【 Weak current College 】 Conference room audio amplification system---Power By 【 China power house network 】

Conference room audio amplification system
We all know, natural sound sources (such as speeches, instruments and singing) sound energy is very limited, their sound pressure level with the range grows rapidly decay. Due to the effects of environmental noise, so that the sound source of transmission distance is reduced to a shorter. So get rid of the regular Concert Hall, Opera House and theatre, some public places can make amplification technology with electro-acoustic, sound source signal amplification and improve audience area sound pressure to ensure that every Member of the audience receive appropriate sound pressure level. In recent years, with electronic technology, the rapid development of electro-technology, sound reinforcement system for speech quality has greatly improved, on these occasions can meet people on the system sound the increasingly high demand. Public address sound system also known as professional audio systems. There is a misconception that sound reinforcement system is very simple, just put the microphone (and other sound sources), mixing console, power amplifier and speaker box connected together to form a sound reinforcement works. This understanding has led to many owners have invested a lot of money, you can get the effect of sound reinforcement is sound blurred, feedback whistling noise so that the sound does not turn up the music playback sound quality when listening to the tone of tasteless. Sound reinforcement systems is a systems engineering, electronics, electro-acoustic technology, acoustical and sound art, producing, along with the video system (multimedia projection and camera systems), the stage or dancing light system, firefighting system, paging, public address system and security system and other subsystems close cooperation and coordination. The acoustics in sound reinforcement system not only with electro-acoustic system overall performance-related, and of sound environment: Architectural Acoustics and field Tuning with closely related. Sound reinforcement system using the function and sound effects involves the correct reasonable-acoustic system design and debug, good sound propagation conditions and the correct field tuning techniques are the best fit. Electro-acoustic system like the car driving on the highway, acoustical conditions like a highway, the tuner as if the bus driver. If the vehicle's performance is necessary for safe and quick travel, highway pavement quality is balanced, an important foundation for rapid ride, the bus driver's driving skills and experience to ensure that the basic guarantee for safe driving. Three complementary to each other. Sound reinforcement system as a system problem, system design must consider all these problems. In the select a good performance on the basis of electro-acoustic devices, adopted a cohesive system design, careful system debugging and good acoustical conditions to achieve pleasant, natural sound effects. I. classification of generalized sound reinforcement system sound sound system contains sound reinforcement system and reproducing system for two broad categories: 1. sound reinforcement system: speaker and microphone at the same sound, there are sound feedback and room resonance caused screech, distortion and oscillation phenomena. To ensure system stability and uptime, the highest available system gain than acoustic feedback self-excited 6dB gain low criticality. 2. reproducing system: the system only tape drives, CD player, sound source, microphone, sound feedback may not exist, acoustic feedback coefficient is 0, which is a special case of sound reinforcement systems. According to the use of sound reinforcement sound system can be divided into the following categories: 1) outdoor sound reinforcement system outdoor sound reinforcement system is mainly used in the stadium, stations, parks, art Plaza, music fountain, etc. It is characterized by service area, the space is wide, background noise; sound travels to direct sound dominated; required sound pressure level is high, if there are buildings around the sound reflection objects such as, speaker layout nor do reasonable, Sonic, formed by multiple reflection exceeds 50ms latency above, double or multiple sound, serious problems such as echo occurs, impact sound clarity and sound like positioning. Outdoor system sound effect is also affected by weather conditions, wind direction and impact of environmental noise, etc. 2) indoor sound reinforcement system indoor sound reinforcement system is the most widely used system, including all kinds of theatre, Stadium, dance halls, etc. It professional is very strong, both non-language sound reinforcement, and for various theatrical performances, at the request of the sound quality is very high. System design should not only consider technical issues, but also audio related architectural acoustics. Room shape on the sound quality has a greater impact.
3) flow performance system sound reinforcement system apart from the fixed installation systems and mobile systems. Commonly used in a variety of large-scale venues [such as Stadium (Museum), art broadcast and large banquet hall, etc] non-theatrical use temporary installation system called mobile performance system. Mobile performance audio equipment must be compact, easy to carry, transport and installation, high reliability and can adapt to a variety of demanding environment. Large flows of investment, typically to professional audio company rental use. 4) public broadcasting system of public broadcasting system for hotels, commercial buildings, ports, airports, subway, schools provide background music and radio programs. In recent years, the public broadcasting system and make an emergency broadcast, and interactive fire alarm system. Public broadcasting system of control functions, such as broadcasting and all call selection broadcast function, forcing the switching function and the function of the priority right to broadcast, etc. Speaker load and dispersed, transmission lines long. To reduce the transmission line losses are generally set using 70V or 100V voltage high impedance transmission. Sound pressure level requirement is not high, the sound quality to baritone and treble-dominated. 5) Conference system with domestic and international exchanges have increased in recent years, teleconference, videoconference, and digital conference system (DCN) developed very rapidly. Conference system widely used in the Conference Center, hotels, and Government agencies. Conference system including the Conference discuss the system, voting systems, simultaneous translation system and telephone conference system. Requirements for audio, video (image) system synchronization, all used computer control and storing session data. 2. sound reinforcement system design sound reinforcement system design usually start from sound field, and then back to a power amplifier, sound processing systems, sound mixer, until the receiver and other sound sources. This step by step backward propulsion design steps are taken for granted. Because sound field design is to meet the system function and sound basis, it involves the selection, the speaker system for sound schemes and signaling pathway. Only determine speaker system to power amplifier driving power of calculation and determination of driving signal path, and then under the driving power distribution scheme to further determine signal processingThe selection of programmes and a mixer. Sound field design is the basis for sound reinforcement system involving system ultimate sound effects, but it is very complex and tedious task. Due to the rapid development of computer technology, now you can use the acoustic version EASE3.0 software tool to calculate the final available meet the expectations of sound field design report [1], [2]. Sound field design process may need to meet requirements in multiple times. According to the needs of the different meetings, you can configure with a vote of the meeting system or simultaneous interpretation system. In the vote, on behalf of pressing their vote on the device before, the result will be displayed on the LCD screen of the President of the machine, or by the CCU and DCN software appears in the Conference Room of the other large screen display device. Simultaneous interpretation in General at least a 1 + 3 (a native species and three being translated language) language of interpretation, unless the official representative, you can observe the additional seats. Language distribution may use a wired or wireless mode: ¨ Wired language distribution system using DCN trunk cable distribution to the participants in the meeting, the official representative of languages through received with channel selector speech equipment headset languages, delegates through the receipt channel selector on the headset to listen to the translation languages ¨ wireless language distribution system using infrared wireless transfer typical infrared system consists of an infrared transmitter, radiation, infrared personal receiver:-infrared transmitter: for each language channel to produce a carrier-infrared radiator: used to the venue distribution infrared signals.
When you install the radiator can be embedded into the wall or ceiling. The correct adjustment of the radiator installation location, you can achieve the best venue infrared signal coverage.
-Infrared receiver: up to receive 16 languages channel, with high-speed transmission channel selection function, led display, as well as features such as voice amplification.