University Digital Network Broadcasting System Solution

1. Overview of university network broadcasting Traditional broadcasting generally adopts audio or frequency modulation. Audio broadcasting is affected by factors such as voltage, power, impedance, etc. The transmission distance is short, the frequency is low, it is easy to be interfered, and the system scalability is poor. FM broadcast introduces noise into the modulation and demodulation, aging equipment, frequency offset will also cause signal distortion. Controllable intelligent broadcasting based on audio and FM transmission is limited by the transmission method, and can only be controlled by partitioning and grouping. The lack of independent program sources has caused broadcast terminals to fail to meet personalized application requirements. Network broadcasting can be constructed based on the existing LAN / WAN network, without separate wiring during installation. Based on IP network program delivery, each broadcast point can have its own independent broadcast program, and can perform two-way call broadcasting to any broadcast point or all broadcast points. Its network broadcast terminal can order network audio server programs. This diversification The form of broadcasting provides the feasibility for the university to construct a university network broadcasting that meets the needs of modern education and teaching.
The network broadcasting of Hite University of Technology is based on the TCP / IP protocol and uses ADSL, LAN, WAN, INTERNET and other networks. The audio and control signals are all digitally encoded and processed without transmission space restrictions or transmission distance restrictions. Digital two-way network transmission system. The physical structure of the university network broadcasting system is fully integrated with the local area network, which provides convenience for sharing Internet resources, conforms to the development trend of network technology and remote access, and enriches the application of the expansion of the local area network and the wide area network. It is adapted to the development trend of the times. The most forward-looking, practical and scientific next-generation broadcasting system is the best solution for building a college campus broadcasting system.
The network broadcasting system of Hite University is fully integrated with the campus network in physical structure, which also provides convenience for sharing teaching resources on the Internet. The Internet radio of Hite University of Technology can broadcast digital courseware, and can broadcast online radio stations in real time in a digital way. Education departments at all levels can produce radio stations or courseware according to the excellent teacher resources concentrated in the region, and then realize real distance education through digital network broadcasting. The network broadcasting system of Hite University of Science and Technology has the functions of uniformly playing background music, leading online speech, automatic music ringing, remote auxiliary control management, arbitrary on-demand audio, etc., and distributed collection and editing functions, which is very in line with the development trend of networked technology and distance education , Enriched the application of using campus network resources, and provided a new idea of ​​"advancedness, economy, wide area, distribution, and interactivity" for the construction of campus broadcasting, which is a concrete manifestation of educational informatization in the practical application of teaching .
2. Design Ideas of University Network Broadcasting
2.1 The design basis of the university network broadcasting system The design of the university network broadcasting system strictly follows the relevant national standards and industry specifications. The main basis is as follows:
Ø "Measuring method of basic characteristics of mixer" GB9003
Ø "Electrical and Electronic Products Basic Environmental Testing Rules" GB2421 / 22 / 23.1 / 23.2
Ø "Safety requirements for household and similar general-purpose electronics and related equipment powered by grid power" GB8898-88
Ø "Teaching Communication Grounding Design Code" GBJ－79-85
Ø "Code for Industrial Enterprise Communication Design" GBJ42-81
Ø "Using building metal body for lightning protection and grounding device installation" 86SD566
Ø "Measurement method of hall sound reinforcement characteristics" GB4959
Ø "Calculation Method of Language Clarity Index" GB / T15485,
Ø "Measurement Method of Audio Amplifier" GB9001-88
Ø "Microphone Measurement Method" GB9401-88
Ø "Measurement Method of Tape Recorder" GB20181-85
Ø "Radio Related Parameters and Measurement Methods" GB4878-85
Ø "Measurement Methods of Microphone Performance" GB9396-88
Ø "Safety of Information Equipment and Safety of Electrical Equipment" GB4943-95
Ø "Electronic Equipment Lightning Strike Protection Law" GB7450-87
Ø "Electrical Equipment Safety" GB10292-88
Ø "Public broadcasting project cost budget preparation method"
2.2 Design Principles of University Network Broadcasting The design of university network broadcasting follows the principle of "advanced and applicable, economical and practical, safe and reliable, mature and stable, powerful, and cost-effective". It also considers important factors such as construction and maintenance, while also leaving room for future development, expansion, and transformation. The design content of this system is systematic, complete and comprehensive, and the design scheme is scientific, reasonable and practical.
