CN115240369A - Internet of things loudspeaker voice broadcasting system based on earthquake early warning - Google Patents

Internet of things loudspeaker voice broadcasting system based on earthquake early warning Download PDF

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CN115240369A
CN115240369A CN202210865305.3A CN202210865305A CN115240369A CN 115240369 A CN115240369 A CN 115240369A CN 202210865305 A CN202210865305 A CN 202210865305A CN 115240369 A CN115240369 A CN 115240369A
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audio
data
type
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early warning
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李超
周鸿鹏
温津杰
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Tianjin Junsuan Disaster Reduction Technology Co ltd
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Tianjin Junsuan Disaster Reduction Technology Co ltd
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/10—Alarms for ensuring the safety of persons responsive to calamitous events, e.g. tornados or earthquakes
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/002—Generating a prealarm to the central station
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y40/00—IoT characterised by the purpose of the information processing
    • G16Y40/50—Safety; Security of things, users, data or systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/104—Peer-to-peer [P2P] networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • H04R27/04—Electric megaphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H04W12/033—Protecting confidentiality, e.g. by encryption of the user plane, e.g. user's traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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Abstract

The invention provides an Internet of things loudspeaker voice broadcasting system based on earthquake early warning. A terminal service platform: the wireless public address equipment state query mechanism is used for configuring an equipment state query mechanism and sending equipment state information to the user terminal and the wireless public address equipment; a user terminal module: the device is used for collecting MIC sound of the equipment when the state of the wireless public address equipment is normal, and encrypting and packaging the MIC sound into an audio digital packet; the wireless public address equipment: and the audio digital packet is used for receiving the audio digital packet when the state of the user terminal is normal, and carrying out early warning broadcasting after decryption.

Description

Internet of things loudspeaker voice broadcasting system based on earthquake early warning
Technical Field
The invention relates to the technical field of earthquake early warning, in particular to an Internet of things loudspeaker voice broadcasting system based on earthquake early warning.
Background
In recent years, with the development of science and technology, the earthquake early warning technology is widely applied, and the earthquake early warning system is arranged in a television, so that the earthquake early warning can be displayed on the television within dozens of seconds or several minutes before earthquake, and people watching television on the spot can be reminded of rapidly withdrawing from the spot or being protected.
However, most of people watching television at present are old people and children, and when earthquake early warning happens suddenly, children and parents working outside cannot know the earthquake condition at home, and cannot provide accurate information at home for a rescue group when an accident happens, so that accurate rescue is realized. A voice broadcasting technology is provided in the prior art, but the existing voice broadcasting technology cannot realize that transmission channels are mutually established among multiple platforms, and cannot guarantee the safety of early warning data.
Disclosure of Invention
The invention provides an Internet of things loudspeaker voice broadcasting system based on earthquake early warning, which is used for solving the problem that the existing voice broadcasting technology cannot realize the mutual establishment of transmission channels among multiple platforms and cannot guarantee the safety of early warning data.
The utility model provides an thing networking loudspeaker voice broadcasting system based on earthquake early warning, includes:
a terminal service platform: the wireless public address equipment state query mechanism is used for configuring an equipment state query mechanism and sending equipment state information to the user terminal and the wireless public address equipment;
a user terminal module: the device is used for collecting MIC sound of the equipment when the state of the wireless public address equipment is normal, and encrypting and packaging the MIC sound into an audio digital packet;
the wireless public address equipment: and the audio digital packet is used for receiving the audio digital packet when the state of the user terminal is normal, and carrying out early warning broadcasting after decryption.
And further: the terminal service platform comprises:
an instruction receiving unit: acquiring a state parameter query instruction for target intelligent equipment; wherein, the first and the second end of the pipe are connected with each other,
the target smart device includes: a user terminal or a wireless public address device;
the state parameter inquiry instruction is sent out by the user terminal or the wireless public address equipment;
a configuration file acquisition unit: determining a target configuration file corresponding to the target intelligent equipment based on the state parameter query instruction; wherein, the first and the second end of the pipe are connected with each other,
each intelligent device is pre-configured with a corresponding configuration file;
a state parameter acquisition unit: polling the target intelligent device based on the target configuration file to obtain the current state parameters of the target intelligent device;
a state parameter transmitting unit: and when the state of the target intelligent equipment is determined to be changed according to the current state parameters, sending the current state parameters to a user terminal or wireless public address equipment.
