JP2642726B2 - Hands-free communication device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free communication device used in a simple telephone exchange system for switching connections between external lines and internal lines or between internal lines.

[Prior Art] The configuration of a conventional telephone exchange system is shown in FIG. In this telephone switching system, with a telephone exchange A is connected to the telephone office E through the protective device and the switching division unit in external l _1, a plurality of telephone inside wire made of extension l ₂ and the control line l ₃ Metropolitan outlet B is connected to the telephone exchange a, further intercom D in call line l ₄ is connected to the telephone exchange a.

Each telephone outlet B is provided with a modular jack M, and a general commercial telephone C is connected to the telephone outlet B by the modular jack M. With this the telephone outlet B incorporating the speaker SP ₁ for reproducing an audio signal transmitted through the control line l _3, displays the discriminating voltage signal transmitted through the control line l ₃ Are provided.

By the way, the telephone outlet B can receive various kinds of calls, but if the telephone C is not connected,
There was a problem that the call could not be answered.

Therefore, it has been considered to install a hands-free communication device in place of the telephone outlet B, and to provide a function switch for holding or paging at the hands-free communication device so that it can answer the call. Was.

[Problems to be Solved by the Invention] However, when the hands-free communication device is provided in place of the telephone outlet B as described above, there is a problem that the telephone call using the telephone C cannot be performed.

Also, in the case of an extension call or the like in a conventional hands-free communication device, a call cannot be made unless a call switch provided in the hands-free communication device is pressed. Therefore, a person who cannot move, such as a sick person, cannot make a call.

The invention of claim 1 has been made in view of the above points, and an object of the invention is to provide a telephone exchange system capable of performing both a call using a handset and a hands-free call. .

Another object of the present invention is to provide a hands-free communication device that enables automatic communication without pressing a call switch.

[Means for Solving the Problems] In order to achieve the above object, the invention according to claim 1 according to the present invention relates to an internal / external communication in response to an internal / external line call or an internal call which is transmitted from a telephone exchange via a control line. Notification means for displaying a line call or sounding a notification sound, a hands-free communication circuit for hands-free internal / external communication, a modular jack to which a telephone is connected, and the above-mentioned hand-free communication circuit and modular jack. A switching circuit for connecting to an internal line, off-hook detecting means for detecting that a telephone connected to the modular jack is off-hook, and operated when performing various operations such as hands-free call, external line hold and general call. A plurality of function switches, an off-hook detection output of the off-hook detection means, and switching control of the switching circuit in accordance with the operation of the function switches, thereby controlling Control means for switching between a free call and a handset call, and sending a command for an operation corresponding to the function switch when the function switch for holding an outside line and paging is operated to the telephone exchange through an extension by a dial signal when the function switch for the external line hold and general call is operated. ing.

In order to achieve the above object, the invention according to claim 2 is a method for displaying or notifying an internal / external call according to a notification signal corresponding to an internal / external call or an internal call sent from a telephone exchange via a control line. A notification means for emitting a sound, a hands-free communication circuit for performing a free-to-external call, an extension call detection circuit for detecting an extension call sound generated by the notification means, and an extension call detection circuit. DC closing means for closing the DC circuit of the hands-free communication circuit with the output.

[Operation] According to the first aspect of the present invention, the hands-free communication device is provided with a modular jack as described above so that the telephone can be connected to the hands-free communication device, and the control means controls the off-hook detection output of the off-hook detection means. By switching the switching circuit in accordance with the operation of the function switch to switch between the hand-free call and the handset call, both the hand-free call and the handset call are made possible.

According to the second aspect of the present invention, when an extension call is detected by the extension call detection circuit, the DC circuit of the hands-free communication circuit is closed by the DC closing means, so that when an extension is called, the hands-free communication is automatically performed. The circuit is connected to an extension so that a hands-free call can be made without pressing the call switch of the hands-free call device.

