"One-line addressable campus broadcasting" technical question and answer (also known as: campus common cable addressable intelligent broadcasting technology question and answer) Stainless Steel Color Painting Kettle Color Painting Teakettle,Diy Painting Kettle ,Stainless Steel Whistling Kettle,Color Painting Whistling Kettle Kingho Housewares.Ltd , https://www.kinghokettle.com
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1. What is the development direction of campus broadcasting system construction? Can it achieve multi-network integration with multimedia, closed-circuit television and two-way control teaching?
A: With the rapid development of domestic multimedia technology, education and teaching puts forward new demands on the campus broadcasting system. The construction of campus broadcasting must meet the current needs of the two centers of "maintaining daily teaching order" and "English listening training and examination". Design, so that the campus broadcasting system is developing in the direction of "digitalization, intelligence, addressability, and openness". On the basis of traditional broadcasting, it is necessary to add functions such as scheduled automatic playback, different sections to play, point-to-point, grouping, unified addressing control playback, and intelligent control of playback terminal switches.
Beijing Haiteweiye "One Line Communication Addressable Campus Broadcasting" can modulate audio signals and control signals to high-frequency carriers, and can be transmitted with the cable TV signal "One Line Communication", which fully realizes the teaching with multimedia, closed circuit TV and two-way control. Multi-network integration.
2. What is "one-line addressable FM broadcast"?
Answer: "One-line communication" refers to the use of FM modulation technology to modulate the broadcast audio and control signals onto a high-frequency carrier of 88MHz to 108MHz. The modulated broadcast audio and control signals share CATV coaxial cable with cable TV programs / Photoelectric network transmission. Broadcast audio, control signals and cable TV signals are transmitted in CATV coaxial cable / photoelectric network using different frequency bands.
"Addressable" refers to making full use of computer technology and single-chip microcomputer control technology, so that broadcast program playback and playback terminal control, etc., can be automatically completed in accordance with the arrangement of people, to achieve the perfect combination of broadcast and computer control technology, to achieve unmanned Manage the purpose of automatic broadcasting. Can also realize manual point-to-point control, partition control and unified control and other real-time playback.
"Frequency modulation" refers to the use of FM carrier to modulate audio and control signals. Through the change of different analog audio signals and control signals of carrier frequency, multiple (up to more than 60 channels) audio signals and control signals can be modulated with different frequencies. Multiplexed onto a coaxial cable for transmission.
In short, Beijing Haite Weiye "One Line Addressable Campus Broadcast" uses FM frequency modulation technology, computer technology, single-chip technology, etc. to transmit audio, control signals and cable TV signals together, which can achieve automatic program playback and automatic peripherals. Management, terminal automatic control of modern campus broadcasting implementation mode.
3. What technology is the "One-Line Addressable Campus Broadcast" built on? What are the advantages and practicality compared with traditional fixed-pressure broadcasting?
Answer: Beijing Haite Weiye's "One Line Addressable Campus Broadcast" is designed based on advanced scientific technologies such as cable FM FM broadcast modulation and demodulation, SCA sub-channel, single-chip control, VC software programming, the latest application of the Internet of Things, etc. Powerful functions and features such as audio source, automatic playback, intelligent control, and open expansion are the best way to realize the addressable broadcasting system of modern campus construction, which has been verified by hundreds of schools across the country.
The "One-line Addressable Campus Broadcasting" of Beijing Haite Weiye System not only has many functions that traditional fixed-pressure broadcasting does not have, but also meets the characteristics of modern education and teaching requirements, and has the following practicality:
? Arbitrary combination of classroom teaching: the receiving terminal can be combined at will as needed, and it can be broadcast regularly or manually.
? Independent broadcasting of different grades: different grades can broadcast different teaching radio programs.
Background music maintains order: automatically plays ringtones such as classes, and can also play background music.
? Unified broadcast centralized meeting: You can centrally and uniformly hold school meetings, and you can also broadcast the content of the sports meeting.
? Convenient education and teaching management: not only complete the maintenance of teaching order, but also integrate foreign language teaching.
? Compatible with a variety of audio source playback: can play FM, CD, tape, WAV and other formats of audio.
4. What is the working principle of Beijing Haiteweiye "One Line Addressable Campus Broadcasting"?
Answer: Analog audio sources such as DVD and microphone broadcast analog audio, send it to the mixer for mixing, volume adjustment, audio modification and other output composite audio signals, and audio input audio matrix switcher such as digital tuner and intelligent broadcast control host The audio signal is switched, and then input to the FM modulator to modulate the FM high-frequency carrier signal, and then sent to the mixer to multiplex the frequency into the CATV coaxial network.
The intelligent broadcast control host sends an RS-232 control signal to the encoding controller to control the encoding and modulation, and then sends it to the mixer to perform the same frequency modulation with the audio.