2.2.1 The technical performance and quality indicators of the advanced and applicable system of university network broadcasting should reach the international advanced level; at the same time, the installation and debugging of the system, software programming and operation should be simple and easy to master, suitable for China's national conditions and cost. Features of the project. The system integrates many advanced technologies in the world, embodies the latest development level of current computer control technology and computer network technology, and adapts to the requirements of the development of the times. At the same time, the system is a system for various management levels. Its function configuration is based on the principle of providing users with comfort, safety, convenience, and speed, and its operation should be simple and easy to learn.
2.2.2 Economics and Practicability of University Network Broadcasting Beijing Haiteweiye fully considers the actual needs of users and the development trend of information technology, and designs and selects functions and system configuration schemes that are suitable for site conditions and meet user requirements according to the user's site environment. Organic combination, to achieve the best performance-price ratio, in order to save engineering investment, and at the same time to ensure the needs of the implementation of system functions, economical and practical.
2.2.3 The reliability and security system design of university network broadcasting should have high reliability. After the system failure or accident causes interruption, it can ensure the accuracy, completeness and consistency of the data and have the function of rapid recovery . At the same time, the system has a complete set of anti-virus and anti-hacking strategies to ensure that the system operates safely in an open environment.
2.2.4 The maturity and openness of university network broadcasting are designed with the existing mature products as the object, and at the same time, considering the current status of the surrounding information communication environment and the development trend of technology, audio and video, graphic information transmission channels are reserved, with RJ -45 network communication port, which can expand the transmission of LED safety text information and broadcast picture information in scenic spots.
2.2.5 University network broadcast expansion and scalability The system design takes into account the future development and use of technology, and has the possibility of updating, expanding and upgrading. And expand the system functions according to the actual requirements of the project in the future, and at the same time, the plan has redundancy in the design to meet the future development requirements.
2.2.6 University network broadcasting pursues the most optimized system equipment configuration Under the premise of satisfying the user's requirements for functions, quality, performance, price and service, the pursuit of the most optimized system equipment configuration to minimize system cost
2.2.7 University network broadcasting reserves sufficient expansion capacity. The control capacity of the engineering equipment is reserved to allow for the transformation of new control points in the system; the system also retains interfaces to other computers or automation systems; also try to consider Future scientific development and application of new technologies.
Third, the selection principle of university network broadcasting
3.1 The scientificity, accuracy and advancedness of the design of the university network broadcasting system:
When designing the university network broadcasting system, ensure that the acoustic technical indicators of teaching, dormitory, corridor and outdoor venues meet the requirements of relevant national documents, so that the sound system design of each venue is scientific, accurate and advanced.
3.2 Systematic and practicality of university network broadcasting to meet the functional requirements:
In the configuration of the university network broadcasting system, we ensure that the system should have the ability and level to complete the functions required by the project, meet the actual needs of the project and the requirements of relevant domestic standards, and be easy to implement and easy to operate.
The equipment used in the university network broadcasting system is the advanced products of well-known foreign and domestic manufacturers. The equipment meets the requirements, and has consistency and interchangeability, so that the system has good flexibility, compatibility, scalability and portability.
3.3 Reliability and service guarantee of university network broadcasting equipment:
The main equipments in the network broadcasting system of our design university are all famous brand products. HYTEWAY professional products have been successfully applied in various parts of the country with high reliability and excellent performance. At the same time, HYTEWAY professional products are committed to All users enjoy a one-year free warranty, and have established a comprehensive technical service network throughout the country to provide customers with timely and effective services.
3.4 Economics of university network broadcasting system configuration:
We always follow the principle that the performance and price ratio of the equipment selected by the university network broadcasting system reaches the best, to ensure that the configuration of the campus digital network broadcasting system is highly economical and practical.
