RU226124U1 - 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 line connection unit, a call switch unit, four DIP switches, a control unit, a generator, a microphone, an amplifier and an indication module. 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 (car St. 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 consists of a call switching block and four DIP switches, and the receiving block is designed as a volume control block, the line connection block is connected to the call switching block and the display module, it is also connected in parallel to the loudspeaker through the volume control block, 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 microphone inputs and amplifier, in addition, the microphone is connected to the input of the call switching unit through the 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, four DIP switches 3, a control unit 4, a generator 5, a microphone 6, an amplifier 7, an indication module 8, a volume control unit 9 and a loudspeaker 10.

The intercom device is connected to the telephone line through the line connection block 1, which is designed to protect the device from overvoltage, and to power the device, it is connected to the call switch block 2 and to the display module 8. The line connection block 1 is also connected to the volume control block 9 with loudspeaker 10. The central node of the intercom device is the control unit 4, implemented on the basis of a microcontroller, to which the call switch unit 2 is connected via DIP switches 3. Control unit 4 outputs signals to the display module 8 and amplifier 7. 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 messages. Amplifier 7 is designed to amplify audio frequency signals; it receives signals from microphone 6 and DTMF (item 11) (frequency bursts) signals from control unit 4. The signal from amplifier 7 goes to call switch block 2, and through it the connection block Line 1 signal is transmitted to the line.

The intercom device works 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 PBX sends a signal (OS) (pos. 12) to the line ready to receive the digits of the number. The voltage from the pressed button in call switch block 2 is sent 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 using tone messages (DTMF) (pos. 11). To prevent false alarms, the “station response” (OS) signal (pos. 12) 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 11) 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 13), 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 initial state.

The connection block to line 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 - switch with twelve 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 is implemented on the basis of a microcontroller and operates 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.

The control unit 9 is a matching transformer and a discrete switch for adjusting the volume.

Loudspeaker 10 - 2 W speaker.

As a result of the use of 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, without any devices or devices, to quickly program the list number of subscribers according to call buttons on the intercom device.

Claims (1)

An intercom device containing a generator, a line connection unit, a receiving unit, a microphone, an amplifier, a loudspeaker, a call switching unit and n circuits, characterized in that it additionally contains a control unit, an indication module and DIP switches, and a call switching unit and n circuits consists of a call switching block and four DIP switches, and the receiving block is designed as a volume control block, the line connection block is connected to the call switching block and the display module, it is also connected in parallel to the loudspeaker through a volume control block, the call switch block is connected one of the outputs is directly connected to the control unit, and via 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.