JP2004159364A - Communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: when a plurality of communication devices are connected in parallel with a single telephone line, if each of the devices has the function of responding a number display service, each device responds to the service and cannot take correct processing timing between each device and a relay station, resulting in failure of responding to the number display service. <P>SOLUTION: A communication device 3, which responds to a call originator's telephone number display service, comprises a means 11 of determining whether another device 5, connected to a single telephone line L in parallel, has given a primary response responding to the originator's telephone number display service; and a means 6 of giving the primary response, when a device other than the above is determined as having not given the primary response, as a result of determination by the means. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a communication device.

  At present, communication apparatuses such as telephone apparatuses and facsimile apparatuses have a function corresponding to a caller telephone number guidance service (number display service) which has been started nationwide on February 1, this year (for example, And JP-A-8-204807). This service is a service for notifying the calling party's telephone number from the relay station at the time of an incoming call. If the above-described apparatus is made compatible with this service, it is possible to confirm the calling side before closing the called side.

  However, conventionally, there are many cases where not only one communication device is connected to one telephone line but also a plurality of communication devices are connected in parallel.

  As described above, when a plurality of communication devices are connected to one telephone line in parallel, if each of the communication devices has a function corresponding to the number display service, the number display service corresponds to each device. Therefore, there is a problem that it is not possible to accurately determine the processing timing between each device and the relay station, and as a result, it becomes impossible to support the number display service.

    SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a feature corresponding to a caller telephone number guidance service, which can be connected to one telephone line in parallel with another device and has a built-in telephone. A detection circuit for detecting a 16 Hz signal from a line, and when the detection circuit detects the arrival of the 16 Hz signal, prohibits line closing by off-hook of the built-in telephone, and detects the 16 Hz signal detected by the detection circuit. A control circuit configured to release a prohibition of line closing by off-hook of the built-in telephone when it is determined that the ON period of the signal is not a predetermined time defined as a start signal.

  A communication device that supports a caller's telephone number guidance service, can be connected to one telephone line in parallel with other devices, and has a built-in telephone, and detects a 16 Hz signal from the line. Circuit, when the detection circuit detects the arrival of the 16 Hz signal, the line closing by the off-hook of the built-in telephone is prohibited, and the off period of the 16 Hz signal detected by the detection circuit must be a predetermined time defined as a start signal. And a control circuit for controlling so as to cancel the prohibition of the line closing due to the off-hook of the built-in telephone.

  Furthermore, a communication device which supports a caller's telephone number guidance service, is connected to one telephone line in parallel with another device and has a built-in telephone, and detects a 16 Hz signal from the line. When the detection circuit detects the arrival of a 16 Hz signal, it prohibits line closing due to the off-hook of the built-in telephone, and the ON period of the 16 Hz signal detected by the detection circuit is a predetermined time defined as a start signal. When it is determined that the off period of the 16 Hz signal detected by the detection circuit is a predetermined time defined as a start signal, the 16 Hz signal is determined to be a start signal, and the detection circuit detects the 16 Hz signal. It is determined that the ON period of the 16 Hz signal is not the predetermined time defined as the activation signal, or the OFF period of the 16 Hz signal detected by the detection circuit is activated. If it is determined that not the predetermined time defined as item, and having a control circuit for controlling so as to cancel the prohibition of the circuit closing by the off-hook of the internal telephone.

  As is apparent from the above description, according to the present invention, even when a communication device having a function corresponding to the number display service is connected in parallel to one telephone line, the modem signal from the relay station can be reliably transmitted. Can be received.

  FIG. 1 is a schematic diagram showing an example of a procedure for receiving a number display service. First, the procedure for receiving a number display service will be described based on this schematic diagram.

