JP2014064157A - Ringer control circuit, ringer control method, and facsimile machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both non-ringing of an external telephone set when facsimile is received and reduction in a power consumption amount.SOLUTION: A ringer control circuit comprises: a clip circuit that clips the voltage level of a ringer signal arriving from a telephone line to a range in which an externally equipped telephone set does not ring; a ringer circuit that generates a pseudo ringer signal to ring the externally equipped telephone set; a first relay circuit that connects the telephone line and the externally equipped telephone set in a non-conductive state, connects the ringer circuit and the externally equipped telephone set in a conductive state, and is the non-conductive state during a waiting period; and control means that, after the ringer signal is received from the telephone line, determines whether communication following the ringer signal is telephone or facsimile, when it is telephone, shifts the first relay circuit to the conductive state and causes the ringer circuit to generate the pseudo ringer signal and, when it is facsimile, keeps the first relay circuit in non-conductive state.

Description

  The present invention relates to a ringer control circuit, a ringer control method, and a facsimile apparatus.

  Conventionally, a facsimile apparatus including a ringer circuit for ringing an external telephone is known (for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-130312

When the facsimile apparatus includes a ringer circuit, for example, as shown in FIG. 8, the ringer circuit and the telephone line can be switched by a relay circuit (Ry1) as a connection destination of an external telephone. In the case of the first specification that does not ring an external telephone when a call is received but does not ring an external telephone when a facsimile is received (for example, a model in Japan), the relay circuit is a ringer circuit during the standby period. An external telephone is connected (see FIG. 8A). Then, after receiving the ringer signal from the telephone line, the facsimile apparatus performs a facsimile reception operation when it is determined that the facsimile is received. When it is determined that the incoming call has arrived, the facsimile apparatus causes the external telephone to ring by the ringer circuit, and when the off-hook of the external telephone is detected, the relay circuit is switched to connect the telephone line and the external telephone. When the on-hook (call end) of the external telephone is detected, the facsimile apparatus returns the relay circuit to connect the ringer circuit and the external telephone.
On the other hand, in the case of the second specification (for example, a model outside Japan) that rings an external telephone when receiving an incoming call, a relay circuit is always in a state where the telephone line and the external telephone are connected (FIG. 8B). See). In the case of the second specification, the ringer circuit is not necessary, and therefore the ringer circuit may not be mounted. The ringer signal coming from the telephone line rings the external telephone both in the case of telephone and facsimile. When the user picks up the handset of the external telephone and hears the facsimile sound, the facsimile apparatus performs a facsimile reception operation according to the user's instruction, and when the user cannot hear the facsimile sound, the user talks as it is.

In order to reduce development costs, it is desirable to have a common circuit board even if the specifications are different. However, as described above, the default state of the relay circuit (the state in the standby period) differs between the first specification and the second specification. The configuration in which the relay circuit is energized in the default state (current is passed through the coil inside the relay) consumes more power than the configuration in which the relay circuit is not energized in the default state. If the model that uses the second specification has more units shipped than the model that uses the first specification, the circuit board is configured so that the relay circuit is not energized in the default state for the model that uses the second specification. The To reduce costs, the model that uses the first specification uses the same circuit board as the model that uses the second specification. Must be energized (see FIG. 8A). As a result, there is a problem that the first specification model consumes more power than the second specification model.
The present invention has been made in view of the above problems, and an object of the present invention is to achieve both of not ringing an external telephone and reducing power consumption in the case of facsimile reception.

  A ringer control circuit for achieving the above object includes a clip circuit, a ringer circuit, a first relay circuit, and a control means. The clip circuit clips the voltage level of the ringer signal coming from the telephone line in a range where the external telephone does not ring. The ringer signal is a calling signal for ringing the telephone. The ringer circuit generates a pseudo ringer signal that rings an external telephone. The pseudo ringer signal is a signal for ringing the telephone in the same manner as the ringer signal coming from the telephone line. The first relay circuit connects the telephone line and the external telephone in the non-energized state, and connects the ringer circuit and the external telephone in the energized state. The first relay circuit is in a non-energized state during the standby period. In this specification, the standby period means a period during which telephone communication or facsimile communication is not performed. After receiving the ringer signal from the telephone line, the control means determines whether the communication following the ringer signal is a telephone or a facsimile. In the case of a telephone, the first relay circuit is energized to simulate the ringer circuit. A ringer signal is generated, and in the case of facsimile, the first relay circuit is left in a non-energized state.

