JP2009188710A - Communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus capable of detecting a call signal without delay even when the head of a ringing signal is displaced toward a negative polarity side, and preventing a telephone set from ringing despite non-ring function validated. <P>SOLUTION: When the LINE voltage of a telephone line 120 is detected to be displaced toward the negative polarity side, a half-wave photo-coupler 108 outputs a CI2 signal indicating the detection of the ringing signal to a power source control CPU 110. Then, when the non-ring function is set to validation, the power source control CPU 110 outputs an SON2 signal to an S relay 106 with the CI2 signal as a trigger. The S relay 106 which receives the SON2 signal is changed from an off-state (a state where a connection line is brought into contact) into an on-state (a state where the connection line is separated). Consequently, a circumscribed telephone 430 is separated from the telephone line 120, thereby attaining non-ringing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication apparatus that receives an image signal and relays an audio signal transmitted / received by a telephone call, and more particularly to a communication apparatus having a power saving mode and a no-sound function.

  2. Description of the Related Art Conventionally, communication apparatuses that perform FAX reception and relay of audio signals transmitted and received by telephone calls have been widely spread. In recent years, communication apparatuses having a power saving mode for waiting for main power-on and a non-ringing function for preventing ringing of a circumscribed telephone are common. Hereinafter, a facsimile apparatus will be described on behalf of such a communication apparatus.

FIG. 4 is a block diagram showing a configuration of a main part of a conventional facsimile apparatus. A conventional facsimile apparatus 400 includes a LINE connector 401, a silicon DAA 402, a modem 403, a main CPU 404, a TEL connector 405, an S relay 406, a half-wave photocoupler 407, an ASIC 408, a power control CPU 409, A power supply unit 410 and a main power supply unit 411 are provided.
An external telephone 430 is connected to the TEL connector 405. A voice signal input from the external telephone 430 is transmitted to the other party's telephone via the facsimile apparatus 400. Thereby, the user can talk with the other party from the external telephone 430.
Also, the silicon DAA 402 determines whether or not there is a calling signal indicating the start of FAX reception based on a signal input from the LINE connector 401. When there is a call signal, the silicon DAA 402 receives a signal (for example, image data) transmitted from the counterpart facsimile machine via the telephone line 420 via the LINE connector 401.

  The upper sections (A) to (C) of FIG. 5 are signal waveforms when the head of the calling signal is displaced to the positive pole side, and the lower sections (A) to (C) of FIG. Is a signal waveform when is displaced to the negative pole side. 5A shows the waveform of a signal input to the half-wave photocoupler 407. FIG. FIG. 5B shows the waveform of the CI signal output from the half-wave photocoupler 407 to the power supply control CPU 409. FIG. 5C shows the waveform of the SON2 signal output from the power control CPU 409 to the S relay 406.

The half-wave photocoupler 407 includes a light emitting diode, a photodiode, and a transistor. Half-wave photocoupler 407 detects that the LINE voltage of telephone line 420 has been displaced to the positive pole side. When the half-wave photocoupler 407 detects that the LINE voltage of the telephone line 420 has shifted to the positive pole side, it outputs a CI signal indicating that the calling signal has been detected to the power supply control CPU 409 (the upper part (A (See (B)). Then, when the silent function is set to be valid, the power supply control CPU 409 outputs the SON2 signal to the S relay 406 using this CI signal as a trigger (see the upper part (C) of FIG. 5). Then, the S relay 406 that has received the SON2 signal changes from an off state (a state where the connection line is in contact as shown in FIG. 4) to an on state (a state where the connection line is separated as shown in FIG. 4). As a result, the external telephone 430 is disconnected from the telephone line 420, so that no ringing is realized.
Japanese Patent Application Laid-Open No. 2004-151867 discloses a communication device that turns on the main power source and shifts to a FAX reception operation without turning on the ringing signal when receiving a FAX calling signal when setting no-sound reception in the power saving mode. It is shown.
Japanese Patent Laid-Open No. 9-36997

However, as shown in the lower part (A) of FIG. 5, when the head of the calling signal is displaced to the negative pole side, the half-wave photocoupler 407 cannot detect the head of the calling signal and the calling signal is on the positive pole side. It detects when it is displaced. That is, the detection of the calling signal is delayed by a half cycle. Half-wave photocoupler 407 then outputs the CI signal to power supply control CPU 409 with a delay of a half period. Therefore, when the power supply control CPU 409 outputs the SON2 signal to the S relay 406 using this CI signal as a trigger (see the lower part (C) of FIG. 5), it is after the head of the calling signal has already been transmitted to the external telephone 430. The circumscribing phone 430 rings.
As described above, in the conventional communication apparatus including the facsimile apparatus 400, the detection of the half-wave photocoupler is delayed by half a wave, so that the external telephone is ringing even though the no ringing function is enabled. There was a problem that.

