Communication apparatus for selecting a communication protocol compatible to a partner station and executing the selected protocol

This application is a continuation of application Ser. No. 08/395,588 filed on Feb. 28, 1995, abandoned.

1. Field of the Invention

The present invention relates to a communication apparatus which selects a communication protocol compatible to a partner station and executing the selected protocol.

2. Related Background Art

In prior art apparatus of this type, a facsimile apparatus is known. The communication protocol of the facsimile apparatus includes G1, G2, G3 and G4 protocols. The G4 protocol uses a digital line and the G1, G2 and G3 protocols use an analog public line. In connecting a line to a communication partner station, the facsimile apparatus sequentially sends the G3 protocol, the G2 protocol and the G1 protocol and determines which protocol is to be executed in accordance with the presence or absence of acknowledge signals to the respective sent signals.

However, in the above facsimile apparatus, the G3 protocol, the G2 protocol and the G1 protocol are sequentially sent and the presence or absence of the acknowledge signal thereto is checked. Accordingly, a long time is required before the communication protocol to be executed is determined.

When a new communication protocol is added to the above protocols, a longer time is required before the communication protocol is determined. Where signals are to be sent and received to and from the partner station, if the reception of the signal is unsuccessful, a protocol of a lower function is selected even if the partner station actually has a protocol of a higher function.

Information on the communication function of the partner station may be registered, together with a telephone number of the partner station, in a one-touch dial key or an abbreviated dial key. Thus, when a call is made by depressing the dial key, the communication mode is selected in accordance with the registered information of the communication function (U.S. Pat. No. 4,910,506).

However, in the above U.S. Pat. No. 4,910,506, the information of the communication function registered in the one touch key is not useful for a received call.

It is an object of the present invention to provide an improved communication apparatus in the light of the above problems.

It is another object of the present invention to provide a communication apparatus which can rapidly determine a proper communication protocol at the reception of a call in accordance with a partner or calling station.

Other objects of the present invention will be apparent from the following detailed description and drawings of the preferred embodiments.

FIG. 1 is composed of FIGS. 1A and 1B and is a block diagram of a configuration of a facsimile apparatus according to the invention,

FIG. 2 is a flow chart of the control steps of a control circuit 54 of FIG. 1B ,

FIG. 3 is a flow chart of the control steps of the control circuit 54 of FIG. 1B ,

FIG. 4 is a flow chart of the control steps of the control circuit 54 of FIG. 1B ,

FIG. 5 is a flow chart of the control steps of the control circuit 54 of FIG. 1B ,

FIG. 6 is a flow chart of the control steps of the control circuit 54 of FIG. 1B ,

FIG. 7 is a flow chart of the control steps of the control circuit 54 of FIG. 1B , and

FIG. 8 is a flow chart of the control steps of the control circuit 54 of FIG. 1 B.

[Embodiment 1]

FIGS. 1A and 1B comprise a block diagram of an embodiment of a facsimile apparatus of the present invention.

In FIGS. 1A and 1B , numeral 2 denotes a CML relay which connects a telephone line (signal lines 2 a , 2 b ) to a facsimile communication unit (signal lines 14 a , 14 b ) when a signal level ‘1’ is outputted to a signal line 54 a , and connects the telephone line (signal lines 2 a , 2 b ) to a telephone set (signal lines 10 a , 10 b ) when a signal level ‘0’ is outputted to the signal line 54 a.

Numeral 4 denotes a TEL relay for detecting non-ringing call reception and an off-hook state during communication. It connects signal lines 6 a , 6 b to the signal lines 10 a , 10 b when the signal level ‘1’ is outputted to a signal line 54 b , and connects the signal lines 6 a , 6 b to signal lines 8 a , 8 b when the signal level ‘0’ is outputted to the signal line 54 b . When the signal level ‘0’ is outputted to the signal line 54 b , an off-hook detection circuit 8 determines whether the telephone set is in the off-hook state or not, and if it is in the off-hook state, it outputs the signal level ‘0’ to a signal line 8 c.

Numeral 6 denotes a telephone set.

Numeral 10 denotes a call signal detection circuit which receives the signals on the signal lines 10 a and 10 b , and outputs the signal level ‘1’ to the signal line 10 a when it detects a call signal and outputs the signal level ‘0’ to the signal line 10 a when it does not detect the call signal.

Numeral 12 denotes a circuit for detecting telephone number information sent between the call signals. It outputs the detected telephone number information to a signal line 12 a.