Further: the user terminal module includes:
the audio acquisition unit: the system comprises a digital-to-analog converter, a digital-to-analog converter and a digital-to-analog converter, wherein the digital-to-analog converter is used for acquiring MIC sound of earthquake early warning and performing analog-to-digital conversion to a binary sequence;
an audio packaging unit: the audio head information is added at the beginning of the binary sequence for audio encapsulation; wherein, the first and the second end of the pipe are connected with each other,
the audio header information includes: the number of channels, sampling frequency and sampling number of bits;
a communication transmission unit: the method comprises the steps of constructing a P2P network constructed by WebSocket, and constructing an asynchronous communication channel for data transmission;
a security authentication unit: the identity authentication is carried out when the broadcast initiator exists in the user terminal;
a safety connection unit: for setting up a transport layer security protocol at the asynchronous communication channel; wherein the content of the first and second substances,
the transport layer security protocol is used for recording the packaging format of the data and carrying out data integrity check;
a data encryption unit: the audio data after the audio package is encrypted by an AES algorithm.
And further: the audio acquisition unit comprises the following analog-to-digital conversion steps:
presetting an analog-digital converter; wherein, the first and the second end of the pipe are connected with each other,
the analog-to-digital converter comprises an analog-to-digital conversion process of potentially optimized audio data;
when audio data exist, code pages associated with analog-to-digital conversion are distributed in the analog-to-digital converter according to the analog-to-digital conversion flow; wherein the content of the first and second substances,
the code page contains a set of checkers, and each of the checkers corresponds to one of the instructions in the code page;
detecting a functional instruction having an instruction target within the code page;
incrementing one of the checkers in the code page having the same location as the instruction target in the code page;
repeating execution of the code page and incrementing the checker when an instruction target falls within the code page; and
and binary converting the value of the checker in the code page to the audio data.
Further: the audio packaging unit adding audio header information further comprises:
an identifier, DATA size, format type, fmt, sizeof, PCMWAVEFORMAT, DATA, sound DATA size, and sound DATA are added before the binary sequence.
Further: the P2P network constructed by the WebSocket built by the communication transmission unit comprises the following steps:
newly building a control module, wherein the control module comprises a participation strategy module which is used for setting a WebSocket protocol;
the participation strategy module deduces and verifies the types of all the participation nodes according to the set node participation rule;
when the type of the participating node is A type, establishing P2P connection among all the participating nodes with the type of A type within set time to form a fully-connected P2P network with the type of A, and marking completion in the control module;
when the type of the participating node is B type, after the P2P network with the type of A is successfully constructed, P2P connection is established with part of the A type or B type participating nodes within set time to form the P2P network with the type of B, and the marking is finished in the control module;
when the type of the participating node is C type, after the P2P network with the type of B is successfully constructed, P2P connection is established with a certain B type participating node within set time to form a P2P network with the type of C;
the P2P network with the type A, the P2P network with the type B and the P2P network with the type C form a complete dynamic heterogeneous P2P network.
Further: the data encryption unit for encrypting data comprises the following steps:
acquiring the audio data after audio packaging, and taking the audio data as plaintext data;
encrypting the plaintext data through an AES encryption function, wherein the AES encryption function comprises a secret key K;
and obtaining the encrypted ciphertext C.
Further: the wireless public address device includes:
a device communication module: the asynchronous communication channel establishing module is used for connecting with the user terminal module, receiving an establishing request of an asynchronous communication channel and establishing the asynchronous communication channel;
a data decryption unit: the audio decryption module is used for decrypting the ciphertext C to generate audio decryption data;
an audio playing unit: for playing the audio decryption data.
And further: the data decryption unit includes the decryption steps of:
receiving the ciphertext C;
decrypting the ciphertext C through an AES decryption function; wherein the content of the first and second substances,
the AES decryption function comprises a key K;
and acquiring the decrypted audio data.
Further: the audio playing unit includes:
loading a mode unit: the method is used for presetting a MODE _ STREAM loading MODE and a MODE _ STATIC loading MODE; wherein the content of the first and second substances,
the MODE _ STREAM loading MODE is used for loading audio data into the AudioTrack;
the MODE _ STATIC loading MODE is used for loading audio data into an internal buffer area of the AudioTrack;
an analysis unit: the system comprises an AudioTrack, a data acquisition module, a data processing module and a data processing module, wherein the audio data acquisition module is used for acquiring audio data;
a broadcasting unit: for setting the MediaPlayer playback mode and the AudioTrack playback mode.
The invention has the beneficial effects that:
(1) The cost is low:
the function is an extended function of the whole earthquake early warning scheme, and the construction and operation cost of the system cannot be increased.
(2) Multi-platform intercommunication:
the terminal used by the user can be a control console of a Windows system or an interrupt-only device of an Android system, and a voice transmission channel can be established between the terminal and the wireless loudspeaker device no matter what interrupt device is adopted by the user, so that the real-time audio data packet can be received and can be normally played. Therefore, it is necessary to adopt a general communication technology means, a standardized audio format, and a standard data encryption means to ensure that the wireless public address device can acquire voice data from any terminal device and perform decryption and playing.
