corresponding to the designated destination is checked. Here, the communication method registered corresponding to the destination is V. If the value is V.34, the process proceeds to step S34. If it is 17, step S48
(FIG. 5). If it is 29, the process proceeds to step S64 (FIG. 6).

In step S34, V.V. 8 procedures, V.I. 3
4 procedures, V.I. 34 image transmission.

In step S36, a signal of signal level "0" is output to the signal line 20a, the CML relay of the NCU 2 is turned off, and the line 2a is connected to the telephone 4 side.

In step S38, V.V. It is determined whether the communication of the 34 system has succeeded.
The process proceeds to 0, and the error counter of the corresponding destination registered in the registration circuit 30 is cleared. If the error counter fails, the process proceeds to step S42, and the value of the error counter of the corresponding destination registered in the registration circuit 30 is incremented by one.

In step S44 of FIG. 5, it is determined whether or not the error counter of the corresponding destination registered in the circuit 30 has become 3 or more. If the error counter has become 3 or more, the process proceeds to step S46, where the error counter is set via the signal line 30a. V. corresponding to the called destination 17. Register the error counter = 0 in the circuit 30, and if the error counter is less than 3, proceed to step S4 (FIG. 3). That is, in this embodiment, the error counter is reset at 3.

Steps S48 to S48 are for judging the communication system registered in the registration circuit 30 in step S32.
In step S48, a pre-procedure based on this method is used, and in step S50, V.17 is detected. 17
In the image transmission of the system, a post-procedure is performed in step S52.

In step S54, a signal of signal level "0" is output to the signal line 20a, the CML relay of the NCU 2 is turned off, and the line 2a is connected to the telephone 4 side.

In step S56, V.V. It is determined whether or not the communication in step 17 has succeeded.
If not, the process proceeds to step S58 (FIG. 6).

In step S58 of FIG.
Is incremented by one.

In step S60, it is determined whether or not the error counter of the corresponding destination registered in the circuit 30 has become 3 or more. If the error counter becomes 3 or more, the process proceeds to step S62, where the destination that has just been called via the signal line 30a is sent. Corresponding to V. 29,
The error counter = 0 is registered in the registration circuit 30, and if it is less than 3, the process proceeds to step S4.

Steps S64 to S64 are for judging the communication system registered in the registration circuit 30 in step S32.
29 is a process in the case where the N.29 system is detected. In step S64, a pre-procedure based on the system is used. 29,
V. 27ter image transmission, a post-procedure is performed in step S68.

If it is determined in step S26 of FIG. 4 that there is no connection of a dedicated line, the flow shifts to step S70 of FIG. 7 to make a call to the designated destination using the calling circuit 22.

In step S72, a signal of signal level "1" is output to the signal line 20a, the CML relay of the NCU 2 is turned on, and the line 2a is connected to the hybrid circuit 6.

In step S74, information registered for each destination is input to the registration circuit via the signal line 30a.
Check the communication method of the specified destination. If the communication method of the destination specified here is V. If it is 34, step S7
Go to V.6. If it is 17, the process proceeds to step S96 (FIG. 8). If it is 29, the process proceeds to step S64.

V. If 34 is detected, step S7
6 and V.I. 8 procedures, V.I. 34 procedure; 34
Image transmission. At this time, the maximum baud rate and bit rate registered in the registration circuit 30 corresponding to the destination are input, and parameters less than these values are used.

In step S78, a signal of signal level "0" is output to the signal line 20a, the CML relay of the NCU 2 is turned off, and the line 2a is connected to the telephone 4 side.

In step S80, it is determined whether a communication error has occurred. If a communication error has occurred, step S82 is performed.
Then, the value of the error counter of the corresponding destination registered in the registration circuit 30 is incremented by one, and if there is no communication error, the process proceeds to step S40.

In step S82, the value of the error counter of the corresponding destination registered in the registration circuit 30 is incremented by one.

In step S84, it is determined whether or not the value of the error counter of the corresponding destination of the registration circuit 30 is 3 or more. If the value is 3 or more, the process proceeds to step S84, and if it is less than 3, the process proceeds to step S4.

In step S86, the corresponding destination registered in the registration circuit 30 has the lowest baud rate, that is, 2
It is determined whether or not 400 baud is registered. If the answer is affirmative, the process proceeds to step S90 (FIG. 8), and if the answer is negative, the process proceeds to step S88.

