Weak current College】 【public broadcast system design and installation tips.

<br> Public broadcasting system is a sound sound system in a branch, but sound amplifying sound system also known as professional audio systems involve acoustical sound, and music of three interdisciplinary science disciplines. So the public broadcasting system <br> Final results relate to .reasonable, right-acoustic system design and debug, good sound propagation environment (acoustical conditions) and the precise spot tuned combination of the three best, are complementary to each other. <br> <br> Public broadcasting as a system, integrated in the .design must consider a variety of factors impact on the system. Therefore, you should select performance excellent electro-acoustic devices, adopted on the basis of careful design of the system, Tsai <br> The thin system debugging and good acoustical conditions, to achieve .the electro-acoustic musical, natural sound effects. The following small series of finishing some public broadcasting system and the emergency broadcast system design and installation tips, and everyone <br> To share: <br> <br> Public broadcasting system design tips: .<br> <br> ⑴ transmission mode: System output power feed delivered by cable way. <br> <br> ⑵ on line attenuation requirements: in the public broadcasting system, from the output of the amplifier unit to line up of speakers of .the line between user attenuation should meet the following requirements: <br> <br> · Business broadcasting should not exceed 2 DB (1kHz) <br> <br> · Services of broadcasting should not be greater than 1 DB (1kHz) <br .> <br> ⑶ adopts constant pressure output of feed line, the output voltage by 70V or 100V. <br> <br> ⑷ power amplifiers of capacity calculation method: <br> <br> The business of broadcasting systems and operations of the .broadcasting system of calculation method: P = K 1 × K 2 × Σ P o <br> <br> Type: P - power amplifier output total power (W); <br> <br> Po - Ki × Pi per .tap at maximum power when broadcasting (W); <br> <br> Pi - I tap on user devices rated capacity; <br> <br> Ki - I tap while need coefficient; <br> <br> Service broadcasting ., the rooms show each fetch 0.2-0.4 Ki; <br> <br> Background music by 0.7-0.8 Ki <br> <br> K1 - line attenuation compensation coefficient: line attenuation while taking 1.26 1dB; line attenuation 2dB from 1.58 .; when <br> <br> K2 - aging factor, generally take 1.2-1.4; <br> <br> · Fire broadcasting system of calculation method: the system of calculation method has the following two ways: <br> <br .> A. power amplifier capacity on the system speaker 1.3 times. <br> <br> B. power amplifier capacity on the system of maximum 3 layer speaker 1.5 times. <br> <br> ⑸ standby power amplifier <br> <br .> Public broadcasting system of the power amplifier should be set back up power amplifiers, power amplifiers in work power amplifier failure can automatically or manually put into use. For important radio power amplifier (<br> As fire radio power amplifier), its standby power .amplifier should be can't work amplifier failure automatically put to use immediately. The number of standby power amplifier should be important broadcasting capacity load <br> Determine. <br> <br> ⑹ Speaker settings <br> <br> · In offices ., living rooms, changing rooms, and other Office settings 3W speakers box. <br> <br> · Floor corridor generally use ceiling loudspeaker, speaker of the spacing by storey (ceiling height) 2.5 times. Choose 3-5W ceiling speakers. < .br> <br> · Hall, conference room, restaurant, retail shopping, entertainment venues and other places to put 3-6W speaker box. <br> <br> · Room bedside control cabinet 1W-2W speakers. <br> <br .> · In building decoration and room height allows for large space of the use of sound column or combination of speakers. <br> <br> · Noise is high, the humid place setting speaker, Horn speakers should be used. In places where noise .high the Horn speaker sound pressure level than the environment 10-15dB noise. <br> <br> <br> ⑺ broadcasting system power requirements <br> <br> · Small-capacity radio can supply power directly from the socket; capacity above .the 500W, sets the broadcast control room, its power can be used by the nearest power controller-dedicated power supply. <br> <br> · AC voltage offset value is greater than + General 10%, when the voltage offset does not meet .the requirements of the device limitations, you should install the equipment near automatic voltage regulator unit. <br> <br> · Broadcast AC power supply capacity is generally final broadcasting equipment AC power consumption capacity 1.5-2 times. <br> <br> .· Fire radio equipment using fire power. <br> <br> ⑻ transmission cable choice <br> <br> · Room service of broadcasting channels use copper conductor multi-core cables or copper conductor stranded wire plastic. <br> <br> .· Other broadcasting channels use copper conductor stranded wire plastic. <br> <br> · Various programs should use shielded signal cable. <br> <br> · Fire broadcasting channels should be used for flame retardant copper conductor cable or fire resistance of copper .wire and cable. <br> <br> ⑼ line laying <br> <br> · Lines used to wear steel pipe or cable laying, and lighting, power line and cable laying. <br> <br> · Fire broadcasting line fire .protection measures should be taken. <br> <br> Emergency broadcast system design tips: <br> <br> ⑴ fire radio speaker settings should meet the following requirements: <br> <br> · Emergency broadcast speaker settings in the corridors, .halls, restaurants and other public places, the number should be able to guarantee any part from the floor to the most recent one speaker in walking distance of no more than 25 meters. The intersection in the aisle <br>, The corner should set speakers .. Aisle at the end of the lastA cry from the wall is not more than 12 metres. Each speaker rated power should not be less than 3W. <br> <br> · In-room speakers power should not be less than 1W. < .br> <br> · In-room air conditioning rooms, ventilation, laundry room, recreational facilities and garages are available for background noise such as speakers, plays in its range of playback sound pressure level should be higher than the background noise, 15dB < .br> Identify the speaker's power. <br> <br> ⑵ fire broadcasting should not be greater than 100V voltage feeder. Each floor of the feeder isolation voltage regulator to ensure that when any of the tap has a fault, should not affect other tap .of a normal radio. <br> <br> ⑶ fire broadcasting output branch should be evacuated sequence control, playback evacuation instructions floor control procedures are as follows: <br> <br> · N-tier and n-tier or above the floors .of a fire, you should connect the fire floor is adjacent to and below. <br> <br> · First floor there is a fire, you should reach this layer, layer 2 and underground floors. <br> <br> · Basement .there is a fire, you should connect the underground floors and first floor. <br> <br> ⑷ fire broadcasting and service broadcasting or operational radio combination, should meet the following requirements: <br> <br> · Fire should be able to .fire control room will fire evacuation floor speakers and amplifier forced to fire the broadcasting State. <br> <br> · Fire control rooms should be able to monitor fire radio power amplifier for operation. <br> <br> · Room bedside cabinet within .the speaker, shall have the fire broadcasting function. <br> <br> · If fire broadcasting and service broadcasting or operational radio and speaker with volume switch, the system should be used in third-line wiring cables forced open the fire so broadcasts. .<br> <br> <br>.