KR20210075711A - Wireless broadcasting system - Google Patents

Abstract

The present invention relates to a wireless broadcasting system. The wireless broadcasting system, which receives broadcast content from a manager and transmits the same to a remote place, includes: a transmitting part receiving the broadcast content and outputting the same in frequency bands of 400MHz and 900MHz to process the broadcast content as a wireless signal and digitize the same to transmit the same; a receiving part receiving the broadcast content transmitted from the transmitting part, and including a storage part pre-storing a sound in accordance with the broadcast content; and a speaker outputting the broadcast content received from the receiving part as a voice. According to the present invention, the wireless broadcasting system using a 400MHz & 900MHz dual band is the best solution because it is convenient to operate and easy to maintain, and can completely solve problems of a system currently in operation, enabling broadcasting with a self-power source in case of a power failure caused by a disaster.

Description

Wireless broadcasting system {Wireless broadcasting system}

The present invention relates to a wireless broadcasting system, and more particularly, to a wireless broadcasting system that transmits broadcasting contents such as natural or social disaster disaster emdr based on a single band of 400Mhz or more and a single band of 900Mhz or more.

In general, disaster broadcasting should deliver accurate information promptly in disasters and disaster situations. Ultimately, it should be possible to minimize the damage by effectively providing the information necessary to protect the lives and property of victims and the general public.

Currently, loudspeaker-only systems in use in cities/guns/gus have operational difficulties due to various problems such as the occurrence of hearing loss households and disconnection of speaker wires according to weather conditions during normal times and disasters. The need for a method to solve such a problem has been raised, but an appropriate countermeasure has not been established.

Therefore, with the current disaster broadcasting system, it is difficult to successfully achieve any of the up-to-dateness, accuracy, and damage prevention of information, so disasters and disasters are expected to become more complex and frequent in the future.

In particular, the method using 2.4 GHz as the main frequency transmits and receives media data (video, large-capacity data, etc.) rather than voice or information data, and transmits voice data using low frequency bands of 400 MHz and 900 MHz. The technology is still immature.

In addition, the technology that uses the existing 400MHz band and 900MHz band dually has not yet been developed, and most of the patented technologies using the respective frequencies of the 400MHz and 900MHz bands mainly use communication data rather than voice data, and disaster guidance There is no technology in use in the broadcasting system either.

Korean Patent Publication No. 2013-0093835 Korean Patent Publication No. 2011-0062375 Korean Patent Publication No. 2009-0074633

Therefore, the present invention is a system using a dual band band of 400 MHz and 900 MHz, which has excellent operability, is easy to maintain, and can provide a broadcasting system capable of broadcasting using its own power source in the event of a power outage due to a disaster, etc. aim to

Another object of the present invention is to provide a wireless broadcasting system having high synchronization and high-efficiency propagation characteristics, a long radio wave reach, and excellent diffraction properties.

In addition, it aims to provide a wireless broadcasting system with innovatively improved cost and function by using a Raspberry-pi that applies a touch screen for user convenience and can store broadcast contents.

In order to solve this problem, the present invention provides a wireless broadcasting system for receiving broadcast content from an administrator and transmitting the broadcast content to a remote location,

A transmitter that receives the broadcast content, outputs it in a frequency band of 400 MHz and a frequency band of 900 MHz, processes the radio signal, converts the broadcast content to digital, and transmits, and receives the broadcast content transmitted from the transmitter, according to the broadcast content. It characterized in that it comprises a receiving unit including a storage unit for storing the sound in advance, and a speaker for outputting the broadcast contents received in the receiving unit as a voice.

In addition, the transmitter encodes or decodes a digital data stream from the Raspberry Pi and audio, and transmits broadcast contents from the touch screen formed on the surface of the transmitter and the Raspberry Pi so that an audio codec and a broadcast channel to be transmitted to the Raspberry Pi can be selected. It is characterized in that it is composed of an RF module for USN that transmits to the antenna and a power supply unit for supplying power to the transmitter.

In addition, the Raspberry Pi digitizes the audio signal and transmits it as a message.

And, when a request for re-listening of broadcast content is received by the transmitter, the transmitter directly retransmits the request to the corresponding receiver.

And, the transmitter is characterized in that it further comprises a changeover switch for switching the relay mode and the transmission/reception mode.

Therefore, the present invention can supplement the disadvantages of the outdoor speaker, and by applying the touch screen method, it is easy to operate and easy to maintain, and it is possible to provide a wireless broadcasting system with a wide range and excellent usability due to various additional functions. it has an effect.