In step S88, V.V. The data of the 34 system, the baud rate reduced by one, the maximum transmission speed at this baud rate, and the error counter = 0 are registered in the registration circuit 30 via the signal line 30a corresponding to the destination of the current call.

If it is determined in step S86 that the lowest baud rate, that is, 2400 baud, has been registered in the corresponding destination of the registration circuit 30, the flow advances to step S90 in FIG.

In step S90, it is further determined whether or not 14.4 Kb / s is registered as the bit rate. If the result is an affirmative response, the flow advances to step S92;
A V.V. signal corresponding to the destination that has just been called via the signal line 30a. 1
7, 14.4 Kb / s and error counter = 0 are registered. If step S90 is a negative response, step S44
To the destination that has just been called via the signal line 30a; 34, 2400 baud, the reduced transmission speed (bit rate), and the content of the error counter = 0 are registered in the registration circuit 30. After the end of step S92, the process returns to step S4 (FIG. 3).

In step S74 of FIG. If No. 17 is detected, the process proceeds to Step S96, and Step S9 is performed.
6 is the pre-procedure according to the procedure, and step S98 is V.V. 1
Post-procedure is performed in 7-image transmission and step S100.

After the end of the communication, in step S102, a signal of signal level "0" is output to the signal line 20a, and the NCU 2
Is turned off, and the line 2a is connected to the telephone 4 side.

In step S104, V. 17 communications,
In addition, it is determined whether communication at a transmission speed higher than the transmission speed of the corresponding destination registered in the registration circuit 30 is possible, and if the answer is affirmative, the process proceeds to step S40. If the determination in step S104 is a negative response, the process proceeds to step S106, and the value of the error counter of the corresponding destination registered in the registration circuit 30 is incremented by one.

In step S108 of FIG.
The value of the error counter of the corresponding destination registered in 0 is 3
It is determined whether or not it is above. If it is 3 or more, the process proceeds to step S110.
Proceed to.

In step S110, the corresponding destination registered in the registration circuit 30 is set to a bit rate of 9600b
/ S is registered or not, and 9600b /
If s has been registered, the flow advances to step S114 to correspond to the destination that has just been called via the signal line 30a. 29,
The contents of 9600 b / s and error counter = 0 are registered in the registration circuit 30. If the bit rate 9600b / s is not registered in step S110, step S1
12 and via the signal line 30a, the V.V. 17. Register the transmission speed, error counter = 0, which is one lower than the previous time, in the registration circuit 30.

As described above, when the connection to the dedicated line is set by the selection button 26, the communication is performed when the connection to the dedicated line is selected and when the connection to the public communication network is selected. Change the method of determining the modulation method and communication speed, and determine the communication modulation method as the communication to be started when connecting to a dedicated line, while determine the communication modulation method as the communication to start when connecting to a public communication network. , The communication baud rate and the bit rate are all controlled.

For the dedicated line connection, therefore, the communication modulation method for starting communication is particularly clarified, the communication time is not increased by performing the fallback a plurality of times, and the communication modulation method that is not supported is used. Communication of
Communication is not disabled, and high-speed communication can always be performed reliably.

On the other hand, in communication via a public communication network, the optimum communication system, communication baud rate, and bit rate can be used for each destination from the beginning, so that the advantage of the high-speed communication modulation system (for example, V.34) is obtained. Fine control of each communication destination that is utilized can be performed, and high-speed and reliable communication can always be performed.

In addition, since necessary parameters are determined from the past communication history among communication modulation methods, communication baud rates, and communication speeds corresponding to each destination. In this connection, fallback can be realized with parameters of the communication modulation method, and fallback can be realized with all parameters of the communication modulation method, communication baud rate, and communication speed in connection with a public communication network.

When a 4-digit dial signal is detected, connection to a dedicated line is made. When a 5-digit or more dial signal is detected, connection to a public communication network is made. That is, based on characteristic information of a telephone number connected to the dedicated line. Since it is determined whether to connect to a dedicated line or to a public communication network, connection to the dedicated line and connection to the public communication network can be ensured, and the facsimile machine can also use the dedicated line or public communication. Since the connection to the network can be reliably recognized, the communication method can be finely and appropriately controlled according to the connection network.

