Weak current College】 【public broadcasting system components and configuration.

<br> <br> A: general public broadcasting system constitute <br> <br> 1. audio source device <br> <br> Digital tuner <br> <br> Deck recorder, recording, etc <br> <br> .TV audio signal <br> <br> MP3, MP4 <br> <br> CD player, VCD, DVD, etc. <br> <br> Alarm signal generator <br> <br> Microphone <br> <br> 2 .. power amplification equipment <br> <br> Preamplifier, power amplifier <br> <br> Merge-power amplifier <br> <br> With five regional power amplifier <br> <br> 3, sound reduction equipment <br> < .br> Ceiling loudspeaker <br> <br> Allweather <br> <br> Other forms of Horn, etc. <br> <br> II: Advanced composition of the public broadcasting system <br> <br> 1. audio source device .<br> <br> A, digital tuning <br> <br> B, deck recorder, recording, etc <br> <br> C, TV audio signal <br> <br> MP3, MP4, <br> <br .> CD player, VCD, DVD, etc, <br> <br> Alarm signal generator <br> <br> Microphone <br> <br> 2 sources management control device <br> <br> SM-127/00 audio management .system host (language alarm, language recording microphone Extender, bells, etc) <br> <br> SM-40 host <br> <br> Dp1202 system <br> <br> SM-208 system <br> <br> 3 ., power management devices <br> <br> A, temporal power manager <br> <br> B, programming sequential Power Manager <br> <br> Power to the drive c, the alarm <br> <br> 4 power amplification .equipment <br> <br> Preamplifier, power amplifier <br> <br> Merge-power amplifier <br> <br> With five regional power amplifier (e-channel output, independent volume control) <br> <br> 5, .output management and control equipment <br> <br> A, broadcast partition selector (1-channel input, multiple output, larm) <br> <br> Matrix B, broadcast Division (2-channel input, multiple output, larm) < .br> <br> C, broadcast partition paging matrix (2-channel input, can be A, B conversion, multiple output, larm) <br> D, power amplifier failure detector (for primary and standby power amplifier automatically switches) <br .> <br> E, volume controller <br> <br> 6, sound reduction equipment <br> <br> Ceiling loudspeakers and audio posts, etc. <br> <br> III: public radio power amplifier and speakers match and calculation .methods <br> <br> 1. impedance input method <br> <br> Features and benefits: amplifier and speaker connections, through output-input impedance balanced between the power balance to achieve unity, each speaker is by and between, the concatenation .of the meeting and the amplifier output impedance and the output power of unity, so there is no other conversion devices due to join the energy loss and frequency distortion. <br> <br> Disadvantages: computing, Terminal complex, making long-distance energy .loss when you feed. <br> <br> 2, the constant pressure input method <br> <br> Features and advantages: it is between the amplifier and speaker through line transformer to connect the speaker power calculation, you can directly add up ., and all of the load are and even the way access amplifier. Convenient, connected computing can distance feed, energy loss is relatively small. <br> <br> Disadvantage: because the increased line transformer, increases the degree of energy loss, but .also poses a frequency distortion. The increase in the cost of the system. <br> <br> Four: broadcasting system's speaker installation environment and power, speaker configuration and calculation methods <br> <br> 1. Horn of installation environment to distinguish .<br> <br> Outdoor type <br> <br> Indoor type <br> <br> Indoor and outdoor hybrid <br> <br> Relatively concentrated <br> <br>-Dispersion <br> <br> 2, .divided according to environmental conditions <br> <br> Quiet environment (30db) <br> <br> General noise environment (30-60db) <br> <br> Noisy environment (more than 60db) <br> <br> 3 .. environment on Horn power and form requirement <br> <br> Outdoor quiet environment, general control every 10 square meters in 3-5W, between the use of low-power audio column and General speakers <br> <br> Outdoor General noise .environment, general control every 10 square meters in between 5-15W, use medium power allweather, directional-speakers. <br> <br> Outdoor high-noise environments, each 10 m2 general control between 10-25W, the use of high- .power tone column, directional Horn-speakers. <br> <br> Indoor high-noise environments, such as waiting rooms, exhibition halls and other establishments, refer to outdoor noise environment to consider the general power. <br> <br> Indoor .quiet environment, such as a library, classrooms, meeting rooms, hotels, etc., may reference standard in outdoor quiet environment on the basis of calculation by 80%. <br> <br> 4. how to determine the total power amplifier. .<br> <br> Calculation of total power amplifier, speakers, on the basis of the total power increase 15-20% of the total power amplifier. <br> <br> 5, put the machine and load matching whether contact when the .measurement methods and operations Essentials <br> <br> In the add-in loads less than amplifier rated load situations use considerations. (At this point the output value is greater than the rated U and I is less than the rated value) <br .> <br> In the external load is greater than the amplifier's rated load cases use considerations. (At this point the output U is less than the rated value I is greater than the nominal value) <br> <br> In the external loadEqual .to the amplifier's rated load cases use considerations. (At this point, I have U output equal to the nominal value) <br> <br> 6, public broadcasting equipment and important match devices - line transformer <br> <br> Line transformer .to use connection methods and considerations. <br> <br> 7, amplifier with adjustable in operation methods and considerations <br> <br> Volume control adjustment potentiometer. <br> <br> Tone control potentiometer adjustment method. <br> < .br> Regulation whether excessive judgment method. <br> <br>.