JP2019106678A - Communication device, control method thereof, and program - Google Patents

Abstract

An off-hook detection circuit requires a large current capacity and high insulation performance, and therefore a photocoupler is used. However, this photocoupler is not a general-purpose electric component, and therefore a component cost is required. A communication device connects power supply means for supplying power to an external telephone and the external telephone and a communication line, or connects the external telephone and the power supply means. Off-hook of the external telephone is detected based on a change in the power supply state by the power supply means in a state where the switching means for switching and the external telephone and the power supply means are connected by the switching means. And a first detecting means. [Selection diagram]

Description

  The present invention relates to a communication apparatus, a control method thereof, and a program.

  Conventionally, off-hook detection / on-hook detection has been performed on the telephone line side where high voltage is applied. For example, according to Patent Document 1, an off-hook detection circuit 19 is provided in the conduction path 13A between the contact 11A of the telephone connection terminal 11 to which the external telephone 50 can be connected and the DPS relay 15 as connection switching means.

  In Patent Document 1, when the DPS relay 15 and the CML relay 16 are switched to the contact positions shown in FIG. 1, the telephone connection terminal 11 and the line connection terminal 12 are connected via the conduction paths 13A and 13B, and externally attached. A telephone 50 is connected to the telephone line 70. Here, when the external telephone 50 is in the off-hook state, a closed circuit is formed between the telephone connection terminal 11 and the line connection terminal 12. In the closed circuit, when the current detection unit 19A of the off-hook detection circuit 19 detects the current flowing in the closed circuit by the voltage of 48 V applied from the telephone line 70, the off-hook of the external telephone 50 is detected.

  The telephone line has a power supply capability to supply a voltage of 48 V and a current in the range of ± 120 mA according to the standard. Therefore, a large current capacity of ± 120 mA is required for the photocoupler included in the current detection unit connected to the telephone line via the connection terminal or the relay.

  Such an off-hook detection circuit is electrically connected to an external telephone line, so insulation from the primary side (telephone line side) and the secondary side (CPU side) from the viewpoint of lightning surge countermeasures, electric shock prevention, etc. Performance is also required. Therefore, for example, it is necessary to obtain an approval such as IEC 62368-1 which is a safety standard.

JP, 2010-278864, A

  As described above, in the conventional configuration, since the off-hook detection circuit is required to have a large current capacity and high insulation performance, a photocoupler which satisfies these is adopted for the off-hook detection circuit. However, since the photocoupler is not versatile as an electrical component, there is a problem that the cost of the component is increased.

  The present invention has been made in view of the above problems, and provides a technology for detecting an off-hook of an external telephone without the external telephone being connected to the communication line without considering the insulation performance with the communication line. The purpose is to

  In order to achieve the above object, a communication apparatus according to an aspect of the present invention has the following configuration. That is, the communication apparatus switches between switching the power supply means for supplying power to the external telephone, connecting the external telephone and the communication line, or connecting the external telephone and the power supply. First means for detecting an off-hook state of the external telephone based on a change in the state of power supply by the power supply means while the external telephone and the power supply means are connected by the switching means; And detection means.

  According to the present invention, off-hook of an external telephone can be detected in a state where the external telephone is not connected to the communication line without considering the insulation performance with the communication line.

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus according to an embodiment. It is an equivalent circuit diagram explaining the off-hook detection in the ringing state of the external telephone which concerns on 1st embodiment. It is a block diagram explaining the off-hook detection in the silent state of the external telephone which concerns on 1st embodiment. It is a figure showing an example of increase current deltaI which is change of a power supply circuit concerning a first embodiment, and increase frequency deltaf which is switching frequency change. FIG. 7 is a block diagram illustrating off-hook detection of a handset according to a second embodiment. It is a flowchart explaining the process performed when the facsimile apparatus which concerns on 3rd embodiment transfers to a sleep state. FIG. 16 is a flowchart illustrating processing executed when the facsimile apparatus according to the fourth embodiment recovers from the sleep state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of the features described in the embodiments are not necessarily essential to the solution means of the present invention. .

First Embodiment
First, a configuration example of a facsimile apparatus (communication apparatus) 100 according to the first embodiment will be described with reference to FIG.