Embodiment 1 As shown in FIG. 3, a telephone exchange A of this telephone exchange system has relay contacts r _{1 to} r ₃ , hook / DP for each telephone C.
Provided with a (dial pulse) detection circuit 2 ₁ to 2 ₃ and speech current supply circuit ₄₁ to _3, an incoming detecting circuit 5 for detecting an incoming call from an outside line l _1, to generate the DP for performing external call DP
Generating circuit 6, PB dialer 7 for performing PB (push button) dialing, external line tone detecting circuit 8 for detecting external line tone, hold tone sending circuit 9 for sending hold tone, cross-point switch for setting communication path 10, CP performing PB receiver 12 for receiving the PB signal of the AC coupling paths, a diode bridge DB, the gate G ₁ ~G _3, and the transmission control and signal determination processing of the control information signals of each circuit and later circuitry
And a control circuit 11 composed of U.

In the telephone exchange A, the telephone C can communicate with the two intercoms D. Therefore, the intercom call detection circuits 14 ₁ and 14 ₂ for detecting a call from the intercom D are provided. And a door phone communication circuit 15. A security device and an emergency push button can be further connected to the telephone exchange A. Therefore, when a security signal of the security device is input or when the emergency push button is pressed, the telephone outlet B is connected. from the speaker SP ₁ are adapted to emit an alarm sound.
In addition, when a security signal is output from the security device or when an emergency push button is pressed, a notification sound is emitted from the telephone outlet B to which each telephone C is connected. sound generating circuit 17 for generating a sound, an amplifier aMP ₁ ~AMP _4. In addition, a display control circuit 18 is provided to display the state of the outside line call and the inside line call at the telephone outlet B.

The operation of the telephone exchange system will be described. In the telephone exchange A, when the power is turned on and the system starts, first, the control circuit 11 including a one-chip microcomputer performs an initial setting, then enters a standby state, determines off-hook, and determines whether there is an incoming external line. Judgment and outside line call processing, judgment of the presence / absence of intercom call and intercom call processing, judgment of the presence / absence of extension call, extension call processing, external line call processing, etc. are performed.

Now, when the handset of the telephone C connected to any telephone outlet B is lifted, the hook / DP detection circuit 2 detects off-hook and outputs a detection signal to the control circuit 11. In the above state, the relay contacts r _{1 to} r ₃ are switched to the cross point switch 10 side. At this time, the control circuit 11 is a cross-point switch 10 a pseudo calling signal consisting of 400Hz by turning on a predetermined switch of the cross point switch 10 through the gate G ₃ to the telephone outlet B
And sending through the extension l _2. At the same time, the control circuit 11
Controls the display control circuit 18 to output a voltage signal for turning on the light-emitting display unit La for outside-line busy display at each current outlet B, thereby turning on the light-emitting display unit La. At this time, the light emitting surface part Lb is controlled to be turned off.

This transmission continues until the dial signal is input, and when the first dial signal is detected by the hook / DP detection circuit 2,
The control circuit 11 stops outputting the pseudo transmission signal and stores the dial data in the built-in buffer memory. And built-in 3
Activate the second timer. If the second dial signal is detected during the operation of this timer, it is determined that an outside line call has been made. If the second dial signal is not input within three seconds, it is determined that the call is an extension call, and the extension call processing is performed.

Now, in the case of an outside line call, the data of the dial signal inputted subsequently to the buffer memory is sequentially stored and a signal for operating the DC closing circuit 3 is output. When the line is closed by the DC closing circuit 3, the outside line tone detection circuit 8 detects the outside line tone, and the detection signal is sent to the control circuit 11.
It is input to the control circuit 11 sequentially reads from the first dial data stored in the buffer memory, and sends the sequential dialing signals to operate the dial pulse generating circuit 6 to the external line l _1. At the same time, the data of the dial signal input from the telephone C is stored in the buffer memory. Thus at the same time stores the dial data from the phone C in the buffer memory and sending a dial signal to the external line l ₁ in. When the dial data stored in the buffer memory is exhausted and a certain period of time has elapsed, the operation shifts to an external call. Note that interrupts the circuit closing when sending a dial signal to the outside line l _1.

Thereafter, external calls is coupling transformer T, the cross point switch 10, takes place via the extension l _2.