The cable FM broadcast signal is transmitted in the CATV coaxial network in the form of RF. The terminal can play sound through the FM speaker, or use the FM power amplifier to demodulate the audio signal and play it through the fixed-pressure sound column after power amplification. The controller will demodulate the FM signal to the constant voltage power amplifier to play through the lawn speaker and constant pressure speaker.
5. What is the product model of Beijing Haiteweiye "One Line Addressable Campus Broadcast"? What is the quality? How about the price?
Answer: The model of Beijing Haite Weiye "One Line Addressable Campus Broadcasting" is EN6010. The quality of product production is strictly controlled, adhering to the survival philosophy of "leading technology, winning by quality, and focusing on service". With high-quality leading products and sincere and perfect services, it has not only won many users, but also received recognition from the entire industry. And the product has been used by hundreds of schools, and won unanimous praise from the school.
Compared with products of the same grade, our price has great advantages and high cost performance.
6. Can "One-line Addressable Campus Broadcasting" realize the simultaneous broadcasting of different programs in different grades? How to achieve?
Answer: Can be achieved. By configuring one FM modulator for each grade, programs of different grades are modulated to different FM FM frequencies, such as: first grade modulation to 88.6MHz, second grade modulation to 93.7 MHz, third grade modulation to 93 MHz, etc. Different frequencies transmit different programs, which can achieve different grades to broadcast different broadcast programs. By configuring an audio matrix switcher in front of the FM modulator, any input / output switching of audio programs can be realized, and a program can be played uniformly or different programs can be played in different grades.
7. Can "One-line Addressable Campus Broadcasting" realize the unattended broadcast of campus bells regularly? Can I specify a certain class or some speakers to play automatically at regular intervals? How to achieve?
Answer: Beijing HiteWeiye's "One-line Addressable Campus Broadcasting" system can set up automatic playlists of campus ringtones on a weekly basis. After the playlist is set, the system can automatically switch on and off the computer every day, and automatically play the campus ringtones unattended according to the arrangement, and can be automatically cycled in weekly units. And the system has the function of saving and recalling multiple sets of playlists in spring and autumn, which is very convenient to manage and easy to operate.
When the system is set to play regularly, you can arbitrarily specify the playback area of ​​the track to be played regularly, you can specify a speaker to achieve point-to-point addressing broadcast, you can specify a group of speakers to achieve point-to-group addressing broadcast, or you can perform unified broadcasts throughout the school.
8. In case of emergency, can I designate a speaker or a group of speakers to play through "One Line Addressable Campus Broadcasting"?
Answer: Beijing Haite Weiye's "One Line Addressable Campus Radio" has an instant broadcast function. When the school encounters emergency and instant broadcast speeches, announcements, files, etc., it can open any class, group or whole school receiving equipment through the software (FM Speakers, FM column, FM receiver and receiver, FM receiver controller) for instant playback. After the playback is completed, the system can automatically close all playback terminals.
The playback source can be audio, DVD, microphone, etc. in the computer, without any restrictions.
9. What control method is used for "One Line Addressable Campus Broadcast"? Do you want to lay control cables separately? What about stability and reliability?
Answer: Beijing Haite Weiye's "One Line Addressable Campus Broadcasting" uses the 67KHz (kilohertz) SCA sub-channel at the FM frequency modulation frequency to transmit the control signal to the receiving terminal.
Since the system modulates the control signal to the sub-channel transmission in the 88 MHz -108 MHz high-frequency carrier frequency band, it can be shared with the broadcast signal in the closed-circuit television network transmission, so there is no need to lay the control cable separately, thus eliminating the need for the control cable to lay the materials and Construction costs.
As a transmission method of broadcasting, FM broadcasting has been applied in China for decades. The technology is quite mature. Now it is used to apply to campus broadcasting. Its stability and reliability are beyond doubt. The stability of "One Line Addressable Campus Broadcast" is mainly reflected in the following two aspects:
? 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 of the modulation frequency; the receiver uses a technology of crystal oscillation to stabilize the frequency, which stabilizes the reception frequency when needed. Frequency, the receiving frequency is accurate, stable and reliable.
? Control signal modulation and transmission: 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, stable and reliable transmission.
10. How to use "One Line Addressable Campus Broadcast" for English listening training and exams?
Answer: Beijing Haite Weiye "One Line Addressable Campus Broadcast" can be set automatically or manually by the system software, point-to-point, point-to-multipoint, grouped or unified playback, and each grade can play different content, This fully meets the needs of current English listening training and examinations. According to the different needs of each English listening training and exam, the school can play the playback track in sections and set the playback area arbitrarily.
Beijing Haiteweiye's "One Line Addressable Campus Broadcasting" adopts a flexible addressing control mode, completely abandoning the defects that traditional constant pressure broadcasting can only be divided into zone management and cannot be controlled by each classroom speaker, which is in line with modern education and teaching. The new demands of English listening training and examinations have become the first choice for the construction of campus radio and foreign language listening examination training broadcasts.
