Existing campus radio, which has several transmission, what advantages and disadvantages?
A: The existing the common campus radio transmission: audio cable constant pressure (fixed resistance) transmission, wireless FM transmission, wired FM transmission in three ways.
(1) the most common audio twisted pair transmission cable constant pressure: The advantage is terminal cheap, simple structure; drawback is that each classroom are required wiring system in strict accordance with the principle of power matching and impedance matching configuration, scalability, and can not stereo broadcasting, program capacity is small (only transfer a set of programs), can not be done simultaneously broadcast different content by grade.
(2) wireless FM transmission: The advantage is simple construction, no wiring, low cost, multi-channel broadcast at the same time; drawback is the need to take up space frequency resources, in principle, need to be approved by radio management departments frequency vulnerable to outside interference, reliability relatively poor.
③ Cable Coaxial the total cable FM transmission: cable FM frequency division multiplexing transmission mode works based on the cable TV coaxial cable, the advantage of multi-channel transmission (up to 60 sets), scalable terminal speaker, as long as the reception level can be, regardless of quantity, the power limit. Cable TV technology in China has experienced nearly 20 years of development history, has been fully mature, supporting product prices low, stable performance. The wired FM radio with closed-circuit control, CCTV total of cable transmission, no wiring, construction is simple, stereo playback, the number of transfer programs can be expanded at any time, and intelligent broadcasting addressable control functions; drawback is wired FM transmission is based on weak signal transmission, FM speaker need external 220V AC power, but each school classroom can provide a stable 220V AC power.
The several techniques, schools should be used in a wired FM transmission mode, the wired FM radio scalability X high performance and low cost, and with the closed-circuit dual control, campus multimedia "multi-play".
2, the campus radio in the future development in what direction? Campus multimedia, closed-circuit dual control, campus network organically integrated, so that multi-play?
A: With the acceleration of the process of education information and the comprehensive construction of the School Link project, the campus radio in the future will be "digital, networked, intelligent direction, and ultimately with the campus multimedia, campus network" multi-play ". Judging from the current campus information technology, most of the schools already have or under construction coaxial network-based interactive closed-circuit control system and the campus computer network system based on the the UTP digital LAN architecture. The former bandwidth of 1-1000MHz the latter bandwidth of 1-100MHz, apparently the former has a bandwidth advantage, and the With cab Modem technology matures, will be compatible with all of the features of the latter.
3, what is the smart radio on the market today there are several types of products?
A: intelligent broadcasting as a new thing, and now the industry and there is no strict definition of a unified, national and industry department in charge there is no uniform national standards and industry standards. I believe that the term "smart" should be defined as humane, automation. Smart radio can be defined as a set in accordance with the thinking of the people the way it works, and can auto-complete to its broadcasting task, and intelligent broadcasting should be based on the computer as the core set of multi-functional integrated system.
Smart radio available on the market the following forms:
Analog audio digital recording partition player + SCM + audio cable + constant pressure speakers. This form generally has Switcher, automatic partitioning, automatically play the recording chip music. Drawback is unable to carry out multi-channel pass
Input, audio chip audio sampling frequency is low, the sound quality is poor, track capacity, usually 15-60 minutes, audio programs monotonous, have to use recording deck, VCD and other analog sources.
Constant pressure (2) analog source (or single-channel digital audio) + PC computer + partition controller + audio cable + control code line + Speaker + control ** (Some manufacturers use an 8-core cable). In this way is actually several sets of constant pressure broadcasting stack can be achieved basically multiplex addressing the point, the AutoPlay feature. But its structure is too complex, large construction wiring, cable node too, poor reliability, and the cost is also more expensive, poor scalability and expansion in order to meet the principle of impedance matching and power matching.
③ cable transmission + addressable controller + control-yard line + addressing ** + FM speaker. This approach can achieve transmission cables, the addressable control still wiring. Structure (2) kinds of improvement, but the construction is complicated, too much equipment, higher cost. The advantage of the program and the terminal are subject to expansion, unrestricted.
The ④ digital multi-channel program source + multi-cable transmission + FM-SCA subcarrier the addressable control signal transmission + addressable intelligent FM Speaker. In this way not only do the sound stream of digitized (a dedicated industrial computer, six-way digital audio programs broadcast concurrently), intelligent management and broadcast automation, and do multiple sets of radio programs and CCTV address control signals " Link ", the school of the existing CCTV system without wiring, scalability, high reliability, easy to install, can be point-to-point addressable control.
4 star Comtech intelligent broadcasting of what kind, any model, the similarities and differences between smart radio with other manufacturers?
A: star Comtech is a professional commitment to research and development campus smart radio technology companies, the company's main campus smart radio products. Has been developed Startech card HX-2000 - HX-9000 eight series of 60 kinds of specifications campus smart radio products and software, compared with other manufacturers HX-5000 digitized Campus intelligent addressable broadcast system to achieve the "audio digitization, Play automation, intelligent management, a comprehensive four modernizations standard expansion liberalization ". And to achieve "zero construction simplify the design of the wiring, CCTV, the campus radio control signal" Link ". Unique software-only partition, three frequency addressable speakers, reliable SCA subcarrier encoding control mode are exclusive.
