Building intercom system based on broadband PLC communication and control method thereof

Abstract

The invention discloses a digital building intercom system based on broadband PLC communication and a control method thereof. The digital building intercom system comprises a digital outdoor unit, a digital indoor unit and a PLC transmission module, the digital outdoor unit is arranged outside a digital building, and the PLC transmission module is used for being interconnected with the digital outdoor unit through an interface and forwarding communication data of the digital outdoor unit; the digital indoor unit is arranged in a room of a digital building, and the PLC transmission module is used for being interconnected with the digital indoor unit through an interface and forwarding communication data of the digital indoor unit. The PLC transmission module is used for transmitting data between the digital outdoor unit and the digital indoor unit; the digital outdoor unit, the digital indoor unit and the PLC transmission module are interconnected in a PLC communication mode. According to the intelligent intercommunication system, intelligent intercommunication inside and outside a building can be achieved only through the digital outdoor unit, the digital indoor unit and the PLC transmission module.

Description

Technical Field

[0001] The present invention relates to the technical field of building intercom, and in particular to a building intercom system based on PLC communication and a control method thereof. Background Art

[0002] The digital building intercom system is a building intercom system that uses digital communication technology to transmit audio, video and control instructions. Compared with the analog building intercom system, the digital building intercom system has the advantages of higher image resolution and better image quality, longer transmission distance and stronger anti-interference ability, simpler and richer expansion functions. The characteristics of audio and video communication in the digital building intercom system are single-channel one-way video and two-way voice. That is, the digital outdoor unit has a higher data transmission bandwidth and a lower receiving data bandwidth, the digital indoor unit has a lower data transmission bandwidth and a higher receiving data bandwidth, and any digital indoor unit and digital outdoor unit can send a small amount of data packets at any time. There is only one audio and video intercom communication at the same time. The digital building intercom system usually uses Ethernet communication technology to connect to the network, and the cables usually use Ethernet cables. These cables are connected to the digital indoor units of each household at one end and converged to the floor switch at the other end. The switches on each floor are then connected to the building switch. The networking cost of this method is relatively high. In some old houses, analog signal lines such as rvv and coaxial were originally installed, which cannot be replaced with Ethernet cables or traditional digital building intercom systems.

[0003] It is not difficult to see that there are still many problems in the prior art, and the existing building intercom system needs to be improved to overcome the defects of the prior art. Summary of the invention

[0004] Therefore, in order to solve the above problems in the prior art, the present invention proposes a building intercom system based on broadband PLC communication and a control method thereof.

[0005] The present invention solves the above problems by the following technical means:

[0006] A digital building intercom system based on broadband PLC communication, comprising:

[0007] Digital outdoor unit, digital indoor unit, PLC transmission module;

[0008] The digital outdoor unit is arranged outdoors of the digital building, and the PLC transmission module is used to interconnect with the digital outdoor unit through an interface and forward the communication data of the digital outdoor unit;

[0009] The digital indoor unit is arranged indoors in a digital building, and the PLC transmission module is used to interconnect with the digital indoor unit through an interface and forward communication data of the digital indoor unit.

[0010] The PLC transmission module is used to transmit data between the digital outdoor unit and the digital indoor unit;

[0011] The digital outdoor unit, the digital indoor unit and the PLC transmission module are interconnected via a PLC communication method.

[0012] Furthermore, the interface of the PLC transmission module includes:

[0013] SPI interface, SDIO interface or GPIO interface.

[0014] Furthermore, one digital outdoor unit corresponds to one PLC transmission module, and one digital indoor unit corresponds to one PLC transmission module.

[0015] Furthermore, the PLC transmission module includes:

[0016] MCU (Microcontroller Unit), used for processing the received communication data;

[0017] The carrier communication device is used to receive and transmit the communication data.

[0018] The present invention also provides a control method for a digital building intercom system based on broadband PLC communication, comprising:

[0019] Setting the PLC transmission module of the digital outdoor unit as a master module and the other PLC transmission modules as slave modules;

[0020] The PLC transmission module sends data packets according to time slices, and defines that after the master module sends four data packets, the slave module sends one data packet;

[0021] Define the main module to continuously send data packets, and when there is no communication data to be sent, send an empty data packet;

[0022] The data packet is defined to include a packet sequence number and a real-time packet identifier; the master module changes the packet sequence number after sending four data packets, and when the slave module receives the data packet, it is found that the packet sequence number has been changed, and the slave module sends the data packet in the next sending time slice;

[0023] By default, the data packets sent by the PLC transmission module when there is no call are non-real-time packets; the audio and video data packets sent by the PLC transmission module when there is a call are real-time packets.

