JP5136908B2 - Telephone equipment - Google Patents

Description

  The present invention relates to a telephone device, and more particularly, to an analog single telephone (hereinafter abbreviated as a single telephone) and a general telephone apparatus (PBX, key telephone, etc.) that accommodates a door phone.

  Recently, as a unit of a telephone device such as a key telephone system or a PBX (Private Branch Exchange), it has become essential to provide not only a single telephone but also an interface of a door phone. Japanese Laid-Open Patent Publication No. 2000-049954, “Door Phone Adapter System”, proposes a door phone adapter that can prevent erroneous determination when an incoming call is received during a call between an analog telephone and a door phone.

  Here, in the conventional telephone apparatus, the interface of the single telephone and the interface of the door phone are separate interfaces as shown in FIG. 3 and FIG. 4, respectively. It is an obstacle to plan. FIG. 3 is a block diagram showing a single telephone interface of a conventional telephone apparatus. FIG. 4 is a block diagram showing a door phone interface of a conventional telephone device.

  First, the circuit block of the single telephone interface of the telephone apparatus shown in FIG. 3 will be described. As shown in FIG. 3, a telephone device 10A such as a PBX or a key telephone connected to the single telephone 20 includes an Nch power supply circuit 11A, an audio circuit 12A, a control unit 13A, an audio control unit 14A, and a storage unit 15A. Yes.

  The power supply circuit 11A includes a line power supply unit 111A that normally supplies 48V to the single telephone 20, and a power supply monitoring unit 112A that reports the result of monitoring the power supply state to the single telephone 20 to the control unit 13A as power supply information. The audio circuit 12A also receives an A / D conversion unit 121A that performs analog / digital conversion by a PCM CODEC (Pulse Code Modulation Coder / Decoder) control signal from the control unit 13A, and an audio path control signal from the control unit 13A. A voice control unit 14A for transmitting / receiving digital voice data and a call switch 122A for opening / closing a call path between the A / D conversion unit 121A, and the A / D conversion unit 121A includes a PCM CODEC 121Aa that performs AD / DA conversion. And a hybrid circuit 121Ab for 2-wire to 4-wire conversion.

  The control unit 13A monitors the power supply state of each channel and controls the PCM CODEC 121Aa based on the mode of each channel stored in the storage unit 15A (mode such as connection to the single telephone 20 and connection to the door phone 30). The voice path is controlled, and a control signal is output to the A / D converter 12A.

  Here, the single telephone interface of the telephone device 10A has a high power supply voltage (for example, 48V), and when the single telephone 20 is off-hooked, a call current flows, and the power supply monitoring unit 112A of the telephone apparatus 10A detects the off-hook of the single telephone 20 Then, the control unit 13A is notified. Thus, by executing the call control process in the control unit 13A, the single telephone 20 is set in a call state, and voice data is transmitted to and received from the voice control unit 14A via the A / D conversion unit 12A. Note that the impedance in a call state is usually about 600Ω.

  The gain and sidetone adjustment of the audio signal are performed by the analog unit of the A / D conversion unit 121A, converted into digital audio data by the PCM CODEC 121Aa, and the digital audio data is transmitted by the audio control unit 14A.

  Next, a circuit block of the door phone interface of the telephone device shown in FIG. 4 will be described. As shown in FIG. 4, a telephone device 10B such as a PBX or a key telephone connected to the door phone 30 includes an Nch power supply circuit 11B, an audio circuit 12B, a control unit 13B, an audio control unit 14B, and a storage unit 15B. .

  The power supply circuit 11B includes a doorphone power supply unit 111B that normally supplies 10V to the doorphone 30, and a doorphone activation monitoring unit 112B that reports the result of monitoring the power supply state to the doorphone 30 to the control unit 13B as doorphone activation monitoring information. The audio circuit 12B transmits and receives digital audio data by an A / D conversion unit 121B that performs analog / digital conversion by a PCM CODEC control signal from the control unit 13B and an audio path control signal from the control unit 13B. A speech switch 122B for opening and closing a speech path between the voice control unit 14B and the A / D conversion unit 121B. The A / D conversion unit 121B is a PCM CODEC 121Ba that performs AD / DA conversion and a 2-wire to 4-wire conversion The hybrid circuit 121Bb is provided.

  The control unit 13B monitors the activation of each door phone, controls the PCM CODEC, based on the mode of each channel stored in the storage unit 15B (mode such as connection to the single telephone 20 and connection to the door phone 30). The voice path is controlled, and a control signal is output to the A / D converter 12B.