  The present invention detects the call signal without delay even when the head of the call signal is displaced to the negative pole side, and prevents the telephone from ringing even though the no-sound function is enabled. An object is to provide a communication device.

  The communication device of the present invention has the following configuration in order to solve the above problems.

(1) a first connector connected to a telephone line; a processing unit for processing an image signal transmitted from the telephone line via the first connector; and an audio signal input / output from a receiver. A communication device comprising: a second connector to which a telephone that transmits and receives via a telephone line is connected;
A relay unit that relays the audio signal transmitted through an electric circuit connecting the first connector and the second connector, and opens and closes the electric circuit;
A first detection unit for detecting that a call signal transmitted from the telephone line via the first connector has been displaced to the positive pole side to notify the start of transmission of the image signal;
A second detector for detecting that the calling signal is displaced to the negative pole side;
Of the displacements of the call signal detected by the first and second detection units, the displacement of the call signal detected first is used as a trigger to instruct the relay unit to open the electric circuit, and the telephone is And a power supply control unit that disconnects from the line for a predetermined time.

In this configuration, the communication device is, for example, a facsimile device. The telephone has a handset for receiving and inputting voice signals. The call signal is a signal for synchronizing transmission and reception in data communication. In addition, the communication device achieves silence of the telephone by disconnecting the second connector to which the telephone is connected from the telephone line.
In this configuration, when the head of the calling signal is displaced to the positive pole side, the head is detected by the first detection unit. On the contrary, when the head of the calling signal is displaced to the negative pole side, the head is detected by the second detection unit. Therefore, even when the head of the call signal is displaced to the negative pole side, the call signal can be detected without delay. Therefore, it is possible to prevent the telephone from ringing despite the non-ringing function being enabled.

  (2) Each of the first and second detection units is a photocoupler that outputs a call detection signal indicating that the displacement is detected to the power supply control unit when the displacement of the call signal is detected. It is characterized by being configured.

  This configuration indicates that the element constituting each of the first and second detection units is a photocoupler. The photocoupler includes, for example, a light emitting diode, a photodiode, and a transistor. Therefore, the photocoupler can detect a forward bias call signal, but cannot detect a reverse bias call signal. Therefore, if there is only one photocoupler, only one of the ringing signal whose head is displaced to the positive pole side and the ringing signal whose head is displaced to the negative pole side is the head. It cannot be detected.

(3) The power supply control unit retriggers each time the call detection signal is input from any one of the first and second detection units, and sends an instruction signal to instruct to open the electric circuit. Output to the relay unit until the predetermined time has elapsed,
The relay unit closes the electric circuit when the instruction signal is no longer input from the power control unit.

  In this configuration, the predetermined time is set in advance to a time longer than the ringing signal cycle. For this reason, when a predetermined time has elapsed since the last call detection signal was input to the power supply control unit, there is no instruction from the power supply control unit and the electric circuit of the relay unit is closed, but the call signal has already ended. For this reason, the calling signal is not input to the telephone. Therefore, the telephone can be prevented from ringing.

(4) The power control unit
When the call detection signal is input from any one of the first and second detection units, check whether the input of the call detection signal continues for a predetermined time,
After confirming that the input of the call detection signal has continued for the predetermined time, the relay unit is instructed to open the electric circuit, and the telephone is disconnected from the telephone line for the predetermined time,
It is prohibited to instruct the relay unit to open the electric circuit when the input of the call detection signal does not continue for the predetermined time.

There is a possibility that the signal input from the telephone line to the first and second detection units via the first connector is not a call signal but noise.
Therefore, in this configuration, when the call detection signal is input from one of the first and second detection units, the power supply control unit checks whether the input of the call detection signal continues for a predetermined time. Yes. The predetermined time is set in advance to a time shorter than a half cycle of the calling signal. The predetermined time is 3 ms, for example.
As described above, it is possible to prevent the relay unit from being switched by misunderstanding the noise as a call signal.

  (5) The power supply control unit waits for an input of the call detection signal from the first and second detection units even in a power saving state in which the main power is turned on.

  In this configuration, even in the power saving state, the call signal can be detected without delay when the head of the call signal is displaced to the negative pole side. Therefore, it is possible to prevent the telephone from ringing even in the power saving state when the no ringing function is enabled.

  (6) The processing unit forms an image based on the image signal on a paper medium.