Fourth, the principle of the university's network broadcasting system The network broadcasting system of Beijing Haite Albert University uses a fully digital audio processing scheme. The transmission system is based on Ethernet and cooperates with TCP / IP protocol to ensure that the system has good stability and scalability. The system uses a fully digital processing method to realize the lossless transmission of data, so that the problems of distortion and noise during the transmission process have been completely resolved. With the rapid development of the network today, the transmission distance of the network broadcasting system of Beijing Haite Albert University can add network sub-control and network broadcasting terminals very flexibly, and it has a very broad expansion.
V. Design of University Network Broadcasting Scheme The network broadcasting system of Beijing Haite Albert University is mainly composed of three parts: control part, transmission part and receiving part.
5.1 The broadcast control part of university network broadcasting:
The DVD / VCD, deck, digital tuner, broadcast microphone, and network audio server form the headquarters' multiple broadcast program sources. The broadcast digital programs are transmitted to the existing or under construction TCP / IP (including LAN, WAN, INTERNET) network to Classrooms, dormitories, canteens or outdoor places, etc. DVD / VCD, decks and digital tuners can be set by the system timer to set the timer switch to play. The network audio server has an automatic play engine, which can automatically point and set the playlist according to the preset time. Group or unified broadcast programs for classrooms, dormitories, canteens or outdoor places. The broadcasting room can perform paging broadcasting to any classroom, dormitory, canteen or outdoor place. The network audio server can receive any on-demand broadcast of any classroom, dormitory, canteen or outdoor place, and provide storage audio playback. The network audio server can automatically manage the switching of broadcast equipment in any classroom, dormitory, canteen or outdoor place through a regular playback engine.
The principal's office, academic affairs department, logistics department, security room, and other teaching management institutions can implement remote sub-control terminals through network broadcasting, or install network auxiliary control software in the computer to realize the auxiliary control management of university network broadcasting.
Since the university network broadcasting system is based on the TCP / IP architecture, audio collection, playback management, and remote calling can all be realized by network distribution, without geographical restrictions.
5.2 The part of university network broadcast transmission:
The campus LAN, WAN or INTERNET network is used to connect the broadcasting room, the sub-controller and the receiving terminal. Audio signals and control signals are transmitted in a bidirectional manner in a digital format through the TCP / IP protocol in the network. The transmission requirement of the current university network broadcasting system is 128Kbps. The construction of the campus network in China basically meets the requirements of the 10M / 100M network. It can fully meet the transmission rate requirements of university network broadcasting, and can ensure the reliability and stability of the broadcast signal and the clear voice signal.
5.3 University network broadcast receiving part:
There are three ways to receive digital network broadcasts on Hite Albert campus. One is to listen directly with network speakers, and the other is to use network broadcast terminals to receive and demodulate the audio signal and send it to a given resistance speaker to listen to. It can also be accessed through the network (on demand) The preamplifier receives and demodulates it, and then sends it to the pure post-stage power amplifier to convert it into a constant-pressure broadcast signal, and listen to it with a ceiling speaker, outdoor sound column, lawn speaker, etc.
6. Features of university network broadcasting
6.1 University Network Broadcasting Functions The main functions of university network broadcasting are: personalized regular broadcast, classroom interactive on-demand, online radio broadcast, leading online speech, real-time voice broadcast, automatic music ringing, courseware resource conversion, classroom audio amplification.
6.1.1 Personalized Timed Broadcasting Because each network voice terminal of the university network broadcast has an independent IP address, it can individually receive the server's personalized scheduled broadcasting program. The operation of the scheduled broadcast can be set online by the teacher through the computer or directly in the classroom through the wireless broadcast control mobile phone.
6.1.2 Classroom interactive on-demand The real-time on-demand function of the university network broadcast can enable teachers to communicate with the server in the classroom in real time to achieve interactive teaching. The wireless intelligent broadcast control mobile phone provides a personalized Chinese LCD display operation menu interface to assist teachers in performing flexible control operations.
6.1.3 Internet radio broadcasting University Internet radio can convert Internet network radio programs received through Internet radio software into HYTEWAY broadcast data format, which can be played in real time to network voice terminals. Such as Voice of America, BBC, CNN and other specialized language teaching stations in China.
6.1.4 Leaders 'online speech University webcasts can realize leaders' online speech. The leader does not need to go to the broadcast center, through any computer connected to the system server, he can realize remote speech through the computer's microphone. You can speak to the whole school or to some areas.
