1. The concept of the common cable smart FM broadcast The term "shared cable smart FM broadcast", everyone must be very familiar with it, it is no longer a strange new word, but there is still no strict definition and specification. In view of schools, enterprises, factories, The tourist attractions and the friends of the engineering business are paying more and more attention to it, so they summarize the words of the public and break it down in detail.
"Common cable" refers to the use of FM frequency modulation technology to modulate the broadcast audio and control signals to 88MHz ~ 108 MHz (also modulated to 70MHz ~ 87 MHz) on the high frequency carrier, the modulated broadcast audio and control signals and Cable TV programs share CATV coaxial cable / photoelectric network transmission, that is, common cable. Broadcast audio, broadcast control and cable TV signals are transmitted in different frequency bands in CATV coaxial cable / photoelectric network, and no intermodulation phenomenon will occur.
"Intelligence" refers to making full use of computer technology and single-chip microcomputer control technology, so that broadcast programs, power management of broadcast peripherals, control of playback terminals, etc. can be automatically completed according to human programming settings to achieve broadcast and computer control technology. Perfect combination to achieve the purpose of unmanned automatic broadcasting.
"Frequency modulation" refers to the use of FM carrier to modulate the audio signal and control signal. Through the change of the carrier frequency of the analog audio signal and control signal, multiple (up to 60 channels) audio signals and control signals can be modulated with different frequencies And multiplexed onto a coaxial cable for simultaneous transmission, and does not interfere with each other's broadcast transmission mode.
In short, Haite Weiye common cable intelligent FM broadcast uses FM FM technology, computer technology, single-chip technology, etc. to transmit audio, control signals and cable TV signals together, which can achieve automatic program playback, automatic peripheral management, and automatic terminal control. The realization mode of modern campus broadcasting.
2. The composition of the common cable intelligent FM broadcasting Hiteweiye common cable intelligent FM broadcasting system is mainly composed of the control part, the transmission part and the receiving part.
Ø Control part: it is mainly composed of audio source (analog audio source from the digital audio source output by the playback host, radio head, microphone, etc.), audio matrix (audio signal switching device), frequency modulator (audio signal modulation device), and intelligent broadcast control host ( Control signal modulation equipment), mixer, etc.
Ø Transmission part: It is composed of a closed-circuit television coaxial network (mainly composed of coaxial cables, branch distributors, coaxial connectors and amplifiers) or a photoelectric hybrid network (common transmission of optical cables and coaxial cables).
ØReceiving part: There are two ways for Hite Weiye Total Cable Intelligent FM Radio, one is to listen directly with FM speaker, and the other is to receive and demodulate the audio signal with FM receiver and send it to the power amplifier to convert it into constant voltage Broadcast signals, listen with ceiling speakers, outdoor sound column, lawn speaker, etc.
3. Common cable intelligent FM broadcasting function Ø Maintain order: The system has the basic functions of traditional constant pressure campus broadcasting, such as: getting up, going out, attending class, ending class, turning off lights, etc., you can set the timing to automatically ring the bell according to the needs, maintain the teacher Student life order.
Ø Background music: After-school meals, Saturdays, Sundays, and other leisure time, you can broadcast news broadcasts, song blessings, light music, popular songs, etc., effectively alleviating the pressure of teachers, students, life, teaching and learning, creating an active and dynamic Campus time and space.
Ø Multi-channel broadcasting: Since the 88-108MHz frequency band in the coaxial cable is reserved for FM broadcasting, it can use a single cable to transmit up to dozens of sets of broadcast programs to meet the campus broadcast needs of independent broadcast of grades.
Ø Addressable broadcasting: The system has the addressable broadcasting function, which can automatically or manually control the reception status of each classroom and campus receiving terminal (FM speaker / FM receiver) through software. You can also arrange the receiving terminals randomly and play them automatically or manually through software control.
Ø Unified broadcasting: The system can perform unified collective broadcasting according to teaching needs, and all speakers play the same program, so that the school can perform collective broadcasting, school meetings, unified audio teaching, etc.
Ø Foreign language teaching: Recently, there is a strong demand for foreign language talents. The state will change the cultivation of students ’foreign language ability from written to written, and improve their listening skills. As a result, foreign language listening teaching, training, and examinations have become new tasks undertaken by campus broadcasters. Classes, class groupings, and requirements for all classes to broadcast in foreign languages.