  In the case of the present invention, after receiving the ringer signal, the first relay circuit is energized in the case of a telephone, and in the case of a facsimile, the first relay circuit is kept in an unenergized state. Since the first relay circuit is not energized during periods other than the period during which the telephone rings (eg, standby period, facsimile reception period, etc.), power consumption is compared to a configuration in which the first relay circuit is energized during the standby period. The amount can be reduced. Also, during the standby period, the telephone line and the external telephone are connected by the first relay circuit, but even if a ringer signal arrives from the telephone line, the clipper circuit clips the ringer signal to the extent that the external telephone does not ring. Therefore, the external telephone does not ring due to the ringer signal regardless of whether it is a facsimile or a telephone. Therefore, according to the present invention, in the case of facsimile reception, it is possible to satisfy both of not ringing an external telephone and reducing power consumption. In the case of a telephone, an external telephone is not ringed by a ringer signal, but an external telephone can be ringed by a pseudo ringer signal by a ringer circuit.

Furthermore, the ringer control circuit for achieving the above object may include a second relay circuit for switching the operation state or the non-operation state of the clip circuit.
By providing this second relay circuit, it is possible to switch whether or not to operate the clip circuit.

Further, in the ringer control circuit for achieving the above object, the second relay circuit may be a relay circuit that activates the clip circuit in a non-energized state and deactivates the clip circuit in an energized state. Good. In this case, the control means may receive the ringer signal from the telephone line and close the telephone line, and then turn on the second relay circuit.
If there is a possibility that the communication quality may be affected by the operation of the clip circuit during a call period or facsimile communication, the clip circuit can be prevented from operating during the call period or facsimile communication. As a result, communication quality can be ensured.

Furthermore, the ringer control circuit for achieving the above object may include an adjusting unit that adjusts a range of voltage to be clipped in the clip circuit.
The amplitude of the voltage recognized as a ringer signal may vary depending on the type of external telephone. For this reason, by providing means for adjusting the voltage so that the voltage can be clipped to the range corresponding to each of the various types of external telephones (the range in which the external telephone does not ring), It can be adjusted not to ring by the ringer signal.

  Furthermore, the present invention is also established as an invention of a facsimile apparatus provided with the above-described ringer control circuit. The facsimile apparatus may further include a print function, a scan function, and the like.

The present invention is also established as an invention of a ringer control method. That is, the ringer control method for achieving the above object includes a first step and a second step. In the first step, the first relay circuit that connects the telephone line and the external telephone in the de-energized state and the ringer circuit and the external telephone in the energized state is de-energized and comes from the telephone line. The ringer signal from the telephone line is received in a state where the clip circuit for clipping the voltage level of the ringer signal to the range where the external telephone does not ring is activated. In the second step, after receiving the ringer signal from the telephone line, it is determined whether the communication following the ringer signal is a telephone or a facsimile. In the case of a telephone, the first relay circuit is energized to cause the ringer circuit to generate a pseudo ringer signal. In the case of a facsimile, the first relay circuit is left in a non-energized state.
By adopting such a ringer control method, it is possible to satisfy both the situation where the external telephone is not ringed and the power consumption is reduced in the case of facsimile reception.

(1A) and (1B) are block diagrams showing the configuration of the MFP. The sequence chart which shows the operation | movement of the facsimile incoming call in a 1st specification. The sequence chart which shows the operation | movement of the telephone call in a 1st specification. The sequence chart which shows the operation | movement of the facsimile incoming call in a 2nd specification. The sequence chart which shows the operation | movement of the telephone call in 2nd specification. FIG. 6 is a block diagram showing a configuration of an MFP according to another embodiment. FIG. 6 is a block diagram showing a configuration of an MFP according to another embodiment. (8A) and (8B) are block diagrams showing the configuration of a conventional facsimile apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the corresponding component in each figure, and the overlapping description is abbreviate | omitted.
1. 1. First embodiment 1-1. Configuration FIG. 1A is a block diagram showing a configuration of a multifunction printer (MFP) 1 as a facsimile apparatus according to the present invention. The MFP 1 has a facsimile function, a scan function, and a print function. In order to realize these functions, the MFP 1 includes a control unit (control unit) 10, an image reading unit 20, an image forming unit 30, a user I / F unit 40, a first relay circuit Ry 1, and a ringer circuit 62. And a second relay circuit Ry2 and an overvoltage protector (OVP) 60. The external telephone 100 can be connected to a telephone line via the MFP 1.

