Two-wire superposition transmission visual interphone system

Abstract

The utility model relates to the technical field of interphone communication, and particularly discloses a two-wire superposition transmission visual interphone system, which comprises a plurality of entrance machines and indoor interphones connected with the entrance machines. Each of the entrance machine and the indoor interphone comprises a main control circuit, an interface circuit, a capacitor filter circuit, a rectifying circuit, a microphone circuit, a horn circuit and an unlocking circuit, and the interface circuit, the capacitor filter circuit, the rectifying circuit, the microphone circuit, the horn circuit and the unlocking circuit are electrically connected with the main control circuit. According to the utility model, signals in a certain frequency range are removed from total signals by using the capacitor filter circuit and the rectification circuit, stored energy is released at the same time to compensate the reduction of current, and the main control circuit is combined to control the transmission of superposed video, voice and other signals, so that the function of replacing four-wire signals by two wires is realized, and not only can power be provided, but also the function of power supply is realized. And video, image, sound, control and other signals can be transmitted, and equipment can communicate with one another.

Description

Technical Field

[0001] The utility model relates to the technical field of intercom communication, in particular to a two-line superimposed transmission visual intercom system. Background Art

[0002] Traditional building intercoms all use 4-core or 8-core network cables. In order to meet the market's requirements for 2-wire transmission, the digital communication solutions currently on the market are all based on power line carriers or coaxial carrier technology used in television networks. In this way, one-to-many data communication on one line is achieved. It is a bus technology. In addition to the communication between the master device and multiple slave devices, the mutual communication between slave devices is difficult to achieve. Utility Model Content

[0003] The technical problem to be solved by the utility model is that, in view of the above-mentioned defects of the prior art, a two-wire superimposed transmission video intercom system is provided, which removes the signal within a certain frequency band from the total signal by utilizing a capacitor filtering circuit and a rectifier circuit, and releases the stored energy at the same time to compensate for the reduction of the current. The transmission of superimposed video, voice and other signals is controlled by the main control circuit, and the function of replacing four-wire signals with two wires is realized. It can provide power and transmit video, image, sound, control and other signals, and the devices can communicate with each other.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A two-wire superposition transmission video intercom system includes a plurality of door phones and indoor intercoms connected to the door phones. The door phones and indoor intercoms each include a main control circuit, an interface circuit, a capacitor filter circuit, a rectifier circuit, a microphone circuit, a speaker circuit and an unlocking circuit. The interface circuit, the capacitor filter circuit, the rectifier circuit, the microphone circuit, the speaker circuit and the unlocking circuit are all electrically connected to the main control circuit.

[0006] Preferably, the main control circuit includes a single-chip microcomputer chip U1, and the interface circuit includes an interface J1, and the interface J1 is connected to the single-chip microcomputer chip U1.

[0007] Preferably, the capacitor filter circuit includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, transistor Q1 and transistor Q2, the transistor Q1 is respectively connected to the resistor R1, resistor R2, capacitor C1, capacitor C2 and capacitor C3, the transistor Q2 is respectively connected to the resistor R5, resistor R6, capacitor C2 and capacitor C5, the resistor R4 is respectively connected to the capacitor C4 and capacitor C3, and the resistor R1 and resistor R6 are both connected to the interface J1.

[0008] Preferably, the rectifier circuit includes a diode D2, a reed switch K3, a transistor Q3, a resistor R7, a resistor R8, a resistor R9 and a capacitor C6, the transistor Q3 is respectively connected to the interface J1, the resistor R6 and the capacitor C5, and the reed switch K3 is respectively connected to the transistor Q3 and the diode D2.

[0009] Preferably, the microphone circuit includes a microphone MIC1, a transistor Q4, a transistor Q5, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R11 and a resistor R12, the transistor Q4 is respectively connected to the diode D2, the resistor R11 and the resistor R9, the transistor Q5 is respectively connected to the transistor Q4, the capacitor C8, the capacitor C9 and the resistor R12, and the microphone MIC1 is respectively connected to the capacitor C9 and the single-chip computer chip U1.