Ø Broadcast gymnastics: The system can arrange the exercises such as eye exercises, radio gymnastics, march, sports songs, etc., and can be set to play automatically or manually according to the needs, which can meet the requirements of students to protect their eyesight, body, and hold sports meets.
Ø Emergency broadcasting: Schools are places for teaching and educating people, with a large population. The system has the function of emergency evacuation of any combination of classes for teachers and students in case of emergencies, so that the school can protect the safety of teachers and students to the greatest extent when it encounters emergencies.
Fourth, the characteristics of common cable intelligent FM broadcasting Ø Diversified programs: the system is compatible with DVD, MIDI, computers, radio heads, phonographs (more used in drama schools) and other program playback equipment to meet the current format of teaching audio playback.
ØAutomatic play: Supports playing tracks for scheduled play arrangement on a weekly basis. The system can automatically play tracks on time according to the arrangement program and automatically manage the state of the playing terminal.
Ø Management autonomy: The system organically integrates computer control technology, single-chip technology, software programming technology, etc. to fully realize the autonomy of playback, peripherals and terminal management, saving manpower and material resources.
Ø Co-cable transmission: adopts FM carrier to modulate the audio and control signals, and carries the audio and control signals on the high-frequency carrier, which can be transmitted on the same cable as the cable TV, greatly improving the utilization rate of transmission resources.
ØMultiple listening: The system supports multiple answering methods. You can listen directly with FM speakers, or you can demodulate the signal through the FM converter and then amplify the power with ceiling speakers, wall speakers, outdoor sound columns or modeling speakers.
Ø Random expansion: There are two requirements for the receiving terminal to play the track normally, one is to have the system power supply requirements, and the other is to have the signal reception field strength requirements. Therefore, the extension terminal does not need to re-lay cables or replace the power amplifier, and it can be arbitrarily connected from the coaxial network on the basis of meeting the field strength requirements.
Fifth, the practicality of the common cable intelligent FM broadcasting Hite Weiye common cable intelligent FM broadcasting system not only has many functions that are not available in traditional fixed-pressure broadcasting, but also meets the requirements of modern education and teaching, as well as the following practicality:
5.1 Arbitrary combination of classroom teaching: the receiving terminal can be combined at will according to the need, and the timing / manual broadcast.
5.2 Independent broadcasting in different grades: different grades can broadcast different teaching radio programs.
5.3 Background music to maintain order: automatically play ringtones such as school and class, and can also play background music.
5.4 Unified Broadcasting and Concentrated Meeting: You can centrally and uniformly hold school meetings, and you can also insert content at the sports meeting.
5.5 Convenient education and teaching management: not only complete the maintenance of teaching order, but also integrate foreign language teaching.
5.6 Compatible with multiple audio sources: FM, CD, tape, WAV and other audio formats can be played.
Six, the stability of the common cable intelligent FM broadcast FM broadcast as a broadcast transmission method, has been applied in China for decades, the technology has been quite mature, and now it is applied to campus broadcasting, its stability, There is no doubt about the reliability. Hitewell's total cable intelligent FM broadcasting is mainly reflected in the following two aspects:
Ø Audio signal modulation and demodulation: The audio signal modulator uses PLL phase-locked loop technology to lock the phase of the modulation frequency to avoid the occurrence of drift in the modulation frequency; the receiver uses a technology of crystal oscillation stabilization frequency to stabilize the reception frequency when needed Frequency, the receiving frequency is accurate, stable and reliable.
Ø Modulation and transmission of control signal: Modulate the control signal of the common cable intelligent FM broadcast on the SCA idle subcarrier of the audio frequency to ensure that it is not interfered with to the greatest extent, and stable and reliable transmission.
7. Economics of common cable intelligent FM broadcasting Hite Weiye common cable intelligent FM broadcasting system has effectively solved the many new demands of current education and teaching on campus broadcasting. On the basis of meeting its various functional requirements and practical requirements, In a certain angle, it also has the economy that other systems do not have.
7.1 Wiring angle: Intelligent broadcasting and closed circuit television, the two systems share the CATV network transmission, the two are combined into one transmission, saving the physical, human and financial resources of the two wiring.