  The control unit 10 is a main controller for controlling the entire MFP 1 and includes a CPU, a RAM, a ROM, and the like. The CPU can execute various programs recorded in the ROM using the RAM and the like. The control unit 10 includes dedicated circuits such as a tone detection unit, a ringback tone generation unit, an encoding unit, a decoding unit, a modem, a hook detection unit, and a ringer detection unit (all not shown). The tone detector detects a tone signal having a specific frequency coming from the telephone line. The ringback tone generator generates a ringback tone signal and outputs it to the telephone line. The encoding unit encodes the image data read by the image reading unit 20 and reduces the data size. The modem modulates the encoded data (digital) to generate an analog signal and output it to the telephone line. The modem demodulates the analog signal received from the telephone line to obtain encoded data (digital). The decoding unit decodes the encoded data to obtain image data. The hook detection unit detects the hook state of the handset of the external telephone 100. The ringer detection unit detects a ringer signal coming from a telephone line. The ringer signal is a call signal for ringing the telephone call bell, and is a signal having an amplitude of about 140 V and a frequency of 16 Hz. In a state where the OVP 60 described later is in operation, the ringer detection unit detects a clipped ringer signal (for example, a signal whose amplitude is clipped to about 50 V and whose frequency does not change is 16 Hz). The ringer detection unit can detect a ringer signal based on the frequency as long as the amplitude of the target signal exceeds the minimum amplitude detected as the ringer signal. Therefore, if the clip range (for example, 50 V) by the OVP 60 is larger than the minimum amplitude, a signal clipped to an amplitude of about 50 V by the OVP 60 can also be detected as a ringer signal.

  The image reading unit 20 includes a document placement unit, an ADF unit that transports a document placed on the document placement unit, a color line image sensor that optically reads a document transported by the ADF unit, and the like. In accordance with the control, the document is read to obtain image data. The image forming unit 30 includes a transport unit having a mechanism for transporting a print medium, a carriage that reciprocates in a direction perpendicular to the transport direction, an ink cartridge that is mounted on the carriage and contains ink of each color, and a print head. , And forms an image on a print medium based on print data transferred from the control unit 10 in accordance with the control of the control unit 10. The user I / F unit 40 includes a display panel and keys, displays various kinds of information on the display panel according to the control of the control unit 10, and transmits instruction contents according to the user's key input to the control unit 10. The user can select one of two specifications described later via the user I / F unit 40.

  The ringer circuit 62 generates and outputs a pseudo ringer signal having a waveform equivalent to that of a ringer signal coming from a telephone line (an unclipd ringer signal). The first relay circuit Ry1 is an electromagnetic relay that switches the connection destination of the external telephone 100 to a telephone line or a ringer circuit 62. When switch SW1 is off, first relay circuit Ry1 is in a non-energized state, and external telephone 100 is connected to a telephone line in the non-energized state. When the switch SW1 is on, a current flows through the coil L1, and the first relay circuit Ry1 is energized. The external telephone 100 is connected to the ringer circuit 62 in the energized state.

  The OVP 60 is a clipping circuit that clips the voltage level of the ringer signal coming from the telephone line to an amplitude that does not cause the external telephone 100 to ring (for example, about 50 V peak to peak). One terminal of the OVP 60 is connected to a signal line connected to the telephone line, and the other terminal is connected to a signal line connected to the telephone line via the second relay circuit Ry2. The second relay circuit Ry2 is an electromagnetic relay that switches operation / non-operation of the OVP 60. When the switch SW2 is off, the second relay circuit Ry2 is in a non-energized state, and the OVP 60 is energized and in an activated state when the second relay circuit Ry2 is in a non-energized state. When the switch SW2 is on, a current flows through the coil L2, and the second relay circuit Ry2 is energized. Since the OVP 60 is not energized when the second relay circuit Ry2 is energized, the OVP 60 is inactivated.

1-2. Operation The user of the MFP 1 can use the user I / F unit 40 to select the following two specifications regarding the presence or absence of a ringing tone when receiving a facsimile or telephone call. The first specification is such that the external telephone 100 is ringed when a call is received, but the external telephone 100 is not ringed when a facsimile is received. The second specification is such that both the telephone and the facsimile ring the external telephone 100 when receiving an incoming call. Next, operations at the time of facsimile incoming call and telephone incoming call according to these two specifications will be described in order.