  According to the present invention, there is an effect that it is possible to prevent the telephone from ringing despite the non-ringing function being enabled.

  Hereinafter, a facsimile apparatus according to an embodiment of the present invention will be described.

FIG. 1 is a block diagram showing a configuration of a main part of a facsimile apparatus according to an embodiment of the present invention. The facsimile machine 100 includes a LINE connector 101, a silicon DAA 102, a modem 103, a main CPU 104, a TEL connector 105, an S relay 106, half-wave photocouplers 107 and 108, an ASIC 109, a power control CPU 110, A power supply unit 111, a main power supply unit 112, a printing unit 113, and a scanner 114 are provided.
The facsimile machine 100 relays voice signals transmitted and received by FAX transmission and telephone calls. Further, the facsimile machine 100 has a power saving mode in which the main power is turned on and a non-ringing function for preventing ringing of a circumscribed telephone.

  Here, the LINE connector 101 corresponds to the “first connector” of the present invention. The TEL connector 105 corresponds to the “second connector” of the present invention. The S relay 106 corresponds to the “relay unit” of the present invention. Further, the + pole half-wave photocoupler 107 corresponds to the “first detection unit” of the present invention. The negative-pole half-wave photocoupler 108 corresponds to a “second detection unit” of the present invention. The power control CPU 110 corresponds to the “power control unit” of the present invention. The printing unit 113 corresponds to the “processing unit” of the present invention.

  When the facsimile apparatus 100 is in a power-on state, the main power supply unit 112 takes in drive power from a commercial power supply and supplies power to each part of the facsimile apparatus 100. On the other hand, the main power supply unit 112 stops supplying power to each unit of the facsimile machine 100 when the facsimile machine 100 is in a power saving mode (so-called standby). Instead, the sub power supply unit 111 takes drive power from commercial power and supplies power to the S relay 106 and the power control CPU 110. Here, the external telephone 130 is supplied with a line voltage from any of an AC adapter (not shown) that takes in commercial power, a telephone line 120, or a TEL connector 105.

First, a configuration related to FAX transmission / reception will be described.
A telephone line 120 is connected to the LINE connector 101.
The silicon DAA 102 determines the presence or absence of a call signal indicating the start of FAX reception based on the signal input from the LINE connector 101. The call signal is a signal for synchronizing transmission and reception in data communication. When there is a calling signal, the silicon DAA 102 receives a signal (for example, image data) transmitted from the counterpart facsimile machine via the telephone line 120 via the LINE connector 101. The image data is output to the modem 103, demodulated by the modem 103, and input to the main CPU 104. The main CPU 104 decodes the image data (for example, with a run length code) and prints it on a paper medium by the printing unit 113 based on the decoded data.

  On the other hand, at the time of FAX transmission, the main CPU 104 outputs image data in a built-in memory (not shown) to the modem 103. This image data is image data read in advance by the scanner 114 and stored in the memory. The modem 103 modulates this image data and outputs it to the silicon DAA 102. Then, the silicon DAA 102 transmits the image data to the other party's facsimile machine via the telephone line 120 via the LINE connector 101.

Next, a configuration related to a relay function for voice signals transmitted and received by telephone calls will be described.
The TEL connector 105 is connected to the external telephone 130 provided with a receiver. A voice signal input from the handset of the external telephone 130 is transmitted to the other party's telephone via the facsimile apparatus 100. As a result, the user can talk with the other party on the external telephone 130.
Further, the TEL connector 105 is connected to the S relay 106 for achieving the above-described silent function by an electric circuit. The S relay 106 relays an audio signal transmitted through an electric circuit connecting the LINE connector 101 and the TEL connector 105.

The S relay 106 is normally in an off state (a state in which the connection line is in contact). In response to the SON signal, the S relay 106 is turned on (the connection line is separated as shown).
Note that the ASIC 109 outputs the SON1 signal to the S relay 106 based on the CI signal when the silent function is set to be valid.

  The upper stages (A) to (D) of FIG. 2 are signal waveforms when the head of the call signal is displaced to the positive pole side, and the lower stages (A) to (D) of FIG. Is a signal waveform when is displaced to the negative pole side. 2A shows the waveforms of signals input to the half-wave photocouplers 107 and 108. FIG. (B1) of FIG. 2 shows the waveform of the CI signal output from the half-wave photocoupler 107 to the power supply control CPU 110. (B2) in FIG. 2 shows the waveform of the CI signal output from the half-wave photocoupler 108 to the power supply control CPU 110. FIG. 2C shows the waveform of the SON2 signal output from the power supply control CPU 110 to the S relay 106. FIG. 2D shows the waveform of the return request signal output from the power control CPU 110 to the main power supply unit 112.