  Here, in the door phone interface of the telephone device 10B, when a visitor presses the call switch of the door phone 30, the current and voltage fluctuate, and the fluctuation is detected by the door phone activation monitoring unit 112B of the telephone device 10B. The device 10B side is notified that there is a call. When calling with a visitor, the call is made with no call current flowing. For this reason, the impedance of the doorphone 30 looks large. Therefore, the processing of the audio signal of the door phone 30 is performed in the same manner as in the case of the single telephone interface, but the analog circuit constants are different.

JP 2000-049954 A (page 3-4)

  As described above, the problem with the prior art is that the single telephone interface and the door phone interface are separate interfaces, which is an obstacle to the added value and space saving of the telephone device. In order to make both of them common interface, it is necessary to adjust the power supply voltage of the single telephone and the doorphone, which are fixed values, and further, depending on the different impedance between the single telephone and the doorphone, The adjustment method when the sound level changes becomes a problem.

  The present invention has been made in view of such problems, and by adding a programmable mechanism for sharing the interface between a single telephone and a door phone, the added value of the single telephone interface is increased, and a key telephone system or An object of the present invention is to provide a telephone device useful for space saving as a PBX system.

  In order to solve the above-described problems, the telephone device according to the present invention employs the following characteristic configuration.

  (1) a power supply circuit that has an interface for connecting at least an analog single telephone and a doorphone, and supplies a power supply voltage to the analog single telephone or the doorphone based on a control signal from a control unit; A telephone device comprising an analog / digital conversion unit for analog-to-digital conversion of audio information between the doorphone, the analog phone and the doorphone are connected to a common interface, and The power supply circuit is configured to switch a power supply voltage for supplying power to the analog single telephone or the doorphone in accordance with a control signal from the control unit that determines which of the analog single telephone and the doorphone is valid. A telephone device equipped with a DC controller.

  According to the telephone device of the present invention, the following effects can be obtained.

  By making the interface of the single telephone and the door phone into one, the added value of the single telephone interface can be increased, and the number of interface units can be reduced, so that the system size can be reduced.

  In addition, the telephone device of the present invention is easy in terms of management because the types of units are reduced.

It is a block block diagram which shows an example of the block configuration of the common interface of the single telephone and doorphone of the telephone apparatus which concerns on this invention. It is a flowchart which shows an example of the setting operation | movement in the telephone apparatus shown in FIG. It is a block diagram which shows the single telephone interface of the conventional telephone apparatus. It is a block diagram which shows the door phone interface of the conventional telephone apparatus.

  Hereinafter, preferred embodiments of a telephone device according to the present invention will be described with reference to the accompanying drawings. The telephone device according to the present invention may be a key telephone, a PBX (Private Branch Exchange), or a telephone device having a plurality of channels for connecting an analog single phone and a door phone. Any device may be used.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. At present, in a telephone apparatus such as a key telephone system and a PBX, an interface between an analog single telephone (hereinafter abbreviated as a single telephone) and a doorphone is set separately. The reason for this is that adjustment of the transmission / reception side tone when different supply voltages and different impedances are connected is an issue and is difficult to share. Therefore, in the present invention, a common interface between the analog telephone and the door phone is realized by adopting a mechanism that can adjust the power supply voltage and the transmission / reception side sound level in a programmable manner.

  In other words, in the present invention, the common supply voltage is realized by adding a DC / DC controller and its peripheral circuit adopting a PWM (Pulse Width Modulation) control method and the like, and transmitting and receiving side sound level. Is characterized in that it can be adjusted to an optimum value by adding a DSP (Digital Signal Processor) function.

(Configuration example of embodiment)
Next, an example of the system configuration of the telephone device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an example of a block configuration of a common interface between a single telephone and a door phone of the telephone device according to the present invention, and FIG. 2 is a flowchart showing an example of a setting operation in the telephone device shown in FIG. It is.

  As shown in FIG. 1, the telephone device 10 includes a power supply circuit 11 composed of Nch, an audio circuit 12, a control unit 13, an audio control unit 14, and a storage unit 15 as in the case of the prior art.

  However, the power feeding circuit 11 is different from the prior art in that the DC / DC controller 111 for adjusting the supplied voltage and the voltage (48V / 10V) from the DC / DC controller 111 are adjusted independently by the voltage adjustment signal from the control unit 13. A line power feeding unit 112 that feeds power to the door phone 30 via the telephone 20 or the overvoltage protection adapter 31, and a power feeding monitoring unit 113 that reports a result of monitoring the power feeding state to the single phone 20 or the door phone 30 to the control unit 13 as power feeding information. The audio circuit 12 also includes an A / D conversion unit 121 that performs analog / digital conversion by digital signal processing in accordance with a DSP (Digital Signal Processor) control signal from the control unit 13, unlike the prior art, and a control. An audio control unit 14 for transmitting and receiving digital audio data in response to an audio path control signal from the unit 13; / And a call switch 122 for opening and closing a speech path between D converter 121.

