JPH0340634A - Telephone set with interphone function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a telephone with an intercom function used in ordinary homes such as single-family houses and apartment complexes, offices, and store receptions.

BACKGROUND OF THE INVENTION FIG. 2 shows the structure of a conventional telephone with an intercom function. In FIG. 2, numeral 1 is a central office line incoming call detection circuit that is connected to NTT's line 2 and detects an incoming call from the central office line, and 3 is an intercom call detecting circuit that is connected to an intercom handset 4 and detects a ringing signal from the intercom handset 4. Detection circuit, 5 is a handset, 6
is a telephone call circuit, 7 is a hook switch that is closed by picking up the handset 5 and connects the telephone line 6 to the line 2, and 8 is a relay contact that selectively connects the telephone line 6 to the line 2 and the intercom slave unit 4. Yes, usually on the break side (B),
In other words, it has been switched to the line 2 side. Reference numeral 9 indicates a call control circuit in which the detection information of the office line incoming call detection circuit 1 and the intercom call detection circuit 3 is manually inputted;
A transistor 11 is a relay that is driven when the transistor 10 is turned on and reset when the transistor 10 is turned off.

The operation of the above configuration will be described below.

When the office line incoming call detection circuit 1 detects an incoming call on the office line, it sends the information to the call control circuit 9. Based on the information, the call control circuit 9 controls the transistor 10 to be kept in the OFF state, keeps the relay 11 in the reset state, and keeps the relay contact 8 on the break side (B). here,
When the handset 5 is picked up, the hook switch 7 is closed, and the telephone communication circuit 6 can be connected to the line 2 to form a telephone communication path, thereby making it possible to make a telephone call over the central office line. On the other hand, when the door intercom call detection port #13 detects a call signal from the intercom handset 4, the information is sent to the call control circuit 9. . Based on the information, the call control circuit 9 turns on the transistor 10.
and drives relay 11. By driving this relay 11, the relay contact 8 is switched to the make side (M), that is, to the door intercom handset 4 side. Here, when the handset 5 is picked up, the hook switch 7 is closed, and a communication path can be formed between the door intercom handset 4 and the communication circuit 6, thereby making it possible to make an intercom call.

In this way, according to the above-mentioned conventional telephone with an intercom function, it is possible to prioritize and control incoming calls from the central office line and incoming calls from the intercom, and to automatically answer the calls.

Problems to be Solved by the Invention However, the above-mentioned conventional intercom 8! On equipped telephones, there is a priority order for incoming station MAR calls and doorbell calls, but
In fact, if there is an incoming call from the central office line and an incoming call from the doorbell at the same time,
Since it is an automatic response, when you pick up the handset 5,
It was inconvenient because it was not possible to clearly know which call would be made.

The present invention solves these conventional problems, and when the handset is picked up, it is possible to clearly identify whether the call is an incoming call from a central office line or an incoming call from the doorbell, which makes it easier to use. It is an object of the present invention to provide a telephone with an intercom function that can achieve the following functions.

Means for Solving the Problems In order to achieve the above object, the present invention provides a handset based on the outputs of a central office line incoming call detection circuit that detects an incoming central line call and a door intercom call detection circuit that detects a call from a door intercom handset. A display means is controlled to display a display for distinguishing between the incoming call from the office line and the incoming call from the door intercom by a call path control circuit that controls switching of the call circuit connected to the office line and the door intercom handset. It is something.

Therefore, according to the present invention, when picking up a 7\phone set, it is possible to clearly identify by the display means whether the call is an incoming call from a central office line or an intercom call.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic block diagram showing a telephone with an intercom function according to an embodiment of the present invention.

In this embodiment, the same parts as those in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted, and the different configuration will be explained. The feature of this embodiment is that, as shown in FIG.
The transistor 10 is turned OFF1 or ON by the operation of the communication control circuit 9 that controls switching to the side, and an LED (light emitting diode) 12 is provided as a display means that lights up when the transistor 10 is on and turns off when the transistor 10 is off. It is being

The operation of the above configuration will be described below.

When the office line incoming call detection circuit 1 detects an incoming call on the office line, it sends the information to the call control circuit 9. Based on the information, the call control port '#I9 controls the transistor 10 to be kept in the OFF state, the relay 11 to be kept in the reset state,
The relay contact 8 is held on the break side (B), and the LED 12 is held in the off state. When the handset 5 is picked up, the hook switch 7 is closed, and the communication circuit 6 can be connected to the line 2 to form a communication path.
Enables local line calls. On the other hand, when the door intercom call detection circuit 3 detects a call signal from the intercom handset 4, the information is sent to the call control circuit 9. Based on the information, the call control circuit 9 turns on the transistor 10 and turns on the relay 1.
By driving this relay 11, the relay contact 8 is switched to the make side (M), that is, the side of the intercom handset 4, and the LED 12 is turned on. When the handset 5 is picked up, the hook switch 7 closes.
A communication path can be formed between the door intercom handset 4 and the communication circuit 6, thereby enabling intercom communication. In this manner, when the handset 5 is picked up, the LED 12 is always turned on under conditions that could result in a door intercom call, and the user can be clearly informed whether the call will be via a central office line or a door intercom call.

Effects of the Invention As described above, according to the present invention, when picking up the handset, it is possible to clearly identify whether it is an incoming call from a central office line or an incoming call from an intercom by the display means, so the handset can be used with confidence. , it can be used more conveniently.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing a telephone with an intercom function according to an embodiment of the present invention, and FIG. 2 is a schematic block diagram showing a conventional telephone with an intercom function. DESCRIPTION OF SYMBOLS 1... Office line incoming detection circuit, 3... Door phone call detection circuit, 5... Handset, 6... Call circuit, 7.
...Hook switch, 8...Relay contact, 9...Call control circuit, 10...Diode, 11...Relay 12...LEDo

Claims (1)

[Claims] Based on the outputs of the central office line incoming call detection circuit that detects incoming calls from the central office line and the door intercom call detection circuit that detects calls from the intercom handset, the communication circuit connected to the handset is switched between the central office line and the intercom handset. A telephone with an intercom function, which includes a display means controlled by a control circuit to display a display for distinguishing between an incoming call from a central office line and an incoming call from a doorbell.