[0024] The present invention adopts a PLC transmission module to carry the communication data transmission between the digital outdoor unit and the digital indoor unit; it avoids the Ethernet communication adopted in the existing building intercom system, where each floor needs a floor switch, each building needs a building switch, and the cable layout is complicated and involves a variety of equipment. The present invention only needs three hardwares, namely, a digital outdoor unit, a digital indoor unit, and a PLC transmission module, to realize intelligent intercom inside and outside the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural diagram of a digital building intercom system based on broadband PLC communication according to the present invention;

[0027] Figure 2 The present invention discloses a flow chart of a control method for a digital building intercom system based on broadband PLC communication. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be pointed out that the described implementation examples are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example

[0030] The present invention is described in more detail below:

[0031] like Figure 1 As shown, a digital building intercom system based on broadband PLC communication includes:

[0032] Digital outdoor unit (i.e. the outdoor unit shown in the figure), digital indoor unit (i.e. the indoor unit shown in the figure), PLC transmission module;

[0033] The digital outdoor unit is arranged outdoors of the digital building, and the PLC transmission module is used to interconnect with the digital outdoor unit through an interface and forward the communication data of the digital outdoor unit;

[0034] The digital indoor unit is arranged indoors in a digital building, and the PLC transmission module is used to interconnect with the digital indoor unit through an interface and forward communication data of the digital indoor unit.

[0035] The PLC transmission module is used to transmit data between the digital outdoor unit and the digital indoor unit;

[0036] The digital outdoor unit, the digital indoor unit and the PLC transmission module are interconnected via a PLC communication method.

[0037] Preferably, one digital outdoor unit corresponds to one PLC transmission module, and one digital indoor unit corresponds to one PLC transmission module. Preferably, one building generally corresponds to one digital outdoor unit and multiple digital indoor units. The PLC transmission module corresponding to the digital outdoor unit is defined as the master module, and the multiple PLC transmission modules corresponding to the multiple digital indoor units are defined as slave modules.

[0038] It should be noted that the digital outdoor unit generally refers to a device installed at the door of a building unit, and the digital indoor unit generally refers to a device installed in the user's home. The digital outdoor unit collects receipts and transmits the collected data to the PLC transmission module. The PLC transmission module encodes the collected data and transmits the encoded data to the digital indoor unit. Because each digital outdoor unit and digital indoor unit corresponds to a PLC transmission module, when the PLC transmission module corresponding to the digital outdoor unit transmits the encoded data to the PLC transmission module corresponding to the digital indoor unit, the PLC transmission module corresponding to the digital indoor unit decodes the received data and transmits the decoded data to the digital indoor unit for display.

[0039] It should be noted that the digital outdoor unit collects data in ways including but not limited to: using a camera to obtain image data, using a sound receiving device to obtain voice data, etc. The digital indoor unit displays data in ways including but not limited to: display screen displays image data, speakers play voice data, etc.

[0040] Preferably, the PLC transmission module comprises:

[0041] The carrier communication device is used to receive and transmit the communication data; that is, the carrier communication device is used to receive and transmit the communication data sent by the digital outdoor unit and the digital indoor unit.

[0042] MCU is used to process the received communication data; that is, the MCU is used to encode or decode the communication data received by the carrier communication device to obtain a processing result, and then return the processing result to the carrier communication device, and then transmit the processing result to the corresponding digital outdoor unit or the digital indoor unit via the carrier communication device.

[0043] In order to make the PLC transmission module easier to understand, a simple example is given here to illustrate:

[0044] When a visitor comes to the door of a unit and wants to go to a certain resident's home, the resident needs to help him open the door. At this time, the visitor can press a button on the digital outdoor unit to trigger the digital outdoor unit to record and record audio. The data recorded and recorded by the digital outdoor unit is received by the carrier communication device in the PLC transmission module matched with the digital outdoor unit. Then the carrier communication device transmits this data to the MCU. The MCU processes and analyzes this data, that is, encodes this data and returns it to the carrier communication device after encoding. Then the carrier communication device transmits this encoded data to the resident's home. The resident's home has the digital indoor unit and the PLC transmission module corresponding to the digital indoor unit. The carrier communication device in the PLC transmission module corresponding to the digital outdoor unit The communication device transmits the encoded data to the carrier communication device in the PLC transmission module corresponding to the digital indoor unit. The carrier communication device in the PLC transmission module corresponding to the digital indoor unit receives the encoded data and sends it to the MCU in the PLC transmission module corresponding to the digital indoor unit. The MCU in the PLC transmission module corresponding to the digital indoor unit decodes the received encoded data. After decoding, the decoded data is returned to the carrier communication device in the PLC transmission module corresponding to the digital indoor unit. The carrier communication device in the PLC transmission module corresponding to the digital indoor unit then transmits the decoded data to the digital indoor unit, and the digital indoor unit displays the decoded data.