(First specification)
FIG. 2 is a sequence chart showing an operation at the time of facsimile incoming call in the first specification. When the first specification is selected, the control unit 10 turns off both the switch SW1 and the switch SW2 during the standby period (step S100). Therefore, the first relay circuit Ry1 is in a non-energized state as shown in FIG. 1A, and the external telephone 100 is connected to a telephone line. The second relay circuit Ry2 is also in a non-energized state, and the OVP 60 is in an operating state. Note that there are a plurality of exchanges between the transmission source device and the MFP 1. In FIGS. 2 to 5, communication between the transmission source device and the exchange and communication between the exchanges are illustrated. Description is omitted.

  When the ringer signal arrives from the telephone line (from the exchange) in response to the dialing of the telephone number of the MFP 1 (step S105), the ringer signal having an amplitude of about 140V is clipped to about 50V by the OVP 60. Is done. Since the first relay circuit Ry1 is in a non-energized state, the ringer signal clipped to an amplitude of about 50V is transmitted to the external telephone 100, but the external telephone 100 does not ring at an amplitude of about 50V. When the ringer detection unit detects the clipped ringer signal, the control unit 10 closes the telephone line and turns on the switch SW2 (step S110). By closing the telephone line, a closed loop is formed between the nearest exchange and the MFP 1, and a direct current flows. When the switch SW2 is turned on, the second relay circuit Ry2 is energized and the OVP 60 is deactivated. That is, the signal coming from the telephone line is not clipped by the OVP 60. As a result, it is possible to prevent the OVP 60 from affecting a signal for subsequent facsimile communication (in the case of a telephone, a voice signal for a call), and to ensure communication quality. If the amplitude of a signal for subsequent facsimile communication (voice signal for a call in the case of a telephone) is within 50 V (within a range not exceeding the voltage to be clipped by OVP 60), OVP 60 is in communication quality. Therefore, the switch SW2 may remain off (the second relay circuit Ry2 is in a non-energized state, that is, the OVP 60 is in an operating state). If the second relay circuit Ry2 remains in a non-energized state, the power consumption can be reduced.

  After closing the telephone line, the controller 10 sends a ringback tone signal to the telephone line by the ringback tone generator (step S115). When the transmission source device transmits a facsimile, a CNG signal is transmitted from the transmission side (step S120). When the tone detection unit detects the CNG signal, the control unit 10 determines that it is a facsimile and shifts to a facsimile transmission control procedure such as a G3 system and transmits a predetermined control signal (CED, DIS, DCS, TCF, CFR, etc.). Replace with the original device (step S125). Subsequently, the control unit 10 receives an image signal which is a facsimile message from the transmission source device (step S130), and exchanges predetermined control signals (EOP, MCF, etc.) according to the facsimile transmission control procedure (step S135). ), The control unit 10 recognizes the completion of the facsimile communication by detecting the DCN signal (step S140). After detecting the DCN signal, the control unit 10 opens the telephone line and turns off the switch SW1 and the switch SW2 (step S145).

  The image signal received in step S130 is demodulated by a modem provided in the control unit 10 and decoded into image data by a decoding unit. The control unit 10 stores the decoded image data in the RAM and performs an operation designated as an operation at the time of facsimile reception. For example, when the received image data is stored without printing until the user gives an instruction, the image data is stored in the RAM as it is. For example, when the received image data is designated to be printed immediately, the image data is subjected to predetermined image processing for printing, and the processed print data is delivered to the image forming unit 30 to execute printing.

  FIG. 3 is a sequence chart showing the operation in the case of an incoming call in the first specification. Steps S200 to S215 are the same as steps S100 to 115 in FIG. Since the CNG signal cannot be detected within a predetermined time after the telephone line is closed in step S210, the control unit 10 determines that the telephone is not a facsimile and turns on the switch SW1 (step S220). The first relay circuit Ry1 is energized to connect the ringer circuit 62 and the external telephone 100. Then, the control unit 10 causes the ringer circuit 62 to generate a pseudo ringer signal (step S225). The external telephone 100 rings with the pseudo ringer signal generated by the ringer circuit 62 (step S230). When the handset of external telephone 100 is picked up (step S235), control unit 10 detects off-hook by the hook detection unit and turns off switch SW1 (step S240). When the switch SW1 is turned off again, the external telephone line and the external telephone 100 are connected by the first relay circuit Ry1, and a call can be made (step S245). Note that the control unit 10 repeatedly transmits a ringback tone signal to the telephone line after the telephone line is closed in step S210 until an off-hook is detected in step S240.