Upon receiving a connection request from the calling party, the relay station inverts the polarity of the telephone line connected to the called party, sets a period of 16 Hz for 1 second, and a discontinuity ratio of 50% (ON: OFF = 1: 1: 1). ) Is transmitted to the called terminal via the telephone line. When the called terminal detects the activation signal (CAR) and makes a primary response by closing the line, the relay station detects this and sends information (telephone number etc.) indicating the calling side to 1200 bps. And sends it to the called terminal. The called terminal completes the reception of this information and releases the line. When this release is detected by the relay station, the relay station sends a normal ringing signal of 16 Hz (one second on, two seconds off) to the called terminal via the telephone line.

  The activation signal (CAR) is a signal transmitted only for 6 seconds after the inversion of the telephone line polarity. If there is no primary response from the called terminal during this period, the called device will be switched to the number display service. Assuming that the service is not supported, interrupt this service and make a normal call. After the completion of the transmission of the modem signal based on the reception of the primary response at the relay station, the called terminal receives the signal within about 2 seconds (with a dial-in function) or 6 seconds (without a dial-in function). Completion processing must be performed, and if it is not possible to detect the line release of the called terminal indicating that the reception of the modem signal has been completed within this time, an error is generated and a beep tone is sent out to the line, and a call from the calling side is issued. Cancel the calling process based on the connection request.

FIG. 2 is a block diagram showing a main circuit configuration of a facsimile apparatus to which the present invention is applied.

The apparatus of the present embodiment has a facsimile unit including a transformer 1, a modem 2 and a main control unit 3, and a telephone unit including a built-in telephone 4 composed of a handset and capable of connecting an external telephone 5, and a CML relay 6. The telephone line L is selectively switched between the FAX unit and the telephone unit. On the telephone line L side of the CML relay 6, a reversal detection circuit 7 for detecting the polarity reversal of the telephone line L and a detection circuit 8 for detecting a 16 Hz signal are connected. The detection results of the circuits 7 and 8 are output to the main control unit 3. In the facsimile unit, the transformer 1, the modem 2, and the main control unit 3 are connected to the contact a of the CML relay 6 in this order. In the telephone unit, the built-in telephone 4 is connected to the contact b of the CML relay 6 via the first opening / closing relay 9, and the external telephone 5 is connected via the second opening / closing relay 10 and the hook detection circuit 11. I have. The hook detection circuit 11 is formed of, for example, a photocoupler, and detects a line current generated when the external telephone 5 is connected to the telephone line L via the CML relay 6 and the second opening / closing relay 10. The detection result is output to the main control unit 3. The CML relay 6 and the first and second switching relays 9 and 10 are controlled by the main control unit 3. A high impedance connection is made between the contacts a and b of the CML relay 6 by, for example, a capacitor 13 or the like.

  The main control unit 3 controls each of the above units according to a built-in control program.

FIGS. 3 and 4 are flowcharts showing the control operation of the main control unit 3 at the time of an incoming call according to the above-described control program.

  In the apparatus of this embodiment, at the time of standby, the CML relay 6 is connected to the contact b side, and the first and second switching contacts 9 and 10 are both closed.

  In this state, the main control unit 3 determines in step S1 whether or not there is a call (incoming call) from the relay station. Specifically, at the beginning of an incoming call from the relay station, a 16 Hz signal arrives via the telephone line L or the polarity of the telephone line L is inverted. The arrival of the 16-Hz signal is detected by the 16-Hz detection circuit 8, and the detection result is sent to the main control section 3. The polarity inversion of the telephone line L is detected by the inversion detection circuit 7, and the detection result is controlled by the main control section. The main controller 3 determines whether there is an incoming call from the telephone line L based on the detection result.

  When an incoming call is detected in step S1, the main controller 3 determines again whether a 16 Hz signal is coming from the telephone line L based on the output of the 16 Hz detection circuit 8 in step S2. This determination, the polarity reversal determined in the S1 step may be due to a line abnormality, or the output of the 16 Hz signal at the relay station may be delayed from the polarity reversal and the 16 Hz signal may not be detected in the S1 step. It is determined whether or not a 16 Hz signal has arrived, just in case. If it is determined in this determination that a 16 Hz signal has not arrived, the process returns to step S1 to be in a standby state.