Numeral 14 denotes a hybrid circuit for separating a transmission signal from a reception signal. Namely, the transmission signal on a signal line 30 a is sent to the telephone line through signal lines 14 a , 14 b and the CML relay 2 . A signal sent from the other station is outputted to a signal line 14 c through the CML relay 2 and the signal lines 14 a , 14 b.

Numeral 16 denotes a modulator for modulating a signal in accordance with the CCITT Recommendation V.21. The modulator 16 receives a protocol signal on a signal line 54 c , modulates it and outputs the modulated data to a signal line 16 a.

Numeral 18 denotes a modulator for modulating a signal in accordance with the CCITT Recommendation V.8. The modulator 18 receives a protocol signal on a signal line 54 d , modulates it and outputs the modulated data to a signal line 18 a.

Numeral 20 denotes a Q·PSK modulator for a protocol between image transmission pages by using a V.34 high speed modem. The modulator 20 receives a protocol signal on the signal line 54 e , modulates it and outputs the modulated data to a signal line 20 a.

Numeral 22 denotes a read circuit which sequentially reads one line of image signal along a main scan direction from a transmission document sheet to generate a signal train representing black and white binary signals. It comprises an image pickup device such as a CCD (charge coupled device) and an optical system. The black and white binary signal train is outputted to a signal line 22 a.

Numeral 24 denotes an encoder which receives the read data outputted to the signal line 22 a and outputs encoded data (MH (modified Huffmann) encoded, MR (modified READ) encoded or MMR (modified modified READ) encoded data) to a signal line 24 a.

Numeral 26 denotes a modulator which modulates a signal in accordance with the known CCITT Recommendation V.27 ter (differential phase modulation), V.29 (quadrature modulation) or V.17. The modulator 26 receives the signal on the signal line 24 a when the signal level ‘1’ is outputted to a signal line 54 f , modulates it and outputs the modulated data to a signal line 26 a . The modulator 26 does nothing when the signal level ‘0’ is outputted to the signal line 54 f.

Numeral 28 denotes a modulator which modulates a signal in accordance with the CCITT Recommendation V.34. When the signal level ‘1’ is outputted to a signal line 54 g , the modulator 28 receives the signal on the signal line 24 a , modulates it and outputs the modulated data to a signal line 28 a . The modulator 28 does nothing when the signal level ‘0’ is outputted to the signal line 54 g.

Numeral 30 denotes an adder circuit which receives the signals on the signal lines 16 a , 18 a , 20 a , 26 a and 28 a and outputs a sum signal to a signal line 30 a.

Numeral 32 denotes a demodulator which demodulates a signal in accordance with the known CCITT Recommendation V.21. The demodulator 32 receives the signal on a signal line 14 c , demodulates it and outputs the demodulated data to a signal line 32 a.

Numeral 34 denotes a demodulator which demodulates a signal in accordance with the CCITT Recommendation V.8. The demodulator 34 receives the signal on the signal line 14 c , demodulates it and outputs the demodulated data to a signal line 34 a.

Numeral 36 denotes a Q·PSK demodulator for the protocol between image transmission pages using the CCITT Recommendation V.34 high speed modem. The demodulator 36 receives the signal on the signal line 14 c , Q·PSK demodulates it and outputs the demodulated data to a signal line 36 a.

Numeral 38 denotes a demodulator which demodulates a signal in accordance with the known CCITT Recommendation V.27 ter (phase difference modulation), V.29 (quadrature modulation) or V.17. The demodulator 38 receives the signal on the signal line 14 c , demodulates it and outputs the demodulated data to a signal line 38 a.

Numeral 40 denotes a demodulator which demodulates a signal in accordance with the CCITT Recommendation V.34. The demodulator 40 receives the signal on the signal line 14 c , demodulates it and outputs the demodulated data to a signal line 40 a.

Numeral 42 denotes a decoder circuit which receives the signal outputted to the signal line 38 a when the signal level ‘0’ is outputted to a signal line 54 h , receives the signal outputted to the signal line 40 a when the signal level ‘1’ is outputted to the signal line 54 h , and outputs encoded data (MH (modified Huffmann) encoded, MR (modified READ) encoded or MMR (modified modified READ) encoded data) to a signal line 42 a.

Numeral 44 denotes a record circuit which receives the data outputted to the signal line 42 a and sequentially records it one line at a time.

Numeral 46 denotes a circuit which stores communication systems (particularly, the communication systems in accordance with V.21, V.27 ter, V.29 and V.17 or the communication systems in accordance with V.8 and V.34) in association with a telephone number of a transmit station (copartner or calling station) sent between call signals.