  A system on chip (SOC) 101 controls the entire facsimile apparatus 100 and controls facsimile communication using a predetermined communication line. The SOC 101 includes a CPU 105, reads out a control computer program stored in a memory 129, and executes various processes for controlling the operation of the facsimile apparatus 100.

  An operation panel 123, a reading unit 126, a recording unit 127, and an interface (IF) unit 128 are connected to the SOC 101. The operation panel 123 is a user interface having a display 124 and a keyboard (KEY) 125. The display 124 is an output interface to the user, and displays the status of the facsimile apparatus 100 and the communication of the facsimile apparatus 100. The keyboard (KEY) 125 is a keyboard including buttons, numeric keys, and the like that receive various inputs from the user.

  The memory 129 is a memory that functions as a main memory and a work area of the CPU 105 of the SOC 101. The memory 129 also functions as a memory for temporarily storing image data and various information related to facsimile communication. The SDAA (Silicon Data Access Arrangement) program 130 stored in the memory 129 is a program executed by a DSP (digital signal processor) 108 of the modem 102. The SDAA program 130 is transferred from the memory 129 to the modem 102 by the SOC 101 at startup of the facsimile apparatus 100 and is executed by the DSP 108 after being developed in the RAM 107 of the modem 102.

  When a document is set in the facsimile apparatus 100, the reading unit 126 reads an image from the document and generates image data. The generated image data may be transmitted by facsimile communication to the communication apparatus on the other party side via the communication line 131, or may be printed by the recording unit 127. An interface (IF) unit 128 functions as an interface when various external information devices are connected.

  The modem 102 is connected to the SOC 101, operates based on control by the SOC 101, and also functions as an off-hook detection unit. The modem 102 performs modulation processing of image data read by the reading unit 126 and demodulation processing of a signal received via the communication line 131, which are executed in facsimile communication. In addition, modem 102 is connected to SDAA 104 through isolation element 103. The modem 102 includes a ROM 106, a RAM 107, a DSP 108, and a register 109.

  The ROM 106 stores a program developed on the RAM 107 and executed on the DSP 108. The RAM 107 is used to expand the SDAA program 130 transferred from the SOC 101 and the program stored in the ROM 106 and cause the DSP 108 to execute the program. The DSP 108 operates the modem 102 based on the contents of the RAM 107. The register 109 is a register for storing a value related to the operation state of the SDAA 104 or storing an instruction from the SOC 101.

  The SDAA 104 is a semiconductor NCU (network control unit), is connected to the communication line 131, and functions as an interface between the facsimile apparatus 100 and an external public line (communication line) 131. When performing a facsimile communication, the SDAA 104 not only connects (acquires) the line and controls the communication, but also the external telephone 230 communicates with the other party apparatus (the other party FAX) 220 via the communication line 131. Also in the case of voice communication, control of line capture is performed. The SDAA 104 executes these controls based on the control of the SOC 101. The SDAA 104 includes a line capture unit 110, a voltage detection unit 111, a current detection unit 112, a dial tone (DT) detection unit 113, and an AC filter 114.

  The line capture unit 110 controls the DC capture circuit 115 to adjust the DC impedance to perform DC capture of the line. This impedance is obtained by acquiring a current characteristic (hereinafter referred to as a DC-VI characteristic) with respect to a DC voltage set in advance.

  The voltage detection unit 111 monitors the voltage of the communication line 131. The current detection unit 112 monitors the current of the communication line 131. The DT detection unit 113 monitors a dial tone signal of the communication line 131. The AC filter 114 is connected to the front stage of the voltage detection unit 111 or the current detection unit 112 to remove an alternating current (AC) component. When the voltage detection unit 111 or the current detection unit 112 detects a DC voltage or a DC current, the AC filter 114 removes the AC component, so that the detection accuracy of the direct current (DC) component can be enhanced.

  The direct current capture circuit 115 is a peripheral circuit of the SDAA 104 including a current source such as a transistor, and adjusts the current impedance of the current source by adjusting the current of the current source and adjusting the direct current impedance under control of the SDAA 104. The DC capture circuit 115 is also used to create an open state of the communication line 131 and to transmit a dial pulse signal, which is a type of selection signal, to the communication line 131.