11. Outdoor sound columns and ceiling speakers have been built in our school's playgrounds, sports grounds, and dormitories. Can it be connected to "One Line Addressable Campus Broadcast"?
Answer: It is fully possible to achieve access. We fully consider the situation that some broadcasting equipment has been installed and can be used normally when the school is constructing or renovating campus broadcasting. Beijing Haite Weiye has specially developed a "one-line addressable campus broadcasting" "The FM receiver controller" and "indoor FM receiver amplifier" connected to the original fixed-voltage broadcasting system to avoid inconvenience and waste caused by repeated system construction.
For access to playgrounds, sports fields and constant pressure broadcasting systems, the "FM receiving controller + constant voltage power amplifier + outdoor column" method can be used; for dormitory and constant pressure broadcasting systems, "indoor FM receiving amplifier + suction" can be used "Top / wall-mounted speakers".
12. On-site sports meets need to be broadcast on-site. The dormitory life teacher broadcasts the management separately. How to realize "One-line addressable campus broadcasting"?
Answer: The last question answered the connection between "One Line Addressable Campus Broadcasting" and the constant pressure broadcasting system, which is also the way to solve this problem.
Playgrounds and sports fields adopt the "FM receiver controller + constant voltage amplifier + outdoor column" method. Through the "FM receiver controller", the FM broadcast signal is demodulated into a standard audio signal, and the fixed voltage amplifier is amplified to pass through the outdoor column. Play. At the same time, the "FM receiving controller" converts the control signal into AC220V power control, which can automatically control the switch of the power supply of the constant voltage amplifier according to the playlist or manual control, and realize the unattended management of the playground and sports field broadcasting.
If a sports meeting or a collective event is held in a playground or sports field, the manual switch of the "FM receiver controller" can be used to force the power supply of the constant voltage power amplifier to perform on-site insertion and broadcast, and to achieve secondary broadcast control management.
Dormitories, canteens, office buildings, etc. can use the "indoor FM radio receiver + ceiling / wall-mounted speaker" method. Through the "indoor FM radio receiver", the FM broadcast signal is demodulated and expanded into a fixed-pressure broadcast, which is output to the ceiling / wall-mounted speaker Play. At the same time, according to the automatic / manual control signal, it can automatically switch the power supply of the power amplifier embedded in the "indoor FM receiver" to achieve intelligent control and management of the speaker.
The dormitory life teacher can press the emergency broadcast button of "Indoor FM Radio Amplifier" to force turn on the speakers under his jurisdiction and perform dormitory broadcast insertion to facilitate the management of students.
13. Will the "One Line Connect Addressable Campus Broadcasting" and cable TV system "One Line Connect" transmission interfere with each other? Why?
Answer: There will be no mutual interference (also called mutual interference). The transmission bandwidth of the coaxial cable is 1000MHz. The "one-line addressable campus broadcasting" transmission uses the 88 MHz-108MHz frequency band transmission, and the cable TV signal transmission uses the 47 MHz-87MHz and 110 MHz-862MHz frequency band transmission. Since the two systems use different frequency bands for transmission, they will not interfere with each other. Moreover, this is a national cable TV technical specification, not defined by any manufacturer.
14. What is the scalability of the "One Line Addressable Campus Broadcast"? What are the technical requirements for the expansion of receiving equipment? What device to add?
A: It is completely open for expansion, and it is easy to expand. Different from the expansion of fixed-voltage broadcasting, it is necessary to consider the power of the fixed-voltage power amplifier, or even to replace the fixed-voltage power amplifier to bring about repeated system construction and waste of funds. The indoor FM receiver amplifier or FM receiver controller is connected nearby on the transmission line, and the receiving level can be between 55dBuv-85dBuv, and the broadcasting equipment in the computer room does not need to be replaced at all.
15. Do you want to know the construction and maintenance costs of "One-line Addressable Campus Broadcasting" and the construction period?
Answer: Beijing Hitewell ’s “One Line Addressable Campus 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, it is based on From the angle of view, it also has the economy that other systems do not have.
? Wiring angle: Intelligent broadcasting and closed circuit television, the two systems share the CATV network transmission, the two are combined in one transmission, saving the material, manpower and financial resources of the two wiring.
Construction angle: constructing the broadcasting system in a place with a closed-circuit television network, without laying signal cables, can reduce the time and work difficulty by at least two-thirds; 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.
? Management perspective: The system has achieved autonomy in broadcasting, management, and control, which makes the system not to be responsible for specific personnel, and to play at a fixed point, which not only saves the human resources required for system operation, but also greatly improves the security, punctuality, and reliability.
? Maintenance perspective: Intelligent broadcast and closed-circuit television 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.