(3) Low latency, high concurrency:
the time delay of real-time voice transmission is less than 1 second, and the concurrent broadcasting of a plurality of wireless public address devices can be realized.
(4) And (3) data security:
because the wireless public address equipment operates in the public non-safety network environment, the data stream is required to be prevented from being stolen and tampered in the transmission process of the digital audio stream.
(5) The reconnection mechanism comprises:
the wireless network data transmission process may face the risk of the communication terminal at any time, and the voice transmission is long, if necessary measures are not taken, once the communication is interrupted and reconnected, the subsequent audio data cannot be decoded and listened normally due to the loss of audio header information, so a certain redundancy mechanism needs to be adopted on the premise of ensuring efficient transmission.
(6) Priority control:
the most important work of the wireless public address equipment is to receive earthquake early warning information in time and broadcast the early warning information, and the task is the highest priority task, namely: once the wireless public address equipment receives the earthquake early warning information, the terminal works currently to finish information settlement and broadcasting work.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a system composition diagram of an internet-of-things loudspeaker voice broadcasting system based on earthquake early warning in the embodiment of the invention;
fig. 2 is a system work flow chart of an internet of things loudspeaker voice broadcasting system based on earthquake early warning in the embodiment of the invention;
FIG. 3 is a functional diagram of voice broadcasting according to an embodiment of the present invention;
FIG. 4 is a binary transition diagram of audio acquisition according to an embodiment of the present invention;
fig. 5 is an audio header of an audio package according to an embodiment of the invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are presented herein only to illustrate and explain the present invention and not to limit the present invention.
Firstly, the application is a broadcasting system for solving the problem of remote transmission of early warning information in the overall scheme of earthquake early warning. Because the wireless public address equipment of the internet of things is equipped for the user in the early warning equipment, the equipment has a high-power public address function, is in wireless connection with the early warning host, does not receive the limitation of installation terrain, and can provide a high-power voice early warning broadcasting function. In order to utilize the equipment more efficiently, the platform provides a wireless sound amplification function for a user, so that the platform can play a greater role in the work of earthquake exercise command and scheduling, daily notification and broadcasting and the like.
The utility model provides an thing networking loudspeaker voice broadcasting system based on earthquake early warning, includes:
a terminal service platform: the wireless public address equipment is used for configuring an equipment state query mechanism and sending equipment state information to the user terminal and the wireless public address equipment;
a user terminal module: the device is used for collecting MIC sound of the equipment when the state of the wireless public address equipment is normal, and encrypting and packaging the MIC sound into an audio digital packet;
the wireless public address equipment: and the audio digital packet is used for receiving the audio digital packet when the state of the user terminal is normal, and carrying out early warning broadcasting after decryption.
The principle of the technical scheme is as follows: as shown in fig. 1, the present invention includes three parts, namely a user terminal, a service platform and a wireless public address device. The user terminal can run on different systems such as Android or Window, and the like, and queries the manageable wireless sound amplifying equipment of the user through a terminal service platform to obtain the state of the manageable wireless sound amplifying equipment; the wireless public address equipment and the terminal establish network connection, transmit audio signal to the wireless public address equipment through the network on, wireless public address equipment make full use of current software and hardware platform realizes the real-time broadcast of pronunciation through the power amplifier. As shown in fig. 2, the wireless public address equipment adopts a 4G module for communication, so that the user terminal cannot directly initiate network connection to the wireless public address equipment, the user terminal can only acquire the state of the wireless public address equipment by using a LoRa communication mechanism of the system or an earthquake early warning service platform, and after acquiring the state information of the wireless public address equipment, the user terminal initiates a real-time voice sending request to the wireless public address equipment; the wireless public address equipment receives the request and then initiates a voice transmission connection request so as to establish a real-time digital audio data packet transmission channel, and after the user terminal collects the Mic sound, the data is packaged into a digital audio data packet which is sent to the wireless public address equipment; and the wireless public address equipment completes audio decoding and playing work according to the setting of the audio data head data after receiving the voice packet.
The invention has the beneficial effects that:
(1) The cost is low:
the function is an extended function of the whole earthquake early warning scheme, and the construction and operation cost of the system cannot be increased.
(2) Multi-platform intercommunication:
the terminal used by the user can be a control console of a Windows system or an interrupt-only device of an Android system, and a voice transmission channel can be established between the terminal and the wireless loudspeaker device no matter what interrupt device is adopted by the user, so that the real-time audio data packet can be received and can be normally played. Therefore, it is necessary to adopt a general communication technology means, a standardized audio format, and a standard data encryption means to ensure that the wireless public address device can acquire voice data from any terminal device and perform decryption and playing.
(3) Low latency, high concurrency:
the time delay of real-time voice transmission is less than 1 second, and the concurrent broadcasting of a plurality of wireless public address devices can be realized.