6.1.5 Real-time voice broadcast and broadcast The real-time broadcast and broadcast function of university network broadcast programs can collect and compress and store programs from other audio sources to the server in real time, and can also broadcast to designated classroom terminals at the same time as required. The broadcast source can be other commercial or personal radio stations, recorder decks, CD players, MP3 players, microphones, etc. Used for listening tests and broadcast announcements.
6.1.6 Automatic music ringing The university network radio can set personalized music ring tones and automatically play the ring tones after class according to the scheduled work schedule. The schedule of work and rest can be automatically adjusted according to spring and autumn, and provides special configuration options for sunny and rainy days and holidays.
6.1.7 Courseware resource conversion University network broadcasting powerful courseware production software, can convert the school's original various formats of audio source courseware into data files, teachers can also listen to the sound while adding lessons while adding intelligent menu labels To facilitate quick positioning and segmented teaching during class.
6.1.8 Classroom audio amplification The voice terminal of the university network broadcast provides audio access function. When there is no broadcast signal, the audio output of the teaching computer can be connected to the voice terminal and broadcast through the amplified sound. Teachers can wear a wireless lavalier microphone during class, and the voice of the speech can be connected to the voice terminal and broadcast. The voice terminal can automatically switch the power supply of the power amplifier speaker according to the presence or absence of the voice signal.
6.2 Characteristics of university network broadcasting 6.2.1 Digital transmission: University network broadcasting adopts a unique CD-quality data file format. Through TCP / IP protocol, the broadcast microphone, deck, radio head, audio network server and sub-control host audio are digital The format is transmitted to each network broadcast receiving terminal. This full digital transmission method avoids the attenuation of audio signals and the addition of noise, ensuring high-fidelity audio playback.
6.2.2 Terminal personalization: University network broadcasting is based on WAN, LAN or INTERNET. Each network broadcasting terminal can have a unique independent IP address in its own network. It can play different music at the same time, and the maximum number of programs can be played. Up to 255, fully meet the needs of university network broadcasting.
6.2.3 Front-end network: The university network broadcast extends the front-end audio source to the entire network, and the scheduled broadcast of programs can be operated remotely through the network. Networked management can also set different permissions for different users.
6.2.4 Play automation: The university network broadcast can realize automatic play, and specify the play time for each program, the server will automatically play, and the play content and target range can be arbitrarily specified.
6.2.5 User-friendly operation: University Webcast provides a user-friendly graphical menu interface and user-friendly operation, which is easy and convenient, specific and practical, and improves the efficiency of use.
6.2.6 Application intelligence: University network broadcasting has many intelligent designs, which can realize voice functions such as recording, variable speed, and list loop playback during the broadcast process; it can also achieve timing settings and automatic broadcast playback; and can be remotely scheduled and maintained , Management, etc.
6.2.7 Simplify the project: The university network broadcasting project is simple. For each IP broadcast point with a local area network, you only need to add the network broadcast adapter to install. If you do not build a network, the amount of data network engineering is relatively simple, only Just lay the network cable. Once constructed, the broadcasting system and the computer network system can be shared to reduce the repeated construction of multiple networks.
6.2.8 System zero maintenance: The university network broadcast is physically shared with the network, so no additional maintenance work is added to the network maintenance. In terms of application, the system can be set up to separate the network segment from the computer system, and the embedded system program of each network broadcast adapter is solidified and will not be infected by viruses. The system is stable and reliable, and there is basically no maintenance work.
