Sanmenxia where to sell the campus radio stores total broadcasting system belongs to a branch of the PA sound system, sound reinforcement professional audio sound system, also known as the edge of the three disciplines of the electro-acoustic, build sound and music system science. The ultimate effect of the public broadcasting system involves reasonable, correct electro-acoustic system design and debugging, good sound propagation environment (build sound condition) and accurate on-site tuning the three best combination of three complementary indispensable. Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Zheng * City Market Milan Sunshine Building 2, Unit 208 public broadcasting as a problem in the system design must be comprehensive consideration of the above issues. Electro-acoustic devices based on the choice of performance good, through careful system design, careful system debug and build sound condition, up to call the sound of sweet natural acoustics. The broadcast system: a generalized broadcasting system contains the PA system and burst into the system of two categories: 1, the PA system: a speaker and a microphone in the same cry venue, howling caused by the presence of acoustic feedback and room resonance, distortion and oscillation phenomenon. To ensure system stability and uptime, the highest available system gain low self-excitation threshold gain 6dB than occurred acoustic feedback. 2, burst into the system: the system only tape drives, CD-ROM drive sound source, without a microphone, there is no possibility of acoustic feedback, acoustic feedback coefficient is 0, a special case of the broadcasting system. Public Broadcasting System uses can be divided into the following categories: Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Milan sun, Zheng * City Market Building 5, Unit 2, 2081) outdoor broadcasting system. Outside broadcast The system is mainly used for stadiums, railway stations, parks, arts plaza, musical fountain. It is characterized by the service area is large, a wide space. Background noise; sound propagation to direct sound; requirements SPL speaker layout is not reasonable if the surrounding high-rise buildings and other reflective objects, sound waves via the formation of more than 50ms delay multiple reflections can cause dual the acoustic or multiple sound, serious echo problem affect the clarity of the sound and audio-visual positioning. The acoustics of the outdoor system is also affected by the impact of climatic conditions, wind direction, and environmental interference. Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Milan sun, Zheng * City Market Building 5, Unit 2, 2082) the indoor broadcasting system indoor broadcasting system is the most widely used system, including all kinds of theaters, Stadium, and dance halls. Its highly professional, both non-verbal reinforcement, but also for the use of various types of theatrical performances, high sound quality, the system design should not only consider the technical problems of the electro-acoustic, also involving architectural acoustics problems. The shape of the room, other factors have a greater impact on the sound quality. 3) The public address system: Public broadcasting system for hotels, commercial buildings, ports, airports, subways, schools provide background music and radio programs. In recent years, the public broadcasting system also cater to emergency broadcast linkage with the fire alarm system. More control functions of the public broadcasting system. Constituency broadcast call the broadcast function, forcing the power to change the function and priority functions of broadcasting rights. The speaker loads more scattered, long transmission line. Are generally used to reduce transmission line losses, 70V or 100V constant voltage high impedance transportation. Sound pressure less demanding sound quality midrange and alt. 4) conferencing systems Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Milan sun, Zheng * City Market Building 5, Unit 2, 208