Numeral 48 denotes a circuit which stores the data of registration of the communication system through a signal line 48 a in association with the telephone number of the calling station sent between call signals.

Numeral 50 denotes a circuit which counts the number of times of communication (reception) after the registration of the communication system through a signal line 50 a in association with the telephone number of the calling station sent between call signals.

Numeral 52 denotes a console unit having a registration button used to store the communication system in association with the telephone number of the calling station sent between call signals, a ten-key, one-touch dial keys, abbreviation dial keys, a sent key, a start key and other function keys. The information corresponding to the depressed key is outputted to a signal line 52 a.

Numeral 54 denotes a control circuit which, in the facsimile apparatus capable of detecting the telephone number information sent between call signals, has means for storing the information of the communication system for the calling station in accordance with the telephone number information and call signal detection means and primarily controls the start of the communication by the stored communication system in accordance with the telephone number information sent between call signals when the call signal is detected. The communication systems may be the communication systems based on V.21, V.27 ter, V.29 and V.17 or the communication systems based on V.8 and V.34.

FIGS. 2 and 3 are flow charts of the control steps of the control circuit 54 . The circuits 48 and 50 are not used here.

In FIG. 2 , a step S 60 represents the start.

In a step S 62 , the signal level ‘0’ is outputted to the signal line 54 a to turn of the CML relay 2 , that is, connect the signal lines 2 a and 2 b to the signal lines 10 a and 10 b.

In a step S 64 , the signal level ‘0’ is outputted to the signal line 54 b to turn off the TEL relay 4 , that is, connect the signal lines 6 a and 6 b to the signal lines 8 a and 8 b.

In a step S 66 , the signal level ‘0’ is outputted to the signal line 54 f to set a state which does not use the V.27 ter, V.29 or V.17 modulator 26 .

In a step S 68 , the signal level ‘1’ is outputted to the signal line 54 g to set a state which uses the V.34 modulator 28 .

In a step S 70 , the signal level ‘1’ is outputted to the signal line 54 h to set a state in which decoder circuit 42 receives the signal on the signal line 40 a.

In a step S 72 , whether the registration of the communication system in association with the telephone number between call signals has been selected or not is determined, and if the registration has been selected, the process proceeds to a step S 74 to register the communication system (the first communication system based on V.21, V.27 ter, V.29 and V.17 or the second communication system based on V.8 and V.34) in association with the telephone number of the call signal to the circuit 46 , and if the registration has not been selected, the process proceeds to a step S 76 .

In the step S 76 , the information on the signal line 10 a is received and whether the call signal has been detected or not is determined. If the call signal has been detected, the process proceeds to a step S 80 , and if the call signal has not been detected, the process proceeds to a step S 78 to execute other processes.

In the step S 80 , the information of the circuit 46 is checked to determine whether the telephone number between call signals is for the first communication system based on V.21, V.27 ter, V.29 and V.17, and if it is for the first communication system based on V.21, V.27 ter, V.29 and V.17, the process proceeds to a step S 82 , and if it is for the second communication system based on V.8 and V.34, the process proceeds to a step S 96 .

In the step S 82 , the signal level ‘1’ is outputted to the signal line 54 f to set a state which uses the V.27 ter, V.29 or V.17 modulator 26 .

In the step S 84 , the signal level ‘0’ is outputted to the signal line 54 g to set a state which does not use the V.34 modulator 28 .

In a step S 86 , the signal level ‘0’ is outputted to the signal line 54 h to set a state in which the decoder circuit 42 receives the information on the signal line 38 a.

In a step S 88 of FIG. 3 , the signal level ‘1’ is outputted to the signal line 54 a to turn on the CML relay 2 .

A step S 90 represents a pre-protocol based on V.21.

A step S 92 executes image transmission in accordance with V.27 ter, V.29 or V.17.

A step S 94 executes a post protocol based on V.21.

In a step S 96 , the signal level ‘1’ is outputted to the signal line 54 a to turn on the CML relay 2 .

A step S 98 executes a pre-protocol based on V.8.

A step S 100 executes image transmission in accordance with V.34. A Q·PSK protocol is executed between pages.

A step S 102 executes a post protocol in accordance with Q·PSK.