7. Introduction of the main equipment of university network broadcasting
7.1 Network broadcasting software Network broadcasting software features Ø Digital network broadcasting system core (control part software);
Ø Take TCP / IP as the transmission protocol, suitable for all LANs and WANs;
Ø Remote monitoring and remote diagnosis broadcast terminal;
Ø Built-in mass music library, suitable for various user needs;
Ø Built-in audio collection and compilation software for users to make their own program source
Ø The software has a built-in fire alarm function, which can realize N ± 4 adjacent area alarm;
Ø Remote software upgrade;
Ø Audio collection for users to edit and record program source (collection software)
Ø Program arrangement, sequential play (programming software)
Ø Leadership speech priority (sub-control software)
7.2 Network speakers Technical parameters of network speakers:
Ø Frequency response: 20-20k
Ø Power amplifier output power: 15W × 2 (THD = 10%) RMS
Ø Signal to noise ratio of power amplifier: not less than 75dB
Ø Long-term maximum audio input voltage: ≤1.1V
Ø Long-term standby power consumption: less than 0.3W
Ø Audio input method: 100M Rj45 network port Ø Audio file transmission bit rate: 8Kbps-320Kbps adaptive Ø Power supply voltage: ~ 220V (± 10%) 50Hz
Ø Woofer: anti-magnetic, 4 inch composite paper cone Ø Tweeter: anti-magnetic, 1 inch PV film dome Ø Main and auxiliary box size: 140 (width) × 260 (height) × 188 (depth) mm
Ø Packing size: 341 (length) × 235 (width) × 297 (height) mm
Ø Color: Walnut Wood Weight: Total weight about 6Kg
7.3 Network Broadcast Terminal Function Features of Network Broadcast Terminal Ø Installation: Wall Mount Ø Speaker Type: Active Speaker Ø Application Environment: Indoor Broadcasting Point, No Interactive On-demand Requirements Ø Environmental Examples: Pantry, Lounge, Toilet, Aisle Network Broadcasting Terminal Technology Parameters Network broadcast terminal technology network part Ø Network port rate: 10 / 100M self-adaptation Ø Configuration interface: R232 serial port Ø Power-off restart recovery time: less than 1 second Ø Power-off restart recovery time: less than 1 second Ø Main protocols: TCP, UDP 3. Multicast Ø Network delay:
Ø File playback: less than 50ms
Ø Real-time speech: less than 150ms
Technical interface part of network broadcast terminal Ø Rj45 network port: one Ø R232 configuration serial port: one Ø 220V power input interface: one Ø 220V power output interface: one Ø audio output interface: 1 network broadcast terminal audio part Ø Sampling rate: 44.1KHz
Ø Harmonic distortion: less than one thousandth Ø Audio bit rate: 8Kbps-320Kbps adaptive Ø Audio mode: two-channel stereo Ø Volume adjustment: 32-level digital volume Ø Frequency response: 20Hz-20KHz
Ø Signal to noise ratio: greater than 90dB
Other parts of network broadcast terminal Ø Power input: ~ 220V (± 10%)
Ø Power output: ~ 220V (± 10%)
Ø Output power: 50W Standby power consumption: less than 0.3W
7.4 Network broadcast on-demand terminal Network broadcast on-demand terminal function description:
Ø Built-in power amplifier, switch module, on-demand module;
Ø 192 * 64 dot matrix five-inch LCD liquid crystal display with backlight;
Ø Chinese menu interface, human-machine dialogue;
Ø Support infrared reception, remote program on demand;
Ø Support emergency backup interface of constant pressure broadcasting system, automatic switching;
Ø Hardware chip audio decoding, stable and reliable sound quality;
Ø Support local microphone and line audio access;
Ø Remote priority function, automatic forced insertion;
Ø Volume control, high and low sound adjustment.