  Upon detecting the arrival of the 16-Hz signal in step S2, the main control unit 3 resets the built-in monitoring timer to start timekeeping in step S3, sets the first opening / closing relay 9 to the open state, and sets the built-in telephone 4 off-hook. Prohibit line closing by

  In the subsequent S4 step, the main control unit 3 measures the ON period of the 16 Hz signal. Specifically, the time from the rise to the fall of the 16 Hz signal is measured using a built-in period measurement timer circuit.

  When the measurement of the ON period of the 16 Hz signal is completed, in step S5, the main control unit 3 sets the ON time of the 16 Hz signal measured in step S4 to a predetermined time (about 0) defined as the activation signal (CAR). .5 seconds). In this determination, the main control unit 3 advances the processing to step S6 if it is determined that the time is within the above-mentioned predetermined time, and otherwise advances the processing to step S8.

  In step S6, the main control unit 3 measures the off period of the 16 Hz signal. Specifically, the time from the fall to the rise of the 16 Hz signal is measured using a built-in period measurement timer circuit.

  After finishing the measurement of the off period of the 16 Hz signal, in step S7, the main control unit 3 determines that the off time of the 16 Hz signal measured in step S6 is a predetermined time (about 0) defined as the start signal (CAR). .5 seconds). In this determination, the main control section 3 advances the processing to step S10 if it is determined that the time is within the above-mentioned predetermined time, and otherwise advances the processing to step S8.

  That is, in steps S4 to S7, it is determined whether or not the 16 Hz signal detected in step S2 indicates the start signal (CAR). When both the determinations in steps S5 and S7 are YES, the process proceeds to step S2. It is determined that the 16 Hz signal detected in the step indicates the activation signal (CAR), and the process proceeds to step S10 in order to perform a process according to the reception procedure of the number display service. On the other hand, when it is determined as NO in any of the steps S5 and S7, the 16 Hz signal detected in the step S2 is not a signal indicating the activation signal (CAR) but a normal call signal, and the processing is performed in step S8. Proceed to

  In the present embodiment, whether or not the 16 Hz signal detected in step S2 is the activation signal (CAR) is determined in both the ON period and the OFF period of the 16 Hz signal. Is also good.

  In step S8, the main control unit 3 controls the first opening / closing relay 9 to return the first opening / closing relay 9 that has been opened in step S3 to the closed state. Whether the polarity reversal of the telephone line L has been reversed or not is determined based on the detection result of the reversal detection circuit 7. In this determination, when the caller's terminal releases the telephone line, the relay station reverses the polarity reversal of the telephone line L accordingly, so that the call from the caller's terminal is substantially ended. Is determined.

  In step S9, when the return is determined, the main control unit 3 returns the process to step S1 to be in a standby state. Otherwise, the 16 Hz signal detected in step S2 is determined to be a normal calling signal, and normal reception is performed. Processing will be executed.

  When the main control unit 3 advances the process to step S10, it is determined that the 16 Hz signal detected in step S2 is the activation signal (CAR) as described above. The attached telephone 5 detects the activation signal (CAR) and determines whether or not it has made a primary response. Specifically, in this state, since the external telephone 5 can be connected to the telephone line L via the CML relay 6 and the second switching relay 10, the external telephone 5 responds to the activation signal (CAR). Then, when the line is closed (primary response), a call current flows between the telephone line L via the CML relay 6 and the second opening / closing relay 10, and this is detected by the hook detection circuit 11, The main control unit 3 can detect the primary response of the external telephone 5 based on the detection result. In step S10, upon detecting the primary response of the external telephone 5, the main control unit 10 advances the processing to step S13 shown in FIG. 4, and if not, advances the processing to step S11.