  The reception IF circuit 116 is an interface circuit for receiving a facsimile signal or the like via the communication line 131. The AC impedance matching circuit 117 is, for example, a matching circuit for matching the AC impedance of the facsimile apparatus 100 during communication to 600 ohms in the case of Japan.

  The rectifier circuit 118 includes a diode bridge and the like, and rectifies the signal from the line and transmits it to the circuit on the SDAA 104 side. The noise removal circuit 120 suppresses lightning surges and electromagnetic noises from the communication line 131 and, conversely, prevents the noise of the facsimile apparatus 100 from being sent out via the communication line 131. The protection element 119 is a current protection element configured by a fuse or the like.

  The CI detection circuit 121 is connected to the communication line 131, and detects a ringing signal (hereinafter referred to as "CI signal") received from the communication line 131. When the CI detection circuit 121 detects a CI signal from the communication line 131, the CI detection circuit 121 transmits a CI detection signal 122 indicating that to the SOC 101. The SOC 101 can determine, based on the CI detection signal 122 received from the CI detection circuit 121, whether or not a CI signal has arrived from the communication line 131. An external telephone 230 connected to the facsimile apparatus 100 is also connected to the communication line 131.

  The H relay 140 connects the external telephone 230 to the power supply circuit 145 or the communication line 131. H relay 140 is in a connection state (ringing state) for electrically connecting external telephone 230 and communication line 131, and in a disconnection state (electric ringing state) for electrically connecting external telephone 230 and power supply circuit 145. Switch between) and. The H relay 140 is controlled by an H relay drive signal 141 output from the SOC 101. As shown in FIG. 1, in the silent mode, the external telephone 230 does not ring even if a CI signal is transmitted from the communication line 131 to the facsimile apparatus 100, and the so-called silent mode of the facsimile apparatus 100 is achieved.

  The power supply circuit 145 supplies power to the idle external telephone 230 in order to detect off-hook or on-hook of the external telephone 230. The power supply circuit 145 outputs a change corresponding to the off-hook of the external telephone 230 in a silent state.

  The off-hook detection circuit 146 is connected to the power supply circuit 145 and detects off-hook or on-hook of the external telephone 230 in a silent state. The off-hook detection circuit 146 detects a change in the power supply circuit 145 that occurs due to the current flowing to the external telephone 230 at the off-hook time. Further, the off-hook detection circuit 146 transmits the off-hook or on-hook detection result of the external telephone 230 to the SOC 101 by the hook detection signal 147. The SOC 101 can detect the on-hook / off-hook of the external telephone 230 based on the hook detection signal 147.

  The PSTN 210 is a public switched telephone network, and is a communication line connectable to the facsimile apparatus 100. The partner FAX 220 is an example of another communication device connected to the communication line 131 via the PTSN 210 and serving as a communication partner of the facsimile machine 100 or the external telephone 230.

  The external telephone 230 can be connected to the facsimile apparatus 100, and when connected, is electrically connected to the communication line 131 via the H relay 140. In addition, SDAA 104 is connected to communication line 131 electrically in parallel with external telephone 230. In addition, the external telephone 230 has a dial function for making a call, and it is possible to make a call on the external telephone 230 alone.

  When the external telephone 230 is in a ringing state and the line capturing unit 110 is not in operation, the line capturing unit 110 transitions to a line open state so as not to affect the communication line 131. In the line open state, the modem 102 monitors the voltage on the line obtained by the voltage detection unit 111 of the SDAA 104 based on the control of the SOC 101, and stores the voltage value on the line in the register 109. Thus, a change in line voltage can be detected, and off-hook or on-hook of the ringing external telephone 230 can be detected.

  Next, with reference to FIG. 2, off-hook detection in the case of ringing in which the H relay 140 connects the external telephone 230 and the PTSN 210 will be described.

  FIG. 2 is an equivalent circuit diagram for explaining off-hook detection in a ringing state in which the external telephone 230 according to the embodiment is connected to the PSTN 210.