Next, the operation at the time of calling an extension will be described. First, the telephone C connected to the telephone outlet B with the first dial signal
If the next dial signal is not input within 3 seconds after the pseudo-call signal is output from the terminal, the input dial data is determined to be an extension number, and the control circuit 11 cross-points from off-hook to on. a predetermined switch of the switch 10 turns off, with disconnecting the external line l _1,
Turn on another predetermined switch so as to set the speech path to extension l _2. Then, the light-emitting display unit La of each telephone outlet B, which was turned on from off-hook, is turned off, and at the same time, a voltage signal for turning on the light-emitting display unit Lb indicating that the extension is busy is output from the display control circuit 18, and the light-emitting display unit Lb is turned on. Light. Further, the control circuit 11 controls the sound generation circuit 17 to output a voice signal for an extension call. The audio signal is superimposed transmitted to the control line l ₃ of telephone outlet B of the caller through the further switch of the cross point switch 10. From telephone outlet speaker SP ₁ B, sent via the control line l ₃ to Hatsuna extension ringing tone. When the handset of telephone C connected to telephone outlet B is picked up by this sound, hook / DP detection circuit 2 detects the off-hook and sends a detection signal to control circuit 11. The control circuit 11 stops the generation of the voice signal based on the off-hook, turns on another switch of the cross point switch 10, and turns on the extension of the telephone outlet B that called.
the call state and connects the extension l ₂ of telephone outlet B of l ₂ and callee. Thereafter, extension calls are performed. It should be noted that, in the case of simultaneous calls Hatsuna make a call sound from the speaker SP ₁ of each telephone outlet B. A dial signal for specifying the general call is input from the telephone C to perform the call.

Next, an incoming call from an outside line will be described. First, when the incoming signal from the external line l ₁ is input, the incoming signal is an incoming call detection circuit 5 detects and outputs an incoming call detection signal to the control circuit 11.
The control circuit 11 when the incoming call detection circuit is inputted, switches the relay contacts r external line l ₁ side. Thus, telephone C connected to each telephone outlet B is connected to the line l ₁ through extension l _2, so that the internal bell sounding in each phone C. When the handset of the telephone C connected to the telephone outlet B is raised by the ringing, the off-hook state is detected by the hook / DP detection circuit 2, and the detection output turns on the control circuit 11 and the DC closing circuit 3 by the detection output. At the same time switching the cross point switch 10, telephone outlet B which is connected to the phone C that is outside line l ₁ and the off-hook
Enabling external call by connecting the extension l _2.

By the way, when the user wants to make an extension call during the above-mentioned outside line call or wants to make a door phone call, the call can be put on hold.

First, when the handset of the telephone C is not on-hook and a dial signal corresponding to the hold, for example, "0" is sent from the telephone C in advance in a DC closed state during an external call, the control circuit 11 transmits the dial data. read it is determined that the hold operation, performs hold processing to release the communication path between the extension l ₂ and external l _1. Then, by operating the holding tone generating circuit 9 by switching the cross point switch 10, the external line l ₁ a holding tone melody signal through a coupling transformer T and amplifier AM
P _4, the cross point switch 10, and sends to the control line l ₃ through an amplifier AMP ₁ ~AMP _3. Further, the control circuit emitting display unit from the display control circuit 18 under the control of 11 La, Lb simultaneously lighted to each telephone outlet a voltage signal via the control line l ₃ B
To turn on the light-emitting display units La and Lb. That know that the holding tone melody signal is pending through the outside line l ₁ to the other party of the phone C, used to play Hatsuna hold melody from the speaker SP ₁ of a telephone outlet B which is connected to each phone C simultaneously The user is informed of the suspension, and at the same time, the light emission display sections La and Lb are simultaneously lit to indicate that the suspension is being performed.

After the hold, even if the telephone C is hooked on and the communication ends, the DC closing circuit 3 is maintained in the on state, and the operation shifts to a calling operation.

Next, when the user wants to make an outside call again, the hold is released. This hold release is performed by any of the telephones C that went off-hook.
It is sufficient to transmit a dial signal of "0", and the control circuit 11 which has detected the dial data of "0" stops the operation of the hold tone generating unit 9 and controls each unit to the original outside line communication state. . When the call after releasing the hold is ended and the telephone C in the off-hook state is again on-hook, the DC closing by the DC closing circuit 3 is released under the control of the control circuit 11.

When the dial data to be inputted is other than "7" for specifying a door phone call after the above-mentioned hold state, the extension number is connected to the telephone outlet B by the above-described extension processing as an extension call.