[Second Embodiment] The first embodiment employs N
Considering that only one line is accommodated in the CU, the CU is connected to a public communication network and a dedicated line via a CODEC, and the characteristics of the telephone number of the dedicated line are registered in the registration circuit 32.

However, as shown below, it is conceivable to provide a line connected to a dedicated line and a line connected to a public communication network. In this case, corresponding to each destination, registration may be made to include information on whether to use a public communication network or a dedicated line.

FIG. 2 shows a hardware configuration in the case where two lines from the NCU to the PSTN and the CODEC connected to the dedicated line are provided. Here, only portions different from the configuration of the first embodiment (FIG. 1) are shown, and portions similar to those of the first embodiment are omitted.

In FIG. 2, NCU 2 and control circuit 20
Are changed from FIG. Specifically, block 34 is added, and blocks 30 and 32 in FIG. 1 are deleted. Blocks 40, 4
2, 44, 46 and 48 are blocks 50, 52, 54 and 5
6, 58. That is, NCU2 has P
Two lines, a line 2d connected to the STN 56 and a line 2e for connecting to the dedicated line 58 via the CODEC 50 are accommodated.

In FIG. 2, reference numeral 34 substantially corresponds to the registration circuit 30 for each destination in FIG. 1. In the registration circuit 34, the type of the communication network to be used is registered. That is, it corresponds to each destination of one-touch dialing and abbreviated dialing. The type of the destination is a dedicated line or a public communication network, and the communication method used for the destination is the same as that of the registration circuit 30. Registered via line 34a.

Codecs 50 and 52 are codecs 4
Unlike 0 and 42, only communication via the dedicated line 58 is executed.

FIGS. 10 and 11 show the control performed by the control circuit 20. FIG. Here, only different parts from the control of FIGS. 3 to 9 are shown.

FIG. 10 shows the dial registration process. Step S120 in FIG. 10 corresponds to step S6 in FIG.
After the initialization processing up to step S6 in FIG. 3 is completed, the process proceeds to step S122.

In step S122, information on the signal line 24a is input, and it is determined whether registration of one-touch dialing or abbreviated dialing has been selected. If it has been selected, the process proceeds to step S124. If not, step S130 has been performed.
Proceed to (Step S20).

In step S124, select button 26,
It is determined via the display circuit 28 whether or not connection to a dedicated line has been selected. If connection to a dedicated line has been selected, the process proceeds to step S128. In step S128, the one-touch dial and the abbreviated dial are registered in the circuit 34 via the signal line 34a, and the dedicated line is used as a line corresponding to the destination, and the V.V. 34, register that the error counter = 0.

On the other hand, if step S124 is denied, that is, the connection to the public communication network is selected and step S124 is executed.
126, the one-touch dialing and the abbreviated dialing are registered in the circuit 34 via the signal line 34a, and correspond to the destination together with the public communication network as the line to be used and V.V. 34, 3429 baud, 33.6 Kb /
s, register as error counter = 0. Step S12
6. After S128, the process proceeds to step S20 (FIG. 4).

Then, when a call is selected in step S20 of FIG. 4, the process of FIG. 11 is started.

In step S134, information on the signal line 34a is input, and it is determined whether or not the selected destination of the call is a dedicated line. If the destination is a dedicated line, the flow advances to step S136 to establish a connection in the public communication network. If so, the flow advances to step S142 to use the calling circuit 22 to call the line 2d to the designated destination, and then to step S144 (step S72 in FIG. 7).

In step S136, information on the signal line 28a is input, and it is determined whether the display circuit 28 for connection to the dedicated line is lit or not.
Proceeding to step 2, if it is lit, proceed to step S158, use the calling circuit 22, call the line 2e to the designated destination, and proceed to step S140 (step S30 in FIG. 4).

Thereafter, in steps S30 and S144 and thereafter, communication using a public communication network or a dedicated line is executed in the same manner as in the above-described embodiment.