  The A / D conversion unit 121 includes a DSP 121a that performs AD / DA conversion in a programmable manner based on a DSP control signal from the control unit 13, and a hybrid circuit 121b for 2-wire-4 wire conversion. The DSP 121a not only performs AD / DA conversion in a programmable manner based on a DSP control signal from the control unit 13, but also performs impedance matching (Z matching), sidetone adjustment, and transmission / reception level adjustment.

  The control unit 13 adjusts the voltage to be supplied to each channel based on the mode of each channel stored in the storage unit 15 (mode such as connection with the single telephone 20 and connection with the door phone 30), The power supply state is monitored, the DSP 121a for A / D conversion is controlled, the audio path is controlled, and the control signal is output to the power supply circuit 11 and the A / D converter 12.

  As described above, the telephone device 10 has a mechanism in which the interface between the single telephone 20 and the door phone 30 is made common and the adjustment of the power supply voltage and the transmission / reception side sound level can be changed in a programmable manner. That is, switching between the single telephone mode and the door phone mode is performed in the control unit 13 of the telephone device 10, and at that time, the control unit 13 switches to the respective modes for the power feeding circuit 11 and the DSP 121 a of the A / D conversion unit 12. The appropriate instructions are given.

  When the door phone 30 is connected to one interface shared with the single phone 20, an overvoltage protection adapter 31 is inserted in front of the door phone 30 in order to protect the door phone 30 from the high voltage supplied to the single phone 20. Is done.

  When the two interfaces of the single telephone 20 and the door phone 30 are made common to one interface, as described above, the adjustment of the feeding voltage, the adjustment of the sound level on the receiving side of the telephone, and the correction of the impedance of the terminal (single telephone / door phone) However, the telephone apparatus shown in FIG. 1 employs the following mechanism.

  First, as a mechanism for adjusting the power supply voltage, it is possible to switch the power supply voltage by adding a DC / DC controller 111, and by adopting a PWM control system as a control system of the DC / DC controller 111, Since the pulse width can be freely changed in a programmable manner, various supply voltages can be set.

  Furthermore, as a mechanism for adjusting the sound level on the transmitting / receiving side and correcting the impedance of the terminal (single phone 20 / door phone 30), the A / D converter 121 is adjusted and corrected in a programmable manner by adding a DSP function. It is possible to do. That is, a certain analog signal is converted into linear digital data, and using the linear digital data, the DSP 121a adjusts the transmission / reception side sound level and adjusts the impedance. Thus, since the adjustment can be performed before the PCM conversion, the distortion rate can be improved.

  Next, an example of the mode setting operation in the telephone apparatus 10 shown in FIG. 1 will be described in more detail using the flowchart of FIG.

  First, assuming that the telephone device 10 has 64 channels of 1ch to 64ch, one of the channels is set to either the single telephone mode or the door phone mode (step S1). Next, it is determined to which mode the set channel is set (step S2).

  When the single telephone mode is set (in the case of “single mode” in step S2), the power supply voltage is selected between 20V-50V (usually 48V), and the DC / DC controller 111 via the line power supply unit 112 is selected. Is supplied to the single telephone 20 (step S3). Further, the DSP 121a is controlled to perform impedance matching, sidetone adjustment, and transmission / reception level adjustment. As a result, the single telephone mode is set to a valid state (step S4). Thereafter, the process proceeds to step S7.

  On the other hand, when the doorphone mode is set (in the case of “doorphone mode” in step S2), the power supply voltage is selected from 4V to 15V (normally 10V), and the line power supply unit 112 is connected from the DC / DC controller 111. Then, it supplies to the door phone 30 (step S5). Further, the DSP 121a is controlled to perform impedance matching, sidetone adjustment, and transmission / reception level adjustment. As a result, the door phone mode is set to a valid state (step S6). Thereafter, the process proceeds to step S7.

  In step S7, it is further confirmed whether or not to set another channel (step S7). If another channel is also set ("set" in step S7), the process returns to step S1. The above operation is repeated. On the other hand, when setting of other channels is not performed (in the case of “not set” in step S7), the setting is ended (step S8).

  The setting result of the flowchart of FIG. 2 is stored in the storage unit 15 as the mode information of the single telephone mode / door phone mode of each channel, and the mode stored in the storage unit 15 even when the telephone device 10 is restarted. It is possible to retain information, reset the state according to the mode information, and return to the state before the restart.

  Further, as shown in FIG. 2, the telephone device 10 such as a key telephone system or PBX has a plurality of interfaces for connecting the single telephone 20 and the door phone 30 in common, and the interface for accommodating the single telephone 20 and the door phone 30. Can be set to multiple channels, and the setting can be performed for each channel.

  Furthermore, since all the channel modes can be switched by software using the DC / DC controller 111 and the DSP 121a, the system configuration will be easy to use in the future.