Hereinafter, a case where a door phone call is made will be described.
When a call is made from the door phone D, a push button provided on the door phone D is pressed. When this push button is pressed, a signal indicating that the impedance has changed in the intercom call detection circuit 14 is output to the control circuit 11. The control circuit 11 determines from the output that the call is from the door phone D, activates the sound generation circuit 17, performs predetermined switching of the crosspoint switch 10, sends a ringing sound to each telephone outlet B, and Hatsuna make a call sound from the speaker SP ₁ of B. Then, when the household member who hears the ringing tone picks up the handset of one of the telephone sets C, the hook / DP detection circuit 2 of the telephone outlet B to which the handset is off-hook is set.
Is sent to the control circuit 11, and the control circuit 11 switches the crosspoint switch 10 to connect the telephone C with which the handset is off-hook to the intercom circuit 15, and intercom the intercom D and the intercom. The switch element S provided between the communication circuit 15 is turned on to enable door phone communication.

Above, the case where the telephone outlet B is connected to the extension l ₂ and the control line l ₃ of the telephone exchange A has been described.
In this embodiment, a hands-free communication device F shown in FIG. The hands-free communication device F includes a modular jack M for connecting a telephone C, and a switch for broadcast, hold, and call.
And a SW ₁ ~SW _3.

FIG. 2 shows a circuit configuration of the hands-free communication device F. This hands-free communication device F is provided for performing a hands-free call, and is provided with a known hands-free communication circuit 21.
If, from the telephone exchange A extension l ₂ is connected, the modular jack M and hands-free speech circuit 21 switching circuit 22 for switching to connect to any of the of the extension l ₂ telephone C is connected, the telephone C off-hook detection circuit 23 for detecting the off-hook, the output and the switching control and control for call control of the hands-free speech circuit 21 of the switching circuit 22 in response to the operation of each function switch SW ₁ to SW ₃ of the off-hook detection circuit 23 a circuit 24, connected to the control line l ₃ of the telephone exchange a, are constituted by a broadcast circuit 25 for notification operation such as output from the speaker SP ₁ reproduces the audio signal of telephone outlet B.

The operation when the telephone C is connected to the modular jack M of the hands-free communication device F will be described. Assuming that the telephone C is now off-hook, the off-hook state of the telephone C is detected by the off-hook detecting circuit 23, and the control circuit 24 controls the switching circuit 22 based on the detection output, and the extension l ₂
Is connected to the telephone C. For this reason, a telephone call by telephone C, that is, a handset telephone call is possible. Note that the switching circuit 22 normally switches to the telephone C side,
The off-hook of the telephone C can be detected.

Also, if any of the function switch SW ₁ to SW ₃ is pressed, together with the connecting extension l ₂ to hands-free speech circuit 21, a control signal to close the series circuit comprising a hands-free call circuit 21 send. Therefore, hands-free communication is possible.

Here, when the function switches SW ₁ and SW ₂ for simultaneous broadcasting and holding are pressed, the control circuit 24 operates the function switches SW ₁ and SW _2.
Send a dial pulse or a PB signal to the telephone exchange A via the extension l ₂ corresponding to. In this case, transmission of a dial pulse or the like is performed by turning the switching circuit 22 on and off. Since the present embodiment, the modular jack M to connect the telephone C in hands-free device F is provided, it is to choose freely connect the extension l ₂ to telephone C and hands-free call circuit 21, the handset You can make both phone calls and hands-free calls. Moreover, by pressing the function switches SW ₁ and SW ₂ , simultaneous broadcasting and holding can be performed, which is convenient. In other words, conventionally, when performing simultaneous broadcast or hold, a specific dial signal must be input on the telephone C, and at this time, the user must associate a desired operation with the dial signal (for example, “hold” → “hold”). 0 "or" broadcast "→" 9 "). However, in this embodiment, since each operation corresponds to one switch on a one-to-one basis, it becomes easy to handle.

Second Embodiment FIG. 4 shows an embodiment of the second aspect of the present invention. In this embodiment, when there is an extension call from another telephone C, without pressing the talk switch SW ₃ of the hands-free talk apparatus F,
It is designed to enable hands-free communication. For this reason, the hands-free communication device F of this embodiment includes an extension call detection circuit 26 for detecting an extension call, and a hands-free communication circuit in accordance with the output of the extension call detection circuit 26.
And a control circuit 27 which connects the 21 to extension l _2. In the extension call detection circuit 26, a call signal sent through the control line l ₃ detects reporting circuit 25, when the notification circuit 25 is Hatsuna a ringing tone from the speaker SP _1, It is so as to detect an extension call by detecting a calling tone of the speaker SP _1. Since this ringing tone is a signal (for example, a sound such as a pop-up sound) which usually has a single frequency intermittently for a certain period and a certain cycle, it can be easily detected by a band-pass filter or the like.