HX-5000 FM-SCA digitized addressing how the campus smart radio reliability, installation and commissioning of complex?
A: HX-5000 is based on mature cable TV coaxial cable a total of technical work, the use of cable television networks for transmission, it is very reliable. The band 88-108MHz, in cable TV 48.5MHz-870MHz middle, as long as the network to meet cable TV transmission to meet the HX-5000 intelligent radio signal transmission. System installation and construction is very simple, simplistic "zero wiring design, as long as the installation of a good center equipment, classroom addressable speakers fixed, pass on 220V AC power supply, 55 ± 5 dB signal input level can be a good tune, general school 3-7 days to complete the construction and installation.
HX-5000 digitized addressable campus intelligent broadcasting system the possibility of multi-grade broadcast at the same time, the possibility of partition, group control and addressing point control to achieve packet partition President speech?
A: HX-5000 Intelligent Broadcast number of select FM1500/FM2000 modulator according to the number of school grades, and may be increased or decreased as desired, so that each grade has a channel, simultaneous transmission of the same or different programs. Single point of control for the software-only sub-control can be free to multi-point control, group control, control of sub-grade, sub-regional control, enabling broadcast and principals speech of any group or individual.
HX-5000 digitized addressable the campus smart radio please playground spots and sub-control?
A: Yes, can achieve sub-control functions. FM3200/3210 playground spots controller manual insertion and automatic control functions. Automatically, by broadcasting the main control room addressable control, manual playground Local control, audio signal broadcast live deck, microphone audio signals for the Games and other group activities.
8 HX-5000 digitized campus intelligent addressable broadcast training and examination of foreign language listening, how to use?
A: HX-5000 is designed specifically for Listening Teaching and examination of campus radio products. HX-8000 multi-channel digital program source hard disk automatically broadcast daily timing, location automatically broadcast foreign language teaching content, completely abandoned the the Tape source of inaccuracies and sound quality decline caused by wear and tear. Can be at different levels at the same time foreign language listening training and examinations, all grades broadcast their own content, classroom speakers with professional vocal processing circuit, high-fidelity results, and is very suitable for foreign language teaching, so that each of your classrooms have become standard language lab.
HX-8000 digital multi-channel broadcast system host how many digital program source, can meet the needs of the day-to-day broadcasting? The possibility of entry and editing audio signal?
A: HX-8000 host computer with 40GB-80GB large capacity hard drive that can store tens of thousands of tracks, including my company to your the campus radio built-in material library content; campus liturgical song, national anthem, eye exercises, a variety of music ringtones , world music, folk music, school song, the ancient Chinese literature reading of (modern) appreciate more than 2,000 MP3 tracks, fully meet the daily broadcast. School to create their own according to their preferences and requirements to edit your audio program, adding to the song library.
10, our school is now closed-loop control, the principal assessment, the campus network system, each classroom has a lot of lines, the possibility of wiring, addressable intelligent broadcasting?
A: Yes, HX-5000 is based on the "zero-wiring cable the transmission concept design, full bus structure, the use of closed-circuit television coaxial total cable for signal transmission to achieve closed-circuit television, FM radio, addressing control signal" line pass "without re-wiring. Pure digital network broadcasting LAN, TCP / IP protocol work-based product development work is being stepped up, functional experiments have been done. New products to market, the user can choose network digital smart radio products, intelligent broadcasting campus in the campus network.
11, HX-5000 CCTV transmission cables will not cause interference on closed-circuit television?
A: No, the system in strict accordance with the technical standards of China's radio and television division band work. System operating at 88-108MHz TV VLF and VHF bands between Channel 5 and Channel 6 TV signal to each other will not cause interference.
12, our school some places still need to make the loudspeakers or fixed pressure frets, whether the device can access the HX-5000 campus radio system?
A: Yes, My company has FM3300 FM Multi-divergent machine can directly drive loudspeakers or constant pressure speaker, and addressable control functions.
13 area is too large, whether on campus outdoor wireless addressable intelligent broadcasting system reliability is what?
A; can my company HX-2000 multi-channel FM transmitter (optional SCA type), wireless addressable intelligent broadcasting. In terms of reliability, the company uses a unique SCA subcarrier data transmission technology addressing switch machine control, and only in the carrier signal, the the SCA subcarrier signal control instruction three conditions exist in order to open the speaker, and therefore have high reliability will not malfunction due to outside interference or misuse of power on the use of a single frequency audio signal coding control signal transmission at the same time, no need to apply control frequency. Wireless FM does not recommend the use in the mega-cities, due to radio frequency resources of these cities is very tense, unable to arrange the frequency.
14. What is FM-SCA subcarrier FM addressable broadcast, different from traditional FM radio?
A: FM FM stereo channel bandwidth of 200KHz, the main carrier audio only about half of the remaining part is idle, without this part called subcarrier (SCA). The FM-SCA FM broadcast address is the main carrier transmission audio broadcast signal, the use of a subcarrier (SCA) to transmit the encoded control data signal, so that a transmitter, a frequency to achieve the simultaneous transmission of the audio signal and the encoded signal, both frequency resource savings, but also improves the reliability of the system. FM-SCA can be addressed FM radio, computer RS-232 serial communications, software graphical interface control.
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