Medium-wave emergency broadcast transmission system capable of simultaneously sending sound signal and control signal
By designing the medium-wave emergency broadcast transmission system, the problem that the medium-wave broadcast system cannot send emergency control signals in emergency situations is solved, and the emergency broadcast coverage is achieved when the power grid is interrupted and communication is paralyzed. The characteristics of medium-wave broadcasting are used not to interfere with sound The signal has a wide coverage and can convey emergency information in a timely manner and reduce casualties.
Patent Information
- Application Number
- CN202411526574.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-01-03
AI Technical Summary
The existing medium-wave broadcasting system can only send sound signals and cannot send emergency control signals when the power grid is interrupted and the communication network is paralyzed, resulting in the inability to convey disaster warning information in a timely manner, especially the dangers of sleeping people cannot be reminded at night.
A medium-wave emergency broadcast transmission system is designed, including a signal transmission module and a signal reception module, which transmits emergency control signals through the encoding and compression unit, frequency modulation unit, signal mixing unit and medium-wave amplitude modulation transmitting unit, and passes through high-frequency amplifier and frequency converter , broadband medium frequency signal amplifier, detector, filter amplification shaping circuit, frequency detector, signal decompression unit, microcontroller unit and power management controller reception module to realize the transmission and reception of emergency broadcast signals, and take advantage of the unique characteristics of medium wave broadcasting. It does not interfere with sound signals, has a wide coverage, and is simple and portable.
It realizes the simultaneous transmission of sound signals and control signals in emergency situations. It uses existing medium-wave radio station equipment, with a large coverage range, can turn on the radio in real time, issue alarm sounds and emergency information, and reduce casualties and property losses, especially at night Wake up the sleeping people in time.
Smart Images
Figure CN119254362A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of medium wave broadcasting, in particular to a medium wave emergency broadcasting transmission system capable of sending a sound signal and a control signal simultaneously. Background Art
[0002] With the development of radio and television and the country's high attention to the personal safety of residents in geological disaster areas and early warning systems, various broadcasting organizations insert early warning information of geological disasters in various transmission methods of radio and television, which plays a role in providing disaster warning information to residents in mountainous and remote areas in various ways in practical applications. The current emergency broadcast information is mainly transmitted through the RDS channel of the FM band, the TS stream channel of satellite and digital terrestrial television, and the data broadcast channel of digital audio broadcasting, which has not yet been implemented in the medium wave broadcasting system.
[0003] Most of the current emergency broadcasts are done by erecting a pole in each village with a loudspeaker attached, and using various existing networks to send emergency broadcast signals to the FM loudspeakers in each village. However, once a major disaster emergency occurs, it is often accompanied by a power grid outage and no electricity supply. All these emergency facilities that require electricity cannot be used, as well as mobile phones. The entire communication network is paralyzed and information cannot flow. At the same time, the existing medium-wave broadcast transmission system can only send sound signals. Users cannot hear the emergency broadcast sound if they do not turn on the radio, especially for people who sleep at night, who do not know that danger is approaching. Summary of the invention
[0004] The object of the present invention is to provide a medium wave emergency broadcast transmission system which can send voice signals and control signals simultaneously, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above object, the present invention provides the following technical solution: a medium wave emergency broadcast transmission system capable of simultaneously sending a sound signal and a control signal, the system comprising:
[0006] A signal sending module and a signal receiving module, wherein the signal sending module includes a coding compression unit, a frequency modulation unit, a signal mixing unit and a medium wave amplitude modulation transmitting unit; the signal receiving module includes two signal branches, namely a normal working path and an emergency working path; the normal working path includes: a high-frequency amplifier, a frequency converter, a broadband intermediate frequency signal amplifier, an intermediate frequency signal amplifier 1, a detector 1 and an audio amplifier; the emergency working path includes: a high-frequency amplifier, a frequency converter, a broadband intermediate frequency signal amplifier, a detector 2, a filtering amplification and shaping circuit, a frequency discriminator, a signal decompression unit, a micro control unit (MCU), a TF card reader and a power management controller.