[0010] Preferably, the speaker circuit includes a speaker LS1 and a resistor R7, and the resistor R7 and the speaker LS1 are both connected to the reed switch K3; the unlocking circuit includes an alarm switch K1, an unlocking switch K2 and a diode D1, and the alarm switch K1, the unlocking switch K2 and the diode D1 are all connected to the interface J1, and the diode D1 is connected to the alarm switch K1.

[0011] By adopting the above technical scheme, the utility model provides a two-wire superimposed transmission video intercom system, which has the following beneficial effects: the door machine and the indoor intercom in the two-wire superimposed transmission video intercom system both include a main control circuit, an interface circuit, a capacitor filter circuit, a rectifier circuit, a microphone circuit, a speaker circuit and an unlocking circuit, and the interface circuit, the capacitor filter circuit, the rectifier circuit, the microphone circuit, the speaker circuit and the unlocking circuit are all electrically connected to the main control circuit, and the signal within a certain frequency band is removed from the total signal by using the capacitor filter circuit and the rectifier circuit, and the stored energy is released at the same time to compensate for the reduction of the current, and the transmission of superimposed video, voice and other signals is controlled in combination with the main control circuit, so as to realize the function of replacing four-wire signals with two wires, which can provide power and transmit video, image, sound, control and other signals, and the devices can communicate with each other, and the two wires are used as the positive and negative poles of the power line and the signal line, and on this basis, the video, voice and control signal transmission are superimposed, which reduces the wiring materials, is convenient and simple to install, and in the actual application process, the original power line or network cable and other lines can be reused, so that the old building intercom can be changed simply. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the wiring structure of the utility model;

[0013] Figure 2 It is the circuit principle diagram of the main control circuit in the utility model;

[0014] Figure 3 It is a circuit schematic diagram of the interface circuit, capacitor filter circuit, rectifier circuit, microphone circuit, speaker circuit and unlocking circuit in the utility model;

[0015] In the picture, 1 is the door phone, 2 is the indoor intercom. DETAILED DESCRIPTION

[0016] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] like Figure 1-3 As shown, the two-wire superposition transmission video intercom system includes a plurality of door phones 1 and indoor intercoms 2 connected to the door phones 1. The door phones 1 and the indoor intercoms 2 both include a main control circuit, an interface circuit, a capacitor filter circuit, a rectifier circuit, a microphone circuit, a speaker circuit and an unlocking circuit. The interface circuit, the capacitor filter circuit, the rectifier circuit, the microphone circuit, the speaker circuit and the unlocking circuit are all electrically connected to the main control circuit.

[0020] Specifically, the main control circuit includes a single-chip microcomputer chip U1, and the interface circuit includes an interface J1, which is connected to the single-chip microcomputer chip U1. It can be understood that the single-chip microcomputer chip U1 adopts an AT89C51 chip, which is used to integrate into the system circuit, superimpose and control the transmission of video, voice, and control signals, and realize the function of replacing 4-wire signals with 2-wire signals.

[0021] Specifically, the capacitor filter circuit includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, transistor Q1 and transistor Q2, the transistor Q1 is connected to the resistor R1, resistor R2, capacitor C1, capacitor C2 and capacitor C3 respectively, the transistor Q2 is connected to the resistor R5, resistor R6, capacitor C2 and capacitor C5 respectively, the resistor R4 is connected to the capacitor C4 and capacitor C3 respectively, and the resistor R1 and resistor R6 are connected to the interface J1. It can be understood that the capacitor filter circuit uses a high-power capacitor to remove the signal within a certain frequency band from the total signal, and the generated DC voltage potential will prevent the change of the current and prevent the current from decreasing, while releasing the stored energy to compensate for the current decrease.

[0022] Specifically, the rectifier circuit includes a diode D2, a reed switch K3, a transistor Q3, a resistor R7, a resistor R8, a resistor R9 and a capacitor C6, the transistor Q3 is connected to the interface J1, the resistor R6 and the capacitor C5 respectively, and the reed switch K3 is connected to the transistor Q3 and the diode D2 respectively. It can be understood that after filtering, not only the pulsation of the load current and voltage is reduced, the waveform becomes smoother, but also the conduction angle of the rectifier diode is increased.