In accordance with the Embodiment 1, the communication system information of the calling station is stored in the memory circuit 46 in association with the telephone number between call signals which allows the identification of the telephone number of the calling station prior to the line connection, the telephone number between call signals is detected before the line connection, the communication system information of the calling station for the detected telephone number is read from the memory circuit 46 , the communication system information of its own apparatus is set to be compatible to the communication system information of the calling station before the line connection, and the communication is started. Thus, in the apparatus having a plurality of totally different communication systems such as the communication system based on V.27 ter, V.29 and V.17 and the communication system based on V.34, the pre-protocol with the calling station can be shortened and the communication cost can be reduced. (In apparatus having totally different communication systems, normally, the predetermined pre-protocols are sequentially executed for each communication system to detect the communication system of the calling station, and the pre-protocol time is long.)

Further, a chance to misrecognize the communication system of the calling station is reduced.

[Embodiment 2]

In the above embodiment, when the detected telephone number between call signals is not registered in the circuit 46 , or when the telephone number is not sent between call signals, the pre-protocol based on V.8 may be executed and the image transmission by V.27 ter, V.29 or V.17 or the image transmission by V.34 may be determined in accordance with the ability of the calling station.

A specific example of the above control is shown in FIG. 4 for those portions which are different from the flow charts of FIGS. 2 and 3 .

In the decision in the step S 76 of FIG. 2 is YES, the process proceeds to a step S 112 .

In the step S 112 , the information on the signal line 12 a is received and whether the telephone number is present between call signals and the detected telephone number is registered in the circuit 46 or not is determined. If YES, the process proceeds to the step S 80 of FIG. 2 , and if NO, the process proceeds to a step S 116 .

In a step S 116 , the signal level ‘1’ is outputted to the signal line 54 a to turn on the CML relay 2 , that is, connect the signal lines 2 a and 2 b to the signal lines 14 a and 14 b.

A step S 118 executes a pre-protocol based on V.8. The communication system of the calling station is determined based on the signal received in the V.8 pre-protocol.

In a step S 120 , whether the V.34 function is equipped or not is determined. If it is equipped, the process proceeds to the step S 100 of FIG. 3 to execute the image transmission by V.34, and if it is not equipped, the process proceeds to the step S 82 of FIG. 2 .

In acccordance with the Embodiment 2, if the telephone number between call signals is not sent or the telephone number of the calling station is not registered, the communication by V.8 is executed so that the communication can be shifted to any communication system. Thus, a case in which the communication with the calling station is not established because the communication system is not identified before the line connection is avoided.

[Embodiment 3]

In the above embodiment, when a call is received from the telephone number between call signals for the first time, the communication may be executed by the communication system which allows any communication system because the mode of the calling station is not known, and that communication system information is stored, and when a predetermined time is elapsed or a predetermined call reception circuit operates, the communication system information is again determined for the same calling station and it is stored.

A specific example of the above control is shown in FIGS. 5 and 6 for those portions which are different from the flow charts of FIGS. 2 and 3 .

When the decision in the step S 76 of FIG. 2 is YES, the process proceeds to a step S 132 .

In the step S 132 , the information on the signal line 12 a is received and whether the telephone number between call signals is sent or not is determined. If it is sent, the process proceeds to a step S 136 , and if it is not sent, the process proceeds to the step S 116 of FIG. 4 .

In the step S 136 , whether the telephone number between call signals is registered in the circuit 46 or not is determined. If it is registered, the process proceeds to a step S 152 , and if it is not registered, the process proceeds to a step S 138 .

In the step S 138 , the signal level ‘1’ is outputted to the signal line 54 a to turn on the CML relay 2 , that is, connect the signal lines 2 a and 2 b to the signal lines 14 a and 14 b.

A step S 140 executes a pre-protocol based on V.8. In the V.8 pre-protocol, the communication system of the calling station is determined.

In a step S 142 , whether the V.34 function is equipped or not is determined, and if it is equipped, the process proceeds to a step S 144 . If it is not equipped, the process proceeds to a step S 146 .

In the step S 144 , the communication system by V.8 or V.34 in association with the detected telephone number between call signals is registered.

In the step S 146 , the communication system by V.21, V.27 ter, V.29 or V.17 in association with the detected telephone number between call signals is registered in the circuit 46 .

In a step S 148 , the date of registration in association with the detected telephone number between call signals is stored in the circuit 48 and a reception counter in the circuit 50 is cleared. Then, the process proceeds to the step S 80 of FIG. 3 .

In a step S 152 of FIG. 6 , the information in the circuit 48 is read to determine whether the telephone number between call signals has elapsed one half year from the registration date or not. If it has, the process proceeds to a step S 138 , and if it has not, the process proceeds to a step S 154 .

