Public-addresssystem

1、最新资料推荐Public-address systemPublic-address system Sound reinforcement sound system can be divided into the following categories according to their use: 1) outdoor sound reinforcement system The outdoor sound reinforcement system is mainly used in stadiums, stations, parks, art squares, music fountain

2、s, etc. It is characteristic of the service area of the large, broad space and high background noise; sound propagation to direct sound; sound pressure level requirements are high, if there are other objects around the edifice of sound reflection, the speaker layout is not reasonable, sound waves by

3、 multiple reflections formed more than 50msof the delay will cause double or multiple sound sound, there will be serious problems such as echo, sound clarity and sound image localization. The sound effects of outdoor systems are also affected by climatic conditions, wind direction and environmental

4、interference. 2) indoor sound reinforcement system Indoor sound reinforcement system is the most widely used system, including all kinds of theaters, stadiums, dance halls and so on. Its professionalism is very strong, both non voice reinforcement, but also for all types of theatrical performances,

5、the quality of sound requirements.1 / 5The system design should consider not only electroacoustic technology, but also architectural acoustics. The shape of the room and other factors have a greater impact on the quality of sound. 3) mobile performance system In addition to the fixed installation sy

6、stem, the sound reinforcement system also has a flow system. Often used in various large venues (such as stadiums (museums), art broadcasting and large banquet halls, etc.) non theatrical performances, temporary installation of the system called mobile performance system. The sound equipment for mob

7、ile performances must be compact, easy to carry, transport and install, reliable, and able to adapt to harsh environments. Large mobile systems invest heavily and are usually leased to professional audio companies. 4) public address system The public address system provides background music and radi

8、o programs for hotels, commercial buildings, ports, airports, subways and schools. In recent years, the public address system has also made an emergency broadcast, which can be linked with the fire alarm system. The public broadcasting system has many control functions, such as constituency broadcas

9、t and full call broadcasting function, mandatory switching function and priority broadcasting right function, etc. The speaker load is manyand dispersed, and the最新资料推荐transmission line is long. In order to reduce transmission line loss, 70V or 100V constant voltage and high impedance transmission ar

10、e usually adopted. The sound pressure level isnot high, and the tenor is mainly Alto and treble. 5) conference system With the increasing of domestic and international exchanges, telephone conference, videophone conference and digital conference system (DCN) have been developing very fast in recent

11、years. Conference systems are widely used in conference centers, hotels, groups and government offices. The conference system includes conference discussion system, voting system, simultaneous interpretation system and videophone conference system. Require audio, video (image) system synchronization

12、, the use of computer control and storage of conference data. Two、design of sound reinforcement system Sound reinforcement system design usually starts from the sound field and then goes back to the power amplifier, the sound processing system, the console, and the microphone and other sound sources

13、. This step-by-step, backward design step is quite necessary. Because the sound field design is the basis of the system function and acoustics effect, it involves the selection of the speakersystem, the sound supply schemeand the signal path. Only when the speaker system to determine the power ampli

14、fier calculation of driving power and driving signal pathways, then according to the distribution scheme of driving power to further determine the schemeof signal processing and mixer selection. Sound field design is the foundation of sound reinforcement system, involving the final sound effect of t

15、he system, but it is also very complex and tedious work. Because of the rapid development of computer technology, now more than EASE3.0 version of the acoustic software tools can be used to calculate, and finally can meet the desired requirements of the sound field design reports 1, 2. The design pr

16、ocess of the sound field may need to be repeated many times to meet the requirements.A voting conference system or simultaneous interpretation system can be configured according to the needs of different meetings. On the vote, the representative simply presses the voting key on the device in front o

17、f him, and the voting result will be disp layed on the LCDscreen of the chairman ' s machine, or displayed on the other large screen display devices in the conference room by meansof CCUand DCNsoftware. Simultaneous interpretation uses at least 1+3 (one mother language and three translated langu

18、ages) language translation, in addition to the最新资料推荐official representative, but also according to the needs of additional audit seats. Language distribution can be wired or wireless: The language use and distribution of cable trunk cable DCN system to the conference participants assigned the translation of languages, formally represented by a speech receiving channel selector device on a headset translation, delegates received through the channel selector on headset translation The wireless distribution system to achieve language using infrared wireless transmission A