  The PSTN 210 is configured of a 48 V DC power supply 212 and a line impedance 211 as an equivalent circuit. The internal equivalent circuit of the external telephone 230 includes a hook switch 231 that closes when off-hook and an internal impedance 232 when closing. Although, as shown in FIG. 1, the SDAA 104 and other peripheral components for performing facsimile communication are connected to the communication line 131, the line capturing unit 110 is in an open state and the SDAA 104 is used for off-hook detection here. I omit it because it does not affect.

  The modem 102 monitors the voltage value associated with the voltage 131 on the line obtained by the voltage detection unit 111 of the SDAA 104 based on the control of the SOC 101, and stores the monitored voltage value in the register 109.

  When the external telephone 230 is on-hook, the hook switch 231 is in the open state, and the line voltage 240 of 48 [V] of the DC power supply 212 is output to the communication line 131 via the line impedance 211. On the other hand, when the external telephone 230 is off-hook, the hook switch 231 is closed, and 48 [V] of the DC power supply 212 is divided by the line impedance 211 and the internal impedance 232 in the communication line 131. The line voltage 241 is output. The divided line voltage 241 has a voltage value of 48 × (R2 ÷ (R1 + R2)) [V], where the line impedance 211 is R1 and the internal impedance 232 is R2.

  Therefore, by detecting the change of the voltage value corresponding to the change between the line voltage 240 and the line voltage 241, the modem 102 can detect the off-hook or on-hook of the ringing external telephone 230. Become.

  Next, with reference to FIG. 3, off-hook detection of the external telephone 230 in a no-call state where the H relay 140 connects the external telephone 230 and the power supply circuit 145 will be described.

  FIG. 3 is a block diagram for explaining off-hook detection when the external telephone 230 according to the embodiment is in a no-voice state.

  The power supply circuit 145 includes DCDC conversion circuits 401 and 402 and a DCDC separation circuit 403. The power supply circuit 145 is a circuit for supplying power to the external telephone 230 in order to detect off-hook or on-hook of the external telephone 230 in a silent state. The DCDC conversion circuit 401 boosts the 5 [V] supply power and supplies a 12 [V] boost power supply 407 to the DC-DC conversion circuit 402. The DCDC conversion circuit 402 boosts the 12 [V] boosting power supply 407 which is a power supply, and supplies a 24 [V] boosting power supply 406 to the DCDC separation circuit 403. The DCDC separation circuit 403 generates a 24 [V] power supply obtained by isolating the 24 [V] boost power supply 406 which is a power supply, and supplies the 24 [V] power supply to the external telephone 230. The DCDC separation circuit 403 uses a transformer or the like to isolate the input and output at the boundary line 404 so that induction lightning mixed from the outside such as the communication line 131 does not get into the circuit that may be touched by the user. Separation has been made.

  When the external telephone 230 is on-hook, the hook switch 231 is open, and the power supply line 405 is unloaded and no current flows. On the other hand, when the external telephone 230 is off-hook, the hook switch 231 is in a closed state, and the internal impedance 232 is connected to the power supply line 405 as a load, so an off-hook current flows.

  When transitioning from the on-hook state to the off-hook state as described above, the load current flows, the current flowing to the DCDC separation circuit 403 increases (ΔI1), and as a result, the current flowing to the DCDC conversion circuits 401 and 402 Also increase (ΔI2, ΔI3).

  Thus, the off-hook detection circuit 146 detects an increase current (ΔI1, ΔI2, ΔI3) as a change (change in power supply state) of the power supply circuit 145 caused by the current flowing in the off-hook state. As a result, it becomes possible to detect the off-hook of the external telephone 230 in a silent state.

  Alternatively, as the change of the power supply circuit 145, the increase amount (Δf1, Δf2, Δf3) of the switching frequency used to control the output voltage of the DCDC conversion circuit 401 or 402 and the DCDC separation circuit 403 may be used.

  Note that the DCDC conversion circuit may not be plural, and the power supply circuit 145 may have one DCDC conversion circuit and one DCDC separation circuit. In that case, the off-hook detection circuit 146 may perform off-hook detection from the increase current or increase frequency of either the DCDC conversion circuit or the DCDC separation circuit.

  FIG. 4 is a diagram showing an example of an increase current ΔI which is a change of the current of the power supply circuit 145 and an increase frequency Δf which is a change of the switching frequency.