Network parameters of the network broadcast on-demand terminal:
Ø Network port rate: 10 / 100M self-adaptation Ø Configuration interface: R232 serial port Ø Power-off restart recovery time: less than 1 second Ø Power-off restart recovery time: less than 1 second Ø Main protocols: TCP, UDP, multicast Ø Network delay :
Ø File playback: less than 50ms
Ø Real-time speech: less than 150ms
Number of interfaces:
Ø Rj45 network ports: three Ø R232 configuration serial ports: one Ø 220V power input interface: one Ø audio output interface: one Ø local audio input interface: one Ø emergency constant pressure broadcast backup interface: one Ø network broadcast on-demand terminal application features:
Ø Installation method: wall-mounted Ø Speaker type: fixed-resistance speaker Ø Application environment: indoor broadcasting point, with interactive on-demand demand Ø Environmental example: classroom, office, and workshop network broadcast on-demand terminal energy consumption parameters Ø Power input: ~ 220V (± 10 %)
Ø Rated power of power amplifier: 20W
Ø Standby power consumption: less than 0.3W
7.5 Network broadcast preamplifier Function description of network broadcast preamplifier Ø 19-inch standard rack type, 2U height;
Ø Automatically control the power supply of external power amplifier equipment;
Ø Provide automatic / manual forced power switch button;
Ø Three-level priority function, automatic forced insertion;
Ø Built-in network switch module;
Ø Built-in pre-power amplifier;
Ø Hardware audio decoding;
Ø Volume control, high and low bass adjustment Network radio preamplifier application characteristics Ø Back-end equipment: pure post-stage power amplifier Ø Application environment: large indoor broadcast point or outdoor broadcast point, no interactive on-demand demand Ø Environmental examples: gymnasium, activity center, Network parameters of network broadcast preamplifiers such as sports fields Ø Network port rate: 10 / 100M adaptive Ø Configuration interface: R232 serial port Ø Power-off restart recovery time: less than 1 second Ø Power-off restart recovery time: less than 1 second Ø Main protocol: TCP , UDP, multicast Ø Network delay:
File playback: less than 50ms
Real-time speech: less than 150ms
Number of network broadcast preamplifier interfaces Ø Rj45 network ports: three Ø R232 configuration serial ports: one Ø 220V power input interface: one Ø audio output interface: two pairs Ø local microphone input interface: three channels Ø local line input interface: three channels Ø Controlled power output interface: two-way network broadcast preamplifier audio parameters Ø Sampling rate: 44.1KHz
Ø Harmonic distortion: less than one thousandth Ø Audio bit rate: 8Kbps-320Kbps adaptive Ø Audio mode: two-channel stereo Ø Volume adjustment: 32-level digital volume Ø Frequency response: 20Hz-20KHz
Ø Signal to noise ratio: greater than 90dB
Ø Input sensitivity (line, network): －8dB
Ø Microphone input sensitivity: -39dB
Ø Output sensitivity: 0dB ± 1dB
Network broadcast preamplifier energy consumption parameters:
Ø Power input: ~ 220V (± 10%)
Ø Rated power: 30W
Ø Standby power consumption: less than 0.3W
Ø Maximum output power of controlled power supply: 1200W
7.6 Network on-demand preamplifier Features of network on-demand preamplifier:
Ø 19 inch standard rack type, 2U height;
Ø 192 * 64 dot matrix LCD screen with backlight;
Ø Chinese menu interface, human-machine dialogue;
Ø Support infrared reception, remote program on demand;
Ø Automatically control the power supply of external power amplifier equipment;
Ø Provide automatic / manual forced power switch button;
Ø Three-level priority function, automatic forced insertion;
Ø Built-in network switch module;
Ø Built-in pre-power amplifier;
Ø Hardware audio decoding;
Ø Volume control, high and low bass adjustment Network on-demand preamplifier Technical parameters Network on-demand preamplifier application part Ø Back-end equipment: pure post-stage power amplifier Ø Application environment: large indoor broadcasting point or outdoor wide Ø Broadcasting point, interactive demand on demand Ø Environment example: network parts of network on-demand preamplifiers such as gymnasiums, activity centers, sports fields, etc. Ø Network port rate: 10 / 100M adaptive Ø Configuration interface: R232 serial port Ø Power-off restart recovery time: less than 1 second Ø Power-off restart recovery time : Less than 1 second Ø Main protocols: TCP, UDP, multicast Ø Network delay:
Ø File playback: less than 50ms
Ø Real-time speech: less than 150ms
Network on-demand preamplifier interface part Ø RJ45 network ports: three Ø RS232 configuration serial ports: one Ø 220V power input interface: one Ø audio output interface: two pairs Ø local microphone input interface: two channels Ø local line input interface: one channel Ø Controlled power output interface: two-way network on-demand preamplifier audio part Ø Sampling rate: 44.1KHz
Ø Harmonic distortion: less than one thousandth Ø Audio bit rate: 8Kbps-320Kbps adaptive Ø Audio mode: two-channel stereo Ø Volume adjustment: 32-level digital volume Ø Frequency response: 20Hz-20KHz
Ø Signal to noise ratio: greater than 90dB
Ø Input sensitivity (line, network): －8dB
Ø Microphone input sensitivity: -39dB
Ø Output sensitivity: 0dB ± 1dB
General part of network on-demand preamplifier Ø Power input: AC220V (± 10%)
Ø Rated power: 30W
Ø Standby power consumption: less than 0.3W
Ø Maximum output power of controlled power supply: 1200W
7.7 Network broadcast remote sub-control terminal Function description of network broadcast remote sub-control terminal Ø Five-inch LCD liquid crystal display, humanized man-machine operation interface.