[0007] Preferably: the control signal of the emergency broadcast is sent through the signal sending module; the control signal of the emergency broadcast is compressed by the coding compression unit to process the code of the disaster occurrence address output by the computer, and then sent to the FM unit with a carrier frequency of 6.5KHZ for FM processing, and then sent to the signal mixing unit to mix with the broadcast audio signal to generate a group signal, which is sent through the medium wave amplitude modulation transmitting unit.
[0008] Preferably: the normal working path signal branch of the signal receiving module receives the medium wave broadcast signal through the antenna and sequentially sends it to the high frequency amplifier, the frequency converter, the broadband intermediate frequency signal amplifier, the intermediate frequency signal amplifier 1, the detector 1, the audio amplifier and the speaker for sound production.
[0009] Preferably: the emergency working channel signal branch of the signal receiving module receives the control signal for starting the emergency broadcast sent by the medium wave broadcasting station through the antenna, and sends it to the micro control unit in sequence through the high-frequency amplifier, the frequency converter, the broadband intermediate frequency signal amplifier, the detector 2, the filter amplification and shaping circuit, the frequency discriminator, and the signal decompression unit. After being compared with the address code of the TF card reader, if they are consistent, the micro control unit sends a power-on signal to the power management controller to start the audio information playback.
[0010] The signal receiving module sends the received medium wave broadcast signal to the high frequency amplifier, frequency converter, and broadband intermediate frequency signal amplifier in sequence, and then the signal is divided into two paths. The signal in the signal branch of the normal working path (national standard bandwidth plus or minus 4.5KHZ) is filtered out by the intermediate frequency signal amplifier 1 to remove the signal above 4.5KHZ, and then sent to the detector 1 to detect the sound signal, and then input into the audio amplifier and sent to the speaker to sound and play the broadcast content. If there is an emergency broadcast control signal, the signal in the other signal branch is detected by the detector 2 to obtain the group signal (a mixed signal of the broadcast audio signal and the control signal), and then sent to the filter amplification shaping circuit to use the high-pass filter to filter out the sound signal below 4.5KHZ, and then sent to the discriminator to demodulate the compressed emergency broadcast control signal, and then sent to the signal decompression unit to restore it to the initial digital address coding signal after decompression, and sent to the micro control unit and the address code stored in the TF card for comparison after error correction. After the two address codes are consistent, the micro control unit sends a power-on signal to the power manager (to power the audio amplifier) to start the audio information (emergency broadcast information) playback.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] The medium wave emergency broadcast transmission system of the present invention can send sound signals and control signals at the same time. The control signal of the emergency broadcast sent by the system utilizes the idle band in the band occupied by the existing medium wave broadcast, and the modulation system accounts for only 10%. Therefore, the control signal of the emergency broadcast does not interfere with the sound broadcast. The system also utilizes the unique characteristics of medium wave broadcasting, such as long propagation distance, strong diffraction ability, wide coverage, simple structure of the receiving equipment radio, small size and easy to carry, and mobile reception in vehicles. The system can utilize the equipment of the existing medium wave radio station, with low investment, and has a wide coverage covering almost all cities and towns in the country, so as to achieve the coverage of emergency broadcasting in a large area (within a radius of several hundred kilometers).
[0013] The signal frequency bandwidth sent by the medium wave broadcast transmission system of the present invention can reach more than ±8KHZ.
[0014] The present invention uses the control signal sent by the radio station to turn on the user's radio in real time, send out an alarm sound of more than 3W and an emergency alarm, and broadcast emergency information, so as to realize the emergency escape of people and reduce casualties and property losses. Especially at night, it can wake up sleeping people, listen to the emergency broadcast, and escape in time. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the transmitting module of the present invention;
[0016] Figure 2 It is a schematic diagram of the working path of the receiving module of the present invention. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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.