  FIG. 4A shows a change in the amount of current in the on-hook state and the off-hook state (6 [mA] → 38 [mA]), and the increase current ΔI 408 (32 [mA]) is a current flowing in the off-hook state. This represents the amount of change in the current of the power supply circuit 145 that occurs as a result.

  Similarly, FIG. 4B shows a change in switching frequency of the power supply circuit 145 (13 [kHz] → 89 [kHz]) and an increase frequency Δf 408 (76 [kHz]) which are caused by the current flowing in the off-hook state. And show.

  The off-hook detection circuit 146 detects the off-hook of the external telephone 230 by the increase current ΔI (32 mA) or the increase frequency Δf (76 kHz). Also, the off-hook detection circuit 146 transmits a hook detection signal 147 indicating the off-hook state or the on-hook state of the external telephone 230 to the SOC 101 based on the detection result. The SOC 101 can determine the hook status (off hook or on hook) of the external telephone 230 based on the received hook detection signal 147.

  Here, the change of the power supply circuit 145 caused due to the off-hook may detect a change (ΔI3, Δf3) of the DCDC conversion circuit 401 that converts a lower voltage. This is because the power consumed by the internal impedance 232 is constant, and when the magnifications of the voltages boosted by the two conversion circuits are approximately the same, the amount of increase in current increases as the voltage at the input decreases. As a result, the DCDC conversion circuit 401 can increase the detection sensitivity of the increase current more than the DCDC conversion circuit 402, and the off-hook detection circuit 146 can easily detect the off-hook.

  Similarly, as the increase current increases, the increase frequency also increases because the switching operation performed to control the output voltage becomes frequent. As a result, the DCDC conversion circuit 401 can increase the detection sensitivity of the increase frequency more than the DCDC conversion circuit 402, and the off-hook detection circuit 146 can easily detect the off-hook.

  As described above, according to the first embodiment, the user side (secondary side) circuit isolated from the communication line 131 includes the off-hook detection circuit 146 for detecting the off-hook of the external telephone 230 and the modem 102. . As a result, the off-hook detection circuit 146 and the modem 102 are not required to have a large current capacity or high insulation performance, and an electric component which does not require a smaller current capacity or approval such as IEC 62368-1 can be used. Cost reduction is possible.

Second Embodiment
Referring to FIG. 1, a facsimile apparatus 100 according to a second embodiment, which is a further development of the first embodiment and includes a handset 143, will be described. The description of the same configuration as that of the first embodiment will be omitted.

  The codec 142 matches the voice digital signal handled by the modem 102 with the voice analog signal handled by the handset 143 by performing encoding or decoding processing during a voice call.

  The handset 143 is a handset disposed in the facsimile apparatus 100, and is connected to the modem 102 via the codec 142. The control of the SOC 101 enables voice communication with an external communication device from the handset 143 via the modem 102, the communication line 131, and the like. The handset 143 also has a mechanical hook switch, and transmits an off-hook or on-hook detection result indicating the state of the hook switch to the SOC 101 as a hook detection signal 144. Based on the hook detection signal 144, the SOC 101 can determine the on-hook / off-hook state of the handset 143.

  The off-hook detection of the handset 143 will now be described with reference to FIG.

  FIG. 5 is a block diagram for explaining the configuration for detecting the off-hook of the handset 143 according to the second embodiment.

  The codec 142 includes an interface (I / F) 301, a DAC 302 which is a digital-to-analog converter, and an ADC 303 which is an analog-to-digital converter. The I / F 301 is an interface circuit for the codec 142 to transmit / receive PCM voice data to / from the modem 102 via the PCM communication line 310.

  The PCM voice data transmitted from the modem 102 and received by the codec 142 is converted from digital to analog by the DAC 302 and output to the signal line 308 as an analog voice signal. Also, the analog voice signal input from the signal line 309 is analog-to-digital converted in the ADC 303 and output as PCM voice data to the modem 102 through the PCM communication line 310.

  The handset 143 has a speaker 304 and a microphone 305. The speaker 304 outputs an analog audio signal output from the codec 142 via the signal line 308. The microphone 305 inputs an analog voice signal input from the handset 143 to the codec 142 via the communication line 309. The handset 143 also has an impedance 306 connected to the VCC 308, the mechanical hook switch 307, and the VCC 308 to generate a hook detection signal 144 which is the result of off-hook or on-hook detection.