1 is a photograph showing a schematic configuration of a wireless broadcasting system according to the present invention.
2 is a block diagram of a wireless broadcasting system according to the present invention;
3 is a block diagram of a transmitter according to an embodiment of the present invention;
4 is a diagram showing the setting procedure and procedure of an audio codec.
5 is a photograph of an RF module according to an embodiment of the present invention;
6 is a flowchart of a method for operating a wireless broadcasting system according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are marked on different drawings.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, since the terms used in the present application are only used to describe specific embodiments, it is not intended to limit the present invention, and the singular expression means a plural expression unless the context clearly indicates otherwise. we want to leave

Hereinafter, preferred embodiments according to the present invention will be described with accompanying drawings.

1 is a photograph showing a schematic configuration of a wireless broadcasting system according to the present invention, FIG. 2 is a configuration block diagram of a wireless broadcasting system according to the present invention, and FIG. 3 is a block diagram of a transmitter according to an embodiment of the present invention; FIG. 4 is a sequence and procedure diagram of an audio codec, FIG. 5 is a picture of an RF module according to an embodiment of the present invention, and FIG. 6 is a flowchart of a method of operating a wireless broadcasting system according to the present invention.

An approximate configuration relationship of the present invention will be described with reference to FIG. 1 . As shown in the picture, the construction of a wireless broadcasting system using a transmitter and a receiver is

First, there is a broadcasting device that quickly and accurately delivers announcements, disaster situations, farming information, etc. by voice through a wireless speaker installed in the house in the form of a village broadcasting (house to house type).

Second, in the form of village broadcasting, parks, amusement parks, amusement parks, etc. (loudphone type), in case of disasters such as heavy rain and strong winds, it is wirelessly amplified (digital) as a disaster disaster forecasting or warning system with automatic forecasting and warning broadcasting functions By installing speakers in various places, it is used for announcements such as finding lost children and storing lost items, and has the advantage of being convenient to install and move.

Third, as a separate broadcasting system for schools and government offices, there is a system capable of broadcasting in any form, such as all broadcasting, group broadcasting, individual broadcasting, indoor broadcasting, and outdoor broadcasting.

2 is a block diagram of a wireless broadcasting system 100 according to the present invention. Referring to the drawing, it is mainly arranged in a public place to receive broadcast content from an administrator, and digitally modulates the broadcast content to transmit the broadcast content to a remote location. It is a block diagram showing the overall configuration of the wireless broadcasting system 100.

Accordingly, the overall configuration is largely composed of a transmitter 10 , a receiver 20 , and a speaker 30 .

The transmitter 10 receives the broadcast content and outputs it in a frequency band of 400 MHz and 900 MHz, and processes the radio signal to convert the broadcast content to digital and transmit it.

In addition, the receiving unit 20 including a storage unit (not shown) for receiving the contents from the transmitting unit 10 that transmits the broadcasting contents, and storing the sound according to the broadcasting contents in advance is formed.

Next, a speaker 30 for outputting the broadcast contents received by the receiver 20 as voice is formed.

Hereinafter, with reference to FIG. 3, the configuration, operation relationship and effects of the village broadcasting system 100 according to the present invention will be described.

The transmitter 10 adopts a digital code authentication method with the speaker 30, which is a component of the receiver 20 and an outdoor broadcasting device (not shown), so that interference with each other can be prevented.

The transmitter 10 can set an emergency code, set a channel, set a color code, set a group belonging to each channel, and select a specific group from among the set groups.

The channel setting refers to frequency setting, and in order to communicate, the receiver 20 and the channel must first match.

In addition, since the transmitter 10 transmits broadcast content after modulation with a digital code, a color code may be added to the broadcast data packet. Because of the color code, there is no interference even if the frequency is the same or frequency interference occurs.

In addition, the transmitter 10 includes a changeover switch (not shown) for switching between a relay mode and a transmission/reception mode.

That is, even if the channels match, if the color codes are different, broadcasts are not received. Therefore, interference does not occur when the same color codes are used.

Transmission is performed automatically as soon as the broadcast content is received. Specifically, the transmitter 10 has a built-in RF communication module 16 for USN (Ubiquitous Sensor Network) that transmits the broadcast content. (For reference, the RF communication module 16 is also built in the receiver 20.)

The RF communication module 16 may transmit information, such as voice, at a high transmission rate in a broadband communication method using a radio frequency.

Specifically, the RF communication module 16 may transmit/receive broadcast contents through the antenna 15 .

The transmitter 10 may use only some of the plurality of frequency channels to prevent interference. In addition, a plurality of specific groups can be set for each channel, and some of them can be selected or deselected.

Meanwhile, the transmitter 10 includes a controller (not shown) that receives data received from the RF communication module 16 and processes it. At this time, the data exchanged and transmitted inside the transmitter 10 is performed through general-purpose asynchronous transmission/reception. In other words, it converts parallel data to a serial method to send and receive data in an asynchronous communication method.