[0023] Specifically, the microphone circuit includes a microphone MIC1, a transistor Q4, a transistor Q5, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R11 and a resistor R12, the transistor Q4 is respectively connected to the diode D2, the resistor R11 and the resistor R9, the transistor Q5 is respectively connected to the transistor Q4, the capacitor C8, the capacitor C9 and the resistor R12, and the microphone MIC1 is respectively connected to the capacitor C9 and the single-chip microcomputer chip U1. It can be understood that the microphone MIC1 is used to receive audio signals and transmit them to the main control circuit for signal processing and output.

[0024] Specifically, the speaker circuit includes a speaker LS1 and a resistor R7, and the resistor R7 and the speaker LS1 are both connected to the reed switch K3; the unlocking circuit includes an alarm switch K1, an unlocking switch K2 and a diode D1, and the alarm switch K1, the unlocking switch K2 and the diode D1 are all connected to the interface J1, and the diode D1 is connected to the alarm switch K1. It can be understood that the speaker LS1 is used to amplify the output audio signal to realize the intercom function, and the unlocking circuit can be used for unlocking, etc.

[0025] It can be understood that the utility model has a reasonable design and unique structure, and realizes opening two locks. The indoor intercom supplies power to the door machine, and the connection between the indoor intercom and the door machine is non-polar, which has the following advantages: 1. A fixed indoor machine can open two locks, namely the main door and the garage door, which is convenient to use; 2. Convenient installation and wiring, convenient threading, only 2 wires are needed; 3. Non-polarity: the wiring between the indoor intercom and the door machine does not distinguish between positive and negative, just connect; 4. System configuration: 2 door machines are matched with 3 indoor intercoms, which can meet the use of two doors and multiple floors.

[0026] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A two-line superimposed transmission video intercom system, comprising a plurality of door stations and indoor intercoms connected to the door stations, characterized in that: The door machine and the indoor intercom both include a main control circuit, an interface circuit, a capacitor filter circuit, a rectifier circuit, a microphone circuit, a speaker circuit and an unlocking circuit. The interface circuit, the capacitor filter circuit, the rectifier circuit, the microphone circuit, the speaker circuit and the unlocking circuit are all electrically connected to the main control circuit.

2. The two-line superposition transmission video intercom system according to claim 1 is characterized in that: The main control circuit includes a single-chip microcomputer chip U1, and the interface circuit includes an interface J1, and the interface J1 is connected to the single-chip microcomputer chip U1.

3. The two-line superposition transmission video intercom system according to claim 2 is characterized in that: The capacitor filter circuit includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, transistor Q1 and transistor Q2. The transistor Q1 is respectively connected to the resistor R1, resistor R2, capacitor C1, capacitor C2 and capacitor C3. The transistor Q2 is respectively connected to the resistor R5, resistor R6, capacitor C2 and capacitor C5. The resistor R4 is respectively connected to the capacitor C4 and capacitor C3. The resistor R1 and resistor R6 are both connected to the interface J1.

4. The two-line superposition transmission video intercom system according to claim 3 is characterized by: The rectifier circuit includes a diode D2, a reed switch K3, a transistor Q3, a resistor R7, a resistor R8, a resistor R9 and a capacitor C6. The transistor Q3 is connected to the interface J1, the resistor R6 and the capacitor C5 respectively, and the reed switch K3 is connected to the transistor Q3 and the diode D2 respectively.

5. The two-line superposition transmission video intercom system according to claim 4 is characterized in that: The microphone circuit includes a microphone MIC1, a transistor Q4, a transistor Q5, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R11 and a resistor R12. The transistor Q4 is respectively connected to the diode D2, the resistor R11 and the resistor R9. The transistor Q5 is respectively connected to the transistor Q4, the capacitor C8, the capacitor C9 and the resistor R12. The microphone MIC1 is respectively connected to the capacitor C9 and the microcontroller chip U1.

6. The two-line superposition transmission video intercom system according to claim 5 is characterized by: The speaker circuit includes a speaker LS1 and a resistor R7, and the resistor R7 and the speaker LS1 are both connected to the reed switch K3; the unlocking circuit includes an alarm switch K1, an unlocking switch K2 and a diode D1, and the alarm switch K1, the unlocking switch K2 and the diode D1 are all connected to the interface J1, and the diode D1 is connected to the alarm switch K1.

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