The half-wave photocoupler 107 includes a light emitting diode, a photodiode, and a transistor. Therefore, the half-wave photocoupler 107 can detect a forward bias call signal, but cannot detect a reverse bias call signal.
The half-wave photocoupler 107 detects that the LINE voltage of the telephone line 120 has been displaced to the positive pole side. When the half-wave photocoupler 107 detects that the LINE voltage of the telephone line 120 has shifted to the positive pole side, it outputs a CI signal indicating that the calling signal has been detected to the power supply control CPU 110 (upper part (A) in FIG. (See (B1)). Then, when the silent function is set to be valid, the power supply control CPU 110 outputs the SON2 signal to the S relay 106 using this CI signal as a trigger (see the upper part (C) of FIG. 2). Then, the S relay 106 that has received the SON2 signal changes from an off state (a state in which the connection line is in contact) to an on state (a state in which the connection line is separated as shown in FIG. 1). As a result, the circumscribed telephone 430 is disconnected from the telephone line 120, so that no ringing is realized.
The power supply control CPU 110 returns the main power supply unit 112 by a call signal from the telephone line 120 (see FIG. 2D), and shifts from the power saving state to the power on state in which FAX reception is started.

  However, as shown in the lower part (A) of FIG. 2, when the head of the calling signal is displaced to the negative pole side, the half-wave photocoupler 107 cannot detect the head of the calling signal and the calling signal is on the positive pole side. It detects when it is displaced. That is, the detection of the calling signal is delayed by a half cycle. Half-wave photocoupler 107 then outputs the CI signal to power supply control CPU 110 with a delay of a half period. Therefore, when the power supply control CPU 110 outputs the SON2 signal to the S relay 106 using this CI signal as a trigger, the head of the calling signal has already been transmitted to the external telephone 130, and the external telephone 130 rings.

  Therefore, in the present embodiment, a half-wave photocoupler 108 that detects that the calling signal is displaced to the negative pole side is provided. Specifically, the configuration is as follows.

  Half-wave photocoupler 108 includes a light emitting diode, a photodiode, and a transistor. When the half-wave photocoupler 108 detects that the LINE voltage of the telephone line 120 has shifted to the negative pole side, it outputs a CI2 signal indicating that the calling signal has been detected to the power supply control CPU 110 (the lower part (A) in FIG. (See (B2)). Then, when the silence function is set to be valid, the power supply control CPU 110 outputs the SON2 signal to the S relay 106 using the CI2 signal as a trigger (see the upper part (C) of FIG. 2). When the S relay 106 receives the SON2 signal, the S relay 106 changes from an off state (a state where the connection line is in contact as shown in FIG. 1) to an on state (a state where the connection line is separated as shown in FIG. 1). As a result, the circumscribed telephone 430 is disconnected from the telephone line 120, so that no ringing is realized.

From the above, even if the head of the call signal is displaced to the negative pole side, the call signal is detected without delay, so the external telephone rings even though the ringing function is enabled. Can be prevented.
Further, since power is supplied to the S relay 106 and the power control CPU 110 even in the power saving state, the call signal can be detected without delay even when the head of the call signal is displaced to the negative pole side even in the power saving state. . Therefore, it is possible to prevent the circumscribed telephone 130 from ringing even in the power saving state when the no ringing function is enabled.

  The power supply control CPU 110 preferentially processes the first input signal among the CI signal and the CI2 signal, ignores the signal input later, and masks the signal interruption. For example, when the first input signal is the CI2 signal, the power supply control CPU 110 retriggers every time the CI2 signal is input from the negative-pole half-wave photocoupler 108, and the CI2 signal is input. The SON2 signal is continuously output to the S relay 106 until a certain time (for example, 140 ms) elapses (see (B2) in FIG. 2). For a certain period of time, a timer circuit (not shown) is provided inside the power supply control CPU 110, and the timer circuit measures the time. The predetermined time is set in advance to a time longer than the ringing signal cycle. Therefore, when a certain period of time has elapsed since the last CI2 signal was input to the power supply control CPU 110, the output of the SON2 signal is completed and the S relay 106 is restored, but the calling signal has already ended. Therefore, the calling signal is not input to the external telephone 130. Therefore, the circumscribed telephone 130 can be prevented from ringing.

  Moreover, the following modifications can be employed in the embodiment of the present invention.