  Further, if the doorphone 30 is connected by mistake when it is set to the single telephone mode, the problem that the doorphone 30 breaks down occurs. Therefore, as described above, the failure of the door phone 30 is avoided by connecting the overvoltage protection adapter 31 to the front stage of the door phone 30.

(Explanation of effect of embodiment)
According to the telephone device 10 of the present embodiment, the following effects can be obtained.

  By making the interface between the single telephone 20 and the door phone 30 one, it is possible to increase the added value of the single telephone interface, and it is possible to reduce the number of interface units, thereby reducing the system size. .

  Also, the telephone device 10 is easy in terms of management because the number of types of units is reduced.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) The telephone apparatus according to (1), wherein PWM (Pulse Width Modulation) control is used as a control method for controlling the DC / DC controller.
(3) The analog / digital conversion unit is connected to the analog single phone or the door phone according to a control signal from the control unit that determines which of the analog single phone and the door phone is valid. The telephone apparatus according to (1) or (2), further including a DSP (Digital Signal Processor) that performs analog / digital conversion of the voice information and performs impedance matching, sidetone adjustment, and transmission / reception level adjustment.
(4) The telephone device according to any one of (1) to (3), wherein an overvoltage protection adapter is connected to a front stage of the doorphone when the analog single telephone and the doorphone are connected to one common interface.
(5) The control unit includes a storage unit that stores mode information that determines which of the analog single telephone and the door phone is valid, and stores the mode information in the storage unit even when the telephone device is restarted. The telephone device according to any one of (1) to (4), wherein the mode information stored can be retained and reset to a state based on the mode information.
(6) The telephone device according to any one of (1) to (5), wherein a plurality of the interfaces for commonly connecting the analog single telephone and the door phone are provided.
(7) The telephone device according to any one of (1) to (6), wherein the telephone device is either a key telephone system or a PBX (Private Branch Exchange).

DESCRIPTION OF SYMBOLS 10 Telephone apparatus 10A Telephone apparatus 10B Telephone apparatus 11 Feeding circuit 11A Feeding circuit 11B Feeding circuit 12 Audio circuit 12A Audio circuit 12B Audio circuit 13 Control part 13A Control part 13B Control part 14 Voice control part 14A Voice control part 14B Voice control part 15 Storage Unit 15A Storage unit 15B Storage unit 20 Single phone 30 Doorphone 31 Overvoltage protection adapter 111 DC / DC controller 111A Line power supply unit 111B Doorphone power supply unit 112 Line power supply unit 112A Power supply monitoring unit 112B Doorphone activation monitoring unit 113 Power supply monitoring unit 121 A / D Conversion unit 121A A / D conversion unit 121a DSP
121B A / D converter 121b Hybrid circuit 121Aa PCM CODEC
121Ab Hybrid Circuit 121Ba PCM CODEC
121Bb Hybrid circuit 122 Call switch 122A Call switch 122B Call switch

Claims (7)

  A power supply circuit that has an interface for connecting at least an analog single telephone and a doorphone, and supplies a power supply voltage to the analog single telephone or the doorphone based on a control signal from a control unit, and the analog single telephone or the doorphone. A telephone device comprising an analog / digital converter for analog-to-digital conversion of voice information between the analog phone and the door phone connected to a common interface, and the power supply circuit comprises: A DC / DC controller that switches a power supply voltage for supplying power to the analog single telephone or the doorphone in accordance with a control signal from the control unit that determines which of the analog single telephone and the doorphone is valid A telephone device comprising:   2. The telephone apparatus according to claim 1, wherein PWM (Pulse Width Modulation) control is used as a control method for controlling the DC / DC controller.   The analog / digital conversion unit determines whether the analog single phone or the door phone is valid, and the voice information between the analog single phone or the door phone is determined according to a control signal from the control unit. The telephone apparatus according to claim 1, further comprising a DSP (Digital Signal Processor) that performs analog-to-digital conversion and performs impedance matching, sidetone adjustment, and transmission / reception level adjustment.   4. The telephone device according to claim 1, wherein an overvoltage protection adapter is connected to a front stage of the doorphone when the analog single telephone and the doorphone are connected to one common interface. 5. .   The control unit includes a storage unit that stores mode information that determines which of the analog single telephone and the doorphone is valid, and the storage unit stores the mode information even when the telephone device is restarted. 5. The telephone apparatus according to claim 1, wherein the telephone apparatus is capable of holding mode information and resetting the state according to the mode information.   6. The telephone device according to claim 1, wherein a plurality of the interfaces for commonly connecting the analog single telephone and the door phone are provided.   7. The telephone apparatus according to claim 1, wherein the telephone apparatus is a key telephone system or a PBX (Private Branch Exchange).

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