Ø Broadcast call function: the computer can call single or multiple terminals, partitions, and all areas.
Ø On-demand server audio files Ø Two-way intercom function: Two-way intercom between IP terminal and IP terminal, computer and IP terminal.
Ø Equipped with numeric keys, the operation is simple and fast.
Ø One-click help function, quickly connect to the control center, simple and fast operation.
Ø Built-in on-demand acquisition module to achieve real-time signal acquisition function.
Ø Support infrared remote control receiving, the remote control can be used to order programs at will.
Ø Built-in high-point pickup microphone, strong anti-noise characteristics.
Ø Built-in full-band monitor speakers, the sound is clear and loud.
Ø Audio auxiliary output, external expansion power amplifier.
Ø Support local microphone, line input, volume adjustment.
Ø Built-in three-level signal priority function A. Local signal priority: local input signal priority, and the priority level can be preset, network music plays the role of background sound.
B. Emergency broadcast priority: When emergency broadcast priority is input, the broadcast signal will automatically turn off the local input signal and play the network emergency broadcast signal.
C. Local signal mandatory priority: In case of emergency broadcasting, the local mandatory priority function can be activated to realize the manual local emergency broadcasting function.
Network parameters of remote remote control terminal for network broadcast Ø Network port rate: 10 / 100M self-adaptive Ø Configuration interface: R232 serial port Ø Power-off restart recovery time: less than 1 second Ø Power-off restart recovery time: less than 1 second Ø Main protocols: TCP, UDP, multicast Ø Network delay:
File playback: less than 50ms
Real-time speech: less than 150ms
Number of interfaces: Rj45 network port Ø 220V power input interface: one Ø audio output interface: two pairs Ø local microphone input interface: two channels Ø local line input interface: one channel Ø audio format: MP3 / MP2
Audio parameters of remote control terminal for network broadcasting Ø Sampling rate: 44.1KHz
Ø Harmonic distortion: less than one thousandth Ø Audio bit rate: 8Kbps-320Kbps adaptive Ø Audio mode: two-channel stereo Ø Volume adjustment: 32-level digital volume Ø Frequency response: 20Hz-20KHz
Ø Signal to noise ratio: greater than 90dB
Ø Input sensitivity (line, network): －8dB
Ø Microphone input sensitivity: -39dB
Ø Output sensitivity: 0dB ± 1dB
Energy consumption parameters of remote control terminal for network broadcasting:
Ø Power input: ~ 220V (± 10%)
Ø Rated power: 20W
Ø Standby power consumption: less than 0.3W
7.8 Ceiling speaker Ø RATES INPUT: 3W, 6W
Ø LINE VOLTAGE: 70 / 100V
Ø SENSITIVITY (1M, 1W): 90dB
Ø FREQUENCY RESPONSE: 100-13KHz
Ø DIMENSIONS (MM): Φ210X100MM
Ø HOLEFOR MOUNTING: Φ190MM
7.9 Outdoor column
7.10 Mixer The mixer has 8 channel inputs, 4MIC, 4 mono line inputs, 4 buses (stereo and grouped), low noise high precision microphone amplifier, phantom power, 3 band channel equalizer, 2 auxiliary send and 1 Stereo assisted return, built-in digital effects.
Technical index:
Mono input Ø Microphone input: electronically balanced, independent input configuration Ø Distortion and noise: 0.005% at + 4dBu, 1kHz
Ø Signal to noise ratio: 115dB
Ø Frequency response: 10Hz-55kHz, + 0 / -3dB
Ø Distortion and noise: 0.005% at + 4dBu, 1kHz
Stereo channel input Ø Linear input: unbalanced Ø Frequency response: 10Hz-55kHz, + 0 / -3dB
Ø Distortion and noise: 0.005% at + 4dBu, 1kHz
Impedance?