[0018] Embodiment 1
[0019] See also Figure 1-Figure 2, the figure shows a medium wave emergency broadcast transmission system that can simultaneously send sound signals and control signals. The system includes a signal sending module and a signal receiving module. The signal sending module includes a coding compression unit, a frequency modulation unit, a signal mixing unit and a medium wave amplitude modulation transmitting unit; the signal receiving module includes two signal branches, a normal working path and an emergency working path; the normal working path includes: a high-frequency amplifier, a frequency converter, a broadband intermediate frequency signal amplifier, an intermediate frequency signal amplifier 1, a detector 1 and an audio amplifier; the emergency working path includes: a high-frequency amplifier, a frequency converter, a broadband intermediate frequency signal amplifier, a detector 2, a filtering amplification and shaping circuit, a frequency discriminator, a signal decompression unit, a micro control unit (MCU), a TF card reader and a power management controller.
[0020] The control signal of the emergency broadcast is sent out through the signal sending module; the control signal of the emergency broadcast is compressed by the coding compression unit to process the code of the disaster occurrence address output by the computer (the village can be used as the basic unit), and then sent to the frequency modulation unit with a carrier frequency of 6.5KHZ for M<20% frequency modulation processing, and the modulation amplitude of the main carrier signal does not exceed 10%, and then sent to the signal mixing unit to mix with the broadcast audio signal to generate a group signal, which is sent out through the medium wave amplitude modulation transmitting unit.
[0021] The normal working path signal branch of the signal receiving module receives the medium wave broadcast signal through the antenna, and then passes through the high frequency amplifier, the frequency converter, the broadband intermediate frequency signal amplifier, the intermediate frequency signal amplifier 1, the detector 1, and the audio amplifier in sequence to send the signal to the speaker for sound generation.
[0022] The emergency working channel signal branch of the signal receiving module receives the control signal for starting the emergency broadcast sent by the medium wave radio station through the antenna, and sends it to the micro control unit in sequence through the high-frequency amplifier, frequency converter, broadband intermediate frequency signal amplifier, detector 2, filter amplification and shaping circuit, frequency discriminator, and signal decompression unit. After being compared with the TF card reader address code, if they are consistent, the micro control unit sends a power-on signal to the power management controller to start the audio information playback.
[0023] The signal receiving module sends the received medium wave broadcast signal to the high frequency amplifier, frequency converter, and broadband intermediate frequency signal amplifier in sequence, and then the signal is divided into two paths. The signal in the signal branch of the normal working path is filtered by the intermediate frequency signal amplifier 1 to remove the signal above 4.5KHZ, and then sent to the detector 1 to detect the sound signal, and then input into the audio amplifier, and sent to the speaker to sound and play the broadcast content. If there is an emergency broadcast control signal, the signal in the other signal branch is detected by the detector 2 to obtain the group signal (a mixed signal of the broadcast audio signal and the control signal), and then sent to the filter amplification shaping circuit to use the high-pass filter to filter out the sound signal below 4.5KHZ, and then sent to the discriminator to demodulate the compressed emergency broadcast control signal, and then sent to the signal decompression unit to restore it to the initial digital address coding signal after decompression, and sent to the micro control unit and the address code stored in the TF card for comparison after error correction. After the two address codes are consistent, the micro control unit sends a power-on signal to the power manager to start the audio information (emergency broadcast information) playback. If the received address code is inconsistent with the address code stored in the TF card, the micro control unit does not send a power-on signal to the power manager, the audio amplifier is not powered on, and the speaker does not make any sound.
[0024] The high frequency amplifier, frequency converter and broadband intermediate frequency signal amplifier in the signal receiving module are the common channels of the two branches.
[0025] The signal receiving module (radio) needs to be connected to a power supply device.
[0026] Only in an emergency, the sending module sends a control signal with an emergency broadcast, and the signal receiving module (medium wave radio) will control the power manager to start playing audio information.