7.2 Construction angle: building the broadcasting system in a place with a closed-circuit television network, without laying signal cables, can reduce at least two-thirds of the time and work difficulty; in schools without transmission networks, building the broadcasting system is also for the construction Cable TV has reserved space for resource transmission. In the future, the expansion of cable TV will eliminate the need to lay cables.
7.3 Management perspective: The system achieves autonomy in broadcasting, management, and control, which makes the system not to be responsible for specific people, and to play at a fixed point, which not only saves the human resources required for system operation, but also greatly improves the safety, punctuality, reliability.
7.4 Maintenance perspective: Intelligent broadcast and CCTV systems use the same network for common cable transmission, which is convenient for maintenance and saves nearly one-half of the cost and effort. It is very simple and practical.
7.5 Expansion angle: The system expands the terminal receiving equipment without replacing the power amplifier or re-laying the cable, and adding the terminal directly on the bus.
8. Applicability of common cable intelligent FM broadcasting When it comes to broadcasting, I often hear people say that constant pressure broadcasting is good, FM broadcasting is good, digital network broadcasting is good, and a black and white is directly assigned to a certain broadcast transmission method. A bad sex. Actually, otherwise, each broadcast transmission method has its own adaptability. They have no black and white, good or bad, but it depends on whether the appropriate broadcast transmission method is selected according to the specific environment.
The same is true for the common cable FM broadcasting system, which is not suitable for all occasions. In some environments where there is no CATV network, it is not suitable for wiring, and there is no need to implement intelligent addressing and playback, it is not suitable for use, and it may even cause unnecessary trouble to users or construction units. It is mainly suitable for the following environments or needs:
Ø With CATV network, schools are not easy to wire, but want to make intelligent transformation of campus broadcasting.
Ø Those who do not have a CATV network and want to build an intelligent, automated, and addressable intelligent broadcaster.
Ø I want to make each grade have its own independent program, and can be divided into groups, groups, and grade-level broadcasting.
Ø Require the construction of campus broadcasting, foreign language listening teaching, and grade examinations all in one.
Nine, the total cable smart FM broadcast overview This article tries to analyze from different levels, different angles, and different depths of the Hite Weiye common cable smart FM broadcast, hoping that it can be helpful for everyone to understand this technology, let us take a deep understanding of modern popular education Broadcasting technology is the starting point to jointly promote China's education modernization and informatization.
"Common cable" refers to the use of FM frequency modulation technology to modulate the broadcast audio and control signals to 88MHz ~ 108 MHz (also modulated to 70MHz ~ 87 MHz) on the high frequency carrier, the modulated broadcast audio and control signals and Cable TV programs share CATV coaxial cable / photoelectric network transmission, that is, common cable. Broadcast audio, broadcast control and cable TV signals are transmitted in different frequency bands in CATV coaxial cable / photoelectric network, and no intermodulation phenomenon will occur.
"Intelligence" refers to making full use of computer technology and single-chip microcomputer control technology, so that broadcast programs, power management of broadcast peripherals, control of playback terminals, etc. can be automatically completed according to human programming settings to achieve broadcast and computer control technology. Perfect combination to achieve the purpose of unmanned automatic broadcasting.
"Frequency modulation" refers to the use of FM carrier to modulate the audio signal and control signal. Through the change of the carrier frequency of the analog audio signal and control signal, multiple (up to 60 channels) audio signals and control signals can be modulated with different frequencies And multiplexed onto a coaxial cable for simultaneous transmission, and does not interfere with each other's broadcast transmission mode.
In short, Haite Weiye common cable intelligent FM broadcast uses FM FM technology, computer technology, single-chip technology, etc. to transmit audio, control signals and cable TV signals together, which can achieve automatic program playback, automatic peripheral management, and automatic terminal control. The realization mode of modern campus broadcasting.
2. The composition of the common cable intelligent FM broadcasting Hiteweiye common cable intelligent FM broadcasting system is mainly composed of the control part, the transmission part and the receiving part.
Ø Control part: it is mainly composed of audio source (analog audio source from the digital audio source output by the playback host, radio head, microphone, etc.), audio matrix (audio signal switching device), frequency modulator (audio signal modulation device), and intelligent broadcast control host ( Control signal modulation equipment), mixer, etc.