When the handset of the external telephone 100 is lowered (step S250), the control unit 10 detects the on-hook by the hook detection unit, releases the telephone line (step S255), and returns to the standby period.
As described above, in the case of the first specification, the switch SW1 and the switch SW2 are off in the standby period (the first relay circuit and the second relay circuit are in a non-energized state). Compared with a configuration in which is energized (for example, the configuration of FIG. 8A), power consumption can be reduced. In addition, the period during which the switch SW2 is turned on (the second relay circuit Ry2 is energized) is a period of facsimile reception operation or a telephone call period, and these periods are overwhelmingly shorter than the standby period. Compared with a configuration in which the relay circuit is energized during the standby period, power consumption can be reduced.

(Second specification)
FIG. 4 is a sequence chart showing an operation when a facsimile call is received in the second specification. When the second specification is selected, the control unit 10 turns off the switch SW1 and turns on the switch SW2 during the standby period (step S300). Therefore, the first relay circuit Ry1 is in a non-energized state as shown in FIG. 1A, and the external telephone 100 is connected to a telephone line. On the other hand, the second relay circuit Ry2 is energized, and the OVP 60 is inactive.

  When the ringer signal arrives from the telephone line (step S305), the external telephone 100 rings (step S310). Since the external telephone 100 and the telephone line are connected by the first relay circuit Ry1, and the OVP 60 is in an inoperative state, the external telephone 100 rings with a ringer signal having an amplitude of about 140V. When the user listens to the ringing tone of the external telephone 100 and picks up the handset of the external telephone 100 (step S315), the control unit 10 detects the off-hook of the external telephone 100 and closes the telephone line (step S320). In the case of facsimile, since a CNG signal is transmitted (step S325), the user recognizes that the incoming call is a facsimile by the sound heard from the handset, and instructs the MFP 1 to start the facsimile reception operation. Specifically, for example, the user presses the start button of the user I / F unit 40 of the MFP 1.

  When the control unit 10 receives an instruction to start a facsimile reception operation (step S330), the control unit 10 executes a facsimile transmission control procedure (steps S345 to S355) as in steps S125 to S135 of FIG. When the user instructs the start of the facsimile reception operation, the user lowers the handset of the external telephone 100 (step S335), and the control unit 10 detects off-hook (step S340). Note that the closing of the telephone line in step S320 may be performed automatically when, for example, an off-hook is not detected even after a predetermined time has elapsed since the ringer signal was detected. When the control unit 10 detects the DCN signal (step S360), it opens the telephone line (step S365).

FIG. 5 is a sequence chart showing an operation at the time of incoming call in the second specification. Steps S400 to S420 are the same as steps S300 to S320 in FIG. When the telephone line is closed in step S420, a call can be made (step S425). When the handset of external telephone 100 is lowered (step S430), control unit 10 detects an on-hook and releases the telephone line (step S435).
In the case of the second specification, the power consumption is higher than in the case of the first specification because the second relay circuit Ry2 is energized at least during the standby period, but it still meets the needs of users who prefer the second specification. I can respond.

  As shown in FIG. 1B, in the case of a model adopting only the second specification instead of the configuration in which the user can select the first specification or the second specification via the user I / F unit 40. The OVP 60, the second relay circuit Ry2, and the ringer circuit 62 may not be mounted on the circuit board (broken lines 60, Ry2, and 62 indicate a state where they are not mounted). The second specification can be realized by always turning off the switch SW1 and the switch SW2 without mounting the OVP 60, the second relay circuit Ry2, and the ringer circuit 62 on the circuit board. That is, if the switch SW1 and the switch SW2 are turned off in step S300 in FIG. 4 and step 400 in FIG. 5, the subsequent operation is the same as the contents described in FIG. 4 and FIG. realizable. The configuration for realizing the second specification by always turning off the switch SW1 and the switch SW2 without mounting the OVP 60, the second relay circuit Ry2, and the ringer circuit 62 on the board is the OVP 60, the second relay circuit Ry2, and the ringer. When the switch 62 is turned off and the switch SW2 is turned on in a state where the circuit 62 is mounted on the substrate, power consumption can be reduced as compared with a configuration that realizes the second specification.

