JPH01154663A - Telephone terminal equipment for switching handset and speaker phone talking - Google Patents

Abstract

PURPOSE:To eliminate the need for an individual switch for changeover of handset speaker phone call by using a signal detecting whether or not a plug is inserted to a jack connecting to a handset so as to control a switching element. CONSTITUTION:A light from a light emitting element 3 of a photomark sensor 2 of a modular jack 1 is irradiated to the receptacle of a modular plug (not shown) provided on a handset from an opening section 5. When the modular plug is plugged in, the projecting light is reflected and made incident on a light receiving element 4 and then detected. The output of the photomark sensor 2 is connected to a transistor switch 10 tying lines 12a, 12b connecting to a speaker phone circuit 8 and an exchange and then connected to a transistor switch 11 connecting the speech network circuit 9 and the lines 12a, 12b. Thus, either the transistors 11, 12 is turned on and the other is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a handset/speakerphone call switching telephone terminal device.

[Conventional technology]

Conventionally, when changing calls for woodcutter, a switch was installed that was mechanically linked to the hook switch that was activated when the handset was raised or lowered, and when the handset was lowered, pressing the speakerphone switch switched between the speakerphone circuit and the telephone line (line). ), and when the handset is raised, the speech network circuit is connected to the line, and if the speakerphone switch is pressed, it is released and the speakerphone circuit is disconnected from the line. . In addition, a hook switch and a speakerphone switch are provided independently, and each switch can be turned on or off.
When the off state is detected, a control circuit causes a relay or an electronic switch to perform the above-mentioned operations. In addition, with small terminal devices that have a built-in telephone, it is not possible to incorporate the handset into the device due to the shape, and there is no hook switch that operates by raising and lowering the handset. A switch is provided to select whether to connect the line to the line, and this is done by operating the switch.

[Problem that the invention seeks to solve]

However, even telephones designed primarily for use with speakerphones are provided with a hook switch that operates by raising and lowering the handset for handset calls, and the handset is incorporated into the main body, resulting in a large external size. In addition, small terminal devices, especially devices that are portable, may be
If you cannot incorporate a handset into the phone, and you have to operate a changeover switch after connecting it with a modular connector if necessary, and if you connect the handset with the modular connector if necessary with the above-mentioned telephone, Although the main body is smaller, similar operations are required and the operations are complicated.

[Means for solving problems]

The present invention provides a handset/speakerphone call switching telephone terminal device that does not include a hook switch that responds to raising and lowering the handset, and in which the handset can be attached and detached by connecting and disconnecting the jack and the plug; and a first means for respectively outputting a first signal and a second signal in response to the dissociation; and a first means for connecting the means for making a handset conversation to a telephone line in response to the first signal from the first means. a third means for connecting a means for making a speakerphone call to the telephone line in response to the second signal from the first means;
and the means for

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to FIGS. 1, 2, and 3 showing one embodiment of the present invention, a photo mark sensor 2 is installed on the back of a modular jack 1 provided in a handset/speakerphone call switching telephone terminal device (main body). Built-in. The photomark sensor 2 has a built-in light emitting element 3 and a light receiving element 4. The light from the light emitting element 3 is irradiated from the opening 5 on the back of the modular jack 1 toward the insertion part of a modular plug (not shown) provided in the handset, but the modular plug is not inserted. Sometimes, the light is not reflected and therefore does not enter the light receiving element 4. Further, when the modular plug is inserted, the irradiated light is reflected and enters the light receiving element 4 and is detected. The output of the photomark sensor 2 is input to a tamenicon valator 6 from which noise and the like are removed. The output of the comparator 6 is connected to a transistor switch 10 that connects a speakerphone circuit 8 to lines 12a and 12b connected to the exchange, and a transistor switch 11 that connects a speech network circuit 9 and lines 12a and 12b via an inverter 7. connected to. Therefore, one of the transistor switches 10.11 is on and the other is off. The output of the photo mark sensor 2 is at ground level when no reflected light is detected (when the modular plug is not inserted into the modular jack 1), but there is an output due to noise. On the other hand, when the reflected light is being detected (when the modular plug is inserted into jack 1), it is at the power supply voltage level, but the level goes up and down somewhat due to noise and the like. By applying an appropriate threshold voltage VTH to the (-) input of the comparator 6, a stable output without the influence of noise can be obtained. When the photomark sensor 2 is not detecting reflected light, the output of the comparator 6 is at ground level, the transistor switch 10 is on, the transistor switch 11 is off, and the speakerphone circuit 8 is connected to the line 12a.

12b, it is possible to use a speakerphone. On the other hand, when the reflected light is detected, the output of the comparator 6 is at the power supply voltage level, the transistor switch 10 is in the off state, the transistor switch 11 is in the on state, and the speech network circuit 9 is connected to the lines 12a and 1.
2b to enable handset calls. In addition, in FIG. 1, 13 is a diode bridge circuit;
4 is a switch that is turned on when this telephone terminal device is in use.

FIG. 4 shows a modification of the seven modular jack 1 shown in FIG. The granger 13 inserted into the modular plug insertion part is pressed, and the button switch 12 is pressed.
By turning on... it is possible to detect a handset connection.

In the above embodiment, the detection mechanism was built into the back surface of the modular jack 1, but it may be built into any surface other than the modular plug insertion opening.

〔Effect of the invention〕

As explained above, according to the present invention, a mechanism for detecting whether or not a plug is inserted into a jack for connecting a node set is incorporated, and the output signal is used to connect the speakerphone circuit and speech network circuit to the line. By controlling the switching element in the main unit, when the handset plug is inserted into the jack on the main unit, it becomes a handset call state, and when it is unplugged, it goes into a speakerphone call state, eliminating the need for a separate switch to switch between handset and speakerphone calls. There is no need to operate and there is no need to be aware of switching, making it easier to use. Furthermore, if the device is mainly used for speakerphone calls, there is no need to integrate the handset and the device can be made smaller.

[Brief explanation of the drawing]

1, 2, and 3 are views showing an embodiment of the present invention, and FIG. 4 is a view showing a modification of the modular jack shown in FIG. 2. 1...Modular jack, 2...Photomark sensor, 3...Light emitting element, 4...
...Light receiving element, 5...Aperture L 6...
・Comparator, 7... Inverter, 8...
... Speakerphone circuit, 9 ... Speech network circuit, 10.11 ... Transistor switch, 12a, 12b ... Telephone line, 12.
...Mechanical bushing switch, 13...
Plunger. Agent Patent Attorney Uchihara Oto ■ 1 Figure 2 Figure 4

Claims (1)

[Scope of Claims] In a handset/speakerphone call switching telephone terminal device that does not include a hook switch that responds to raising and lowering the handset, and in which the handset can be attached and detached by connecting and disconnecting the jack and the plug: The jack and the plug first means for respectively outputting a first signal and a second signal in response to coupling and dissociation from said first means; means for causing a telephone line to perform a handset conversation in response to said first signal from said first means; A second means for connecting; and a third means for connecting a means for making a speakerphone call to the telephone line in response to the second signal from the first means. Handset/speakerphone call switching telephone terminal device.