RU21489U1 - SUBSCRIBER DEVICE OF DIGITAL ADDRESSED DOORPHONE - Google Patents

Abstract

1. A subscriber device for a digital address intercom, containing an address decoder, an electronic key and a microphone amplifier, characterized in that the address decoder is made in the form of series-connected counting pulse and reset pulses, a counter and a trigger, the output of which is connected to the control input of the electronic key. 2. The subscriber device according to claim 1, characterized in that the counter has a conversion factor for the subscriber number that is installed in the binary counting system using jumpers on the device circuit board. The subscriber device according to claim 1 or 2, characterized in that the connection of all subscriber devices with the call block is carried out using one two-wire communication line.

Description

Subscriber device of a digital address intercom.

The utility model relates to engineering. the equipment of residential buildings, namely, to combined installations for calling, negotiating and unlocking the entrance door of the entrance (intercom) and relates to the subscriber unit of the digital address intercom.

The closest technical solution to the proposed device is a subscriber device of a digital address intercom, containing an address decoder, an electronic key and a microphone amplifier (A. A. Vikhirev “Intercoms, Moscow, 1998, p. 36)

The disadvantage of this device is that the switching lines of this intercom have a significant length, a large number of communication wires and high ohmic resistance to the switching signals and the audio channel, which can lead to additional malfunctions in the system.

The technical task of the utility model is to increase the ease of installation, operation and expansion of functionality.

The problem is solved due to the fact that the subscriber device of the digital address intercom, which contains the address decoder, electronic key and microphone amplifier, is characterized in that the address decoder is made in the form of sequentially connected calculator and reset pulse generator, counter and trigger, the output of which is connected to the control input electronic key. The meter has a conversion factor equal to the number of the subscriber, which is installed in the binary counting system using jumpers on the device’s printed circuit board, and all subscriber devices are connected to the call block using one two-wire communication line.

In the drawing, in FIG. 1 shows a block diagram of a device.

The device contains: shaper of counting pulses and reset, counter 2, trigger 3, electronic key 4 and microphone amplifier 5.

The counter has a conversion factor equal to the number of the apartment (subscriber), which is set in the binary counting system using jumpers on the printed circuit board of the subscriber unit.

Н02М 11/02 Е 05 В 47/00

The electronic key is closed, the microphone amplifier is disconnected.

When a call signal arrives at a subscriber unit, a low-level reset pulse first appears in the communication line of the intercom. Shaper 1 determines its presence, resets counter 2 and loads a predetermined conversion factor into it.

Further, low-level counting pulses appear in the communication line, which differ from the reset ones in duration. The number of pulses is equal to the number of the called subscriber (apartment).

If the number of counting pulses coincided with the conversion factor, an equal signal appears on the output of counter 2, which switches the static trigger 3. The trigger, in turn, opens the electronic key 4, which connects the microphone amplifier 5 to the communication line.

Then, a ringing signal of an audio frequency appears in the communication line, which is fed through an open electronic key to a loudspeaker or electromagnetic capsule of a subscriber unit.

When the intercom handset is removed, the current in the communication line increases, the call signal stops, and the communication mode between the subscriber and the call unit of the intercom is established.

The subscriber unit has a button with which you can remotely open the doorphone's electric lock. If you press the button during communication mode, the electronic key will open for a strictly defined time by disconnecting the microphone amplifier from the communication line. Automation intercom will respond to this change in current in the line and open the electric lock.

At the end of the conversation, when lowering the speakerphone to the stand, the current in the line decreases, the communication mode is turned off and the intercom switches to static mode. The trigger and counter are reset.

The main difference between the proposed device from existing ones (coordinate type) is the use of a two-wire communication line between the intercom and subscribers. In this regard, the installation of the intercom system and the connection of subscriber devices is greatly simplified. The use of a two-wire communication line also reduces the cost of cable products used during installation.

The use of low-power technology CMOS digital integrated circuits allows connecting a large number (up to 250) of subscribers to the intercom, as well as simplifying the circuit diagram of the device and making it technologically advanced for mass production.

Claims (3)

1. A subscriber device of a digital address intercom, containing an address decoder, an electronic key and a microphone amplifier, characterized in that the address decoder is made in the form of series-connected counting pulse and reset pulses, a counter and a trigger, the output of which is connected to the control input of the electronic key.  2. The subscriber device according to claim 1, characterized in that the counter has a conversion factor for the subscriber number that is installed in the binary counting system using jumpers on the device circuit board. 3. The subscriber device according to claim 1 or 2, characterized in that the connection of all subscriber devices with the call block is carried out using one two-wire communication line.