In the step S 154 , the information in the circuit 50 is read to determine whether the telephone number between call signals has been received over 200 time or not. If it has, the process proceeds to a step S 138 , and if it has not, the process proceeds to a step S 156 .

In the step S 156 , the reception counter is incremented by one in association with the detected telephone number between call signals and it is registered in the circuit 50 . Then, the process proceeds to the step S 80 of FIG. 2 .

The process proceeds from the step S 70 of FIG. 2 to the step S 76 of FIG. 2 and the steps S 72 and S 74 are not executed.

In accordance with the Embodiment 4, the communication system by V.8 which permits the shift to any communication system is set for the first communicating calling station to prevent the occurrence of communication error due to incompatibility of the communication system with the calling station at the first communication.

Further, since the communication system information which resulted in the successful communication with the calling station is stored in association with the telephone number of the calling station, the communication system can be established before the line connection at the next communication with that calling station and the pre-protocol time is shortened and the communication cost is reduced.

[Embodiment 4]

In the Embodiment 3, when calling is selected for the telephone number information having the communication system information of the calling station stored in association with the telephone number information between call signals, that communication system information may be stored.

A specific example of the above control is shown in FIG. 7 for those portions which are different from the control flow charts of FIGS. 5 and 6 .

In the Embodiment 4, the process proceeds from the step S 78 of FIG. 2 to a step S 166 .

In the step S 166 , whether calling has been selected or not is determined. If it has been selected, the process proceeds to a step S 168 , and if it has not been selected, the process proceeds to the step S 62 of FIG. 2 .

In the step S 168 , a designated station is called.

In a step S 170 , the signal level ‘1’ is outputted to the signal line 54 a to turn on the CML relay 2 .

In a step S 172 , whether the designated station is registered in the circuit 46 or not is determined. If it is registered, the process proceeds to a step S 174 , and if it is not registered, the process proceeds to a step S 192 .

The step S 174 executes a pre-protocol. When the V.8 pre-protocol signal from a called station is to be detected, the V.8 pre-protocol is executed, and when the V.21 protocol signal from the called station is to be detected, the V.21 pre-protocol is executed.

In a step S 176 , the image transmission is executed. The image is transmitted by the communication system (V.27 ter, V.29. V.17 or V.34) determined in the pre-protocol.

A step S 178 executes a post protocol.

In a step S 180 , the signal level ‘0’ is outputted to the signal line 54 a to turn off the CML relay 2 .

In a step S 182 , whether the image transmission was by V.34 or not is determined, and if it was, the process proceeds to a step S 184 , and if it was by V.27 ter, V.29 or V.17, the process proceeds to a step S 186 .

The step S 184 is same as the step S 144 of FIG. 5 , the step S 186 is same as the step S 146 of FIG. 5 , and the step S 188 is same as the step S 148 of FIG. 5 . The process proceeds from the step S 188 to the step S 62 of FIG. 2 .

In accordance with the Embodiment 4, when the call is made to the station registered in the circuit 46 , the communication system information used for the communication is stored in the circuit 46 in association with the communicated station after the completion of the communication. Thus, the content of the circuit 46 is updated at the transmission and the calling station can rapidly conform to the change of function by the updating of the called station.

[Embodiment 5]

In the Embodiment 4, when the call is selected, the communication system information may be stored even for the telephone number information having the communication system information of the called station not stored, in accordance with the telephone number information between call signals.

A specific example of the above control is shown in FIG. 8 for those portions which are different from the control flow chart of FIG. 7 .

The process proceeds from the step S 170 of FIG. 7 to a step S 174 .

In accordance with the Embodiment 5, when the call is made to the station not having information stored in the circuit 46 , the communication system information used in the communication with the called station is stored in association with the telephone number information of the called station after the completion of the communication. Thus, once called, the communication system information is automatically stored in the circuit 46 and an operator time is saved.

In the embodiments described above, as the communication system information (communication protocol) which is previously stored in association with the telephone number of the calling station received at the time of reception of call, V.21, V.27 ter, V.29 and V.17 (G3 T.30 protocol) and V.8 and V.34 (high speed protocol) have been discussed. However, the protocols to be registered are not limited to those but the protocols of G1, G2, G3, G4, V.8 and V.34 may be added, or the communication protocols of teletex, telex and computer communication in addition to the facsimile apparatus may be added.

It should be understood that the present invention is not limited to the above embodiments and that various modifications may be made.