[0045] So far, a complete data transmission process is completed, and visitors and residents can communicate.

[0046] Preferably, the interface of the PLC transmission module includes:

[0047] SPI interface, SD IO interface or GPIO interface.

[0048] It should be noted that the SPI interface is a full-duplex, high-speed, synchronous serial communication bus that uses a separate data line and a separate clock signal to ensure perfect synchronization between the transmitter and the receiver. It can be used for short-distance high-speed communication with a data rate of up to 50Mbps.

[0049] The SD IO interface is an interface developed on the basis of the SD memory card interface. The SD IO interface is compatible with previous SD memory cards and can be connected to devices containing the SD IO interface. The transmission rate of the SD IO interface can exceed 100 Mbps.

[0050] The GPIO interface is used for notification between the main chip and the PLC chip, that is, when the main chip has data to send, after the corresponding pin is pulled low, the corresponding pin of the PLC changes, so it can be known that the main chip has data to send, and vice versa.

[0051] like Figure 2 As shown, the present invention also provides a control method for a digital building intercom system based on broadband PLC communication, comprising:

[0052] The PLC transmission module of the digital outdoor unit is set as the main module, and the other PLC transmission modules are slave modules; it should be noted that, based on the characteristics of PLC communication, only one PLC transmission module needs to be set as the main module, and the other PLC transmission modules are slave modules, and the interface used by the PLC transmission module is an SPI interface, an SD IO interface, or a GPIO interface; that is, only one switchboard is needed, and the others are extensions, which avoids the setting of various floor switches and building switches in the existing building intercom, and does not require the arrangement of a large number of cables and equipment, saving resources and improving communication efficiency. At the same time, it also solves the problem that some old houses were originally installed with analog signal lines such as RVV and coaxial lines, which cannot be replaced with Ethernet lines or traditional digital building intercom systems.

[0053] The PLC transmission module sends data packets according to time slices, and defines that the slave module sends a data packet once after the master module sends four data packets. It should be noted that the slave module sends a data packet once after the master module sends four data packets. The main purpose of this is to avoid the problem of communication congestion caused by multiple slave modules sending data packets at the same time.

[0054] Define the main module to continuously send data packets, and when there is no communication data to be sent, send an empty data packet;

[0055] The data packet is defined to include a packet sequence number and a real-time packet identifier; the master module changes the packet sequence number after sending four packets, and the slave module finds that the packet sequence number has been changed when receiving the packet, and sends the packet in the next sending time slice; it should be noted that the packet sequence number and real-time packet identifier are set here, and the main purpose is that the slave module can judge whether the local machine (i.e., the corresponding slave module) can send data in the current time slot according to the information in the received master module packet. The corresponding slave module in the call state sends data when it finds the real-time packet identifier in the master module packet; the slave module in the non-call state will not send data, so as to ensure that the real-time packet will not conflict with other packets.

[0056] By default, the data packets sent by the PLC transmission module when not in call are non-real-time packets; the audio and video data packets sent by the PLC transmission module during call are real-time packets. It should be noted that the audio and video data packets have high requirements for integrity and real-time performance. If the audio and video data packets are lost or delayed, the displayed video and the played sound will appear distorted or stuck. Non-audio and video data packets do not have such high requirements, and data packets are allowed to be delayed or lost (the application has a retransmission mechanism after loss).

[0057] In the idle state, all digital indoor units work in non-real-time mode. When a visitor calls a digital indoor unit at the outdoor unit (i.e., the digital outdoor unit), the outdoor unit sends a call signaling, and after receiving it, the digital indoor unit replies with a confirmation signaling. After the homeowner answers the call, it sends a receiving signaling and enters the call mode. After receiving it, the outdoor unit replies with a confirmation signaling and enters the call mode. In the idle state, the data packets sent by the digital indoor unit are all in non-real-time mode, that is, they may be lost. When loss occurs, there is a retransmission mechanism to ensure that the data packets arrive. After answering, the corresponding digital indoor unit enters the real-time mode to ensure the real-time and reliability of the voice data. After the call is completed, the digital indoor unit exits the real-time mode and returns to the idle state.