  In step S11, the main controller 3 determines whether or not the time measured by the built-in monitoring timer that started the time measurement in step S3 is equal to or longer than a predetermined time. In this determination, as described above, the generation period of the activation signal (CAR) is about 6 seconds after the polarity reversal of the telephone line L, and if the primary response is not performed within this period, the relay station determines the number of the called party device as the number. If the external telephone 5 does not make a primary response, the FAX unit makes a primary response if the external telephone 5 does not make a primary response. In the present embodiment, the predetermined time is shorter than the generation period of the activation signal (CAR), and the time required from the detection of the activation signal (CAR) to the primary response in a normal device of this type is considered. It is set to about 4 seconds.

  In step S11, if the main control unit 3 determines that the time measured by the built-in monitoring timer is not equal to or longer than the predetermined time, the process returns to step S10, and if not, the process proceeds to step S12.

  In step S12, the main control unit 3 makes a primary response to the activation signal (CAR) in place of the external telephone 5. Specifically, the main control section 3 switches and connects the CML relay 6 to the contact a side, and connects and closes the FAX section to the telephone line L. Thereafter, the main control section 3 advances the processing to the step S13 shown in FIG.

  That is, in the steps S10 to S12, if the external telephone 5 does not make a primary response within a predetermined time (about 6 seconds) from the start of generation of the activation signal (CAR), the apparatus of the present embodiment itself performs the primary response. Make a response.

  In step S13 shown in FIG. 4, the main control unit 3 sets up the modem 12 in a mode corresponding to the reception of a 1200 bps modem signal, and starts timing after resetting a built-in monitoring timer.

  In the subsequent step S14, the main control unit 3 receives a modem signal. More specifically, when it is detected in step S10 that the external telephone 5 has made the primary response, the CML relay 6 is in the state of being connected to the contact b, so that the modem signal transmitted from the relay station is transmitted. Can be received by the external telephone 5 and also received by the modem 12 via the high impedance capacitor 13. When the external telephone 5 makes a primary response by switching and connecting the CML relay 6 to the contact a in step S12 without making a primary response, the CML relay 6 is connected to the contact a. Therefore, the modem signal transmitted from the relay station cannot be received by the external telephone 5, but is received by the modem 12 via the CML relay 6. The modem signal received by the modem 12 is demodulated into a form that can be processed by the main control unit 3, and then transmitted to the main control unit 3.

  If it is determined in step S14 that a modem signal has been received, the main control unit 3 advances the process to step S16. If not, the main control unit 3 performs step S15.

  In step S15, the main control unit 3 determines whether or not the time measured by the built-in monitoring timer that started the time measurement in step S13 is equal to or longer than a second predetermined time. This determination is an error if the reception is not completed within a specific time (2 seconds or 6 seconds) from the completion of the transmission of the modem signal in the relay station as described above, so even if the modem signal is not received. This is for forcibly shifting to the reception completion processing. Since the time from the detection of the primary response at the relay station to the completion of the transmission of the modem signal is specified to be about 3 seconds, the second predetermined time is set to 4 seconds in this embodiment.

  In step S15, if the main control unit 3 determines that the monitoring timer has not counted the second predetermined time, the process returns to step S14, and if it determines that the time has counted, the process proceeds to step S16.

  In step S16, the main control unit 3 restores the modem 12 set in the mode corresponding to the reception of the 1200 bps modem signal in the step S13 to a mode corresponding to the reception of other signals such as DTMF, CNG, and not shown. The information indicating the caller side in the modem signal received in step S14 is displayed on the display unit.

  In the subsequent S17 step, the main control unit 3 releases all the FAX unit and the telephone unit from the telephone line L, and specifies the completion of reception to the relay station. Specifically, the main control unit 3 connects the CML relay 6 to the contact b side, opens the first and second on / off relays 9, 10, and holds this state for about 1.2 seconds. The first and second switching relays 9 and 10 are returned to the closed state. As a result, the relay station can detect the completion of the reception, and thereafter sends a normal call signal on the line L.