  FIG. 3 is a diagram illustrating an example of a call signal confirmation operation performed by the power supply control CPU 110. FIG. 3A shows the waveform of the CI signal output from the half-wave photocoupler 107 or the half-wave photocoupler 108 to the power supply control CPU 110. FIG. 3B shows a waveform of a signal handled inside the power supply control unit CPU110. FIG. 3C shows the waveform of the SON2 signal output from the power supply control CPU 110 to the S relay 106.

There is a possibility that signals input from the telephone line 120 to the half-wave photocouplers 107 and 108 via the LINE connector 101 are noises instead of ringing signals.
Therefore, when the CI signal (or CI2 signal) is input from one of the half-wave photocouplers 107 and 108, the power supply control unit CPU 110 checks whether the input of the CI signal (or CI2 signal) continues for a predetermined time. To do. The predetermined time is set in advance to a time shorter than a half cycle of the calling signal. The predetermined time is 3 ms, for example. In FIG. 3A, the power supply control unit CPU 110 senses and confirms the CI signal three times at intervals of 1 ms.
Then, after confirming that the input of the CI signal has continued for a predetermined time, the power supply control unit CPU 110 sets a CI confirmation flag indicating that the calling signal is appropriate, and disconnects the TEL connector 105 from the telephone line 120. The relay 106 is instructed (see FIGS. 3B and 3C). Then, the power supply control unit CPU 110 prohibits the output of the SON2 signal to the S relay 106 when the input of the CI signal does not continue for a predetermined time.
As described above, it is possible to prevent the S relay 106 from being switched to an ON state (a state where the connection line is separated) by misunderstanding noise as a calling signal.

1 is a block diagram showing a configuration of a main part of a facsimile apparatus according to an embodiment of the present invention. The figure which shows the waveform of the signal input / output to each part of the facsimile apparatus 100 The figure which shows an example of the confirmation operation of the calling signal performed with the power supply control CPU110 Block diagram showing the configuration of the main part of a conventional facsimile machine The figure which shows the waveform of the signal input / output to each part of the facsimile apparatus 400

Explanation of symbols

100-facsimile machine 101-LINE connector 102-silicon DAA
103-modem 104-main CPU
105-TEL connector 107, 108-half wave photocoupler 109-ASIC
110-Power control CPU
111-sub power supply unit 112-main power supply unit 113-printing unit 114-scanner 120-telephone line 130-external telephone 400-facsimile device 402-silicon DAA
403-Modem 404-Main CPU
405-TEL connector 406-S relay 407-half wave photocoupler 408-ASIC
409—Power control CPU
410-sub power supply unit 411-main power supply unit 420-telephone line 430-external telephone

Claims (6)

A first connector connected to the telephone line; a processing unit for processing an image signal transmitted from the telephone line via the first connector; and an audio signal input / output from a receiver through the telephone line. A communication device comprising: a second connector to which a telephone that transmits and receives data is connected;
A relay unit that relays the audio signal transmitted through an electric circuit connecting the first connector and the second connector, and opens and closes the electric circuit;
A first detection unit for detecting that a call signal transmitted from the telephone line via the first connector has been displaced to the positive pole side to notify the start of transmission of the image signal;
A second detector for detecting that the calling signal is displaced to the negative pole side;
Of the displacements of the call signal detected by the first and second detection units, the displacement of the call signal detected first is used as a trigger to instruct the relay unit to open the electric circuit, and the telephone is And a power control unit that disconnects from the line for a predetermined time.   Each of the first and second detection units includes a photocoupler that outputs a call detection signal indicating that the displacement is detected to the power supply control unit when the displacement of the call signal is detected. The communication apparatus according to claim 1. The power control unit retriggers each time the call detection signal is input from one of the first and second detection units, and outputs an instruction signal to instruct to open the electric circuit for the predetermined time. Is output to the relay unit until
The communication device according to claim 2, wherein the relay unit closes the electric circuit when the instruction signal is no longer input from the power supply control unit. The power control unit
When the call detection signal is input from any one of the first and second detection units, check whether the input of the call detection signal continues for a predetermined time,
After confirming that the input of the call detection signal has continued for the predetermined time, the relay unit is instructed to open the electric circuit, and the telephone is disconnected from the telephone line for the predetermined time,
4. The communication device according to claim 2, wherein when the input of the call detection signal does not continue for the predetermined time, it is prohibited to instruct the relay unit to open the electric circuit.   5. The communication device according to claim 2, wherein the power control unit waits for an input of the call detection signal from the first and second detection units even in a power saving state in which the main power is turned on.   The communication apparatus according to claim 1, wherein the processing unit forms an image based on the image signal on a paper medium.

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