[0058] To make the present invention easier to understand, the communication process between indoor and outdoor is described below with a specific example:

[0059] The visitor presses the call button on the digital outdoor unit, and the digital outdoor unit sends a call command to the digital indoor unit. The digital indoor unit starts to ring after receiving the call command, replies with a ringing command to the digital outdoor unit, and sets the PLC transmission module corresponding to the digital indoor unit to enter a call state. In this state, the data packets sent by the application layer will be sent out as quickly as possible by the corresponding PLC transmission module of the digital indoor unit; the digital outdoor unit starts to ring after receiving the ringing command, and sets the PLC transmission module corresponding to the digital outdoor unit to enter a call state. The digital outdoor unit divides the audio and video data obtained by the microphone and camera into 1950-byte segments, each of which contains segment sequence number, media type, media timestamp and other information; the digital outdoor unit sends the segments to the digital indoor unit through its corresponding PLC transmission module and caches them locally; after receiving the segments, the digital indoor unit determines whether there is packet loss based on the segment sequence number; if packet loss is found, the digital indoor unit The digital indoor unit requests the digital outdoor unit to retransmit the lost packet; the digital indoor unit checks whether the received fragments can be spliced ​​into a complete audio and video frame; if the complete audio and video frame has been received, the fragments are deleted from the receiving queue, and the audio and video frame is played or displayed; the resident presses the answer button on the digital indoor unit, the digital indoor unit stops ringing, sends the answer command to the digital outdoor unit, and starts recording from the microphone and sending it to the digital outdoor unit; after receiving the answer command, the digital outdoor unit stops ringing and starts receiving the audio data playback from the digital indoor unit, and a two-way voice and one-way video call is made between the digital indoor unit and the digital outdoor unit; if either party presses the hang-up button, the local stops sending and receiving audio and video data, the corresponding PLC transmission module sends a hang-up command to the other party, and sets the local PLC transmission module to a non-call state. After receiving the hang-up command, the corresponding PLC transmission module of the other party also stops sending and receiving audio and video data, and sets the local PLC transmission module to a non-call state. At this point, all communications between indoor and outdoor are completed.

[0060] The present invention adopts a PLC transmission module to carry the communication data transmission between the digital outdoor unit and the digital indoor unit; it avoids the Ethernet communication adopted in the existing building intercom system, where each floor requires a floor switch, each building requires a building switch, and the cable layout is complicated and involves a large number of devices. The present invention only requires three hardwares, namely, a digital outdoor unit, a digital indoor unit, and a PLC transmission module, to realize intelligent intercom inside and outside the building. For the renovation of old communities, digital renovation can be directly realized based on the original analog lines, reducing the renovation cost and renovation time.

[0061] References to "one embodiment", "another embodiment", "embodiment", "preferred embodiment", etc. in this specification refer to specific features, structures or characteristics described in conjunction with the example included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the present invention. Although the present invention is described herein with reference to a number of illustrative examples of the present invention, it should be understood that those skilled in the art can design many other modifications and implementations that fall within the scope and spirit of the principles disclosed in this application. More specifically, within the scope of the present application disclosure, drawings and claims, in addition to the deformation and improvement that can be made to the components and / or layout of the subject combination layout, other uses will also be obvious to those skilled in the art.

Claims

1. A digital building intercom system based on broadband PLC communication, characterized in that: include: Digital outdoor unit, digital indoor unit, PLC transmission module; The digital outdoor unit is arranged outdoors of the digital building, and the PLC transmission module is used to interconnect with the digital outdoor unit through an interface and forward the communication data of the digital outdoor unit; The digital indoor unit is arranged indoors in a digital building, and the PLC transmission module is used to interconnect with the digital indoor unit through an interface and forward communication data of the digital indoor unit. The PLC transmission module is used to transmit data between the digital outdoor unit and the digital indoor unit; The digital outdoor unit, the digital indoor unit and the PLC transmission module are interconnected via a PLC communication method.

2. According to claim 1, the digital building intercom system based on broadband PLC communication is characterized in that: The interface of the PLC transmission module includes: SPI interface, SDIO interface or GPIO interface.

3. The digital building intercom system based on broadband PLC communication according to claim 1 is characterized in that: One digital outdoor unit corresponds to one PLC transmission module, and one digital indoor unit corresponds to one PLC transmission module.

4. The digital building intercom system based on broadband PLC communication according to claim 1 is characterized in that: The PLC transmission module comprises: A carrier communication device for receiving and transmitting the communication data; The MCU is used to process the received communication data.

5. A control method for a digital building intercom system based on broadband PLC communication according to any one of claims 1 to 4, characterized in that: include: Setting the PLC transmission module of the digital outdoor unit as a master module and the other PLC transmission modules as slave modules; The PLC transmission module sends data packets according to time slices, and defines that after the master module sends four data packets, the slave module sends one data packet; Define the main module to continuously send data packets, and when there is no communication data to be sent, send an empty data packet; The data packet is defined to include a packet sequence number and a real-time packet identifier; the master module changes the packet sequence number after sending four data packets, and when the slave module receives the data packet, it is found that the packet sequence number has been changed, and the slave module sends the data packet in the next sending time slice; By default, the data packets sent by the PLC transmission module when there is no call are non-real-time packets; the audio and video data packets sent by the PLC transmission module when there is a call are real-time packets.

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