JPH0218640B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a button telephone device, and its purpose is to control the ON state of a talkback microphone,
The object is to provide something that can distinguish and display three states: OFF state and operating state. The above-mentioned talkback is a method of making calls without using the handset of the telephone, and the voice of the other party is heard through the speaker installed in the telephone.
This is a system in which calls are made using a microphone mounted on the telephone. Conventionally, some key telephone devices of this type are designed to improve operability by automatically activating a talkback microphone when a call is received from the other party, allowing the user to immediately begin a call. However, in this case, although the operability is improved, since the talkback microphone is automatically activated, there is a possibility that the other party can eavesdrop on your sound. Therefore, the talkback microphone is equipped with a switch or an operation display is provided to inform the operator of the status of the talkback microphone. Conventionally, the following methods have been used to display the status of talkback microphones. Displayed according to the state of the push button of the Γ lock switch (manual operation manual reset push button switch). For example, in this case, if the push button is pressed, the talkback microphone is ON, and if the push button is returned, the talkback microphone is ON. You can confirm that the talkback microphone is turned off. A light emitting indicator such as a Γ lamp indicates that the talkback microphone is ON when the lamp is on, and that the talkback microphone is OFF when the lamp is off. However, in both of the above two methods, although it is possible to check the ON and OFF states of the talkback microphone, it is not possible to tell whether the talkback microphone is working or not, resulting in poor operability. Therefore, the present invention avoids the above problems by providing a display device that selects three types of display states according to the talkback standby mode, the talkback call mode, and the talkback microphone off mode. An example will be described based on the drawings. 1 is a talkback circuit that allows standby calls;
2 is a talkback microphone, 3 is a receiver speaker,
4 is the status display lamp of the talkback microphone 2,
Reference numerals 5 and 6 are amplifiers, and SW ₁ and SW ₂ are first and second switches that are switched in conjunction with each other, and act as an on/off switch for the talkback microphone 2. SW ₃ and SW ₄ are third and fourth switches that are switched in conjunction with each other and function as a handset/talkback switch. 7 is a square wave oscillator, 8 is a hybrid transformer, 9 is an OR gate, 10 is an AND gate, 11 is a connection line to a telephone network using an ordinary handset, and 12 is for controlling the connection between the telephone and the telephone line, etc. This is the connection line to the main device in charge. In the drawing, the first and second switches SW ₁ and SW ₂ are in the ON state switching state of the talkback microphone 2, and the third and fourth switches SW ₃ ,
SW ₄ is in the handset talking switching state. In the switching state shown in this drawing, the handset is in a call mode, and the status indicator lamp 4 is in a lit state. In other words, in the state of the drawing, AND gate 1
One input of the AND gate ₁₀ is connected to the logic level "H" through the second switch SW 2, and the other input of the AND gate 10 is connected to the logic level "H" through the OR gate 9 and the fourth switch SW ₄ . Since it is connected to "H", the status display lamp 4 is turned on. Next, when the first and second switches SW ₁ and SW ₂ are left as they are and only the third and fourth switches SW ₃ and SW ₄ are switched to the talkback side to set the talkback call mode, one input of the OR gate 9 becomes Fourth
The output of the OR gate ₉ changes to the logic level "H" and "L" at a predetermined period according to the output signal of the square wave oscillator 7. Therefore, the other input of the AND gate 10 is at logic level "H",
Since it changes to "L", the status display lamp 4 blinks at the output signal period of the rectangular wave oscillator 7. moreover,
In this state, when the first and second switches SW ₁ and SW ₂ are switched to the "I" side to set the talkback microphone off mode, the talkback microphone 2 is turned off, and the one input of the AND gate 10 goes to the logic level. Since the signal is reversed to "L", the status display lamp 4 is turned off. The above can be summarized as shown in the table below.

[Table] Since the display changes to three types depending on the mode: off, on, and flashing, the user can check when the talkback microphone 2 is working by checking the status display lamp 4. You'll know who's there, and you won't have to worry about your conversations being intercepted. Note that the combinations of the states of the talkback microphone 2 and the status display lamp 4 are not limited to those shown in the table above, and similar effects can be obtained with other combinations. Further, in the above embodiment, a display device and a lamp were used, but a light emitting diode or the like may also be used. As explained above, according to the present invention, there is a changeover switch that switches and connects the connection line to the main device to the telephone network side and the talkback hybrid transformer side, respectively, and the changeover switch is connected to the hybrid transformer side. When a talkback microphone and a telephone receiver are respectively connected to the connection line to the main device via the hybrid transformer, and the microphone is connected between the microphone and the hybrid transformer, the microphone is optionally connected to the hybrid transformer. A handset call mode that uses the handset connected to the telephone network, a talkback call mode that uses both the microphone and the handset, and It is configured so that three states can be selected, including a talkback microphone off mode in which only the handset is used, and a state detection system that detects which of the three states it is in and outputs a different signal depending on the detected state. By providing a single display that displays different information depending on the output of the state detection means, it is possible to easily recognize the state of the talkback microphone, and it is possible to easily recognize the state of the talkback microphone when the other party calls you while in the talkback mode. ,
Even if you do not notice it, you can easily notice it by the display on the display, and this has the advantage of preventing a situation where the other party overhears what you are saying.

[Brief explanation of drawings]

The drawing shows a main part configuration diagram of an embodiment of the button telephone device of the present invention. 1...Talkback circuit, 2...Talkback microphone, 3...Receiver speaker, 4...Status display lamp, 5, 6...Amplifier, 7...Square wave oscillator, 8...Hybrid transformer, 9... OR gate, 10...AND gate, SW ₁ , SW ₂ ...first, second switch, SW ₃ , SW ₄ ...third, fourth
switch.

Claims (1)

[Claims] 1 A changeover switch that switches and connects the connection line to the main device to the telephone network side and the talkback hybrid transformer side, respectively, and a switch that connects the connection line to the main device to the telephone network side and the talkback hybrid transformer side, and a A talkback microphone and a receiver are respectively connected to the connection line to the main device, and a switch is connected between the microphone and the hybrid transformer to arbitrarily disconnect the microphone from the hybrid transformer. , a handset call mode that uses the handset connected to the above telephone network by operating the above switch, a talkback call mode that uses both the microphone and handset, and a talkback microphone off mode that uses only the above handset. a state detecting means configured to select one of the three states, and detecting which of the three states the state is in and outputting a different signal depending on the detected state; and an output of the state detecting means. A button telephone device that is equipped with a single display, each displaying a different display.