Ø Microphone input: 1.4kΩ
Ø Channel insertion backward feed: 2.5kΩ
Ø All other inputs: 10kΩ or greater Ø Tape output: 1KΩ
Ø All other outputs: 120Ω
Ø Dimensions: 245 (W) * 268 (D) * 24/73 (H) mm
Ø Weight: 2.4kg (5.29ib)
Ø Power supply: AC100V-120V, 60Hz / AC220V-240V, 50Hz
Ø Power consumption: 18W
7.11 TU313 digital tuner Features of digital tuner:
Ø Original luxury fluorescent dynamic display, full-featured microcomputer control system.
Ø Manual / automatic / radio frequency direct selection and many other tuning channel selection methods, easy to operate.
Ø Unique channel browsing and playback function, 60 radio frequency storage, life-long memory, never lost.
Ø Twenty-four hour clock display, scheduled on / off, scheduled alarm four times, super intelligent housekeeper function.
Ø Dynamic color level spectrum display, ten fantasy spectrum display mode selection.
Ø Leisurely infrared long-distance full-function remote control Ø Color box size: 475x295x100mm
Ø Net weight: 1.8kg
8. After-sales service of university network broadcasting Ø Principles of after-sales service: timely, fast and thoughtful Ø Qualification of after-sales service personnel: All engineering and technical personnel have undergone two months of professional training. Equipment installation and maintenance are all operated and implemented by professionals.
Ø Installation and commissioning: After the equipment is shipped to the location specified by the user, the company sends professional engineering and technical personnel to the user's site to install and debug the equipment.
Ø Technical training: send professional engineering and technical personnel to the user to conduct technical training on equipment use and daily maintenance.
Ø Accessories guarantee: The company has a special spare parts warehouse, and all spare parts are provided by the factory. If the equipment fails during use, our company can provide spare equipment.
Ø Warranty time: All equipments are provided with one year warranty service. During this period, all spare parts are provided by the company free of charge. After the warranty period expires, the company will carry out lifetime maintenance on the equipment. The cost of spare parts is charged.
Ø Specific implementation: The after-sales engineering department has built user files, and set up dedicated personnel to regularly (once every three months) telephone return visits to old customers to understand the equipment usage status and record them. Set up a dedicated phone to answer users for repair at any time. After receiving the repair report every time, immediately fill out the maintenance notice and submit it to the responsible engineer, and accurately describe the equipment failure to the engineer. The engineer signs the notice and is responsible for maintenance. All repair calls will be answered by professional engineering staff by telephone or engineers will be dispatched to the site for maintenance.
9. Introduction of University Network Broadcasting Manufacturers Beijing Haite Weiye Technology Co., Ltd. is an innovative high-tech enterprise integrating product development, production, sales and after-sales service. Companies adhering to the "rigorous, efficient, innovative and perfect" entrepreneurial spirit, bold exploration, innovation, excellence, to provide our clients with first-class products and quality services. The company adheres to the business philosophy of "innovation as the soul, technology as the power, quality as the basis, and integrity as the purpose". With a rigorous work attitude, a keen market sense, a strong scientific research team and a sincere cooperative attitude, the company The industry has won a good reputation, and thus established a huge and stable customer network.
Haiteweiye has strong technical strength, advanced production equipment, rigorous management experience, and scientific working methods. It has always been adhering to the working style of "unity, innovation, hard work and high efficiency", and mainly operates the following products:
ØDigital network broadcasting, constant pressure public broadcasting, common cable FM broadcasting, wireless FM broadcasting in the public broadcasting industryØAutomatic broadcast of TV programs in the broadcast and television industry, multiplexing demodulation of TV programs, CATV closed circuit TV equipmentØSecurity and protection industry audio video matrix, Optical cable monitoring transmission, total cable monitoring transmission, network monitoring transmission Hite people believe that "attitude determines everything, details show results", we will provide you with the most generous service with "enthusiastic attitude, advanced technology, comprehensive service" We will continue to adhere to the corporate culture of "Hainan Baichuan, Zhuote extraordinary, win-win cause", with the slogan of "Honest sincerity, specialty and exquisiteness" as a spur, to provide our customers with more scientific, more mature, more perfect Products and services!