Ø Transmission part: It is composed of a closed-circuit television coaxial network (mainly composed of coaxial cables, branch distributors, coaxial connectors and amplifiers) or a photoelectric hybrid network (common transmission of optical cables and coaxial cables).
ØReceiving part: There are two ways for Hite Weiye Total Cable Intelligent FM Radio, one is to listen directly with FM speaker, and the other is to receive and demodulate the audio signal with FM receiver and send it to the power amplifier to convert it into constant voltage Broadcast signals, listen with ceiling speakers, outdoor sound column, lawn speaker, etc.
3. Common cable intelligent FM broadcasting function Ø Maintain order: The system has the basic functions of traditional constant pressure campus broadcasting, such as: getting up, going out, attending class, ending class, turning off lights, etc., you can set the timing to automatically ring the bell according to the needs, maintain the teacher Student life order.
Ø Background music: After-school meals, Saturdays, Sundays, and other leisure time, you can broadcast news broadcasts, song blessings, light music, popular songs, etc., effectively alleviating the pressure of teachers, students, life, teaching and learning, creating an active and dynamic Campus time and space.
Ø Multi-channel broadcasting: Since the 88-108MHz frequency band in the coaxial cable is reserved for FM broadcasting, it can use a single cable to transmit up to dozens of sets of broadcast programs to meet the campus broadcast needs of independent broadcast of grades.
Ø Addressable broadcasting: The system has the addressable broadcasting function, which can automatically or manually control the reception status of each classroom and campus receiving terminal (FM speaker / FM receiver) through software. You can also arrange the receiving terminals randomly and play them automatically or manually through software control.
Ø Unified broadcasting: The system can perform unified collective broadcasting according to teaching needs, and all speakers play the same program, so that the school can perform collective broadcasting, school meetings, unified audio teaching, etc.
Ø Foreign language teaching: Recently, there is a strong demand for foreign language talents. The state will change the cultivation of students ’foreign language ability from written to written, and improve their listening skills. As a result, foreign language listening teaching, training, and examinations have become new tasks undertaken by campus broadcasters. Classes, class groupings, and requirements for all classes to broadcast in foreign languages.
Ø Broadcast gymnastics: The system can arrange the exercises such as eye exercises, radio gymnastics, march, sports songs, etc., and can be set to play automatically or manually according to the needs, which can meet the requirements of students to protect their eyesight, body, and hold sports meets.
Ø Emergency broadcasting: Schools are places for teaching and educating people, with a large population. The system has the function of emergency evacuation of any combination of classes for teachers and students in case of emergencies, so that the school can protect the safety of teachers and students to the greatest extent when it encounters emergencies.
Fourth, the characteristics of common cable intelligent FM broadcasting Ø Diversified programs: the system is compatible with DVD, MIDI, computers, radio heads, phonographs (more used in drama schools) and other program playback equipment to meet the current format of teaching audio playback.
ØAutomatic play: Supports playing tracks for scheduled play arrangement on a weekly basis. The system can automatically play tracks on time according to the arrangement program and automatically manage the state of the playing terminal.
Ø Management autonomy: The system organically integrates computer control technology, single-chip technology, software programming technology, etc. to fully realize the autonomy of playback, peripherals and terminal management, saving manpower and material resources.
Ø Co-cable transmission: adopts FM carrier to modulate the audio and control signals, and carries the audio and control signals on the high-frequency carrier, which can be transmitted on the same cable as the cable TV, greatly improving the utilization rate of transmission resources.
ØMultiple listening: The system supports multiple answering methods. You can listen directly with FM speakers, or you can demodulate the signal through the FM converter and then amplify the power with ceiling speakers, wall speakers, outdoor sound columns or modeling speakers.
Ø Random expansion: There are two requirements for the receiving terminal to play the track normally, one is to have the system power supply requirements, and the other is to have the signal reception field strength requirements. Therefore, the extension terminal does not need to re-lay cables or replace the power amplifier, and it can be arbitrarily connected from the coaxial network on the basis of meeting the field strength requirements.
Fifth, the practicality of the common cable intelligent FM broadcasting Hite Weiye common cable intelligent FM broadcasting system not only has many functions that are not available in traditional fixed-pressure broadcasting, but also meets the requirements of modern education and teaching, as well as the following practicality:
5.1 Arbitrary combination of classroom teaching: the receiving terminal can be combined at will according to the need, and the timing / manual broadcast.