[0027] The power source can be a solar cell, a lithium battery, a dry cell or an alternating current. The signal receiving module (radio) can use a digital tuning circuit chip with automatic station selection and memory functions.
[0028] The receiving module (medium wave radio) has a high-frequency amplifier circuit and a frequency conversion circuit that can automatically select channels and has a memory function.
[0029] When the receiver is in emergency state, the medium wave radio station sends a control signal to start the emergency broadcast, and the medium wave broadcast signal received by the antenna. For example, the signal frequency of Jiamusi People's Broadcasting Station is 666KHZ, which is sent to the high frequency amplifier for tuning and amplification. The bandwidth of the high frequency amplifier is 666kHz. After 8kHz frequency conversion, the bandwidth of the broadband intermediate frequency signal amplifier is 465KHZ±8KHZ; the bandwidth of the intermediate frequency signal amplifier 1 is 465kHZ±4.5Khz.
[0030] Since the present invention is carried out in the baseband part of the sound of the medium wave broadcasting transmitter and does not involve the subsequent parts, it is applicable to various types of medium wave broadcasting transmitters, whether DAM digital modular or PDM. As long as a device with the system of the present invention is connected before the sound input end, emergency broadcasting of medium wave broadcasting can be realized.
[0031] The present invention only uses frequency modulation of m≤0.2 on the 6.5KHZ signal, and the amplitude value after frequency modulation does not exceed 10%. Therefore, the entire sound and control frequency group signal do not exceed the indicators of the previous medium wave broadcasting transmitter, and the interference to other medium wave broadcasting stations will not increase.
[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A medium wave emergency broadcast transmission system capable of simultaneously sending voice signals and control signals, characterized in that: The system comprises: A signal sending module and a signal receiving module, wherein the signal sending module includes a coding compression unit, a frequency modulation unit, a signal mixing unit and a medium wave amplitude modulation transmitting unit; the signal receiving module includes two signal branches, namely a normal working path and an emergency working path; the normal working path includes: a high-frequency amplifier, a frequency converter, a broadband intermediate frequency signal amplifier, an intermediate frequency signal amplifier 1, a detector 1 and an audio amplifier; the emergency working path includes: a high-frequency amplifier, a frequency converter, a broadband intermediate frequency signal amplifier, a detector 2, a filtering amplification and shaping circuit, a frequency discriminator, a signal decompression unit, a micro control unit, a TF card reader and a power management controller.
2. According to claim 1, a medium wave emergency broadcast transmission system capable of simultaneously sending sound signals and control signals is characterized in that: The control signal of the emergency broadcast is sent out through the signal sending module; the control signal of the emergency broadcast is compressed by the coding compression unit to process the code of the disaster occurrence address output by the computer, and then sent to the FM unit with a carrier frequency of 6.5KHZ for FM processing, and then sent to the signal mixing unit to mix with the broadcast audio signal to generate a group signal, which is sent out through the medium wave amplitude modulation transmitting unit.
3. According to claim 2, a medium wave emergency broadcast transmission system capable of simultaneously sending sound signals and control signals is characterized in that: After the normal working path signal branch of the signal receiving module receives the medium wave broadcast signal of the medium wave broadcasting station through the antenna, it is sent to the speaker for sound generation through the high frequency amplifier, the frequency converter, the broadband medium frequency signal amplifier, the medium frequency signal amplifier 1, the detector 1, and the audio amplifier in sequence.
4. A medium wave emergency broadcast transmission system capable of simultaneously sending voice signals and control signals according to claim 2 or 3, characterized in that: The emergency working channel signal branch of the signal receiving module receives the control signal for starting the emergency broadcast sent by the medium wave radio station through the antenna, and sends it to the micro control unit in sequence through the high-frequency amplifier, frequency converter, broadband intermediate frequency signal amplifier, detector 2, filter amplification and shaping circuit, frequency discriminator, and signal decompression unit. After being compared with the TF card reader address code, if they are consistent, the micro control unit sends a power-on signal to the power management controller to start the audio information playback.