(4) And (3) data security:
because the wireless public address equipment operates in the public non-safety network environment, the data stream is required to be prevented from being stolen and tampered in the transmission process of the digital audio stream.
(5) The reconnection mechanism comprises:
the wireless network data transmission process may face risks of communication terminals at any time, and voice transmission is long, if necessary measures are not taken, once the communication is interrupted and reconnection is carried out, subsequent audio data cannot be normally decoded and listened due to loss of audio header information, so that a certain redundancy mechanism needs to be adopted on the premise of ensuring efficient transmission.
(6) Priority control:
the most important work of the wireless public address equipment is to receive earthquake early warning information in time and broadcast the early warning information, and the task is the highest priority task, namely: once the wireless public address equipment receives the earthquake early warning information, the terminal works currently to finish information settlement and broadcasting work.
Further: the terminal service platform comprises:
an instruction receiving unit: acquiring a state parameter query instruction for target intelligent equipment; wherein the content of the first and second substances,
the target smart device includes: a user terminal or wireless public address equipment;
the state parameter inquiry instruction is sent out by the user terminal or the wireless public address equipment;
a configuration file acquisition unit: determining a target configuration file corresponding to the target intelligent equipment based on the state parameter query instruction; wherein the content of the first and second substances,
each intelligent device is pre-configured with a corresponding configuration file;
a state parameter acquisition unit: polling the target intelligent device based on the target configuration file to obtain the current state parameter of the target intelligent device;
a state parameter transmitting unit: and when the state of the target intelligent equipment is determined to be changed according to the current state parameters, the current state parameters are sent to a user terminal or wireless public address equipment.
In the above technical scheme: in the process of voice data transmission, the method can monitor the state of equipment, namely the state of the user terminal and the wireless public address equipment, the user terminal can only acquire the state of the wireless public address equipment by using a LoRa communication mechanism or an earthquake early warning service platform of a system, and after the user terminal acquires the state information of the wireless public address equipment, the terminal initiates a real-time voice sending request to the wireless public address equipment; the wireless public address equipment receives the state of the user terminal and initiates network connection, and polling is a technical means for inquiring target intelligent equipment for multiple rounds.
The beneficial effects of the above technical scheme are that: the method and the device can judge the corresponding target intelligent equipment information and the corresponding target configuration file based on the instruction, namely the address information of the target intelligent equipment and the corresponding instruction file or the instruction program, acquire the state parameters of the target intelligent equipment through the program, and realize sound amplification alarm through the state parameters.
In specific implementation, polling the target smart device based on the target configuration file to obtain the current state parameter of the target smart device, further includes:
and substituting the functional characteristics of the target configuration file into the following formula to determine the parameter values of different state parameters of the target intelligent equipment:
Figure BDA0003756876070000101
wherein x is i A function characteristic value, y, representing the ith function of the target profile i Representing the state characteristic value of the target intelligent device under the ith function, wherein sigma represents the polling times of polling; k i Representing that a corresponding state parameter value of the target intelligent equipment under the ith function of the target configuration file is obtained after multiple polling; i belongs to a positive integer; a total of n functions;
in specific implementation, the state parameter sending unit further determines whether the state of the target smart device changes according to the following formula:
Figure BDA0003756876070000111
wherein n represents n functions, i.e. n state values; t is i Representing the function weight corresponding to the ith function of the target configuration file, which is also the state weight of the target intelligent equipment; k represents a referenceA state parameter; if Z is not 0, it indicates that the state of the target smart device has changed.
The above scheme is mainly to judge the state of the target intelligent device, but in actual implementation, a changed threshold value may be set according to needs, and no change in state is calculated within the threshold value, specifically considering the implementation result. By the judgment of judging whether the state changes, the sound amplification alarm can be realized.
And further: the user terminal module includes:
an audio acquisition unit: the system comprises a digital-to-analog converter, a digital-to-analog converter and a digital-to-analog converter, wherein the digital-to-analog converter is used for acquiring MIC sound of earthquake early warning and performing analog-to-digital conversion to a binary sequence;
an audio packaging unit: the audio head information is added at the beginning of the binary sequence for audio packaging; wherein, the first and the second end of the pipe are connected with each other,
the audio header information includes: the number of channels, sampling frequency and sampling number of bits;
a communication transmission unit: the method comprises the steps of constructing a P2P network constructed by WebSocket and constructing an asynchronous communication channel for data transmission;
a security authentication unit: the identity authentication is carried out when the broadcast initiator exists in the user terminal;
a safety connection unit: for setting up a transport layer security protocol at the asynchronous communication channel; wherein the content of the first and second substances,
the transport layer security protocol is used for recording the packaging format of the data and carrying out data integrity check;
a data encryption unit: the audio data after the audio package is encrypted through an AES algorithm.