  When the handset 143 is in the on-hook state, the hook switch 307 is closed and the hook detection signal 144 is LOW. When the handset 143 is in the off-hook state, the hook switch is released and the hook detection signal 144 is HIGH. The hook detection signal 144 is transmitted to the SOC 101, and the SOC 101 can determine the state of the hook in the handset 143 based on the hook detection signal 144.

  As described above, according to the second embodiment, the user side (secondary side) circuit isolated from the communication line 131 is provided with the handset 143 capable of off-hook detection. As a result, the off-hook detection unit of the handset 143 is not required to have a large current capacity or high insulation performance, and an electrical component that does not require a smaller current capacity or approval such as IEC 62368-1 can be used. Cost can be realized.

Third Embodiment
In the third embodiment, processing in the case where the facsimile apparatus 100 transitions to the sleep state (during sleep transition) in the first or second embodiment will be described with reference to FIG.

  FIG. 6 is a flowchart for explaining the process executed when the facsimile apparatus according to the third embodiment shifts to the sleep state. The process shown in the flowchart of FIG. 6 is realized by the SOC 101 executing a program developed in the memory 129.

  In step S601, the SOC 101 determines whether the facsimile apparatus 100 conforms to a preset sleep transition condition. The sleep transition condition may be that the user has instructed sleep, or that the user's operation has not been received for a predetermined time. If the SOC 101 determines that the sleep transition condition is not met, the SOC 101 repeats the process of S601. If the SOC 101 determines that the sleep transition condition is met in S601, the SOC 101 advances the process to S602. In step S602, the SOC 101 turns off the power supply of the modem 102 and the SDAA 104. Subsequently, the SOC 101 proceeds to S603, controls the H relay 140 so that the external telephone 230 is connected to the communication line 131, that is, in a ringing state, and turns off the power supply to the H relay 140. Subsequently, the SOC 101 advances to S 604, and the SOC 101 turns off the power supply of the power supply circuit 145 and the off-hook detection circuit 146 which became unnecessary for operation because the external telephone 230 was disconnected. Subsequently, the SOC 101 advances to S605, and shifts the SOC 101 itself to the sleep mode.

  Here, at the time of sleep transition, the external telephone 230 is in a ringing state, and power to the external telephone 230 is supplied from the communication line 131. Furthermore, it is possible to make a call using the external telephone 230 alone, and when making a call from the external telephone 230, it is not necessary to wake up the facsimile apparatus 100. Therefore, the hookup of the external telephone 230 does not become a requirement to return to sleep, and the power of the modem 102 and the offhook detection circuit 146 that perform the offhook detection of the external telephone 230 can be turned off.

  As described later, when the facsimile apparatus 100 includes the handset 143, the handset 143 needs to output the hook detection signal 144 by the hook-up operation to return the facsimile apparatus 100 to sleep. Therefore, even in the case of transition to the sleep state, VCC 308 which is a power supply for off-hook detection shown in FIG. 5 is not turned off.

  As described above, according to the third embodiment, since the external telephone 230 can be supplied with power from the communication line 131 and can communicate independently, the off-hook detection unit 146 of the external telephone 230 can be used. It can be made to transition to the sleep state (stop). That is, in the sleep state, the external telephone 230 is put into a ringing state, and off-hook detection is not performed. Thereby, power consumption in the sleep state can be further reduced.

Fourth Embodiment
In the fourth embodiment, with reference to FIG. 7, the processing in the case where the facsimile apparatus 100 recovers from the sleep state will be described by developing any of the first to third embodiments. The description of the same configuration as any of the first to third embodiments will be omitted.

  FIG. 7 is a flow chart for explaining the process executed when the facsimile apparatus according to the fourth embodiment returns from the sleep state.

  In S701, one of the components of the facsimile apparatus 100 determines whether a wakeup factor has occurred. For example, when the operation panel 123 is operated by the user, the operation panel 123 is, when the handset 143 is hooked up, the handset 143 is received, or when the call is received from the partner FAX 220, the CI detection circuit 121 Determine the occurrence. If one of the components determines that the sleep return factor has occurred in S701, the facsimile apparatus 100 proceeds to S702.