  When the reception completion processing in step S17 is completed, the main control unit 3 executes a normal reception operation based on a normal call signal sent from the relay station.

  As described above, according to the present embodiment, even when the external telephone 5 has a function corresponding to the number display service, the primary response from the external telephone 5 is prioritized and the primary response is , The reception timing of the modem signal is determined, so that the processing timing with the relay station can be accurately determined.

  If the external telephone 5 does not make a primary response or does not have a primary response function, the apparatus of the present embodiment detects that there is no primary response from the external telephone 5, and Since the response is made, the primary response can be reliably performed.

  Furthermore, after receiving the modem signal, all the devices are disconnected from the line regardless of the line release processing of the external telephone 5, so that the reception completion notification to the relay station can be reliably performed.

  In this embodiment, the presence or absence of the primary response of the external telephone 5 is always determined. However, for example, the presence or absence of a function corresponding to the number display service of the external telephone 5 can be set in advance by a switch or the like. When a telephone having no function corresponding to the number display service is set to be connected as an external telephone, it is configured to pass the primary response detection of the external telephone 5 in steps S10 and S11. Can be. Thereby, the time for the primary response processing can be reduced. In this case, in order to prevent the line from being closed in response to the ringing of the external telephone 5 by the activation signal (CAR), off-hook is prohibited during the number display service period of the relay station as in the case of the built-in telephone 4. It is preferable that the second switching relay 10 is kept open.

It is a schematic diagram for explaining a number display service. FIG. 1 is a block diagram showing a main circuit configuration of an embodiment to which the present invention is applied. 5 is a flowchart for explaining the operation of the present embodiment. 5 is a flowchart for explaining the operation of the present embodiment.

Explanation of reference numerals

2 Modem 3 Main control unit 5 External telephone 6 CML relay 7 Inversion detection circuit 8 16 Hz detection circuit 10 Second switching relay 11 Hook detection circuit

Claims (3)

A communication device which supports a caller telephone number guidance service, is connectable to one telephone line in parallel with another device, and has a built-in telephone.
A detection circuit for detecting a 16 Hz signal from the line;
When the detection circuit detects the arrival of the 16 Hz signal, it prohibits line closing due to the off-hook of the built-in telephone, and determines that the ON period of the 16 Hz signal detected by the detection circuit is not the predetermined time defined as the start signal, A control circuit for controlling so as to cancel the prohibition of line closing by off-hook of the built-in telephone. A communication device which supports a caller telephone number guidance service, is connectable to one telephone line in parallel with another device, and has a built-in telephone.
A detection circuit for detecting a 16 Hz signal from the line;
When the detection circuit detects the arrival of the 16 Hz signal, it prohibits line closing due to the off-hook of the built-in telephone, and determines that the off period of the 16 Hz signal detected by the detection circuit is not the predetermined time defined as the start signal, A control circuit for controlling so as to cancel the prohibition of line closing by off-hook of the built-in telephone. A communication device which supports a caller telephone number guidance service, is connected to one telephone line in parallel with another device, and has a built-in telephone.
A detection circuit for detecting a 16 Hz signal from the line;
When the detection circuit detects the arrival of the 16 Hz signal, the line closing due to the off-hook of the built-in telephone is prohibited, and it is determined that the ON period of the 16 Hz signal detected by the detection circuit is a predetermined time defined as a start signal. When it is determined that the off period of the 16 Hz signal detected by the detection circuit is a predetermined time defined as a start signal, the 16 Hz signal is determined to be a start signal, while the 16 Hz signal detected by the detection circuit is determined. When it is determined that the on period of the 16 Hz signal detected by the detection circuit is not the predetermined time defined as the start signal, or when it is determined that the off period of the 16 Hz signal detected by the detection circuit is not the predetermined time defined as the start signal, A control circuit for controlling so as to cancel the prohibition of line closing by off-hook;
A communication device comprising:

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