In the above technical scheme: as shown in fig. 3, the real-time voice broadcasting function of the present invention needs to complete several operations such as audio acquisition, audio encapsulation, communication transmission, data encryption, decoding and playing. And carrying out binary conversion during audio acquisition, and packaging the audio with the audio head with data. The communication transmission constructs an asynchronous communication channel; and encrypting the data by AES encryption to encrypt audio data, and finally decoding and playing the data by wireless public address equipment.
The beneficial effects of the above technical scheme are that: the MIC sound is the microphone sound of the earthquake early warning equipment, the early warning information of the earthquake, including the position and earthquake magnitude of the earthquake and the like, can be judged through the sound, the binary conversion is used for rapidly transmitting information with home, and is also used for encrypting the transmitted information, the earthquake early warning signal is encrypted, and is easy to be subjected to external interference, the interference can be natural interference or artificial interference, so the encryption is required, the purpose of adding the audio head in the invention is to mark the sampled signal during transmission, and a P2P network constructed by WebSocket is adopted, so that the communication mode can realize faster and more stable signal transmission when asynchronous communication is realized. The safety certification is to ensure the accuracy of earthquake early warning information, and the safety protocol is to ensure that there is no signal mistransmission caused by data loss.
Further: the audio acquisition unit comprises the following analog-to-digital conversion steps:
presetting an analog-digital converter; wherein the content of the first and second substances,
the analog-to-digital converter comprises an analog-to-digital conversion process of potentially optimized audio data;
when audio data exist, code pages associated with analog-to-digital conversion are distributed in the analog-to-digital converter according to the analog-to-digital conversion flow; wherein the content of the first and second substances,
the code page contains a set of checkers, and each of the checkers corresponds to one of the instructions in the code page;
detecting a functional instruction having an instruction target within the code page;
incrementing one of the checkers in the code page having the same location as the instruction target in the code page;
repeating execution of the code page and incrementing the checker when an instruction target falls within the code page; and
and binary converting the value of the checker in the code page to the audio data.
In the above technical scheme: as shown in fig. 4, the audio signal is directly formed into a binary sequence through analog-to-digital conversion (a/D conversion), and these data have no additional header and end-of-file flag. The sound data in the data is not compressed, and if the data is a single-channel file, the sampling data are stored in sequence according to the time sequence. But only these digitized audio binary sequences cannot be played because any player does not know at what number of channels, sampling frequency and number of sampling bits this binary sequence should be played, and this binary sequence is not self-describing at all.
The beneficial effects of the above technical scheme are that: the analog-to-digital converter of the present invention comprises: the "potentially optimized analog-to-digital conversion process of the audio data" may firstly perform analog-to-digital conversion, and may secondly optimize the analog-to-digital conversion process, where the optimization is to record signals with the same frequency, and when the signals with the same frequency have, directly output corresponding information, and perform conversion in a different signal conversion manner, but directly compare and output the corresponding information. The analog-to-digital converter of the invention is provided with a code page, a plurality of different instructions are arranged in the code page, the instructions establish corresponding functions according to instruction targets, and the instructions comprise: the system comprises a plurality of different functional instructions such as a signal analysis instruction, a signal conversion instruction, a signal coding instruction, a signal filtering instruction and the like. The increasing of the checker is to poll the instructions in the code page, the polling is to realize multiple binary conversions and ensure the correctness of the conversion information, the checker is a code type checker, and the increasing checker is to realize the verification of the functional effect in the process of each polling.
Further: the audio packaging unit adding audio header information further comprises:
an identifier, DATA size, format type, fmt, sizeof, PCMWAVEFORMAT, DATA, sound DATA size, and sound DATA are added before the binary sequence.
In the above technical scheme: in the packaging process, audio header information used for representing information such as the number of channels, sampling frequency, sampling bit number and the like is added at the beginning of the audio data. The data can be played by basically all audio players, so that even if the audio data collected by different platforms adopts the standard packaged data and then is transmitted to the wireless loudspeaker device, the device can decode and play the audio data. The audio header information is as shown in fig. 5.
The beneficial effects of the above technical scheme are that: the more audio headers are added, the clearer the classification of the signal, fmt is a layout text file representing the layout of the signal. Sizeof is an operator for judging data type and expression length, PCMWAVEFORMAT represents that the sampling data is a sample represented by a 16-bit expression; DATA represents the signal content. By these forms, the audio header is allowed to reproduce all information of the signal, that is, all information of the audio data.
