What are the brands of public address system?

Public address system belongs to a branch of public address system, which is also called professional sound system, and involves fringe science such as electroacoustic, architectural sound and musical sound. Therefore, the final effect of public address system involves the reasonable and correct design and debugging of electro-acoustic system, good sound propagation environment (sound construction conditions) and accurate on-site tuning, which complement each other and are indispensable. Directory Public Broadcasting Providers * * * Overview of broadcasting system classification: Public broadcasting systems can be divided into the following categories according to their uses: the composition of broadcasting sound system, program source equipment, signal amplifier and processing equipment transmission line, public broadcasting engineering system design process, users' demand for public broadcasting, and public broadcasting equipment selection. Our selection principles are as follows: public broadcasting system classification, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting, public broadcasting institutions * * * Overview of broadcasting system classification: public broadcasting systems can be divided into the following categories according to their purposes. The broadcast sound system consists of program source equipment, signal amplifier and processing equipment transmission line. The design process of public * * * broadcasting engineering system and the user's demand for public * * * broadcasting equipment selection are as follows: classification and editing of public * * * broadcasting system. Radio providers CEOPA, ABK/ Obike Gao Teng, OBT DSPPA, Dipper, ITC BDXPA, Big Dipper INTLPA, OTEWA, etc. Editor's Note: As a system problem, public broadcasting must be considered comprehensively in system design. On the basis of selective electro-acoustic equipment, through careful system design, careful system debugging and good sound construction conditions, the pleasant and natural sound effect has been achieved. Classification of broadcasting system: Broadly speaking, broadcasting system includes two categories: sound reinforcement system and sound reproduction system: 1. Sound reinforcement system: The loudspeaker and microphone are in the same sound field, and there are howling, distortion and oscillation phenomena caused by acoustic feedback and room vibration. In order to ensure the stability and normal operation of the system, the maximum available system gain is 6dB lower than the critical gain of acoustic feedback self-excitation. 2. Sound reproduction system: There are only sound sources such as tape drives and CD players in the system, and there is no microphone, so there is no possibility of sound feedback. The acoustic feedback coefficient is 0, which is a special case of broadcasting system. According to the purpose, the public address system can be divided into the following categories. (1) The outdoor broadcasting system is mainly used in stadiums, stations, parks, art squares, music fountains, etc. It is characterized by large service area and wide space. Large background noise; Sound propagation is mainly in direct sound; The required sound pressure level is very high. If there are reflectors such as high-rise buildings around, and the loudspeaker layout is unreasonable, the sound wave will be delayed for more than 50ms after repeated reflection, resulting in double or multiple sounds, and in severe cases, there will be problems such as echo, which will affect the sound clarity and audio-visual positioning. The acoustic effect of outdoor system is also affected by climatic conditions, wind direction and environmental interference. 2) Indoor broadcasting system Indoor broadcasting system is the most widely used system, including all kinds of theaters, gymnasiums and dance halls. Very professional, it can be used for non-verbal sound reinforcement and various cultural performances, and it requires high sound quality. System design should not only consider electroacoustic technology, but also involve architectural acoustics. Factors such as the shape of the room have a great influence on the sound quality. 3) Public Broadcasting System The public broadcasting system provides background music and radio programs for hotels, commercial buildings, ports, airports, subways and schools. In recent years, the public address system also doubles as an emergency broadcast, which can be linked with the fire alarm system. Public address system has many control functions. For example, the functions of constituency broadcasting and full-call broadcasting, forced power exchange and priority broadcasting rights. Speakers have many scattered loads and long transmission lines. In order to reduce the transmission line loss, 70V or 100V constant voltage and high impedance transmission is generally adopted. The sound pressure requirement is not high, and the sound quality is mainly alto and treble. 4) Conference System With the increase of domestic and international communication, telephone conference, video conference and digital conference system (DCN) have developed rapidly in recent years. Conference system is widely used in conference centers, hotels, organizations and government agencies. Conference system includes conference discussion system, voting system, simultaneous interpretation system and video conference system. Audio and video (image) systems should be synchronized, and all meeting materials should be controlled and stored by computer. Edit the characteristics of this broadcast system. Back ground music is abbreviated as BGM, which is the abbreviation of background music. Its main function is to cover up the noise and create a relaxed and harmonious atmosphere. If the listener doesn't pay attention, he can't tell the location of the sound source, and the volume is low. It is a kind of music that creates a relaxed and pleasant environment. Therefore, background music has two functions, one is to cover up the environmental noise psychologically, and the other is to create an atmosphere suitable for indoor environment. Widely used in hotels, restaurants, shopping malls, hospitals, office buildings and so on. Edit the composition of the broadcast sound system in this paragraph No matter what kind of broadcast sound system, it can basically be divided into four parts: program equipment, signal amplification processing equipment, transmission line and speaker system. Program source equipment Program source equipment: Program sources are usually provided by radio broadcasts, CD players and recording stands, as well as microphones and electronic musical instruments. Signal amplifier and processing equipment signal amplifier and processing equipment: including equalizer, preamplifier, power amplifier, various controllers and audio processing equipment, etc. The primary task of this part of equipment is signal amplification, followed by signal selection. The function and position of mixer and