RU226289U1 - Intercom device - Google Patents

Abstract

The utility model relates to telecommunications and can be used to organize official communications and alert enterprises and institutions via telephone lines. The technical result of the utility model is to provide a call to any programmed subscriber directly from the intercom over a telephone line, without the use of additional devices. The technical result is achieved by the fact that the proposed intercom device contains a generator, a line connection unit, a call switching unit, a microphone, an amplifier, a loudspeaker, a control unit, an indication module and three DIP switches. 1 ill.

Description

The utility model relates to telecommunications and can be used to organize official communications and alert enterprises and institutions via telephone lines.

A subscriber intercom is known (A.S. No. 725264, MPK N04M 3/48, priority 07/06/1977), which contains a tone generator, a line connection unit, a receiving unit, a microphone, an amplifier, a loudspeaker, a call switching unit and n circuits consisting of single pulse generators, a trigger, a differential circuit and an electronic key.

The disadvantage of the above technical solution is that the operation of this intercom requires a second device (for example, a remote control), which leads to complexity and inconvenience of use, a possible decrease in the quality of communication, and generally leads to restrictions on the use of the intercom.

The objective of the utility model is to overcome the above drawback, namely, to expand the arsenal of technical means by improving the design, which makes it possible to call any programmed subscriber directly from the intercom via a telephone line, without the use of additional devices. In this case, the intercom device is connected via a subscriber line to the PBX.

The task is achieved by the fact that the intercom device contains a generator, a line connection unit, a receiving unit, a microphone, an amplifier, a loudspeaker, a call switching unit and n circuits; in addition, it additionally contains a control unit, an indication module and DIP switches, and the unit call switching and n circuits are a call switching block and three DIP switches, a line connection block is connected to a call switching block, an indication module, the call switching block is connected by one of the outputs to the control unit directly, and through DIP switches is connected to n - inputs of the control unit, a generator is connected to the input of the latter, one of the outputs of the control unit is connected to the display module, other outputs of the control unit are connected to the inputs of the microphone and amplifier, in addition, the microphone is connected to the input of the call switching unit through an amplifier.

In fig. Figure 1 shows a diagram of the intercom device.

The intercom device consists of a line connection unit 1, a call switch unit 2, three DIP switches 3, a control unit 4, a generator 5, a microphone 6, an amplifier 7, and an indication module 8.

The intercom device is connected to the telephone line through a connection unit to line 1, which is designed to protect the device from overvoltage, as well as to power the device; it is connected to the call switch block 2 and to the display module 8. The central node of the intercom device is the control unit 4, implemented based on a microcontroller to which the call switch block 2 is connected via DIP switches 3. The control unit 4 outputs signals to the display module 8 and the amplifier 7. The generator 5 is implemented on the basis of a quartz resonator and sets the correct operation of the control unit 4, as well as the correct formation of the latter frequency parcels. Amplifier 7 is designed to amplify audio frequency signals; it receives signals from microphone 6 and DTMF (item 9) (frequency bursts) signals from control unit 4. The signal from amplifier 7 goes to call switch block 2 and through it and the line connection block 1 signal is transmitted to the line.

The intercom device operates as follows: in the initial state, the supply voltage from the line through the line connection block 1 is supplied to the display module 8, which, with a certain light indication, signals that the intercom device is connected to the line and is ready for operation. When one of the buttons in the call switch block 2 is pressed, the subscriber loop is closed, and the telephone exchange issues a signal (OS) (position 10) to the line that is ready to receive the digits of the number. The voltage from the pressed button in the call switch block 2 is supplied to DIP switch 3, and from it, depending on the position of the keys, a 12-bit signal is sent to control unit 4. This signal determines the number for dialing into the line by tone bursts (DTMF) (pos. . 9). To prevent false alarms, the “station response” (OS) signal (item 10) with a frequency of 425 Hz is detected at the input of control unit 4, after which a tone signal with the number of the called subscriber is generated into the line. The DTMF signal (item 9) is transmitted to the line through amplifier 7, call switch block 2 and line connection block 1, the PBX recognizes the number and switches with the called subscriber. After the connection is established, the control unit 4 removes the blocking signal from the microphone 6 (item 11), this is done to prevent interference from the microphone during the transmission of tone signals. After releasing the button in call switch block 2, the intercom device returns to its original state.

Line connection block 1 consists of a connector for connecting lines, a diode bridge and safety elements,

Call switch block 2 consists of call buttons, rectifier elements, and keys;

DIP switch 3 - a switch with 12 ON/OFF type switches, one input and twelve outputs, four switches per digit, thus making it possible to program a three-digit directory number;

Control unit 4 - implemented on the basis of a microcontroller, works according to a given program;

Generator 5 is implemented on the basis of a quartz resonator and capacitors;

Microphone 6 consists of an electret microphone and a microphone amplifier, the microphone amplifier is designed to amplify the signal, as well as block the microphone circuits upon command from the control unit;

Amplifier 7 is an audio frequency amplifier,

The display module 8 consists of a two-color LED and elements that set the correct glow, depending on the operating mode of the product;

As a result of using an intercom device, the arsenal of technical means is expanded, namely, the creation of a device, when used, it becomes possible to call any programmed subscriber directly from the intercom device via a telephone line, regardless of the type of use of the PBX; no additional devices are required. In addition, ease of use appears due to the use of an indication module, which displays the current state of the intercom device in all its operating modes, and also due to the presence of DIP switches, it becomes possible for service personnel to quickly program the list number of subscribers under the buttons without any equipment or devices call on the intercom device.

Claims (1)

An intercom device containing a generator, a line connection unit, a microphone, an amplifier, a call switching unit and n circuits, characterized in that it additionally contains a control unit, an indication module and DIP switches, wherein the call switching unit and n circuits is a switching unit calls and three DIP switches, the line connection block is connected to the call switching block, an indication module, the call switch block is connected by one of the outputs to the control unit directly, and through DIP switches it is connected to the n-inputs of the control unit, a generator is connected to the input of the latter , one of the outputs of the control unit is connected to the display module, other outputs of the control unit are connected to the inputs of the microphone and amplifier, in addition, the microphone is connected to the input of the call switching unit through an amplifier.