Further: the P2P network constructed by the WebSocket built by the communication transmission unit comprises the following steps:
newly building a control module, wherein the control module comprises a participation strategy module, and the participation strategy module is used for setting a WebSocket protocol;
the participation strategy module deduces and verifies the types of all the participation nodes according to the set node participation rule;
when the type of the participating node is A type, establishing P2P connection among all the participating nodes with the type of A type within a set time to form a fully-connected P2P network with the type of A, and marking the completion in the control module;
when the type of the participating node is B type, after the P2P network with the type of A is successfully constructed, P2P connection is established with part of the participating nodes of the A type or the B type within set time to form the P2P network with the type of B, and the marking is finished at the control module;
when the type of the participating node is C type, after the P2P network with the type of B is successfully constructed, P2P connection is established with a certain B type participating node within set time to form a P2P network with the type of C;
the P2P network with the type A, the P2P network with the type B and the P2P network with the type C form a complete dynamic heterogeneous P2P network.
In the above technical scheme: a P2P network constructed based on WebSocket is adopted to realize real-time transmission of audio data, and the WebSocket is a bidirectional full-duplex communication protocol initiated through an HTTP protocol. The WebSocket protocol is widely used in modern WEB programs for transmission of data streams and asynchronous communication. After the connection is created, the header of the data packet for protocol control is relatively small when data is exchanged between the server and the client. Without the inclusion of extensions, the header size for server-to-client content is only 2 bytes to 10 bytes (relative to the packet length); for client-to-server content, this header is additionally masked with 4 bytes. This overhead is significantly reduced compared to HTTP requests that each time carry a complete header. And the real-time performance is stronger. Because the protocol is full duplex, the server can actively give data to the client at any time. Compared with the HTTP request which needs to wait for the client to initiate the request and the server to respond, the WebSocket delay is significantly smaller. It can deliver data more times in a short time even compared to Comet and similar long polls. The WebSocket needs to create connection firstly, which is a stateful protocol, and then partial state information can be omitted during communication. And HTTP requests may need to carry state information (e.g., identity authentication, etc.) in each request. WebSocket defines binary frames that can handle binary content more easily than HTTP requests. The WebSocket defines extension, and a user can extend a protocol and realize a partially customized subprotocol. Compared with the HTTP compression, the WebSocket can follow the context of the previous content with proper extension support, and can significantly improve the compression rate when similar data is transferred. In the process of realizing the function, the following measures are adopted to ensure the safety of data.
The beneficial effects of the above technical scheme are that: in the process of constructing the P2P network, the invention can set a plurality of nodes, including A, B and C nodes, and can also set more nodes, particularly according to the actual technical requirements and the field situation. Because the dynamic heterogeneous P2P network is adopted, the synchronous transmission of data can be realized by the construction of the network, and the faster transmission of the data can also be realized.
Further: the data encryption unit for encrypting data comprises the following steps:
acquiring the audio data after audio packaging and taking the audio data as plaintext data;
encrypting the plaintext data through an AES encryption function, wherein the AES encryption function comprises a secret key K;
and obtaining the encrypted ciphertext C.
In the above technical scheme: we use the AES algorithm to encrypt the transmitted audio data. The Advanced Encryption Standard (AES) is the most common symmetric Encryption algorithm. Symmetric encryption algorithms use the same key for encryption and decryption. The encrypted key is generated by the Session, connection time and other information of the communication connection, and the keys of each communication connection are ensured to be different and not repeated.
Further: the wireless sound reproducing apparatus includes:
a device communication module: the asynchronous communication channel establishing module is used for connecting with the user terminal module, receiving an establishing request of an asynchronous communication channel and establishing the asynchronous communication channel;
a data decryption unit: the audio decryption module is used for decrypting the ciphertext C to generate audio decryption data;
an audio playing unit: for playing the audio decryption data.
The principle of the technical scheme is as follows: the invention can establish an asynchronous communication channel, and the cryptograph is decrypted through the channel to generate audio decryption data.
Further: the data decryption unit includes the decryption steps of:
receiving the ciphertext C;
decrypting the ciphertext C through an AES decryption function; wherein the content of the first and second substances,
the AES decryption function comprises a key K;
and acquiring the decrypted audio data.
Further: the audio playing unit includes:
loading a mode unit: the method is used for presetting a MODE _ STREAM loading MODE and a MODE _ STATIC loading MODE; wherein, the first and the second end of the pipe are connected with each other,
the MODE _ STREAM loading MODE is used for loading audio data into the AudioTrack;
the MODE _ STATIC loading MODE is used for loading audio data into an internal buffer area of the Audio track;
an analysis unit: the system comprises an AudioTrack, a data acquisition module, a data processing module and a data processing module, wherein the audio data acquisition module is used for acquiring audio data;
a broadcasting unit: for setting the MediaPlayer playback mode and the AudioTrack playback mode.