The emergency situation type code is a literal type of emergency situation, that is, a code that specifies a disaster situation such as war, typhoon, and radiation leakage. The transmitter 10 may not only set an emergency code, but also transmit the emergency type code to the receiver 20 and the speaker 30 .

Referring back to the drawing, the transmission unit 10 includes a Raspberry Pi 11 that controls all of the components included in the transmission unit 10 , as if it functions as a central control unit.

The Raspberry Pi 11 functions as a miniature computer, and can control messages transmitted by adding an external switch or sensor (not shown) to the Raspberry Pi 11 as a Linux operating system. In addition, it is possible to restore the broadcast content.

In addition, the Raspberry Pi 11 can digitize the signal of the audio 12 and transmit it in the form of a message.

In addition, an audio codec 13 is formed that encodes or decodes a digital data stream from the audio 12 and transmits it to the Raspberry Pi 11 .

The audio codec 13 is a PCM (pulse-code modulation) codec used by applying a waveform compression method in audio compression. It processes analog audio as it is in the original sound by ADC (Analog to Digital Converter) and compresses the audio data. DAC (Digital to Analog Converter) processing to be close to the original sound.

The setting sequence and procedure of the audio codec 13 are as shown in FIG. 4,

First, the step of resetting the software, the step of interfacing with the PLL circuit (not shown) in the clock divider, the step of forming using a processing block (not shown) or mini DSP (Digital Signal Processing: not shown) and supplying power It includes the step of forming power by tuning, the step of transmitting by connecting to a TX (transmitter) channel, and the step of connecting and transmitting through the RX (receiver) channel.

Therefore, by adopting a PLL (Phase Locked Loop) circuit, which is a programmable phase-locked circuit, noise is prevented and more flexible audio settings are possible.

ADC that converts the audio signal received from the microphone (not shown) into a digital signal and a DAC module (not shown) that converts the digital signal into an analog signal are equipped. control) function.

A touch screen 14 formed on the surface of the transmitter 10 is formed so that a broadcast channel can be easily selected. Simple use is possible by forming the touch screen 14 .

An RF module 16 for USN that transmits broadcast contents from the Raspberry Pi 11 and transmits it to the antenna 15 is formed. (See Fig. 5)

The RF module 16 employs a dual band of 400 MHz and 900 MHz bands, and uses relatively low 400 MHz and 900 MHz, unlike the high frequency of 2.4 GHz, which is implemented by a general broadcasting system, which is very simple. It has the advantage of being able to broadcast broadcasts even on the street. That is, the lower the frequency, the wider the range of radio waves. To explain this in more detail, in the case of 900 MHz, it is possible to listen to a range of 5 to 10 km, and in the case of 400 MHz, it is possible to listen at a distance of 10 km or more.

As such, the RF module 16 has a rated output of 10 mW, 25 mW, and 200 mW, and it can be used in various fields such as medical, industrial, transportation, and natural disaster detection in advance by developing a module capable of long-distance wireless communication of about 50 m to 10 km. There is this.

In addition, the RF module 16 is capable of observing the state of machinery in the industrial site or the flow of production, measuring the slope of the bridge to monitor the bridge collapse in advance, observing the trees in the forest to detect a forest fire, The patient's health status can also be monitored in real time.

Furthermore, it can be usefully used for a variety of '4th Industrial Revolution IoT products' in daily life, such as smart buildings, electronic meter reading, product loss prevention, and companion animal care. In addition, it is designed in a low power consumption method boasting a low power consumption, so it has the advantage of lasting several years of battery life.

And, it is composed of a power supply unit (17: Power supply) for supplying power to the entire transmission unit (10). Although it is common to use electric power, the power supply unit 17 may have its own generator installed to be used even during a power outage, and can be used in an emergency by charging through a battery.

The receiver 20 shown in FIG. 3 receives broadcast contents from the transmitter 10, and the RF module 16 is formed therein.

The receiver 20 enables simultaneous listening in a wide place and indoors through a wireless large loudspeaker (not shown) and a small receiver (not shown), and can broadcast even during a power outage with a built-in lithium battery, charging device, and solar power generation function Do.

In addition, the receiving unit 20 may transmit the state of charge of the battery, the state of the reception sensitivity, and the like to the transmitting unit 10 .

And, when a request to re-listen to the broadcast content is received, the transmitter 10 directly retransmits the request from the transmitter 10 to the corresponding receiver 20 . That is, when the broadcast cannot be listened to, if there is a request for retransmission to the receiver 20 , it is re-outputted to the speaker 30 . Therefore, if the contents of the broadcast cannot be heard, it is possible to re-listen.

Accordingly, the village broadcasting system 100 according to the present invention is easy to install, has a significant effect of reducing facility construction and maintenance costs, flexibility for application to various wireless systems, and ease of network scalability, It is possible to promote the ease of management and operation through remote control.