preamplifier are similar (of course, the function and performance index of mixer are higher). Their basic functions are signal selection and pre-amplification, and at the same time, they can adjust and control the volume and sound effects. Sometimes, for better frequency equalization and timbre beautification, a graphic equalizer will be put into use separately. This part is the "control center" of the whole broadcast sound system. The power amplifier amplifies the signal from the preamplifier or mixer, and then drives the speaker to sound through the transmission line. Transmission line transmission line: Although the transmission line is simple, the requirements are different with different systems and transmission methods. Used in auditorium, theater, etc. Due to the short distance between the power amplifier and the speaker, the direct feed mode with low resistance and high current is generally adopted, and the transmission line needs special speaker lines. But for public broadcasting system, in order to reduce the loss caused by transmission line, high voltage transmission mode is often adopted, and the transmission current is small, so the requirements for transmission line are not high. Speaker system: the speaker system needs the matching of the whole system, and its position selection should be practical. Auditorium, theater, ballroom timbre, speakers generally use high-power speakers; In public address system, 3W-6W suspended ceiling speakers are generally used because the requirements for timbre are not high. In this section, edit the design process of public broadcasting engineering system. The design of public address system usually starts from the sound field (that is, the placement position of speakers), and then advances backward to the sound sources such as power amplifier, sound processing system, mixer and microphone. This gradually backward design step is very inevitable. Because sound field design is the basis of satisfying system function and acoustic effect, it involves the selection of speaker system, sound supply scheme and signal path. Only when the loudspeaker system is determined, can the driving power of the power amplifier be calculated and the driving signal path be determined, and then the signal processing scheme and the choice of mixer can be further determined according to the driving power distribution scheme. Editing this paragraph User's Demand for Public Broadcasting With the rapid development of science and technology, users' demand for new technology applications is increasing day by day. More importantly, it provides technologies and new products that meet the needs of customers. The traditional public address system can no longer meet the requirements of users and the growth space of sales in many aspects. Factory public broadcasting is also acceptable. Digital public broadcasting system has become the mainstream of broadcasting development. Digital public broadcasting system makes full use of digital technology, which makes the user's operation more intuitive and simple, the system configuration more flexible and the function more powerful. Therefore, it is necessary to update the public broadcasting system to a digital system, which can solve the problems that the traditional public broadcasting system can't solve more intuitively, effectively and conveniently. Editing the selection of public broadcasting equipment in this section and designing a good public broadcasting system should be redesigned by professional and technical personnel according to the architectural characteristics and the specific equipment selected by investors. When choosing equipment, investors should try to choose equipment with stable performance and long service life according to the capital situation. Designers will analyze and compare factors such as quality, price, after-sales service and comprehensive strength of manufacturers according to the characteristics of public broadcasting products in the market, and finally choose the most suitable public broadcasting brand for customers. When editing this paragraph, our selection principles are: 1, scientific, accurate and advanced system design: when designing the public address system, ensure that the acoustic technical indicators of these venues meet the requirements specified in the bidding documents, so as to make the sound system design of each venue scientific, accurate and advanced. 2. Systematization and practicability of meeting functional requirements: In the equipment configuration of public address system, we guarantee 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 codes, and be easy to implement and operate. The equipment used in the public address system are all advanced products of well-known manufacturers at home and abroad. The equipment indexes meet the requirements and are consistent and interchangeable, which makes the system have good flexibility, compatibility, expansibility and portability. 3. Equipment reliability and service guarantee: the main equipment in our public address system are products of well-known brands, and Teanma professional products have been successfully applied all over China and won high praise for their high reliability and excellent performance; At the same time, TEAMA professional products promise that all users will enjoy a national two-year free warranty, and establish a perfect technical service network throughout the country to provide customers with timely and effective services. 4. Economy of system configuration: We always follow the principle that the performance-price ratio of the equipment selected by the public address system is the best, so as to ensure that the configuration of the public address system is highly economical and practical. Edit the classification of public address system in this paragraph. The public broadcasting system of modern buildings can be divided into the following three types according to the building scale, nature of use and functional requirements: (1) commercial broadcasting system (2) service broadcasting system (3) fire accident broadcasting system (1). Business broadcasting system office buildings, commercial office buildings, schools, hospitals, railway passenger stations, airports, stations, banks and factories are all equipped with business broadcasting to meet the needs of business and administration. 2. Service broadcasting system Service broadcasting is set in hotels, hotels, shopping malls, entertainment facilities and large public places. The scope of service broadcasting is background music and room program broadcasting, aiming at providing people with appreciation music broadcasting programs with service as the main purpose. Hotels and other places generally choose four sets of service radio programs. The content arrangement of radio programs should be based on the service target and engineering level. 3. The fire accident broadcasting system is mainly used to guide people to evacuate from dangerous places quickly through fire accident broadcasting in case of fire.