  As described above, the first specification and the second specification can be selected by the user I / F unit 40, the model A, the model B adopting only the first specification, and the model adopting only the second specification. Since C can use a common circuit board, it can contribute to the reduction of development costs. Moreover, in addition to being able to share a circuit board, when the first specification is selected in model A or in model B, the realization of the first specification and the purpose of reducing power consumption are compatible. Can do. The model C has the purpose of realizing the second specification and reducing the power consumption by not mounting the OVP 60, the second relay circuit Ry2, and the ringer circuit 62 in addition to making the circuit boards common to the models A and B. Can be made compatible.

2. Other Embodiments The technical scope of the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention. For example, as shown in FIG. 6, the OVP 60 may be provided between the first relay circuit Ry1 and the external telephone 100.

  Note that the user may be able to specify a voltage range to be clipped in the OVP 60 via the user I / F unit 40. Depending on the individual difference of the external telephone 100 and internal specifications, there is a possibility that the range of the voltage level identified as the ringer signal is different. Therefore, it is desirable that the OVP 60 can be adjusted so that the ringer signal can be clipped within the range in which the ringing bell of the external telephone 100 does not ring via the user I / F unit 40. Specifically, as shown in FIG. 7, for example, a plurality of OVPs (for example, the first OVP 60 is clipped to an amplitude of 50 V and the second OVP 64 is clipped to an amplitude of 60 V) are mounted on the circuit board according to the range of voltage to be clipped. The OVP to be activated may be switched among a plurality of OVPs in accordance with the user's selection via the user I / F unit 40. In this case, the user I / F unit 40, the control unit 10, the switch SW2, the second relay circuit Ry2, the switch SW3, and the third relay circuit Ry3 correspond to the adjusting means.

  In order to prevent the external telephone 100 from ringing, it is better that the amplitude of the ringer signal is smaller, but the amplitude is maintained so that the clipped ringer signal can be detected as the ringer signal by the control unit 10 (ringer detection unit). Need to be. Therefore, the minimum amplitude that can be detected as a ringer signal in the control unit 10 may be acquired in the development stage, and an OVP clipped to the amplitude may be adopted and mounted on the circuit board.

  DESCRIPTION OF SYMBOLS 1 ... MFP, 10 ... Control part, 20 ... Image reading part, 30 ... Image formation part, 40 ... User I / F part, 60 ... OVP (1st OVP), 62 ... Ringer circuit, 64 ... OVP (2nd OVP) ), 100 ... external telephone, Ry1 ... first relay circuit, Ry2 ... second relay circuit, Ry3 ... third relay circuit, SW1 ... switch, SW2 ... switch, SW3 ... switch

Claims (6)

A clip circuit that clips the voltage level of the ringer signal coming from the telephone line to a range where the external telephone does not ring,
A ringer circuit for generating a pseudo ringer signal for ringing the external telephone;
A first relay circuit that connects the telephone line and the external telephone in a non-energized state, and connects the ringer circuit and the external telephone in a conductive state, and is in a non-energized state during a standby period A first relay circuit,
After receiving the ringer signal from the telephone line, it is determined whether the communication following the ringer signal is a telephone or a facsimile, and in the case of a telephone, the first relay circuit is energized to the ringer circuit. A control means for generating a pseudo ringer signal, and in the case of a facsimile, leaving the first relay circuit in a non-energized state;
A ringer control circuit comprising: A second relay circuit for switching the operating state or the non-operating state of the clip circuit;
The ringer control circuit according to claim 1. The second relay circuit is a relay circuit that activates the clip circuit in a non-energized state, and deactivates the clip circuit in an energized state;
The control means receives the ringer signal from the telephone line and closes the telephone line, and then places the second relay circuit in an energized state.
The ringer control circuit according to claim 2. Adjusting means for adjusting the clip voltage level of the clip circuit;
The ringer control circuit according to claim 1.   A facsimile apparatus comprising the ringer control circuit according to claim 1. In a non-energized state, a ringer signal arriving from the telephone line is set in a non-energized state in a first relay circuit that connects a telephone line and an external telephone in a non-energized state and connects a ringer circuit and the external telephone in a conductive state. A first step of receiving the ringer signal from the telephone line in a state in which a clip circuit for clipping the voltage level to a range where the external telephone does not ring is activated;
After receiving the Ringer signal from the telephone line, determine whether the communication following the Ringer signal is a telephone or a facsimile,
In the case of a telephone, the first relay circuit is energized, and the ringer circuit generates a pseudo ringer signal,
In the case of a facsimile, leave the first relay circuit in a non-energized state.
The second step,
Including a ringer control method.

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