5.2 Independent broadcasting in different grades: different grades can broadcast different teaching radio programs.
5.3 Background music to maintain order: automatically play ringtones such as school and class, and can also play background music.
5.4 Unified Broadcasting and Concentrated Meeting: You can centrally and uniformly hold school meetings, and you can also insert content at the sports meeting.
5.5 Convenient education and teaching management: not only complete the maintenance of teaching order, but also integrate foreign language teaching.
5.6 Compatible with multiple audio sources: FM, CD, tape, WAV and other audio formats can be played.
Six, the stability of the common cable intelligent FM broadcast FM broadcast as a broadcast transmission method, has been applied in China for decades, the technology has been quite mature, and now it is applied to campus broadcasting, its stability, There is no doubt about the reliability. Hitewell's total cable intelligent FM broadcasting is mainly reflected in the following two aspects:
Ø Audio signal modulation and demodulation: The audio signal modulator uses PLL phase-locked loop technology to lock the phase of the modulation frequency to avoid the occurrence of drift in the modulation frequency; the receiver uses a technology of crystal oscillation stabilization frequency to stabilize the reception frequency when needed Frequency, the receiving frequency is accurate, stable and reliable.
Ø Modulation and transmission of control signal: Modulate the control signal of the common cable intelligent FM broadcast on the SCA idle subcarrier of the audio frequency to ensure that it is not interfered with to the greatest extent, and stable and reliable transmission.
7. Economics of common cable intelligent FM broadcasting Hite Weiye common cable intelligent FM broadcasting system has effectively solved the many new demands of current education and teaching on campus broadcasting. On the basis of meeting its various functional requirements and practical requirements, In a certain angle, it also has the economy that other systems do not have.
7.1 Wiring angle: Intelligent broadcasting and closed circuit television, the two systems share the CATV network transmission, the two are combined into one transmission, saving the physical, human and financial resources of the two wiring.
7.2 Construction angle: building the broadcasting system in a place with a closed-circuit television network, without laying signal cables, can reduce at least two-thirds of the time and work difficulty; in schools without transmission networks, building the broadcasting system is also for the construction Cable TV has reserved space for resource transmission. In the future, the expansion of cable TV will eliminate the need to lay cables.
7.3 Management perspective: The system achieves autonomy in broadcasting, management, and control, which makes the system not to be responsible for specific people, and to play at a fixed point, which not only saves the human resources required for system operation, but also greatly improves the safety, punctuality, reliability.
7.4 Maintenance perspective: Intelligent broadcast and CCTV systems use the same network for common cable transmission, which is convenient for maintenance and saves nearly one-half of the cost and effort. It is very simple and practical.
7.5 Expansion angle: The system expands the terminal receiving equipment without replacing the power amplifier or re-laying the cable, and adding the terminal directly on the bus.
8. Applicability of common cable intelligent FM broadcasting When it comes to broadcasting, I often hear people say that constant pressure broadcasting is good, FM broadcasting is good, digital network broadcasting is good, and a black and white is directly assigned to a certain broadcast transmission method. A bad sex. Actually, otherwise, each broadcast transmission method has its own adaptability. They have no black and white, good or bad, but it depends on whether the appropriate broadcast transmission method is selected according to the specific environment.
The same is true for the common cable FM broadcasting system, which is not suitable for all occasions. In some environments where there is no CATV network, it is not suitable for wiring, and there is no need to implement intelligent addressing and playback, it is not suitable for use, and it may even cause unnecessary trouble to users or construction units. It is mainly suitable for the following environments or needs:
Ø With CATV network, schools are not easy to wire, but want to make intelligent transformation of campus broadcasting.
Ø Those who do not have a CATV network and want to build an intelligent, automated, and addressable intelligent broadcaster.
Ø I want to make each grade have its own independent program, and can be divided into groups, groups, and grade-level broadcasting.
Ø Require the construction of campus broadcasting, foreign language listening teaching, and grade examinations all in one.
Nine, the total cable smart FM broadcast overview This article tries to analyze from different levels, different angles, and different depths of the Hite Weiye common cable smart FM broadcast, hoping that it can be helpful for everyone to understand this technology, let us take a deep understanding of modern popular education Broadcasting technology is the starting point to jointly promote China's education modernization and informatization.
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