As described above, in a configuration in which two lines are accommodated, one is connected to a public communication network, and one is connected to a dedicated line, the registration circuit 34 stores the type of communication network used for each destination. By registering, it is clear whether connection is to be made using a dedicated line or a public communication network for each destination, an appropriate communication method can be selected in each network, and reliable and high-speed communication can be performed. Become so. Also,
As in the above-described embodiment, the communication modulation method, the communication baud rate, and the communication speed required for each destination are determined from the past communication history, so that when connecting to the dedicated line, the communication modulation corresponding to each destination is performed. It realizes fallback with the parameters of the system, and in connection with the public communication network, it can realize fallback with all parameters of the communication modulation system, communication baud rate, and communication speed, enabling fine-grained communication control .

Note that, as in the first embodiment, CODEC
Even when there is only one line between NCU and NCU, it is conceivable to use a registration circuit such as the registration circuit 34 that stores up to the network type. In this case, the same operation as described above can be performed by appropriately controlling the telephone number transmitted to the CODEC according to the network.

[0102]

As is apparent from the above description, according to the present invention, in a facsimile apparatus connected to a dedicated line and a public communication network, and performing communication using the dedicated line or the public communication network, when a call is made, It employs a configuration having means for detecting whether to connect to the leased line or the public communication network, and control means for selecting an optimal communication method in each of the connection to the leased line and the connection to the public communication network. An excellent facsimile machine that can always use an optimal communication method in a dedicated line and a public communication network without causing unnecessary fallback as in the past, and can always perform reliable and high-speed communication. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a facsimile apparatus employing the present invention.

FIG. 2 is a block diagram showing a configuration of a second embodiment of the facsimile apparatus according to the present invention.

FIG. 3 is a flowchart illustrating communication control by a control circuit 20 of FIG. 1;

FIG. 4 is a flowchart illustrating communication control by a control circuit 20 of FIG. 1;

FIG. 5 is a flowchart illustrating communication control by a control circuit 20 of FIG. 1;

FIG. 6 is a flowchart illustrating communication control by a control circuit 20 of FIG. 1;

FIG. 7 is a flowchart illustrating communication control by a control circuit 20 of FIG. 1;

FIG. 8 is a flowchart illustrating communication control by a control circuit 20 of FIG. 1;

FIG. 9 is a flowchart illustrating communication control by the control circuit 20 of FIG. 1;

FIG. 10 is a flowchart illustrating communication control by a control circuit 20 of FIG. 2;

FIG. 11 is a flowchart illustrating communication control by the control circuit 20 of FIG. 2;

[Explanation of symbols]

 2 NCU 4 Telephone 6 Hybrid circuit 8 Modulator / demodulator 10 ANSam transmission circuit 12 Addition circuit 14 Reading circuit 16 Recording circuit 18 Memory circuit 20 Control circuit 22 Calling circuit 24 Operation unit 26 Dedicated line connection selection button 28 Display circuit with dedicated line connection REFERENCE SIGNS LIST 30 communication method registration circuit 32 dedicated line telephone number characteristic registration circuit 34 communication network and communication method registration circuit 40 CODEC 42 CODEC 44 facsimile device 46 PSTN 48 dedicated line 50 CODEC 52 CODEC 54 facsimile device 56 PSTN 58 dedicated line

Claims (5)

[Claims] 1. A facsimile apparatus connected to a dedicated line and a public communication network and performing communication using the dedicated line or the public communication network, detects whether to connect to the dedicated line or the public communication network when making a call. A facsimile apparatus comprising: a control unit that selects an optimum communication method for each of connection to a dedicated line and connection to a public communication network. 2. A communication system selected for each of the connection to the dedicated line and the connection to the public communication network includes a communication modulation system and an initial value of a communication speed. 2. The facsimile apparatus according to claim 1, wherein communication is controlled in units of a modulation system, and when connected to a public communication network, communication is controlled in all of a communication modulation system, a communication baud rate, and a communication speed. 3. A communication device comprising storage means for storing communication parameters to be used for each destination, determining necessary communication parameters from a communication modulation method, a communication baud rate, and a communication data rate for each destination to be connected, and performing communication. 2. The facsimile apparatus according to claim 1, wherein the storage contents of said storage means are updated with communication parameters used in actual communication every time. 4. The facsimile apparatus according to claim 1, wherein whether to connect to a dedicated line or to a public communication network is determined based on the telephone number of the destination to call. 5. The facsimile apparatus according to claim 3, wherein said storage means stores information for identifying whether to use a public communication network or a dedicated line for each destination.