  In step S702, the component determined to have caused the wakeup factor supplies an interrupt signal for wakeup to the SOC 101. When the operation panel 123 is operated in S701, the input signal is for hook-up operation of the handset 143, the hook detection signal 144 is for call reception from the partner FAX 220, and the CI detection signal 122 is for sleep recovery. It may be an interrupt signal.

  In step S703, the SOC 101 that has received the interrupt signal for sleep recovery executes the sleep recovery processing of the SOC 101 itself. When the sleep recovery process of the SOC 101 is completed, if it is determined in S703 that the SOC 101 has returned to the operating state, the SOC 101 proceeds to S704.

  In step S704, the SOC 101 restores the modem 102 and the SDAA 104 from the sleep state (turns on the power), and then the SOC 101 advances the process to step S705. In step S705, the SOC 101 restores the power supply circuit 145 and the off-hook detection circuit 146 from sleep (turns on the power), and the process proceeds to step S706. In step S706, the SOC 101 restores the H relay 140 from sleep (turns on the power), and ends the sleep return processing.

  As described above, according to the fourth embodiment, the facsimile apparatus 100 can also return from the sleep state by the handset 143.

Other Embodiments
The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. Can also be realized. It can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

101: SOC, 102: modem, 104: SDAA, 107: RAM, 108: DSP, 110: line capture unit, 111: voltage detection unit, 112: current detection unit, 113: DT detection means, 114: AC filter means, 115: DC capture circuit, 121: CI detection circuit, 123: operation panel, 130: SDAA program, 140: H relay, 142: codec, 143: handset, 145: current supply circuit, 146: off-hook detection circuit, 210: PTSN , 230: external phone

Claims (12)

Power supply means for supplying power to the external telephone;
Switching means for switching so as to connect the external telephone and the communication line or to connect the external telephone and the power supply means;
First detection means for detecting an off-hook of the external telephone based on a change in a power supply state by the power supply in a state where the external telephone and the power supply are connected by the switching means; ,
A communication apparatus comprising:   The communication apparatus according to claim 1, wherein the change in the power supply state is a change in current supplied to the external telephone.   The communication apparatus according to claim 1, wherein the change of the power supply state is a change of a switching frequency of the power supply unit.   The apparatus according to any one of claims 1 to 3, further comprising second detection means for detecting an off-hook of the external telephone in a state where the external telephone and the communication line are connected by the switching means. The communication device according to claim 1.   5. A communication apparatus according to claim 4, wherein said second detection means comprises a modem.   The power supply means includes a DCDC conversion means and a DCDC separation means, and the change in the power supply state is a change in current of the DCDC conversion means or the DCDC separation means. Communication device.   The power supply means includes a DCDC conversion means and a DCDC separation means, and the change in the power supply state is a change in switching frequency of the DCDC conversion means or the DCDC separation means. Communication device.   The communication apparatus according to claim 6, wherein the power supply means includes a plurality of DCDC conversion means, and the change in the power supply state is a change in current of the DCDC conversion means for converting a lower voltage. .   8. The communication according to claim 7, wherein the power supply means includes a plurality of DCDC conversion means, and the change in the power supply state is a change in switching frequency of the DCDC conversion means for converting a lower voltage. apparatus.   6. A communication device according to claim 5, further comprising a handset connected to said modem via codec means for making voice calls. A power supply step of supplying power to the external telephone by the power supply means;
A switching step of switching to connect the external telephone and the communication line, or to connect the external telephone and the power supply means;
A first detection step of detecting an off-hook of the external telephone based on a change in a power supply state by the power supply in a state where the external telephone and the power supply are connected in the switching step; ,
And controlling the communication apparatus. A power supply step of supplying power to the external telephone by the power supply means;
A switching step of switching to connect the external telephone and the communication line, or to connect the external telephone and the power supply means;
A first detection step of detecting an off-hook of the external telephone based on a change in a power supply state by the power supply in a state where the external telephone and the power supply are connected in the switching step; ,
A program for causing a computer to execute each process in a control method of a communication apparatus, comprising:

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