In the present embodiment, when another telephone C inputs a dial signal specifying this hands-free communication device F, the operation of the telephone exchange A described above causes the hands-free communication device F to operate.
There ringing signal is sent to the connected control line l _3, and at the same time Hatsuna a ringing tone from the speaker SP ₁ this call signal is detected by the reporting circuit 25, hands-free conversation becomes automatically possible. Therefore, it is a useful device especially for a sick person or the like who cannot move even when receiving an extension call, and the person who called the hands-free communication device F has a sound collected through the microphone MC of the hands-free communication device F. There is also an advantage that the situation of the other party can be easily grasped. It should be noted that an off switch SW which is operated to automatically turn off the function for automatically setting the hands-free communication as shown in FIG.
₄ is provided, but if used as a constantly automatically hands-free call this switch SW ₄ is not required.

[Effect of the Invention] As described above, the invention of claim 1 includes the modular jack to which the telephone is connected, so that the telephone can be connected to the hands-free communication device, and the control means can control the off-hook detection means. The switching between the hands-free call and the handset call is performed by controlling the switching circuit in accordance with the off-hook detection output and the operation of the function switch, so that there is an advantage that both the hands-free call and the handset call are possible. Furthermore, since the hands-free communication device is provided with a function switch corresponding to outside line hold or general call, there is no need to store the above functions and the corresponding dial numbers as in the related art, so that the function operation can be easily performed. There is also.

According to the second aspect of the present invention, the DC circuit of the hand-free communication circuit is closed by the DC closing means when the extension ringing sound is detected by the extension call detection circuit. The circuit is connected to the extension, so that hands-free communication can be performed without pressing the call switch of the hands-free communication device, which is convenient for people who cannot move, such as sick people. There is also an advantage that the situation on the hand-free communication device side can be determined from the sound collected by the microphone of the free communication device.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of an embodiment of the first aspect of the present invention, FIG. 2 is a block diagram showing a circuit configuration of the same, FIG. 3 is a block diagram showing a circuit configuration of a telephone exchange, and FIG. Is a block diagram showing a circuit configuration of another embodiment, and FIG. 5 is a configuration diagram of a telephone exchange system. A is a telephone exchange, F is a hand-free communication device, M is a modular jack, SW _{1 to} SW ₃ are function switches, 21 is a hand-free communication circuit, 22 is a switching circuit, 23 is an off-hook detection circuit, 24 is a control circuit, 25 Is a notification circuit.

Claims (2)

(57) [Claims] 1. A hand-free communication device connected to an extension and a control line from a telephone exchange for switching connection between an outside line and an extension or between extensions. Means for displaying an internal / external line call and sounding a notification sound in response to a notification signal corresponding to an internal call or an extension call, a hands-free communication circuit for performing a free / internal / external call, and a modular to which a telephone is connected. A jack, a switching circuit for selectively connecting the hands-free communication circuit and the modular jack to an extension, off-hook detection means for detecting that a telephone connected to the modular jack is off-hook, A plurality of function switches which are operated when performing various operations such as a paging call; an off-hook detection output of the off-hook detection means; In response to the operation of the switch, the switching circuit is controlled to switch between a hands-free call and a handset call, and when an external line hold and general call function switch is operated, an operation corresponding to the function switch is performed. Control means for sending a command to the telephone exchange via an extension by a dial signal. 2. A hands-free communication device connected to an extension and a control line from a telephone exchange for switching the connection between an outside line and an extension or between extensions. Means for displaying an internal / external line call and sounding a notification sound in response to a notification signal corresponding to a call or an extension call, a hand-free communication circuit for performing a free-to-use internal / external call, and sounding by the notification means. A hand-free communication device comprising: an extension call detection circuit for detecting an extension call sound to be received; and a DC closing means for closing a DC circuit of the hand-free communication circuit by an output of the extension call detection circuit.