In the above technical scheme: the operating system of the wireless public address equipment is Android, namely an Android system. The AudioTrack belongs to a packaging layer and a playing mechanism, and can complete the task of playing and outputting audio data on an Android platform. The AudioTrack has two data loading MODEs (MODE _ STREAM and MODE _ STATIC, which belong to two streaming media MODEs), corresponding to the data loading MODE and the audio STREAM type, and corresponding to two completely different usage scenarios. MODE _ STREAM is applicable to most scenes, and passes audio buffers from the java layer to the native layer and returns. If the audio buffers occupy more memory, MODE _ STREAM should be used. For example, sound files with long playing time, such as audio files, use high sampling rate, such as dynamic processing audio buffer, etc., MODE _ STATIC transfers all audio resources from java to native layer at one time, which is a low delay but has limitations. The audio file is short and occupies small memory. The method is suitable for short game sound effects and has high requirements on the real playing delay. In addition, there are concepts of frame and frame count in the source code: the size of a frame is the number of channels x the sample size. The frame count is the number of frames that can be stored in the buffer.
MODE _ STREAM: in this mode, audio data is written to the AudioTrack once by write. This is similar to writing data to a file via a write system call in a just-in-time manner, but this mode of operation requires copying data from a user-supplied Buffer to a Buffer internal to the AudioTrack each time, which introduces some delay. To solve this problem, audioTrack has introduced a second mode.
MODE _ STATIC: in this mode, all data need only be transferred to the internal buffer in the AudioTrack with one write call before play, and no more data need be transferred subsequently. The mode is suitable for files with small memory occupation and high delay requirement, such as ring tones. It also has the disadvantage that the data at one write cannot be too much, otherwise the system cannot allocate enough memory to store the entire data.
The playback sound can be used with MediaPlayer and AudioTrack, both of which provide Java APIs for use by developers. Although both can play sound, the two are very different, the biggest difference is that the MediaPlayer can play sound files of various formats, such as MP3, AAC, WAV, OGG, MIDI, etc. MediaPlayer creates a corresponding audio decoder at the frame layer. While the AudioTrack can only play PCM streams that have already been decoded, it is an audio file that the AudioTrack only supports wav format if compared to the supported file format, because the audio file in wav format is mostly PCM streams. AudioTrack does not create a decoder, so only wav files that do not need to be decoded can be played.
It is necessary to decode the received audio data in a Stream manner. The wireless public address equipment needs to analyze audio head information after establishing an audio data transmission channel, constructs an AudioTrack according to audio description information, continuously pushes received audio to a cache of the AudioTrack to complete audio playing, and redundant information needs to be removed after the AudioTrack is initially completed due to the fact that audio data frames contain the redundant information in the secondary process.
If the audio data transmission connection is interrupted, the wireless loudspeaker equipment is required to close the AudioTrack to reinitiate the connection, and the process is completed again.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a thing networking loudspeaker voice broadcast system based on earthquake early warning which characterized in that includes:
a terminal service platform: the wireless public address equipment state query mechanism is used for configuring an equipment state query mechanism and sending equipment state information to the user terminal and the wireless public address equipment;
a user terminal module: the device is used for collecting MIC sound of the equipment when the state of the wireless public address equipment is normal, and encrypting and packaging the MIC sound into an audio digital packet;
the wireless public address equipment: and the audio digital packet is used for receiving the audio digital packet when the state of the user terminal is normal, and carrying out early warning broadcasting after decryption.
2. The internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 1, wherein the terminal service platform comprises:
an instruction receiving unit: acquiring a state parameter query instruction for target intelligent equipment; wherein the content of the first and second substances,
the target smart device includes: a user terminal or a wireless public address device;
the state parameter inquiry instruction is sent out by the user terminal or the wireless public address equipment;
a configuration file acquisition unit: determining a target configuration file corresponding to the target intelligent equipment based on the state parameter query instruction; wherein the content of the first and second substances,
each intelligent device is pre-configured with a corresponding configuration file;
a state parameter acquisition unit: polling the target intelligent device based on the target configuration file to obtain the current state parameter of the target intelligent device;
a state parameter transmitting unit: and when the state of the target intelligent equipment is determined to be changed according to the current state parameters, the current state parameters are sent to a user terminal or wireless public address equipment.
3. The internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 1, wherein the user terminal module comprises:
the audio acquisition unit: the system comprises a Microphone (MIC) sound acquisition unit, a data acquisition unit and a data processing unit, wherein the MIC sound acquisition unit is used for acquiring MIC sound of earthquake early warning and performing analog-to-digital conversion to a binary sequence;
an audio packaging unit: the audio head information is added at the beginning of the binary sequence for audio encapsulation; wherein the content of the first and second substances,
the audio header information includes: the number of channels, sampling frequency and sampling number of bits;
a communication transmission unit: the method comprises the steps of constructing a P2P network constructed by WebSocket and constructing an asynchronous communication channel for data transmission;
a security authentication unit: the identity authentication is carried out when the broadcast initiator exists in the user terminal;
a safety connection unit: for setting up a transport layer security protocol at the asynchronous communication channel; wherein the content of the first and second substances,
the transport layer security protocol is used for recording the packaging format of the data and carrying out data integrity check;
a data encryption unit: the audio data after the audio package is encrypted through an AES algorithm.