In addition, broadcasting is possible using wired or wireless telephones anywhere in the country, such as administrative offices or village heads, and it is possible to listen through outdoor wireless speakers in mountains and fields, and home receivers at home. There is also the effect of being able to listen again.

Hereinafter, an operating method of the wireless broadcasting system 100 according to the present invention will be described with reference to FIG. 6 .

The control method of the wireless broadcasting system 100 includes a receiving step (s10), a converting step (s20), a storing step (s30), and a reproducing step (s40) as shown.

Specifically, the transmitter 10, which is a component of the village broadcasting system 100, can store the broadcast content when it receives the broadcast content through the built-in Raspberry Pi 11, and press the play button later to listen to the broadcast content again. .

The receiving step (s10) is a step of receiving broadcast contents transmitted to the receiver 20 through the Raspberry Pi 11 disposed in the transmitter 10 . Broadcast content is received in any one state selected from compressed and uncompressed.

Next, the converting step (s20) is a step of converting the broadcast content into a digital audio signal by transmitting the broadcast content to the audio codec 16. When broadcast content is transmitted in a compressed state, it is first released and then converted into a digital audio signal.

Next, the storing step (s30) is a step of transmitting and storing the digital audio signal to the Raspberry Pi 11 .

That is, the Raspberry Pi 11 controlling the transmitter 10 immediately transmits the digital audio signal to its internal memory (not shown). As a result, the digital audio signal can be directly stored in a digital manner, thereby preventing the deterioration of sound quality.

This is because the general technology of the conventional wireless broadcasting system converts the digital audio signal into an analog audio signal as it is transmitted from the IC chip to the codec, and then the CPU converts it back to an analog-to-digital converter (not shown). It improves the method of reconverting the digital signal by using it and storing it in the memory unit.

In the storing step (s30), the digital audio signal may be stored in an audio compressed file format. For example, the storage file may have a file extension such as mp3 or mp4. In addition, in the storing step, the received date and time may be recorded and stored in the audio compressed file. This provides information about when the broadcast content is received when the broadcast content is reproduced.

Next, the reproducing step (s40) is a step of re-listening the broadcast content by pressing the replay button disposed on the transmitter 10 . This provides an opportunity for residents to listen to the broadcast again in case it was not able to listen to the broadcast in real time due to absence.

Specifically, the reproducing step (s40) includes a step (s42) of directly retransmitting the stored digital audio signal to the receiving unit 20 . This is done by the Raspberry Pi 11 of the transmitter 10, and when a request to re-listen to the broadcast content is received, the transmitter 10 directly retransmits to the receiver 20 corresponding to the transmitter 10. will be.

After the retransmission step (s42), the digital audio signal is transmitted to the Raspberry Pi 11 through the audio codec 13, the contents are transmitted to the receiver 20 through the antenna 15, and output through the speaker 30 It further includes a step (s44) of doing.

That is, the received broadcast content is converted into a digital audio signal and then stored in the memory of the Raspberry Pi 11 in that state, and when reproduced, the audio codec 13 converts the digital audio signal into an analog audio signal only.

Next, the analog audio signal converted by the audio codec 13 is outputted through the amplifier (not shown) or the speaker 30 through the receiver 20 .

Those skilled in the art to which the present invention pertains as described above will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative and not restrictive.

The scope of the present invention is indicated by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

10: transmitter
11: Raspberry Pi
12: Audio
13: Audio Codec
14: touch screen
15: antenna
16: RF module
17: power supply
20: receiver
30: speaker
100: wireless broadcasting system

Claims (4)

A wireless broadcasting system for receiving broadcast content from a manager and transmitting the broadcast content to a remote location, the wireless broadcasting system comprising:
a transmitter for receiving the broadcast content, outputting the broadcast content in a frequency band of 400 MHz and 900 MHz, processing the radio signal, converting the broadcast content to digital, and transmitting; a receiving unit including a storage unit for receiving broadcast contents transmitted from the transmitting unit and storing in advance sound according to the broadcast contents; and
and a speaker for outputting the broadcast contents received by the receiver as voice.
The method of claim 1, wherein the transmitter
Raspberry Pi;
an audio codec that encodes or decodes a digital data stream from audio and transmits it to the Raspberry Pi;
a touch screen formed on the surface of the transmitter to select a broadcast channel;
an RF module for USN for transmitting broadcast contents from the Raspberry Pi to an antenna;
and a power supply unit for supplying power to the transmitting unit.
3. The method of claim 1 or 2,
The Raspberry Pi digitizes the audio signal and transmits it as a message.
According to claim 1,
and the transmitter directly retransmits a request for re-listening to the broadcast content from the transmitter to the corresponding receiver when a request for re-listening is received.

Images