4. The Internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 3, wherein the audio acquisition unit comprises the following analog-to-digital conversion steps:
presetting an analog-digital converter; wherein the content of the first and second substances,
the analog-to-digital converter comprises an analog-to-digital conversion process of potentially optimized audio data;
when audio data exist, code pages associated with analog-to-digital conversion are distributed in the analog-to-digital converter according to the analog-to-digital conversion flow; wherein the content of the first and second substances,
the code page contains a set of checkers, and each of the checkers corresponds to an instruction in the code page;
and detecting a functional instruction of an instruction target within the code page;
incrementing one of the checkers in the code page having the same location as the instruction target in the code page;
repeating execution of the code page and incrementing the checker when an instruction target falls within the code page; and
and binary converting the value of the checker in the code page to the audio data.
5. The internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 3, wherein the audio packaging unit adding audio header information further comprises:
an identifier, DATA size, format type, fmt, sizeof, PCMWAVEFORMAT, DATA, sound DATA size, and sound DATA are added before the binary sequence.
6. The Internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 1, wherein the communication transmission unit builds a P2P network constructed by WebSocket, and the P2P network comprises the following steps:
newly building a control module, wherein the control module comprises a participation strategy module, and the participation strategy module is used for setting a WebSocket protocol;
the participation strategy module deduces and verifies the types of all the participation nodes according to the set node participation rule;
when the type of the participating node is A type, establishing P2P connection among all the participating nodes with the type of A type within set time to form a fully-connected P2P network with the type of A, and marking completion in the control module;
when the type of the participating node is B type, after the P2P network with the type of A is successfully constructed, P2P connection is established with part of the participating nodes of the A type or the B type within set time to form the P2P network with the type of B, and the marking is finished at the control module;
when the type of the participating node is C type, after the P2P network with the type of B is successfully constructed, P2P connection is established with a certain B type participating node within set time to form a P2P network with the type of C;
the P2P network with the type A, the P2P network with the type B and the P2P network with the type C form a complete dynamic heterogeneous P2P network.
7. The Internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 3, wherein the data encryption unit for encrypting data comprises the following steps:
acquiring the audio data after audio packaging, and taking the audio data as plaintext data;
encrypting the plaintext data through an AES encryption function, wherein the AES encryption function comprises a secret key K;
and obtaining the encrypted ciphertext C.
8. The internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 7, wherein the wireless public address device comprises:
a device communication module: the asynchronous communication channel establishing device is used for being connected with the user terminal module, receiving an establishing request of an asynchronous communication channel and establishing the asynchronous communication channel;
a data decryption unit: the audio decryption module is used for decrypting the ciphertext C to generate audio decryption data;
an audio playing unit: for playing the audio decryption data.
9. The Internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 7, wherein the data decryption unit comprises the following decryption steps:
receiving the ciphertext C;
decrypting the ciphertext C through an AES decryption function; wherein the content of the first and second substances,
the AES decryption function includes a key K;
and acquiring the decrypted audio data.
10. The internet of things loudspeaker voice broadcasting system based on earthquake early warning as claimed in claim 7, wherein the audio playing unit comprises:
loading a mode unit: the method is used for presetting a MODE _ STREAM loading MODE and a MODE _ STATIC loading MODE; wherein the content of the first and second substances,
the MODE _ STREAM loading MODE is used for loading audio data into the Audio track;
the MODE _ STATIC loading MODE is used for loading audio data into an internal buffer area of the Audio track;
an analysis unit: the system comprises an AudioTrack, a data acquisition module, a data processing module and a data processing module, wherein the audio data acquisition module is used for acquiring audio data;
a broadcasting unit: for setting the MediaPlayer playback mode and the AudioTrack playback mode.
CN202210865305.3A 2022-07-21 2022-07-21 Internet of things loudspeaker voice broadcasting system based on earthquake early warning Pending CN115240369A (en)

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CN113921011A (en) * 2021-10-14 2022-01-11 安徽听见科技有限公司 Audio processing method, device and equipment
CN114357489A (en) * 2022-01-05 2022-04-15 广州优谷信息技术有限公司 Audio double-encryption system
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CN104205088A (en) * 2012-03-30 2014-12-10 英特尔公司 Hardware profiling mechanism to enable page level automatic binary translation
CN104883234A (en) * 2014-07-16 2015-09-02 北京华辰泽众信息科技有限公司 Warning information publishing terminal
CN107135043A (en) * 2017-05-05 2017-09-05 中广热点云科技有限公司 Public emergency broadcast system
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